Performance failure testing device and method for low-temperature valve for LNG

Abstract

A performance failure testing device for a low-temperature valve for LNG comprises a medium gas source supply system, a closed box and a low-temperature valve testing station. The low-temperature valve testing station is positioned in the closed box; and the low-temperature valve testing station is provided with a driving mechanism and a to-be-tested low-temperature valve connected with the driving mechanism. A nitrogen concentration sensor, a temperature sensor and a gas outlet pipe are mounted on the side wall of the closed box. The medium gas source supply system comprises a raw material storage tank, a raw material gas supply main pipe and a plurality of branch distribution pipes, wherein an inlet of the raw material gas supply main pipe is connected with the raw material storage tank,a manual valve is installed on the raw material gas supply main pipe, an outlet of the raw material gas supply main pipe is connected with the branch distribution pipes, a valve and an electromagnetic valve are installed on each branch distribution pipe, and an outlet of each electromagnetic valve is connected with the to-be-tested low-temperature valve through a gas inlet pipe. According to themethod, the application performance of the low-temperature valve for LNG under the premise of normal work can be ensured to be measured and quantitatively evaluated, the test process is safe and reliable, the front and back test sequences are reasonably connected, the test time is short, and test media can be saved.

Description

Technical field: [0001] The invention belongs to the technical field of liquefied natural gas gas supply, and in particular relates to a performance failure test device and a test method of a low-temperature valve for LNG. Background technique: [0002] In recent years, liquefied natural gas has been widely used as a clean energy source, and the market demand for low-temperature valves suitable for LNG transportation is also increasing. As an important node in the LNG gas supply system, low-temperature gas valves are restricted by their performance and reliability. The overall safety of the LNG gas supply system. [0003] However, the reliability and life test devices and methods of cryogenic valves proposed in the current standards and literature are mostly external cooling, and the external refrigerant is used to conduct a cooling test on the valve. This test method is suitable for simulating the external environment. The mechanism of performance failure is not targeted e...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of sealing and locking failure caused by the difference between the test and the actual working conditions in the existing external cooling method, the present invention provides a performance failure test device for low temperature valves for LNG. Under the operating frequency and gas operating conditions, based on the dynamic driving device in the system, the valve time is adjusted to form different low-temperature working hours. At the same time, through the nitrogen concentration sensor on the low-temperature valve tooling and the valve torque and flow monitoring system of the test device system, To obtain quantified adaptability and its performance change curve

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