Abstract
Changes are needed to improve the efficiency and lower the CO2 emissions of traditional coal-fired power generation, which is the main source of global CO2 emissions. The integrated gasification fuel cell (IGFC) process, which combines coal gasification and high-temperature fuel cells, was proposed in 2017 to improve the efficiency of coal-based power generation and reduce CO2 emissions. Supported by the National Key R&D Program of China, the IGFC for near-zero CO2 emissions program was enacted with the goal of achieving near-zero CO2 emissions based on (1) catalytic combustion of the flue gas from solid oxide fuel cell (SOFC) stacks and (2) CO2 conversion using solid oxide electrolysis cells (SOECs). In this work, we investigated a kW-level catalytic combustion burner and SOEC stack, evaluated the electrochemical performance of the SOEC stack in H2O electrolysis and H2O/CO2 co-electrolysis, and established a multi-scale and multi-physical coupling simulation model of SOFCs and SOECs. The process developed in this work paves the way for the demonstration and deployment of IGFC technology in the future.
Highlights
Over the past few decades, the tremendous demand for energy caused by industrialization has resulted in a substantial increase in CO2 emissions
Supported by the National Key R&D Program of China, the Integrated gasification fuel cell (IGFC) for nearzero CO2 emissions program was enacted with the goal of achieving near-zero CO2 emissions based on (1) catalytic combustion of the flue gas from solid oxide fuel cell (SOFC) stacks and (2) CO2 conversion using solid oxide electrolysis cells (SOECs)
We investigated a kW-level catalytic combustion burner and SOEC stack, evaluated the electrochemical performance of the SOEC stack in H2O electrolysis and H2O/CO2 co-electrolysis, and established a multiscale and multi-physical coupling simulation model of SOFCs and SOECs
Summary
Over the past few decades, the tremendous demand for energy caused by industrialization has resulted in a substantial increase in CO2 emissions. In 2017, the China energy group launched the IGFC for near-zero CO2 emissions program with support from the National Key R&D Program of China and 11 other organizations This project focuses on coal gasification purification, high-temperature fuel cells, CO2 capture and conversion, and IGFC system integration. Syngas produced by coal gasification, which has been used as a fuel for solid oxide fuel cell (SOFC) stacks, usually retains a small amount of unreacted CO and H2 after the electrochemical reaction Both power generation and CO2 enrichment require the complete conversion of CO and H2; the catalytic combustion of the fuel gas is an essential component of the IGFC process (Sung et al 2018; Kawabata et al 2012). We developed kW-level SOEC stacks and evaluated their electrochemical performance for H2O electrolysis and H2O/CO2 co-electrolysis
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