Citation: LI Zhi-chao, DUAN Yu-feng, WANG Yun-jun, HUANG Zhi-jun, MENG Su-li, SHEN Jie-zhong. Mercury removal by ESP and WFGD in a 300 MW coal-fired power plant[J]. Journal of Fuel Chemistry and Technology, ;2013, 41(4): 491-498. shu

Mercury removal by ESP and WFGD in a 300 MW coal-fired power plant

1.
1. Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China;

Corresponding author: DUAN Yu-feng,
Received Date: 2 August 2012
Available Online: 24 October 2012
Fund Project: 国家自然科学基金(51076030) (51076030) 江苏省环保科研课题基金(201113) (201113) 煤燃烧国家重点实验室开放基金(FSKLCC1002). (FSKLCC1002)

The Ontario Hydro Method (OHM) was used to sample and analyze the mercury concentration in flue gas before and after ESP and WFGD in a 300 MW power plant. Mercury content in coal, bottom slag, fly ash of ESP, adsorbent (limestone) and desulfurization product (gypsum) was detected by DMA80. Mercury mass balance was calculated based on the online measurements through the boiler system. Factors affecting the distribution, transformation and removal of mercury in flue gas were discussed. The results show that the gaseous mercury (Hg⁰ and Hg²⁺) in flue gas accounts for about 95% of total mercury, while mercury in the bottom ash can be neglected. More than 95% of Hg^p and a little gaseous phase mercury (Hg⁰ and Hg²⁺)were removed by ESP. The efficiencies to remove total mercury by ESP range from 12.77% to 17.38%. A removal efficiency for Hg²⁺(g) reaches up to 79.93%~90.53% by WFGD, however, the content of Hg⁰ after WFGD increases because part of oxidized mercury is reduced to elemental mercury during WFGD. The efficiencies to remove total mercury by WFGD range from 9.68% to 29.36%. ESP and WFGD can remove all of the Hg^p and a majority of Hg²⁺ with a total mercury removal efficiency of 25.38%~38.38%. In general, the demercuration in the conventional devices of ESP and WFGD is not high, which perhaps is owing to the lower concentration of Cl in feed coal.
- coal-fired power plant,
- mercury mass balance,
- ESP,
- WFGD,
- mercury speciation,
- demercuration efficiency
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