Dynamic simulation of a helium liquefier

被引:0
|
作者
Maekawa, R [1 ]
Ooba, K [1 ]
Nobutoki, M [1 ]
Mito, T [1 ]
机构
[1] Natl Inst Fus Sci, Gifu 5095292, Japan
来源
ADVANCES IN CRYOGENIC ENGINEERING, VOLS. 49A AND B | 2004年 / 710卷
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中图分类号
O414.1 [热力学];
学科分类号
摘要
Dynamic behavior of a helium liquefier has been studied in detail with a Cryogenic Process REal-time SimulaTor (C-PREST) at the National Institute for Fusion Science (NIFS). The C-PREST is being developed to integrate large-scale helium cryogenic plant design, operation and maintenance for optimum process establishment. As a first step of simulations of cooldown to 4.5 K with the helium liquefier model is conducted, which provides a plant-process validation platform. The helium liquefier consists of seven heat exchangers, a liquid-nitrogen (LN2) precooler, two expansion turbines and a liquid-helium (LHe) reservoir. Process simulations are fulfilled with sequence programs, which were implemented with C-PREST based on an existing liquefier operation. The interactions of a JT valve, a JT-bypass valve and a reservoir-return valve have been dynamically simulated. The paper discusses various aspects of refrigeration process simulation, including its difficulties such as a balance between complexity of the adopted models and CPU time.
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页码:192 / 199
页数:8
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