Pressure monitoring method for liquid level of vehicle-mounted liquefied natural gas tank

An LNG tank and LNG technology, which are applied in the container discharge method, container filling method, gas/liquid distribution and storage, etc., can solve problems such as maintenance difficulties and vehicle-mounted LNG tank liquid level monitoring, etc., to facilitate fault maintenance. Effect
CN104896304BActive Publication Date: 2017-03-08江苏省特种设备安全监督检验研究院张家港分院
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
江苏省特种设备安全监督检验研究院张家港分院
Publication Date
2017-03-08

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Abstract

The invention discloses a pressure monitoring method for a liquid level of a vehicle-mounted liquefied natural gas tank. The method is characterized in that the liquefied natural gas tank is connected with an automobile bottom plate through an elastic support, and the gravity center of the liquefied natural gas tank coincides with the rigidity center of the elastic support; a pressure sensor collects a pressure signal of the elastic support, the proper time duration is selected, time average is carried out on collected total pressure, and a pressure average value is close to mass of a system; and a processor compares the mass with the mass of the system in the no-load process of the liquefied natural gas tank so as to obtain the stock mass of liquefied natural gas, and a liquid level value is determined. According to the method, when a vehicle is static, the liquid level of the liquefied natural gas is monitored, and when the vehicle runs, the liquid level can be monitored in real time, and failure maintenance is facilitated.
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Description

technical field

[0001] The invention relates to a method for monitoring the liquid level of a liquefied natural gas tank, in particular to a method for monitoring the pressure of the liquid level of a vehicle-mounted liquefied natural gas tank. Background technique

[0002] Liquefied natural gas tanks are used to store liquefied natural gas, and the current monitoring device for liquid level of liquefied natural gas is a capacitor embedded type. The capacitive sensor is pre-installed in the vacuum-sealed liquefied natural gas tank. The level of the liquefied natural gas liquid makes the sensor produce different capacitances. The current capacitance is calculated in real time according to the initial capacitance at no-load and the capacitance at full load. Liquefied natural gas level. Since the capacitive sensor needs to be pre-installed inside the tank body, it is easy to cause damage to the capacitive sensor during the process of sealing and vacuumizing the LNG tank. Afte...

Claims

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