北京市小区集中供热燃气锅炉NOx排放现状及分析
Status and analysis of NOx emission of district central heating gas boilers in Beijing
摘要：
对北京市85台小区集中供热燃气锅炉的NOx排放情况进行了实测，测试数据表明：燃气锅炉NOx平均排放质量浓度为125 mg/m3，且25%的锅炉NOx排放质量浓度大于150 mg/m3；锅炉负荷率对NOx排放质量浓度的影响不明显；随过量空气系数增加，NOx排放浓度呈先升后降的趋势；锅炉热效率和NOx排放浓度存在对立关系。为降低集中供热燃气锅炉NOx排放量，建议采用低氮燃烧机、烟气再循环和安装脱硝装置3种措施。
Abstract：
Measures NOx emission status of eighty-five gas boilers in Beijing. The test data show that average emission mass concentration of NOx is 125 mg/m3 and the NOx emission mass concentration of 25% of boilers is greater than 150 mg/m3. The effect of boiler load factor on NOx emission concentration is not obviously. With the excess air coefficient increases, NOx emission concentration firstly increases and then decreases. Boiler thermal efficiency and NOx emission concentration are antagonistic. To reduce the NOx emission of district heating gas boiler, recommends three techniques including low nitrogen burner, flue gas recirculation and selective catalytic reduction.
Keywords:gas boiler, NOx emission concentration, district heating gas boiler, excess air coefficient, exit gas temperature