某发电企业660 MW燃煤机组脱硫吸收塔流场优化模拟研究  

Study on Flow Field Optimization Simulation of Desulfurization Absorber for 660 MW Coal Fired Unit in a Power Plan

作　　者：郭俊海[1] 袁洪涛[1] 武彬 靳振宇[1] 王亮[1] 张其龙 李兵 董勇[3] Guo Junhai;Yuan Hongtao;Wu Bin;Jin Zhenyu;Wang Liang;Zhang Qilong;Li Bing;Dong Yong(Anhui Huadian Suzhou Power Generation Co.,Ltd.,Suzhou 234099,China;Huadian Electric Power Research Institute,Hangzhou 310030,China;National Engineering Laboratory for Reducing Emissions from Coal Combustion,Shandong University,Jinan 250061,China)

机构地区：[1]安徽华电宿州发电有限公司,安徽宿州234099 [2]华电电力科学研究院有限公司,浙江杭州310030 [3]山东大学燃煤污染物减排国家工程实验室,山东济南250061

出　　处：《山东化工》2023年第8期262-268,共7页Shandong Chemical Industry

摘　　要：为某发电企业660 MW燃煤机组脱硫吸收塔提效改造提供设计依据,对吸收塔入口烟道到机组外排口烟囱整个烟气系统开展了CFD流场优化研究。采用FLUENT软件模拟研究了脱硫塔内气液流体的流动特性,在100%机组负荷下研究了导流板设计、均流板结构参数、喷淋层喷嘴布置、除雾器布置以及吸收塔出口形式对吸收塔内速度场分布及压力损失情况。模拟结果表明:脱硫塔入、出口烟道烟气流速Cv值分别为12.62%,12.9%,均满足<15%的技术要求,整个喷淋层区域的速度分布均匀度系数均值为0.26,符合<30%的预期目标,虽然喷淋层入口、喷淋层间的等截面速度分布均匀度系数均略高于<30%的预期目标,但大致在工程允许范围内,脱硫塔顶层烟气流速均小于7 m/s。在100%机组负荷下,脱硫塔主体系统阻力损失为2177 Pa。经过优化,脱硫塔内流场分布已较为均匀,局部流速偏差较小,脱硫塔入口无回流。In order to provide the design basis for the efficiency improvement and reconstruction of the desulfurization absorber of a 660 MW coal-fired unit in a power generation enterprise,the CFD flow field optimization of the entire flue gas system from the original flue of the absorber to the chimney at the unit outlet was carried out.The flow characteristics of gas-liquid fluid in the desulfurization tower were simulated by FLUENT software,and the effects of deflector design,flow divider structure parameters,spray layer nozzle layout,demister layout and absorber outlet form on the velocity field distribution and pressure loss in the absorber were studied under 100%unit load.The results show that the flue gas velocity Cv values at the inlet and outlet of the desulfurization tower are 12.62%and 12.9%respectively,which meet the technical requirements of less than 15%;The average velocity distribution uniformity coefficient of the whole spray layer area is 0.26,meeting the expected target of<30%.Although the uniformity coefficient of constant cross-section velocity distribution at the inlet of spray layer and between spray layers is slightly higher than the expected target of<30%,it is roughly within the allowable range of the project,the flow rate of flue gas at the top of the desulfurization tower is less than 7 m/s.After optimization.Resistance loss of main system of desulfurization tower under 100%unit load is 2177 Pa.the flow field distribution in the desulfurization tower has been relatively uniform,the deviation of local flow rate is small,there is no reflux at the inlet of the desulfurization tower.

关 键 词：数值模拟 湿法脱硫 结构优化 导流板 速度分布 阻力 

分 类 号：X701[环境科学与工程—环境工程]