Abstract
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 TR = 1023 K was different from that at TR = 623 K because the coal B could decompose to the lighter tar than that for the coal A.
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