Pressure Regulation Process of LNG Storage Tank

First of all, the LNG storage tank pressure regulation process is an operation to adjust the saturated vapor pressure of LNG in the LNG storage tank before adding gas to the LNG car. There are two types of submersible pump pressure regulation processes. Next, we also want to tell you about the pressure regulation process of lng storage tanks, mainly including submersible pump pressure regulation process and self-boosting pressure regulation process, please check the next analysis.

(1) Submersible pump pressure regulation process LNG liquid enters the submersible pump through the liquid outlet of the LNG storage tank, and is pressurized by the submersible pump and then enters the booster gasifier for gasification, and the gasified natural gas passes through the gas phase pipe of the LNG storage tank. Return to the gas phase space of the LNG storage tank to regulate the pressure of the LNG storage tank. When a submersible pump is used to regulate the pressure of the LNG storage tank, the inlet pressure of the booster gasifier is the outlet pressure of the submersible pump. The maximum outlet pressure of the TC34 submersible pump of a company in the United States is generally set to 1.2 MPa, the outlet pressure of the booster gasifier is the gas phase pressure of the storage tank, which is about 0.6 MPa. The inlet pressure of the booster gasifier is much higher than its outlet pressure, so the submersible pump is used for fast pressure regulation, short pressure regulation time and high pressure.
(2) Self-pressurization and pressure regulation process The LNG liquid enters the pressurized gasifier directly from the liquid outlet of the LNG storage tank for gasification, and the gasified gas returns to the gas phase space of the LNG storage tank through the gas phase pipe of the LNG storage tank, which is used for LNG storage. Tank pressure regulation. When this pressure regulation method is selected, the inlet pressure of the booster gasifier is the gas phase pressure before the pressure regulation of the LNG storage tank and the liquid column static pressure generated by the liquid in the tank (about 30 m3 when the storage tank is full. 0.01 MPa), the outlet pressure is the gas phase pressure of the LNG storage tank (about 0.6 MPa), so the self-boosting and pressure-regulating process is slow and low in pressure.
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