Sensitivity analysis for performance of a new gas-liquid distributor used in plate fin heat exchangers

doi:10.3969/j.issn.0438-1157.2013.06.015

CIESC Journal ›› 2013, Vol. 64 ›› Issue (6): 2007-2014.DOI: 10.3969/j.issn.0438-1157.2013.06.015

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Sensitivity analysis for performance of a new gas-liquid distributor used in plate fin heat exchangers

LI Yan¹, LI Yuxing¹, HU Qihui¹, WANG Wuchang¹, XIE Bin², YU Xichong²

1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, Shandong, China;
2. CNOOC Research Center, Beijing 100149, China

Received:2012-10-22 Revised:2013-01-16 Online:2013-06-05 Published:2013-06-05
Supported by:
supported by the National Science and Technology Major Project of China(2011ZX05026-006-07),the Fundamental Research Funds for the Central Universities(13CX06059A),the Graduate Innovation Foundation of China University of Petroleum(CX2013022)and the Australia-China Natural Gas Technology Partnership Fund(2012).

一种新型板翅式换热器气液分配器分配特性的敏感性分析

李焱¹, 李玉星¹, 胡其会¹, 王武昌¹, 谢彬², 喻西崇²

1. 中国石油大学(华东)储运与建筑工程学院,山东青岛 266580;
2. 中海石油研究总院,北京 100149

通讯作者: 李玉星
作者简介:李焱(1986—),女,博士研究生。
基金资助:
国家科技重大专项(2011ZX05026-006-07);中央高校基本科研业务费专项资金项目(13CX06059A);中国石油大学(华东)研究生创新工程项目(CX2013022);中澳天然气技术伙伴关系基金(2012)。

Abstract

Abstract: Flow maldistribution is the major factor that influences the heat exchange efficiency of plate fin heat exchangers (PFHEs).By the traditional gas-liquid distribution method with mixing prior to distribution, the gas-liquid separation will occur due to the direction change in the distributing fins, which may lead to flow maldistribution.To solve this problem, a new gas-liquid distributor based on the concept with distribution prior to mixing is proposed.The gas and liquid flow into their respective channels and mix uniformly in the distributor, and then the gas/liquid mixture flows into the heat exchanger to exchange heat with materials with high temperatures.The calculation results show that the non-uniformity of flow distribution rises increases with flow rate, and the flow rate of liquid phase has greater influence on the flow distribution than that of gas phase.In addition, the standard deviation of the distributor is one magnitude lower than that of the header.The distributor can obviously improve the gas-liquid flow uniformity in PFHEs and increase their heat exchange efficiency.

Key words: plate fin heat exchanger, gas-liquid distributor, flow distribution, maldistribution, numerical simulation

摘要： 两相流动分配不均是影响板翅式换热器换热效率的主要因素。传统的"先混合,后分配"方法不能解决在导流翅片中流向突变时气液分离引起的气液两相流体分配不均问题,因此采用"先分配,后混合"的理念提出了一种新型的气液分配器,气体和液体分别从各自的通道进入分配器,在分配器内均匀混合后进入换热器的翅片换热通道进行换热。通过对分配器内部流场的数值模拟,发现:分配器的气液分配不均匀度随流量的增加而增加,且不均匀度受液相流量的影响比气相大。该气液分配器的气液分配不均匀度相比传统封头结构降低了一个数量级,能够有效改善板翅式换热器层间通道的气液分配特性,提高板翅式换热器的换热效率。

关键词: 板翅式换热器, 气液分配器, 流量分配, 分配不均, 数值模拟

CLC Number:

TE646

LI Yan, LI Yuxing, HU Qihui, WANG Wuchang, XIE Bin, YU Xichong. Sensitivity analysis for performance of a new gas-liquid distributor used in plate fin heat exchangers[J]. CIESC Journal, 2013, 64(6): 2007-2014.

李焱, 李玉星, 胡其会, 王武昌, 谢彬, 喻西崇. 一种新型板翅式换热器气液分配器分配特性的敏感性分析[J]. 化工学报, 2013, 64(6): 2007-2014.

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Sensitivity analysis for performance of a new gas-liquid distributor used in plate fin heat exchangers

一种新型板翅式换热器气液分配器分配特性的敏感性分析

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