自转式内置转子颗粒污垢抑制特性研究  

Study on anti-fouling characteristics of particulate fouling using built-in self-rotating rotors

作　　者：谢广烁 张斯亮 王家瑞[1] 肖娟[1] 王斯民[1] XIE Guangshuo;ZHANG Siliang;WANG Jiarui;XIAO Juan;WANG Simin(School of Chemical Engineering and Technology,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;Lanpec Technologies Limited(Shanghai),Shanghai 201518,China)

机构地区：[1]西安交通大学化学工程与技术学院,陕西西安710049 [2]上海蓝滨石化设备有限责任公司,上海201518

出　　处：《化工学报》2022年第12期5384-5393,共10页CIESC Journal

基　　金：国家自然科学基金项目(22108216);中央高校基本科研业务费专项资金(xzy012022070)。

摘　　要：传热管表面的污垢不仅阻碍热量传递,还会增加流体流动阻力,导致传热管使用寿命缩短和经济损失。通过在传热管内插入转子可有效实现传热强化和在线除垢抑垢,研究了不同流速下自转式内置转子圆管内的流场和颗粒污垢特性,采用多重参考系模型(MRF)模拟转子在不同流速下的转动,基于欧拉-欧拉液固两相流模型加载UDF得到管内的颗粒污垢特性。结果表明,内置转子传热管内呈螺旋流动,周向速度和径向速度提高,从而增强管壁的换热性能。随着流速从0.15 m/s增加到0.35 m/s,自转式内置转子圆管内颗粒稳定沉积率增加了136.5%,且增加的幅度逐渐变大;但污垢热阻渐近值减少了48.3%,且达到污垢渐近值所需的时间缩短。在此基础上对比固定转子发现,当流速为0.15~0.25 m/s,转子固定时的污垢热阻更小,而当流速为0.30~0.35 m/s,转子转动时的污垢热阻更小。研究可为内置转子的选型和设计提供参考。Dirt on the surface of heat transfer tubes not only hinders heat transfer,but also increases fluid flow resistance,resulting in reduced service life of heat transfer tubes and economic losses.By inserting the rotor into a heat transfer tube,the heat transfer enhancement,antifouling and descaling can be realized simultaneously.In this paper,the flow field and particle fouling characteristics in the heat transfer tube with built-in rotors were studied under different inlet velocities.Using multiple reference frame model(MRF)to show the rotation of rotors,particle fouling characteristics were obtained based on Euler-Euler liquid-solid two-phase flow model and user defined functions(UDF)plug-in program.The results show that the spiral flow appears by installing a rotor to the heat transfer tube,and the circumferential velocity and radial velocity of the fluid can be increased,so the heat transfer performance of the tube wall is enhanced.With the flow rate increasing from 0.15 m/s to 0.35 m/s,the stable value of particle deposition rate in the tube with the self-rotating rotor increases by 136.5%,and the increasement gradually becomes larger.However,the asymptotic value of fouling resistance decreases by 48.3%,and the time required to reach asymptotic value decreases with increasing inlet velocity.On this basis,compared with the fixed rotor,it is found that when the flow rate is 0.15-0.25 m/s,the fouling resistance is smaller when the rotor is fixed,and when the flow rate is 0.30-0.35 m/s,the fouling resistance is smaller when the rotor is rotating.Therefore,the study of particle fouling characteristics at different inlet velocities provides an important basis for the selection and design of the built-in rotor.

关 键 词：传热管 转子 两相流 结垢 颗粒 数值模拟 

分 类 号：TK172[动力工程及工程热物理—热能工程]