W火焰锅炉SCR分区混合动态调平技术及应用  

SCR Zone-Based Hybrid Dynamic Leveling Technology and Its Application for W-Flame Boiler

作　　者：许剑[1] 罗志[2] 周鑫 李文杰 黄少波[3] 常磊[2] 王晓冰[2] 牛国平[2] 张广才[2] XU Jian;LUO Zhi;ZHOU Xin;LI Wenjie;HUANG Shaobo;CHANG Lei;WANG Xiaobing;NIU Guoping;ZHANG Guangcai(China Resources Power Holdings Co.,Ltd.,Shenzhen 518001,China;Xi'an Thermal Power Research Institute Co.,Ltd.,Xi'an 710003,China;China Resources Electric(Lian Yuan)Co.,Ltd.,Loudi 417100,China)

机构地区：[1]华润电力控股有限公司,广东深圳518001 [2]西安热工研究院有限公司,陕西西安710003 [3]华润电力(涟源)有限公司,湖南娄底417100

出　　处：《中国电力》2020年第11期234-242,共9页Electric Power

基　　金：国家大气污染防治攻关联合中心资助项目(燃煤电站污染物治理成套工艺与设备评估,DQGG020602)。

摘　　要：W火焰锅炉燃用无烟煤时,即使采用低氮燃烧技术,其产生的NOx质量浓度仍可高达700~1200 mg/m^3。因此,其超低排放路线往往是“SNCR+SCR”联用。SNCR投资及运行成本高,且“SNCR+SCR”联用时,氨逃逸极易超标并导致空预器堵塞。某电厂2台330 MW的W火焰锅炉采用SCR分区混合动态调平技术及加装催化剂的方案对其SCR系统进行改造。测试结果表明,改造后,2台机组SCR均可达到超过94%的超高脱硝效率,且氨逃逸体积浓度均稳定控制在2μL/L以内,出口NOx分布均匀性良好,实现了NOx超低排放,省去了1400万元的SNCR投资及每年760万元的运行费用。相对改造前,脱除等量的NOx氨耗量下降了约19%,空预器差压长周期维持稳定。Burning anthracite in W-flame boiler inevitably results in the emission of high concentrations of NOx as much as 700~1200 mg/m^3 even with the low nitrogen combustion technology implemented.Therefore,the combination of“SNCR+SCR”is often adopted as the traditional route of ultra-low emission control.However,in addition to the high investment and operating costs,this technical route is extremely likely to cause excessive ammonia slip,which eventually leads to air preheater blockage.In this paper,the SCR transformation project of two 330 MW W-flame boilers are conducted by adopting the“SCR zone-based hybrid dynamic leveling technology”.The test results show that after the completion of the project,the SCR removal efficiencies of both boilers have been raised to more than the super high value of 94% while the ammonia escape rate is controlled under 2μL/L.In this way,not only the goal of ultra-low emission can be achieved but also 14 million RMB of the SNCR investment and 7.6 million RMB of annual operation costs is saved respectively.Besides,to remove the same amount of NOx,19% less ammonia is consumed after the transformation while the differential pressure of air preheater is still maintained stably in the long term.

关 键 词：W火焰锅炉 SCR 分区混合 动态调平 超低排放 氨逃逸 

分 类 号：X773[环境科学与工程—环境工程]