This study concerns with a basic research on NO
x emission from flames of the fuels consisted of H
2 and various typical hydrocarbons (CH
4, C
3H
8, C
3H
6, C
2H
2).
The NO
x emission from H
2 flame significantly decreased with an increase of airpremixing, in contrast with ordinary hydrocarbons which give the more NO
x emission by the more air-premixing.
Without air premixing, linear relationships between the logarithum of NOx level and the H
2 equivalence fraction in the mixed fuel were found. There are some extent of advantageous feature of mixing combustion of H2 with some hydrocarbons for the NO
x depression. By a small addition of C
3H
8 to H
2 for example, the NO
x level easily decreased by 200-300ppm.
On the other hand in highly air-premixed combustion, H
2 flame was extremely lower in NO
x emission than every hydrocarbons in these experiments. In these cases the addition of hydrocabon to H
2 always caused an increase of the emission of NO
x.
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