石炭の化学ループガス化•燃焼におけるガス生成特性

摘要

石炭は我が国において重要な基幹エネルギーの地位を占めており，その輸入量も増加傾向にある。しかし，東日本大震災の後，我が国のエネルギー政策の大幅な見直しが重要な課題となり，化石燃料から排出される二酸化炭素量を大幅に削減しなくてはならなくなつた。%The chemical looping reaction is applied to the combustion and gasification of coal for effective energy conversion. The reduction of metal oxide is examined in the fixed/fluidized bed of 20 mm I.D. and 1120 mm in height. As a lattice oxygen carrier, iron oxide is used and coated on the porous alumina of 0.2 mm mean diameter. Taiheiyo coal of 0.5 g is dropped into the test section and gas production profiles were measured with the temperature range 793 K through 983 K. Initial stage of the reaction, only carbon dioxide is observed, while the hydrogen is produced simultaneously for the insufficient amount of lattice oxygen. Hydrogen yield is about 2.5 times of the carbon content and this exceeds 2.0 which is obtained from the complete reactions of the Water gas and Shift reactions. The extra hydrogen is produced from the hydrogen contained in coal and it may give higher cold gas efficiency.