39.石炭熱分解時の揮発分窒素の脱離挙動とカルシウムの役割

抄録

Release of volatile-N (tar-N, HCN and NH_3) from 11 coals during pyrolysis at 400K/min has been studied with a fixed bed quartz reactor, and factors controlling volatile-N have been examined. When demineralized coals are pyrolyzed at 1035℃, NH_3 decreases but tar-N increases for all coals. Addition of Ca catalyst after demineralization promotes NH_3 formation at 700-135℃, whereas it suppresses tar-N. Ca catalysts are transformed upon pyrolysis into fine particles of CaO. It is suggested that the highly dispersed CaO particles catalyze NH_3 formation through the secondary decomposition of tar-N and solidphase reactions of char-N above 1000℃.