Method, device and system for detecting leakage of storage tank

Abstract

The embodiment of the invention provides a method, device and system for detecting leakage of a storage tank, and belongs to the technical field of storage tank safety detection. The method comprises the following steps of acquiring a first optical signal carrying the optical fiber position information after passing through an optical fiber; acquiring a second optical signal carrying the optical fiber position information after passing through the optical fiber; controlling the first optical signal to be coherent with a reference optical signal to obtain a coherent optical beat frequency signal; respectively processing the coherent light beat frequency signal and the second light signal to obtain a relative frequency shift corresponding to the coherent light beat frequency signal and a Rayleigh scattering phase change and a light intensity change corresponding to the second light signal; determining a state cloud picture based on the relative frequency shift; determining a vibration parameter based on the Rayleigh scattering phase change and the light intensity change; and judging whether the storage tank leaks or not based on the state cloud picture, the vibration parameters and leakage judgment conditions.

Description

technical field [0001] The invention relates to the technical field of storage tank safety detection, in particular to a method, device and system for detecting leakage of a storage tank. Background technique [0002] With the continuous and rapid development of my country's economy, the scale of petroleum processing and hazardous chemical production continues to expand, and the storage capacity of related raw materials, intermediate products and finished products continues to increase. Storage tanks are an important type of storage container structure. There are nearly 10,000 tanks, and more than 10,000 storage tanks in the refining and chemical industry. At the same time, in order to avoid national security risks brought about by energy supply, my country has built 9 national oil reserve bases including Zhoushan, Zhenhai, Dalian, and Huangdao. 100,000 square storage tanks have become the mainstream. It is estimated that before 2020, the country will add nearly 1,000 storag...

AI Technical Summary

Problems solved by technology

Among them, the online detection technology of storage tank robots has a high degree of automation and high detection efficiency, but it is not suitable for the detection of crude oil storage tanks with thick sediment layers and complex heaters; the online detection of guided waves on the bottom plate of storage tanks is not affected by the liquid in the tank. impact, but the detection signal attenuation is large and lacks the ability to detect the center of the tank bottom; the acoustic emission method uses the elastic wave signal sent out when the storage tank is corroded and leaked for damage judgment, without stopping production and opening the tank, and properly arranging sensors outside the tank Realize the monitoring of storage tanks, real-time, dynamic and online detection and evaluation of corrosion and leakage of the storage tank bottom plate, but still limited by the attenuation of the signal and lack the ability to detect the center of the tank bottom

More importantly, the medium of the storage tank is flammable and explosive, and the requirements for the explosion-proof safety level of the online detection method are very high, and these detection systems are often difficult to meet the explosion-proof requirements

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