CN115655599A - Hydrogen-doped connection sealing element leakage detection and fatigue integrated experimental device and method - Google Patents
Hydrogen-doped connection sealing element leakage detection and fatigue integrated experimental device and method Download PDFInfo
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Abstract
The invention provides a leakage detection and fatigue integrated experimental device and a method for a hydrogen-doped connecting sealing element, which comprises the following steps: the device comprises a sealing module and a detection module; the sealing module comprises a hydrogen-doped gas cylinder, a high-pressure pump and a high-low temperature box which are sequentially connected, a tested piece is arranged in the high-low temperature box, one end of the high-low temperature box is connected with the detection module, and a fatigue test based on pressure cyclic change in a hydrogen-doped pipeline is simulated by circularly setting the pressure of the high-pressure pump; the detection module comprises a drainage method detection unit, a differential pressure method detection unit and a concentration method detection unit, the detection module is used for obtaining leakage detection data, two functions of seal assembly leakage detection and fatigue performance experiments can be achieved, and the seal assembly tightness can be improved through experimental research.
Description
Technical Field
The invention belongs to the technical field of sealing element detection, and particularly relates to a leakage detection and fatigue integrated experimental device and method for a hydrogen-doped connection sealing element.
Background
At present, energy conservation and emission reduction are carried out in all countries, and wind and light renewable energy sources are vigorously developed. The hydrogen is a zero-emission secondary energy, has the advantages of various sources, cleanness, environmental protection, storage, regeneration and the like, is praised as an important clean energy in the 21 st century, and is widely concerned and supported by various countries. The long distance transport of hydrogen is a crucial step. Compared with modes such as a higher-pressure gas cylinder, a liquid hydrogen tank truck and the like, long-distance large-scale transportation of hydrogen can be realized more easily by using an in-service natural gas pipeline, so that the mode of mixing hydrogen into the natural gas pipeline for transportation is the best mode at present.
At present, the development of the natural gas pipeline transportation industry for hydrogen doping at home and abroad is still in the primary stage, and although a plurality of related researches and projects are developed, the natural gas pipeline transportation industry still faces a plurality of problems to be solved and perfected.
In the process of long-distance hydrogen-doped natural gas transportation, the flange plays a key role in realizing the connection between pipelines. The good sealing performance and safety of the flange can be improved by installing the rubber sealing ring or the sealing gasket in the flange, but the rubber elastomer also adds certain complexity to the related research on the influence of hydrogen on the pipeline material, and compared with the leakage performance of various typical plastic pipeline materials and related elastomers on hydrogen and methane, the leakage coefficient of hydrogen in most of elastomers such as rubber for manufacturing sealing elements is found to be much higher than that in the pipeline material, and the leakage is more likely to occur at the position. Therefore, the improvement of the sealing performance of the rubber sealing element has important significance for the safe transportation of the hydrogen-doped natural gas pipeline.
The existing methods for detecting the air tightness include a wet detection method, a direct pressure measurement method, a chemical gas tracing method, an ultrasonic detection method and the like. The wet-type detection method is low in detection cost, only needs a plugging tool, does not need specific detection equipment, can position leakage points, and has the following great defects: manual detection is adopted, the test observation period is long, the detection quality is influenced by manual factors, misjudgment is easily caused, and meanwhile, the detection time is long, and automation cannot be realized; the direct-pressing method is intuitive in test, but the biggest defect of the direct-pressing method is that the test precision is too low, and the high-precision test cannot be realized. Such a test method; the chemical gas tracer method has the highest detection sensitivity and is safe and nontoxic, but the method has high detection cost, high requirements on an automatic tool and long test time; the ultrasonic detection method has low efficiency and long period, and is mainly used for detecting the air tightness of single-piece or small-batch welded large-scale products.
