Abstract
Medium-Btu coal gasified fuel, the higher heating value of which is about 4.2 to 12.7 MJ/m3, is composed of CO and H2, as its main combustible components. Moreover, it contains small amounts of NH3 and CH4. NH3 will be converted to NOx in the combustion process. In this study, the basic combustion characteristics of the coal gasified fuel were examined by combustion experiments using a laboratory scale combustor. The main results are as folows : (1) The amount of thermal-NOx production increases rapidly as the amount of fuel calorific value of coal gas increases. (2) When the two stage combustion method is used, the optimum equivalence ratio of the primary combustion zone by which the NOx conversion rate is made minimum exists. This optimum equivalence ratio become higher when the fuel calorific value is high. (3) The NOx conversion rate rises as CH4 concentration increases. When the two stage combustion method is used, the optimum primary equivalence ratio which makes the NOx conversion rate minimum rises as CH4 concentration decreases.
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