摘要
通过聚并促进细颗粒(PM_(2.5))特别是亚微米颗粒(PM_(1.0))团聚长大或被大颗粒捕集,是提高其脱除效率的有效方法之一。本文采用分区法对燃煤电厂尾部烟气中飞灰的聚并进行了群平衡模拟研究。利用圆柱阵列实现的湍流聚并装置,圆柱横向间距为4倍直径时,纵向间距宜在圆柱直径的15~30倍之间,在工程上较为可行的条件下,对于PM_(1.0)可达到55%或更高的聚并效率。粗颗粒的存在对于细颗粒聚并具有明显的促进作用,聚并停留时间越短,该作用相对越显著。
Capture and removal of fine particles(e.g.PM_(2.5))and submicron particles(PM_(1.0))in particular,can be effectively improved through agglomeration of particles in the upstream of precipitators.In this work,sectional method of population balance model was adopted to investigate the turbulence agglomeration of flyash particles in the flue gas of coal-fired power plants.The agglomerator was consisted of regular cylinder arrays.With transverse spacing of four times of the cylinder diameter and longitudinal spacing in between 15~30 times of the cylinder diameter,the agglomeration efficiency of PM_(1.0) was over 55%under engineering applicable conditions.Large particles could greatly enhance the agglomeration of fine particles,which was relatively more profound when the agglomeration residence time was short.
作者
柳冠青
李水清
曹文广
张伟阔
石战胜
LIU Guan-Qing;LI Shui-Qing;CAO Wen-Guang;ZHANG Wei-Kuo;SHI Zhan-Sheng(China Huadian Science and Technology Institute,Beijing 100070,China;Key Laboratory for Thermal Science and Power Engineering of M inistry of Education,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;School of Energy and Power Engineering,Changsha University of Science and Technology,Changsha 410076,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2021年第4期938-943,共6页
Journal of Engineering Thermophysics
基金
国家重点研发计划项目(No.2017YFB0603203)。
关键词
细颗粒
湍流聚并
分区法
群平衡
fine particles
turbulence agglomeration
sectional method
population balance model
