为降低燃气锅炉烟气中氮氧化物的排放浓度，设计开发了一种双旋流撞击式超低氮气体燃烧器。通过实验分析了过量空气系数、一二次风配比、负荷变化和旋流强度等参数对燃烧器氮氧化物排放浓度的影响规律。实验结果表明：当双旋流撞击式超低氮气体燃烧器的过量空气系数为1.3、一二次风配比为4∶〖KG-2mm〗6、满负荷运行（45 m3/h）、旋流强度Ⅰ为0.5、旋流强度Ⅱ为0时，燃烧后氮氧化物排放浓度较小（19.85 mg/m3），可达到目前国内对氮氧化物最高要求的排放标准（30 mg/m3）。

A double swirl impact type ultralow nitrogen oxide gas burner was recommended to reduce the emission concentration of nitrogen oxides in the flue gas of gas boilers.The effect of factors such as the excess air coefficient,primary and second wind ratio,load changes,and swirl strength on the NOx emissions of the burner were tested and analyzed.The experimental results show that when the excess air coefficient of the double swirl impact type ultralow nitrogen oxide gas burner is 1.3,the primary and second wind ratio is 4∶〖KG-2mm〗6,burner is at full load operation（45 m3/h）,the swirl strength I is 0.5，and the swirl strength II is 0,the nitrogen oxide emission concentration after combustion is small (19.85 mg/m3),which can meet the current highest nitrogen oxide emission standard (30 mg/m3) in China.

TK16

河南省自然科学基金（182300410133）；江苏省研究生科研与实践创新计划（SJCX19_0667）