B109 EMISSION CHARACTERISTICS AND AXIAL FLAME TEMPERATURE DISTRIBUTION OF A CIRCUMFERENTIAL REVERSE FLOW COMBUSTOR(Combustion-3)

Abstract

In partially premixed combustion of gas turbine, the combustion temperature should be lowed in order to reduce NO_x. One solution is lean premixed combustion. However, the problem is that large excess air ratio may make the combustion unstable. A novel combustor with circumferential reverse flow of fuel gas is proposed for settling this problem. A 10kw furnace is established to test performance of this combustor. Three factors such as primary air ratio, position of secondary air, total excess air ratio are studied. The emission characteristics and axial flame temperature distribution are studied. Basing on experimental results, the axial flame temperature and NO_x emission increase with primary air ratio and axial length of second stream, and decrease with total excess air ratio. When the total excess air ratio is larger than 1.05, the combustor presents a lower temperature field and much lower NO_x emission (less than 10 ppm).