Abstract
ABSTRACTDusty tar is an undesired product obtained from a coal pyrolysis/combustion system. Thermal conversion of dusty tar into fuel gas was studied with a fixed-bed reactor. It is found that C2-C5 hydrocarbons are mainly derived from the cracking of long-chain aliphatics, while CH4 from the decomposition of long-chain aliphatics and alkyl-substituted aromatic chemicals. The yield of the gas product increases monotonously, but the heating value of gas gradually decreases as temperature increases from 400 to 950°C. Decomposition of chemicals with a boiling point over 360°C contributes to 50–90% C1-C5 hydrocarbons and COx when pyrolysis temperature is lower than 600°C.
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