低低温电除尘技术适用性及污染物减排特性研究
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摘要
对国内近200种煤种的灰硫比进行了计算分析,并采用优化改进后的测试技术和方法,对低低温电除尘技术的深度提效及污染物减排特性开展了实测研究与分析。结果表明:国内绝大部分煤种的灰硫比均大于100;采用低低温电除尘技术不发生低温腐蚀风险;低低温电除尘技术可大幅降低飞灰比电阻,增大飞灰平均粒径,并提高电场起晕及击穿电压,降低烟气量及烟气流速,从而有效提高除尘效率;除尘效率可提高0.01~0.17百分点,PM2.5减排幅度可达48.3%,SO3减排幅度可达96.6%,飞灰中硫元素和硫酸根质量分数增幅明显。
An analysis was conducted on the dust/SO3 ratio of nearly 200 kinds of domestic coal,while a study was carried out on the effectiveness improvement and pollutant emission characteristics of a low-low temperature electrostatic precipitator(LLT-ESP)based on improved testing technologies.Results show that the dust/SO3 ratio of most kinds of domestic coal is above 100,in which case,no risk of low temperature corrosion would occur in the application of LLT-ESPs.The LLT-ESP technology can greatly reduce the specific resistance and improve the average particle size of fly ash,increase the electric field corona and breakdown voltage,and reduce the mass flow rate and velocity of flue gas,thus greatly improving the efficiency of the ESP,with an increase in dust removal efficiency by 0.01-0.17 percentage point,a reduction in PM2.5 emission and SO3 emission by 48.3% and 96.6%,respectively,and with a significant increase in mass fraction of sulfur element and sulfuric acid root in fly ash.
An analysis was conducted on the dust/SO3 ratio of nearly 200 kinds of domestic coal,while a study was carried out on the effectiveness improvement and pollutant emission characteristics of a low-low temperature electrostatic precipitator(LLT-ESP)based on improved testing technologies.Results show that the dust/SO3 ratio of most kinds of domestic coal is above 100,in which case,no risk of low temperature corrosion would occur in the application of LLT-ESPs.The LLT-ESP technology can greatly reduce the specific resistance and improve the average particle size of fly ash,increase the electric field corona and breakdown voltage,and reduce the mass flow rate and velocity of flue gas,thus greatly improving the efficiency of the ESP,with an increase in dust removal efficiency by 0.01-0.17 percentage point,a reduction in PM2.5 emission and SO3 emission by 48.3% and 96.6%,respectively,and with a significant increase in mass fraction of sulfur element and sulfuric acid root in fly ash.
引文
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[22]刘含笑,姚宇平,郦建国,等.超低排放下低浓度可过滤颗粒物的手工测试[J].中国粉体技术,2017,23(4):49-53.LIU Hanxiao,YAO Yuping,LI Jianguo,et al.Research of low concentration test method of PM for ultra-low emission[J].China Powder Science and Technology,2017,23(4):49-53.
[2]MORI Y,TSUMITA Y,MATSUMOTO A,et al.Operation results of IHI flue gas desulfurization system-unit No.1(1 000 MW)of Hitachinaka thermal power station for TEPCO[J].IHI Engineering Review,2006,39(1):22-26.
[3]KATO M,TANAKA T,NISHIMURA Y,et al.Method and system for handling exhaust gas in a boiler:5282429[P].1994-02-01.
[4]NAKAYAMA Y,NAKAMURA S,TAKEUCHI Y,et al.MHI high efficiency system-proven technology for multi pollutant removal[R].[S.l.]:Hiroshima Research&Development Center,2011.
[5]名嶋慎司.石炭火力用低低温電気集塵装置[J].住友重機械技報,2001,146:35-38.
[6]郦建国,郦祝海,何毓忠,等.低低温电除尘技术的研究及应用[J].中国环保产业,2014(3):28-34.LI Jianguo,LI Zhuhai,HE Yuzhong,et al.Research and application on electric precipitation technology with low-low temperature[J].China Environmental Protection Industry,2014(3):28-34.
[7]中国环境保护产业协会电除尘委员会.燃煤电厂烟气超低排放技术[M].北京:中国电力出版社,2015.
[8]郦建国,郦祝海,李卫东,等.燃煤电厂烟气协同治理技术路线研究[J].中国环保产业,2015(5):52-56.LI Jianguo,LI Zhuhai,LI Weidong,et al.Research on flue gas co-benefit control technical route in coalfired power plants[J].China Environmental Protection Industry,2015(5):52-56.
