微型燃气轮机燃烧室燃烧特性实验

Experiment on combustion characteristics of micro gas turbine combustor

针对燃气轮机低污染排放要求,在为使用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特性实验,对比分析了燃料喷口位置、数量,值班级与主燃级燃料分配比例和不同空气流量分配方式时的燃烧效率和污染物排放特性。结果表明:改变燃料喷口的位置、数量可以改变燃料与空气的混合特性,对燃烧特性产生较大的影响;值班级与主燃级燃料流量分配比例的变化,会导致各燃烧区当量比的变化,主燃级燃烧区当量比降低至0.8以下有利于降低污染物排放;通过改变燃烧室空气流量分配方式,可以降低主燃级燃烧区的当量比,使NOx排放降低至27.2 mg/m^3,燃烧效率达到98.6%。但用于掺混的空气流量的降低会使出口温度分布系数由0.21升高至0.24。

According to the requirements of low pollution emission of gas turbine, the combustion characteristic experiment was carried out on the single head experiment piece of the combustor of low emission micro gas turbine designed for the use of gas fuel. The position and quantity of the fuel nozzle, the fuel distribution ratio between the duty class and the main combustion stage, and the combustion efficiency and pollutant emission characteristics under different air flow distribution modes were compared and analyzed. Results showed that changing the position and quantity of the fuel nozzle can change the mixing characteristics of the fuel and air, yielding a great effect on the combustion characteristics;the change of the fuel flow distribution ratio between the duty class and the main combustion stage led to the change of the equivalence ratio of each combustion zone, and the reduction of the current ratio of the main combustion stage to below 0.8 was conducive to the reduction of pollutant emissions;the change of air flow distribution ratio of the combustion chamber was conducive to the reduction of pollutant emissions With this method, the equivalence ratio of the main combustion zone can be reduced, the NOx emission can be reduced to 27.2 mg/m^3, and the combustion efficiency can reach 98.6%. However, the decrease of air flow rate for mixing could increase the outlet temperature distribution coefficient from 0.21 to 0.24.