A gas valve internal leakage detection method based on acoustic emission signal processing

Abstract

The invention discloses a gas valve inner leakage detection method based on acoustic emission signal processing. Firstly, an acoustic emission sensor is used for collecting signals, filtering processing is conducted through a signal amplifier, enhanced acoustic emission analog signals are obtained, converted into digital signals through a data acquisition card and sent to a computer, and the computer records root-mean-square value parameters of the acoustic emission signals in real time; a one-point method acoustic emission signal collection inner leakage analyzing and judging method, a two-point method acoustic emission signal collection inner leakage analyzing and judging method and a four-point method acoustic emission signal collection inner leakage analyzing and judging method are adopted in sequence, and whether inner leakage exists on a valve or not is judged according to the root-mean-square value of valve inner leakage acoustic emission signals. The gas valve inner leakage detection method is applied to the field of gas valve inner leakage detection, has high practicability, is reasonable in cost and high in detection efficiency, does not affect normal production and reduces the influences, on production detection, of industrial noise.

Description

technical field [0001] The invention belongs to the technical field of gas valve internal leakage detection, in particular to a gas valve internal leakage detection method based on acoustic emission signal processing. Background technique [0002] The valve is an important equipment in the automatic control system and safety protection system of the petrochemical industry, and is called the "throat" of the petrochemical industry. Leakage due to production quality control, transportation and installation, use operation, corrosion and aging, etc., not only affects the quality and safety of petrochemical production, but also has a great impact on the energy efficiency of enterprises. For external leakage of the stuffing box, valve body, valve stem, valve body joints, etc., the leakage of the valve can be judged indirectly by detecting and analyzing whether there is leakage material according to the idea of ​​​​controlling leakage; for the leakage caused by the sealing surface a...

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Problems solved by technology

However, the problem of this method is that the system is complicated, the equipment cost is high, and it is not suitable for the environment with many valves in industrial production. Moreover, for valves with small diameters, it is difficult for tiny internal leakage to reflect changes in temperature and pressure. The signal is greatly affected by the position of the monitoring point, and it is difficult to filter out the influence of industrial noise when collecting ultrasonic signals at a single point

However, this method needs to install a combination valve on the combustible gas pipeline, and it needs to operate the valve. In the petrochemical industry, the detection efficiency of this method is low, and it affects normal production, so it is not suitable for application

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