不同背压下旋流式气液分离器工作特性  

Performance of a gas-liquid separator under different back pressure

作　　者：李华[1,2] 尹俊连[3] 张宁[1,2] 钱渊[1,2] 刘卫[1,2] 

机构地区：[1]中国科学院上海应用物理研究所嘉定园区,上海201800 [2]中国科学院核辐射与核能技术重点实验室,上海201800 [3]上海交通大学机械与动力工程学院,上海200240

出　　处：《核技术》2015年第1期85-90,共6页Nuclear Techniques

基　　金：中国科学院战略性先导科技专项(No.XDA02000000)资助

摘　　要：以一种适用于熔盐堆脱气系统的旋流式气液分离器为研究对象,利用流动可视化技术,对分离器气芯的形成进行了深入研究。研究结果表明,分离器的分离效率与气芯密切相关,分离器内形成稳定气芯就可实现对流体中气相的连续分离,分离器的背压对气芯的形成有重要影响。通过高速摄像技术记录了气芯的演变过程,气芯的演变主要分为负压、平衡、微正压和稳定四个阶段,不同的旋流数S和雷诺数Re下均可经过四个阶段最终形成稳定气芯,只是对应临界背压不同,分离器的经济性不同。利用计算流体动力学模拟软件Fluent模拟了背压对气芯形成过程的影响,计算结果与实验结论基本一致,背压越大,气芯越稳定,但分离器分流比越高,经济性越差,背压超过一定值时,贯穿分离器的气芯将逐渐被压缩变短。Background： One advantage of liquid fluoride thorium reactor is that it can separate almost all of fission products including its own transuranic products due to the on-line removing. The removing process can be defined as bubble generation-mass transfer-gas separation. Purpose： A gas-liquid separator is a core component in the removing system. In this paper, a kind of gas-liquid separator adopted to remove the fission gases for Thorium Molten Salt Reactor （TMSR） is studied. The air core formation, which is heavily depending on the back pressure, plays a significant role for separation efficiency. Methods： To illustrate the effect of back pressure on the evolution process of the air core, the air core behavior variation with the back pressure under different swirling numbers （S） and Reynolds numbers （Re） were recorded by visualization technique. Results： The flow pattern indicates that the air core evolution can be defined as four stages with respective characteristics. However, the air core can shape under different swirling numbers and Reynolds numbers differ a lot. Conclusion： It is proven that there is a critical back pressure which contributes an economic and high efficient separation. Thus, the critical back pressures were summarized for all the swirling numbers and Reynolds numbers involved, which can provide a guideline for the application of the separator.

关 键 词：气液分离器 气芯 背压 旋流 

分 类 号：TL99[核科学技术—核技术及应用]