No.28 石炭の熱分解過程における窒素と硫黄の行方ならびに軟化溶融性能に及ぼす影響(熱分解・コークス(1),灰・微量元素(1))

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The fate of the nitrogen and sulfur present in seven caking coals during pyrolysis has been studied with a flow-type fixed-bed quartz reactor to examine the effects of these heteroatoms on coal fluidity. The Gieseler maximum fluidity (MF) appears around 450℃ with all coals. The MF values range from 1.1 to 4.1 log(ddpm) and depend strongly on the type of coal. The evolution of HCN, NH_3, H_2S and tar-S starts after 350℃, whereas char-N, organic-S and FeS_2 decrease beyond 350℃. FeS_2 can readily be transformed to FeS and H_2S at 350-650℃. The evolution amounts of gaseous N- and S-containing species depend on the kind of coal. The MF value tends to increase with increasing total amount of HCN, NH_3 or H_2S evolved up to 450℃. Although the addition of 1 wt% aliphatic-N, inorganic-N or S-containing compounds to coal decreases coal fluidity, but polycyclic aromatic compounds increase the fluidity.
2012-10-15