煤中汞在电厂烟气中的排放特征

doi:10.11934/j.issn.1673-4831.2016.02.010

生态与农村环境学报 ›› 2016, Vol. 32 ›› Issue (2): 229-234.doi: 10.11934/j.issn.1673-4831.2016.02.010

• 西部重点矿区土地退化因素调查专题 • 上一篇下一篇

煤中汞在电厂烟气中的排放特征

张晓勇^1,2, 张金池¹, 俞美香³, 李海东⁴

1. 南京林业大学林学院, 江苏南京 210037;
2. 江苏省环境应急与事故调查中心, 江苏南京 210036;
3. 江苏省环境监测中心, 江苏南京 210036;
4. 环境保护部南京环境科学研究所, 江苏南京 210042

收稿日期:2015-11-16 出版日期:2016-03-25 发布日期:2016-04-01
通讯作者: 张金池,E-mail:zhang8811@njfu.edu.cn E-mail:zhang8811@njfu.edu.cn
作者简介:张晓勇(1980-),男,江苏淮安人,高级工程师,博士生,从事环境应急方面的工作。E-mail:zxyhj98@163.com
基金资助:
国家科技基础性工作专项(2014FY110800);江苏省环境监测科研基金(1121);林业公益性行业科研专项(201504406)

Characteristics of Emission of Mercury With Fume From Coal-Burning Power Plant

ZHANG Xiao-yong^1,2, ZHANG Jin-chi¹, YU Mei-xiang³, LI Hai-dong⁴

1. College of Forest, Nanjing Forestry University, Nanjing 210037, China;
2. Center of Environmental Emergency Response and Accident Investigation of Jiangsu Province, Nanjing 210036, China;
3. Environmental Monitoring Center of Jiangsu Province, Nanjing 210036, China;
4. Nanjing Institute of Environmental Sciences, Ministry of Environmental Protection, Nanjing 210042, China

Received:2015-11-16 Online:2016-03-25 Published:2016-04-01

摘要/Abstract

摘要：

为了解燃煤电厂烟气中汞的排放特征,选择江苏省5个地区的7家燃煤电厂,基于美国EPA 30B方法进行现场采样,分析煤中汞含量、机组容量和不同处理设施等对烟气中汞排放的影响。结果表明,煤中汞含量与电厂烟气中汞排放浓度的相关性不强,不起决定性作用;机组容量与烟气中汞排放浓度呈极显著负指数关系(P<0.01)。采用循环流化床锅炉燃烧方式且配置静电除尘器的电厂烟气中汞的脱除效率(98.9%)明显高于煤粉炉配置静电除尘器和石灰石-石膏湿法脱硫装置的脱除效率(67.5%~81.6%)。循环流化床并配置静电除尘器装置对电厂烟气中汞的脱除更有利。

关键词: 煤炭, 电厂, 烟气, 汞, 排放特征, 处理设施

Abstract:

To better understand characteristics of the system of emission of mercury with fume from coal-burning power plants, seven coal-burning power plants located in five different regions in Jiangsu Province were selected for in-situ sampling according to the USA EPA 30B approach for analysis of effects of mercury concentration in coal, generating units capacity and emission control facilities on the emission of mercury with fume. Results show that Hg concentration in the fume is not very much related to Hg content in the coal, but in significant negative exponential relation to the generating units capacity (P<0.01). It seems that the use of circulating fluidized bed boilers coupled with electrostatic precipitators is very efficient in removing mercury from the fume emitted from coal-burning power plants, reaching up to 98.9% in mercury removal efficiency, much higher than the efficiency of the use of the pulverized coal furnaces couples with electrostatic precipitators and lime-gypsum wet desulfurization equipment (67.5%-81.6%). It is, therefore, concluded that the technology of circulating fluidized bed boiler coupled with electrostatic precipitator is more efficient in removing mercury in fume emitted from coal-burning power plants.

Key words: coal, power plant, fume, mercury, emission characteristics, control facility

中图分类号:

张晓勇, 张金池, 俞美香, 李海东. 煤中汞在电厂烟气中的排放特征[J]. 生态与农村环境学报, 2016, 32(2): 229-234.

ZHANG Xiao-yong, ZHANG Jin-chi, YU Mei-xiang, LI Hai-dong. Characteristics of Emission of Mercury With Fume From Coal-Burning Power Plant[J]. Journal of Ecology and Rural Environment, 2016, 32(2): 229-234.

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煤中汞在电厂烟气中的排放特征

Characteristics of Emission of Mercury With Fume From Coal-Burning Power Plant

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