Demonstration of methanation using flue gas from waste incineration plant as feedstock

Abstract

In order to achieve carbon neutrality by 2050, we need to reduce CO2 emissions. In recent years, attention has focused on technologies that reduce CO2 emissions by using CO2 as a raw material to produce chemical substances to replace fossil fuel-derived substances. Methanation is a technology to generate CH4 by reacting CO2 and H2, and the generated CH4 can be used as a substitute for natural gas. As part of a project commissioned by the Ministry of the Environment, a demonstration test was conducted to produce CH4 on a commercial scale by extracting some of the flue gas from the No. 4 furnace at the Odawara City Waste Incineration Plant and capturing CO2. The test results confirmed that CH4 can be produced from the flue gas of the waste incineration plant, and the targeted CO2 capture rate of more than 50%, CO2 concentration of the captured gas of more than 80%, and CO2 conversion rate of more than 90% were achieved. In addition, the CO2 emission reduction effect was estimated, and it was confirmed that a reduction of approximately 0.3 t-CO2/t-captured CO2 can be expected when low-carbon H2 is used for methanation.