Experimental study on re-emission characteristics of mercury and arsenic in process of aeration of seawater wet flue gas desulfurization

LEI Siyuan; WANG Zhonghui; HUANG Jianxun; SU Sheng; WANG Lele; XIE Jiannan; XIANG Jun; MA Yunlong

doi:10.19666/j.rlfd.202108157

English

您当前的位置：

首页 >

文章列表页 >

Experimental study on re-emission characteristics of mercury and arsenic in process of aeration of seawater wet flue gas desulfurization

Thermal Power Generation Vol. 51, Issue 2, Pages: 105-111(2022)

更新时间：2025-05-30

- Experimental study on re-emission characteristics of mercury and arsenic in process of aeration of seawater wet flue gas desulfurization
- 作者机构：
  
  1. 西安热工研究院有限公司苏州分公司
  2. 华中科技大学能源与动力工程学院煤燃烧国家重点实验室
  3. 厦门华夏国际电力发展有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202108157
  CLC： X701.3
- Published：2022
- 稿件说明：
移动端阅览
LEI Siyuan, WANG Zhonghui, HUANG Jianxun, et al. Experimental study on re-emission characteristics of mercury and arsenic in process of aeration of seawater wet flue gas desulfurization[J]. Thermal Power Generation, 2022, 51(2): 105-111.
DOI：

LEI Siyuan, WANG Zhonghui, HUANG Jianxun, et al. Experimental study on re-emission characteristics of mercury and arsenic in process of aeration of seawater wet flue gas desulfurization[J]. Thermal Power Generation, 2022, 51(2): 105-111. DOI： 10.19666/j.rlfd.202108157.

摘要

海水湿法烟气脱硫装置排放的脱硫废水在曝气过程中，由于脱硫废水中存在部分还原性离子（SO_3~(2–)、Fe~(2+)、Mn~(2+)等），会将脱硫过程中捕集的汞、砷离子还原为气态汞和气态砷再次释放到大气中，降低湿法脱硫系统的汞、砷脱除效率。采用曝气反应器，通过模拟实际脱硫废水的曝气过程，重点考察了温度、Cl~–质量浓度、SO_3~(2–)浓度、SO_4~(2–)质量浓度及曝气流量对汞、砷再释放特性的影响。结果表明：随着温度的提高和曝气流量的增大，会加速汞、砷离子的还原，促进汞、砷的再释放；随着SO_3~(2–)浓度的提高，会显著抑制汞的再释放，但对砷的再释放影响较弱；汞、砷的再释放率呈现先增大后减小的趋势；Cl~–和SO_4~(2–)可与溶液中的汞离子形成性质稳定的络合物，也可与砷离子以更稳定的化合态相结合，从而有效抑制汞、砷的再释放，并且Cl~–的抑制作用比SO_4~(2–)更显著。

Abstract

During the aeration process of the desulfurization wastewater discharged from the seawater wet flue gas desulfurization unit

some reducing ions (SO_3~(2–)

Fe~(2+)

Mn~(2+)

etc.) are present in the desulfurization wastewater

which will reduce the mercury and arsenic ions captured during the desulfurization process to gaseous mercury and gaseous arsenic to be released to the atmosphere again

reducing the mercury and arsenic removal efficiency of the wet desulfurization system.An aeration reactor is used to simulate the actual aeration process of desulfurization wastewater

the effects of temperature

Cl~–concentration

SO_3~(2–)concentration

SO_4~(2–)concentration and aeration flow rate on the re-emission characteristics of mercury and arsenic are investigated in detail.The results show that

as the temperature and aeration flow increase

the reduction of mercury and arsenic ions will be accelerated

and the re-emission of mercury and arsenic will be promoted.The increase of the concentration of SO_3~(2–)will significantly promote the re-emission of mercury

but has a weak effect on re-emission of arsenic.The re-emission rate of mercury and arsenic shows a trend of first increasing and then decreasing.Cl~–and SO_4~(2–)can form stable complexes with mercury ions in the solution

and can also be combined with arsenic ions in a more stable chemical state

thereby effectively inhibiting the re-emission of mercury and arsenic

and the inhibitory effect of Cl~–is more significant than SO_4~(2–).

关键词

Keywords

references

Views

下载量

CSCD

Alert me when the article has been cited

提交

Publicity Resources

Deactivation of vanadium and titanium based SCR catalyst used in coal-fired power plants

Effect of chlorine and fluorine elements on mercury species and its distribution in flue gas

Catalytic oxidation characteristics of modified carbon nanotubes on elemental mercury in oxy-coal combustion environment

Numerical study on spray evaporation process of desulfurization wastewater in flue duct

Adsorption kinetics and models of coal-fired fly ash for mercury removal

Related Author

PAN Siwei

CHENG Hua

WEI Zhengle

HUANG Bichun

RUAN Dongliang

YIN Libao

YU Liangying

XU Qisheng

Related Institution

Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control

School of Environmental Science and Engineering, South China University of Technology

Guangdong Power Grid Corporation Electric Power Science Research Institute

School of Power and Mechanical Engineering, Wuhan University

Shenzhen Dongfang Boiler Control Co., Ltd

AI问答

⁰