生物质气微型燃气轮机燃烧室污染物生成特性的实验研究

Experimental Study on Pollutants Formation Characteristics in a Biogas-fired Micro Gas Turbine Combustor

在为中低热值气体燃料设计的低排放微型燃气轮机燃烧室单头部实验件上进行了燃烧污染物生成特性实验,对比分析不同热值气体燃料、不同喷射孔位置和射流深度以及不同值班级与主燃级燃料分配比例时的污染物排放特性。结果表明:燃烧室在50%~100%负荷范围内表现出较好的燃料适应性,NOx排放质量浓度最高达到76.9 mg/m^3,满足环保要求;喷嘴位置、混合距离、主燃级燃料压力会影响燃料与空气的混合均匀性,进而影响污染物的生成;燃料分配比例会影响燃烧室温度分布的均匀性,随着值班级燃烧区燃料占比的降低,污染物排放量降低。

An experimental study was conducted on the pollutants formation characteristics in a single-head combustor designed for the low-emission micro gas turbine combustor using medium and low calorific value gas fuels, while a comparative analysis was carried out on the effects of gas fuel category, injector location, jet depth and pilot-to-main fuel staged ratio on the pollutants emission behavior. Results show that the combustor has good fuel adaptability in the load range of 50%-100%. The maximum NOx emission is 76.9 mg/m^3, which meets the requirements of environmental protection. The nozzle position, mixing distance and main fuel pressure would affect the mixing uniformity of fuel and air, and then affect the formation of pollutants. The change of pilot-to-main fuel staged ratio would affect the uniformity of temperature distribution in the combustor, and the pollutants emission reduces with the decrease of fuel fraction in pilot stage.