立式换热器管外双向内循环三相流态化在线清洗研究  

Study of the Online Cleaning Technology of Three Phases Fluidization of Internal Circulation and Double Directions in Shell Side of Vertical Heat Exchangers

作　　者：俞秀民[1] 吴金香[1] 支校衡[2] 

机构地区：[1]湖南工业大学机械清洗研究所,湖南株洲412008 [2]郴州职业技术学院,湖南郴州423000

出　　处：《湘潭大学自然科学学报》2005年第4期94-97,共4页Natural Science Journal of Xiangtan University

基　　金：国家九五重点推广计划资助项目(96050403A);湖南省教育厅资助项目(03C596)

摘　　要：立式换热器管外污垢清洗很困难.研究的双向内循环流态化清洗方法,是通过分区轮换送气形成正反方向交替的、内循环流动的三相流态化来实现的.建造了由40根Φ32 mm×3 mm×2 000 mm传热管组成的大型的有机玻璃立式试验台,采用色水法对其不同深度的截面速度场进行试验观测.结果表明:一根布气管可以两侧各带动2排传热管区域的流态化清洗;清洗气体的消耗量设计算式为Q=24.8(D2-Nd2);清洗气体的压力为管外液体静压的1.10倍.该清洗技术不仅结构简单,设备费用几乎与传统设备一样,操作方便,清洗费用低廉,而且污垢清洗均匀性好,速度快,无污染.It is quite difficult to remove the dirts of shell side in vertical shell - tube heat exchangers. Based on this, an online cleaning technology has been developed which utilizes the internal circulation of threephase fluidization that flows in the opposite two directions by turns driven with feeding air. A large vertical plexiglass experimental set is designed and built which has 40 heat transfer tubes of Ф32mm×3mm×2 000mm. The speed field in cross - section at different depth was tested through color water. The experiments show that the three - phase fluidization can be produced in the area of 2 - 3 tube layers of each side at one tube of air holes. The amount of needed air Q is calculated through the equation Q = 24.8 （D^2 - Nd^2）, the feed air pressure is equal to 1.1 times static pressure of shell - side liquid. Using this cleaning technique, not only the structure being simple, there is no extra cost, the operation is convenient and the cleaning cost is low; but also foul can be removed evenly and quickly, without any pollution.

关 键 词：换热器 管外清洗 内循环 流态化 

分 类 号：TQ051.5[化学工程]