海水淡化中降膜蒸发过程的实验研究  

Experimental research of horizontal tube falling film evaporation in desalination

作　　者：牟兴森[1] 杨勇[1] 沈胜强[1] 

机构地区：[1]大连理工大学辽宁省海水淡化重点实验室,辽宁大连116024

出　　处：《热科学与技术》2011年第4期291-296,共6页Journal of Thermal Science and Technology

基　　金：上海市科委科研计划资助项目(09DZ1200502);中央高校基本科研业务费专项资金资助项目(DUT10ZD109);辽宁省海水淡化重点实验室专项资金资助项目

摘　　要：由于横管降膜蒸发具有传热系数高、热耗低、可利用低品位能源等优点,横管降膜蒸发技术成为低温多效海水淡化技术中应用最广泛的方法。搭建了单管横管降膜试验台,观测了横管降膜蒸发的流动过程,研究了横管降膜蒸发过程中的流动特性和传热特性,归纳了管间距、喷淋密度对横管降膜蒸发过程中流动特性和传热特性的影响。实验结果表明:喷淋密度的增加,有助于传热系数的提高,横管顶部传热系数要高于底部。Horizontal tube falling film evaporation is the most widely used method of MED in desalination field at present because it has high heat transfer coefficient, small heat consumption, and low scaling potential. An experimental equipment for horizontal tube falling film evaporation outside a single tube was built. Based on the experiment, the flow process of the horizontal tube failing film evaporation was observed, and the flow characteristics and heat transfer characteristics of the horizontal tube falling film evaporation were researched, and the effect of tube spacing and spray density on the horizontal tube falling film evaporation were summarized. The results show that the heat transfer coefficient increases with increasing of spray density. And the local heat transter coefficient at the top of the tube bundle is higher than that at the bottom.

关 键 词：海水淡化 横管降膜蒸发 流动特性 传热特性 

分 类 号：P747.13[天文地球—海洋科学] TK124[动力工程及工程热物理—工程热物理]