Experimental Investigation of Swirl-Stabilized Syngas Flames by Transverse Fuel Injection

Syngas offers a considerable opportunity for clean use of coal in power generation applications with potential decreasing of pollutant emissions. However, there are gaps in the fundamental understanding of syngas combustion characteristics and emissions. This paper reports an experimental preliminary investigation on the effects of different parameters inward the structure and emission characteristics of syngas non-premixed flames generated on an enclosed lean premixed swirlstabilized combustor (input thermal power less to 20 kW) and equivalence ratio from 0.09 to 0.53 very lean flame giving interest to the behaviour of the syngas flame. The syngas fuel composition is a fixed mixture as 80 % H2, 4 % CH4, 10 % CO2, 4 % CO and 2 % N2. A qualitative analysis is carried out in let flame visualization by taking some direct photography to have more information about the flame. Measurements on NOx, CO emissions at the exhaust are undertaken by conventional gas analyzers. A comparison is made between syngas, GN (methane) and GN+ H2 flame emissions. Results show that the burner operates under very lean condition (below Φ = 0.1), NOx and CO emissions increase by decreasing the global equivalence ratio, and lower CO emission as compared to burning NG.