Optimization Method of Flow Field for Alleviating Clogging of Mist Eliminator in Desulfurization Tower

LIU Zhuo; CHEN Donglin; WANG Shuqi; YANG Yijiang; YAN Youyang; YANG Zhan

doi:10.12096/j.2096-4528.pgt.23176

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Optimization Method of Flow Field for Alleviating Clogging of Mist Eliminator in Desulfurization Tower

Power Generation and Environmental Protection | 更新时间：2025-06-15

- Optimization Method of Flow Field for Alleviating Clogging of Mist Eliminator in Desulfurization Tower
- Power Generation Technology Vol. 45, Issue 6, Pages: 1087-1094(2024)
- 作者机构：
  
  长沙理工大学能源与动力工程学院，湖南省长沙市 410114
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(52104391)
- DOI：10.12096/j.2096-4528.pgt.23176
  CLC： TK 09
- Received：20 June 2024，
  
  Revised：2024-09-25，
  
  Published：31 December 2024
- 稿件说明：
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刘卓,陈冬林,汪淑奇等.减缓脱硫塔除雾器堵塞的流场优化方法[J].发电技术,2024,45(06):1087-1094.

LIU Zhuo,CHEN Donglin,WANG Shuqi,et al.Optimization Method of Flow Field for Alleviating Clogging of Mist Eliminator in Desulfurization Tower[J].Power Generation Technology,2024,45(06):1087-1094.
刘卓,陈冬林,汪淑奇等.减缓脱硫塔除雾器堵塞的流场优化方法[J].发电技术,2024,45(06):1087-1094. DOI： 10.12096/j.2096-4528.pgt.23176.

LIU Zhuo,CHEN Donglin,WANG Shuqi,et al.Optimization Method of Flow Field for Alleviating Clogging of Mist Eliminator in Desulfurization Tower[J].Power Generation Technology,2024,45(06):1087-1094. DOI： 10.12096/j.2096-4528.pgt.23176.

摘要

目的

脱硫塔除雾器因其结构简单、除雾效果好而广泛应用于燃煤火电厂。然而，除雾器因自身气水分离原理的局限性，容易在板面上结垢堵塞，严重时影响机组的输出功率。因此，需要解决湿法脱硫塔除雾器频繁结垢堵塞及由此造成的阻力损失过大问题。

方法

提出了采用导流板优化脱硫塔及其进口烟道流场的方法，并对优化前后的Z形脱硫塔及其L形进口烟道烟气流场进行了仿真计算和工程应用验证。

结果

仿真计算结果显示，在额定锅炉负荷工况下，优化后L形进口烟道出口截面的速度相对标准差从27.57%降至19.99%；Z形脱硫塔内除雾器入口截面的速度相对标准差从45.66%降至40.24%。同时，除雾器入口截面的浆液液滴质量流量从441.136 kg/s降至368.498 kg/s，这表明优化方案有效降低了除雾器的工作负荷。实验结果表明，改造前脱硫塔除雾器入口截面存在速度为0 m/s的区域，改造后该区域速度提升至1~5 m/s，与仿真计算结果趋势一致。改造后180天的运行数据显示，除雾器前后压差不再超过200 Pa。停机检修中实测结果显示，除雾器板面上的结垢厚度从改造前的1 cm以上减小至0.1 cm左右，严重结垢堵塞现象已消除。

结论

所提流场优化方法显著改善了脱硫塔内烟气流场的均匀性，降低了除雾器的工作负荷，有效减缓了除雾器结垢堵塞问题，具有较大的工程应用价值。

Abstract

Objectives

Desulfurization tower mist eliminator is widely used in coal-fired power plants due to its simple structure and good fog removal effect. However

due to the limitation of its own gas-water separation principle

it is prone to scaling up and blocking on the plate surface

which seriously affects the output power of the unit. Therefore

it is necessary to solve the problem of frequent scaling and clogging of the wet desulfurization tower mist eliminator and the resulting excessive resistance loss.

Methods

The method of optimizing the flow field of desulfurization tower and its inlet flue using deflector plates was proposed

and the simulation calculations and engineering application verifications of the Z-shaped desulfurization tower and its L-shaped inlet flue before and after optimization were carried out.

Results

The simulation results indicate that under rated boiler load conditions

the relative standard deviation of the velocity at the outlet section of the L-shaped inlet flue decreases from 27.57% to 19.99% after optimization. The relative standard deviation of the velocity at the inlet section of the mist eliminator in the Z-shaped desulfurization tower decreases from 45.66% to 40.24%. Meanwhile

the mass flow rate of the slurry droplets at the mist eliminator inlet section drops from 441.136 kg/s to 368.498 kg/s

indicating that the optimization scheme effectively reduces the workload of the mist eliminator. Experimental results show that prior to the modification

there were regions with a velocity of 0 m/s at the mist eliminator inlet section

which are improved to a velocity of 1-5 m/s after the modification

consistent with the trends observed in the simulation. Data from 180 days of operation after the modification indicate that the pressure drop before and after the mist eliminator does not exceed 200 Pa. On-site measurement results during maintenance show that the scaling thickness on the mist eliminator plate is reduced from over 1 cm before the modification to about 0.1 cm

eliminating severe scaling and blockage phenomena.

Conclusions

The proposed flow field optimization method significantly improves the uniformity of the flue gas flow field in the desulfurization tower

reduces the workload of the mist eliminator

and effectively slows down the fouling problem of the mist eliminator

which has great engineering application value.

关键词

Keywords

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