Coal gaseous fuels contain NH
3 which will be converted to NO
x in the gas turbine combustion process, if gas cleaning system is a hot type. Main com-bustible gas components of the coal gaseous fuel are CO and H
2, moreover a small amount of CH4 will be contained. Hydrocarbon such as CH
4 has the effect on NO
x formation from fuel nitrogen such as NH
3.
In this study, combustion tests were conducted by using a laboratory scale com-bustor for the study of the influence of the coal gaseous fuel properties on NO
x emis-sion characteristics.
Main results are as follows;
(1) NH
3 conversion to NO
x increases with increasing CH
4 concentration in coal gaseous low BTU fuel.
(2) If coal gaseous fuel containes CH
4, there will be some specific equivalence ratio in the primary combustion zone for the minimum NH3 conversion to NO
x.
(3) Its specific equivalence ratio in the primary combustion zone increases with de-creasing CH
4 concentration in coal gaseous fuel.
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