SOEC Electrolyzer (SOECElectrolyzer)

Class: SOECElectrolyzer | Module: energysim.models.hydrogen | Validation benchmarks | Units

Overview

Solid Oxide Electrolyzer Cell (SOEC) for high-temperature steam electrolysis.

Simple specific-consumption model: H2 = P / spec_elec_kwh_kg limited by the available steam (spec_steam_kg_per_kg_h2 kg steam per kg H2, stoichiometric minimum 8.94). There is no stack voltage / thermoneutral-heat model: the electricity figure assumes the heat for steam generation is supplied externally. That heat is reported as Q_steam_MW_th = m_steam * steam_enthalpy_kj_kg, the thermal demand to turn feed water into steam at stack conditions (default 3900 kJ/kg: liquid water at ~25 degC to ~750 degC steam at ~1 bar; adjust to your steam source).

operating_temp_c is only a validity guard (600-900 degC, ValueError otherwise); it does not enter the calculation. Stateless: dt has no effect.

Parameters

Parameter	Type	Default	Unit	Description
name	str	'SOEC_Electrolyzer'	-	Unique component name identifier
p_nominal_mw	float	2.0	MW	Nominal electrical stack power rating
operating_temp_c	float	750.0	degC	-
spec_elec_kwh_kg	float	38.0	kWh/kg	-
spec_steam_kg_per_kg_h2	float	9.0	kg/kg H2	-
steam_enthalpy_kj_kg	float	3900.0	kJ/kg	-
step_size	float	1.0	s	-

Inputs

Variable	Unit	Description
P_cmd	MW	Active power setpoint
steam_available_kg_hr	kg/h	-

Outputs

Variable	Unit	Description
P_actual	MW	Actual electrical power consumed
m_dot_H2_kg_hr	kg/h	Hydrogen production rate
steam_consumed_kg_hr	kg/h	-
Q_steam_MW_th	MW	-

Validity and notes

Validity: operating_temp_c between 600 and 900 degC (enforced at construction); steady state, constant specific electricity consumption independent of load and temperature; the heat for steam generation is supplied externally.

Usage example

from energysim import world
from energysim.models import SOECElectrolyzer

sim = world(start_time=0, stop_time=3600, t_macro=900)
sim.add_model('soecelectrolyzer', model=SOECElectrolyzer(), outputs=['P_actual', 'm_dot_H2_kg_hr', 'steam_consumed_kg_hr'], step_size=60)
res = sim.simulate()
print(res['soecelectrolyzer'].tail(2))