Study Of Prediction On Cryogenic Insulation Cylinder Evaporation Rate

Cryogenic insulation cylinder is new storage containers which maintain gas liquefaction, witha simple filling, storage and transportation, high efficiency, low operation cost, easy to use andother advantages, has been widely used to replace the traditional Dewar and high-pressure steelcylinders in recent years. The safe and reliable operation of cryogenic insulation cylinder dependslargely on the cylinder of the insulation performance, and the evaporation rate is one of theimportant measure indicators of thermal insulation performance of gas cylinders, it is a maininspection items test of cylinders on a regular basis.This article discusses the structure of cryogenic insulation cylinder, materials, andmanufacturing, use and supervision of the status quo, analyse the progress of evaporationrate.evaporation rate for the current detection time is too long, testing the depth of such issues isnot enough,to181L high-vacuum multi-layer insulation cylinder as the object of study, carried outevaporation rate detection research..The study, with nitrogen as working fluid, testing verified the full rate, environmental stress,environmental temperature and other factors on the impact of low-temperature liquid evaporationrate conditions defined by full rate of50%for evaporation rate detection is reasonable.The use of heat transfer theory, carried out a cryogenic insulation cylinder and itscomponents heat loss analysis;The results of the cryogenic insulation cylinder evaporation ratetheoretical calculation show that there is a big error compared with the measured evaporation ratebecause the evaporation rate of the existing model of cylinders in use is difficult to take intoaccount the deterioration situation of the structure and materials. In order to obtain more accuratevalues of cryogenic insulation cylinder evaporation rates, evaporation rates should be tested byexperiment.Combination of evaporation rate test, using a linear model, exponential model, power lawmodel and the gray system GM (1,1) model for the prediction experiment of the evaporationrate,choose optimization linear model and gray system GM (1,1) model. The two prediction model has higher prediction accuracy, simple and convenient, easy to use and so on. In particular, thegray prediction method can only take four data points to predict the required sample size is small,more universal.Through thermal imaging non-destructive testing technology and heat transfer theoryresearch, established the failure criterion of a gas cylinder insulation performance, developed annew evaporation rate of detection methods based on advanced thermal imaging method. Thismethod is the use of thermal infrared imaging method to realize cryogenic insulation cylinderouter wall temperature field testing, through the outer wall cylinder heat exchange between theenvironment and to determine the cylinder leak heat and evaporation rates, and can also detect thecylinder micro-leakage and breakage situation.To achieve the low-temperature insulation cylinder management and the evaporation rate ofdetection efficiency and automation, based on the evaporation rate established by the grayprediction and linear prediction methods, and thermal imaging detection method, developedlow-temperature insulation cylinder evaporation rate auto-detection and information system thatshorten low-temperature thermal insulation cylinder evaporation rate of detection time for morethan a third.This work in improving detection of low-temperature insulation cylinder efficiency andutilization, reducing resource waste and environmental pollution, improving cylinder performance,extending cylinder life, has important practical value.