大扩张角电袋复合除尘器内多孔板组合方案试验研究
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摘要
为了改善大扩张角电袋复合除尘器入口流场速度分布,提高除尘器效率,采用不同开孔率多孔板的组合方案,对电袋复合除尘器进行了模拟试验。结果表明:入口截面相对速度偏差由84%降至21%,除尘器内各测量截面速度分布均达到标准要求;可以采用非均匀开孔率的多孔板组合方案来调节电厂电袋复合除尘器内部流场速度分布,从而增加电袋复合除尘器使用寿命,降低电袋复合除尘器维修成本,提高电袋复合除尘器效率。
To improve the dust removal efficiency and internal flow field distribution of wide-angle electrostatic-bag precipitators, simulation tests were conducted on the combination mode of perforated plates with different porosities. Results show that the relative velocity of inlet cross section was reduced from 84% to 21%, while the relative velocity deviation of measured cross-section met relevant standard requirements; the flow field distribution in an electrostatic-bag precipitator could be adjusted by adopting the combination of different non-uniformly perforated plates, thus to elongate the service life of the bag filter, reduce the maintenance cost and improve the dust removal efficiency of the composite precipitator.
To improve the dust removal efficiency and internal flow field distribution of wide-angle electrostatic-bag precipitators, simulation tests were conducted on the combination mode of perforated plates with different porosities. Results show that the relative velocity of inlet cross section was reduced from 84% to 21%, while the relative velocity deviation of measured cross-section met relevant standard requirements; the flow field distribution in an electrostatic-bag precipitator could be adjusted by adopting the combination of different non-uniformly perforated plates, thus to elongate the service life of the bag filter, reduce the maintenance cost and improve the dust removal efficiency of the composite precipitator.
引文
[1] VIJAPUR S H. Design optimization and experimental study of a wet laminar electrostatic precipitator for enhancing collection efficiency of aerosols[D]. Ohio: Ohio University, 2008.
[2] NOUI-MEHIDI M N, WU J, ?UTALO I D, et al. Velocity distribution downstream of an asymmetric wide-angle diffuser[J]. Experimental Thermal and Fluid Science, 2005, 29(6): 649-657.
[3] CHOI M K, LIM Y B, LEE H W, et al. Flow uniformizing distribution panel design based on a non-uniform porosity distribution[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2014, 130: 41-47.
[4] BARRATT D, KIM T. A banked wide-angle diffuser with application to electrostatic precipitators[J]. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2014, 229(1): 88-98.
[5] 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. XIONG Guilong, LI Shuiqing, CHEN Sheng, et al. Development of advanced electrostatic precipitation technologies for reducing PM2.5 emissions from coal-fired power plants[J]. Proceedings of the CSEE, 2015, 35(9): 2217-2223.
[6] SAHIN B, WARD-SMITH A J. The use of perforated plates to control the flow emerging from a wide-angle diffuser, with application to electrostatic precipitator design[J]. International Journal of Heat and Fluid Flow, 1987, 8(2): 124-131.
[7] SAHIN B, WARD-SMITH A J. The pressure distribution in and flow characteristics of wide-angle diffusers using perforated plates for flow control with application to electrostatic precipitators[J]. International Journal of Mechanical Sciences, 1993, 35(2): 117-127.
[8] ?AHIN B, WARD-SMITH A J, LANE D. The pressure drop and flow characteristics of wide-angle screened diffusers of large area ratio[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1995, 58(1/2): 33-50.
[9] ZHAO Tianyi, ZHANG Jili, MA Liangdong. A general structural design methodology for multi-hole orifices and its experimental application[J]. Journal of Mechanical Science and Technology, 2011, 25(9): 2237-2246.
[10] HOLT G J, MAYNES D, BLOTTER J. Cavitation at sharp edge multi-hole baffle plates[C]//ASME 2011 International Mechanical Engineering Congress and Exposition. Denver, Colorado, USA: American Society of Mechanical Engineers, 2011: 401-410.
[11] ?ZAHI E. An analysis on the pressure loss through perforated plates at moderate Reynolds numbers in turbulent flow regime[J]. Flow Measurement and Instrumentation, 2015, 43: 6-13.
[12] 刘明, 孟桂祥, 严俊杰, 等. 火电厂除尘器前烟道流场性能诊断与优化[J]. 中国电机工程学报, 2013, 33(11): 1-6. LIU Ming, MENG Guixiang, YAN Junjie, et al. Flow characteristics diagnosis and optimization for dust collectors inflow duct in thermal power plants[J]. Proceedings of the CSEE, 2013, 33(11): 1-6.
[13] 孙超凡, 龙新峰, 于兴鲁, 等. 大型电袋复合除尘器均流布置的数值模拟与研究[J]. 中国电力, 2013, 46(10): 140-145. SUN Chaofan, LONG Xinfeng, YU Xinglu, et al. Numerical simulation of airflow deflector in large electrostatic fabric precipitators[J]. Electric Power, 2013, 46(10): 140-145.
[14] 胡满银, 雷应奇. 燃煤电厂袋式除尘器[M]. 北京: 中国电力出版社, 2010.
[15] 李小海, 翁骥, 王铮, 等. 布袋除尘器喇叭口内气流均布板数值模拟[J]. 能源与节能, 2016(11): 169-170. LI Xiaohai, WENG Ji, WANG Zheng, et al. Numerical simulation of intake uniform board in the horn mouth of bag filter[J]. Energy and Conservation, 2016(11): 169-170.
