高温线管式静电除尘过程三维模拟  

3D numerical simulation of particles collection in a high-temperature wire-cylinder electrostatic precipitator

作　　者：杨光[1] 肖刚[1] 倪明江[1] 陈冬[1,2] 刘意强 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,浙江杭州310027 [2]浙江工业大学机械工程学院,浙江杭州310014 [3]浙江同景新能源集团,浙江江山324100

出　　处：《热力发电》2017年第5期43-49,共7页Thermal Power Generation

基　　金：国家自然科学基金项目(51276167)~~

摘　　要：为了分析高温线管式静电除尘器中的除尘过程与颗粒运动情况,建立了颗粒动力学与颗粒收集的三维理论模型,并利用商业CFD软件Fluent对模型进行模拟计算。结果表明:高温线管式静电除尘系统的除尘效率、颗粒运动情况与实验研究较符合;增大端口电压是提高除尘效率的有效方法;当粒径减小时,颗粒的沉积高度会迅速增大,从而变得难以收集,以620℃、端口电压17 310 V的工况为例,粒径大于6μm颗粒的收集效率接近100%,而亚微米颗粒(0.1~1.0μm)的收集效率只有40%左右;颗粒进入除尘空间的初始位置对颗粒运动轨迹有很大影响,以粒径为10μm的颗粒为例,颗粒的初始位置越靠近阳极管,颗粒沉积高度就越低,收尘所需时间越短。In order to investigate the particle tracing and trapping process in a high-temperature wire-cylinder electrostatic precipitator （ESP）, a 3D numerical model was established for the particle dynamic field and particle collection. Moreover, numerical simulation was performed by using the commercial CFD Fluent software. The results show that, the simulated dust collection efficiency and particles behaviour agree well with the experimental results. Increasing the port voltage （Up） is an effective way to boost the collection efficiency. The height of particle deposition increased rapidly with the decreasing particle diameter, which makes the particles escape more easily. When the temperature approaches 620 ＂C and the port voltage reaches 17310 V, the collection efficiency of particles larger than 6 grn achieves almost 100% while that of the submicron particles （0.1-1.0 ~＇n） only reaches 40%. The initial position of particles entering the dust removal space affects the particles＇ trajectory greatly, for example, particles with diameter of 10 laxn will deposit at a low height in a comparatively short time if they enter the ESP nearby the anode tube.

关 键 词：静电除尘器 线管式 高温 颗粒运动 除尘效率 数值模拟 

分 类 号：TK09[动力工程及工程热物理]