滤袋长度对袋式除尘器内流场影响的数值模拟研究  

Numerical simulation of effect of bag length on flow field inside a bag filter

作　　者：丁倩倩[1,2] 李珊红[1,2] 李彩亭[1,2] 唐奇[1,2] 王娅曼 郭威[1,2] 

机构地区：[1]湖南大学环境科学与工程学院,长沙410082 [2]环境生物与控制教育部重点实验室(湖南大学),长沙410082

出　　处：《环境工程学报》2015年第11期5521-5526,共6页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51108168);中国博士后科学基金项目(2011M501271);湖南省科技厅项目(2012RS4001);湖南省自然科学基金项目(13JJ3044);湖南大学青年教师成长计划资助项目

摘　　要：为提高袋式除尘器处理大烟气量中超细颗粒物的能力,确保袋室内气流尽可能均匀,以某环保公司的中试装置为模型,采用CFD(computational fluid dynamics)模拟6、8和10 m 3种袋长除尘器内的三维流动。运用标准k-ε双方程模型和SIMPLE算法,依据流量分配系数、速度云图和过滤阻力等分析流场内的速度和压力分布。结果表明,袋长为10 m的袋式除尘器流量分配系数更趋近于1.0;相同过滤速度下,速度相对标准偏差的数值6 m>8 m>10 m,滤袋长度为10 m时速度分布比较均匀;虽然10 m的除尘器产生的过滤阻力最大,但在低过滤速度条件下,优势明显。因此长袋除尘器适合在较低的过滤速度下运行。袋式除尘器的数值模拟为提高其处理能力和优化设计提供依据。To improve the ultra-fine particulate separation ability of the bag filter and ensure the bag indoor airflow as uniformly as possible,the three dimensional flow fields in the bag filter with 6 m,8 m and 10 m bag length were numerically simulated by computational fluid dynamics（ CFD）. This model came from an environmental protection company. Using the standard k-ε turbulence model and the SIMPLE algorithm,the variation of speed and pressure distribution of flow field could be got according to the flow distribution coefficient,surface velocity distribution and filtration resistance. The results indicate that flow distribution coefficient Kqiis closer to 1. 0in the case of 10 m. Under the same filtration velocity,the values of speed relative standard deviation is 6 m 8 m 10 m. The velocity distribution is more uniform when the bag length is 10 m. Although the filtering resistance of the 10 m bag filter is higher,the advantage is obvious under the condition of low filtration velocity.Therefore,long bag filter is suitable for low filtration velocity. The simulation results provided a significant theoretical basis for the improvement and optimization of bag filter.

关 键 词：袋式除尘器 数值模拟 滤袋长度 流场 

分 类 号：X701.2[环境科学与工程—环境工程]