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飞灰在热处理过程中汞的逸出特性

刘 青,石 林   

  1. 华南理工大学环境科学与工程学院
  • 出版日期:2010-06-05 发布日期:2010-06-05

Emission characteristic of mercury from fly ash during thermal treatment

LIU Qing,SHI Lin   

  1. College of Environmental Science and Technology,South China University of Technology
  • Online:2010-06-05 Published:2010-06-05

摘要: 采用安大略水法(OHM)对采自广州珠江电厂(1#)和广州石化总厂第一电场、第二电场(2#、3#)的燃煤飞灰在热处理过程中逸出的零价汞(Hg0)和二价汞(Hg2+)进行分析,选取不同温度(200 ℃、400 ℃、600 ℃、800 ℃、1000℃)、时间(30 min、60 min、90 min、160 min)测定Hg2+和Hg0的逸出量。结果表明:每克飞灰在加热过程中Hg2+的逸出量为1.955~669.87 ng,Hg0的逸出量为14.53~3501.15 ng。在加热60 min后,两种形态的汞几乎完全逸出,Hg2+在600 ℃时逸出量达到最大(3#除外),Hg0在400 ℃时逸出量达到最大。在飞灰热处理过程中,汞的逸出量与飞灰所含的未燃尽炭量成正比关系。

Abstract: The emission characteristic of oxidized and elemental mercury from fly ashes collected from Guangzhou Pearl River Power Plant(1#)and the First(2#)Second(3#)Electric Fields of Guangzhou Petrochemical Plant was investigated during thermal treatment using Ontario Hydro Methods(OHM). Under different calcination temperature(200 ℃,400 ℃,600 ℃,800 ℃ and 1000 ℃),and different calcination time(30 min,60 min,90 min and 160 min),the emission amount of oxidized and elemental mercury from the fly ashes was determined subsequently. Results showed that the emission amount ranged from 1.955 ng to 669.87 ng for oxidized mercury and from 14.53 ng to 3501.15 ng for elemental mercury per gram fly ash during thermal treatment. When the fly ash was calcined up to 60 min,all the mercury existing in both forms was mostly emitted. The emission reached to the maximum at calcination temperature of 600 ℃(except for 3#)for oxidized mercury,and at 400 ℃ for elemental mercury. The emission amount of mercury was proportional to the unburned carbon content in fly ashes.

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