BoilerTurbogenerator#
- class BoilerTurbogenerator(ID='', ins=None, outs=('emissions', 'rejected_water_and_blowdown', 'ash_disposal'), thermo=None, *, boiler_efficiency=None, turbogenerator_efficiency=None, side_steam=None, agent=None, other_agents=None, fuel_price=None, natural_gas_price=None, ash_disposal_price=None, T_emissions=None, CO2_emissions_concentration=None, satisfy_system_electricity_demand=None, boiler_efficiency_basis=None, fuel_source=None, oxygen_rich_gas_composition=None)[source]#
Create a BoilerTurbogenerator object that will calculate electricity generation from burning the feed. It also takes into account how much steam is being produced, and the required cooling utility of the turbo generator. All capital cost correlations are based on [1].
- Parameters:
ins (
Sequence[AbstractStream], optional) –[0] Liquid/solid feed that will be burned.
[1] Gas feed that will be burned.
[2] Make-up water.
[3] Natural gas/fuel to satisfy steam and electricity demand.
[4] Lime for flue gas desulfurization.
[5] Boiler chemicals.
[6] Air or oxygen-rich gas.
outs (
Sequence[AbstractStream], optional) –[0] Total emissions produced.
[1] Blowdown water.
[2] Ash disposal.
boiler_efficiency (float, optional) – Fraction of heat transferred to steam. Defaults to 0.8.
turbo_generator_efficiency (float, optional) – Fraction of steam heat converted to electricity. Defaults to 0.85.
agent (UtilityAgent, optional) – Steam produced. Defaults to low pressure steam.
() (other_agents =) – Other steams produced. Defaults to all other heating agents.
fuel_source (str, optional) – Name fuel used to satisfy steam and electricity demand. Defaults to ‘CH4’.
fuel_price (float, optional) – Price of natural gas [USD/kg]. Same as bst.stream_utility_prices[‘Natural gas’], which defaults to 0.218.
ash_disposal_price (float, optional) – Price of disposing ash [USD/kg]. Same as bst.stream_utility_prices[‘Ash disposal’], which defaults to -0.0318.
satisfy_system_electricity_demand (bool, optional) – Whether to purchase natural gas to satisfy system electricity demand if there is not enough heat from process feeds (i.e., inlets 0 and 1). If True, natural gas is purchased to satisfy system heat and electricity demand when there is not enough heat from the feed and gas. If False, natural gas is only purchased to satisfy system heat demand and electricity will be purchased from the grid if there is not enough heat from the feeds. In either case, if there is excess heat from the process feeds, electricity will still be produced.
boiler_efficiency_basis (str, optional) – Basis of boiler efficiency. Defaults to ‘LHV’ (i.e., lower heating value). ‘HHV’ (i.e., higher heating value) is also a valid basis.
