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Dynamic Simulation of Helium Liquefiers using Aspen Hysys®: Problems, Solutions and Prospects Dutta Rohan1, Thomas Rijo J1, Ghosh Parthasarathi1, Chowdhury Kanchan1 1Cryogenic Engineering Centre, Indian Institute of Technology Kharagpur, India Abstract This paper deals with the application of dynamic simulation of helium refrigerators and liquefiers by a general purpose process-simulator Aspen Hysys®. A standardhelium iiquefier for capacities of 100 L/hr and 50 L/hr with and without liquid nitrogen pre-cooling respectively, have been chosen for validation of the code of Aspen Hysys®. To obtain an accurate simulation result we need appropriate equation of state, accurate transport properties of helium and thermal properties of metai, actual equipment specifications and cooi-down sequence with appropriate control, in the present work, the limitations of Aspen Hysys® in simulating helium systems have been identified and techniques to overcome these problems have been discussed. The dynamic simulation has been performed following the above techniques in order to obtain cool-down profiles. The cool-down process has been simulated from 300K to 8 K showing similar trends in the temperature variations at different state points. However, it has not been possible to get below the level of 8 Kand the solution diverges at this temperature. The reasons for this divergence are under investigation and future efforts would be made to achieve a complete cool-down process simulation. To conclude, it may be said that, despite the limitations of Aspen Hysys®. and non-availability of many vital specifications of equipment of plant, we are optimistic about the applicability of Aspen Hysys®. as dynamic simulator for simulation of helium systems down to its liquefaction point. Top Keywords Dynamic simulation, Helium refrigerator and Iiquefier, Aspen Hysys®, Parameter estimation. Top | | | |
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