At present, the conveying of the hydrogen-doped natural gas is in a primary stage, the micro-leakage air tightness detection means of the flange sealing assembly is single, the detection precision and efficiency cannot be effectively improved, the detection period is long, the precision reliability is low, and effective test analysis cannot be carried out on the quantitative influence of the hydrogen doping ratio, the working pressure, the environmental temperature, the bolt pretightening force, the sizes of the flange and the rubber sealing element and the type of the rubber sealing material on the leakage amount of the sealing assembly; meanwhile, the fatigue mechanical property of the rubber sealing material under the actual hydrogen-loading working condition is also lack of test equipment, and the problem is a difficult problem which needs to be solved urgently in the safe transportation of the pipeline.
Disclosure of Invention
In order to solve the problems, the invention provides a device and a method for detecting leakage and fatigue test of a sealing connecting piece based on micro-leakage air tightness detection and high-precision requirements and combined with the actual working condition of pressure cyclic change under the conveying of a hydrogen-doped/pure hydrogen pipeline.
According to some embodiments, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a hydrogen-doped joint seal leakage detection and fatigue integrated experimental apparatus, comprising: the device comprises a sealing module and a detection module;
the sealing module comprises a hydrogen-loading gas cylinder, a high-pressure pump and a high-low temperature box which are sequentially connected, a tested piece is arranged in the high-low temperature box, one end of the high-low temperature box is connected with a detection module, and a fatigue test based on pressure cyclic change in a hydrogen-loading pipeline is simulated by circularly setting the pressure of the high-pressure pump;
the detection module comprises a drainage method detection unit, the drainage method detection unit comprises a leakage detection pipe and a measuring cup, gas leaked by the detected piece enters the measuring cup through the leakage detection pipe, and leakage detection data are obtained by recording the variation of the water level in the measuring cup.
Furthermore, a first pressure gauge and a first automatic stop valve are connected between the gas cylinder and the high-pressure pump.
Furthermore, a second automatic stop valve, a pipeline check valve, a second pressure gauge and a first pressure sensor which are sequentially distributed are directly installed on the high-pressure pump and the high-low temperature tank.
Furthermore, the pipeline between the pipeline one-way valve and the first pressure sensor is also connected with the input end of the manual pressure release valve and the input end of the automatic pressure release valve, and the output end of the manual pressure release valve and the output end of the automatic pressure release valve are connected to the input port of the hydrogen-doped gas cylinder.
Furthermore, the detection module also comprises a pressure difference method detection unit, wherein the pressure difference method detection unit comprises a second stop valve, a vacuum pressure reducing valve and a pneumatic vacuum generator, a detected piece is clamped in the middle of the high-low pressure cavity, the air source of the high-pressure cavity is hydrogen-doped natural gas, the pressure of the low-pressure cavity is reduced to be vacuum by the vacuum pneumatic generator, high-low pressure difference is formed, and pressure change in the low-pressure cavity is collected in real time through a micro-pressure sensor to obtain leakage detection data.
Furthermore, the detection module further comprises a concentration method detection unit, the concentration method detection unit comprises a third stop valve, a palladium membrane concentration sensor and a leakage detection pipe, the palladium membrane concentration sensor is used for detecting, gas leaked by the detected piece enters the leakage detection pipe through the through hole, the gas concentration in the leakage detection pipe is measured through the palladium membrane concentration sensor, and data in the concentration sensor are collected to obtain leakage detection data.
Furthermore, the sealing module also comprises a valve pneumatic energy supply unit, and the valve pneumatic energy supply unit comprises a pre-aeration inlet, an air diad, a pressure reducing valve, an air pressure gauge and a control valve which are sequentially arranged, and provides power for a second automatic control valve, a manual pressure relief valve and a vacuum pneumatic generator.
Furthermore, the number of the control valves is two, namely a first control valve and a second control valve, the first control valve is communicated with the second automatic control valve, and the second control valve is connected with the manual pressure relief valve.
Furthermore, the drainage detection unit also comprises a first stop valve and a camera, wherein the first stop valve is arranged on a pipeline between the detection pipe and the measuring cup, a lens of the camera is opposite to the measuring cup, the variation of the water level in the measuring cup is recorded through the camera, and the data are transmitted to the processor.
