同轴分层流旋流燃烧器NO_x生成特性研究

Forming characteristics of the novel co-axial stratified turbulent burner

同轴分层流旋流燃烧器是一种新型低NO_x燃烧器,可以通过1、2次风的适当配置,达到降低NO_x生成的目的。在自行开发设计的同轴旋转分层流旋流燃烧器上,对不同1、2次风旋流强度,1、2次风不同配比工况下NO_x的生成特性进行了研究。结果表明,1次风需要保持一定的旋流强度,并达到一定的水平,同时2次风配以适当的旋流强度,在一定的1次风率下,才能达到降低NO_x生成量的目的。在本文试验条件下,1次风旋流强度为0.35～0.47,同时2次风配以适当的旋流强度和1次风率,分别为1.30～1.50和33%,NO_x生成量低于其他工况。在运用旋转射流分层流原理的同时配以适当的机械方法,如增加扩口,NO_x生成与排放水平可以进一步适当降低。

The co-axialstratified swirling burner is a novel low NOx burner, which can reduce NOx forming by proper arrangement be- tween the primary and secondary air. Experiments were conducted on the co-axial stratified swirling burner designed in this paper to investi- gate NO, yielding characteristics by adjusting the swirling strength of the primary and secondary air and the ratio of primary to secomtary air. The experimental results have shown that the primary air needs to swirl and arrive at appropriate swirling intensity and the secondary air needs to set at a suitable swirling intensity so that NOx forming level can be reduced at some ratio of the primary to the total air. Under experimental conditions tested in this paper, the swirling intensity of the primary air is needed to be maintained within the range of 0.35 to 0.47, the swirling intensity of the secondary air needs to be 1.30 to 1.50, and the ratio of the primary to secondary air is 33 % , so as to get the minimum NO, yield. In addition, it is also necessary to apply proper mechanical methods, such as increasing extending port, to further reduce the NOx forming level.