A circulating fluidized bed gasifier was developed to produce CO and H2 gas from municipal solid waste(MSW). MSW was gasified by using air at 1,020-1,170K. Faultless operation of gasifier with shredded and dried MSW was continued. During operation, the relations of temperature in free board and air feeding rate with the gas composition and product gas flow rate were analyzed. The equilibrium calculation of gasification with carbon discharge from gasifier was executed to estimate the crude gas

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... mposition. From the comparison between experimental data and calculated results, it was concluded that the product gas composition was determined mainly by water gas shift reaction under the conditions of temperature range of 1,020-1,170K and residence time of 5 seconds in the free board.