Chloride Migration, Transformation Behavior and Risk Assessment During Evaporation of Desulfurization Wastewater

QI Hongfeng; ZHAO Ning; CHEN Heng; YANG Linjun

doi:10.19805/j.cnki.jcspe.2025.240631

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Chloride Migration, Transformation Behavior and Risk Assessment During Evaporation of Desulfurization Wastewater

更新时间：2025-12-10

- Chloride Migration, Transformation Behavior and Risk Assessment During Evaporation of Desulfurization Wastewater
- Chinese Journal of Power Engineering Vol. 45, Issue 11, Pages: 1932-1939(2025)
- 作者机构：
  
  1. 广州中电荔新热电有限公司,广东,广州,511340
  2. 南方电网电力科技股份有限公司,广东,广州,510623
  3. 浙大宁波理工学院机电与能源工程学院,浙江,宁波,315000
  4. 东南大学能源热转换及其过程测控教育部重点实验室,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240631
  CLC：
- Published Online：17 November 2025，
  
  Published：17 November 2025
- 稿件说明：
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漆洪峰,赵宁,陈恒,杨林军. 脱硫废水蒸发过程中氯迁移转化行为及风险评估动力工程学报, 2025, 45(11): 1932-1939 https://doi.

org/10.19805/j.cnki.jcspe.2025.240631
漆洪峰,赵宁,陈恒,杨林军. 脱硫废水蒸发过程中氯迁移转化行为及风险评估动力工程学报, 2025, 45(11): 1932-1939 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240631.

org/10.19805/j.cnki.jcspe.2025.240631 DOI：

摘要

脱硫废水热烟气蒸发技术可实现电厂废水零排放

但在蒸发过程中

废水中氯离子容易重新释放至烟气中

导致其在脱硫废水中循环富集。基于此问题

分别采用单液滴蒸发装置和旋转喷雾蒸发实验台对脱硫废水蒸发过程中氯离子的迁移转化行为进行研究。结果表明:氯的释放过程主要分为3个阶段

即自由水分蒸发阶段、壳层不稳定阶段以及壳层热解阶段

其中在自由水分蒸发阶段

脱硫废水中自由态H

容易与Cl

结合生成HCl

而在壳层热解阶段

MgCl

O的热解是造成HCl释放的主要原因;较高的烟气温度会导致较高的氯气态释放占比;当废水调至弱碱性(pH≈9)时

可有效减少气相氯释放;在较高的蒸发气液比下

干燥塔内温度水平有所提高

导致气相氯释放占比较高;从目前已实施热烟气蒸发工艺的电厂来看

粉煤灰中氯含量虽有所增加

但电厂粉煤灰综合利用基本未受影响。

Abstract

The evaporative technology for desulfurization wastewater can achieve zero discharge of wastewater from power plants. However

during the evaporation process

chloride ions in the wastewater can easily be released into the flue gas

leading to their cyclic enrichment in the desulfurization wastewater. This study investigated the migration and transformation behavior of chloride ions during the evaporation of desulfurization wastewater using both a single droplet evaporation device and a rotary spray evaporation experimental setup. Results show that the release process of chloride can be divided into three stages: the free water evaporation stage

the shell instabi

lity stage

and the shell pyrolysis stage. In the free water evaporation stage

free H

ions in the desulfurization wastewater tend to combine with Cl

ions to form HCl. In the shell pyrolysis stage

the thermal decomposition of MgCl

O is the primary reason for HCl release. Furthermore

higher flue gas temperatures lead to a higher proportion of gaseous chlorine release. Adjusting the wastewater to a weak alkaline condition (pH≈9) can effectively reduce gaseous chlorine release. At a higher gas-to-liquid ratio during evaporation

the temperature level in the drying tower increases

resulting in a higher proportion of chlorine release. From the perspective of power plants that have implemented thermal flue gas evaporation processes

although the chlorine content in fly ash increases

the comprehensive utilization of fly ash from power plants remains largely unaffected.

关键词

Keywords

references

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