颗粒特性对超重力湿法除尘性能的影响
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摘要
工业锅炉粉尘成分复杂,颗粒物性差别很大,若采用常规除尘器,无法达到高效脱除。超重力旋转填料床是一种新型的除尘设备,能耗低,除尘效率较高。为探究粉尘颗粒物性对超重力湿法除尘性能的影响,选取吹风气锅炉粉尘和生物质锅炉粉尘两种工业锅炉粉尘,以错流旋转填料床为除尘设备,进行了除尘实验。实验分别测定了粉尘颗粒的粒径、有效密度和润湿性,并采用单因素实验方法,考察了粉尘脱除效率随超重力因子、气量和液量的变化规律。研究结果表明:从粉尘物性角度分析,两种粉尘差异较大,吹风气锅炉粉尘更适用于湿法除尘技术,相应的,在相同的操作条件下,吹风气锅炉粉尘的脱除效率高于生物质锅炉粉尘。但在各自的最适宜操作条件下,两者的脱除效率分别可达91.48%、90.23%。可见,超重力湿法除尘技术受粉尘颗粒特性的影响较小,能够高效脱除工业锅炉粉尘,应用前景广阔。
Industrial boilers have complex dust components and large differences in particle properties. If conventional dust collectors are used, they cannot be efficiently removed. High gravity rotating packed bed is a new type of dust removal equipment,which can effectively reduce energy consumption and improve dust removal efficiency. Two kinds of industrial dusts, gas boiler dust and biomass boiler dust, were studied on dust removal experiment with the cross-flow rotating packed bed used as dust removal equipment to explore the effect of particle characteristics on the performance of high gravity wet dedusting technology. The particle size, effective density and wettability of dust particles were measured in the experiment. Meanwhile, the effects of rotation speed, gas flow rate and liquid flow rate on dust removal efficiency were investigated by using single factor experimental method. The results show that there are distinctly different characteristics between the above two dusts and the gas boiler dust is more suitable for the traditional wet dust removal method. For dust removel efficiency, gas boiler dust is higher than that of biomass boiler dust under the same conditions. However, under their respective optimum operating conditions, the removal efficiency of the two dusts can reach 91.48% and 90.23%, respectively. It can be seen that the ultra-gravity wet dust removal technology is less affected by the characteristics of dust particles, and can effectively remove industrial boiler dust, and has a broad application prospect.
Industrial boilers have complex dust components and large differences in particle properties. If conventional dust collectors are used, they cannot be efficiently removed. High gravity rotating packed bed is a new type of dust removal equipment,which can effectively reduce energy consumption and improve dust removal efficiency. Two kinds of industrial dusts, gas boiler dust and biomass boiler dust, were studied on dust removal experiment with the cross-flow rotating packed bed used as dust removal equipment to explore the effect of particle characteristics on the performance of high gravity wet dedusting technology. The particle size, effective density and wettability of dust particles were measured in the experiment. Meanwhile, the effects of rotation speed, gas flow rate and liquid flow rate on dust removal efficiency were investigated by using single factor experimental method. The results show that there are distinctly different characteristics between the above two dusts and the gas boiler dust is more suitable for the traditional wet dust removal method. For dust removel efficiency, gas boiler dust is higher than that of biomass boiler dust under the same conditions. However, under their respective optimum operating conditions, the removal efficiency of the two dusts can reach 91.48% and 90.23%, respectively. It can be seen that the ultra-gravity wet dust removal technology is less affected by the characteristics of dust particles, and can effectively remove industrial boiler dust, and has a broad application prospect.
引文
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[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].J Environ Manage,2006,79(4):372-382.
[3]Yan J.Wettability of PM2.5 from combustion[J].J Southeast Univ,2006,36(5):760-764.
[4]赵炬.工业锅炉除尘器的改进[J].机械管理开发,2006(4):65-65.
[5]王桂斗.我国燃煤工业锅炉及其配套除尘设备的运行现状及管理对策[J].大众科技,2005,(4):83-84.
[6]宋伟,高欢乐,郭庆宾.电除尘器的运行因素及提效方法[C]//河南省先进制造技术学术年会,2011.
[7]耿俊峰,宋士娟,鲍静静,等.应用润湿剂促进WFGD系统脱除细颗粒物的性能[J].化工学报,2011,62(4):1086-1089.
[8]朱家骅,夏素兰,魏文韫,等.湿法除尘技术进展及变温多相流脱除PM2.5的新方法[J].化工学报,2013,64(1)155-163.
[9]Zhang L,Ninomiya Y,Yamashita T.Formation of submicron particulate matter(PM1)during coal combustion and influence of reaction temperature[J].Fuel,2006,85(10):1446-1457.
[10]尚伟,黄超,王菲.超细颗粒物PM2.5控制技术综述[J].环境科技,2008,21(2):75-78.
[11]付加,祁贵生,刘有智,等.超重力湿法脱除气体中细颗粒物研究[J].化学工程,2015,43(4):6-10.
[12]俸志荣,焦纬洲,余丽胜,等.超重力过程工程装置结构研究进展[J].过程工程学报,2016,16(3):533-540.
[13]张艳辉,柳来栓,刘有智.超重力旋转床用于烟气除尘的实验研究[J].环境工程,2003,21(6):42-43.
[14]宋云华,陈建铭,付纪文,等.旋转填充床除尘技术的研究[J].化工进展,2003,22(5):499-502.
[15]柳巍.超重力并流除尘技术的研究[D].北京:北京化工大学,2004.
[16]付加,祁贵生,刘有智,等.错流旋转填料床脱除细颗粒物研究[J].化工进展,2015,34(3):680-683.
[17]杨胜强.粉尘防治理论及技术[M].徐州:中国矿业大学出版社,2007.
[18]陈浩,骆仲泱,江建平,等.燃煤排放PM2.5及其控制脱除技术[J].科学,2013,65(6):34-37.
[19]Mohan B R,Biswas S,Meikap B C.Performance characteristics of the particulates scrubbing in a counter-current spray-column[J].Sep Purif Technol,2008,61(1):96-102.
[20]Byeon S H,Lee B K,Mohan B R.Removal of ammonia and particulate matter using a modified turbulent wet scrubbing system[J].Separation&Purification Technology,2012,98(98):221-229.
[21]Meikap B C,Biswas M N.Fly-ash removal efficiency in a modified multi-stage bubble column scrubber[J].Sep Purif Technol,2004,36(3):177-190.
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