粉尘双极荷电对滤料电荷累积抑制作用
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摘要
为解决单极性电袋复合除尘器因滤料电荷积累导致清灰难和反电晕烧袋问题,将线管式双极荷电器引用到电袋复合除尘技术中。基于电晕电流最大化方法进行荷电器的电极结构优化实验。当电晕极采用RS芒刺线、管电极采用不锈钢管时,荷电器的较优极配为管电极直径25 mm、管间距120 mm、电晕线到管电极的异极距80 mm。在荷电器和导电纤维滤料组装成的静电增强纤维过滤装置上,分别进行粉尘单极荷电和非对称双极荷电情况下滤料电荷积累量的对比实验。实验粉尘采用中位径3.5μm硅微粉。在过滤风速为0.17 m·s~(-1)、平均电场强度2.5~3.0 kV·cm~(-1)的实验条件下,当气流含尘浓度为700 mg·m~(-3)时,双极荷电粉尘在滤料上累积电荷产生的电流值比单极荷电粉尘滤料上累积电荷产生的电流值低约25%,表明双极荷电对滤袋电荷积累有明显的抑制作用。
In order to solve the problem of the dust cleaning difficulty and the bag burning risk due to the charge accumulation on the fabrics in the unipolar electrostatic enhancement bag filter, a wire-tube bipolar discharger was applied. Firstly, the electrodes of the wire-tube bipolar discharger were optimized experimentally based on the corona current maximization. When the RS barbed wire and the stainless steel tube were used as the discharger electrodes,the appropriate configuration was that, the tube electrode diameter was 25 mm, the span of the tubes was 120 mm,and the distance between the wire electrodes and tube electrodes was 80 mm. Then, the comparison experiments about the charge accumulation on the conductive fabrics were carried out when the unipolar charged particles and the dissymmetric bipolar charged particles were generated by the unipolar discharger and the bipolar discharger respectively. The silicon powder with 3.5 μm medium diameter was used as the test particles. The filtration velocity was 0.17 m·s~(-1). The average electric field strength was in the range from 2.5 to 3.0 kV·cm~(-1). The results showed that the current produced by the charge accumulation of the bipolar charged particles on the fabrics was about 25%lower than that of the unipolar charged particles on the fabrics when the inlet silicon particle concentration was 700 mg·m~(-3), which indicated that the restraining effect on the charge accumulation on the fabrics was obvious when the bipolar discharging method was used.
In order to solve the problem of the dust cleaning difficulty and the bag burning risk due to the charge accumulation on the fabrics in the unipolar electrostatic enhancement bag filter, a wire-tube bipolar discharger was applied. Firstly, the electrodes of the wire-tube bipolar discharger were optimized experimentally based on the corona current maximization. When the RS barbed wire and the stainless steel tube were used as the discharger electrodes,the appropriate configuration was that, the tube electrode diameter was 25 mm, the span of the tubes was 120 mm,and the distance between the wire electrodes and tube electrodes was 80 mm. Then, the comparison experiments about the charge accumulation on the conductive fabrics were carried out when the unipolar charged particles and the dissymmetric bipolar charged particles were generated by the unipolar discharger and the bipolar discharger respectively. The silicon powder with 3.5 μm medium diameter was used as the test particles. The filtration velocity was 0.17 m·s~(-1). The average electric field strength was in the range from 2.5 to 3.0 kV·cm~(-1). The results showed that the current produced by the charge accumulation of the bipolar charged particles on the fabrics was about 25%lower than that of the unipolar charged particles on the fabrics when the inlet silicon particle concentration was 700 mg·m~(-3), which indicated that the restraining effect on the charge accumulation on the fabrics was obvious when the bipolar discharging method was used.
引文
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[18]向晓东,李梦玲,李雪娥.一种单电源横向棒帷双极荷电装置:ZL201710466767.7[P].2017-06-15.
[19]王翔,常景彩,徐纯燕,等.线-板式静电除尘器芒刺电晕线放电特性[J].高电压技术,2017,43(2):533-540.
[20]GUO B Y,GUO J,YU A B.Simulation of the electric field in wire-plate type electrostatic precipitators[J].Journal of Electrostatics,2014,72(4):301-310.DOI:10.1016/j.elstat.2014.05.005.
[21]李卓函,贺超,安毅,等.线-板式电除尘器中RS芒刺电极放电特性研究[J].中国电机工程学报,2014,34(6):925-933.
[22]LI Z H,SHAO C,XU Z Z,et al.Experimental study of electric field characteristics for barbed electrodes in wire-plate electrostatic precipitator[J].Control Engineering of China,2015,22(2):213-221.
[23]何剑,徐国胜,周孝德,等.电除尘器伏安特性规律研究[J].环境工程学报,2009,3(1):143-146.
