齿带强化传热自然循环蒸发器的优化设计  

The Optimization Design on Heat Transfer Enhancement of Twisted Strip Inserts with Oblique Teeth in the Natural Circulation Evaporators

作　　者：彭德其[1] 张宜文 支校衡[3] 俞秀民[1] 

机构地区：[1]湖南工业大学机械清洗研究所,湖南株洲412008 [2]肇庆市特种设备检验所,广东肇庆526040 [3]郴州职业技术学院,湖南郴州423000

出　　处：《盐业与化工》2006年第5期40-44,共5页Jounral of Salt and Chemical Industry

基　　金：国家科技部火炬计划项目(99D231D7700584);教育部重点项目(00208);省基金项目(02JJY2070)

摘　　要：以斜齿动力学理论为指导、以动力矩强化为目标结构设计的短管加热室,能够在低流速(0．6m/s左右)下实现加热管(Φ38mm×3mm×2000mm或Φ32mm×3mm×2000mm)的自动清洗防垢；传热系数得以成倍强化,循环母液的进出口温度提高值达到自然循环推动力要求的3℃以上,并且阻力在5kPa以下。以自然循环推动力强化为目标进行沸腾室结构设计,自然循环推动力可以达到10kPa以上,足以保证取消强制循环泵后加热室自动清洗防垢的自然循环推动力需要。因此,这种新型结构能够成功地解决蒸发器周期性停车清洗和循环泵高电耗两大问题,实现高产节能高效益。Guided by the dynamics theory of twisted strip with oblique teeth, the heating chamber of short tubes （Φ38mm × 3mm × 2000mm, or Φ32mm × 3mm × 2000mm） are designed to prevent and remove fouling on the heat transfer tubes at low flowing velocity （less than 0.6m/s ）. The purpose of structure design is to enlarge the force moment to drive the strips. The heat transfer coetticient is increased by times. The temperature difference of inlet and outlet of circulating solution meets the demand of natural circulation,i, e. more than 3℃. The flowing resistance is less than 5kPa. The aim of structure design of boiling chamber is to enlarge the driving force of natural circulation. This force can be more than 10kPa and it proves that fouling can be prevented and cleaned away automatically on line when the force pumps are removed. So the new structure can successfully resolve the two big problems of difficult fouling removal and high electricity consumption. Using this technology, output can be increased greatly with high efficiency.

关 键 词：蒸发器 齿带 自然循环 自动清洗 传热强化 流体阻力 

分 类 号：TS35[轻工技术与工程]