Mechanism of mercury speciation transformation based on combined removal at medium-to-low temperature

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Mechanism of mercury speciation transformation based on combined removal at medium-to-low temperature

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- Mechanism of mercury speciation transformation based on combined removal at medium-to-low temperature
- CIESC Journal Issue 8, Pages: 2061-2066(2009)
- 作者机构：
  
  哈尔滨工业大学能源科学与工程学院,黑龙江,哈尔滨,150001
- 作者简介：
- 基金信息：
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  CLC：
- Online First：05 August 2009，
  
  Published：05 August 2009
- 稿件说明：
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WANG Xihe, GAO Jihui, WANG Shuai, et al. Mechanism of mercury speciation transformation based on combined removal at medium-to-low temperature[J]. CIESC Journal, 2009, (8): 2061-2066.
DOI：

WANG Xihe, GAO Jihui, WANG Shuai, et al. Mechanism of mercury speciation transformation based on combined removal at medium-to-low temperature[J]. CIESC Journal, 2009, (8): 2061-2066. DOI：

摘要

与其他燃煤污染物联合脱除是解决燃煤汞排放问题的有效手段，促进Hg0向Hg2+的形态转化可以提高现有污染物控制装置对燃煤汞排放的控制能力。应用汞形态转化实验台，在中低温条件下研究分析Cl2、SO2、H2O以及 NO2对Hg0氧化过程的影响机理，结果表明，中低温条件下，10 μl8226;L-1Cl2可以氧化90%以上的Hg0。SO2对Hg0形态转化过程的影响呈现区间性变化，按照SO2浓度由小到大可划分为3个区间，只有在第（Ⅱ）区间内SO2浓度才能显著影响Hg0的形态转化过程。H2O与Cl2反应的生成物HCl可以氧化Hg0，但其在中低温条件下氧化Hg0的能力弱于Cl2，使得H2O的存在抑制了Hg0的形态转化。将NO氧化为NO2后进行脱除是低温条件下联合脱除的重要路线，NO2在分解过程中释放出自由氧原子可以将Hg0氧化为HgO，这增强了低温条件下汞与NOx联合脱除的技术可行性。

Abstract

Combined removal with other coal fired pollutants was an effective method to control mercury emission during coal combustion.Accelerating the transformation of Hg0 to Hg2+ could enhance the performance of air pollution control devices in mercury emission control.Therefore

it is necessary to understand the influence factors of mercury speciation transformation.A bench scale test rig was built to simulate the process of mercury oxidation by gas components by using the Ontario Hydro Method for mercury detection at medium-to-low temperature.It was found that 90% Hg0 could be oxidized by Cl2 at the concentration of 10 μl8226;L-1.The process of Hg0 oxidation was sensitive within a range of SO2 concentration

out of which SO2 concentration had little influence on Hg0 oxidation.HCl

as the reaction product of H2O and Cl2

could also oxidize mercury from Hg0 to Hg2+

but its oxidation ability was weaker than Cl2

which generally made H2O an inhibitor of Hg0 oxidation.The process of NO2 decomposition would release free oxygen atoms which could oxidize mercury from Hg0 to Hg2+

so mercury oxidation by NO2 should be considered in a comprehensive kinetics model.

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