助燃空气加湿式燃气锅炉低氮排放方式研究*
Study on low nitrogen emission mode of combustion supporting air humidification gas-fired boilers
摘要：
提出了助燃空气加湿式燃气锅炉低氮排放方式及热网利用余热与强化降氮2种不同运行模式。搭建了系统实验台，研究了液气比、助燃空气含湿量、运行模式对燃气锅炉降氮效果的影响。结果表明：提高助燃空气含湿量对降低燃气锅炉氮氧化物浓度效果显著；2种运行模式均可以大幅度降低氮氧化物排放浓度，甚至比燃气锅炉排放标准最新限值还低；相比热网利用余热运行模式，强化降氮运行模式的降氮效果更明显，可达到23.1 mg/m3，可获得较高的低氮改造补贴；热网利用余热运行模式不仅可以使既有燃气锅炉达到氮氧化物排放标准，还具有较高的锅炉热效率，节能与环保的综合效益更好。
Abstract：
Puts forward a low nitrogen emission mode of combustion supporting air humidification gas-fired boiler and two different operation modes of heat supply network utilizing waste heat and strengthening nitrogen reduction. Sets up a system experimental platform, and studies the influence of liquid gas ratio, moisture content of combustion supporting air and operation mode on nitrogen reduction effect of gas-fired boiler. The results show that increasing the moisture content of combustion supporting air has a significant effect on reducing NOx concentration of gas-fired boiler. The two operation modes can significantly reduce the NOx emission concentration, even lower than the latest limit value of gas-fired boiler emission standard. Compared with the operation mode of heat supply network utilizing waste heat, the effect of strengthening nitrogen reduction operation mode is more obvious, reaching 23.1 mg/m3, which can get a higher subsidy for low nitrogen retrofit. The operation mode of heat supply network utilizing waste heat can not only make the existing gas-fired boiler meet the NOx emission standard, but also have higher boiler thermal efficiency and better comprehensive benefits of energy conservation and environmental protection.
Keywords:gas-fired boiler, nitrogen oxides, nitrogen reduction, waste heat recovery, air humidification