#################################################################################
# The Institute for the Design of Advanced Energy Systems Integrated Platform
# Framework (IDAES IP) was produced under the DOE Institute for the
# Design of Advanced Energy Systems (IDAES).
#
# Copyright (c) 2018-2024 by the software owners: The Regents of the
# University of California, through Lawrence Berkeley National Laboratory,
# National Technology & Engineering Solutions of Sandia, LLC, Carnegie Mellon
# University, West Virginia University Research Corporation, et al.
# All rights reserved. Please see the files COPYRIGHT.md and LICENSE.md
# for full copyright and license information.
#################################################################################
"""
IDAES Moving Bed Model.
The moving bed model is a 1D axially discretized model with a gas and
solid phase and a counter-current flow direction. The model captures
the gas-solid interaction between both phases through reaction, mass
and heat transfer.
Equations written in this model were derived from:
(1) A. Ostace, A. Lee, C.O. Okoli, A.P. Burgard, D.C. Miller, D. Bhattacharyya,
Mathematical modeling of a moving-bed reactor for chemical looping combustion
of methane, in: M.R. Eden, M. Ierapetritou, G.P. Towler (Eds.),13th Int. Symp.
Process Syst. Eng. (PSE 2018), Computer-Aided Chemical Engineering 2018,
pp. 325–330 , San Diego, CA.
(2) C.O. Okoli, A. Ostace, S. Nadgouda, A. Lee, A. Tong, A.P. Burgard,
D. Bhattacharyya, D.C. Miller, 2020.
A framework for the optimization of chemical looping combustion processes,
Journal of Powder Technology, Vol. 365, pp 149 - 162.
Assumptions:
Property package contains temperature and pressure variables.
Property package contains minimum fluidization velocity.
"""
# Import Python libraries
import matplotlib.pyplot as plt
# Import Pyomo libraries
from pyomo.environ import (
Var,
Param,
Reals,
value,
TransformationFactory,
Constraint,
check_optimal_termination,
units as pyunits,
)
from pyomo.common.config import ConfigBlock, ConfigValue, In, Bool
from pyomo.util.calc_var_value import calculate_variable_from_constraint
from pyomo.dae import ContinuousSet
# Import IDAES cores
from idaes.core import (
ControlVolume1DBlock,
UnitModelBlockData,
declare_process_block_class,
MaterialBalanceType,
EnergyBalanceType,
MomentumBalanceType,
FlowDirection,
DistributedVars,
)
from idaes.core.util.config import (
is_physical_parameter_block,
is_reaction_parameter_block,
)
from idaes.core.util.exceptions import (
ConfigurationError,
BurntToast,
InitializationError,
)
from idaes.core.util.tables import create_stream_table_dataframe
from idaes.core.util.constants import Constants as constants
from idaes.core.util.math import smooth_abs
from idaes.core.util.misc import add_object_reference
import idaes.logger as idaeslog
from idaes.core.util import scaling as iscale
from idaes.core.solvers import get_solver
__author__ = "Chinedu Okoli", "Anca Ostace"
# Set up logger
_log = idaeslog.getLogger(__name__)
[docs]
@declare_process_block_class("MBR")
class MBRData(UnitModelBlockData):
"""Standard Moving Bed Unit Model Class."""
# Create template for unit level config arguments
CONFIG = UnitModelBlockData.CONFIG()
# Unit level config arguments
CONFIG.declare(
"finite_elements",
ConfigValue(
default=10,
domain=int,
description="Number of finite elements length domain",
doc="""Number of finite elements to use when discretizing length
domain (default=20)""",
),
)
CONFIG.declare(
"length_domain_set",
ConfigValue(
default=[0.0, 1.0],
domain=list,
description="Number of finite elements length domain",
doc="""length_domain_set - (optional) list of point to use to
initialize a new ContinuousSet if length_domain is not
provided (default = [0.0, 1.0])""",
),
)
CONFIG.declare(
"transformation_method",
ConfigValue(
default="dae.finite_difference",
description="Method to use for DAE transformation",
doc="""Method to use to transform domain. Must be a method recognized
by the Pyomo TransformationFactory,
**default** - "dae.finite_difference".
**Valid values:** {
**"dae.finite_difference"** - Use a finite difference transformation method,
**"dae.collocation"** - use a collocation transformation method}""",
),
)
CONFIG.declare(
"transformation_scheme",
ConfigValue(
default=None,
domain=In([None, "BACKWARD", "FORWARD", "LAGRANGE-RADAU"]),
description="Scheme to use for DAE transformation",
doc="""Scheme to use when transforming domain. If specified,
this scheme is applied to discretizations in both the gas and solid phases.
In this case, ``gas_transformation_scheme`` and ``solid_transformation_scheme``
cannot be specified. See Pyomo documentation for supported schemes.
**default** - None.
**Valid values:** {
**None** - defaults to "BACKWARD" for finite difference transformation method,
and to "LAGRANGE-RADAU" for collocation transformation method,
**"BACKWARD"** - Use a finite difference transformation method,
**"FORWARD""** - use a finite difference transformation method,
**"LAGRANGE-RADAU""** - use a collocation transformation method}""",
),
)
CONFIG.declare(
"gas_transformation_scheme",
ConfigValue(
default=None,
domain=In([None, "BACKWARD", "FORWARD"]),
description="Scheme to use for DAE transformation",
doc="""Scheme to use when transforming length domain of the gas
phase. If this option is supplied, ``solid_transformation_scheme`` must be
supplied as well. This cannot be set (other than to ``None``) if the
``transformation_scheme`` option is set.
See Pyomo documentation for supported schemes.
**default** - None.
**Valid values:** {
**None** - defaults to the value of the ``transformation_scheme`` option,
**"BACKWARD"** - Use a finite difference transformation method,
**"FORWARD""** - use a finite difference transformation method}""",
),
)
CONFIG.declare(
"solid_transformation_scheme",
ConfigValue(
default=None,
domain=In([None, "BACKWARD", "FORWARD"]),
description="Scheme to use for DAE transformation",
doc="""Scheme to use when transforming length domain of the solid
phase. If this option is supplied, ``gas_transformation_scheme`` must be
supplied as well. This cannot be set (other than to ``None``) if the
``transformation_scheme`` option is set.
See Pyomo documentation for supported schemes,
**default** - None.
**Valid values:** {
**None** - defaults to the value of the ``transformation_scheme`` option,
**"BACKWARD"** - Use a finite difference transformation method,
**"FORWARD""** - use a finite difference transformation method}""",
),
)
CONFIG.declare(
"collocation_points",
ConfigValue(
default=3,
domain=int,
description="Number of collocation points per finite element",
doc="""Number of collocation points to use per finite element when
discretizing length domain (default=3)""",
),
)
CONFIG.declare(
"flow_type",
ConfigValue(
default="counter_current",
domain=In(["counter_current"]),
description="Flow configuration of Moving Bed",
doc="""Flow configuration of Moving Bed
- counter_current: gas side flows from 0 to 1
solid side flows from 1 to 0""",
),
)
CONFIG.declare(
"material_balance_type",
ConfigValue(
default=MaterialBalanceType.componentTotal,
domain=In(MaterialBalanceType),
description="Material balance construction flag",
doc="""Indicates what type of mass balance should be constructed,
**default** - MaterialBalanceType.componentTotal.
**Valid values:** {
**MaterialBalanceType.none** - exclude material balances,
**MaterialBalanceType.componentPhase** - use phase component balances,
**MaterialBalanceType.componentTotal** - use total component balances,
**MaterialBalanceType.elementTotal** - use total element balances,
**MaterialBalanceType.total** - use total material balance.}""",
),
)
