Migration and Transformation Characteristics of Mercury During Desulfurization Wastewater Evaporation

SUN Zongkang; CHEN Heng; GU Liyan; ZHAN Lingxiao; YANG Linjun

doi:10.19805/j.cnki.jcspe.2025.240055

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Migration and Transformation Characteristics of Mercury During Desulfurization Wastewater Evaporation

更新时间：2025-10-16

- Migration and Transformation Characteristics of Mercury During Desulfurization Wastewater Evaporation
- Chinese Journal of Power Engineering Vol. 45, Issue 5, Pages: 765-770(2025)
- 作者机构：
  
  1. 广东电力发展股份有限公司,广东,广州,510000
  2. 浙大宁波理工学院,浙江,宁波,315000
  3. 东南大学能源热转换与控制教育部重点实验室,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240055
  CLC： X703
- Published Online：19 May 2025，
  
  Published：2025
- 稿件说明：
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孙宗康,陈恒,顾丽燕,詹凌霄,杨林军. 脱硫废水蒸发过程中汞的迁移转化特性动力工程学报, 2025, 45(5): 765-770 https://doi.

org/10.19805/j.cnki.jcspe.2025.240055
孙宗康,陈恒,顾丽燕,詹凌霄,杨林军. 脱硫废水蒸发过程中汞的迁移转化特性动力工程学报, 2025, 45(5): 765-770 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240055.

org/10.19805/j.cnki.jcspe.2025.240055 DOI：

摘要

针对脱硫废水旁路热烟气蒸发技术存在的汞再释放问题

研究了脱硫废水蒸发过程中汞的分布和释放机理

考察了烟气温度、废水组分(Cl

、SO

)的影响。结果表明:在典型工况条件下

废水中94.1%的汞可释放到气相中

释放过程可分为3个阶段

即气态Hg

是最初蒸发过程中汞释放的主要来源;随后

由于氯化物的水解

生成氯氧化气氛

诱导Hg

的均匀氧化;废水蒸发结束时

HgS和HgO热解会释放出少量的Hg。此外

废水蒸发温度越高

汞的稳定性越差;废水中SO

和Cl

质量浓度对气态Hg

、Hg

释放比例的影响较大。

Abstract

In response to the issue of mercury re-release associated with the bypass flue gas evaporation technology for desulfurization wastewater

the distribution and release mechanism of mercury in the evaporation process of desulfurization wastewater were investigated

and the effects of flue gas temperature and wastewater components (Cl

) were examined. Results show that 94.1% of mercury in the wastewater can be released into the gas phase under typical working conditions

and the release process can be divided into three stages: gaseous Hg

is the main source of mercury release

during the initial evaporation process; subsequently

due to the hydrolysis of chloride

a chlorine-oxidizing atmosphere is generated

which induces the uniform oxidation of Hg

; and at the end of the wastewater evaporation

a small amount of Hg is released in the pyrolysis of HgS and HgO. In addition

the higher the evaporation temperature of the wastewater

the worse the stability of mercury. The concentrations of SO

and Cl

in the wastewater have a large influence on the release proportional of gaseous Hg

and Hg

关键词

Keywords

references

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