In a second aspect, the invention provides a working method of a leakage detection and fatigue integrated experimental device for a hydrogen-doped connection sealing element, which comprises the following steps:
selecting a proper hydrogen loading proportion according to experimental requirements, displaying the pressure of the gas in the hydrogen loading gas cylinder in real time through a first pressure gauge, and then boosting the pressure to a specified pressure through a high-pressure pump;
the hydrogen-doped gas boosted by the high-pressure pump flows through the automatic stop valve, the pipeline one-way valve, the pressure gauge and the pressure sensor and is filled into a flange sealing tested piece, and the tested piece is placed in the high-temperature and low-temperature box;
aiming at hydrogen, a drainage method detection unit, a pressure difference method detection unit and a concentration method detection unit are adopted for detection, detected data are transmitted to a processor in real time, and a volume-time curve, a pressure-time curve and a concentration-time curve are drawn;
and when the experiment is finished, the hydrogen-doped gas in the pipeline can be released by adopting a manual pressure release valve and an automatic pressure release valve, and the released gas can return to the hydrogen-doped gas cylinder.
Compared with the prior art, the invention has the beneficial effects that:
1. the sealing module comprises a hydrogen-doped gas cylinder, a high-pressure pump and a high-low temperature box which are sequentially connected, a tested piece is arranged in the high-low temperature box, one end of the high-low temperature box is connected with a detection module, and the fatigue test based on pressure cycle change in a hydrogen-doped pipeline is simulated by setting the pressure of the high-pressure pump in a cycle manner; the detection module can be used for obtaining leakage detection data, and a set of processes can realize multifunctional experiments; firstly, a multi-factor coupling leakage detection experiment can be carried out; and secondly, a fatigue test under multi-factor coupling can be carried out, the high-pressure pump is an electric booster pump, a piston in the pump can circularly move for 30 times in 1 minute, and the pressure maintaining time can be set, so that the pressure of the high-pressure pump can be circularly set, a fatigue test based on pressure cyclic change in a hydrogen loading pipeline can be simulated, two functions of leakage detection and fatigue performance test of a sealing component can be realized, the sealing property of the sealing component can be improved through experimental research, and the problem of safe hydrogen loading/pure hydrogen conveying can be solved.
2. The invention can carry out the comparison of the detection precision of leakage, provides the method for carrying out the leakage measurement by adopting the palladium film concentration sensor, the palladium film concentration sensor has high specificity to hydrogen, is not interfered by other gases, does not need oxygen in the measurement process, has long service life, and can carry out the precision comparison by contrasting three detection technologies of concentration method detection, drainage method and differential pressure method, thereby providing a high-precision detection mode for the later micro-leakage detection.
3. The invention can explore the influence rule of multi-factors on the sealing of the hydrogen-doped/pure hydrogen pipeline; the device can not only study the quantitative influence of various factors such as the hydrogen doping ratio, the working pressure, the ambient temperature, the bolt pretightening force, the sizes of the flange and the rubber sealing element, the type of the rubber sealing material and the like on the leakage rate of the sealing assembly, but also carry out a fatigue test caused by long-term alternating cyclic stress, study the influence rule of the fatigue working condition of the rubber sealing element on the leakage rate of the sealing element and further optimize the sealing process parameters.
4. The experimental device adopted by the invention has no welding connection, adopts threaded connection, is convenient to disassemble, has high safety factor, long service life and is convenient to maintain.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without limiting the invention to the proper forms disclosed herein.
