Research on algorithm for temperature change law of LNG storage tank during pre-cooling
To precisely control the temperature decline rate of liquefied natural gas(LNG)storage tanks during the pre-cooling process,guarantee pre-cooling process safety,and minimize the pre-cooling medium application,it is necessary to develop an internal pre-cooling model of the storage tank to forecast temperature change law of the storage tank during pre-cooling process.By taking into account external factors such as air convection and solar radiation,the heat loss from the tank top,wall,and bottom during the pre-cooling process was analyzed.Grounded in the principle of energy balance,an iterative calculation model of temperature changes for the LNG tank during the pre-cooling process was constructed,and the change law of the average temperature during the pre-cooling process was revealed.The calculation results exhibited a relative error of 20％when compared to on-site data from LNG receiving stations.In view of the diverse temperature change laws at different locations within the tank,the influencing factors of temperature changes at distinct positions within the tank were analyzed.By integrating on-site temperature measurement point data within the storage tank in LNG receiving stations,empirical correlation equations for temperature changes at different locations within the tank were deduced and fitted.The calculation results obtained through these empirical correlations were validated,demonstrating a reduction in the relative error to less than 12％when compared with on-site data from LNG receiving stations.This holds significant guidance and reference value for accurately controlling the pre-cooling process of LNG storage tanks and saving LNG consumption.
LNG receiving stationstorage tanksLNG spray for pre-coolingtemperature changeempirical correlation equations
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