Abstract: According to the characteristics of 220 t/h coal water mixture-boiler flue gas and the demand of denitrification，Beijing Yanshan Branch Company of SINOPEC has chosen the selected catalytic reduction (SCR) technology for denitrification. The authors determined the process and design parameters by comparing different denitrification methods. The operating temperature of SCR reactor should be controlled in the range of 320—370 ℃，the volume ratio of ammonia and air should be about 5∶95，SO2 conversion ratio should be less than 1% and pressure drop should be less than 1000 Pa in the SCR reaction zone. At the same time，the concentration of NH3 in treated flue gas should be less than 3%. After construction，commissioning and testing，the denitrification effect of this project has achieved the standards prescribed by the local environmental department in Beijing. This project also has very important significance for combining foreign technology and domestic flue gas denitrification of large CWM-boiler.

Key words: coal water mixture-boiler, flue gas denitrification, selective catalytic reduction

摘要： 介绍了中国石化北京燕山分公司针对220 t/h水煤浆锅炉烟气的特点和脱硝的要求，选取了选择性催化还原（SCR）技术对该锅炉尾部烟气实施脱硝治理。通过对脱硝方案的研究，确定了脱硝的工艺流程和脱硝的有关工艺参数。SCR反应器操作温度控制在320～370 ℃范围内，氨与空气的混合体积比约为5∶95，SO2转化率小于1%，SCR反应区压降小于1000 Pa，NH3的逃逸率小于3%。项目通过建设、试运行和相关测试，锅炉的脱硝效果达到了北京市地方环保规定的标准。该项目对引进国外技术结合国内大型锅炉的特点进行锅炉烟气脱硝治理有重要意义。

关键词: 水煤浆锅炉, 烟气脱硝, 选择性催化还原法