三层多孔板电除尘器气流均布数值研究
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摘要
气流分布均匀性对电除尘器粉尘脱除效率有着十分重要的影响,通过计算流体动力学软件Fluent对某电厂1 000 MW级机组电除尘器气流均布特性进行数值模拟研究,其中多孔板简化为多孔介质模型,流场的模拟采用k-ε双方程,数值计算采用SIMPLE算法,结果表明,在电除尘器入口喇叭口处设置三层多孔板,且开孔率设置为50%、30%、30%,气流均布性最佳;进口流速为6 m/s时,电除尘器气流均布满足合格要求,并对比了有无灰斗挡板对气流均匀性的影响,发现灰斗挡板可以有效减小灰斗内部涡流现象,提高粉尘脱除效果。
The uniformity of airflow distribution has a very important influence on the efficiency of electrostatic precipitator dust removal. Numerical simulation of airflow uniformity characteristics of electrostatic precipitator in 1 000 MW power plant of a power plant by computational fluid dynamics software Fluent. The porous plate was simplified as a porous medium. For the model,the flow field simulation adopts k-ε double equation and the numerical calculation adopts the SIMPLE algorithm. The result shows that three porous plates are set at the entrance of the bell mouth of the electrostatic precipitator,and the opening rate is set to 50%,30%,and 30%. The air distribution uniformity was the best; when the inlet flow velocity was 6 m/s,the airflow of the electrostatic precipitator was evenly distributed to meet the qualified requirements,and the effect of the presence or absence of ash baffles on the airflow uniformity was compared. It was found that the ash bucket baffle can effectively reduce the vortex phenomenon inside the ash hopper and improve the effect of dust removal.
The uniformity of airflow distribution has a very important influence on the efficiency of electrostatic precipitator dust removal. Numerical simulation of airflow uniformity characteristics of electrostatic precipitator in 1 000 MW power plant of a power plant by computational fluid dynamics software Fluent. The porous plate was simplified as a porous medium. For the model,the flow field simulation adopts k-ε double equation and the numerical calculation adopts the SIMPLE algorithm. The result shows that three porous plates are set at the entrance of the bell mouth of the electrostatic precipitator,and the opening rate is set to 50%,30%,and 30%. The air distribution uniformity was the best; when the inlet flow velocity was 6 m/s,the airflow of the electrostatic precipitator was evenly distributed to meet the qualified requirements,and the effect of the presence or absence of ash baffles on the airflow uniformity was compared. It was found that the ash bucket baffle can effectively reduce the vortex phenomenon inside the ash hopper and improve the effect of dust removal.
引文
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2刘练波,许世森.静电布袋复合除尘器的试验研究.动力工程学报,2007;27(1):103-106Liu Lianbo,Xu Shisen.Experimental study of hybrid electrostaticbag type dust collector.Journal of Power Engineering,2007;27(1):103-106
3孙超凡,邬思柯,钱炜,等.大型电袋复合除尘器除尘效率的实验研究与优化.动力工程学报,2014;34(7):534-540Sun Chaofan,Wu Sike,Qian Wei,et al.Experimental study and improvement on dust removal efficiency of electrostatic-fabric integrated precipitators.Journal of Power Engineering,2014;34(7):534-540
4党小庆,闫东杰,马广大,等.大型电除尘器气流分布数值计算的研究和应用.重型机械,2007;(1):26-29Dang Xiaoqing,Yan Dongjie,Ma Guangda,et al.Study and application of numerical calculation method for gas flow distribution of electrostatic precipitation.Heavy Machinery,2007;(1):26-29
5 Bai M H,Liu Z Q,Zhang Z M,et al.Numerical simulation of airflow in wet rotating reticular plate electrostatic precipitator.Advanced Materials Research,2012;361-363:619-622
6黄三明,李立锋,叶兴联,等.电除尘器CFD模型验证实验研究.第十四届中国电除尘学术会议论文集.重庆:国环境保护产业协会电除尘委员会,2011:10-12Huang Sanming,Li Lifeng,Ye Xinglian,et al.Experimental study on CFD model verification of electrostatic precipitator.Proceedings of the 14th China Electrostatic Precipitation Conference.Chongqing:National Environmental Protection Industry Association Electrostatic Dust Removal Committee,2011:10-12
7何剑,徐国胜,李丽梅.电除尘器气流分布模型实验研.电力环境保护,2006;22(3):40-42He Jian,Xu Guosheng,Li Limei.Experimental study on air distribution model of electrostatic precipitator.Electric Power Environmental Protection,2006;22(3):40-42
8叶兴联,郭宝玉,杨丁,等.电除尘器气流分布多尺度数值模拟方法应用.2014ANSYS中国技术大会.苏州:安世亚太科技股份有限公司,2014:5-21Ye Xinglian,Guo Baoyu,Yang Ding,et al.Application of multiscale numerical simulation method for airflow distribution in electrostatic precipitator.2014ANSYS China Technology Conference.Suzhou:Anshi Asia Pacific Technology Co.,Ltd.,2014:5-21
