There is no limit to creativity, great invention of instrument. Today we introduce a national patent for invention - an experimental device and test method for simulating leakage in gas valves. The patent was applied by the Qingdao Safety Engineering Research Institute of China Petroleum Chemical Co, and was authorized to announce in July 18, 2017.

Content description

       The invention belongs to the field of leak detection of petrochemical equipment, in particular to an experimental device and an experiment method for simulating the internal leakage of a gas valve.

Invention background

       Valve leakage traditional detection methods need to stop production, demolition and pressure and other processes, there is still a lack of on-line diagnosis of the valve leakage degree of effective methods and means. Foreign scholars have conducted a lot of research in recent years. Kaewwaewnoi W, Mostafapour A, Noipitak M, Meland E and wear light et al early results based on Lighthill is proposed to predict the valve leakage acoustic emission theory. As a new nondestructive testing technique, acoustic emission testing has proved to be a promising method.

       Because the petrochemical production equipment under complex conditions under different conditions, how to establish the relationship between the amount of leakage within the valve type, namely in the process parameters under certain conditions, to determine the amount of valve leakage based on acoustic emission signals, is a difficult problem in petrochemical enterprises.

       The application number is "CN 102928181 A" and the invention name is an analog system for detecting leakage in hydrocarbon valves, and a test system and method for simulating internal leakage of valves are disclosed. Through the control of valve opening of the valve in different leakage state by differential pressure transmitter, flow sensor and acoustic emission probe signal transmitted by each data acquisition data acquisition software corresponding to the back end. And in a large amount of data on the basis of the formation of a set of discriminant software, in the field of offline testing, you can call the corresponding information in the database to determine whether the internal leakage of the valve, as well as the size of the leakage.

       However, the technology used to weight metering valve leakage flow meter, flow meter and narrow valve size, internal leakage amount vary greatly, different valves need to use different flowmeter measurement range, high cost, and the corresponding difference between the flowmeter, to ensure reliable data. In addition, petrochemical production equipment, in addition to a small number of open pipeline pressure as the atmosphere, most of the valve is pressure test valve back pressure of the above technique is realized by collecting cans, not free to set up, so it is difficult to meet the multi condition simulation of petrochemical production. The existing test uses rigid pipeline to connect each component, and is difficult to apply to different standards or different pressure levels or different types of petrochemical valves, and the analog valve categories are greatly restricted.

Invention background

       According to the technical problems existing in the prior art, the invention provides a simulation test device for gas leakage within the valve and test methods, reasonable design, overcomes the defects of the existing technology by measuring range flowmeter, wide application range, simple operation, saving cost, has a good effect.

       In order to achieve the purpose, the invention adopts the following technical scheme: a test device for simulating gas leakage within the valve, including the main line, pipeline, pressure instrument signal and control signal lines, including air compressor, air storage tank, a buffer tank, a pilot valve group, differential pressure meter, reference tank, thermometer, air compressor the control system, the first pressure regulating valve, pressure regulating valve, the first second valves, second valves, third valves, second first instrument valves, instrument valves, instrument valves third and sixth "8" type blind plate, the air compressor, a gas storage tank, a first valve, the pressure regulating valve and a buffer tank, valve, second the test group, second valve pressure regulating valve, valve third and sixth "8" type blind plate are connected through the main line, the gas tank, the first instrument valves, reference tank, second meter The valve, the differential pressure gauge and the third meter valve are connected in sequence by an instrument pipe line, wherein the thermometer is arranged above the air storage tank, and the air compressor and the air compressor control system are connected by a control signal line.

       Preferably, the air compressor control system and the gas storage tank are connected by a pressure signal line. The first regulating valve is connected with one side of the test valve set through the pressure signal line and the side of the test valve group, namely the second valve. The second pressure regulating valve is connected with one side of the test valve set through a pressure signal line and one side of the test valve group, namely the second regulating valve. The test valve group comprises a first test line, second test line and third test line, the first test line sink and second test line, the first test line are orderly arranged on the first "8" type blind plate, the first bellows and the first test valve, the second test line is provided with second "8 - blind, second and second bellows valve test, the third test line is provided with third" 8 "type blind plate, third and third bellows valve test, the first test line of the first test line sink settingsadministratorapplication line between the second valve and test valve group and close to the first" 8 "type blind plate connected at the end of second, the test line setting the main line between the valve and the valve pressure test group in second and the first test of the valve near one end of the first test Pipeline connection.

       Preferably, the third first test assembly line is provided with a fourth "8" type blind plate, the first test line connecting the first test pipeline, the second test pipeline and one end of the test pipeline. A fifth "8" type blind plate is arranged on the second test collecting line, and the second test line connects the first test pipeline, the second test pipeline and the other end of the third test pipeline. The main line in the nominal diameter of DN50 ~ DN100 range, the first test and second test wire diameter wire diameter is the main line of the nominal diameter of 3 to 5 times, the first test line, second test line and third test pipeline diameter is the main line of the nominal diameter of 0.5 to 3 times, the first second corrugated pipe, corrugated pipe and corrugated pipe third connected with the maximum expansion range of not less than the test pipeline diameter 1/2.

       The invention has the advantages brought by the invention: the simulation of leakage within the valve, by regulating downstream pressure control pilot valve, the valve can be simulated actual condition of petrochemical production process, the reliability of test data will be greatly improved, through the test data analysis experience algorithm form can be directly used for the diagnosis of similar leakage condition under the condition of the valve; with the help of differential pressure measuring principle to improve the ability of small leakage simulation device, overcomes the defects of the existing technology by the flowmeter measurement range limit, greatly expanding the valve category and size, has wide application range, simple operation and save test cost etc..

       The invention provides a simulation test device for gas leakage within the valve and test methods, compared with the prior art, the invention has the following advantages: according to the simulation of petrochemical production leakage within the valve, can adjust the test duration, the reference tank and the gas tank pressure measuring instrument in measuring range, feasibility test strong, overcomes the need to switch the meter operating complexity and the limitation of the narrow scope of testing; test the valve in the invention on the downstream pressure can be set arbitrarily in a certain range, can the actual condition of full coverage of seamless simulation, reliability simulation data on-line diagnosis of valve leakage by the invention has the higher than the existing technology; the blind test branch will test the valve valve in each group are separated from each other, each test valve itself may inhibit the strict and mutual interference The test pipe of the invention adopts a corrugated pipe to fit in the leakage test of valves of different standards or pressure levels, and expands the fan of analog valves (according to the instrument net)