FIG. 1 is a schematic structural diagram of a joint seal leakage detection and fatigue testing apparatus according to a first embodiment;
FIG. 2 is a schematic diagram illustrating the detection principle of a concentration detection unit according to the first embodiment;
FIG. 3 is a schematic view illustrating a detection principle of the differential pressure detection unit according to the first embodiment;
FIG. 4 is a schematic view of the detection principle of the drainage detection unit according to the first embodiment;
wherein: 1. a sealing module; 2. a detection module; 101. a hydrogen-loaded gas cylinder; 102. a first pressure gauge; 103. a first automatic stop valve; 104. a high pressure pump; 105. an automatic controller; 106. A second automatic stop valve; 107. a pipeline check valve; 108. a second pressure gauge; 109. a first pressure sensor; 110. a digital display meter; 111. a high and low temperature chamber; 112. a flange seal; 113. A manual pressure relief valve; 114. an automatic pressure relief valve; 115. a pre-aeration inlet; 116. air diad; 117. a pressure reducing valve; 118. an air pressure gauge; 119. a first control valve; 120. A second control valve; 201. a second stop valve; 202. a first shut-off valve; 203. a second pressure sensor; 204. a vacuum relief valve; 205. a pneumatic vacuum generator; 206. a measuring cup; 207. a camera; 208. a third stop valve; 209. a palladium membrane concentration sensor; 210. a computer.
The specific implementation mode is as follows:
the invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of the features, steps, operations, devices, components, and/or combinations thereof.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides an integrated experimental apparatus for leak detection and fatigue of a hydrogen-loaded connection seal, comprising: a sealing module 1 and a detection module 2;
the sealing module 1 comprises five parts, namely an air supply system, a control system, a pressure relief system, a valve pneumatic energy supply system and a tested part, and comprises a stainless steel gas cylinder, a first pressure gauge 102, a first automatic stop valve 103, a high-pressure pump 104, a second automatic stop valve 106, a pipeline check valve 107, a second pressure gauge 108, a first pressure sensor 109 and a flange sealing part 112 which are sequentially connected, the tested part is installed in the flange sealing part 112, and one end of the flange sealing part 112 is connected with the detection module 2.
The pipeline between the pipeline check valve 107 and the first pressure sensor 109 is also connected with the input end of a manual pressure relief valve 113 and the input end of an automatic pressure relief valve 114, and the output end of the manual pressure relief valve 113 and the output end of the automatic pressure relief valve 114 are connected to the input port of the stainless steel gas cylinder.
The sealing module 1 further comprises a valve pneumatic energy supply unit, the valve pneumatic energy supply unit comprises a pre-aeration inlet 115, an air doublet 116, a pressure reducing valve 117, an air pressure gauge 118 and two control valves, the pre-aeration inlet, the air doublet 116, the pressure reducing valve 117, the air pressure gauge 118 and the control valves are sequentially arranged, the two control valves are respectively a first control valve 119 and a second control valve 120, the first control valve 119 is communicated with the second automatic control valve, the second control valve 120 is connected with a manual pressure relief valve 113, and the air pressure gauge 118 is also communicated with a pneumatic vacuum generator 205 besides the first control valve 119 and the second control valve 120 to provide aerodynamic force for the pneumatic vacuum generator.
The detection module 2 includes a drainage method detection system, a pressure difference method detection system, a concentration method detection system, and a computer 210 for collecting data, and the following describes the constituent instruments of each part.
The drainage method detection unit comprises a leakage detection pipe, a first stop valve 202, a measuring cup 206 and a camera 207, wherein when the drainage method is adopted for detection, gas leaked from a detected piece flows into the measuring cup 206 through the detection pipe through a through hole, the variable quantity of the water level in the measuring cup 206 is recorded through the high-precision camera 207, the rising volume of the liquid level is the volume of the leaked gas, data in the camera 207 is transmitted to a computer 210 in real time, and a volume-time curve is drawn;
the pressure difference method detection unit comprises a second stop valve 201, a second pressure sensor 203, a vacuum pressure reducing valve 204 and a pneumatic vacuum generator 205, when the pressure difference method is adopted for detection, a detected piece is clamped in the middle of a high-pressure cavity and a low-pressure cavity, the air source of the high-pressure cavity is hydrogen-doped natural gas, the pressure of the low-pressure cavity is reduced to be vacuum by the vacuum pneumatic generator, high-low pressure difference is formed, pressure change in the low-pressure cavity is transmitted to a computer 210 in real time through a micro-pressure sensor, and a pressure-time curve is drawn. The pneumatic vacuum generator 205 is also connected to a valve pneumatic energy supply unit of the sealing module 1, with which valve pneumatic energy supply unit the pneumatic vacuum generator 205 is also provided with an energy drive.