CONFIG.declare(
"energy_balance_type",
ConfigValue(
default=EnergyBalanceType.enthalpyTotal,
domain=In(EnergyBalanceType),
description="Energy balance construction flag",
doc="""Indicates what type of energy balance should be constructed,
**default** - EnergyBalanceType.enthalpyTotal.
**Valid values:** {
**EnergyBalanceType.none** - exclude energy balances,
**EnergyBalanceType.enthalpyTotal** - single enthalpy balance for material,
**EnergyBalanceType.enthalpyPhase** - enthalpy balances for each phase,
**EnergyBalanceType.energyTotal** - single energy balance for material,
**EnergyBalanceType.energyPhase** - energy balances for each phase.}""",
),
)
CONFIG.declare(
"momentum_balance_type",
ConfigValue(
default=MomentumBalanceType.pressureTotal,
domain=In(MomentumBalanceType),
description="Momentum balance construction flag",
doc="""Indicates what type of momentum balance should be constructed,
**default** - MomentumBalanceType.pressureTotal.
**Valid values:** {
**MomentumBalanceType.none** - exclude momentum balances,
**MomentumBalanceType.pressureTotal** - single pressure balance for material,
**MomentumBalanceType.pressurePhase** - pressure balances for each phase,
**MomentumBalanceType.momentumTotal** - single momentum balance for material,
**MomentumBalanceType.momentumPhase** - momentum balances for each phase.}""",
),
)
CONFIG.declare(
"has_pressure_change",
ConfigValue(
default=True,
domain=Bool,
description="Pressure change term construction flag",
doc="""Indicates whether terms for pressure change should be
constructed,
**default** - False.
**Valid values:** {
**True** - include pressure change terms,
**False** - exclude pressure change terms.}""",
),
)
CONFIG.declare(
"pressure_drop_type",
ConfigValue(
default="simple_correlation",
domain=In(["simple_correlation", "ergun_correlation"]),
description="Construction flag for type of pressure drop",
doc="""Indicates what type of pressure drop correlation should be used,
**default** - "simple_correlation".
**Valid values:** {
**"simple_correlation"** - Use a simplified pressure drop correlation,
**"ergun_correlation"** - Use the Ergun equation.}""",
),
)
# Create template for phase specific config arguments
_PhaseTemplate = UnitModelBlockData.CONFIG()
_PhaseTemplate.declare(
"has_equilibrium_reactions",
ConfigValue(
default=False,
domain=Bool,
description="Equilibrium reaction construction flag",
doc="""Indicates whether terms for equilibrium controlled reactions
should be constructed,
**default** - True.
**Valid values:** {
**True** - include equilibrium reaction terms,
**False** - exclude equilibrium reaction terms.}""",
),
)
_PhaseTemplate.declare(
"property_package",
ConfigValue(
default=None,
domain=is_physical_parameter_block,
description="Property package to use for control volume",
doc="""Property parameter object used to define property calculations
(default = 'use_parent_value')
- 'use_parent_value' - get package from parent (default = None)
- a ParameterBlock object""",
),
)
_PhaseTemplate.declare(
"property_package_args",
ConfigValue(
default={},
domain=dict,
description="Arguments for constructing gas property package",
doc="""A dict of arguments to be passed to the PropertyBlockData
and used when constructing these
(default = 'use_parent_value')
- 'use_parent_value' - get package from parent (default = None)
- a dict (see property package for documentation)""",
),
)
_PhaseTemplate.declare(
"reaction_package",
ConfigValue(
default=None,
domain=is_reaction_parameter_block,
description="Reaction package to use for control volume",
doc="""Reaction parameter object used to define reaction calculations,
**default** - None.
**Valid values:** {
**None** - no reaction package,
**ReactionParameterBlock** - a ReactionParameterBlock object.}""",
),
)
_PhaseTemplate.declare(
"reaction_package_args",
ConfigBlock(
implicit=True,
implicit_domain=ConfigBlock,
description="Arguments to use for constructing reaction packages",
doc="""A ConfigBlock with arguments to be passed to a reaction block(s)
and used when constructing these,
**default** - None.
**Valid values:** {
see reaction package for documentation.}""",
),
)
# Create individual config blocks for gas and solid sides
CONFIG.declare("gas_phase_config", _PhaseTemplate(doc="gas phase config arguments"))
CONFIG.declare(
"solid_phase_config", _PhaseTemplate(doc="solid phase config arguments")
)
# =========================================================================
[docs]
def build(self):
"""
Begin building model (pre-DAE transformation).
Args:
None
Returns:
None
"""
# Call UnitModel.build to build default attributes
super().build()
# Consistency check for transformation method and transformation scheme
if (
self.config.transformation_method == "dae.finite_difference"
and self.config.transformation_scheme is None
):
self.config.transformation_scheme = "BACKWARD"
elif (
self.config.transformation_method == "dae.collocation"
and self.config.transformation_scheme is None
):
self.config.transformation_scheme = "LAGRANGE-RADAU"
elif (
self.config.transformation_method == "dae.finite_difference"
and self.config.transformation_scheme != "BACKWARD"
and self.config.transformation_scheme != "FORWARD"
):
raise ConfigurationError(
"{} invalid value for "
"transformation_scheme argument. "
"Must be "
"BACKWARD"
" or "
"FORWARD"
" "
"if transformation_method is"
" "
"dae.finite_difference"
".".format(self.name)
)
elif (
self.config.transformation_method == "dae.collocation"
and self.config.transformation_scheme != "LAGRANGE-RADAU"
):
raise ConfigurationError(
"{} invalid value for "
"transformation_scheme argument."
"Must be "
"LAGRANGE-RADAU"
" if "
"transformation_method is"
" "
"dae.collocation"
".".format(self.name)
)
elif self.config.transformation_method != "dae.finite_difference" and (
self.config.gas_transformation_scheme is not None
or self.config.solid_transformation_scheme is not None
):
raise ConfigurationError(
"Invalid configuration of {}. transformation_method must be"
' "dae.finite_difference" if gas_transformation_scheme or'
" solid_transformation_scheme are set".format(self.name)
)
elif (self.config.gas_transformation_scheme is None) != (
self.config.solid_transformation_scheme is None
):
raise ConfigurationError(
"Invalid configuration of {}. Either both"
" gas_transformation_scheme and solid_transformation_scheme"
" must be set, or neither must be set. Got {} and {}.".format(
self.name,
self.config.gas_transformation_scheme,
self.config.solid_transformation_scheme,
)
)
elif (self.config.transformation_scheme is not None) and (
(self.config.gas_transformation_scheme is not None)
or (self.config.solid_transformation_scheme is not None)
):
raise ConfigurationError(
"Invalid configuration of {}. transformation_scheme cannot be"
" specified if gas_transformation_scheme and"
" solid_transformation_scheme are specified.".format(self.name)
)
# Set flow directions for the control volume blocks
# Gas flows from 0 to 1, solid flows from 1 to 0
# An if statement is used here despite only one option to allow for
# future extensions to other flow configurations
if self.config.flow_type == "counter_current":
set_direction_gas = FlowDirection.forward
set_direction_solid = FlowDirection.backward
else:
raise BurntToast(
"{} encountered unrecognized argument "
"for flow type. Please contact the IDAES"
" developers with this bug.".format(self.name)
)
# Set arguments for gas sides if homogeneous reaction block
if self.config.gas_phase_config.reaction_package is not None:
has_rate_reaction_gas_phase = True
else:
has_rate_reaction_gas_phase = False
# Set arguments for gas and solid sides if heterogeneous reaction block
if self.config.solid_phase_config.reaction_package is not None:
has_rate_reaction_solid_phase = True
has_mass_transfer_gas_phase = True
else:
has_rate_reaction_solid_phase = False
has_mass_transfer_gas_phase = False
# Set heat transfer terms
if self.config.energy_balance_type != EnergyBalanceType.none:
has_heat_transfer = True
else:
has_heat_transfer = False
# Set heat of reaction terms
if (
self.config.energy_balance_type != EnergyBalanceType.none
and self.config.gas_phase_config.reaction_package is not None
):
has_heat_of_reaction_gas_phase = True
else:
has_heat_of_reaction_gas_phase = False
if (
self.config.energy_balance_type != EnergyBalanceType.none
and self.config.solid_phase_config.reaction_package is not None
):
has_heat_of_reaction_solid_phase = True
else:
has_heat_of_reaction_solid_phase = False
# local aliases used to shorten object names
solid_phase = self.config.solid_phase_config
# Get units meta data from property packages
units_meta_solid = solid_phase.property_package.get_metadata().get_derived_units
# In this branch, we assume that either both gas and solid
# transformation schemes are specified, or neither are specified.
if (
# solid and gas transformation schemes are specified
(self.config.solid_transformation_scheme is not None)
and (self.config.gas_transformation_scheme is not None)
):
# Create length domain sets for gas and solid phases. This is
# necessary so we can apply different discretizations to the
# different phases.
self._gas_tr_scheme = self.config.gas_transformation_scheme
self._solid_tr_scheme = self.config.solid_transformation_scheme
self.solid_length_domain = ContinuousSet(
bounds=(0.0, 1.0),
initialize=self.config.length_domain_set,
doc="Solid phase normalized length domain",
)
self.gas_length_domain = ContinuousSet(
bounds=(0.0, 1.0),
initialize=self.config.length_domain_set,
doc="Gas phase normalized length domain",
)
