燃煤热电厂烟气超低排放改造工程实践
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摘要
某燃煤热电厂采用SNCR-SCR耦合脱硝+布袋除尘+湿法石灰石-石膏烟气脱硫+湿式静电除尘的组合工艺对原烟气净化设施进行改造,以实现烟气污染物的超低排放。随机抽取1个月的污染物排放数据进行分析,结果表明:SO_2排放浓度非常低,平均浓度仅为6. 32 mg/m~3,应进一步优化控制参数实现经济运行。NO_x排放浓度稳定,98. 2%的时段排放浓度<50 mg/m~3,但氨逃逸控制不理想。经过湿法脱硫和湿式静电除尘后,96%的时段粉尘排放浓度<2. 5 mg/m~3。综合分析,组合工艺是一种适合燃煤烟气超低排放改造的可靠工艺。
A coal-fired power plant adopted SNCR-SCR + bag filter + wet limestone-gypsum flue gas desulfurization + wet electrostatics precipitation technology to retrofit the original flue gas purification facilities to achieve ultra-low emission of flue gas pollutants. Through analyzing the data of one-month pollutants emission selected randomly,the results showed that the SO_2 emission concentration was very low and the average concentration was only 6. 32 mg/m~3,but the control parameters should be further optimized to achieve economical operation. The NO_x emission concentration was stable,and its concentration was less than 50 mg/m~3 in 98. 2% of the total monitoring period. However,ammonia escape was not controlled well. After wet desulfurization and wet electrostatic precipitation,the dust emission concentration was below 2. 5 mg/m~3 in 96% of the total monitoring period. In a word,the combined technology used in this project is a suitable process for the transformation of ultralow emission for coal-fired power plants.
A coal-fired power plant adopted SNCR-SCR + bag filter + wet limestone-gypsum flue gas desulfurization + wet electrostatics precipitation technology to retrofit the original flue gas purification facilities to achieve ultra-low emission of flue gas pollutants. Through analyzing the data of one-month pollutants emission selected randomly,the results showed that the SO_2 emission concentration was very low and the average concentration was only 6. 32 mg/m~3,but the control parameters should be further optimized to achieve economical operation. The NO_x emission concentration was stable,and its concentration was less than 50 mg/m~3 in 98. 2% of the total monitoring period. However,ammonia escape was not controlled well. After wet desulfurization and wet electrostatic precipitation,the dust emission concentration was below 2. 5 mg/m~3 in 96% of the total monitoring period. In a word,the combined technology used in this project is a suitable process for the transformation of ultralow emission for coal-fired power plants.
引文
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[2]环境保护部.关于印发全面实施燃煤电厂超低排放和节能改造工作方案的通知[EB/OL]. http:∥www. Zhb. Gov. cn/gkml/hbb/bwj/201512/t20151215_319170. htm,201512-11.
[3]中华人民共和国国家发展和改革委员会.关于实行燃煤电厂超低排放电价支持政策有关问题的通知[EB/OL]. http:∥www. sdpc. gov. cn/zcfb/zcfbtz/201512/t20151209_761936. html,2015-12-02.
[4]国务院办公厅.国务院办公厅关于印发能源发展战略行动计划(2014—2020年)的通知(国办发〔2014〕31号)[Z]. 2014-06-07.
[5] Laudal D L,Thompsom J S,Pavlish J H,et al. Evaluation of mercury speciation at power plants using SCR and SCR NOxcontrol technologies[C]. 3rd International Air Quality Conference.Virginia,2002:1-15.
[6] Machalek T,Ramavajjala M,Richarson M,et al. Pilot evaluation of flue gas mercury reactions across an SCR unit[C]. Combined Power Plant Air Pollutant Control Mega Symposium. Washington,DC,2003:128-139.
[7] Kai K,Kikkawa H,Kato Y,et al. SCR catalyst with high mercury oxidation and low SO2to SO3conversion[C]. Power Plant Air Pollutant Control MEGA Symposium. Baltimore,MD,2006:266-288.
[8]赵磊,周洪光.超低排放燃煤火电机组湿式电除尘器细颗粒物脱除分析[J].中国电机工程学报,2016,36(2):468-473.
[9] Fujishima H,Maekawa N,Ohnishi S,et al. Novel electrostatic precipitation technologies in japan-colder side ESP and new wettype ESP application for boiler facilities[C], 2001 MEGA symposium. USA,2001:1-17.
[10] Meij R,Winkel H. The emissions and environmental impact of PM10and trace elements from a modern coal-fired power plant equipped with ESP and wet FGD[J]. Fuel Processing Technology,2014,85:641-656.
[11] Kikkawa H,Ishizaka E H,Kai K,et al. De NOx,De SOx,and CO2removal technology for power plant[J]. Hitachi Review,2008,57(5):174-178.
[12] Gui B,Wang H,Wang W,et al. An advanced flue gas control technology for coal-fired power plant[J]. China Electric Power(Technology Edition),2014(10):5-9.
[13] Deng H,Yi H,Tang X,et al. Adsorption equilibrium for sulfur dioxide,nitric oxide,carbon dioxide,nitrogen on 13X and 5A zeolites[J]. Chemical Engineering Journal,2012,188(15):77-85.
[14] Xiao B,Wheatley P S,Zhao X,et al. High-capacity hydrogen and nitric oxide adsorption and storage in a metal-organic framework[J]. Journal of the American Chemical Society,2007,129(5):1203-1209.
[15]环境保护部.关于发布《火电厂氮氧化物防治技术政策》的通知(环发〔2010〕10号)[Z]. 2010-01-27.
[16]国家发展改革委,环境保护部,国家能源局.关于印发《煤电节能减排升级与改造行动计划(2014—2020年)》的通知(发改能源〔2014〕2093号)[Z]. 2014-09-12.
[17]环境保护部. HJ 563—2010火电厂烟气脱硝工程技术规范:选择性非催化还原法[S].北京:中国环境科学出版社,2010.
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