电除尘器流场、颗粒场及电场的数值模拟研究

doi:10.12096/j.2096-4528.pgt.19083

发电技术 ›› 2021, Vol. 42 ›› Issue (3): 336-342.DOI: 10.12096/j.2096-4528.pgt.19083

电除尘器流场、颗粒场及电场的数值模拟研究

李文华¹(), 白亮²^,*(), 虞上长¹

¹ 浙江浙能温州发电有限公司, 浙江省乐清市 325602
² 昊姆(上海)节能科技有限公司, 上海市长宁区 200335

收稿日期:2020-08-28 出版日期:2021-06-30 发布日期:2021-06-29
通讯作者: 白亮
作者简介:李文华(1975), 男, 硕士, 高级工程师, 长期从事发电厂设备管理, li13868766918@126.com
虞上长(1966), 男, 硕士, 高级工程师, 长期从事发电厂企事业生产管理
基金资助:
国家重点研发计划项目(2016YFC0209107)

Numerical Simulation of Flow Field, Particle Field and Electric Field for ESP

Wenhua LI¹(), Liang BAI²^,*(), Shangchang YU¹

¹ Zhejiang Zheneng Wenzhou Power Plant Co., Ltd., Leqing 325602, Zhejiang Province, China
² Heimdallr(Shanghai) Hi-Tech Energy Reservation Co., Ltd., Changning District, Shanghai 200335, China

Received:2020-08-28 Published:2021-06-30 Online:2021-06-29
Contact: Liang BAI
Supported by:
Key Research and Development Program of China(2016YFC0209107)

摘要/Abstract

摘要：

通过计算流体力学(computational fluid dynamics，CFD)软件FLUENT，基于k-ε湍流模型、离散相模型(discrete phase model，DPM)、电磁流体(magneto hydro dynamics，MHD)模型等对1000MW机组电除尘器进行多相流及多场条件下的数值模拟研究。结果表明：布置烟道导流板及进口封头气流分布板后，电除尘器(electrostatic precipitator，ESP)各进口烟道内烟气流量、颗粒相流量及第1电场进口截面的速度均匀性均得到明显改善，各进口烟道内烟气流量偏差均在±1%以内，各室入口截面烟气流速相对均方根差均不超过0.25，优于标准要求。通过计算不同供电电压及入口流速时模型的除尘效率可知：电除尘效率与供电电压正相关，与入口流速负相关，计算规律与实际相符。

关键词: 电除尘器, k-ε湍流模型, 多相流, 气流分布, 多物理场

Abstract:

Based on computational fluid dynamics software, with k-ε turbulence model, discrete phase model (DPM) and magneto hydro dynamics (MHD) model, the numerical simulation study of electrostatic precipitator (ESP) system was carried out on multi-field conditions. The numerical simulation results show that, with guide plate and distribution plate, flow deviation of ESP chamber inlet, particle phase flow rate and the first electric field entrance section were improved significantly. Flow deviation of ESP chamber inlet is within ±1%, the root mean square error of gas flow velocity on the ESP inlet section is no more than 0.25. The dedusting efficiency of the model which was calculated at different power supply voltages and inlet flow rates show that, the efficiency of electric dust removal is positively correlated with the supply voltage and negatively correlated with the inlet velocity, which agrees with the reality.

Key words: electrostatic precipitator (ESP), k-ε turbulence model, multiphase flow, air flow distribution, multi-physics field

中图分类号:

TK09

李文华, 白亮, 虞上长. 电除尘器流场、颗粒场及电场的数值模拟研究[J]. 发电技术, 2021, 42(3): 336-342.

Wenhua LI, Liang BAI, Shangchang YU. Numerical Simulation of Flow Field, Particle Field and Electric Field for ESP[J]. Power Generation Technology, 2021, 42(3): 336-342.

图/表 11

图1 电除尘器三维几何模型及网格划分

Fig.1 3D geometric model and grid division of ESP

图2 粒径分布

Fig.2 Particle size distribution

图3 气流分布板及导流板布置方案

Fig.3 Layout scheme of air flow distribution plate and guide plate

图4 流量分配

Fig.4 Flue flow distribution

图5 电除尘器入口截面选取位置

Fig.5 Location of the inlet section of ESP

图6 速度矢量图

Fig.6 Velocity vector diagram

图7 电除尘器第1电场进口截面流场均布情况

Fig.7 Distribution of flue gas velocity in the first electric field of ESP

图8 颗粒相分配

Fig.8 Particle phase distribution

图9 颗粒相各级粒径段分布偏差

Fig.9 Particle size distribution deviation at all levels

图10 电场内电势分布及颗粒运动轨迹

Fig.10 Distribution of electric potential and movement trail of particles in electric field

图11 不同供电电压、入口流速对除尘效率的影响规律

Fig.11 Influence law of different supply voltage and inlet velocity on dust removal efficiency

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电除尘器流场、颗粒场及电场的数值模拟研究

Numerical Simulation of Flow Field, Particle Field and Electric Field for ESP

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