中国电力2017，Vol.50Issue(12)：178-184,7.DOI:10.11930/j.issn.1004-9649.201706180
燃煤电厂WESP颗粒物脱除机制及排放特征研究
Research of PM Removal Mechanism and Emission Characteristics for WESP in a Coal-Fired Power Plant
摘要
Abstract
In this paper,the WESP fine particle strengthening removal mechanism is analyzed for the first time from the aspects of strengthened charging and promoted fine particle coalescence.Then through further investigation and on-site measurement,the PM emission characteristics of WESP are studied comprehensively.The inlet and outlet particle size distribution,total dust concentration,PM10/PM2.5 concentration and SO3 concentration of WESP were measured by virtue of ELPI,filter cartridge,ELPI/PM-10 or DGI and condensation method,respectively.Based on the statistical analysis of the research and measured data,it is shown that PM10 is divided into 12 levels ranged from 0.03 μm to 10 μm by using ELPI and dust particles in each level are removed significantly using WESP with the removal efficiency of both number concentration and mass concentration exceeding 40％,and the maximum even reaching more than 90％.The outlet dust concentration of WESP is between 0.43 mg/m3 and 12.5 mg/m3,most of which is lower than 5 mg/m3.Moreover,dust removal efficiency is above 70％,with the maximum over 90％.The outlet PM2.5 concentrations of WESP are limited in the range between 0.35 mg/m3 and 1.59 mg/m3 while most of them are lower than 1 mg/m3 and PM2.5 removal efficiency is above 60％,with the maximum more than 90％.The outlet SO3 concentration of WESP is within the range between 0.10 mg/m3 and 3.21 mg/m3.SO3 removal efficiency is achieved above 60％ with the maximum more than 90％.The outlet CEMS data for three months of continuous operation of WESP of a 350 MW unit was studied and the result showed that hourly concentration control rate reached 100％.Therefore long term stable operation of the system is realized.关键词
燃煤电厂/湿式电除尘器/总尘/PM2.5/SO3Key words
coal-fired power/WESP/TSP/PM2.5/SO3分类
信息技术与安全科学引用本文复制引用
刘含笑,姚宇平,郦建国,陈招妹,方小伟..燃煤电厂WESP颗粒物脱除机制及排放特征研究[J].中国电力,2017,50(12):178-184,7.基金项目
国家国际科技合作专项(2014DFA90620) （2014DFA90620）
国家重点研发计划(2016YFC0203704 （）
2016YFC0209107 （）
2017YFB0603202)This work is supported by International Cooperation Ministry of Science and Major Project (No.2014DFA90620),National Key R&D Plan (No.2016YFC0203704,No.2016YFC0209107,No.2017YFB0603202). （No.2014DFA90620）
