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Leakage monitoring and warning system of large fiber-grating liquid gas storage tank

A technology of liquefied gas storage tanks and optical fiber gratings, which can solve the problem of leakage of large liquefied gas storage tanks that is difficult to reach by detecting the appearance of fluid at the leak point, using liquid/vacuum degree for liquid tightness measurement, and measuring devices. Long-term, real-time online monitoring and early warning issues

Inactive Publication Date: 2010-12-08
WUHAN UNIV OF TECH
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Problems solved by technology

Obviously, this method is difficult to meet people's requirements for long-term, real-time online monitoring and early warning of large-scale liquefied gas storage tank leakage

Method used

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  • Leakage monitoring and warning system of large fiber-grating liquid gas storage tank
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  • Leakage monitoring and warning system of large fiber-grating liquid gas storage tank

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with the accompanying drawings.

[0039] According to the size of the storage tank and the space interval of the probes, determine the total number of fiber grating temperature probes, the number of groups of identical fiber gratings and the number of gratings of each group of identical fiber gratings, and use the same specification of optical fiber to make several groups of full Same as fiber grating.

[0040] These optical fiber grating temperature probes are connected at regular intervals to form probe strings, respectively surrounding each marking area installed on the same horizontal plane at the bottom of the tank wall. Among them, the first probe (0# probe) is used to monitor the ambient temperature, and the rest of the probes are installed close to the tank wall to monitor the temperature of the tank wall.

[0041] The optical fiber is used to connect the fiber grating temperature probe to the...

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Abstract

The invention relates to a leakage monitoring and warning system of a large fiber-grating liquid gas storage tank, which comprises a wideband light source, a Y-shaped optical splitter, a temperature probe string, a wavelength demodulator, a computing unit, and an acousto-optic warning device, wherein the temperature probe string comprises a plurality of bragg fiber gratings; the wideband light source is connected with one splitting port of the Y-shaped optical splitter through an optical fiber; the combining port of the Y-shaped optical splitter is connected with the probe string comprising the bragg fiber gratings through an optical fiber; the other splitting port of the Y-shaped optical splitter is connected with the wavelength demodulator in series though an optical fiber; data is transmitted to the computing unit by the wavelength demodulator through a data wire; and the computing unit is connected with the acousto-optic warning device through a lead. The changing situation of the temperature within the range of -100-100 DEG C on the tank wall of the large liquid gas storage tank is monitored in real time and on line through a fiber-grating sensing network, and when liquid gas leaks and the monitored temperature change of the fiber grating is caused to exceed a temperature-reduction threshold value, acousto-optic warning can be triggered by the system.

Description

technical field [0001] The invention relates to a novel sensing method and device for monitoring the leakage of liquefied gas in a large-scale liquefied gas storage tank. It adopts a fiber grating sensor network to monitor the temperature change of the target position on the large-scale liquefied gas storage tank in real time and realizes the monitoring of the large-scale liquefied gas storage tank. The invention relates to the monitoring and alarming of tank liquefied gas leakage, which belongs to the field of optical fiber sensing. Background technique [0002] There are two main types of liquefied gas. The product pressurized and liquefied from refinery gas is called liquefied petroleum gas, with a boiling point of -5 to -45°C under normal pressure; the product obtained by low-temperature condensation and compression of natural gas produced from oil and gas fields is called liquefied natural gas. The boiling point under normal pressure is -150~-160°C. As a high-quality ...

Claims

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Application Information

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IPC IPC(8): G01M3/04G01K11/32G01K11/3206
Inventor 姜德生袁银权王立新
Owner WUHAN UNIV OF TECH
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