往复多孔介质加热炉半预混燃烧混合特性研究

Study of the Semi-premixed Combustion Mixed Characteristics of a Reciprocal Porous Medium Heater

采用冷态试验和数值模拟相结合的方法研究半预混燃烧器空气燃气速度比、燃气喷口位置以及气体预热温度对燃烧室中气体混合特性的影响。冷态试验采用示踪气体法;数值模拟利用组分输出模型。研究表明,增加空气/燃气速度比使燃烧器内部燃气浓度分布更均匀,燃烧器内同一水平截面中纵向燃气浓度峰值随空气/燃气速度比增加而逐渐向燃烧器壁面移动;燃气喷口设置在气流分配装置前的混合效果要优于设置在气流分配装置后的燃气喷口;空气预热温度增加使燃烧器内部燃气浓度分布更均匀。

By using a method combining the cold-state test with the numerical simulation,studied was the influence of the airfuel gas speed ratio,fuel gas spout location and gas preheated temperature of a semi-premixed burner on the mixed characteristics of gases in the combustion chamber. The tracer gas method was adopted during the cold-state test and the component output model was used during the numerical simulation. It has been found that to increase the air / fuel gas speed ratio can make the fuel gas concentration distribution inside the burner more uniform and longitudinal fuel gas concentration peak value will gradually shift to the wall surface of the burner with an increase of the air / fuel gas speed ratio. The mixing effectiveness of the burner when the fuel gas spout is located before the gas flow distribution device is superior to that when the fuel gas spout is located after the distribution device. To increase the air preheating temperature can make the fuel gas concentration distribution inside the burner more uniform.