Set-up of the cryogenic phase equilibria test stand CryoPHAEQTS

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Tamson, J.^1 ; Stamm, M.^2 ; Grohmann, S.^1^2

Karlsruhe Institute of Technology (KIT), Institute of Technical Thermodynamics and Refrigeration, Engler-Bunte-Ring 21, Karlsruhe

76131, Germany^1

Karlsruhe Institute of Technology (KIT), Institute of Technical Physics, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen

76344, Germany^2

关键词: Calorimetric methods;    Cryogenic mixed-refrigerants;    Equilibrium measurements;    Hydrogen liquefaction;    Optical measurement systems;    Solid liquid equilibrium;    Surface light scatterings;    Vapor-liquid-liquid equilibrium;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012087/pdf
DOI  :  10.1088/1757-899X/502/1/012087

来源: IOP

【 摘 要 】

The design of processes using cryogenic fluid mixtures requires fluid property data, which is unavailable today. In particular, this data is crucial to develop cryogenic mixed-refrigerant cycles for high-Temperature superconductor (HTS) applications and to further optimize hydrogen liquefaction processes. CryoPHAEQTS, which is currently being built at KIT, will provide physical property data for fluid mixtures in a temperature range of 15-300K and at pressures up to 15 MPa, including also mixtures with either flammable or oxidizing components (e.g. hydrogen, deuterium, oxygen). By direct sampling from an equilibrium cell, vapor-liquid equilibria (VLE) and vapor-liquid-liquid equilibria (VLLE) can be determined using gas chromatography. Solid-liquid equilibria (SLE) are measured using a calorimetric method. The measurement of heat capacities is implemented by combining two different flow measurement principles. In addition, the test stand offers optical access for a future upgrade with an optical measurement system that allows in-equilibrium measurements of both bulk transport properties by dynamic light scattering (DLS) and surface tension by surface light scattering (SLS).Published under licence by IOP Publishing Ltd.