缠绕管式换热器的CFD优化  

CFD optimizations of spiral-wound heat exchangers

作　　者：张旭[1] 李明凯 陆平[1] 白芳 周川 华超 Xu ZHANG;Mingkai LI;Ping LU;Fang BAI;Chuan ZHOU;Chao HUA(CAS Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China;Wuhan East Petrochemical Heavy Equipment Co., Ltd., Wuhan, Hubei 430207, China)

机构地区：[1]中国科学院绿色过程与工程重点实验室(中国科学院过程工程研究所),北京100190 [2]武汉东海石化重型装备有限公司,湖北武汉430207

出　　处：《过程工程学报》2019年第4期693-703,共11页The Chinese Journal of Process Engineering

基　　金：十三五水体污染控制与治理科技重大专项基金资助项目(编号：2017ZX07402001);中国科学院洁净能源先导科技专项资助项目(编号：XDA21030600),中国科学院绿色过程与工程重点实验室青年基金资助项目

摘　　要：用ANSYS CFX软件采用基于有限元的有限体积法对简化的缠绕管式换热器的壳程流动进行模拟,考察管束导程和壳程流速等参数对缠绕管式换热器壳程流体流动特性的影响。结果表明,减小缠绕管束的导程可提高壳程流体的湍流程度,增强壳程流体的均匀程度,减少温度死区并提高换热效率,减小同一截面不同区域的压力差,进而减小因流场不均匀而对管束产生的破坏性应力。提高壳程流速可增强换热,但会增加壳程压降。As a new kind of efficient and compact heat exchange equipment, spiral-wound heat exchangers which has the characteristics of high heat transfer efficiency, high degree of intensification, less floor space and so on can realize heat transfer among multiple logistics. These advantages can decrease the overall investment. Although many scholars have studied the spiral-wound heat exchangers by numerical simulation, the effects of every operating parameter on the flowing and heat transferring in the shell domain still need to be studied deeply. In this work the shell fluid field of a simplified spiral-wound heat exchanger was simulated by finite volume method based on finite element method with the commercial software ANSYS CFX. By changing the helical leads of spiral tubes and shell inlet velocities, the flow characteristics and heat transfer performance of the shell fluids in spiral-wound heat exchangers were discovered. What is more, some beneficial reference basis was provided for the optimization designs of the spiral-wound heat exchangers. The results showedthat the less the helical leads of spiral tubes in the spiral-wound heat exchangers, the higher vorticity and turbulence of the shell fluid domain, the less the temperature dead zone, the better the heat transfer performance between the shell fluid domain and tube fluid domain. Furthermore, reducing the helical leads of spiral tubes in the spiral-wound heat exchangers could make thepressure distribution in the shell fluid domain more balance, which reduced the damage caused by the pressure difference between different regions in the shell fluid domain. Increasing theinlet velocity of shell fluid field was beneficial to enhance heat transfer performance between the shell fluid domain and the tube fluid domain, the pressure drop between the inlet of the shell fluid domain and the outlet of the shell fluid domainincreased.

关 键 词：缠绕管式换热器 数值模拟 计算流体力学 导程 进口速度 

分 类 号：TQ051.1[化学工程]