Dynamic simulation on cryogenic multi-stream heat exchange processes with multi-node coupling method

ZHANG Pu; ZHOU Li; GUO Kaihua; CHEN Zhenghua; WANG Weijie

doi:10.11949/j.issn.0438-1157.20181120

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Dynamic simulation on cryogenic multi-stream heat exchange processes with multi-node coupling method

更新时间：2025-12-10

- Dynamic simulation on cryogenic multi-stream heat exchange processes with multi-node coupling method
- CIESC Journal Issue S2, Pages: 167-173(2018)
- 作者机构：
  
  1. 中国石油西南油气田分公司天然气研究院,四川,成都,610213
  2. 中国石油天然气集团公司天然质量控制与能量计量重点实验室,四川,成都,610213
  3. 中山大学工学院,广东,广州,510006
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20181120
  CLC： E646TB657.5
- Online First：31 December 2018，
  
  Published：31 December 2018
- 稿件说明：
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ZHANG Pu, ZHOU Li, GUO Kaihua, et al. Dynamic simulation on cryogenic multi-stream heat exchange processes with multi-node coupling method[J]. CIESC Journal, 2018, (S2): 167-173.
DOI：

ZHANG Pu, ZHOU Li, GUO Kaihua, et al. Dynamic simulation on cryogenic multi-stream heat exchange processes with multi-node coupling method[J]. CIESC Journal, 2018, (S2): 167-173. DOI： 10.11949/j.issn.0438-1157.20181120.

摘要

多股流换热器是气体液化低温系统的核心部件，其工作性能对低温系统的降温特性和热力效率的影响显著。基于气液两相的容积节点原理建立多节点耦合的混合工质低温换热器动态模型及计算方法，对多股流换热器动态降温特性进行研究，重点分析换热器的漏热率和（屯液）液位波动对系统降温特性的影响。研究结果表明漏热对启动过程降温特性影响不大，而在降温至低温区时较为显著。换热器液位波动对系统动态降温特性会有显著影响，低温多股流换热器通道内液位波动会引起循环工质组分、有效制冷量、降温速度的波动，从而造成系统降温速度显著偏离优化工作状态，效率降低。这表明在混合工质低温多股流换热器的设计和操作过程中应尽量采取措施，以避免通道内积液波动现象出现。

Abstract

Multi-Stream Heat Exchanger (MSHE) is the core component of gas liquefaction system

its working performance can significantly affect the cooling characteristics and thermal efficiency of system. Based on the principle of two-phase volume node

this article established dynamic simulation method for Mixed-Refrigerant (MR) cryogenic system with a Multi-Node Coupling (MNV) MSHE model. The study results reveal that the heat leak's influence on cooling characteristics of MSHE is negligible during start-up process

while significant and can't negligible in low temperature situation. The liquid-level oscillation in MSHE channel can significantly impact the cooling characteristics

and induce the circulating MR composition shift

cooling capacity and cooling-down rate oscillation in further

which may deteriorate the cooling performance of the MSHE. The results suggest that measures should be taken in design and operation process to avoid the liquid level oscillation phenomenon in MR low-temperature MSHE channels.

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