9赵俊起,刘同欣,张津.电除尘器气流均布装置最佳开孔率和孔形的实验研究.电力情报,2001;17(1):39-41Zhao Junqi,Liu Tongxin,Zhang Jin.Experimental study on optimum opening rate and hole shape of electrostatic precipitator air distribution device.Power Information,2001;17(1):39-41
10杨衡.提高电收尘器效率的气流流型优化与数值模拟.西安:西安建筑科技大学,2004Yang Heng.Optimization and numerical simulation of airflow pattern for improving the efficiency of electrostatic precipitator.Xi'an:Xi'an University of Architecture and Technology,2004
11焦丹,谢安国.气流分布对电除尘器影响的数值模拟.冶金能源,2011;30(3):58-61Jiao Dan,Xie Anguo.Numerical simulation on effect of the gas distribution in electrostatic precipitators.Metallurgical Energy,2011;30(3):58-61
12梁振山,隋秀兰,朱有产,等.关于电除尘器空气动力场的研究.水利电力劳动保护,1994;(3):24-26Liang Zhenshan,Sui Xiulan,Zhu Youchan,et al.Study on the aerodynamic field of electrostatic precipitator.Water Resources and electric Power Protection,1994;(3):24-26
13何剑,徐国胜.电除尘器气流分布技术研究进展.重型机械,2004;(1):5-9He Jian,Xu Guosheng.Research progress of air-flow distribution technology of electrostatic precipitator.Heavy Machinery,2004;(1):5-9
14赵海波,郑楚光.静电增强湿式除尘器的优化运行.动力工程学报,2007;27(6):954-959Zhao Haibo,Zheng Chuguang.Operation optimization of electrostatically enhanced wet scrubbers.Journal of Power Engineering,2007;27(6):954-959
15依成武.新型横向极板电除尘器研究.南京:江苏大学,2010Yi Chengwu.Stusy on new type transverse-plate ESP.Nanjing:Jiangsu University,2010
2刘练波,许世森.静电布袋复合除尘器的试验研究.动力工程学报,2007;27(1):103-106Liu Lianbo,Xu Shisen.Experimental study of hybrid electrostaticbag type dust collector.Journal of Power Engineering,2007;27(1):103-106
3孙超凡,邬思柯,钱炜,等.大型电袋复合除尘器除尘效率的实验研究与优化.动力工程学报,2014;34(7):534-540Sun Chaofan,Wu Sike,Qian Wei,et al.Experimental study and improvement on dust removal efficiency of electrostatic-fabric integrated precipitators.Journal of Power Engineering,2014;34(7):534-540
4党小庆,闫东杰,马广大,等.大型电除尘器气流分布数值计算的研究和应用.重型机械,2007;(1):26-29Dang Xiaoqing,Yan Dongjie,Ma Guangda,et al.Study and application of numerical calculation method for gas flow distribution of electrostatic precipitation.Heavy Machinery,2007;(1):26-29
5 Bai M H,Liu Z Q,Zhang Z M,et al.Numerical simulation of airflow in wet rotating reticular plate electrostatic precipitator.Advanced Materials Research,2012;361-363:619-622
6黄三明,李立锋,叶兴联,等.电除尘器CFD模型验证实验研究.第十四届中国电除尘学术会议论文集.重庆:国环境保护产业协会电除尘委员会,2011:10-12Huang Sanming,Li Lifeng,Ye Xinglian,et al.Experimental study on CFD model verification of electrostatic precipitator.Proceedings of the 14th China Electrostatic Precipitation Conference.Chongqing:National Environmental Protection Industry Association Electrostatic Dust Removal Committee,2011:10-12
7何剑,徐国胜,李丽梅.电除尘器气流分布模型实验研.电力环境保护,2006;22(3):40-42He Jian,Xu Guosheng,Li Limei.Experimental study on air distribution model of electrostatic precipitator.Electric Power Environmental Protection,2006;22(3):40-42
8叶兴联,郭宝玉,杨丁,等.电除尘器气流分布多尺度数值模拟方法应用.2014ANSYS中国技术大会.苏州:安世亚太科技股份有限公司,2014:5-21Ye Xinglian,Guo Baoyu,Yang Ding,et al.Application of multiscale numerical simulation method for airflow distribution in electrostatic precipitator.2014ANSYS China Technology Conference.Suzhou:Anshi Asia Pacific Technology Co.,Ltd.,2014:5-21
9赵俊起,刘同欣,张津.电除尘器气流均布装置最佳开孔率和孔形的实验研究.电力情报,2001;17(1):39-41Zhao Junqi,Liu Tongxin,Zhang Jin.Experimental study on optimum opening rate and hole shape of electrostatic precipitator air distribution device.Power Information,2001;17(1):39-41
10杨衡.提高电收尘器效率的气流流型优化与数值模拟.西安:西安建筑科技大学,2004Yang Heng.Optimization and numerical simulation of airflow pattern for improving the efficiency of electrostatic precipitator.Xi'an:Xi'an University of Architecture and Technology,2004
11焦丹,谢安国.气流分布对电除尘器影响的数值模拟.冶金能源,2011;30(3):58-61Jiao Dan,Xie Anguo.Numerical simulation on effect of the gas distribution in electrostatic precipitators.Metallurgical Energy,2011;30(3):58-61
12梁振山,隋秀兰,朱有产,等.关于电除尘器空气动力场的研究.水利电力劳动保护,1994;(3):24-26Liang Zhenshan,Sui Xiulan,Zhu Youchan,et al.Study on the aerodynamic field of electrostatic precipitator.Water Resources and electric Power Protection,1994;(3):24-26
13何剑,徐国胜.电除尘器气流分布技术研究进展.重型机械,2004;(1):5-9He Jian,Xu Guosheng.Research progress of air-flow distribution technology of electrostatic precipitator.Heavy Machinery,2004;(1):5-9
14赵海波,郑楚光.静电增强湿式除尘器的优化运行.动力工程学报,2007;27(6):954-959Zhao Haibo,Zheng Chuguang.Operation optimization of electrostatically enhanced wet scrubbers.Journal of Power Engineering,2007;27(6):954-959
15依成武.新型横向极板电除尘器研究.南京:江苏大学,2010Yi Chengwu.Stusy on new type transverse-plate ESP.Nanjing:Jiangsu University,2010