基于吸附剂喷射的电袋除尘器烟气脱汞性能及响应特性
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摘要
为研究电袋除尘器的脱汞性能,搭建了电袋除尘器中试平台,基于吸附剂喷射的方法研究电袋除尘器脱汞的动态响应特性,分析了吸附剂种类、喷射量、反吹周期对脱汞效率的影响。结果表明:吸附剂喷入后,电袋除尘器的脱汞效率迅速提高,出口烟气汞浓度快速下降;分别喷入7种不同的吸附剂后,电袋除尘器的脱汞效率由63.3%增至85%以上,其中S_2Br_2改性的木质活性炭脱汞效率达到94.1%;当喷入S_2Br_2改性的木质活性炭浓度由3.6 mg/m~3增加至14.4 mg/m~3时,中试装置的脱汞效率由88.0%增加至95.7%;反吹周期从30 min增加至90 min,脱汞效率呈现先增大后减小的趋势。
In order to study the mercury removal performance of the Electrostatic-fabric Integrated Precipitator(EFIP),a pilot platform of the EFIP was built. Based on the method of adsorbent injection,the dynamic response characteristics of the mercury removal efficiency was studied. The effects of adsorbent types,injection quantity and backflushing cycle length on mercury removal efficiency were analyzed. The results showed that: after spraying the adsorbent,the mercury removal efficiency is rapidly increased,and the mercury concentration at the outlet of EFIP decreases immediately. With 7 different adsorbents,the mercury removal efficiency of EFIP is increased from 63.3% to more than 85%,among which the wood activated carbon modified by S_2Br_2 is the most cost-effective in mercury removal,with the efficiency of 94.1%. When the wood activated carbon modified by S_2Br_2 concentration is increased from 3.6 mg/m~3 to 14.4 mg/m~3,the mercury removal efficiency of the EFIP increases from 88.0% to 95.7%.When the backflush cycle is increased from 30 min to 90 min,the mercury removal efficiency increases first and then decreases.
In order to study the mercury removal performance of the Electrostatic-fabric Integrated Precipitator(EFIP),a pilot platform of the EFIP was built. Based on the method of adsorbent injection,the dynamic response characteristics of the mercury removal efficiency was studied. The effects of adsorbent types,injection quantity and backflushing cycle length on mercury removal efficiency were analyzed. The results showed that: after spraying the adsorbent,the mercury removal efficiency is rapidly increased,and the mercury concentration at the outlet of EFIP decreases immediately. With 7 different adsorbents,the mercury removal efficiency of EFIP is increased from 63.3% to more than 85%,among which the wood activated carbon modified by S_2Br_2 is the most cost-effective in mercury removal,with the efficiency of 94.1%. When the wood activated carbon modified by S_2Br_2 concentration is increased from 3.6 mg/m~3 to 14.4 mg/m~3,the mercury removal efficiency of the EFIP increases from 88.0% to 95.7%.When the backflush cycle is increased from 30 min to 90 min,the mercury removal efficiency increases first and then decreases.
引文
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[4] 桂本,王辉,王为,等. 燃煤电站烟气污染物协同治理技术[J]. 发电技术,2014,10: 5-9.GUI Ben,WANG Hui,WANG Wei,et al. The integrated cooperative treatment technology offlue-gas pollutant from coal-fired power plant[J],Power Generation Technology,2014,10:5-9.
[5] 任建莉,周劲松,骆仲泱,等. 燃煤电站汞排放分布及控制研究的进展[J]. 电站系统工程,2006,22(1): 44-56.REN Jian-li,ZHOU Jin-song,LUO Zhong-yang,et al. A review of mercury speciation and control for coal-fired powerplants[J]. Power System Engineering,2006,22(1): 44-56.
[6] 陈进生,袁东星,李权龙,等. 燃煤烟气净化设施对汞排放特性的影响[J]. 中国电机工程学报,2008,28(2): 72～76.CHEN Jin-sheng,YUAN Dong-xing,LI Quan-long,et al.Effect of flue-gas cleaning devices on mercury emission from coal-fired boiler[J].Proceedings of CSEE,2008,28(2): 72-76.
[7] 张迪生,谢馨. 南京某燃煤电厂汞的排放特点及分布特征[J]. 环境监测管理与技术,2014,26(3):64-67.ZHANG Di-sheng,XIE Xin.Distribution features and emission characteristics of mercury in a Nanjing coal-fired powerplant[J]. The Administration and Technique of Environmental Monitoring,2014,26(3):64-67.
[8] 郑慧敏,刘清才,王铸,等. 改性粉煤灰基吸附剂烟气脱汞[J]. 环境工程学报,2015,9(9):4453-4457.ZHENG Hui-min,LIU Qing-cai,WANG Zhu,et al.Flue gas demercuration by modified fly ash based adsorbent[J]. Chinese Journal of Environmental Engineering,2015,9(9):4453-4457.
[9] 王运军,段钰锋,杨立国,等. 燃煤电站布袋除尘器和静电除尘器脱汞性能比较[J]. 燃料化学学报,2008,36(1): 23-29.WANG Yun-jun,DUAN Yu-feng,YANG Li-guo,et al.Comparison of mercury removal characteristic between fabric filter and electrostatic precipitators of coal-fired power plants[J]. Journal of Fuel Chemistry and Technology,2008,36(1):23-29.
[10] 井鹏,王凡,朱金伟,等. 300 MW燃煤机组烟气控制装置对气态汞去除效果[J]. 环境工程学报,2015,9(1):307-311.JING Peng,WANG Fan,ZHU Jin-wei,et al.Removal of gaseous mercury for pollution control systems of two sets of 300 MW coal-firedunits[J]. Chinese Journal of Environmental Engineering,2015,9(1):307-311.
[11] YAO Q,LI S Q,XU H W,et al. Studies on formation and control of combustion particulate matter in China: Areview[J]. Energy,2009,34(9):1296-1309.
[12] ZHAO B,ZHANG Z,JIN J,et al. Simulation of mercury capture by sorbent injection using a simplifiedmodel[J]. Journal of Hazardous Materials,2009,170(2/3):1179-1185.
[13] ZHAO B,ZHANG Z,JIN J,et al. Modeling mercury speciation in combustion flue gases using support vector machine: prediction andevaluation[J]. Journal of Hazardous Materials,2010,174(1/3):244-250.
[14] 谭增强,牛国平,陈晓文,等. 载溴竹炭的脱汞特性研究[J]. 环境工程,2015(s1): 376-379,409.TAN Zeng-qing,NIU Guo-ping,CHEN Xiao-wen,et al.Removal of elemental mercury by bamboo charcoal modified byKBr[J]. Environmental Engineering,2015(s1):376-379,409.
[15] SASMAZ E,KIRCHOFER A,JEW A D,et al. Mercury chemistry on brominated activatedcarbon[J]. Fuel,2012,99(9):188-196.
[16] 李清毅,胡达清,张军,等. 超低排放脱硫塔和湿式静电对烟气污染物的协同脱除[J]. 热能动力工程,2017,32(8):138-143.LI Qing-yi,HU Da-qing,ZHANG Jun,et al.Synergistic removal of WFGD and WESP on gas pollutants with ultra low emission[J]. Journal of Engineering for Thermal Energy and Power,2017,32(8):138-143.