向晓东1,2,,
李梦玲1,
向晓晴1
1.武汉科技大学资源与环境工程学院，武汉 430081
2.武汉科技大学绿色制造工程研究院，武汉 430081
基金项目: 国家重点研发计划(2017YFC0210404)
Efficiency enhancement and drag reduction effects of bipolar electrostatic-bag filter
LI Xuee1,,XIANG Xiaodong1,2,,
LI Mengling1,
XIANG Xiaoqing1
1.School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
2.Green Manufacturing Engineering Academy, Wuhan University of Science and Technology, Wuhan 430081, China
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摘要:为提高现有电袋复合除尘器的除尘效率，降低压力损失，改进清灰效果，设计出一种线管式双极电袋复合除尘器，并对其增效减阻作用和单极电袋复合除尘器进行了对比研究。在硅微粉中位径1.74 μm、过滤风速3 m·min-1、入口粉尘浓度2 500 mg·m-3的实验条件下，双极电袋复合除尘器比单极电袋复合除尘器的粉尘透过率、压力损失分别降低25%、27%以上。为分析双极荷电粉尘的静电凝并增效作用，测定了滤料表面沉积粉尘层的粒度分布，发现单极荷电和双极荷电沉积尘的中位径分别为1.83 μm和1.92 μm，表明双极荷电粉尘具有较好的静电凝并作用，所形成的较粗团聚颗粒物不易透过滤料，使除尘效率提高。为阐明双极荷电粉尘的减阻作用，采用自然堆积法测出双极荷电粉尘的堆积密度小于单极荷电粉尘，证明粉尘双极荷电后会在滤料表面形成较蓬松的粉尘层，这将有助于降低压力损失、提高清灰效果。
关键词: 电袋复合除尘器/
单极荷电/
双极荷电/
静电凝并/
除尘器滤料压力损失
Abstract:In order to improve the particle collection, filter cleaning, and pressure drop reduction of the current electrostatic enhancement bag filter, a wire-tube bipolar electrostatic-bag filter was proposed. Then, in comparison with the unipolar electrostatic-bag filter, its efficiency enhancement and drag reduction effects were analyzed when the silicon powder with medium diameter of 1.74 μm was used. The results show that the dust penetration and pressure drop of bipolar electrostatic-bag filter decreased by over 25% and 27% at the filtration velocity of 3 m·min-1 and inlet dust concentration of 2 500 mg·m-3, respectively. To analyze efficiency enhancement effect of the electrostatic agglomeration of the bipolar charged particles, the particle size distribution of the dust layer on the surface of the fabric filter was determined. The medium diameters of unipolar charged and bipolar charged particles were 1.83 μm and 1.92 μm, respectively, which indicated that the latter presented a stronger electrostatic agglomeration effect. Therefore, the particle collection efficiency can be improved due to the difficult penetration of these coarse agglomeration particles through the fabric material. In order to clarify the drag reduction of the bipolar charged particles, the accumulation density of the particles was measured by the natural stacking method. The results showed that the accumulation density of the bipolar charged particles was less than that of the unipolar charged particles. It is proved that if the charged particles are bipolar, a fluffy dust layer can be formed on the surface of the bag. Thus, it is helpful to reduce the pressure drop and improve the filter cleaning effect.
Key words:electrostatic-bag filter/
unipolar charged particles/
bipolar charged particles/
electrostatic agglomeration/
pressure drop of filter material for dust remover.
| [1] | YAN K, LI S, FENG W, et al. Analysis and prospect on key technology of high-voltage discharge for environmental engineering study and application[J]. High Voltage Engineering, 2015, 41(8): 2528-2544. |
| [2] | ZHOU X, CAO Z, MA Y, et al. Concentrations, correlations and chemical species of PM2.5/PM10 based on published data in China: Potential implications for the revised particulate standard[J]. Chemosphere, 2016, 144: 518-526. |
| [3] | SOBCZYK A T, MARCHEWICZ A, KRUPA A, et al. Enhancement of collection efficiency for fly ash particles (PM2.5) by unipolar agglomerator in two-stage electrostatic precipitator[J]. Separation and Purification Technology, 2017, 187: 91-101. |
| [4] | KIM S, SIOUTAS C, CHANG M. Electrostatic enhancement of the collection efficiency of stainless steel fiber filters[J]. Aerosol Science and Technology, 2000, 32(3): 197-213. |
| [5] | RODRIGUES M V, BARROZO M A S, GONCALVES J A S, et al. Effect of particle electrostatic charge on aerosol filtration by a fibrous filter[J]. Powder Technology, 2017, 313: 323-331. |
| [6] | 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. |
| [7] | ARDKAPAN S R, JOHNSON M S, YAZD S, et al. Filtration efficiency of an electrostatic fibrous filter: Studying filtration dependency on ultrafine particle exposure and composition[J]. Journal of Aerosol Science, 2014, 72(3): 14-20. |
