Furnace tube carburized layer thickness evaluation method and system based on magnetic field disturbance and magnetic force dual-detection ring

Abstract

The invention discloses a furnace tube carburized layer thickness evaluation method and system based on a magnetic field disturbance and magnetic force dual-detection ring. Two principles of magneticfield disturbance and magnetic force detection are adopted, and the system is composed of an upper computer, a main control box, a magnetic field disturbance circular ring array sensor, a magnetic force detection circular ring array, a crawler-type pipeline climbing device and the like, and can be used for evaluating the thickness of the an inner wall carburized layer of an ethylene cracking furnace tube. In the process that the crawler-type pipeline climbing device carries the magnetic field disturbance circular ring array sensor and the magnetic force detection circular ring array to climb and advance along a furnace tube, and a Hall element of a magnetic field disturbance sensor unit detects the magnetic field intensity of the surface of the furnace tube in the bus direction so as to reflect the magnetic field distribution disturbance degree provided by the inner wall carburized layer to a permanent magnet; and a thin film pressure sensor of a magnetic force detection sensor unit measures the magnitude of the interaction magnetic force of the permanent magnet and the furnace tube. The thickness of the inner wall carburized layer in the circumferential direction and the bus direction of the furnace tube is quantitatively evaluated by utilizing the detected change curve of the magnetic field intensity and the magnetic force in the scanning direction.

Description

technical field [0001] The invention belongs to the technical field of non-destructive testing, and relates to a method and system for evaluating the carburized layer thickness on the inner wall of a furnace tube based on a magnetic field disturbance and a magnetic double detection ring. Non-destructive testing and evaluation. Background technique [0002] Ethylene cracking furnace is the key equipment in the production of ethylene, an important basic raw material in the petrochemical industry. As the core component of the ethylene cracking furnace, the ethylene cracking furnace tube works in high temperature and complex chemical environment. Under the action of high carbon potential and thermal stress, ethylene cracking furnace tubes are prone to carburization, coking and thermal fatigue damage, seriously affecting the safety and life of ethylene production equipment. According to statistics, the carburized layer formed by carburizing the furnace tube is an important reas...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a furnace tube carburized layer thickness evaluation method and system based on magnetic field disturbance and magnetic double detection rings, to solve the problems of continuous scanning, low efficiency and low accuracy of detection results in the prior art

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