旋流浓淡燃烧器中煤粉浓缩器对煤燃烧NO_x生成的影响

NO_x FORMATION IN SWIRL COAL BURNER WITH PULVERIZED-COAL CONCENTRATOR

应用数值模拟方法研究了旋流燃烧器中煤粉浓缩器对煤燃烧NOx 生成的影响 ,给出了热NOx 和燃料NOx 生成的详细信息 .预报结果表明 :采用作者研制的弱旋煤粉浓缩器后 ,可以大大地降低燃烧器出口区域燃料NOx 的生成 ,同时可以保持煤粉颗粒较高的燃尽率 .模拟结果也表明 ,燃烧器出口区域的NOx 生成主要是由燃料NOx 的生成机理来控制 ,热NOx 在总NOx 的生成量中所占比例不大 .因此 ,该旋流浓淡燃烧器具有高效低污染性能 .

Coal combustion and NOx formation are studied at the exit of the swirl burner with a pulverized-coal concentrator by using numerical simulation. The detailed information of thermal NOx and fuel NOx is given. The results indicate that the pulverized-coal concentrator with weak swirl can remarkably reduce fuel NOx formation and simultaneously can keep a higher burn-out rate. The results also show that NOx formation is mainly controlled by fuel NOx, and the ratio of thermal NOx to total NOx is low. Therefore the swirl burner with pulverized-coal concentrator has the performance of high efficiency and low NOx formation.