电除尘器飞灰粒径表征及细颗粒降温团聚
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摘要
基于50000m~3/h实烧烟气中试系统,采用Mastersizer 2000E激光粒度分析仪和电子低压冲击仪(ELPI),首次对电除尘器飞灰几何粒径和空气动力学粒径进行全面表征。结果表明,电除尘器入口及各电场的飞灰几何粒度分布均呈双峰分布特征,各电场峰值依次右移,但末级旋转电极电场≤1μm的颗粒占比略有升高,电除尘器入口及第1~5电场飞灰几何中位径分别为6.607μm、17.378μm、2.884μm、2.577μm、2.460μm、2.480μm;温度降低,电除尘器入口飞灰几何粒度分布的双峰均右移,颗粒团聚现象明显,80℃、90℃、110℃、130℃、150℃时电除尘器入口飞灰几何中位径分别为13.183μm、10.500μm、10.171μm、6.607μm、7.586μm,从130℃降至90℃,电除尘器入口几何粒径≤1μm、≤2.5μm、≤10μm的飞灰占比分别减少了19.8%、19.2%、12.6%;不同温度时,电除尘器对空气动力学粒径0.03~10μm段颗粒的个数浓度、质量浓度均有较高脱除效率,均在75%以上,最高可达99.9%;温度降低,电除尘器进出口空气动力学粒径不同粒径段颗粒个数浓度和质量浓度均有不同程度降低,从130℃降至90℃、80℃,对应电除尘器入口PM_(2.5)团聚效率分别为46.76%、60.08%,对应电除尘器出口PM_(10)减排分别为59.80%、91.08%,PM_(2.5)减排分别为45.94%、76.22%,PM_1减排分别为40.40%、62.12%。
Based on the 50000m~3/h actual flue gas pilot test system,the Mastersizer 2000E laser particle size analyzer and electrical low pressure impactor(ELPI)were used to fully characterize the geometric particle size and aerodynamic particle size of the fly ash particles of the electrostatic precipitator(ESP)for the first time.Results showed that,the geometric size distribution of fly ash particles of ESP inlet and different electric field is bimodal distribution characteristics,which moves to the right in turn,but particles≤1μm at the end of rotating electrode electric field have a slightly higher,the fly ash particle geometric median diameter of ESP inlet and 1—5 electric field were6.607μm,17.378μm,2.884μm,2.577μm,2.460μm,2.480μm,respectively.The fly ash particles geometric size distribution bimodal of ESP inlet moves to the right when temperature was reduced,particle agglomeration phenomenon was obvious,the fly ash particle geometric median diameter of80℃,90℃,110℃,130℃,150℃for ESP inlet were 13.183μm,10.500μm,10.171μm,6.607μm,7.586μm,from 130℃to 90℃,particles ratio of≤1μm,≤2.5μm,≤10μm decreased by 19.8%,19.8%and 19.8%respectively.At different temperatures,the ESP collection efficiency of number and mass concentration for aeordynamic diameter 0.03μm to 10μm,which were all higher than 75%,and the highest was up to 99.9%.The number and mass concentration for different period of aerodynamic diameter reduced obviously,from 130℃to 90℃and 80℃,the PM_(2.5) agglomeration efficiency of mass concentration for ESP inlet were 46.76%and 46.76%respectively.The PM_(10) reduction efficiency of mass concentration for ESP outlet were 59.80%and 91.08%.PM_(2.5) reduction efficiency were45.94%and 76.22%.PM_1 reduction efficiency were 40.40%and 62.12%,respectively.
Based on the 50000m~3/h actual flue gas pilot test system,the Mastersizer 2000E laser particle size analyzer and electrical low pressure impactor(ELPI)were used to fully characterize the geometric particle size and aerodynamic particle size of the fly ash particles of the electrostatic precipitator(ESP)for the first time.Results showed that,the geometric size distribution of fly ash particles of ESP inlet and different electric field is bimodal distribution characteristics,which moves to the right in turn,but particles≤1μm at the end of rotating electrode electric field have a slightly higher,the fly ash particle geometric median diameter of ESP inlet and 1—5 electric field were6.607μm,17.378μm,2.884μm,2.577μm,2.460μm,2.480μm,respectively.The fly ash particles geometric size distribution bimodal of ESP inlet moves to the right when temperature was reduced,particle agglomeration phenomenon was obvious,the fly ash particle geometric median diameter of80℃,90℃,110℃,130℃,150℃for ESP inlet were 13.183μm,10.500μm,10.171μm,6.607μm,7.586μm,from 130℃to 90℃,particles ratio of≤1μm,≤2.5μm,≤10μm decreased by 19.8%,19.8%and 19.8%respectively.At different temperatures,the ESP collection efficiency of number and mass concentration for aeordynamic diameter 0.03μm to 10μm,which were all higher than 75%,and the highest was up to 99.9%.The number and mass concentration for different period of aerodynamic diameter reduced obviously,from 130℃to 90℃and 80℃,the PM_(2.5) agglomeration efficiency of mass concentration for ESP inlet were 46.76%and 46.76%respectively.The PM_(10) reduction efficiency of mass concentration for ESP outlet were 59.80%and 91.08%.PM_(2.5) reduction efficiency were45.94%and 76.22%.PM_1 reduction efficiency were 40.40%and 62.12%,respectively.
引文
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[5]刘忠,刘含笑,冯新新,等.湍流聚并器流场和颗粒运动轨迹模拟[J].中国电机工程学报,2012,32(14):71-75.LIU Zhong,LIU Hanxiao,FENG Xinxin,et al.Simulation for the flow field of the turbulence coalescence device and the trajectory of particles[J].Proceedings of the CSEE,2012,32(14):71-75.
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[11]郦建国,郦祝海,何毓忠,等.低低温电除尘技术的研究及应用,中国环保产业,2014(3):28-34.LI Jianguo,LI Zhuhai,HE Yuzhong,et al.Research and application on electric precipitation technology with low-low temperature[J].China Environmental Protection Industry,2014(3):28-34.
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[13]何毓忠,何海涛,胡露钧,等.低低温电除尘技术的工程应用[J].中国环保产业,2016(4):22-24HE Yuzhong,HE Haitao,HU Lujun,et al.Engineering application of electric precipitation technology with low-low temperature[J].China Environmental Protection Industry,2016(4):22-24.
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[15]刘含笑,袁建国,郦祝海,等.低低温工况下颗粒凝并机理分析及研究方法初探[J].电力与能源,2015,36(1):107-111.LIU Hanxiao,YUAN Jianguo,LI Zhuhai,et al.Tentative study on mechanism analysis and research method of particle coagulation in low-low temperature working condition[J].Power of Energy,2015,36(1):107-111.
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