Examples
Create a boiler-turbogenerator system that uses sugarcane bagasse to produce steam for a distillation unit and any excess steam for surplus electricity:
>>> import biosteam as bst >>> from biorefineries import cane >>> chemicals = cane.create_sugarcane_chemicals() >>> chemicals.define_group( ... name='Fiber', ... IDs=['Cellulose', 'Hemicellulose', 'Lignin'], ... composition=[0.4704 , 0.2775, 0.2520], ... wt=True, # Composition is given as weight ... ) >>> bst.settings.set_thermo(chemicals) >>> dilute_ethanol = bst.Stream('dilute_ethanol', Water=1390, Ethanol=590) >>> bagasse = bst.Stream('bagasse', Water=0.4, Fiber=0.6, total_flow=8e4, units='kg/hr') >>> with bst.System('sys') as sys: ... D1 = bst.BinaryDistillation('D1', ins=dilute_ethanol, Lr=0.999, Hr=0.89, k=1.25, LHK=('Ethanol', 'Water')) ... BT = bst.BoilerTurbogenerator('BT') ... BT.ins[0] = bagasse >>> sys.simulate() >>> BT.show() BoilerTurbogenerator: BT ins... [0] bagasse phase: 'l', T: 298.15 K, P: 101325 Pa flow (kmol/hr): Water 1.78e+03 Cellulose 139 Hemicellulose 101 Lignin 79.5 [1] - phase: 'l', T: 298.15 K, P: 101325 Pa flow: 0 [2] - phase: 'l', T: 298.15 K, P: 101325 Pa flow: 488 kmol/hr Water [3] - phase: 'g', T: 288.71 K, P: 101560 Pa flow: 0 [4] - phase: 'l', T: 298.15 K, P: 101325 Pa flow: 0 [5] - phase: 'l', T: 298.15 K, P: 101325 Pa flow: 0.567 kmol/hr Ash [6] - phase: 'g', T: 298.15 K, P: 101325 Pa flow (kmol/hr): O2 9.85e+03 N2 4.23e+04 outs... [0] emissions phase: 'g', T: 394.15 K, P: 101325 Pa flow (kmol/hr): Water 3.19e+03 CO2 1.98e+03 O2 7.84e+03 N2 4.23e+04 [1] rejected_water_and_blowdown phase: 'l', T: 298.15 K, P: 101325 Pa flow: 488 kmol/hr Water [2] ash_disposal phase: 'l', T: 298.15 K, P: 101325 Pa flow (kmol/hr): Water 0.00944 Ash 0.567
>>> BT.results() # Steam and electricity are produced, so costs are negative Boiler turbogenerator Units BT Electricity Power kW -1.31e+05 Cost USD/hr -1.02e+04 Low pressure steam Duty kJ/hr -7.33e+07 Flow kmol/hr -1.89e+03 Cost USD/hr -450 Cooling water Duty kJ/hr -8.42e+07 Flow kmol/hr 5.75e+04 Cost USD/hr 28.1 Fuel (inlet) Flow kg/hr 0 Cost USD/hr 0 Ash disposal (outlet) Flow kg/hr 0.737 Cost USD/hr 0.0234 Design Work kW 1.33e+05 Flow rate kg/hr 2.93e+05 Ash disposal kg/hr 0.737 Purchase cost Baghouse bags USD 81.1 Boiler USD 3.33e+07 Deaerator USD 3.58e+05 Amine addition pkg USD 4.69e+04 Hot process water softener system USD 9.16e+04 Turbogenerator USD 1.94e+07 Total purchase cost USD 5.32e+07 Installed equipment cost USD 9.62e+07 Utility cost USD/hr -1.07e+04
Notes
The flow rate of natural gas, lime, and boiler chemicals (streams 3-5) is set by the BoilerTurbogenerator object during simulation.
References
- property makeup_water#
[Stream] Makeup water due to boiler blowdown.
- property fuel#
[Stream] Fuel used to satisfy steam and electricity requirements.
- property natural_gas#
[Stream] Fuel used to satisfy steam and electricity requirements.
- property air#
[Stream] Air or oxygen rich gas used to supply oxygen for combustion.
- property oxygen_rich_gas#
[Stream] Air or oxygen rich gas used to supply oxygen for combustion.
- property ash_disposal#
[Stream] Ash disposal.
- property fuel_price#
[Float] Price of natural gas, same as bst.stream_utility_prices[‘Natural gas’].
- property natural_gas_price#
[Float] Price of natural gas, same as bst.stream_utility_prices[‘Natural gas’].
- property ash_disposal_price#
[Float] Price of ash disposal, same as bst.stream_utility_prices[‘Ash disposal’].
-
line:
str= 'Boiler turbogenerator'# class-attribute Name denoting the type of Unit class. Defaults to the class name of the first child class
- run()#
Run mass and energy balance. This method also runs specifications user defined specifications unless it is being run within a specification (to avoid infinite loops).
See also
_run,specifications,add_specification,add_bounded_numerical_specification