水素～炭化水素混焼における窒素酸化物の発生

抄録

This study concerns with a basic research on NO_x emission from flames of the fuels consisted of H₂ and various typical hydrocarbons (CH₄, C₃H₈, C₃H₆, C₂H₂).
The NO_x emission from H₂ 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 H₂ 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 C₃H₈ to H₂ for example, the NO_x level easily decreased by 200-300ppm.
On the other hand in highly air-premixed combustion, H₂ flame was extremely lower in NO_x emission than every hydrocarbons in these experiments. In these cases the addition of hydrocabon to H₂ always caused an increase of the emission of NO_x.