化工进展 ›› 2024, Vol. 43 ›› Issue (9): 4824-4832.DOI: 10.16085/j.issn.1000-6613.2023-1410

• 化工过程与装备 • 上一篇    

采用扭曲片内插件的管壳式换热器自动设计新方法

崔祎1(), 李孟原1, 杨路2, 李海东2, 张奇琪2, 常承林2,3(), 王彧斐1   

  1. 1.中国石油大学(北京)化学工程与环境学院,北京 102249
    2.重庆大学化学化工学院,重庆 401331
    3.浙江大学化学工程与生物工程学院,浙江 杭州 310027
  • 收稿日期:2023-08-13 修回日期:2023-10-16 出版日期:2024-09-15 发布日期:2024-09-30
  • 通讯作者: 常承林
  • 作者简介:崔祎(1999—),男,博士研究生,研究方向为过程系统工程。E-mail:cuiyi0227@foxmail.com
  • 基金资助:
    中央高校基本科研业务费专项(2024CDJXY010);重庆市出站留(来)渝博士后择优资助项目(Z20240373);国家自然科学基金(22008210)

New method for automatic design of intensified shell and tube heat exchanger with twisted-tape insert

CUI Yi1(), LI Mengyuan1, YANG Lu2, LI Haidong2, ZHANG Qiqi2, CHANG Chenglin2,3(), WANG Yufei1   

  1. 1.College of Chemical Engineering, China University of Petroleum, Beijing 102249, China
    2.School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
    3.College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, Zhejiang, China
  • Received:2023-08-13 Revised:2023-10-16 Online:2024-09-15 Published:2024-09-30
  • Contact: CHANG Chenglin

摘要:

管壳式换热器作为应用最广泛的换热器,对其进行优化设计是一个十分重要的研究主题。现有的设计方法多数是基于启发式方法求解或调用商业求解器,其运算速度较慢且不能保证设计解的质量。本文将集合修剪算法应用于管壳式换热器的自动设计,将管外径、管长、壳程直径、管程数、扭曲片节距、扭曲片厚度等定义为离散变量后输入,程序自动输出设计结果与方案。对采用扭曲片内插件的管壳式换热器进行自动设计优化,分别以最小化换热面积、年度总费用、净现值作为优化目标进行单目标优化。对比发现集合修剪算法可以保证设计解的全局最优,同时降低优化求解时间,可在0.5~2s内给出结果。以换热面积最小化为目标函数的优化结果显示,集合修剪算法可得到更小的换热面积,比文献值减少了0.7%,同时采用强化传热可减少换热面积。热流分配在管程时,强化技术降低了7.7%的换热面积,管程侧的压降则提高了16.9%;热流分配在壳程时,则降低14.6%的换热面积,管程压降提高了98.7%。以最小化年度总费用和净现值为目标的优化结果显示,强化传热的费用低于未强化情况,热流分配在管程时费用降低13.1%,分配在壳程时则降低0.57%。此外,换热器的费用也会受到成本参数的影响。

关键词: 换热器, 强化传热, 全局最优, 集合修剪

Abstract:

Shell and tube heat exchangers are the most widely used heat exchangers, and optimizing their design is a crucial research topic. Most existing design methods are based on heuristic methods or commercial solvers, which are slow in solving and can't guarantee the quality of design solutions. This paper applied set trimming to the automatic design of shell and tube heat exchangers. The outer diameter of tubes, the length of tubes, the diameter of the shell side, the number of tube sides, the pitch of twist-tapes, and the thickness of twist-tapes were defined as discrete variables and input into the program, which automatically output the design results and solutions. The automatic design optimization of shell and tube heat exchangers that intensified with twisted-tape insert was carried out by using single-objective optimization with the minimization heat exchange area, total annualized cost, and net present cost as optimization objectives. By comparison, we find that set trimming could ensure the global optimization of the design solution, and its solving time was very short. It could provide results within 0.5—2s. The results of minimizing the heat transfer area as the objective function showed that set trimming could obtain a smaller heat transfer area, which was reduced by 0.7% compared to the literature value. At the same time, the use of intensification techniques could reduce the heat transfer area. When the heat stream was distributed on the tube side, the technique reduced the heat transfer area by 7.7%, and the tube-side pressure drop increased by 16.9%. When the heat stream was distributed on the shell side, the heat transfer area was reduced by 14.6%, and the tube-side pressure drop increased by 98.7%. The optimization results with the objective of minimizing total annualized cost and net present cost showed that the cost of intensified conditions was lower than that of non-intensified states, and when the heat stream distribution was on the tube side, it was 13.1% lower. When distributed on the shell side, it was 0.57% lower. In addition, the cost of heat exchangers will also be affected by cost parameters.

Key words: heat exchanger, heat transfer enhancement, global optimization, set trimming

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