石炭ガス化中カロリー燃料のNO_x生成特性

概要

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Medium-Btu coal gasified fuel, the higher heating value of which is about 4.2 to 12.7 MJ/m^3,is composed of CO and H_2,as its main combustible components. Moreover, it contains small amounts of NH_3 and CH_4. NH_3 will be converted to NO_x 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-NO_x 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 NO_x conversion rate is made minimum exists. This optimum equivalence ratio become higher when the fuel calorific value is high. (3) The NO_x conversion rate rises as CH_4 concentration increases. When the two stage combustion method is used, the optimum primary equivalence ratio which makes the NO_x conversion rate minimum rises as CH_4 concentration decreases.
社団法人日本機械学会の論文
1997-09-25