湍流与化学团聚耦合促进电除尘脱除燃煤颗粒的试验研究
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摘要
在燃煤热态实验平台的基础上开展湍流与化学团聚耦合促进电除尘脱除燃煤颗粒的实验研究,通过电称低压冲击器分别测量湍流团聚、化学团聚及二者耦合作用时烟气中细颗粒数量浓度及粒径分布的变化。发现湍流与化学团聚耦合作用使颗粒团聚效率提高到59%,且随着粒径增大湍流团聚分级团聚效率从16%逐渐降低而化学团聚分级团聚效率从21%逐渐增大至50%以上。湍流与化学团聚耦合能够有效提高电除尘对细颗粒物的脱除作用,这种作用是通过促进颗粒团聚而间接实现的。此外,湍流与化学团聚有着相互促进的内在耦合机制。
On the basis of the thermal experimental platform of coal combustion, the experimental research on the coupling of turbulent and chemical agglomeration to promote the removal of coal particles by electrostatic precipitator was carried out. The changes of the concentration of fine particles and the size distribution of the fine particles in the flue gas were measured by the electrical low pressure impactor. It is found that the coupling effect of turbulent and chemical agglomeration increases the efficiency of agglomeration to59%, and with the increase of the particle size, the efficiency of the hierarchical agglomeration of the turbulent agglomeration gradually decreases from 16%, while the efficiency of the chemical agglomeration is gradually increased from 21% to over 50%. The coupling of turbulent and chemical agglomeration can effectively improve the removal effect of electrostatic precipitator on fine particles, which is indirectly achieved by promoting particle agglomeration. In addition,turbulent and chemical agglomeration interact with each other.
On the basis of the thermal experimental platform of coal combustion, the experimental research on the coupling of turbulent and chemical agglomeration to promote the removal of coal particles by electrostatic precipitator was carried out. The changes of the concentration of fine particles and the size distribution of the fine particles in the flue gas were measured by the electrical low pressure impactor. It is found that the coupling effect of turbulent and chemical agglomeration increases the efficiency of agglomeration to59%, and with the increase of the particle size, the efficiency of the hierarchical agglomeration of the turbulent agglomeration gradually decreases from 16%, while the efficiency of the chemical agglomeration is gradually increased from 21% to over 50%. The coupling of turbulent and chemical agglomeration can effectively improve the removal effect of electrostatic precipitator on fine particles, which is indirectly achieved by promoting particle agglomeration. In addition,turbulent and chemical agglomeration interact with each other.
引文
[1]Park S S,Wexler A S.Particle deposition in the pulmonary region of the human lung:multiple breath aerosol transport and deposition[J].Journal of Aerosol Science,2007,38(5):509-519.
[2]García-Nieto P J.Study of the evolution of aerosol emissions from coal-fired power plants due to coagulation,condensation,and gravitational settling and health impact[J].Journal of Environmental Management,2006,79(4):372-382.
[3]陈隆枢.袋式除尘技术对PM2.5控制的探讨[J].中国环保产业,2013(7):21-23,27.Chen Longshu.Discussion of bag hose precipitation technology on PM2.5 control[J].China Environmental Protection Industry,2013(7):21-23,27(in Chinese).
[4]刘胜强,曾毅夫,周益辉,等.细颗粒物PM2.5的控制与脱除技术[J].中国环保产业,2014(6):16-20.Liu Shengqiang,Zeng Yifu,Zhou Yihui,et al.Control of fine particulate PM2.5 and removal technique[J].China Environmental Protection Industry,2014(6):16-20(in Chinese).
[5]魏凤,张军营,王春梅,等.煤燃烧超细颗粒物团聚促进技术的研究进展[J].煤炭转化,2003,26(3):27-31,63.Wei Feng,Zhang Junying,Wang Chunmei,et al.Review of submicron particles agglomeration in coal combustion process[J].Coal Conversion,2003,26(3):27-31,63(in Chinese).
[6]李海龙,张军营,赵永椿,等.燃煤细颗粒固液团聚实验研究[J].中国电机工程学报,2009,29(29):62-66.Li Hailong,Zhang Junying,Zhao Yongchun,et al.Experimental study on solid-liquid two-phase agglomeration of fine particles from coal combustion[J].Proceedings of the CSEE,2009,29(29):62-66(in Chinese).
