Methanation of anode off-gas to improve carbon dioxide capture

• Main Author: JAHNKE FRED C
• Format: Patent
• Language: Chinese; English
• Published: 14.07.2023
• Subjects: ACYCLIC OR CARBOCYCLIC COMPOUNDS; AIR INTAKES FOR JET-PROPULSION PLANTS; BASIC ELECTRIC ELEMENTS; BLASTING; CHEMISTRY; COMBUSTION ENGINES; COMPOUNDS THEREOF; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS; ELECTRICITY; ENGINE PLANTS IN GENERAL; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES; GAS-TURBINE PLANTS; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; INORGANIC CHEMISTRY; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; METALLURGY; NON-METALLIC ELEMENTS; ORGANIC CHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SEPARATION; STEAM ACCUMULATORS; STEAM ENGINE PLANTS; STEAM ENGINES; TRANSPORTING; WEAPONS

A method of increasing carbon dioxide concentration in anode off-gas, the method comprising: flowing flue gas to a cathode portion of a fuel cell assembly; flowing an anode off-gas containing hydrogen and dioxide from an anode portion of the fuel cell assembly to a methane converter; converting a portion of hydrogen and a portion of carbon dioxide in the anode exhaust gas into methane using a methane converter to produce a methanated anode exhaust gas having a carbon dioxide concentration higher than that of the anode exhaust gas; and separating carbon dioxide from the methanated anode off-gas using a gas separation device. 一种增加阳极废气中二氧化碳浓度的方法，所述方法包括：使烟气流向燃料电池组件的阴极部分；使来自所述燃料电池组件的阳极部分的含有氢气和二氧阳极废气流向甲烷转化器；利用甲烷转化器将阳极废气中的一部分氢气和一部分二氧化碳转化为甲烷，以产生二氧化碳浓度高于所述阳极废气的甲烷化的阳极废气；和利用气体分离装置从所述甲烷化的阳极废气中分离二氧化碳。