脉冲供电技术去除高阻比粉尘
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摘要
在高比电阻粉尘含量较多的环境下,荷电粉尘释放电荷速度慢,导致负电粉尘层吸附在收尘极板上而不易被振打装置所清除的反电晕现象,严重降低除尘率。提出了一种直流基础电压叠加高压脉冲的供电方案以消除电除尘器上的反电晕现象,通过研制用于消除反电晕现象的脉冲电源,在现场进行一系列除尘率受脉冲参量影响的实验研究。结果表明:叠加脉冲电源后除尘率高达98.66%,相较未叠加脉冲电源,其出口粉尘浓度降低了73.52%;其中,除尘率与脉冲的幅值、脉冲宽度和重复频率都有关。依据工况,在适当的幅值电压与重复频率之下,可以有效地消除反电晕现象,并提高除尘率,使粉尘排放浓度降低到17.31 mg·m~(-3)以下。
Under the circumstance of high content of specific resistance dust,the back corona phenomenon will be produced by the existence of charge dust that can release charge slowly. This phenomenon which lead to the negatively charged dust layer adsorbed on dust collecting plate and do not easy to be cleaned by the vibrating device may reduce the dust removal efficiency severely. In this paper,an electric power supply system which consisted of direct voltage superimposed by high voltage pulse was presented to suppress the back corona phenomenon in electrostatic precipitator. Firstly,a pulsed power supply was developed to eliminate the phenomenon of back corona. And then,the efficiency of dust collection influenced by the pulse parameters was studied in the field operation. The results showed that the dust removal efficiency with pulsed power supply was up to 98. 66%under certain conditions. Meanwhile,the dust concentration of outlet of the dust collection with pulsed power supply was declined by 73. 52% compared to the dust concentration without pulsed power supply. The result that the dust collection efficiency was related to the pulse amplitude,pulse width and repetitive frequency,respectively could also be concluded. According to the working condition,the back corona phenomenon could be eliminated efficiently under an appropriate value of the pulse amplitude and repetitive frequency. And the dust-collection efficiency was also improved with the concentration of dust emission reduced to lower than 17. 31 mg·m~(-3).
Under the circumstance of high content of specific resistance dust,the back corona phenomenon will be produced by the existence of charge dust that can release charge slowly. This phenomenon which lead to the negatively charged dust layer adsorbed on dust collecting plate and do not easy to be cleaned by the vibrating device may reduce the dust removal efficiency severely. In this paper,an electric power supply system which consisted of direct voltage superimposed by high voltage pulse was presented to suppress the back corona phenomenon in electrostatic precipitator. Firstly,a pulsed power supply was developed to eliminate the phenomenon of back corona. And then,the efficiency of dust collection influenced by the pulse parameters was studied in the field operation. The results showed that the dust removal efficiency with pulsed power supply was up to 98. 66%under certain conditions. Meanwhile,the dust concentration of outlet of the dust collection with pulsed power supply was declined by 73. 52% compared to the dust concentration without pulsed power supply. The result that the dust collection efficiency was related to the pulse amplitude,pulse width and repetitive frequency,respectively could also be concluded. According to the working condition,the back corona phenomenon could be eliminated efficiently under an appropriate value of the pulse amplitude and repetitive frequency. And the dust-collection efficiency was also improved with the concentration of dust emission reduced to lower than 17. 31 mg·m~(-3).
引文
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[12]蒋云峰,李连永,谢友金,等.ESP等用脉冲高压电源研究[C]//中国环境保护产业协会电除尘专业委员会.第15届中国电除尘学术会议论文集.蚌埠,2013
[13]陈颖悟.电除尘控制系统设计与节能算法研究[D].杭州:浙江大学,2008
[14]李济吾,李世远.收尘区脉冲供电对电除尘器收集性能的影响[J].环境工程学报,2011,5(2):399-403
[15]白敏菂,依成武,杨波,等.电除尘技术研究现状及趋势[J].环境工程学报,2007,1(8):16-19
[2]刘松涛,胡满银,李立锋,等.电除尘器反电晕现象的模拟试验研究[J].工业安全与环保,2004,30(10):21-23
[3]唐明康.高压静电场中粉尘粒子的电气性能[M].北京:化学工业出版社,2010:118-141
[4]樊兴超,姜学东,王娜.电除尘器电源交流分量对PM2.5等细微颗粒物除尘效率的影响[J].环境工程学报,2014,8(3):1146-1149
[5]李济吾,熊正明,江小华,等.电除尘器高压脉冲供电收尘技术研究[J].环境保护科学,2000,26(3):1-3
[6]王勇勤,段丽华,徐国胜,等.基于Monte-Carlo方法的静电除尘器除尘效率[J].环境工程学报,2012,6(8):2775-2781
[7]PERRON M,MALOUIN F,MOFFET H,et al.The influence of high-voltage pulse parameters on corona current in electrostatic precipitators[J].Journal of Electrostatics,2000,49(1/2):31-49
[8]赵海波,郑楚光.单区静电除尘器捕集烟尘过程的数值模拟[J].中国电机工程学报,2007,27(2):31-35
[9]唐国山.工业电除尘器应用技术[M].北京:化学工业出版社,2006:292-299
[10]邵毅敏,王洪江,熊绍武,等.粉尘对电除尘器气流分布影响仿真研究[J].环境工程学报,2009,3(3):517-520
[11]李济吾,李世远.收尘区脉冲供电对电除尘器收集性能的影响[J].环境工程学报,2011,5(2):399-403
[12]蒋云峰,李连永,谢友金,等.ESP等用脉冲高压电源研究[C]//中国环境保护产业协会电除尘专业委员会.第15届中国电除尘学术会议论文集.蚌埠,2013
[13]陈颖悟.电除尘控制系统设计与节能算法研究[D].杭州:浙江大学,2008
[14]李济吾,李世远.收尘区脉冲供电对电除尘器收集性能的影响[J].环境工程学报,2011,5(2):399-403
[15]白敏菂,依成武,杨波,等.电除尘技术研究现状及趋势[J].环境工程学报,2007,1(8):16-19
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