# Create an instance attribute "length_domain" for convenience.
# Arbitrarily, use the solid phase length domain.
#
# We do not use Reference as it does not work for Sets.
add_object_reference(self, "length_domain", self.solid_length_domain)
else:
# Neither gas nor solid transformation schemes are specified
self._gas_tr_scheme = self.config.transformation_scheme
self._solid_tr_scheme = self.config.transformation_scheme
self.length_domain = ContinuousSet(
bounds=(0.0, 1.0),
initialize=self.config.length_domain_set,
doc="Moving bed normalized length domain",
)
# Create instance attributes for gas and solid length domains
add_object_reference(self, "solid_length_domain", self.length_domain)
add_object_reference(self, "gas_length_domain", self.length_domain)
self.bed_height = Var(
domain=Reals,
initialize=1,
doc="Bed length",
units=units_meta_solid("length"),
)
# =========================================================================
# Build Control volume 1D for gas phase and populate gas control volume
self.gas_phase = ControlVolume1DBlock(
transformation_method=self.config.transformation_method,
transformation_scheme=self._gas_tr_scheme,
finite_elements=self.config.finite_elements,
collocation_points=self.config.collocation_points,
dynamic=self.config.dynamic,
has_holdup=self.config.has_holdup,
area_definition=DistributedVars.variant,
property_package=self.config.gas_phase_config.property_package,
property_package_args=self.config.gas_phase_config.property_package_args,
reaction_package=self.config.gas_phase_config.reaction_package,
reaction_package_args=self.config.gas_phase_config.reaction_package_args,
)
self.gas_phase.add_geometry(
length_domain=self.gas_length_domain,
length_domain_set=self.config.length_domain_set,
length_var=self.bed_height,
flow_direction=set_direction_gas,
)
self.gas_phase.add_state_blocks(
information_flow=set_direction_gas, has_phase_equilibrium=False
)
if self.config.gas_phase_config.reaction_package is not None:
self.gas_phase.add_reaction_blocks(
has_equilibrium=self.config.gas_phase_config.has_equilibrium_reactions
)
self.gas_phase.add_material_balances(
balance_type=self.config.material_balance_type,
has_phase_equilibrium=False,
has_mass_transfer=has_mass_transfer_gas_phase,
has_rate_reactions=has_rate_reaction_gas_phase,
)
self.gas_phase.add_energy_balances(
balance_type=self.config.energy_balance_type,
has_heat_transfer=has_heat_transfer,
has_heat_of_reaction=has_heat_of_reaction_gas_phase,
)
self.gas_phase.add_momentum_balances(
balance_type=self.config.momentum_balance_type,
has_pressure_change=self.config.has_pressure_change,
)
# =========================================================================
# Build Control volume 1D for solid phase and populate solid control volume
# Set argument for heterogeneous reaction block
self.solid_phase = ControlVolume1DBlock(
transformation_method=self.config.transformation_method,
transformation_scheme=self._solid_tr_scheme,
finite_elements=self.config.finite_elements,
collocation_points=self.config.collocation_points,
dynamic=self.config.dynamic,
has_holdup=self.config.has_holdup,
area_definition=DistributedVars.variant,
property_package=self.config.solid_phase_config.property_package,
property_package_args=self.config.solid_phase_config.property_package_args,
reaction_package=self.config.solid_phase_config.reaction_package,
reaction_package_args=self.config.solid_phase_config.reaction_package_args,
)
self.solid_phase.add_geometry(
length_domain=self.solid_length_domain,
length_domain_set=self.config.length_domain_set,
length_var=self.bed_height,
flow_direction=set_direction_solid,
)
self.solid_phase.add_state_blocks(
information_flow=set_direction_solid, has_phase_equilibrium=False
)
if self.config.solid_phase_config.reaction_package is not None:
# TODO - a generalization of the heterogeneous reaction block
# The heterogeneous reaction block does not use the
# add_reaction_blocks in control volumes as control volumes are
# currently setup to handle only homogeneous reaction properties.
# Thus appending the heterogeneous reaction block to the
# solid state block is currently hard coded here.
tmp_dict = dict(**self.config.solid_phase_config.reaction_package_args)
tmp_dict["gas_state_block"] = self.gas_phase.properties
tmp_dict["solid_state_block"] = self.solid_phase.properties
tmp_dict["has_equilibrium"] = (
self.config.solid_phase_config.has_equilibrium_reactions
)
tmp_dict["parameters"] = self.config.solid_phase_config.reaction_package
self.solid_phase.reactions = (
self.config.solid_phase_config.reaction_package.reaction_block_class(
self.flowsheet().time,
self.length_domain,
doc="Reaction properties in control volume",
**tmp_dict,
)
)
self.solid_phase.add_material_balances(
balance_type=self.config.material_balance_type,
has_phase_equilibrium=False,
has_mass_transfer=False,
has_rate_reactions=has_rate_reaction_solid_phase,
)
self.solid_phase.add_energy_balances(
balance_type=self.config.energy_balance_type,
has_heat_transfer=has_heat_transfer,
has_heat_of_reaction=has_heat_of_reaction_solid_phase,
)
self.solid_phase.add_momentum_balances(
balance_type=MomentumBalanceType.none, has_pressure_change=False
)
# =========================================================================
# Add ports
# Add Ports for gas side
self.add_inlet_port(name="gas_inlet", block=self.gas_phase)
self.add_outlet_port(name="gas_outlet", block=self.gas_phase)
# Add Ports for solid side
self.add_inlet_port(name="solid_inlet", block=self.solid_phase)
self.add_outlet_port(name="solid_outlet", block=self.solid_phase)
# =========================================================================
# Add performance equation method
self._apply_transformation()
self._make_performance()
# =========================================================================
def _apply_transformation(self):
"""
Method to apply DAE transformation to the Control Volume length domain.
Transformation applied will be based on the Control Volume
configuration arguments.
"""
if self.config.finite_elements is None:
raise ConfigurationError(
"{} was not provided a value for the finite_elements"
" configuration argument. Please provide a valid value.".format(
self.name
)
)
if self.config.transformation_method == "dae.finite_difference":
self.discretizer = TransformationFactory(self.config.transformation_method)
if (self.config.gas_transformation_scheme is not None) and (
self.config.solid_transformation_scheme is not None
):
self.discretizer.apply_to(
self,
wrt=self.gas_length_domain,
nfe=self.config.finite_elements,
scheme=self._gas_tr_scheme,
)
self.discretizer.apply_to(
self,
wrt=self.solid_length_domain,
nfe=self.config.finite_elements,
scheme=self._solid_tr_scheme,
)
else:
self.discretizer.apply_to(
self,
wrt=self.length_domain,
nfe=self.config.finite_elements,
scheme=self.config.transformation_scheme,
)
elif self.config.transformation_method == "dae.collocation":
self.discretizer = TransformationFactory(self.config.transformation_method)
self.discretizer.apply_to(
self,
wrt=self.length_domain,
nfe=self.config.finite_elements,
ncp=self.config.collocation_points,
scheme=self.config.transformation_scheme,
)
def _make_performance(self):
"""
Constraints for unit model.
