Guided wave-based detection method for externally-attached liquid level switch of oil tank

Abstract

The invention provides an oil tank externally-pasted liquid level switch detection method based on guided waves. The method comprises the following steps that 1, a guided wave excitation element and a guided wave sensing element are pasted to the outer side of an oil tank; 2, when the liquid level of the oil tank does not reach the detection height, collecting and storing a guided wave signal; 3, when the liquid level of the oil tank changes, whether the liquid level of the liquid in the oil tank reaches or not is judged according to the guided wave signal, and therefore the guided wave excitation element and the guided wave sensing element are pasted to the position, needing to be detected, of the liquid level on the outer side of the oil tank; whether the liquid level reaches the detection height or not is known by comparing the energy change rate between the guided wave signal when the liquid level does not reach the liquid level detection height and the guided wave signal when the liquid level changes with a threshold value, and therefore the method has the advantages that holes do not need to be formed in the oil tank wall, and the structural integrity of the tank wall is not damaged.

Description

technical field [0001] The invention belongs to the technical field of liquid level monitoring, and in particular relates to a detection method for a liquid level switch attached to an oil tank based on guided waves. Background technique [0002] At present, the oil tank liquid level is an important control parameter in the management of oil depots. Both GB 50074-2014 "Code for Design of Oil Storage Depot" and GB 50737-2011 "Code for Design of Oil Reserve Depot" clearly stipulate that storage tanks with a capacity greater than 100m3 should be Set the liquid level alarm device. At present, the liquid level switches commonly used in oil depots mainly include: float type liquid level switch, capacitive liquid level switch, tuning fork liquid level switch, photoelectric liquid level switch, ultrasonic liquid level switch, etc. However, these liquid level switch detection methods need to open holes on the tank wall at the detection height, which destroys the structural integrity...

AI Technical Summary

Problems solved by technology

However, these liquid level switch detection methods need to open holes on the tank wall at the detection height, destroying the structural integrity of the tank wall, and it is difficult to adjust arbitrarily once installed

For oil tanks in service, the tank needs to be cleaned before installation, and it is a hot work, which is very inconvenient to use

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