脱硫塔除雾器安装高度对烟气携液量影响的模拟研究

doi:10.12096/j.2096-4528.pgt.20039

发电技术 ›› 2021, Vol. 42 ›› Issue (2): 247-253.DOI: 10.12096/j.2096-4528.pgt.20039

脱硫塔除雾器安装高度对烟气携液量影响的模拟研究

张双平¹^,²(), 陈伟雄²^,*(), 贾西部¹(), 袁园¹()

¹ 大唐西北电力试验研究院, 陕西省西安市 710021
² 动力工程多相流国家重点实验室(西安交通大学), 陕西省西安市 710049

收稿日期:2020-06-09 出版日期:2021-04-30 发布日期:2021-04-29
通讯作者: 陈伟雄
作者简介:张双平(1991), 男, 工程师, 主要从事燃煤发电机组污染物生成及治理研究, 2309038586@qq.com
贾西部(1982), 男, 工程师, 主要从事燃煤烟气环保、脱硫废水零排放研究, JXB_fengqiang1018@163.com
袁园(1983), 男, 高级工程师, 主要从事燃煤电厂污染物综合治理研究, 25100106@qq.com
基金资助:
国家重点研发计划项目(2018YFB0604303)

Simulation Study on Influence of Installation Height of Mist Eliminator on Liquid Holdup of Flue Gas in Desulfurization Tower

Shuangping ZHANG¹^,²(), Weixiong CHEN²^,*(), Xibu JIA¹(), Yuan YUAN¹()

¹ Datang Northwest Electric Power Test & Research Institute, Xi'an 710021, Shaanxi Province, China
² State Key Laboratory of Multiphase Flow in Power Engineering (Xi'an Jiaotong University), Xi'an 710049, Shaanxi Province, China

Received:2020-06-09 Published:2021-04-30 Online:2021-04-29
Contact: Weixiong CHEN
Supported by:
National Key Research and Development Program of China(2018YFB0604303)

摘要/Abstract

摘要：

某电厂运行过程中存在周期性的除雾器阻力上升和结垢现象，造成除雾器局部坍塌。为解决这一问题，通过数值模拟方法对脱硫塔内部气液两相流场进行模拟，研究除雾器距离喷淋层高度（2.0~3.5 m）和喷淋雾化粒径（1500~2500 μm）等因素下，除雾器最下沿烟气携带喷淋液滴的情况。计算结果表明：随着除雾器距离喷淋层高度的增加，脱硫塔内部流场更趋均匀化，喷淋液滴到达除雾器的质量浓度相应降低。通过数值模拟得出了量化数据，从而为存在除雾器堵塞坍塌等类似现象的国内燃煤电厂提供诊断思路和优化依据。

关键词: 脱硫塔, 流场模拟, 除雾器, 喷淋层

Abstract:

During the operation of a power plant, there is a periodic phenomenon of mist eliminator resistance rising and scaling, which results in the partial collapse of the mist eliminator. In order to solve this problem, the gas-liquid two-phase flow field in the desulfurization tower was simulated by numerical simulation method, and the condition of flue gas carrying spray droplets at the bottom of the mist eliminator was further studied, as affected by the varying heights (2.0-3.5m) from the top spray layer center to the bottom and the different misting drop sizes (1500-2500μm) of the particular nozzles. The results show that with the increase of the distance from the mist eliminator to the spray layer, the mass concentration of spray drops decreases, and the flow field inside the desulphurization tower becomes more uniform. The quantitative data were obtained by numerical simulation, which can provide a diagnostic thought and optimization basis for domestic coal-fired power plants with similar phenomena such as mist eliminator blocking and collapsing.

Key words: desulphurization tower, flow field simulation, mist eliminator, spray layer

中图分类号:

TK09

张双平, 陈伟雄, 贾西部, 袁园. 脱硫塔除雾器安装高度对烟气携液量影响的模拟研究[J]. 发电技术, 2021, 42(2): 247-253.

Shuangping ZHANG, Weixiong CHEN, Xibu JIA, Yuan YUAN. Simulation Study on Influence of Installation Height of Mist Eliminator on Liquid Holdup of Flue Gas in Desulfurization Tower[J]. Power Generation Technology, 2021, 42(2): 247-253.

图/表 10

表1 脱硫塔数值模拟的相关计算参数

Tab. 1 Relevant calculation parameters of numerical simulation for desulphurization tower

参数	数值
喷淋浆液温度/℃	50
喷淋层数	3
烟气进口流速/(m/s)	15.95
烟气进口温度/℃	100
烟气出口压力/Pa	50

图1 脱硫塔结构

Fig.1 Desulphurization tower structure

图2 网格划分及无关性验证

Fig.2 Mesh generation and irrelevance validation

图3 脱硫塔计算区域网格划分

Fig.3 Mesh generation of calculation zone for desulphurization tower

图4 扁平椭球液滴

Fig.4 Flat oval droplet

图5 除雾器液滴质量浓度和烟气流速的关系

Fig.5 Relationship between droplet mass concentration and flue gas velocity in mist eliminator

图6 除雾器液滴极限尺寸和烟气流速的关系

Fig.6 Relationship between droplet limit size and flue gas velocity in mist eliminator

图7 各模型下不同喷淋液滴粒径的临界流速

Fig.7 Critical velocity of spraying droplet size under different models

图8 不同高度下除雾器最下沿液滴质量浓度分布云图

Fig.8 Distribution graphs of droplet mass concentration along the bottom of mist eliminator at different heights

图9 除雾器最下沿的液滴质量浓度变化曲线

Fig.9 Variation curve of droplet mass concentration at the bottom edge of mist eliminator

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脱硫塔除雾器安装高度对烟气携液量影响的模拟研究

Simulation Study on Influence of Installation Height of Mist Eliminator on Liquid Holdup of Flue Gas in Desulfurization Tower

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