Args:
None
Returns:
None
"""
# local aliases used to shorten object names
gas_phase = self.config.gas_phase_config
solid_phase = self.config.solid_phase_config
# Get units meta data from property packages
units_meta_gas = gas_phase.property_package.get_metadata().get_derived_units
units_meta_solid = solid_phase.property_package.get_metadata().get_derived_units
# Declare Mutable Parameters
self.eps = Param(
mutable=True,
default=1e-8,
doc="Smoothing Factor for Smooth IF Statements",
units=pyunits.dimensionless,
)
# Unit Model variables
self.bed_diameter = Var(
initialize=1, doc="Reactor diameter", units=units_meta_solid("length")
)
self.bed_area = Var(
domain=Reals,
initialize=1,
doc="Reactor cross-sectional area",
units=units_meta_solid("area"),
)
# Phase specific variables
self.velocity_superficial_gas = Var(
self.flowsheet().time,
self.length_domain,
domain=Reals,
initialize=0.05,
doc="Gas superficial velocity",
units=units_meta_gas("velocity"),
)
self.velocity_superficial_solid = Var(
self.flowsheet().time,
domain=Reals,
initialize=0.005,
doc="Solid superficial velocity",
units=units_meta_solid("velocity"),
)
# Dimensionless numbers, mass and heat transfer coefficients
self.Re_particle = Var(
self.flowsheet().time,
self.length_domain,
domain=Reals,
initialize=1.0,
doc="Particle Reynolds number",
units=pyunits.dimensionless,
)
self.Pr_particle = Var(
self.flowsheet().time,
self.length_domain,
domain=Reals,
initialize=1.0,
doc="Prandtl number of gas in bed",
units=pyunits.dimensionless,
)
self.Nu_particle = Var(
self.flowsheet().time,
self.length_domain,
domain=Reals,
initialize=1.0,
doc="Particle Nusselt number",
units=pyunits.dimensionless,
)
self.gas_solid_htc = Var(
self.flowsheet().time,
self.length_domain,
domain=Reals,
initialize=1.0,
doc="Gas-solid heat transfer coefficient",
units=units_meta_gas("heat_transfer_coefficient"),
)
# Fixed variables (these are parameters that can be estimated)
self.bed_voidage = Var(
domain=Reals, initialize=0.4, doc="Bed voidage", units=pyunits.dimensionless
)
self.bed_voidage.fix()
# =========================================================================
# Add performance equations
# ---------------------------------------------------------------------
# Geometry constraints
# Bed area
@self.Constraint(doc="Bed area")
def bed_area_eqn(b):
return b.bed_area == (constants.pi * (0.5 * b.bed_diameter) ** 2)
# Area of gas side, and solid side
@self.Constraint(self.flowsheet().time, self.length_domain, doc="Gas side area")
def gas_phase_area(b, t, x):
return (
b.gas_phase.area[t, x]
== pyunits.convert(b.bed_area, to_units=units_meta_gas("area"))
* b.bed_voidage
)
@self.Constraint(
self.flowsheet().time, self.length_domain, doc="Solid side area"
)
def solid_phase_area(b, t, x):
return b.solid_phase.area[t, x] == b.bed_area * (1 - b.bed_voidage)
# ---------------------------------------------------------------------
# Hydrodynamic constraints
# Gas superficial velocity
@self.Constraint(
self.flowsheet().time, self.length_domain, doc="Gas superficial velocity"
)
def gas_super_vel(b, t, x):
return (
b.velocity_superficial_gas[t, x]
* pyunits.convert(b.bed_area, to_units=units_meta_gas("area"))
* b.gas_phase.properties[t, x].dens_mol
== b.gas_phase.properties[t, x].flow_mol
)
# Solid superficial velocity
@self.Constraint(
self.flowsheet().time, self.length_domain, doc="Solid superficial velocity"
)
# This equation uses inlet values to compute the constant solid
# superficial velocity, and then computes the solid particle density
# through the rest of the bed.
def solid_super_vel(b, t, x):
return (
b.velocity_superficial_solid[t]
* b.bed_area
* b.solid_phase.properties[t, x].dens_mass_particle
== b.solid_phase.properties[t, x].flow_mass
)
# Gas side pressure drop calculation
if (
self.config.has_pressure_change
and self.config.pressure_drop_type == "simple_correlation"
):
# Simplified pressure drop
@self.Constraint(
self.flowsheet().time,
self.length_domain,
doc="Gas side pressure drop calculation -" "simplified pressure drop",
)
def gas_phase_config_pressure_drop(b, t, x):
# 0.2/s is a unitted constant in the correlation
return pyunits.convert(
b.gas_phase.deltaP[t, x],
to_units=units_meta_solid("pressure") / units_meta_solid("length"),
) == -(0.2 / pyunits.s) * (
b.velocity_superficial_gas[t, x]
* (
pyunits.convert(
b.solid_phase.properties[t, x].dens_mass_particle,
to_units=units_meta_solid("density_mass"),
)
- b.gas_phase.properties[t, x].dens_mass
)
)
elif (
self.config.has_pressure_change
and self.config.pressure_drop_type == "ergun_correlation"
):
# Ergun equation
@self.Constraint(
self.flowsheet().time,
self.length_domain,
doc="Gas side pressure drop calculation -" "Ergun equation",
)
def gas_phase_config_pressure_drop(b, t, x):
return -pyunits.convert(
b.gas_phase.deltaP[t, x],
to_units=units_meta_solid("pressure") / units_meta_solid("length"),
) == (
(150 * pyunits.dimensionless)
* (1 - b.bed_voidage) ** 2
* b.gas_phase.properties[t, x].visc_d
* (
b.velocity_superficial_gas[t, x]
+ pyunits.convert(
b.velocity_superficial_solid[t],
to_units=units_meta_solid("velocity"),
)
)
/ (
pyunits.convert(
b.solid_phase.properties[t, x].params.particle_dia,
to_units=units_meta_solid("length"),
)
** 2
* b.bed_voidage**3
)
) + (
(1.75 * pyunits.dimensionless)
* b.gas_phase.properties[t, x].dens_mass
* (1 - b.bed_voidage)
* (
b.velocity_superficial_gas[t, x]
+ pyunits.convert(
b.velocity_superficial_solid[t],
to_units=units_meta_solid("velocity"),
)
)
** 2
/ (
pyunits.convert(
b.solid_phase.properties[t, x].params.particle_dia,
to_units=units_meta_solid("length"),
)
* b.bed_voidage**3
)
)
# to_units=deltaP_units)
# The above expression has no absolute values - assumes:
# (velocity_superficial_gas + velocity_superficial_solid) > 0
elif self.config.has_pressure_change is False:
pass
else:
raise BurntToast(
"{} encountered unrecognized argument for "
"the pressure drop correlation. Please contact the IDAES"
" developers with this bug.".format(self.name)
)
# ---------------------------------------------------------------------
# Reaction constraints
# Build homogeneous reaction constraints
if gas_phase.reaction_package is not None:
# Gas side rate reaction extent
@self.Constraint(
self.flowsheet().time,
self.length_domain,
gas_phase.reaction_package.rate_reaction_idx,
doc="Gas side rate reaction extent",
)
def gas_phase_config_rxn_ext(b, t, x, r):
return b.gas_phase.rate_reaction_extent[t, x, r] == (
b.gas_phase.reactions[t, x].reaction_rate[r]
* b.gas_phase.area[t, x]
)
# Build heterogeneous reaction constraints
if solid_phase.reaction_package is not None:
# Solid side rate reaction extent
@self.Constraint(
self.flowsheet().time,
self.length_domain,
solid_phase.reaction_package.rate_reaction_idx,
doc="Solid side rate reaction extent",
)
def solid_phase_config_rxn_ext(b, t, x, r):
return b.solid_phase.rate_reaction_extent[t, x, r] == (
b.solid_phase.reactions[t, x].reaction_rate[r]
