CO2 and Steam Co-Electrolysis for Resource Utilization in Space

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CO2 and Steam Co-Electrolysis for Resource Utilization in Space ( co2-and-steam-co-electrolysis-resource-utilization-space )

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with the water and some hydrogen and carbon monoxide from the exit stream of co-electrolysis process. Hydrogen and carbon monoxide constitutes approximately 10% of the molar composition of the inlet stream into the electrolysis process. The purpose of this is to provide reducing conditions at the hydrogen side (anode) of the solid oxide electrolysis cells. The recuperated heat from the exothermic Sabatier reactor further heats the stream to a vapor, which passes through a gas circulator to the high temperature recuperating heat exchanger. Although the heat transfer from the Sabatier reactors is not shown directly on the process flow diagram, an embedded spreadsheet was used to sum up the heats of both Sabatier reactors and the resulted amount of heat is used to operate the Sabatier heater. The gas is heated to over 700°C. However, it needs further heating through a high temperature electric heater to reach the electrolysis temperature of 800°C. Figure 13. Process flow diagram of co-electrolysis integrated Sabatier process The gases as they enter the electrolysis unit shift composition at this temperature. The metals that make up the solid oxide electrolyzer cells act as a catalyst for this water gas shift reaction. This is simulated in the model by using a Gibb reactor. The products leaving the co-electrolysis unit are primarily hydrogen and carbon monoxide with traces of water and carbon dioxide. The oxygen also exits the electrolysis module in another stream. Both 15 American Institute of Aeronautics and Astronautics

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