Thermodynamic analysis and economical evaluation of two 310-80 K pre-cooling stage configurations for helium refrigeration and liquefaction cycle

Cryogenic Engineering Conference 2017

材料科学;物理学

Zhu, Z.G.^1 ; Zhuang, M.^1 ; Jiang, Q.F.^1,2 ; Zhang, Q.Y.^1 ; Feng, H.S.^1

Institute of Plasma Physics, Chinese Academy of Sciences, Hefei

230031, China^1

University of Science and Technology of China, Hefei

230026, China^2

关键词: Different operating conditions;    Discharge pressures;    Economical evaluation;    Exergy efficiencies;    Independent parameters;    Isentropic efficiency;    Pre-cooling;    Thermo dynamic analysis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012107/pdf
DOI  :  10.1088/1757-899X/278/1/012107

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In 310-80 K pre-cooling stage, the temperature of the HP helium stream reduces to about 80 K where nearly 73% of the enthalpy drop from room temperature to 4.5 K occurs. Apart from the most common liquid nitrogen pre-cooling, another 310-80 K pre-cooling configuration with turbine is employed in some helium cryoplants. In this paper, thermodynamic and economical performance of these two kinds of 310-80 K pre-cooling stage configurations has been studied at different operating conditions taking discharge pressure, isentropic efficiency of turbines and liquefaction rate as independent parameters. The exergy efficiency, total UA of heat exchangers and operating cost of two configurations are computed. This work will provide a reference for choosing 310-80 K pre-cooling stage configuration during design.