| [8] | YANG S, LEE G W. Electrostatic enhancement of collection efficiency of the fibrous filter pretreated with ionic surfactants[J]. Air Repair, 2005, 55(5): 594-603. |
| [9] | 荣伟东, 张国权. 静电强化纤维层过滤性能的研究[J]. 环境工程, 1993,11(1): 24-29. |
| [10] | LAMB G E R, CONSTANZA P A. Low-energy electrified filter system[J]. Filtration and Separation, 1980, 17(4): 319-322. |
| [11] | 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. |
| [12] | 马艳玲. AHPC型电袋复合除尘器理论研究及电场仿真[D]. 赣州：江西理工大学, 2012. |
| [13] | JAE K L, SEONG C K, JIN H S, et al. Performance evaluation of electrostatically augmented air filters coupled with a corona precharger[J]. Aerosol Science and Technology, 2001, 35(4): 785-791. |
| [14] | 朱永超, 李坚, 徐鹏. 新型电袋复合除尘器性能研究[J]. 环境工程学报, 2011, 5(9): 2091-2094. |
| [15] | ZHUANG B, ZHENG W, TAO Y. Filtration characteristics of fibrous filter following an electrostatic precipitator[J]. Journal of Electrostatics, 2016, 83: 52-62. |
| [16] | JAWOREK A, KRUPA A, CZECH T. Modern electrostatic devices and methods for exhaust gas cleaning: A brief review[J]. Journal of Electrostatics, 2007, 65(3): 133-155. |
| [17] | 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. |
| [18] | 聂衍韬, 向晓东. 横向双极电除尘器性能实验研究[J]. 环境工程, 2015, 33(1): 77-79. |
| [19] | 国家技术监督局. 粉尘物性试验方法 第3部分:堆积密度的测定 自然堆积法标准: GB/T 16913.3-1997 [S].北京: 中国标准出版社, 1998. |
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双极电袋复合除尘器的增效减阻效应
李雪娥1,,向晓东1,2,,
李梦玲1,
向晓晴1
1.武汉科技大学资源与环境工程学院，武汉 430081
2.武汉科技大学绿色制造工程研究院，武汉 430081
基金项目: 国家重点研发计划(2017YFC0210404)
关键词: 电袋复合除尘器/
单极荷电/
双极荷电/
静电凝并/
除尘器滤料压力损失
摘要:为提高现有电袋复合除尘器的除尘效率，降低压力损失，改进清灰效果，设计出一种线管式双极电袋复合除尘器，并对其增效减阻作用和单极电袋复合除尘器进行了对比研究。在硅微粉中位径1.74 μm、过滤风速3 m·min-1、入口粉尘浓度2 500 mg·m-3的实验条件下，双极电袋复合除尘器比单极电袋复合除尘器的粉尘透过率、压力损失分别降低25%、27%以上。为分析双极荷电粉尘的静电凝并增效作用，测定了滤料表面沉积粉尘层的粒度分布，发现单极荷电和双极荷电沉积尘的中位径分别为1.83 μm和1.92 μm，表明双极荷电粉尘具有较好的静电凝并作用，所形成的较粗团聚颗粒物不易透过滤料，使除尘效率提高。为阐明双极荷电粉尘的减阻作用，采用自然堆积法测出双极荷电粉尘的堆积密度小于单极荷电粉尘，证明粉尘双极荷电后会在滤料表面形成较蓬松的粉尘层，这将有助于降低压力损失、提高清灰效果。
English Abstract
Efficiency enhancement and drag reduction effects of bipolar electrostatic-bag filter
LI Xuee1,,XIANG Xiaodong1,2,,
LI Mengling1,
XIANG Xiaoqing1
1.School of Resource and Environmental Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
2.Green Manufacturing Engineering Academy, Wuhan University of Science and Technology, Wuhan 430081, China
Keywords: electrostatic-bag filter/
unipolar charged particles/
bipolar charged particles/
electrostatic agglomeration/
pressure drop of filter material for dust remover
Abstract:In order to improve the particle collection, filter cleaning, and pressure drop reduction of the current electrostatic enhancement bag filter, a wire-tube bipolar electrostatic-bag filter was proposed. Then, in comparison with the unipolar electrostatic-bag filter, its efficiency enhancement and drag reduction effects were analyzed when the silicon powder with medium diameter of 1.74 μm was used. The results show that the dust penetration and pressure drop of bipolar electrostatic-bag filter decreased by over 25% and 27% at the filtration velocity of 3 m·min-1 and inlet dust concentration of 2 500 mg·m-3, respectively. To analyze efficiency enhancement effect of the electrostatic agglomeration of the bipolar charged particles, the particle size distribution of the dust layer on the surface of the fabric filter was determined. The medium diameters of unipolar charged and bipolar charged particles were 1.83 μm and 1.92 μm, respectively, which indicated that the latter presented a stronger electrostatic agglomeration effect. Therefore, the particle collection efficiency can be improved due to the difficult penetration of these coarse agglomeration particles through the fabric material. In order to clarify the drag reduction of the bipolar charged particles, the accumulation density of the particles was measured by the natural stacking method. The results showed that the accumulation density of the bipolar charged particles was less than that of the unipolar charged particles. It is proved that if the charged particles are bipolar, a fluffy dust layer can be formed on the surface of the bag. Thus, it is helpful to reduce the pressure drop and improve the filter cleaning effect.
