LNG (Liquefied Natural Gas) detecting device and detecting method thereof

Abstract

The invention discloses an LNG (Liquefied Natural Gas) detecting device and a detecting method thereof. The device comprises a laser, a wavelength switching filter disc, a detector, an amplifier and a processor, wherein the laser, the wavelength switching filter disc, the detector, the amplifier and the processor are integrally mounted on one instrument board; the output end of the detector is connected with the input end of the processor after passing through the amplifier; two input ends of the processor are respectively connected with a computer and a stepper motor; the stepper motor is connected with the wavelength switching filter disc through a shaft connector. The device adopts a distributive feedback laser with 1668 nm of wave band as a light source, and uses an infrared spectroscopy method to detect the methane absorption peak; the reflected laser has obvious features; the detecting method is a quick and precise method for detecting gas at present, and can detect the concentration of the LNG in the range of 1.6-100%; the detecting device can be mounted on a helicopter or a fixed wing aircraft to totally realize the actual field detection, has high laser strength and far detecting distance, and can implement the all-weather detection.

Description

technical field [0001] The invention relates to an LNG detection device, in particular to an LNG detection device and a detection method thereof. Background technique [0002] The world's demand for natural gas has made the long-distance natural gas maritime transportation industry flourish. Most of the liquefied natural gas (LNG for short) transported by ships is cooled into cryogenic liquefied natural gas for storage and transportation. LNG ships are dangerous goods ships, which may lead to accidental leakage of liquids in the event of an emergency. A large amount of low-temperature LNG liquid leaks from the liquid cargo tank, and the contact with the hull will cause brittle fracture of the hull, and the mass transfer and heat transfer reaction will occur when it contacts with sea water, LNG will absorb heat and boil, and there will be ice formation in the sea area, and at the same time, it will boil The produced LNG accumulates on the sea surface and will explode or cat...

AI Technical Summary

Problems solved by technology

[0003] The existing detection methods are as follows: traditional contact combustion and semiconductor absorption methane sensors are susceptible to interference from other gases; interferometric methods are affected by gas humidity and pressure; electrochemical methods have the shortest life, only 1 to 2 years; and , none of the existing detection methods can achieve long-distance detection

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