Y-type double-FBG (fiber Bragg grating) optical fiber vibration sensor for online monitoring hydraulic decoking of coking tower

Abstract

The invention discloses a Y-type double-FBG (fiber Bragg grating) optical fiber vibration sensor for online monitoring hydraulic decoking of a coking tower. The Y-type double-FBG optical fiber vibration sensor comprises a vibration guide rod (2), a heat-radiating structure (3), a Y-type vibrating member (4), a sealing shell (5), a counterweight body (6), fiber Bragg gratings and a connecting base (1) supporting the whole sensor, a contact probe (10) at the left end of the vibration guide rod closely contacts with the wall of the coking tower, the heat-radiating structure is fixed on the vibration guide rod, the sealing shell is assembled on a fixing member (11) at the right end of the vibration guide rod through a screw port, the counterweight body and the Y-type vibrating member are positioned in the sealing shell, the first fiber Bragg grating is led out from one end of the Y-type vibrating member and then fixed on the sealing shell, and the second fiber Bragg grating is led out and pre-stretched from the other end of the Y-type vibrating member and then fixed on the sealing shell. The Y-type double-FBG optical fiber vibration sensor has the advantages of high response frequency, wide measuring range, safety in nature and the like, and can collect high-frequency vibrating signals generated when high-pressure water strikes the wall of the coking tower in the process of hydraulic decoking so as to complete hydraulic decoking process.

Description

technical field [0001] The invention relates to the field of sensing technology, in particular to a Y-type double FBG optical fiber vibration sensor for on-line monitoring of hydraulic decoking of coking towers in the petrochemical industry. Background technique [0002] The coking tower is one of the important equipment of the delayed coking unit in the oil refining industry. It is mainly used in the last link of production in petrochemical oil refining enterprises. The principle of hydraulic decoking is to use the powerful impact of high-pressure water jets from the nozzle of the hydraulic coke cutter The coke is cut off by force, and the nozzle of the hydraulic coke cutter moves up and down and rotates in the tower to make the coke in the tower fall off until all the coke in the coking tower is completely removed. At present, in the production process of the domestic petrochemical industry, almost all operators judge whether the coke in the coking tower is removed by obse...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a Y-type double FBG optical fiber vibration sensor for on-line monitoring of coking tower hydraulic decoking in view of the above-mentioned defects in the prior art. Solve the problem that the thickness of the coke layer is difficult to distinguish in the monitoring system of the hydraulic decoking of the coking tower. At the same time, the optical fiber sensor can not be affected by temperature, electromagnetic interference, etc., and it is safer and more convenient to use

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