32.Ca系CO_2吸収剤存在下での石炭水蒸気ガス化における吸収剤と石炭鉱物の化学反応

概要

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In order to clarify mechanism in deactivation of Ca-based sorbents caused by solid-solid interaction with coal-derived minerals during lime-enhanced steam gasification of coal, first, multi-cycle CO_2 sorption tests of sorbents/ash mixtures at elevated temperature and pressure were performed with a laboratory-scale horizontal-tube reactor. The sorbents tended to undergo a solid-solid reaction with ash components during multi-cycle CO_2 sorption with an intermediate hydration stage. This reaction formed complex inorganics and substantially decreased the sorbents' CO_2 sorption ability. This chemical interaction was further examined by chemical analyses of residual solids obtained from high-pressure steam gasification of coal/sorbent mixtures. Our results indicate that the solid-solid interaction became significant at the higher temperature.
一般社団法人日本エネルギー学会の論文
2004-11-25