新型颗粒层的过滤性能  

Filtration performance of a new granular layer

作　　者：颜学升[1] 王助良[1] 张敏[1] 孙志辉[1] 

机构地区：[1]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《江苏大学学报（自然科学版）》2009年第5期491-495,共5页Journal of Jiangsu University：Natural Science Edition

基　　金：江苏省高校自然科学基金资助项目(03KJA610021)

摘　　要：新型颗粒层采用固定床连续过滤、流化床连续清灰工作方式,克服了现有颗粒层过滤过程中存在的颗粒间隙增大、颗粒错位等问题,改善了过滤装置的过滤性能.通过试验研究了颗粒层的清灰周期、过滤速度和过滤介质粒径等重要参数对颗粒层过滤分级效率的影响,得出洁净气流中灰尘粒径分布规律,并探讨了新型颗粒层过滤装置的低能耗、高效过滤的设计参数和运行参数.研究结果表明,选择合适粒径范围的过滤介质能达到较高的过滤效率和较低的床层阻力;调节清灰周期能灵活地改变颗粒层的过滤性能,满足各种工艺的过滤要求.Fixed bed continuous filtration and fluidized bed continuous dust removal were employed in a new granular layer, which overcomed existing problems such as granular gap increasing, granular dislocation during filtration, and improved filtration performance of the filtration device. Experiments were carried out on influences of critical parameters of dust removal cycle, filtration speed, and medium dimension on filtration classification efficiency. Dust diameter distributions after filtration were obtained, which were taken as a standard for judging influential extent of filtration parameters. Design and operation parameters for low energy cost and high filtration efficiency were experimentally tested. The results indicate that with reasonable medium dimensions, higher filtration efficiency and lower bed resistance can be achieved. Filtration performance can be changed with adjustment of dust removal cycle. The adjustment allows the filtration device to meet the filtration requirements of various techniques.

关 键 词：颗粒层过滤 过滤效率 床层压降 清灰周期 

分 类 号：TK284.15[动力工程及工程热物理—动力机械及工程]