Abstract
In this paper, thermal properties of materials for evacuated insulation systems of double-walled cryogenic tanks were discussed. Than the comparison of insulation variants for LNG cryogenic road tankers was presented. The use of several layers of insulation made of materials such as aerogel and fiberglass or the use of multilayer isolation (MLI) has been compared to the use of perlite powder. The average heat flux through the tank walls and insulation system has been compared under different vacuum levels and in the absence of vacuum. The comparative analysis was performed by applying transient thermal analysis using finite element method.
Highlights
Typical cryogenic road tankers consist of inner vessel and outer jacket
The results of thermal analysis of 2D models show that multilayer insulation (MLI) system in comparison with other tested cryogenic insulation systems is the best performer in the high vacuum (HV) range under residual gas pressure of 10-3 Pa and in the soft vacuum (SV) range under pressure of 10-1 Pa
Cryogel® aerogel insulation blanket is the best performer in the range of no vacuum (NV) under pressure of 100 kPa
Summary
Typical cryogenic road tankers consist of inner vessel and outer jacket. The evacuated annular space in between is fully or partially filled by insulation system. The thermal performance of insulation system depends on applied materials and vacuum level. The vacuum level should be constantly controlled during tanks exploitation and improved in case of pressure increase. This paper discussed the influence of vacuum level on thermal performance of different insulation systems for LNG cryogenic road tankers
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