[7]陈俊,张军营,魏凤,等.燃煤超细颗粒物喷雾团聚的模型[J].煤炭学报,2005,30(5):632-636.Chen Jun,Zhang Junying,Wei Feng,et al.Modelling of submicron particle agglomeration in spray process from coal combustion[J].Journal of China Coal Society,2005,30(5):632-636(in Chinese).
[8]刘加勋,高继慧,高建民,等.基于快速聚沉理论的燃煤颗粒物化学团聚模型[J].煤炭学报,2009,34(10):1388-1393.Liu Jiaxun,Gao Jihui,Gao Jianmin,et al.Modelling of spray agglomeration of particles from coal combustion based on the rapid coagulation theory[J].Journal of China Coal Society,2009,34(10):1388-1393(in Chinese).
[9]盘思伟,张凯,郭沂权,等.燃煤飞灰化学团聚促进机制研究[J].热力发电,2016,45(6):19-25.Pan Siwei,Zhang Kai,Guo Yiquan,et al.Chemical agglomeration enhancement mechanism of fly ash particle and its effect on dust removal during coal combustion[J].Thermal Power Generation,2016,45(6):19-25(in Chinese).
[10]Rajniak P,Mancinelli C,Chern R T,et al.Experimental study of wet granulation in fluidized bed:impact of the binder properties on the granule morphology[J].International Journal of Pharmaceutics,2007,334(1-2):92-102.
[11]赵永椿,张军营,魏凤,等.燃煤超细颗粒物团聚促进机制的实验研究[J].化工学报,2007,58(11):2876-2881.Zhao Yongchun,Zhang Junying,Wei Feng,et al.Experimental study on agglomeration of submicron particles from coal combustion[J].Journal of Chemical Industry and Engineering(China),2007,58(11):2876-2881(in Chinese).
[12]郑建祥,许帅,王京阳.超细颗粒聚团模型及湍流聚并器聚团研究[J].中国电机工程学报,2016,36(16):4389-4395.Zheng Jianxiang,Xu Shuai,Wang Jingyang.Simulation study of ultrafine particle aggregation models and agglomerator coagulation[J].Proceedings of the CSEE,2016,36(16):4389-4395(in Chinese).
[13]许世森.细微尘粒的预团聚对旋风分离器高温除尘性能影响的实验研究[J].动力工程,1999,19(4):309-313.Xu Shisen.Experimental research on the performance of cyclone at high temperature improved by agglomerating micro-particles[J].Power Engineering,1999,19(4):309-313(in Chinese).
[14]章鹏飞,米建春,潘祖明.烟气流速和装置元件角度对细颗粒湍流聚并的影响[J].中国电机工程学报,2016,36(10):2714-2720.Zhang Pengfei,Mi Jianchun,Pan Zuming.Influences of flue-gas velocity and device-element angle on fine particle amalgamation[J].Proceedings of the CSEE,2016,36(10):2714-2720(in Chinese).
[15]章鹏飞,米建春,潘祖明.装置元件排列间距和颗粒浓度对细颗粒湍流聚并的影响[J].中国电机工程学报,2016,36(6):1625-1632.Zhang Pengfei,Mi Jianchun,Pan Zuming.Influences of elemental arrangement and particle concentration on fine particle amalgamation[J].Proceedings of the CSEE,2016,36(6):1625-1632(in Chinese).
[16]Saffman P G,Turner J S.On the collision of drops in turbulent clouds[J].Journal of Fluid Mechanics,1956,1(1):16-30.
[17]魏凤.燃煤亚微米颗粒的形成和团聚机制的研究[D].武汉:华中科技大学,2005.Wei Feng.Study on sub-micron particle formation and agglomeration mechanism from coal combustion[D].Wuhan:Huazhong University of Science and Technology,2005(in Chinese).
[18]姚刚.燃煤可吸入颗粒物声波团聚[D].南京:东南大学,2006.Yao Gang.Acoustic agglomeration of coal combustion inhalable particles[D].Nanjing:Southeast University,2006(in Chinese).
[19]陈厚涛,赵兵,章汝心,等.声波与雾化水滴联合作用增强燃煤PM2.5脱除的实验研究[J].中国电机工程学报,2009,29(2):35-40.Chen Houtao,Zhao Bing,Zhang Ruxin,et al.Experimental study on the enhancement of removing PM2.5 in coal-fired fumes under the combined effect of acoustic wave and atomized water drop[J].Proceedings of the CSEE,2009,29(2):35-40(in Chinese).
