水泥窑用低氮燃烧器燃烧特性的试验研究

基于水泥生产线NO_x排放机理及控制方法,设计、研发了一种新型水泥窑用低氮燃烧器,并分析了天然气、煤制气及混合气的燃烧特性及其污染物的排放特性。结果表明:在过量空气系数α为1.2、二次风占比β为0.6时,新型低氮燃烧器燃烧天然气的效果较好,NO_x排放量为53 mg/m³,CO排放量为22 mg/m³;在相同燃烧条件下,煤制气燃烧温度及NO_x排放量比天然气高,CO排放量低于天然气;在过量空气系数α为1.2、二次风占比β为0.8时,NO_x排放量为57 mg/m³,CO排放量为6 mg/m³;天然气和煤制气掺烧时,其燃烧特性介于两者之间,且掺烧煤制气可提高天然气的燃烧速率。

Experimental Study on Combustion Properties of Low Nitrogen Burner for Cement Kiln

Based on the NO_x emission mechanism and control method of the cement production line,a new low-nitrogen burner for cement kilns was developed,and the combustion characteristics of natural gas,coal-based gas,and mixed gas and the emission characteristics of their pollutants were also analyzed.The results show that,when the excess air coefficientαis 1.2 and the secondary air ratioβis 0.6,the new low-nitrogen burner has a better effect on burning natural gas,with NO_x emissions of 53 mg/m³ and CO emissions of 22 mg/m³;under the same combustion conditions,coal-to-gas combustion temperature and NO_x emissions are higher than those of natural gas,and CO emissions are lower than those of natural gas;when the excess air coefficientαis 1.2 and the secondary air ratioβis 0.8,the NO_x emissions are 57 mg/m³,CO emissions are 6 mg/m³.When natural gas and coal-based gas are blended,the combustion characteristics are between them,and the combustion rate of natural gas can be improved by blending coal-based gas.