ANALYSIS ON THE LAW OF COMBINED DEMERCURATION OF FLUE GAS PURIFICATION UNIT BY ADDING CaCl<sub>2</sub>

HAN Lei; ZHONG Zhao-ping; JIANG Chao

doi:10.13205/j.hjgc.202104010

Volume 39 Issue 4

Jul. 2021

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HAN Lei, ZHONG Zhao-ping, JIANG Chao. ANALYSIS ON THE LAW OF COMBINED DEMERCURATION OF FLUE GAS PURIFICATION UNIT BY ADDING CaCl2[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(4): 57-63. doi: 10.13205/j.hjgc.202104010

Citation:

HAN Lei, ZHONG Zhao-ping, JIANG Chao. ANALYSIS ON THE LAW OF COMBINED DEMERCURATION OF FLUE GAS PURIFICATION UNIT BY ADDING CaCl₂[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(4): 57-63. doi: 10.13205/j.hjgc.202104010

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ANALYSIS ON THE LAW OF COMBINED DEMERCURATION OF FLUE GAS PURIFICATION UNIT BY ADDING CaCl₂

doi: 10.13205/j.hjgc.202104010

College of Energy and Environment, Southeast University, Nanjing 210096, China

Received Date: 2020-06-15
Available Online: 2021-07-21

Abstract

Abstract

The combustion of coal releases a large amount of mercury into the atmosphere. In order to explore cost-effective mercury emission control methods, the hydrolysis experiment of CaCl₂ crystal was carried out in a tubular furnace. Under certain temperature and atmosphere, CaCl₂ could hydrolyze to produce HCl, which was conducive to the oxidation of Hg⁰ in flue gas. The results showed that the hydrolysis rate increased with the increase of reaction temperature. The experiment of CaCl₂ solution evaporation combined with mercury removal was carried out in a fluidized bed furnace. Spraying CaCl₂ solution in coal could significantly improve the oxidation rate of SCR denitrification device to Hg⁰; compared with spraying in raw coal, spraying CaCl₂ solution in the evaporation drying tower before FF would significantly improve the effect of removing Hg by FF bag filter; spraying CaCl₂ solution into coal would increase the concentration and proportion of Hg²⁺ in flue gas, and the removal effect of WFGD wet desulfurization unit on gaseous Hg was improved. On the whole, the higher the temperature was and the higher the chlorine addition ratio was, the higher the synergistic mercury removal efficiency of the flue gas purification device was.
- demercuration,
- CaCl₂ hydrolysis,
- fluidized bed boiler,
- flue gas purification device,
- chlorine addition ratio

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References(23)

References

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