[24]刘丽娜,丁志江,肖林,等.湿式电除尘器极配改进及性能测定[J].环境工程,2012,30(s2):203-206.
[25]龙正伟,宋蔷,李水清,等.复合式电袋除尘器的伏安特性[J].中国电机工程学报,2010,30(14):13-20.
[2]钱幺,钱晓明,邓辉,等.静电增强纤维过滤技术的研究进展[J].合成纤维工业,2016,39(1):48-52.
[3]JAWOREK A,CZECH T,RAJCH E,et al.Laboratory studies of back-discharge in fly ash[J].Journal of Electrostatics,2006,64(5):326-337.
[4]JAWOREK A,KRUP A,CZECH T.Modern electrostatic devices and methods for exhaust gas cleaning:A brief review[J].Journal of Electrostatics,2007,65(3):133-155.DOI:10.1016/j.elstat.2006.07.012.
[5]向晓东.气溶胶科学技术基础[M].北京:中国环境科学出版社,2012:162-170.
[6]黄炜,林宏,修海明,等.电袋复合除尘器若干问题的实验研究与工程实践[C]//中国环保产业协会.第十三届中国电除尘学术会议论文集.青岛,2009:492-496.
[7]郑奎照,朱召平,袁蔚凌.电袋复合除尘技术在燃煤锅炉660 MW机组上的应用[C]//中国环保产业协会.第十四届中国电除尘学术会议论文集.重庆,2011:507-510.
[8]王丽丽,王丽萍,张秀琨,等.电袋复合式除尘器的工业化应用研究[J].电力科技与环保,2008,24(5):1-4.
[9]聂孝峰,李东阳,郭斌.燃煤电厂电袋复合除尘器技术优势[J].电力科技与环保,2013,29(1):24-27.
[10]全国环保产品标准化技术委员会环境保护机械分技术委员会.电袋复合除尘器[M].北京:中国电力出版社,2015:16-17.
[11]熊桂龙,李水清,陈晟,等.增强PM2.5脱除的新型电除尘技术的发展[J].中国电机工程学报,2015,35(9):2217-2223.
[12]荣伟东,张国权,刘功智.静电增强布袋除尘器的实验研究及其应用[J].建筑热能通风空调,2003,22(2):29-31.
[13]刘功智,邓云峰,荣伟东,等.双极不对称荷电静电增强过滤除尘技术的应用[J].中国安全科学学报,2001,11(6):62-65.
[14]KANAZAWA S,OHKUBO T,NOMOTO Y,et al.Submicron particle agglomeration and precipitation by using a bipolar charging method[J].Journal of Electrostatics,1993,29(3):193-209.DOI:10.1016/0304-3886(93)90024-2.
[15]TAN B H,WANG L Z,ZHANG X R.The effect of an external DC electric field on bipolar charged aerosol agglomeration[J].Journal of Electrostatics,2007,65(2):82-86.DOI:10.1016/j.elstat.2006.07.002.
[16]向晓东,聂衍韬,丁娣.横向双极电除尘器的速度分布特征[J].工业安全与环保,2015,41(8):96-99.
[17]XIANG X D,CHANG Y F,NIE Y T.Investigation of the performance of bipolar transverse plate ESP in the sintering flue control[J].Journal of Electrostatics,2015,76:18-23.DOI:10.1016/j.elstat.2015.04.003.
[18]向晓东,李梦玲,李雪娥.一种单电源横向棒帷双极荷电装置:ZL201710466767.7[P].2017-06-15.
[19]王翔,常景彩,徐纯燕,等.线-板式静电除尘器芒刺电晕线放电特性[J].高电压技术,2017,43(2):533-540.
[20]GUO B Y,GUO J,YU A B.Simulation of the electric field in wire-plate type electrostatic precipitators[J].Journal of Electrostatics,2014,72(4):301-310.DOI:10.1016/j.elstat.2014.05.005.
[21]李卓函,贺超,安毅,等.线-板式电除尘器中RS芒刺电极放电特性研究[J].中国电机工程学报,2014,34(6):925-933.
[22]LI Z H,SHAO C,XU Z Z,et al.Experimental study of electric field characteristics for barbed electrodes in wire-plate electrostatic precipitator[J].Control Engineering of China,2015,22(2):213-221.
[23]何剑,徐国胜,周孝德,等.电除尘器伏安特性规律研究[J].环境工程学报,2009,3(1):143-146.
[24]刘丽娜,丁志江,肖林,等.湿式电除尘器极配改进及性能测定[J].环境工程,2012,30(s2):203-206.
[25]龙正伟,宋蔷,李水清,等.复合式电袋除尘器的伏安特性[J].中国电机工程学报,2010,30(14):13-20.