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Using of polyamide in construction of supporting blocks of cryogenic tanks on example of LNG container

Lisowski E., Czyżycki W., Łazarczyk K.

Archives of Foundry Engineering

2010

Vol. 10, iss. 3 spec.

81--86

Interest in using of cryogenic gases is increasing recently. It particularly applies to LNG (Liquefied Natural Gas), which is relatively inexpensive and environmental friendly. In the liquefied form this gas is highly compressed. One cubic meter of liquefied LNG can be expanded to 660 cubic meters of normal usable gas. At the atmospheric pressure, the liquefaction temperature of LNG is under minus 160 Celsius degrees. Therefore, there is a necessity to store it in a cryogenic tank. A system of reloading port terminals is built in several UE countries, as Spain, Italy. The LNG is delivered to these terminals using the adequately equipped ships. However, there are significant problems with delivering LNG to recipients not connected to the gas network directly. Delivering of liquefied LNG to recipients using the road or rail transport is one of the simplest solutions of this problem. This kind of transport is possible only with using suitable tanks with the adequate insulation and fulfilling the transport requirements. Many scientific research centers carry out investigations on high insulating-power materials. The problem to design and build universal container for road and rail transport was taken on by Cracow University of Technology together with the company Chemet from Tarnowskie Góry. Designed cryogenic tank is a two-walled construction with the vacuum between them. Distance between walls is provided by system of supporting blocks made of plastic. This paper presents problem of heat transfer between the walls through the supporting blocks. The investigations were carried out both: numerically, using the finite element method and experimentally, using the especially designed and built laboratory test stand, which allowed to determine heat transfer coefficient.