LNG self-pressurization storage tank

Abstract

The invention discloses an LNG self-pressurization storage tank, and relates to the technical field of self-pressurization liquid supply storage tanks for laboratories. A liquid storage tank body of the LNG self-pressurization storage tank is composed of a stainless steel inner container, a stainless steel outer shell, a vacuum insulation interlayer and a valve pipeline, the valve pipeline is arranged at the top of the liquid storage tank body, a pressure sensor, a temperature sensor and a liquid level sensor in an auxiliary thermal pressurization device are arranged at the top of the liquid storage tank body, the pressure sensor, the temperature sensor, the liquid level sensor and a power supply are electrically connected with a control unit correspondingly, a thermal resistor is arrangedon the outer surface of the stainless steel inner container, the outer surface of the thermal resistor is covered with an isolation and heat insulation covering layer, and the thermal resistor is electrically connected with the power supply and the control unit. The LNG self-pressurization storage tank has the advantages that the vaporization degree of LNG in the tank is controlled through the size of the power of the thermal resistor so that the pressure, the liquid level, the temperature and other physical states in the tank can be relatively accurately controlled, the operation is simplerand more convenient, the heat loss of the thermal resistor can be reduced through the isolation and heat insulation covering layer, and the waste is reduced.

Description

technical field [0001] The invention relates to the technical field of laboratory self-pressurized liquid supply storage tanks, in particular to an LNG self-pressurized storage tank. Background technique [0002] The initial liquefied natural gas filled into the liquid storage tank is generally under normal pressure. When using it, the storage tank needs to be self-pressurized first. When the pressure increases to the required pressure range for liquid discharge, the liquid discharge will start. air supply. The basic principle of self-pressurization is to discharge the low-temperature liquid in the storage tank, vaporize it through the vaporizer, and then return to the gas phase space of the self-storage tank. Since the specific volume of the gas is much larger than that of the liquid, the gas can be used to squeeze the LNG in the storage tank to achieve the purpose of pressurizing the storage tank. [0003] The self-pressurization system of the liquid storage tank in the ...

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Problems solved by technology

[0003] The self-pressurization system of the liquid storage tank in the prior art only controls the liquid intake and self-pressurization action through the switch of the manual valve, the pressure in the storage tank fluctuates greatly, and the pressure and flow cannot be accurately controlled

CN201720938193.4 discloses a rapid self-pressurization pipeline for low-temperature storage tanks, which realizes self-pressurization through the upper anti-gas sealing pipe, liquid phase shut-off valve, gasification supercharger, booster pump, and gas phase shut-off valve, increasing output The liquid volume improves the utilization efficiency of the storage tank, but it needs to use an external energy booster pump and a gasification booster, and the pressure fluctuates greatly, so the pressure and flow cannot be controlled

[0004] Universities and research institutes that use LNG as their research direction, LNG tests will involve different working conditions such as pressure and flow, and the existing storage tanks cannot well meet the needs of the laboratory

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