低NO_x燃气燃烧器结构设计及性能试验

Structure design and performance experiment for a low NO_x gas burner

燃气燃烧器所产生的氮氧化物以热力型和快速型为主,在分析了燃气低氮燃烧机理的基础上,融合了亚音速超混合、旋流对冲非线性动力学以及分级浓淡燃烧等技术,成功设计开发出一种低氮燃气燃烧器,并在某天然气锅炉上实施了改造。通过改造前、后的性能对比试验,分析了锅炉负荷、中心燃气和中心风以及燃气喷枪旋转偏角等关键参数对燃气燃烧器NOx排放特性的影响。结果表明,在全工况范围内,该低氮燃气燃烧器NOx排放均低于100mg/m3,满足最新的环保要求。

Nitrogen oxides emitted from gas burners are mainly thermal NOxand prompt NOx.On the basis of analyzing the combustion mechanisms in low NOx gas burner,a low NOx gas burner was designed in combination of subsonic super mixing,opposed swirl nonlinear dynamics and biased staged combustion technology.Moreover,relative retrofitting was performed on a natural gas fired boiler.By carrying out performance tests before and after the reformation,the influences of certain key parameters such as boiler load,central gas,central air flow rates and rotation angle of gas guns on NOxemission were investigated.The results reveal that,within the whole operating ranges,NOxemission from the gas burner developed above can be controlled below 100mg/m^3,which fulfills the latest environmental protection requirements.