摘要
通过文献调研等研究方法对燃煤电厂烟气颗粒物在采样管内的沉积情况进行了讨论。为了对烟气中颗粒物进行准确采样,降低颗粒物在采样管中的沉积,通过CFD软件Fluent进行数值模拟求解,研究了不同流体颗粒物条件下采样管内的颗粒物沉积效率。结果表明:流体温度与采样管壁面温度温差越大,热泳力作用效果越明显,颗粒物越容易在壁面处沉积;同时,颗粒物粒径和流体流速的增加,也会使颗粒物在采样管内的沉积效率增加。可见,为了有效减少采样管内颗粒物沉积情况,在降低流体与采样管壁面之间温差的基础上,需要控制颗粒物粒径以及流体流速。研究结果可为烟气重金属颗粒物采样(EPA Method-29)提供参考。
The deposition of particulate matter in the sampling tubes of flue gas from coal-fired power plants is dis⁃cussed through literature research and other research methods.In order to accurately sample the particulate matter in flue gas and reduce the deposition of particulate matter in the sampling tube,numerical simulations were solved by CFD software Fluent to study the efficiency of particulate matter deposition in the sampling tube under different fluid particu⁃late matter conditions.The results show that the greater the temperature difference between fluid temperature and sam⁃pling tube wall temperature,the more obvious the effect of thermophoretic force,the easier the deposition of particulate matter at the wall;at the same time,the increase of particulate matter particle size and fluid flow rate will also increase the deposition efficiency of particulate matter in the sampling tube.It can be seen that in order to effectively reduce the deposition of particulate matter in the sampling tube,the particle size as well as the fluid flow rate need to be controlled on the basis of reducing the temperature difference between the fluid and the wall of the sampling tube.The results of the study can be used as a reference for sampling heavy metal particulate matter in flue gas(EPA Method-29).
作者
单凯旋
沈伯雄
罗江泽
孔佳
SHAN Kaixuan;SHEN Boxiong;LUO Jiangze;KONG Jia(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;Tianjin Key Laboratory of Clean Energy Utilization and Pollutant Control,Tianjin 300401,China)
出处
《河北工业大学学报》
CAS
2023年第2期61-69,共9页
Journal of Hebei University of Technology
基金
国家重点研发计划(2018YFB0605101)
河北省重点研发计划(20373701D)
天津市生态环境重大专项(19ZXSZSN00050,19ZXSZSN00070)。
关键词
颗粒物沉积率
流体温度
流体流速
颗粒物粒径
颗粒物热泳沉积
particle deposition rate
flue gas temperature
flue gas flow rate
particle size
particle thermophoretic depo⁃sition
