文丘里分离罐气相流场特性及分离效率研究  

Characteristics of Gas Flow Field and Separation Efficiency of Two Venturi Separators with Different Structure

作　　者：陈雪莉[1] 李昌剑[1] 刘万洲 刘旭军 罗永恒 杨红波 于飞 杨丽坤 王俭 

机构地区：[1]华东理工大学煤气化教育部实验室,上海200237 [2]神华宁夏煤业集团煤炭化学工业分公司,宁夏灵武750411

出　　处：《煤化工》2011年第5期18-20,27,共4页Coal Chemical Industry

基　　金："十一五"国家科技支撑计划项目(No.2007BAA08B01)

摘　　要：采用雷诺应力湍流模型和离散颗粒模型对2种不同结构文丘里分离罐内气相和颗粒相进行了数值模拟,对比了其气相流场特性和分离效率。结果表明,侧出口分离罐A内的切向速度分布对称性较差,外旋流区较小,对分离不利;上出口分离罐B内的切向速度分布呈兰金涡分布,对称性良好,外旋流区较大,适合分离。2分离罐对粒径小于5μm颗粒的分离效率比较接近;粒径5μm^45μm的颗粒,B罐的分离效率明显高于A罐;粒径大于45μm的颗粒,A罐的分离效率略高于B罐。Reynolds stress model （RSM） and Discrete particle model （DPM） were used to respectively simulate the gas phase and particle phase in two venturi separators with different structures, meanwhile, the flow characteristics and separation efficiency were analyzed and compared. The results showed that the distribution of tangential velocity in the venturi separator with a side outlet （A） takes the shape of ＂twist of dough＂, and appears distinctly asymmetrical, while the one with a upward outlet （B） takes the shape of ＂Rankine vortex＂, and appears good symmetrical. Compared with venturi separator B, the area of outer swirling-flow of separator A is smaller, which is not in favor of separation. Two separators have the similar efficiencies for the particles less than 5um. For the particles between 5um and 45um, the efficiencies of separator B are higher than those of separator A. However, the efficiencies of separator A are slightly higher for the particles above 45um. The results provide a theoretical basis for the structure optimization of the venturi separator.

关 键 词：文丘里分离罐 数值模拟 气相流场特性 分离效率 

分 类 号：TQ541[化学工程—煤化学工程]