[20]于洋,孙德帅,颜培玲,等.湍流与化学团聚耦合促进燃煤细颗粒物的清除[J].环境工程学报,2017,11(11):5949-5955.Yu Yang,Sun Deshuai,Yan Peiling,et al.Removal of fine particles with coupling of turbulent and chemical agglomeration[J].Chinese Journal of Environmental Engineering,2017,11(11):5949-5955(in Chinese).
[21]颜金培,陈立奇,杨林军,等.声波与相变联合作用下细颗粒脱除的实验研究[J].中国电机工程学报,2014,34(20):3282-3288.Yan Jinpei,Chen Liqi,Yang Linjun,et al.Experimental study on removal of fine particles under the combined effect of acoustic and vapor condensation[J].Proceedings of the CSEE,2014,34(20):3282-3288(in Chinese).
[22]易红宏,郝吉明,段雷,等.电厂除尘设施对PM10排放特征影响研究[J].环境科学,2006,27(10):1921-1927.Yi Honghong,Hao Jiming,Duan Lei,et al.Influence of dust catchers on PM10 emission characteristics of power plants[J].Environmental Science,2006,27(10):1921-1927(in Chinese).
[23]Helble J J.A model for the air emissions of trace metallic elements from coal combustors equipped with electrostatic precipitators[J].Fuel Processing Technology,2000,63(2-3):125-147.
[2]García-Nieto P J.Study of the evolution of aerosol emissions from coal-fired power plants due to coagulation,condensation,and gravitational settling and health impact[J].Journal of Environmental Management,2006,79(4):372-382.
[3]陈隆枢.袋式除尘技术对PM2.5控制的探讨[J].中国环保产业,2013(7):21-23,27.Chen Longshu.Discussion of bag hose precipitation technology on PM2.5 control[J].China Environmental Protection Industry,2013(7):21-23,27(in Chinese).
[4]刘胜强,曾毅夫,周益辉,等.细颗粒物PM2.5的控制与脱除技术[J].中国环保产业,2014(6):16-20.Liu Shengqiang,Zeng Yifu,Zhou Yihui,et al.Control of fine particulate PM2.5 and removal technique[J].China Environmental Protection Industry,2014(6):16-20(in Chinese).
[5]魏凤,张军营,王春梅,等.煤燃烧超细颗粒物团聚促进技术的研究进展[J].煤炭转化,2003,26(3):27-31,63.Wei Feng,Zhang Junying,Wang Chunmei,et al.Review of submicron particles agglomeration in coal combustion process[J].Coal Conversion,2003,26(3):27-31,63(in Chinese).
[6]李海龙,张军营,赵永椿,等.燃煤细颗粒固液团聚实验研究[J].中国电机工程学报,2009,29(29):62-66.Li Hailong,Zhang Junying,Zhao Yongchun,et al.Experimental study on solid-liquid two-phase agglomeration of fine particles from coal combustion[J].Proceedings of the CSEE,2009,29(29):62-66(in Chinese).
[7]陈俊,张军营,魏凤,等.燃煤超细颗粒物喷雾团聚的模型[J].煤炭学报,2005,30(5):632-636.Chen Jun,Zhang Junying,Wei Feng,et al.Modelling of submicron particle agglomeration in spray process from coal combustion[J].Journal of China Coal Society,2005,30(5):632-636(in Chinese).
[8]刘加勋,高继慧,高建民,等.基于快速聚沉理论的燃煤颗粒物化学团聚模型[J].煤炭学报,2009,34(10):1388-1393.Liu Jiaxun,Gao Jihui,Gao Jianmin,et al.Modelling of spray agglomeration of particles from coal combustion based on the rapid coagulation theory[J].Journal of China Coal Society,2009,34(10):1388-1393(in Chinese).
[9]盘思伟,张凯,郭沂权,等.燃煤飞灰化学团聚促进机制研究[J].热力发电,2016,45(6):19-25.Pan Siwei,Zhang Kai,Guo Yiquan,et al.Chemical agglomeration enhancement mechanism of fly ash particle and its effect on dust removal during coal combustion[J].Thermal Power Generation,2016,45(6):19-25(in Chinese).
[10]Rajniak P,Mancinelli C,Chern R T,et al.Experimental study of wet granulation in fluidized bed:impact of the binder properties on the granule morphology[J].International Journal of Pharmaceutics,2007,334(1-2):92-102.
