摘要
介绍了常温无焰燃烧技术在燃气锅炉上的应用,建立了炉膛内流动与传热的数学模型并进行了数值计算,给出了温度场和NOx浓度场分布。发现增大过量空气系数可以降低炉膛最高温度及平均温度,减小生成的NOx浓度。当过量空气系数为1.05时,锅炉热效率达到最高值,超过98%。当锅炉热负荷低于20%时,炉膛内燃烧方式接近传统有焰燃烧;当锅炉热负荷高于20%时,炉膛内燃烧方式为无焰燃烧,炉膛内温度分布均匀,NOx生成量极低,排放稳定。
Introduced the application of normal temperature air flameless combustion in gas-fired boilers. The numerical simulation of flue gas flow and heat transfer in the furnace of the boiler was carried out, which showed that the highest and average temperatures of the furnace and NOx concentration decreased with the increase of the excess air coefficient. When the excess air coefficient is 1.05, maximum of the thermal efficiency of the boiler （ over 98% ） is achieved. When the thermal load is less than 20%, the firing style in the furnace is flaming combustion. When the thermal load is higher than 20% , the firing style in the furnace is flameless combustion.
出处
《工业锅炉》
2014年第6期12-17,共6页
Industrial Boilers
关键词
无焰燃烧
NOx
锅炉热效率
热负荷
flameless combustion
NOx
boiler thermal efficiency
thermal load
