Simulation study of heterogeneous coagulation and removal of heavy metals in the fine particulate state

XU Xianlong; MA Haibo; WANG Dongxu; SUN Daorong; WU Tong; LIU Jingchao; XIONG Zhuo; ZHANG Junying; ZHAO Yongchun

doi:10.19944/j.eptep.1674-8069.2025.03.015

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Simulation study of heterogeneous coagulation and removal of heavy metals in the fine particulate state

Environmental technology | 更新时间：2026-10-14

- Simulation study of heterogeneous coagulation and removal of heavy metals in the fine particulate state
- Electric Power Technology and Environmental Protection Vol. 41, Issue 3, Pages: 506-516(2025)
- 作者机构：
  
  1.国能三河发电有限责任公司，河北廊坊 065201
  2.河北省燃煤电站污染防治技术创新中心，河北廊坊 065201
  3.煤燃烧与低碳利用全国重点实验室（华中科技大学），湖北武汉 430074
- 作者简介：
- 基金信息：
- DOI：10.19944/j.eptep.1674-8069.2025.03.015
  CLC： TK01+1
- Received：18 November 2024，
  
  Accepted：18 March 2025，
  
  Published：15 June 2025
- 稿件说明：
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徐宪龙,马海波,王东旭，等.异相凝并脱除燃煤烟气细颗粒态重金属的模拟研究[J].电力科技与环保,2025,41(3):506-516.

XU Xianlong, MA Haibo, WANG Dongxu, et al. Simulation study of heterogeneous coagulation and removal of heavy metals in the fine particulate state[J]. Electric Power Technology and Environmental Protection, 2025, 41(3):506-516.
徐宪龙,马海波,王东旭，等.异相凝并脱除燃煤烟气细颗粒态重金属的模拟研究[J].电力科技与环保,2025,41(3):506-516. DOI： 10.19944/j.eptep.1674-8069.2025.03.015.

XU Xianlong, MA Haibo, WANG Dongxu, et al. Simulation study of heterogeneous coagulation and removal of heavy metals in the fine particulate state[J]. Electric Power Technology and Environmental Protection, 2025, 41(3):506-516. DOI： 10.19944/j.eptep.1674-8069.2025.03.015.

摘要

目的

煤燃烧过程释放各类重金属元素，极易富集在易逃逸细颗粒上，对环境造成严重威胁，通过在静电除尘器前烟道布置异相凝并系统，可有效吸附烟气中的重金属元素，使其从细颗粒态、气态转移到粗颗粒态，从而提升静电除尘器对这些元素的脱除效率。

方法

本文采取蒙特卡洛方法对凝并过程进行模拟，利用颗粒群平衡方程求解凝并吸附剂对颗粒态重金属的吸附过程，得到不同流量凝并吸附剂情况下吸附前后重金属As在颗粒物中分布规律。

结果

研究表明，在凝并后，1 μm粒径以下细颗粒物上重金属含量不断减少，颗粒物和重金属在4.3~10 μm之间出现峰值。随着凝并吸附剂流量的增加，细颗粒上重金属显著减少，而粗颗粒段峰值不断上升，通过计算确定，在凝并吸附剂含量达到8 ml/m

时，颗粒物吸附效率高达89.51%，细颗粒态砷吸附效率达到92.33%。此外，停留时间以及凝并剂喷射量的增加均能增强凝并效果。

结论

本研究为燃煤电厂痕量元素控制技术的工程应用提供理论指导。

Abstract

Objective

The coal combustion process releases various heavy metal elements

which are easily concentrated on the easy-to-escape fine particles. By placing a heterogeneous agglomeration system in the flue before the electrostatic precipitator (ESP)

the heavy metal elements in the flue gas can be effectively absorbed to make it from the fine particle state

the gas state to the coarse particle state

thereby improving the removal efficiency of these elements by ESP.

Methods

In this paper

Monte Carlo method is adopted to simulate the agglomeration process

and the particle group balance equation is used to solve the adsorption process of the agglomeration adsorbent on the particulate heavy metal

and the distribution of heavy metal arsenic in the particulate matter before and after the adsorption under different flow rates of the coagulation adsorbent is obtained.

Results

The results show that after coagulation

the content of heavy metals on fine particles below 1 μm decreases continuously

and the peaks of particles and heavy metals appear between 4.3~10 μm. At the same time

with the increase in the flow rate of the adsorbent

the heavy metals on

the fine particles decrease significantly

and the peak value of the coarse particle segment continues to rise. It can be calculated that when the condensed adsorbent content reaches 8ml/m

the adsorption efficiency of fine particles was as high as 89.51%

and the adsorption efficiency of fine particulate arsenic reached 92.33%. In addition

the increase in residence time and coagulant injection rate can enhance the effect of coagulation and adsorption

thereby improving the removal efficiency of ESP and realizing the efficient removal of heavy metals in the tail flue gas of coal-fired power plants.

Conclusion

The conclusion can provide theoretical guidance for the transformation of the tail gas of coal-fired power plants with ultra-low emission of heavy metals.

关键词

Keywords

references

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