基于热流耦合的换热器结垢对传热性能的影响分析  

Analysis of the Influence of Heat Exchanger Fouling on Heat Transfer Performance Based on Thermal Fluid Coupling

作　　者：黄思[1] 牛琦锋 陈建勋 林冠堂 HUANG Si;NIU Qi-feng;CHEN Jian-xun;LIN Guan-tang(School of Mechanical and Automotive Engineering,South China University of Technology,Guangdong Guangzhou 510641,China;Guangdong Institute of Special Equipment Inspection and Research Zhuhai Branch,Guangdong Zhuhai 519002,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510641 [2]广东省特种设备检测研究院珠海检测院,广东珠海519002

出　　处：《机械设计与制造》2022年第9期66-70,共5页Machinery Design & Manufacture

基　　金：广东省特种设备检测研究院科技项目(2020CY11)。

摘　　要：选取工程中常用的管壳式换热器为研究对象,针对换热器中的结垢问题进行数值模拟和传热性能分析。换热器管程介质为常温循环水,壳程为高温减顶气。使用SolidWorks对换热器固体域和流体域进行建模,利用Fluent在相同工况条件下分别对换热器在管内结垢、管外结垢和壳内结垢等情形进行数值模拟,得到了换热器内的速度场、温度场和压力场分布,由此分析管壳式换热器的传热性能,并获得了污垢位置和厚度对换热器传热性能的影响规律。结果表明:随着污垢厚度的增加,换热器的传热系数逐渐减小,结垢侧压降逐渐升高;换热管内侧结垢对换热器传热性能的影响最大,壳程内侧影响最小。A commonly used shell-tube heat exchanger in engineering was selected as the research object.Heat transfer perfor⁃mance was analyzed by numerical simulation for the fouling in the heat exchanger.The mediums in the tube and shell of the heat exchanger were circulating water and vacuum overhead gas respectively.The domains for solid and fluid of the heat exchanger were modeled by SolidWorks.The numerical simulation of the heat exchanger was carried out in Fluent under three different foul⁃ing conditions,namely fouling in the tube,fouling outside the tube and fouling inside the shell.The flow field,temperature and pressure distributions in the heat exchanger were obtained.Furthermore,the heat transfer performance of shell-tube heat exchang⁃er was analyzed,and the effect law of fouling position and thickness on heat transfer performance of heat exchanger was obtained.It is found that with the increase of the fouling thickness,the heat transfer coefficient of the heat exchanger decreases,and the pressure drop increases;the fouling inside the tube has more impact on the heat transfer performance of the heat exchanger,and the fouling inside the shell has less impact.

关 键 词：管壳式换热器 污垢热阻 传热分析 数值模拟 

分 类 号：TH16[机械工程—机械制造及自动化] TK172[动力工程及工程热物理—热能工程]