聚丙烯中空纤维换热器的数值模拟

摘要

由于具有抗腐蚀和结垢的优点，中空纤维换热器在低温下的应用受到关注。为了提高中空纤维换热器的换热效率，以在换热器的壳程增加弓形折流挡板的方式对中空纤维换热器的结构进行了优化研究。利用Gambit 2.4软件，建立了管壳式中空纤维换热器模型；利用Fluent 6.3软件，进行有限体积分析计算。结果表明：数值模拟得到的换热器总传热系数和壳程压降与实验值的误差分别小于8%和6%。通过对比分析发现，在模拟范围内增加弓形折流挡板以后中空纤维换热器的总换热系数提高了21%左右，换热器壳程热阻占总热阻的比例从59%~70%降低到了46%~57%，换热器的壳程压降提高了约12%，但是壳程换热系数与壳程压降的比也明显升高。加弓形折流挡板的中空纤维换热器比无折流挡板的换热器具有更好的换热效率。

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	刘宝亮
	闫秀娟
	刘军
	赵捷
	李保安

关键词：中空纤维换热器；弓形折流挡板；数学模拟；换热效率

Abstract：

Hollow fiber heat exchangers (HFHEs) have gained more attention because of their great resistances to chemical corrosion and fouling for lower temperature applications. In this study, a new structure of HFHE by adding segmental baffles in the shell-side was proposed to strengthen the heat transfer efficiency. Three-dimensional models of HFHEs were built by Gambit 2.4. The models were calculated with the help of Fluent 6.3 by finite volume method. Results show that the deviation of overall heat transfer coefficient(U) and pressure drop of shell-side between simulated and experimental results is less than 8% and 6%, respectively. After adding segmental baffles in HFHE shell-side, the overall heat transfer coefficient is improved by 21% on the condition of simulation, the ratio of shell-side resistance to overall resistance is decreased approximately from 59%-70% to 46%-57%, the pressure drop of shell-side is improved by 12%, but the ratio of shell-side heat transfer coefficient to pressure drop is also greatly increased. HFHE with baffles has better integrated performance than PHFHE without baffles.

Keywords： hollow fiber heat exchanger； segmental baffles； numerical simulation； heat transfer efficiency

Received 2015-03-24;

Fund:

天津市科技支撑计划项目（12ZCZDSF02200）

Corresponding Authors: 李保安,E-mail:libaoan@tju.edu.cn。 Email: libaoan@tju.edu.cn

About author: 刘宝亮(1990-),硕士研究生,研究方向为强化换热。

引用本文:

刘宝亮, 闫秀娟, 刘军, 赵捷, 李保安.聚丙烯中空纤维换热器的数值模拟[J]. 化学工业与工程, 2017,34(1): 90-95

Liu Baoliang, Yan Xiujuan, Liu Jun, Zhao Jie, Li Baoan.Numerical Simulation for Polypropylene Hollow Fiber Heat Exchanger[J]. Chemcial Industry and Engineering, 2017,34(1): 90-95

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