燃煤电厂SCR脱硝系统烟气流场优化  

Optimization of Flue Gas Flow Field in SCR Denitration System of Coal-Fired Power Plant

作　　者：尹航 顾海鹏 YIN Hang;GU Hai-peng(Hebei Weizhou Energy Comprehensive Development Co.,Ltd.)

机构地区：[1]河北蔚州能源综合开发有限公司,河北蔚县075700

出　　处：《电站系统工程》2023年第6期5-9,共5页Power System Engineering

摘　　要：针对某燃煤电厂SCR脱硝系统运行过程中出现的催化剂积灰、磨损问题,通过数值模拟的方法,优化了导流板布置方案,提升了SCR脱硝系统流场与飞灰浓度场的均匀性。结果表明:与优化前相比,喷氨格栅上游截面速度相对标准偏差由26.1%~25.7%减小至13.2%~13.0%,首层催化剂上游截面速度相对标准偏差由44.7%~48.3%减小至14.4%~14.7%。同时飞灰颗粒在烟道壁面附近富集的现象得到改善。提出的优化方案能够很好地解决原始结构下的流场不均匀问题,可为进一步解决催化剂磨损、积灰问题提供指导。The problems of catalyst abrasion and ash deposition during the operation of SCR denitration system in a coalfired power plant is focused on.Based on numerical simulation,the uniformity of flow field and fly ash concentration field of SCR denitration system was improved by optimizing the layout of baffle.The results show that,the relative standard deviation of the velocity of the upstream section of the ammonia spray grille decreased from 26.1%~25.7%to 13.2%~13.0%,compared with the original model.Similarly,the relative standard deviation of upstream section velocity of the first layer catalyst was reduced from 44.7%~48.3%to 14.4%~14.7%.At the same time,the accumulation of fly ash particles near the flue wall was solved.The study suggests that the optimization scheme can effectively solve the problem of uneven flow field under the original structure,and can provide guidance for solving the problems of catalyst abrasion and ash deposition.

关 键 词：SCR系统 催化剂磨损 流场优化 飞灰 数值模拟 

分 类 号：X701.3[环境科学与工程—环境工程]