文献类型：期刊文献

英文题名：The Particle Removing Characteristics in a Fixed Valve Tray Column

作者：Wang, Qingli[1,2];Chen, Xueli[1,2];Gong, Xin[1,2]

机构：[1]E China Univ Sci & Technol, Key Lab Coal Gasificat & Energy Chem Engn, Minist Educ, Shanghai 200237, Peoples R China;[2]E China Univ Sci & Technol, Shanghai Engn Res Ctr Coal Gasificat, Shanghai 200237, Peoples R China

年份：2013

卷号：52

期号：9

起止页码：3441

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：;EI(收录号：20131116121224);WOS:【SCI-EXPANDED(收录号:WOS:000315937000036)】；

基金：This research was supported by Program for New Century Excellent Talents in University of China (NCET-12-0854) and National High-tech R&D Program of China (2007AA050301, 2012AA053101).

语种：英文

外文关键词：Efficiency - Light transmission - Particle size analysis - Particle size - Diffusion - Size distribution

摘要：A method of predicting the particle collection efficiency of a fixed valve tray column and the particle size distribution properties, which considers diffusion, interception, and impaction, is presented to study the particle removal mechanisms of a fixed valve column. The particle size distribution of fly ash particles is represented by a log-normal function, and the continuous evolution of the particle size distribution in a fixed valve column is taken into account with the first three moment equations. The results show that the collection efficiency is represented as a U-shaped curve with a minimum in the region of around 2.0 mu m in particle size. This allows fly ash particles in the diffusion and in the impaction-dominant regions to be removed at a higher rate compared with fly ash in the intermediate region. As particles pass through the bubble column, the geometric standard deviations of the size distribution of fly ash particles decrease. The geometric mean diameter of fly ash particles in the diffusion-dominant region increases, whereas it decreases in the impaction-dominant region. The present study also shows that, in optimum operation conditions such as low bubble slip velocity, small bubble size, and high gas holdup, the fixed valve tray column has sufficient ability to remove tiny and hydrophobic particles.