[11]赵永椿,张军营,魏凤,等.燃煤超细颗粒物团聚促进机制的实验研究[J].化工学报,2007,58(11):2876-2881.Zhao Yongchun,Zhang Junying,Wei Feng,et al.Experimental study on agglomeration of submicron particles from coal combustion[J].Journal of Chemical Industry and Engineering(China),2007,58(11):2876-2881(in Chinese).
[12]郑建祥,许帅,王京阳.超细颗粒聚团模型及湍流聚并器聚团研究[J].中国电机工程学报,2016,36(16):4389-4395.Zheng Jianxiang,Xu Shuai,Wang Jingyang.Simulation study of ultrafine particle aggregation models and agglomerator coagulation[J].Proceedings of the CSEE,2016,36(16):4389-4395(in Chinese).
[13]许世森.细微尘粒的预团聚对旋风分离器高温除尘性能影响的实验研究[J].动力工程,1999,19(4):309-313.Xu Shisen.Experimental research on the performance of cyclone at high temperature improved by agglomerating micro-particles[J].Power Engineering,1999,19(4):309-313(in Chinese).
[14]章鹏飞,米建春,潘祖明.烟气流速和装置元件角度对细颗粒湍流聚并的影响[J].中国电机工程学报,2016,36(10):2714-2720.Zhang Pengfei,Mi Jianchun,Pan Zuming.Influences of flue-gas velocity and device-element angle on fine particle amalgamation[J].Proceedings of the CSEE,2016,36(10):2714-2720(in Chinese).
[15]章鹏飞,米建春,潘祖明.装置元件排列间距和颗粒浓度对细颗粒湍流聚并的影响[J].中国电机工程学报,2016,36(6):1625-1632.Zhang Pengfei,Mi Jianchun,Pan Zuming.Influences of elemental arrangement and particle concentration on fine particle amalgamation[J].Proceedings of the CSEE,2016,36(6):1625-1632(in Chinese).
[16]Saffman P G,Turner J S.On the collision of drops in turbulent clouds[J].Journal of Fluid Mechanics,1956,1(1):16-30.
[17]魏凤.燃煤亚微米颗粒的形成和团聚机制的研究[D].武汉:华中科技大学,2005.Wei Feng.Study on sub-micron particle formation and agglomeration mechanism from coal combustion[D].Wuhan:Huazhong University of Science and Technology,2005(in Chinese).
[18]姚刚.燃煤可吸入颗粒物声波团聚[D].南京:东南大学,2006.Yao Gang.Acoustic agglomeration of coal combustion inhalable particles[D].Nanjing:Southeast University,2006(in Chinese).
[19]陈厚涛,赵兵,章汝心,等.声波与雾化水滴联合作用增强燃煤PM2.5脱除的实验研究[J].中国电机工程学报,2009,29(2):35-40.Chen Houtao,Zhao Bing,Zhang Ruxin,et al.Experimental study on the enhancement of removing PM2.5 in coal-fired fumes under the combined effect of acoustic wave and atomized water drop[J].Proceedings of the CSEE,2009,29(2):35-40(in Chinese).
[20]于洋,孙德帅,颜培玲,等.湍流与化学团聚耦合促进燃煤细颗粒物的清除[J].环境工程学报,2017,11(11):5949-5955.Yu Yang,Sun Deshuai,Yan Peiling,et al.Removal of fine particles with coupling of turbulent and chemical agglomeration[J].Chinese Journal of Environmental Engineering,2017,11(11):5949-5955(in Chinese).
[21]颜金培,陈立奇,杨林军,等.声波与相变联合作用下细颗粒脱除的实验研究[J].中国电机工程学报,2014,34(20):3282-3288.Yan Jinpei,Chen Liqi,Yang Linjun,et al.Experimental study on removal of fine particles under the combined effect of acoustic and vapor condensation[J].Proceedings of the CSEE,2014,34(20):3282-3288(in Chinese).
[22]易红宏,郝吉明,段雷,等.电厂除尘设施对PM10排放特征影响研究[J].环境科学,2006,27(10):1921-1927.Yi Honghong,Hao Jiming,Duan Lei,et al.Influence of dust catchers on PM10 emission characteristics of power plants[J].Environmental Science,2006,27(10):1921-1927(in Chinese).
[23]Helble J J.A model for the air emissions of trace metallic elements from coal combustors equipped with electrostatic precipitators[J].Fuel Processing Technology,2000,63(2-3):125-147.