* b.solid_phase.area[t, x]
)
# Gas side heterogeneous rate reaction generation
@self.Constraint(
self.flowsheet().time,
self.length_domain,
gas_phase.property_package.phase_list,
gas_phase.property_package.component_list,
doc="Gas side heterogeneous" "rate reaction generation",
)
def gas_comp_hetero_rxn(b, t, x, p, j):
return b.gas_phase.mass_transfer_term[t, x, p, j] == (
sum(
b.solid_phase.reactions[t, x].rate_reaction_stoichiometry[
r, p, j
]
* b.solid_phase.reactions[t, x].reaction_rate[r]
for r in (solid_phase.reaction_package.rate_reaction_idx)
)
* b.solid_phase.area[t, x]
)
# ---------------------------------------------------------------------
if self.config.energy_balance_type != EnergyBalanceType.none:
# Solid phase - gas to solid heat transfer
@self.Constraint(
self.flowsheet().time,
self.length_domain,
doc="Solid phase - gas to solid heat transfer",
)
def solid_phase_heat_transfer(b, t, x):
return pyunits.convert(
b.solid_phase.heat[t, x],
to_units=units_meta_gas("power") / units_meta_gas("length"),
) * pyunits.convert(
b.solid_phase.properties[t, x].params.particle_dia,
to_units=units_meta_gas("length"),
) == 6 * b.gas_solid_htc[
t, x
] * (
b.gas_phase.properties[t, x].temperature
- pyunits.convert(
b.solid_phase.properties[t, x].temperature,
to_units=units_meta_gas("temperature"),
)
) * pyunits.convert(
b.solid_phase.area[t, x], to_units=units_meta_gas("area")
)
# Dimensionless numbers, mass and heat transfer coefficients
# Particle Reynolds number
@self.Constraint(
self.flowsheet().time,
self.length_domain,
doc="Particle Reynolds number",
)
def reynolds_number_particle(b, t, x):
return (
b.Re_particle[t, x] * b.gas_phase.properties[t, x].visc_d
== b.velocity_superficial_gas[t, x]
* pyunits.convert(
b.solid_phase.properties[t, x].params.particle_dia,
to_units=units_meta_gas("length"),
)
* b.gas_phase.properties[t, x].dens_mass
)
# Prandtl number
@self.Constraint(
self.flowsheet().time,
self.length_domain,
doc="Prandtl number of gas in bed",
)
def prandtl_number(b, t, x):
return (
b.Pr_particle[t, x] * b.gas_phase.properties[t, x].therm_cond
== b.gas_phase.properties[t, x].cp_mass
* b.gas_phase.properties[t, x].visc_d
)
# Particle Nusselt number
@self.Constraint(
self.flowsheet().time, self.length_domain, doc="Particle Nusselt number"
)
def nusselt_number_particle(b, t, x):
return (
b.Nu_particle[t, x] ** 3
== (
2.0 + 1.1 * (smooth_abs(b.Re_particle[t, x], b.eps) ** 0.6) ** 3
)
* b.Pr_particle[t, x]
)
# Gas-solid heat transfer coefficient
@self.Constraint(
self.flowsheet().time,
self.length_domain,
doc="Gas-solid heat transfer coefficient",
)
def gas_solid_htc_eqn(b, t, x):
return (
b.gas_solid_htc[t, x]
* pyunits.convert(
b.solid_phase.properties[t, x].params.particle_dia,
to_units=units_meta_gas("length"),
)
== b.Nu_particle[t, x] * b.gas_phase.properties[t, x].therm_cond
)
# Gas phase - gas to solid heat transfer
@self.Constraint(
self.flowsheet().time,
self.length_domain,
doc="Gas phase - gas to solid heat transfer",
)
def gas_phase_heat_transfer(b, t, x):
return b.gas_phase.heat[t, x] * pyunits.convert(
b.solid_phase.properties[t, x].params.particle_dia,
to_units=units_meta_gas("length"),
) == -6 * b.gas_solid_htc[t, x] * (
b.gas_phase.properties[t, x].temperature
- pyunits.convert(
b.solid_phase.properties[t, x].temperature,
to_units=units_meta_gas("temperature"),
)
) * pyunits.convert(
b.solid_phase.area[t, x], to_units=units_meta_gas("area")
)
elif self.config.energy_balance_type == EnergyBalanceType.none:
# If energy balance is none fix gas and solid temperatures to
# solid inlet temperature
@self.Constraint(
self.flowsheet().time,
self.length_domain,
doc="Isothermal gas phase constraint",
)
def isothermal_gas_phase(b, t, x):
if x == self.length_domain.first():
return Constraint.Skip
else:
return (
b.gas_phase.properties[t, x].temperature
== b.solid_inlet.temperature[t]
)
@self.Constraint(
self.flowsheet().time,
self.length_domain,
doc="Isothermal solid phase constraint",
)
def isothermal_solid_phase(b, t, x):
if x == self.length_domain.last():
return Constraint.Skip
else:
return (
b.solid_phase.properties[t, x].temperature
== b.solid_inlet.temperature[t]
)
# =========================================================================
# Model initialization routine
[docs]
def initialize_build(
blk,
gas_phase_state_args=None,
solid_phase_state_args=None,
outlvl=idaeslog.NOTSET,
solver=None,
optarg=None,
):
"""
Initialization routine for MB unit.
Keyword Arguments:
gas_phase_state_args : a dict of arguments to be passed to the
property package(s) to provide an initial state for
initialization (see documentation of the specific
property package) (default = None).
solid_phase_state_args : a dict of arguments to be passed to the
property package(s) to provide an initial state for
initialization (see documentation of the specific
property package) (default = None).
outlvl : sets output level of initialization routine
optarg : solver options dictionary object (default=None, use
default solver options)
solver : str indicating which solver to use during
initialization (default = None, use default solver)
Returns:
None
"""
# Set up logger for initialization and solve
init_log = idaeslog.getInitLogger(blk.name, outlvl, tag="unit")
solve_log = idaeslog.getSolveLogger(blk.name, outlvl, tag="unit")
# Create solver
opt = get_solver(solver, optarg)
# ---------------------------------------------------------------------
# local aliases used to shorten object names
gas_phase = blk.config.gas_phase_config
solid_phase = blk.config.solid_phase_config
# Keep all unit model geometry constraints, derivative_var constraints,
# and property block constraints active. Additionally, in control
# volumes - keep conservation linking constraints and
# holdup calculation (for dynamic flowsheets) constraints active
geometry_constraints_terms = [
"bed_area_eqn",
"solid_phase_area",
"gas_phase_area",
"gas_phase_length",
"solid_phase_length",
]
endswith_terms = (
"_disc_eq",
"linking_constraint",
"linking_constraints",
"_holdup_calculation",
)
startswith_terms = "properties"
for c in blk.component_objects(Constraint, descend_into=True):
if (
not c.parent_block().local_name.startswith(startswith_terms)
and not c.local_name.endswith(endswith_terms)
and c.local_name not in geometry_constraints_terms
):
c.deactivate()
# ---------------------------------------------------------------------
# Initialize thermophysical property constraints
init_log.info("Initialize Thermophysical Properties")
# Initialize gas_phase block
gas_phase_flags = blk.gas_phase.properties.initialize(
state_args=gas_phase_state_args,
outlvl=outlvl,
optarg=optarg,
solver=solver,
hold_state=True,
)
# Initialize solid_phase properties block
solid_phase_flags = blk.solid_phase.properties.initialize(
state_args=solid_phase_state_args,
outlvl=outlvl,
optarg=optarg,
solver=solver,
hold_state=True,
)
init_log.info_high("Initialization Step 1 Complete.")
