A test device and test method for testing the thermal mechanical properties of a safety valve

Abstract

The invention relates to a test device and test method for measuring heat-state mechanical performance of a safety valve. A steam source is provided through a boiler, the pressure of an energy storage 3 is larger than that of an experimental container 4, rapid supplementing and cutting off of the steam of the experimental container of the safety valve can be achieved through a large-diameter adjusting valve, stable emission of the safety valve is kept, meanwhile, a rapid air release valve is controlled, and frequency hopping in the test process of the safety valve is avoided. According to a laser measuring device, the opening state test with the measuring precision of 10ms of the safety valve can be achieved, a non-contact type electromagnetic device measures the open high numerical value of the safety valve, and a high-pressure steam pressure measuring device measures pressure of the experimental container. Different scanning periods are set in the test state and the preparing state of the safety valve through the control system, mechanical performance relevant parameters of the safety valve are precisely measured, and the data handling capacity is also considered. The test device and test method of the heat state of the safety valve have the advantages of preventing frequency hopping of the safety valve, being high in measuring precision, high in safety, stable in system running and high in automation degree.

Description

technical field [0001] The invention relates to a test device and a test method for testing the thermal mechanical performance of a safety valve, in particular to a thermal mechanical performance test device and method for a safety valve based on a supplementary method. Background technique [0002] Safety valve is a main pressure release device to prevent system overpressure, ensure personnel safety and equipment safety; it is the main safety accessory on boilers, pressure vessels, and pressure pipelines, and plays the final role in the safe operation of boilers, pressure vessels, and pressure pipelines. A protective barrier. In order to ensure the quality of safety valve products, high-precision safety valve full test devices and methods are required. [0003] Safety valve is "small valve, big bench". The safety valve thermal test bench includes boilers, containers, control valves and control systems. The cost is nearly 100 million yuan, and the test technology is far mo...

AI Technical Summary

Problems solved by technology

The "free expansion method" does not meet the requirements of the ASME PTC 25 standard, and has the following disadvantages: (1) it cannot meet the requirements for stable discharge during the test of high-parameter, large-displacement safety valves; (2) the use of the free expansion method causes the setting The measured values ​​of pressure and discharge pressure are the same, and the discharge pressure cannot be accurately measured; (3) The rated opening height measured by the safety valve is lower than the actual value

However, during the test, the steam released from the upper part of the safety valve will greatly interfere with the laser, and it is difficult to accurately measure the opening height of the safety valve with the laser

[0012] The utility model patent CN201259471Y introduces the adjustable displacement exhaust pipe device for safety valve test, which solves the problem that the existing safety valve test exhaust pipe device cannot be used directly with safety valves of different specifications and models, and the displacement of the exhaust pipe cannot be adjusted. The problem

[0013] To sum up, the current thermal test technology for high temperature, high pressure, and large diameter safety valves has serious defects.

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