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

Key words:

煤粉浓缩器, 数值模拟, 旋流燃烧器, 热NO_x, 燃料NO_x

摘要： 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NO_x生成的影响，给出了热NO_x和燃料NO_x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NO_x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NO_x生成主要是由燃料NO_x的生成机理来控制，热NO_x在总NO_x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.

关键词:

煤粉浓缩器, 数值模拟, 旋流燃烧器, 热NO_x, 燃料NO_x