# ---------------------------------------------------------------------
# Initialize hydrodynamics (gas velocity)
for t in blk.flowsheet().time:
for x in blk.length_domain:
calculate_variable_from_constraint(
blk.velocity_superficial_gas[t, x], blk.gas_super_vel[t, x]
)
blk.gas_super_vel.activate()
init_log.info("Initialize Hydrodynamics")
with idaeslog.solver_log(solve_log, idaeslog.DEBUG) as slc:
results = opt.solve(blk, tee=slc.tee)
if check_optimal_termination(results):
init_log.info_high(
"Initialization Step 2 {}.".format(idaeslog.condition(results))
)
else:
_log.warning("{} Initialization Step 2 Failed.".format(blk.name))
# ---------------------------------------------------------------------
# Initialize mass balance - no reaction and no pressure drop
# Unfix material balance state variables (including particle porosity)
# but keep other states fixed
blk.gas_phase.properties.release_state(gas_phase_flags)
blk.solid_phase.properties.release_state(solid_phase_flags)
for t in blk.flowsheet().time:
for x in blk.length_domain:
blk.gas_phase.properties[t, x].pressure.fix()
blk.gas_phase.properties[t, x].temperature.fix()
blk.solid_phase.properties[t, x].temperature.fix()
blk.gas_phase.material_balances.activate()
if gas_phase.reaction_package is not None:
for t in blk.flowsheet().time:
gas_rxn_gen = blk.gas_phase.rate_reaction_generation
for x in blk.length_domain:
for p in gas_phase.property_package.phase_list:
for j in gas_phase.property_package.component_list:
(gas_rxn_gen[t, x, p, j].fix(0.0))
blk.solid_phase.material_balances.activate()
blk.solid_super_vel.activate()
if solid_phase.reaction_package is not None:
for t in blk.flowsheet().time:
solid_rxn_gen = blk.solid_phase.rate_reaction_generation
for x in blk.length_domain:
for p in solid_phase.property_package.phase_list:
for j in solid_phase.property_package.component_list:
(solid_rxn_gen[t, x, p, j].fix(0.0))
# Gas side heterogeneous rate reaction generation
for x in blk.length_domain:
for p in gas_phase.property_package.phase_list:
for j in gas_phase.property_package.component_list:
(blk.gas_phase.mass_transfer_term[t, x, p, j].fix(0.0))
init_log.info("Initialize Mass Balances")
init_log.info_high(
"initialize mass balances - no reactions and no pressure drop"
)
with idaeslog.solver_log(solve_log, idaeslog.DEBUG) as slc:
results = opt.solve(blk, tee=slc.tee)
if check_optimal_termination(results):
init_log.info_high(
"Initialization Step 3a {}.".format(idaeslog.condition(results))
)
else:
_log.warning("{} Initialization Step 3a Failed.".format(blk.name))
# Initialize mass balance - with reaction and no pressure drop
if gas_phase.reaction_package is not None:
# local aliases used to shorten object names
gas_rxn_gen = blk.gas_phase.rate_reaction_generation
gas_phase_stoichiometry_eqn = (
blk.gas_phase.rate_reaction_stoichiometry_constraint
)
# Initialize reaction property package
blk.gas_phase.reactions.activate()
for t in blk.flowsheet().time:
for x in blk.length_domain:
obj = blk.gas_phase.reactions[t, x]
for c in obj.component_objects(Constraint, descend_into=False):
c.activate()
blk.gas_phase.reactions.initialize(
outlvl=outlvl, optarg=optarg, solver=solver
)
for t in blk.flowsheet().time:
for x in blk.length_domain:
for r in gas_phase.reaction_package.rate_reaction_idx:
calculate_variable_from_constraint(
blk.gas_phase.rate_reaction_extent[t, x, r],
blk.gas_phase_config_rxn_ext[t, x, r],
)
for p in gas_phase.property_package.phase_list:
for j in gas_phase.property_package.component_list:
(gas_rxn_gen[t, x, p, j].unfix())
if not (
(
blk.gas_phase.config.transformation_scheme
!= "FORWARD"
and x == blk.length_domain.first()
)
or (
blk.gas_phase.config.transformation_scheme
== "FORWARD"
and x == blk.length_domain.last()
)
):
calculate_variable_from_constraint(
gas_rxn_gen[t, x, p, j],
gas_phase_stoichiometry_eqn[t, x, p, j],
)
gas_phase_stoichiometry_eqn.activate()
blk.gas_phase_config_rxn_ext.activate()
if solid_phase.reaction_package is not None:
# local aliases used to shorten object names
solid_rxn_gen = blk.solid_phase.rate_reaction_generation
solid_phase_stoichiometry_eqn = (
blk.solid_phase.rate_reaction_stoichiometry_constraint
)
gas_mass_transfer_term = blk.gas_phase.mass_transfer_term
# Initialize reaction property package
blk.solid_phase.reactions.activate()
for t in blk.flowsheet().time:
for x in blk.length_domain:
obj = blk.solid_phase.reactions[t, x]
for c in obj.component_objects(Constraint, descend_into=False):
c.activate()
blk.solid_phase.reactions.initialize(
outlvl=outlvl, optarg=optarg, solver=solver
)
for t in blk.flowsheet().time:
for x in blk.length_domain:
for p in gas_phase.property_package.phase_list:
for j in gas_phase.property_package.component_list:
(gas_mass_transfer_term[t, x, p, j].unfix())
calculate_variable_from_constraint(
gas_mass_transfer_term[t, x, p, j],
blk.gas_comp_hetero_rxn[t, x, p, j],
)
for x in blk.length_domain:
for r in solid_phase.reaction_package.rate_reaction_idx:
calculate_variable_from_constraint(
blk.solid_phase.rate_reaction_extent[t, x, r],
blk.solid_phase_config_rxn_ext[t, x, r],
)
for p in solid_phase.property_package.phase_list:
for j in solid_phase.property_package.component_list:
(solid_rxn_gen[t, x, p, j].unfix())
if not (
(
blk.solid_phase.config.transformation_scheme
!= "FORWARD"
and x == blk.length_domain.first()
)
or (
blk.solid_phase.config.transformation_scheme
== "FORWARD"
and x == blk.length_domain.last()
)
):
calculate_variable_from_constraint(
solid_rxn_gen[t, x, p, j],
solid_phase_stoichiometry_eqn[t, x, p, j],
)
blk.gas_comp_hetero_rxn.activate()
blk.solid_phase.rate_reaction_stoichiometry_constraint.activate()
blk.solid_phase_config_rxn_ext.activate()
if (
gas_phase.reaction_package is not None
or solid_phase.reaction_package is not None
):
init_log.info_high(
"initialize mass balances - with reactions and no pressure drop"
)
with idaeslog.solver_log(solve_log, idaeslog.DEBUG) as slc:
results = opt.solve(blk, tee=slc.tee)
if check_optimal_termination(results):
init_log.info_high(
"Initialization Step 3b {}.".format(idaeslog.condition(results))
)
else:
_log.warning("{} Initialization Step 3b Failed.".format(blk.name))
# Initialize mass balance - with pressure drop
for t in blk.flowsheet().time:
for x in blk.length_domain:
# Unfix all pressure variables except at the inlet
if blk.gas_phase.properties[t, x].config.defined_state is False:
blk.gas_phase.properties[t, x].pressure.unfix()
blk.gas_phase.pressure_balance.activate()
if blk.config.has_pressure_change:
blk.gas_phase_config_pressure_drop.activate()
for t in blk.flowsheet().time:
for x in blk.length_domain:
calculate_variable_from_constraint(
blk.gas_phase.deltaP[t, x],
blk.gas_phase_config_pressure_drop[t, x],
)
init_log.info_high(
"initialize mass balances - with reactions and pressure drop"
)
with idaeslog.solver_log(solve_log, idaeslog.DEBUG) as slc:
results = opt.solve(blk, tee=slc.tee)
if check_optimal_termination(results):
init_log.info_high(
"Initialization Step 3c {}.".format(idaeslog.condition(results))
)
else:
_log.warning("{} Initialization Step 3c Failed.".format(blk.name))
# ---------------------------------------------------------------------
# Initialize energy balance
if blk.config.energy_balance_type != EnergyBalanceType.none:
# Initialize dimensionless numbers,
# mass and heat transfer coefficients
for t in blk.flowsheet().time:
for x in blk.length_domain:
calculate_variable_from_constraint(
blk.Re_particle[t, x], blk.reynolds_number_particle[t, x]
)
calculate_variable_from_constraint(
blk.Pr_particle[t, x], blk.prandtl_number[t, x]
)
calculate_variable_from_constraint(
blk.Nu_particle[t, x], blk.nusselt_number_particle[t, x]
)
calculate_variable_from_constraint(
blk.gas_solid_htc[t, x], blk.gas_solid_htc_eqn[t, x]
)
calculate_variable_from_constraint(
blk.gas_phase.heat[t, x], blk.gas_phase_heat_transfer[t, x]
)
calculate_variable_from_constraint(
blk.solid_phase.heat[t, x], blk.solid_phase_heat_transfer[t, x]
)
# Unfix temperatures
for t in blk.flowsheet().time:
for x in blk.length_domain:
# Unfix all gas temperature variables except at the inlet
if blk.gas_phase.properties[t, x].config.defined_state is False:
blk.gas_phase.properties[t, x].temperature.unfix()
for x in blk.length_domain:
# Unfix all solid temperature variables except at the inlet
if blk.solid_phase.properties[t, x].config.defined_state is False:
blk.solid_phase.properties[t, x].temperature.unfix()
blk.reynolds_number_particle.activate()
blk.prandtl_number.activate()
blk.nusselt_number_particle.activate()
blk.gas_solid_htc_eqn.activate()
# Activate gas phase energy balance equations
blk.gas_phase_heat_transfer.activate()
blk.gas_phase.enthalpy_balances.activate()
# Activate solid phase energy balance equations
blk.solid_phase_heat_transfer.activate()
blk.solid_phase.enthalpy_balances.activate()
init_log.info("Initialize Energy Balances")
with idaeslog.solver_log(solve_log, idaeslog.DEBUG) as slc:
results = opt.solve(blk, tee=slc.tee)
if check_optimal_termination(results):
init_log.info_high(
"Initialization Step 4 {}.".format(idaeslog.condition(results))
)
else:
raise InitializationError(
f"{blk.name} failed to initialize successfully. Please "
f"check the output logs for more information."
