Abstract
A two-stage entrained bed coal gasifier has the feature that the entire coal gasifier can be operated at a low air content by controlling the coal and air feed rates to the combustor and the reductor section, respectively, independently. This paper describes the results of computer analysis on the different coal feed ratios to the combustor and the reductor before the test with our 2T/D coal gasifier. The main results are as follows: (1) We can expect a higher cold gas efficiency and calorific value at a lower combustor/reductor coal feed ratio, with the temperature of the raw gas at the combustor section kept constant; (2) In general, it is effective to lower the coal feed rate with the entire air feed ratios kept constant, for efficiently gasifying the high ash fusion temperature coal, but we assume that a high temperature cannot be obtained at the combustor section because the heat loss through the 2T/D gasifier wall tends to sharply increase at a lower combustor/reductor feed ratio.
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