高强度红外燃烧器的研究

Research on High Intensity Infrared Burner

采用金属纤维网与泡沫陶瓷板(氧化锆板)组合的头部结构,以完全预混燃烧技术改善燃烧工况,设计了一款高强度红外燃烧器。介绍燃烧器头部结构、燃烧控制系统、点火装置及火焰检测。通过冷态实验,探究了头部的阻力来源。头部阻力主要来源于金属纤维网,泡沫氧化锆板的阻力占比较小,更换不同孔隙密度的泡沫氧化锆板对头部阻力影响较小。通过热态实验,检测了过剩空气系数与污染物排放的关系。相较于金属纤维网燃烧器,在相同过剩空气系数下,CO排放始终维持较低水平,NO_(x)排放受过剩空气系数与多孔介质结构特性耦合影响。对高强度红外燃烧器的热流密度进行计算,热流密度最高可达4930 kW/m^(2),燃烧器长时间工作且过剩空气系数处于1.5左右时,能够实现较好的运行工况,达到较低的污染物排放。

A high intensity infrared burner is designed by using the combined head structure of metal fiber mesh and foam ceramic plate(zirconia plate)to improve the combustion condition by fully premixed combustion technology.The burner head structure,combustion control system,ignition device and flame detection are introduced.The source of the head resistance is explored by the cold state experiment.The head resistance mainly comes from the metal fiber mesh.The resistance of the foam zirconia plate is relatively small.The replacement of foam zirconia plate with different pore densities has little influence on the head resistance.The relationship between excess air coefficient and pollutant emission is detected by the hot state experiment.Compared with metal fiber mesh burner,under the same excess air coefficient,CO emission always maintains a low level,and NO_(x) emission is affected by the coupling of excess air coefficient and porous medium structure characteristics.The heat flux density of the high intensity infrared burner is calculated,and the maximum heat flux density can reach 4930 kW/m^(2).When the burner operates for a long time and the excess air coefficient is about 1.5,the better operation conditions and lower pollutant emission can be achieved.