)
# Initialize energy balance
if blk.config.energy_balance_type == EnergyBalanceType.none:
for t in blk.flowsheet().time:
for x in blk.length_domain:
# Unfix all gas temperature variables except at the inlet
if blk.gas_phase.properties[t, x].config.defined_state is False:
blk.gas_phase.properties[t, x].temperature.unfix()
for x in blk.length_domain:
# Unfix all solid temperature variables except at the inlet
if blk.solid_phase.properties[t, x].config.defined_state is False:
blk.solid_phase.properties[t, x].temperature.unfix()
blk.isothermal_gas_phase.activate()
blk.isothermal_solid_phase.activate()
init_log.info("Initialize Energy Balances")
with idaeslog.solver_log(solve_log, idaeslog.DEBUG) as slc:
results = opt.solve(blk, tee=slc.tee)
if check_optimal_termination(results):
init_log.info_high(
"Initialization Step 4 {}.".format(idaeslog.condition(results))
)
else:
raise InitializationError(
f"{blk.name} failed to initialize successfully. Please "
f"check the output logs for more information."
)
def calculate_scaling_factors(self):
super().calculate_scaling_factors()
# local aliases used to shorten object names
gas_phase = self.config.gas_phase_config
# Get units meta data from property packages
units_meta_gas = gas_phase.property_package.get_metadata().get_derived_units
# scale some variables
if hasattr(self, "bed_diameter"):
if iscale.get_scaling_factor(self.bed_diameter) is None:
sf = 1 / value(self.bed_diameter)
iscale.set_scaling_factor(self.bed_diameter, 1e-1 * sf)
if hasattr(self, "bed_area"):
if iscale.get_scaling_factor(self.bed_area) is None:
sf = 1 / value(constants.pi * (0.5 * self.bed_diameter) ** 2)
iscale.set_scaling_factor(self.bed_area, 1e-1 * sf)
if hasattr(self.gas_phase, "area"):
if iscale.get_scaling_factor(self.gas_phase.area) is None:
sf = iscale.get_scaling_factor(self.bed_area)
iscale.set_scaling_factor(self.gas_phase.area, sf)
if hasattr(self.solid_phase, "area"):
if iscale.get_scaling_factor(self.solid_phase.area) is None:
sf = iscale.get_scaling_factor(self.bed_area)
iscale.set_scaling_factor(self.solid_phase.area, sf)
if self.config.energy_balance_type != EnergyBalanceType.none:
if hasattr(self, "Re_particle"):
for (t, x), v in self.Re_particle.items():
if iscale.get_scaling_factor(v) is None:
sf1 = iscale.get_scaling_factor(
self.gas_phase.properties[t, x].dens_mass
)
sf2 = 1 / value(
pyunits.convert(
self.solid_phase.properties[t, x].params.particle_dia,
to_units=units_meta_gas("length"),
)
)
iscale.set_scaling_factor(v, 1e-1 * sf1 * sf2)
if hasattr(self, "Pr_particle"):
for (t, x), v in self.Pr_particle.items():
if iscale.get_scaling_factor(v) is None:
sf1 = iscale.get_scaling_factor(
self.gas_phase.properties[t, x].cp_mass
)
sf2 = iscale.get_scaling_factor(
self.gas_phase.properties[t, x].visc_d
)
iscale.set_scaling_factor(v, sf1 * sf2)
if hasattr(self, "Nu_particle"):
for (t, x), v in self.Nu_particle.items():
if iscale.get_scaling_factor(v) is None:
sf = 1 / (
value(
(
(
2.0
+ 1.1
* (
smooth_abs(self.Re_particle[t, x], self.eps)
** 0.6
)
** 3
)
* self.Pr_particle[t, x]
)
** (1 / 3)
)
)
iscale.set_scaling_factor(v, 1e-1 * sf)
if hasattr(self, "gas_solid_htc"):
if iscale.get_scaling_factor(self.gas_solid_htc) is None:
for (t, x), v in self.gas_solid_htc.items():
sf1 = iscale.get_scaling_factor(self.Nu_particle[t, x])
sf2 = iscale.get_scaling_factor(
self.gas_phase.properties[t, x].therm_cond
)
iscale.set_scaling_factor(v, sf1 * sf2)
# scale heat variables in CV1D
for (t, x), v in self.gas_phase.heat.items():
sf1 = iscale.get_scaling_factor(
self.gas_phase.properties[t, x].enth_mol
)
sf2 = iscale.get_scaling_factor(
self.gas_phase.properties[t, x].flow_mol
)
iscale.set_scaling_factor(v, sf1 * sf2)
for (t, x), v in self.solid_phase.heat.items():
sf1 = iscale.get_scaling_factor(
self.solid_phase.properties[t, x].enth_mass
)
sf2 = iscale.get_scaling_factor(
self.solid_phase.properties[t, x].flow_mass
)
iscale.set_scaling_factor(v, sf1 * sf2)
# Scale some constraints
if hasattr(self, "bed_area_eqn"):
for c in self.bed_area_eqn.values():
iscale.constraint_scaling_transform(
c, iscale.get_scaling_factor(self.bed_area), overwrite=False
)
if hasattr(self, "gas_phase_area"):
for (t, x), c in self.gas_phase_area.items():
iscale.constraint_scaling_transform(
c, iscale.get_scaling_factor(self.bed_area), overwrite=False
)
if hasattr(self, "solid_phase_area"):
for (t, x), c in self.solid_phase_area.items():
iscale.constraint_scaling_transform(
c, iscale.get_scaling_factor(self.bed_area), overwrite=False
)
if hasattr(self, "gas_super_vel"):
for (t, x), c in self.gas_super_vel.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(self.gas_phase.properties[t, x].flow_mol),
overwrite=False,
)
if hasattr(self, "solid_super_vel"):
for (t, x), c in self.solid_super_vel.items():
iscale.constraint_scaling_transform(
c,
1e-1
* iscale.get_scaling_factor(
self.solid_phase.properties[t, x].flow_mass
),
overwrite=False,
)
if hasattr(self, "gas_phase_config_pressure_drop"):
for (t, x), c in self.gas_phase_config_pressure_drop.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(self.gas_phase.deltaP[t, x]),
overwrite=False,
)
if hasattr(self, "gas_phase_config_rxn_ext"):
for (t, x, r), c in self.gas_phase_config_rxn_ext.items():
sf1 = iscale.get_scaling_factor(
self.gas_phase.reactions[t, x].reaction_rate[r]
)
sf2 = iscale.get_scaling_factor(self.bed_area)
iscale.constraint_scaling_transform(c, sf1 * sf2, overwrite=False)
if hasattr(self, "solid_phase_config_rxn_ext"):
for (t, x, r), c in self.solid_phase_config_rxn_ext.items():
sf1 = iscale.get_scaling_factor(
self.solid_phase.reactions[t, x].reaction_rate[r]
)
sf2 = iscale.get_scaling_factor(self.bed_area)
iscale.constraint_scaling_transform(c, sf1 * sf2, overwrite=False)
if hasattr(self, "gas_comp_hetero_rxn"):
for (t, x, p, j), c in self.gas_comp_hetero_rxn.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(
self.gas_phase.mass_transfer_term[t, x, p, j]
),
overwrite=False,
)
if self.config.energy_balance_type != EnergyBalanceType.none:
