The Research On Thermal Insulation Performance Evaluation Of Cryogenic Equipment

With the rapid development of the world industry, after the 1960s cryogenic technology has been an unprecedented development, due to the cryogenic liquid boiling temperature is lowand and its low latent heat of vaporization, so the storage and transportation process is extremely sensitive of heat leak, so part of the liquid evaporate will cause pressure increased.Once it’s over the pressure safety limit, the tank will be dangerous even destroyed, so the insulation performance of cryogenic equipment evaluation study has important theoretical and practical significance.Aiming at the presence of time, high costs, complicated process and other issues of our existing cryogenic vessel insulation performance evaluation,Main achievements are as follows:(1) The pressure field and evaporation rate of the airtight cryo-insulation have been obtained, by using FLUENT fluid analysis software.This paper establishs a corresponding relation between the rate of pressure rise and evaporation rates through the postprocessing of the result.(2)The pressure and evaporation are measured experimentally that deal with airtight cryo-insulation pressure vessels with different filiting ratio by using a closed cryogenic insulation container as experimental subjects.(3) The simulation value and test results were compared and analyzed, which proved the feasibility of the using the rate of pressure rise as the evaluation index and validity of the FLUENT model.(4) The objective function has been established by using dimensionless method which comprehensively considers the main factor such as:pressure rise rate, evaporation rate, filling rate. Solving the unknown parameters establishs a fitting function between a pressure rise rate and evaporation rate by using the particle swarm optimization algorithm.