Valve leakage testing system and valve leakage testing method based on infrared thermal imaging technology

Abstract

The invention provides a valve leakage testing system and a valve leakage testing method based on infrared thermal imaging technology, wherein the valve leakage testing system and the valve leakage testing method belong to the field of valve monitoring technology. The valve leakage testing system and the valve leakage testing method settle the following technical problems in a valve: high difficulty in realizing middle-and-long-distance leakage testing, infrared thermal imaging technology limitation by interference of emissivity non-uniformity, infrared thermal imaging result interference by temperature condition change, relatively low valve leakage testing precision, relatively high testing cost, etc. Middle-and-long-distance pressure-testing leakage testing of the valve is searched. Advantages of non-contact temperature testing and quick capture for overhot points in infrared thermal imaging technology are applied in leakage testing. Accurate measurement for leakage point position and grading analysis on leakage amount are realized. A technical problem of interference caused by emissivity non-uniformity is settled. Furthermore the valve leakage testing system and the valve leakage testing method have advantages of high testing precision, reasonable testing cost, and good popularization prospect.

Description

technical field [0001] The invention belongs to the technical field of valve supervision and inspection, in particular to a valve leakage detection system and method using infrared thermal imaging technology and MATLAB post-processing analysis. Background technique [0002] Valves are widely used in petroleum, chemical industry, power stations, long-distance pipelines, nuclear industry, aerospace and many other fields. It is precisely because of the particularity of their application fields and the frequent serious safety accidents that they put forward extremely high requirements on the quality of valves. . In August 2007, the Quality Inspection Special Letter [2007] No. 35 "Notice on Carrying out Special Rectification Pilot Work for Pressure Pipeline Valve Manufacturing" required that Shanghai, Zhejiang Province, Henan Province, and Liaoning Province, where valve manufacturing enterprises are relatively concentrated, carry out valve trial work. Supervisory inspection; On ...

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Problems solved by technology

[0004] In the current supervision and inspection process of valves, the leakage detection method of manually smearing soap bubbles is still used, which mainly relies on close-up observation with the naked eye. Safety accidents are prone to occur during the detection of high-temperature and high-pressure working fluids, and the detection accuracy is low.

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