微粉炭の熱分解における熱物質移動に炭種がおよぼす影響に関する研究

抄録

The dependence of volatile content of pulverized coal on its pyrolytic conversion has been investigated to understand heat and mass transfer. For coal with having about 40 % (coal A) volatile the char yield decreased dramatically with temperature until 823 K and approached slowly to the constant value. On the other hand, the decrement of char yield with temperature for coal with having about 30 % volatile (coal B) was smaller than that for coal A. The temperature increased slowly with time during gas generating and was equal or higher than 373 K for coal A. So, generated gas could include not only moisture but also part of released volatile. On the other hand, the generated gas volume for coal B was smaller than that for coal A. The coal A was more thermal decomposable material than coal B. The time course of generated gas volume and temperature during pyrolysis at T_R = 1023 K was different from that at T_R = 623 K because the coal B could decompose to the lighter tar than that for the coal A.