超低排放背景下锅炉脱硝深度优化研究  

Research of Boiler Denitrification Depth Optimization Under the Background of Ultra-low Emission

作　　者：刘兵兵 Liu Bingbing(Sichuan Guang’an Power Generation Co.,LTD,Guang’an 638017,China)

机构地区：[1]四川广安发电有限责任公司,四川广安638017

出　　处：《黑龙江科学》2024年第10期60-63,共4页Heilongjiang Science

摘　　要：在火电厂NO_(x)超低排放目标下,控制锅炉出口污染物的初始排放和提高尾部烟道选择性催化还原(SCR)脱硝技术的脱硝效率、实现NO_(x)超低排放、控制SCR运行成本、保证系统安全稳定运行是锅炉深度脱硝的关键。通过数值模拟和现场烟道改造测试,对现有SCR烟道结构进行优化设计,校正了烟道速度场、NO_(x)浓度场分布的均匀性。结果表明,烟道改造后,烟道速度场、NO_(x)浓度场分布更加均匀,脱硝出口的NO_(x)浓度相对标准偏差仅为3.19%,有利于减少氨的使用量,液氨单耗平均下降15.94%,脱硝优化设备阻力增加95 Pa,改造效果较好,为锅炉脱硝深度优化提供了可借鉴的应用案例。Under the ultra-low emission of NO_(x)in thermal power plants,controlling the initial emission of boiler outlet pollutants and improving the denitrification efficiency of tail flue selective catalytic reduction(SCR)denitrification technology,while achieving ultra-low emission of NO_(x),controlling SCR operating costs and safe and stable operation of the system are the key to the current deep denitrification of boilers.Through numerical simulation and field flue transformation test,the existing SCR flue structure is optimized and the distribution uniformity of flue velocity field and NO_(x)concentration field is corrected.The results show that after the flue reconstruction,the flue velocity field and NO_(x)concentration field are more evenly distributed,and the relative standard deviation of NO_(x)concentration at the denitrification outlet is only 3.19%,which is conducive to reducing the amount of ammonia used.The average unit consumption of liquid ammonia is reduced by 15.94%.Denitration optimization equipment resistance increases by 95 Pa.The result of the transformation is good,and it provides a reference research and application case for the depth optimization of boiler denitration under the background of ultra-low emission.

关 键 词：超低排放 数值模拟 脱硝深度优化 选择性催化还原 

分 类 号：X701[环境科学与工程—环境工程] TM621[电气工程—电力系统及自动化]