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Experiment and mechanism analysis on improving flue gas desulfurization efficiency by electrostatic spray |
Wang Zhentao,Luo Tiqian,Chen Huilong,Li Qingli |
(School of Energy and Power Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China) |
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Abstract In order to study the plus removal efficiency by electrostatic spray and discuss the relation of mass transfer and droplets surface,charge,and movement characteristics,the experimental investigation of flue gas desulfurization was carried out by electrostatic water and lime slurry spray.SO2 absorption efficiencies with different liquid to gas ratios,Ca/S ratios and electrostatic voltages were obtained,and a maximum removal efficiency increment 10% was achieved.The results indicate that SO2 removal efficiency increases with the increasing of liquid to gas ratio,Ca/S ratio and electrostatic voltages adding,and the trend gradually becomes slower and slower.The high voltage field can improve the surface absorption characteristics and increase Ca2+ concentration on the droplets surface.Droplets surface tension minishing can reduce the mass transfer resistance between the droplets and flue gas,and droplets electrification and non-excess charge polarization enhance the mass transfer impulse force of droplets absorption SO2.Moreover,the second atomization under high elestrostatic voltages can decrease the droplets diameter and add the reacting surface.The droplets can distribute uniformity in the tower for the droplets provided with the same polarity charge.SO2 absorption efficiency improvement is the complicated result from the above factors.
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Received: 01 September 2009
Published: 30 November 2009
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[1]郝吉明,王书肖,陆永琪.燃煤SO2污染控制技术手册[M].北京:化学工业出版社,2001.[2]王贞涛.石灰浆液双流体荷电喷雾烟气脱硫理论与试验研究[D].镇江:江苏大学,2008.[3]邹晓琳,陈汇龙,金超花,等.石灰浆荷电雾化特性的试验[J].排灌机械,2007,25(3):57-60.Zou Xiaolin,Chen Huilong,Jin Chaohua,et al.Experimental study on electrostatic spraying characteristic of lime slurry[J].Drainage and Irrigation Machinery,2007,25(3):57-60.(in Chinese)[4]闻建龙,张星,王志强.荷电气固两相流动凝并特性试验[J].排灌机械,2009,27(5):337-340.Wen Jianlong,Zhang Xing,Wang Zhiqiang.Experimental study on agglomeration of charged gas-liquid two-phase flow[J].Drainage and Irrigation Machinery,2009,27(5):337-340.(in Chinese)[5]穆华.美国荷电干式脱硫系统(CDSI)[J].环境科学动态,1997(1):11-13.Mu Hua.Charged dry sorbent injection system in USA(CDSI)[J].Environmental Science Trends,1997(1):11-13.(in Chinese)[6]陈汇龙,刘新爱,袁寿其,等.荷电石灰浆雾滴吸收SO2的传质特性分析[J].江苏大学学报:自然科学版,2008,29(4):317-321.Chen Huilong,Liu Xinai,Yuan Shouqi,et al.Mass transfer mechanism of charged lime droplets and SO2[J].Journal of Jiangsu University:Natural Science Edition,2008,29(4):317-321.(in Chinese)[7]亢燕铭,李世龙.荷电喷雾脱硫实验与机理分析[J].环境科学学报,2001,21(5):538-543.Kang Yanming,Li Shilong.Experimental and theoretical analysis of flue gas desulfurization by charged water and slurry droplets[J].Acta Scientiae Circumstantiae,2001,21(5):538-543.(in Chinese)[8]陶邦彦,余鸿达.吸收剂荷电、增湿活化烟气脱硫工艺的初步分析[J].动力工程,2000,20(6):919-922.Tao Bangye,Yu Hongda.Preliminary analysis of FGD technology on absorbent charging and moistening activation[J].Power Engineering,2000,20(6):919-922.(in Chinese)[9]王贞涛,闻建龙,罗惕乾,等.荷电喷雾脱硫试验[J].江苏大学学报:自然科学版,2007,28(5):409-412.Wang Zhentao,Wen Jianlong,Luo Tiqain,et al.Experimental research on flue gas desulfurization by electrostatic spray[J].Journal of Jiangsu University:Natural Science Edition,2007,28(5):409-412.(in Chinese)[10]陈汇龙,刘新爱,邓云天,等.采用石灰浆液荷电雾化的脱硫机理试验研究[J].动力工程,2007,27(5):781-784.Chen Huilong,Liu Xinai,Deng Yuntian,et al.Experimental study on the mechanism of flue gas desulfurization by electrically charged lime slurry droplets[J].Journal of Power Engineering,2007,27(5):781-784.(in Chinese)[11]王贞涛,闻建龙,宋晓宁,等.双流体雾化荷电特性试验[J].高电压技术,2008,34(10):2172-2176.Wang Zhentao,Wen Jianlong,Song Xiaoning,et al.Experimental study on charge characteristics of two-fluid spray[J].High Voltage Engineering,2008,34(10):2172-2176.(in Chinese)[12]李荫堂,李安平,王双,等.烟气脱硫喷淋塔气体旋流实验研究[J].环境技术,2005(1):25-28.Li Yintang,Li Anping,Wang Shuang,et al.Investigation on gas spiral flow in a spray absorber of flue gas desulfurization[J].Environmental Technology,2005(1):25-28.(in Chinese)[13]鲍重光.静电技术原理[M].北京:北京理工大学出版社,1993.[14]王军锋,王贞涛,毛惠敏,等.双流体荷电喷雾结构的PIV测量[J].农业机械学报,2009,40(9):107-111.Wang Junfeng,Wang Zhentao,Mao Huimin,et al.Measurement of twin-fluid electrostatic spray structure by using PIV[J].Transactions of the Chinese Society for Agricultural Machinery,2009,40(9):107-111.(in Chinese)[15]Mattteson M J,Giardina P J.Mass transfer of sulfur dioxide to growing droplets:role of surface electrical properties[J].Environmental Science & Technology,1974,8(1):50-55.[16]王乃华,骆仲泱,高翔,等.新型半干法烟气脱硫的试验研究[J].动力工程,2003,23(4):2586-2588.Wang Naihua,Luo Zhongyang,Gao Xiang,et al.Study of new semi-dry flue gas desulfurization[J].Power Engineering,2003,23(4):2586-2588.(in Chinese) |
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