濃淡同軸バーナの吹消えと排ガス特性

概要

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Blowoff and emission of methane-air rich-lean co-axial burner was tested at pressure of 0.1 MPa, temperature ranged from room temperature to 673 K, and equivalence ratio of outer gas and inner gas kept smaller than 1. Concept of rich-1ean co-axial burner is that the lower-NOx inner-flame dilutes and freezes the higher-NOx outer-flame while the lower-velocity outer-flame prevents the faster-velocity inner-flame from blowoff. It has a continuous flame surface from outer to inner, and an extinction zone between flame lip and outer rim. Results show that NOx emission measured ranged about 2 ppm, depends on φ_<avg>. Ratio of critical blowoff velocity, U_<in>/U_<out>, becomes constant if gas composition is fixed. It suggests that low NOx and stable flame region spread over wide range when φ_<avg> is kept at low value.
公益社団法人日本ガスタービン学会の論文
2002-01-21