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the syngas stream from the electrolysis unit are combined, compressed through the circulator, and electrically heated to the electrolysis temperatures before passing through the electrolyzer. The syngas passes through the Sabatier reactors to make methane and water. The water is condensed and mixed with incoming water and the methane, and some hydrogen is discarded. The oxygen exiting the electrolyzer is cooled by an ambient cooler. 5. Boudouard and Co-electrolysis integrated model The Bosch process was modified by removing the water gas shift reactor and combined with the high- temperature co-electrolysis process as shown in Figure 15. Carbon dioxide is fed to the Boudouard reactior at 172kPa (25 psia) and is heated by the hot oxygen product from the electrolysis unit. Figure 15. Process flow diagram of Boudouard process with co-electrolysis This stream is mixed with carbon dioxide from the Boudouard reactor and some carbon monoxide from the co- electrolysis unit to constitute a molar flow of 10% carbon monoxide and 90% carbon dioxide. The carbon monoxide is used to provide reducing conditions at the carbon monoxide side of the solid oxide electrolysis cells. A high temperature recuperating heat exchanger heats the stream to nearly 700°C and is further heated to 800°C by an electric heater. The carbon dioxide is electrolyzed to carbon monoxide and oxygen in the electrolyzer. The molar composition of the exit stream at the carbon side of the electrolyzer is 90% carbon monoxide and 10% carbon dioxide. Electrolysis unit was set to avoid the full electrolysis of the carbon dioxide to prevent the formation of carbon within the electrolysis unit. If too much current is applied to the electrolysis cells, the carbon monoxide will reduce to form oxygen and solid carbon. The carbon could impair the cells. The carbon monoxide passes through the Boudouard reactor where solid carbon and carbon dioxide are formed at a temperature of 350°C. In this process no water or hydrogen is used and no methane is produced. 17 American Institute of Aeronautics and AstronauticsPDF Image | CO2 and Steam Co-Electrolysis for Resource Utilization in Space
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