耐火材料燃气窑炉的氮氧化物减排技术研究

为降低工业燃气窑炉的NO_x排放浓度,寻找适合耐火材料燃气窑炉的氮氧化物减排的解决方案,开展了对实验室1 m^3高温梭式窑(1 800℃)和生产企业的耐火材料燃气高温隧道窑的低氮氧燃烧技术与烟气干法催化吸附的试验研究,以及对烟气组成的实测与分析。结果表明:采用低NO_x预混型高速燃烧器可从源头减少NO_x生成,燃烧产物喷出速度在100 m·s^-1以上,能显著降低高温燃气窑炉NO_x排放浓度,实现过程减排(减排量>40%),减除投资和运行费用较高的烟气脱硝负担;对于使用温度1 400℃以下的燃气窑炉使用此技术NO_x排放浓度<100 mg·m^-3;对于使用温度1 400℃以上的燃气窑炉通过源头控制、过程减排,使烟气中NO_x显著降低,末端治理再采用无机复合固体吸附剂干法催化吸附技术,可以在相对比较低的投入条件下取得理想的减排效果,NO_x排放浓度<50 mg·m^-3,实现了NO_x超低排放的要求。

NO_x emission reduction technology for refractory gas furnace

In order to reduce the NOx emission concentration of industrial gas kilns and find a solution to reduce the NOx emission suitable for refractory gas furnaces,the low nitrogen oxygen combustion technology and dry catalytic adsorption of flue gas of 1m^3 high temperature shuttle kilns in labs(1800℃)and high-temperature gas tunnel kilns in refractory production enterprises were studied,and the composition of the flue gas was determined and analyzed.The results show that adopting the low NOx premixed high-speed burner can reduce the formation of NOx,when the discharge rate of combustion products is over 100 m/s,the NOx emission concentration of high-temperature gas furnace can be significantly reduced and the process emission reduction can be realized(emission reduction>40%),reducing the burden of flue gas denitrification with high investment and operating costs.For gas furnaces with service temperature below 1400℃,the concentration of NOx emission is<100 mg/m^3 using this technology.For gas furnaces with temperature above 1400℃,the NOx concentration in the flue gas is significantly reduced by source control and process emission reduction.In addition,the dry catalytic adsorption technology with inorganic composite solid adsorbent is used during the end treatment,which can achieve an ideal emission reduction effect with a relatively low investment.The NOx emission concentration is<50 mg/m^3,realizing the ultra-low emission.