55.石炭中のAl,Si鉱物形態が石炭灰の溶融特性に及ぼす影響

抄録

CCSEM was applied to analyze the sample ash particles captured at the outlet of gasifier (Process developing unit of CRIEPI, coal feed rate is 2 ton/day). It was confirmed that Kaolinite and Quartz are the major mineral matters, whose concentration is about 60% on the average among 10 coal brands. The analysis from the view point of behavior of Kaolinite and Quartz showed that calcium is quite effective as a cause of eutectic melt of Kaolinite, but not so effective in case of Quartz. Three phase equilibrium diagram proved that effect of eutectic melt by calcium on Kaolinite is different from that on Quartz. Through the consideration by three phase equilibrium diagrams, effect of major basic oxides on eutectic melt of Kaolinite and Quartz was clarified. As a conclusion, amount of Kaolinite, Quartz and effective basic oxides are important to predict the difference of melting characteristic in each coal brand.