System and method for preparing synthesis gas by electrolyzing low-cost CO2 in solid oxide electrolytic tank

Abstract

The invention discloses a system and a method for preparing synthesis gas by electrolyzing low-cost CO2 in a solid oxide electrolytic tank. The system is composed of a direct CO2 capture unit and a solid oxide electrolytic tank unit, wherein the direct CO2 capture unit comprises a dryer, a CO2 adsorption chamber, a condenser, a gas-liquid separator, a gas pump, a gas tank, a CO2 concentration detector and the like; the solid oxide electrolytic tank unit comprises a steam generator, a heating furnace, a solid oxide electrolytic tank and the like. According to the system, low-concentration CO2 in air or high-concentration CO2 in flue gas is directly captured by regulating and controlling the humidity of the CO2 capturing unit; the CO2 containing air captured at a low cost is introduced intothe solid oxide electrolytic cell unit, H2O and the CO2 containing air are co-electrolyzed by the cathode of the electrolytic cell to generate synthesis gas, and methane is introduced into the anode of the electrolytic cell to reduce the overpotential of the reaction and generate the synthesis gas. According to the invention, not only is negative emission of CO2 realized, but also resource utilization of greenhouse gas is achieved, so that environmental and economic benefits are obtained.

Description

technical field [0001] The invention relates to the field of negative emission of carbon dioxide in the air and energy conversion and utilization, in particular to a solid oxide electrolytic cell for electrolysis of low-cost CO 2 Systems and methods for producing syngas. Background technique [0002] In recent years, the worldwide consumption of hydrocarbon fossil fuels has been increasing, making CO 2 Emissions continue to increase, and the problems brought about by global climate change are becoming increasingly prominent. To mitigate the greenhouse gas CO 2 emissions, CO 2 The capture and storage of CO2 is considered to be a more effective mid-term solution, but currently CO 2 The cost of capturing is relatively high, and the method of sealing is easy to leak when natural disasters such as earthquakes occur. Therefore, in addition to carbon sequestration, resource utilization of carbon is also considered as a way to mitigate man-made CO 2 Economically viable options...

AI Technical Summary

Problems solved by technology

[0004] Co-electrolysis of H in solid oxide electrolytic cells 2 O and CO 2 Syngas production technology has been widely used in CO 2 conversion, but conventional solid oxide electrolysis cell technology has never combined air or oxygen with CO 2 This is because the strong oxidizing ability of oxygen may lead to oxidative deactivation of cathode materials. These limitations make it difficult for traditional solid oxide electrolysis cell technology to be integrated with upstream wet CO regeneration. 2 Combined direct capture technology

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