摘要
利用美国EPA OH法对烟气中不同形态汞的气态汞进行测试,研究300 MW锅炉的袋式除尘、静电除尘和湿法烟气脱硫对气态汞的去除效果。研究结果表明,静电除尘器对气态汞的去除效率仅为32.50%,对颗粒态汞的去除效率达76.88%,而使用袋式除尘器对气态汞的去除效率可达44.33%,可脱除99.92%以上的颗粒态汞;应用湿法烟气脱硫对二价汞的去除率可达49.03%。通过对粉煤灰、炉渣和脱硫石膏等燃煤副产物汞含量分析发现,脱硫石膏中汞的含量最高达0.77 mg/kg,汞及其环境毒性是燃煤副产物安全利用时需要注意一个主要问题。
Mercury speciation analysis was carried out based on US EPA Ontario Hydro Method( OHM),gaseous mercury removal performance of fabric filter( FF),electrostatic precipitator( ESP),and wet flue gas desulfurization( FGD) of two sets of 300 MW coal-fired units were analyzed. The test results showed the gaseous mercury removal efficiency of 32. 50% and particulate mercury removal efficiency of 76. 88% for ESP. While mercury removal efficiency of 44. 33% and 99. 92% attained for FF for gaseous mercury and particulate mercury,respectively. For wet FGD,the removal efficiency of 49. 03% for oxide mercury was achieved. Mercury concentration of fly ash,bottom ash,and desulfurization gypsum were determined,and results showed that as high as0. 77 mg / kg for desulfurization gypsum attained,and mercury and its toxicity of coal combustion product had to be considered on its utilization.
出处
《环境工程学报》
CAS
CSCD
北大核心
2015年第1期307-311,共5页
Chinese Journal of Environmental Engineering
基金
国家"863"高技术研究发展计划项目(2012AA06A113)
环保公益性行业科研专项项目(200909025
201009048)
关键词
燃煤锅炉
除尘技术
脱汞
气态汞
coal-fired power plants
dust removal technology
mercury removal
gaseous mercury