[16] 杨小海. 电改电袋复合除尘器的设计与模拟[D]. 北京: 华北电力大学, 2013.
[17] 李贞, 曹辰雨, 任建兴, 等. 袋式除尘器的除尘特性分析[J]. 上海电力学院学报, 2013, 29(4): 379-382. LI Zhen, CAO Chenyu, REN Jianxing, et al. Analysis of the characteristics of bag filter in power plants[J]. Journal of Shanghai University of Electric Power, 2013, 29(4): 379-382.
[18] WARD-SMITH A J, LANE D L, REYNOLDS A J, et al. Flow regimes in wide-angle screened diffusers[J]. International Journal of Mechanical Sciences, 1991, 33(1): 41-54.
[19] MOHR M, YL?TALO S, KLIPPEL N, et al. Submicron fly ash penetration through electrostatic precipitators at two coal power plants[J]. Aerosol Science and Technology, 1996, 24(3): 191-204.
[2] NOUI-MEHIDI M N, WU J, ?UTALO I D, et al. Velocity distribution downstream of an asymmetric wide-angle diffuser[J]. Experimental Thermal and Fluid Science, 2005, 29(6): 649-657.
[3] CHOI M K, LIM Y B, LEE H W, et al. Flow uniformizing distribution panel design based on a non-uniform porosity distribution[J]. Journal of Wind Engineering and Industrial Aerodynamics, 2014, 130: 41-47.
[4] BARRATT D, KIM T. A banked wide-angle diffuser with application to electrostatic precipitators[J]. Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 2014, 229(1): 88-98.
[5] 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. XIONG Guilong, LI Shuiqing, CHEN Sheng, et al. Development of advanced electrostatic precipitation technologies for reducing PM2.5 emissions from coal-fired power plants[J]. Proceedings of the CSEE, 2015, 35(9): 2217-2223.
[6] SAHIN B, WARD-SMITH A J. The use of perforated plates to control the flow emerging from a wide-angle diffuser, with application to electrostatic precipitator design[J]. International Journal of Heat and Fluid Flow, 1987, 8(2): 124-131.
[7] SAHIN B, WARD-SMITH A J. The pressure distribution in and flow characteristics of wide-angle diffusers using perforated plates for flow control with application to electrostatic precipitators[J]. International Journal of Mechanical Sciences, 1993, 35(2): 117-127.
[8] ?AHIN B, WARD-SMITH A J, LANE D. The pressure drop and flow characteristics of wide-angle screened diffusers of large area ratio[J]. Journal of Wind Engineering and Industrial Aerodynamics, 1995, 58(1/2): 33-50.
[9] ZHAO Tianyi, ZHANG Jili, MA Liangdong. A general structural design methodology for multi-hole orifices and its experimental application[J]. Journal of Mechanical Science and Technology, 2011, 25(9): 2237-2246.
[10] HOLT G J, MAYNES D, BLOTTER J. Cavitation at sharp edge multi-hole baffle plates[C]//ASME 2011 International Mechanical Engineering Congress and Exposition. Denver, Colorado, USA: American Society of Mechanical Engineers, 2011: 401-410.
[11] ?ZAHI E. An analysis on the pressure loss through perforated plates at moderate Reynolds numbers in turbulent flow regime[J]. Flow Measurement and Instrumentation, 2015, 43: 6-13.
[12] 刘明, 孟桂祥, 严俊杰, 等. 火电厂除尘器前烟道流场性能诊断与优化[J]. 中国电机工程学报, 2013, 33(11): 1-6. LIU Ming, MENG Guixiang, YAN Junjie, et al. Flow characteristics diagnosis and optimization for dust collectors inflow duct in thermal power plants[J]. Proceedings of the CSEE, 2013, 33(11): 1-6.
[13] 孙超凡, 龙新峰, 于兴鲁, 等. 大型电袋复合除尘器均流布置的数值模拟与研究[J]. 中国电力, 2013, 46(10): 140-145. SUN Chaofan, LONG Xinfeng, YU Xinglu, et al. Numerical simulation of airflow deflector in large electrostatic fabric precipitators[J]. Electric Power, 2013, 46(10): 140-145.
[14] 胡满银, 雷应奇. 燃煤电厂袋式除尘器[M]. 北京: 中国电力出版社, 2010.
[15] 李小海, 翁骥, 王铮, 等. 布袋除尘器喇叭口内气流均布板数值模拟[J]. 能源与节能, 2016(11): 169-170. LI Xiaohai, WENG Ji, WANG Zheng, et al. Numerical simulation of intake uniform board in the horn mouth of bag filter[J]. Energy and Conservation, 2016(11): 169-170.
[16] 杨小海. 电改电袋复合除尘器的设计与模拟[D]. 北京: 华北电力大学, 2013.
[17] 李贞, 曹辰雨, 任建兴, 等. 袋式除尘器的除尘特性分析[J]. 上海电力学院学报, 2013, 29(4): 379-382. LI Zhen, CAO Chenyu, REN Jianxing, et al. Analysis of the characteristics of bag filter in power plants[J]. Journal of Shanghai University of Electric Power, 2013, 29(4): 379-382.
[18] WARD-SMITH A J, LANE D L, REYNOLDS A J, et al. Flow regimes in wide-angle screened diffusers[J]. International Journal of Mechanical Sciences, 1991, 33(1): 41-54.
[19] MOHR M, YL?TALO S, KLIPPEL N, et al. Submicron fly ash penetration through electrostatic precipitators at two coal power plants[J]. Aerosol Science and Technology, 1996, 24(3): 191-204.
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