[9]胡斌,刘勇,任飞,等.低低温电除尘协同脱除细颗粒与SO3实验研究[J].中国电机工程学报,2016,36(16):4319-4325.HU Bin,LIU Yong,REN Fei,et al.Experimental study on simultaneous control of fine particle and SO3by low-low temperature electrostatic precipitator[J].Proceedings of the CSEE,2016,36(16):4319-4325.
[10]王树民,张翼,刘吉臻.燃煤电厂细颗粒物控制技术集成应用及“近零排放”特性[J].环境科学研究,2016,29(9):1256-1263.WANG Shumin,ZHANG Yi,LIU Jizhen.Integrated application of fine particulate matter control technologies and their"near-zero emission"characteristics in coal-fired power plants[J].Research of Environmental Sciences,2016,29(9):1256-1263.
[11]寿春晖,祁志福,谢尉扬,等.低低温电除尘器颗粒物脱除特性的工程应用试验研究[J].中国电机工程学报,2016,36(16):4326-4332.SHOU Chunhui,QI Zhifu,XIE Weiyang,et al.Experimental study on engineering application of particulate matter removal characteristics of low-low temperature electrostatic precipitator[J].Proceedings of the CSEE,2016,36(16):4326-4332.
[12]国家能源局.火力发电厂燃烧系统设计计算技术规程:DL/T 5240—2010[S].北京:中国标准出版社,2010.
[13]BICKELHAUPT R E,SPARKS L E.Predicting fly ash resistivity—an evaluation[J].Environment International,1981,6(1/6):211-218.
[14]陈士修,解广润.温度对电晕特性的影响[J].高电压技术,1994,20(3):3-8.CHEN Shixiu,XIE Guangrun.The effect of temperature on the corona performances[J].High Voltage Engineering,1994,20(3):3-8.
[15]高振.深度降低锅炉排烟温度对于灰颗粒物团聚和粘附特性影响的实验研究[D].济南:山东大学,2014.
[16]张绪辉.低低温电除尘器对细颗粒物及三氧化硫的协同脱除研究[D].北京:清华大学,2015.
[17]刘忠,刘含笑,冯新新,等.超细颗粒物聚并模型的比较研究[J].燃烧科学与技术,2012,18(3):212-216.LIU Zhong,LIU Hanxiao,FENG Xinxin,et al.Comparative study on the different coalescence models of ultrafine particles[J].Journal of Combustion Science and Technology,2012,18(3):212-216.
[18]刘含笑,姚宇平,郦建国.凝聚器二维单扰流柱流场中颗粒凝并模拟[J].动力工程学报,2015,35(4):292-297.LIU Hanxiao,YAO Yuping,LI Jianguo.Coagulating simulation of particles in flow field of coagulator2Dsingle turbulence column[J].Journal of Chinese Society of Power Engineering,2015,35(4):292-297.
[19]刘含笑,姚宇平,郦建国.湍流场中颗粒破碎的数值模拟[J].环境工程学报,2015,9(8):3937-3943.LIU Hanxiao,YAO Yuping,LI Jianguo.Numerical simulation of particle breakage in turbulence flow[J].Chinese Journal of Environmental Engineering,2015,9(8):3937-3943.
[20]郑建祥,许帅,王京阳.超细颗粒聚团模型及湍流聚并器聚团研究[J].中国电机工程学报,2016,36(16):4389-4395.ZHENG Jianxiang,XU Shuai,WANG Jingyang.Simulation study of ultrafine particle aggregation models and agglomerator coagulation[J].Proceedings of the CSEE,2016,36(16):4389-4395.
[21]刘含笑,姚宇平,郦建国.燃煤电厂低浓度颗粒物测试的空白实验研究[J].中国电力,2017,50(7):115-121.LIU Hanxiao,YAO Yuping,LI Jianguo.Study on blank test of low-concentration particulate matter gravimetric testing for coal-fired power plants[J].Electric Power,2017,50(7):115-121.
[22]刘含笑,姚宇平,郦建国,等.超低排放下低浓度可过滤颗粒物的手工测试[J].中国粉体技术,2017,23(4):49-53.LIU Hanxiao,YAO Yuping,LI Jianguo,et al.Research of low concentration test method of PM for ultra-low emission[J].China Powder Science and Technology,2017,23(4):49-53.