浓淡燃烧式低氮燃烧器的数值模拟

Numerical Simulation of Low Nitrogen Burner with Rich and Lean Combustion

应用CFD软件FLUENT数值模拟浓淡燃烧式低氮燃烧器燃烧和氮氧化物排放特性,分析氮氧化物生成的原因,提出通过调节燃烧器浓燃烧与淡燃烧比例能够有效地降低氮氧化物的排放。浓燃烧燃气供给量占52%,淡燃烧燃气供给量占48%时,生成的氮氧化物体积分数比较低。指出该软件建立参数化模型的计算方法适用于各类燃气锅炉。

The numerical simulation of combustion and nitrogen oxide emission characteristics of low nitrogen burner with rich and lean combustion are carried out using CFD software FLUENT. The causes for nitrogen oxide generation are analyzed. It is proposed that regulation of the rich and lean combustion ratio of the burner can effectively reduce nitrogen oxide emission. When the rich combustion gas supply accounts for 52% , and the lean combustion gas supply accounts for 48% , the resulting nitrogen oxide volume fraction is low. It is pointed out that the calculation method to build parameterized model using the software is suitable for all kinds of gas boilers.