if hasattr(self, "reynolds_number_particle"):
for (t, x), c in self.reynolds_number_particle.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(self.Re_particle[t, x]),
overwrite=False,
)
if hasattr(self, "prandtl_number"):
for (t, x), c in self.prandtl_number.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(self.Pr_particle[t, x]),
overwrite=False,
)
if hasattr(self, "nusselt_number_particle"):
for (t, x), c in self.nusselt_number_particle.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(self.Nu_particle[t, x]),
overwrite=False,
)
if hasattr(self, "gas_solid_htc_eqn"):
for (t, x), c in self.gas_solid_htc_eqn.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(self.gas_solid_htc[t, x]),
overwrite=False,
)
if hasattr(self, "gas_phase_heat_transfer"):
for (t, x), c in self.gas_phase_heat_transfer.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(self.gas_phase.heat[t, x]),
overwrite=False,
)
if hasattr(self, "solid_phase_heat_transfer"):
for (t, x), c in self.solid_phase_heat_transfer.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(self.solid_phase.heat[t, x]),
overwrite=False,
)
elif self.config.energy_balance_type == EnergyBalanceType.none:
if hasattr(self, "isothermal_gas_phase"):
for (t, x), c in self.isothermal_gas_phase.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(
self.gas_phase.properties[t, x].temperature
),
overwrite=False,
)
if hasattr(self, "isothermal_solid_phase"):
for (t, x), c in self.isothermal_solid_phase.items():
iscale.constraint_scaling_transform(
c,
iscale.get_scaling_factor(
self.gas_phase.properties[t, x].temperature
),
overwrite=False,
)
[docs]
def results_plot(blk):
"""
Plot method for common moving bed variables
Variables plotted:
Tg : Temperature in gas phase
Ts : Temperature in solid phase
vg : Superficial gas velocity
P : Pressure in gas phase
Ftotal : Total molar flowrate of gas
Mtotal : Total mass flowrate of solid
Cg : Concentration of gas components in the gas phase
y_frac : Mole fraction of gas components in the gas phase
x_frac : Mass fraction of solid components in the solid phase
"""
print()
print(
"================================= Reactor plots ==============="
"=================="
)
# local aliases used to shorten object names
gas_phase = blk.config.gas_phase_config
solid_phase = blk.config.solid_phase_config
Tg = []
Ts = []
P = []
Ftotal = []
Mtotal = []
vg = []
for t in blk.flowsheet().time:
for x in blk.gas_phase.length_domain:
vg.append(value(blk.velocity_superficial_gas[t, x]))
fig_vg = plt.figure(1)
plt.plot(blk.gas_phase.length_domain, vg, label="vg")
plt.legend(loc=0, ncol=2)
plt.grid()
plt.xlabel("Bed height [-]")
plt.ylabel("Superficial gas velocity [m/s]")
fig_vg.savefig("superficial_vel.png")
# Pressure profile
for t in blk.flowsheet().time:
for x in blk.gas_phase.length_domain:
P.append(blk.gas_phase.properties[t, x].pressure.value)
fig_P = plt.figure(2)
plt.plot(blk.gas_phase.length_domain, P, label="P")
plt.legend(loc=0, ncol=2)
plt.grid()
plt.xlabel("Bed height [-]")
plt.ylabel("Total Pressure [Pa]")
fig_P.savefig("Pressure.png")
# Temperature profile
for t in blk.flowsheet().time:
for x in blk.gas_phase.length_domain:
Tg.append(blk.gas_phase.properties[t, x].temperature.value)
for x in blk.solid_phase.length_domain:
Ts.append(blk.solid_phase.properties[t, x].temperature.value)
fig_T = plt.figure(3)
plt.plot(blk.gas_phase.length_domain, Tg, label="Tg")
plt.plot(blk.solid_phase.length_domain, Ts, label="Ts")
plt.legend(loc=0, ncol=2)
plt.grid()
plt.xlabel("Bed height [-]")
plt.ylabel("Temperature [K]")
fig_T.savefig("Temperature.png")
# Bulk gas phase total molar flow rate
for t in blk.flowsheet().time:
for x in blk.gas_phase.length_domain:
Ftotal.append(blk.gas_phase.properties[t, x].flow_mol.value)
fig_Ftotal = plt.figure(4)
plt.plot(blk.gas_phase.length_domain, Ftotal)
plt.grid()
plt.xlabel("Bed height [-]")
plt.ylabel("Total molar gas flow rate [mol/s]")
fig_Ftotal.savefig("Total_gas_flow.png")
# Bulk solid phase total mass flow rate
for t in blk.flowsheet().time:
for x in blk.solid_phase.length_domain:
Mtotal.append(blk.solid_phase.properties[t, x].flow_mass.value)
fig_Mtotal = plt.figure(5)
plt.plot(blk.solid_phase.length_domain, Mtotal)
plt.grid()
plt.xlabel("Bed height [-]")
plt.ylabel("Solid total mass flow rate [kg/s]")
fig_Mtotal.savefig("Total_solid_flow.png")
# Gas phase mole fractions
for t in blk.flowsheet().time:
for j in gas_phase.property_package.component_list:
y_frac = []
for x in blk.gas_phase.length_domain:
y_frac.append(
value(blk.gas_phase.properties[t, x].mole_frac_comp[j])
)
fig_y = plt.figure(6)
plt.plot(blk.gas_phase.length_domain, y_frac, label=j)
plt.legend(loc=0, ncol=len(gas_phase.property_package.component_list))
plt.grid()
plt.xlabel("Bed height [-]")
plt.ylabel("y_frac [-]")
fig_y.savefig("Gas_mole_fractions.png")
# Solid phase mass fractions
for t in blk.flowsheet().time:
for j in solid_phase.property_package.component_list:
x_frac = []
for x in blk.solid_phase.length_domain:
x_frac.append(
value(blk.solid_phase.properties[t, x].mass_frac_comp[j])
)
fig_x = plt.figure(7)
plt.plot(blk.solid_phase.length_domain, x_frac, label=j)
plt.legend(loc=0, ncol=len(solid_phase.property_package.component_list))
plt.grid()
plt.xlabel("Bed height [-]")
plt.ylabel("x_frac [-]")
fig_x.savefig("Solid_mass_fractions.png")
# Gas phase concentrations
for t in blk.flowsheet().time:
for j in gas_phase.property_package.component_list:
Cg = []
for x in blk.gas_phase.length_domain:
Cg.append(blk.gas_phase.properties[t, x].dens_mol_comp[j].value)
fig_Cg = plt.figure(8)
plt.plot(blk.gas_phase.length_domain, Cg, label=j)
plt.legend(loc=0, ncol=len(gas_phase.property_package.component_list))
plt.grid()
plt.xlabel("Bed height [-]")
plt.ylabel("Concentration [mol/m3]")
fig_Cg.savefig("Gas_concentration.png")
def _get_stream_table_contents(self, time_point=0):
return create_stream_table_dataframe(
{
"Gas Inlet": self.gas_inlet,
"Gas Outlet": self.gas_outlet,
"Solid Inlet": self.solid_inlet,
"Solid Outlet": self.solid_outlet,
},
time_point=time_point,
)
