NDLI: Process Model for the Production of Syngas via High Temperature Co-Electrolysis

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Mckellar, M. G. O’brien, J. E. Stoots, C. M. Hawkes, G. L.
Abstract	A process model has been developed to evaluate the potential performance of a large-scale 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 co-electrolysis 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 entire process would be climate neutral.
Starting Page	691
Ending Page	699
Page Count	9
File Format	PDF
ISBN	0791843009
DOI	10.1115/IMECE2007-43658
e-ISBN	0791838129
Volume Number	Volume 6: Energy Systems: Analysis, Thermodynamics and Sustainability
Conference Proceedings	ASME 2007 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2007-11-11
Publisher Place	Seattle, Washington, USA
Access Restriction	Subscribed
Subject Keyword	Climate Temperature Hydrogen Heat losses Carbon dioxide Systems analysis High temperature Biomass Fuels Syngas Gas flow Recycling Current density Turbines Computational fluid dynamics Equilibrium (physics) Compressors Heat exchangers Flow (dynamics) Carbon Electrolysis Pumps Steam Nuclear reactors Anodes
Content Type	Text
Resource Type	Article

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