(685g) Effects of CO2 Methanation on Economic Feasibility and Global Climate Change in Coal-Fired Power Plants

Kim, S., Hankyong National University
Lim, Y. I., Hankyong National University
Lee, D., Korea Institute of Energy Research
Seo, M. W., Korea Institute of Energy Research
The continued use of fossil fuels due to industrial development, economic and population growth has increased the concentration of CO2 in the atmosphere that causes climate change. The carbon capture and storage (CCS) technology has been developed to mitigate the increase of CO2 in the atmosphere. The CO2 capture and utilization (CCU) technology has been proposed to resolve the limitation of the storage capacity of the captured CO2. This study presented a techno-economic feasibility of 500 MWe coal-fired circulating fluidized-bed (CFB) power plants including CCU. An amine absorber unit (AAU) and a CO2 processing unit (CPU) were used to capture CO2, in air- and oxy- combustion CFBs, respectively. Only 2% and 5% of the captured CO2 were methanized with H2 because of the excessive consumption of electricity in water alkaline electrolysis (AEL) that produces H2. The effects of CO2 methanation with H2 on the global climate change were investigated for coal-fired power plants around the world.