Parametric Study Of Large-Scale Production Of Syngas Via High Temperature Co-Electrolysis
A process model has been developed to evaluate the potential performance of a largescale high-temperature co-electrolysis plant for the production of syngas from steam and carbon dioxide. The co-electrolysis process allows for direct electrochemical reduction of the steam – carbon dioxide gas mixture, yielding hydrogen and carbon monoxide, or syngas. The process model has been developed using the Honeywell UniSim systems analysis code. Using this code, a detailed process flow sheet has been defined that includes all the components that would be present in an actual plant such as pumps, compressors, heat exchangers, turbines, and the electrolyzer. Since the electrolyzer is not a standard UniSim component, a custom one-dimensional co-electrolysis model was developed for incorporation into the overall UniSim process flow sheet. The one dimensional co-electrolysis model assumes local chemical equilibrium among the four process-gas species via the gas shift reaction. The electrolyzer model allows for the determination of co-electrolysis outlet temperature, composition (anode and cathode sides); mean Nernst potential, operating voltage and electrolyzer power based on specified inlet gas flow rates, heat loss or gain, current density, and cell area-specific resistance. The one-dimensional electrolyzer model was validated by comparison with results obtained from a fully three dimensional computational fluid dynamics model developed using FLUENT, and by comparison to experimental data. This paper provides representative results obtained from the UniSim flow sheet model for a 300 MW co-electrolysis plant, coupled to a high-temperature gas-cooled nuclear reactor. The coelectrolysis process, coupled to a nuclear reactor, provides a means of recycling carbon dioxide back into a useful liquid fuel. If the carbon dioxide source is based on biomass, the overall process, from production through utilization, would be climate neutral.
- Research Organization:
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- DE-AC07-99ID-13727
- OSTI ID:
- 924501
- Report Number(s):
- INL/CON-07-12819; TRN: US0802898
- Resource Relation:
- Journal Volume: 34; Journal Issue: 9; Conference: 2007 AIChE Annual Meeting,Salt Lake City, UT,11/04/2007,11/09/2007
- Country of Publication:
- United States
- Language:
- English
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Development and Validation of a One-Dimensional Co-Electrolysis Model for Use in Large-Scale Process Modeling Analysis
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Related Subjects
10 SYNTHETIC FUELS
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS
BIOMASS
CARBON DIOXIDE
CARBON MONOXIDE
CATHODES
CLIMATES
COMPRESSORS
COMPUTERIZED SIMULATION
CURRENT DENSITY
FLOWSHEETS
FLUID MECHANICS
GAS FLOW
HEAT EXCHANGERS
HYDROGEN
LIQUID FUELS
PRODUCTION
REACTORS
RECYCLING
STEAM
SYSTEMS ANALYSIS
TURBINES
hydrogen production
nuclear energy
Synthetic fuels