The concentration method detection unit comprises a third stop valve 208 and a palladium membrane concentration sensor 209, the palladium membrane concentration sensor 209 is adopted for detection, gas leaked by a detected piece enters the leakage detection pipe through the through hole, the gas concentration in the leakage detection pipe is measured through the palladium membrane concentration sensor 209, and data in the concentration sensor is transmitted to a computer 210 to draw a concentration-time curve.
(1) The gas supply unit consists of a stainless steel gas cylinder, a first pressure gauge 102 and a first automatic stop valve 103, a proper hydrogen loading proportion is selected according to experiment requirements, the pressure of gas in the hydrogen loading gas cylinder 101 is displayed in real time through the first pressure gauge 102, and then the pressure is increased to a specified pressure through a high-pressure pump 104;
(2) The control unit consists of a high-pressure pump 104, a second automatic stop valve 106, a pipeline check valve 107, a first pressure sensor 109, a digital display meter 110 and a flange sealing piece 112, the hydrogen-loaded gas boosted by the high-pressure pump 104 flows through the automatic stop valve, the pipeline check valve 107, the pressure meter and the pressure sensor and is filled in the flange sealing piece to be measured, and the piece to be measured is placed in the flange sealing piece 112 in order to change the environmental temperature;
(3) The pressure relief unit consists of a second pressure gauge 108, a manual pressure relief valve 113 and an automatic pressure relief valve 114, the hydrogen-loaded gas in the pipeline can be released by the manual pressure relief valve 113 and the automatic pressure relief valve 114 after the experiment is finished, and the released gas can return to the hydrogen-loaded gas cylinder 101.
(4) The valve pneumatic energy supply unit consists of an air diad 116, a pressure reducing valve 117, an air pressure gauge 118 and a control valve; the experimental device is in the hydrogen-loading working condition, and in order to ensure safety, the valve through which the hydrogen flows is switched on and off by taking an air source as power. Valve pneumatic energy supply process: air enters from a prefabricated air inlet to be compressed, in order to prolong the service life of the equipment, the compressed air is filtered by other impurities through the air diad 116 to purify the air, the purified compressed air is reduced in pressure through the pressure reducing valve 117, the pressure of the air is displayed in real time through the pressure gauge, the air pressure gauge 118 is connected with two control valves and the pneumatic vacuum generator 205, the air flowing through the control valves enters the automatic stop valve and the pressure relief valve, and power is provided for the valves and the pneumatic vacuum generator 205.
(5) If the drainage method is adopted for detection, gas leaked from a detected piece flows through the detection pipe through a leakage hole (through hole) and enters the measuring cup 206, the variable quantity of the water level in the measuring cup 206 is recorded through the high-precision camera 207, the rising volume of the liquid level is the volume of the leaked gas, data in the camera 207 is transmitted to the computer 210 in real time, and a volume-time curve is drawn.
(6) The differential pressure method detection unit is composed of a second stop valve 201, a second pressure sensor 203, a vacuum reducing valve 204 and a pneumatic vacuum generator 205; if the pressure difference method is adopted for detection, the detected piece is clamped in the middle of the high-pressure cavity and the low-pressure cavity, the high-pressure cavity is filled with the hydrogen natural gas, the vacuum generator is adopted to reduce the pressure of the low-pressure cavity to vacuum, high-low pressure difference is formed, the pressure change in the low-pressure cavity is transmitted to the computer 210 in real time through the micro-pressure sensor, and a pressure-time curve is drawn.
(7) The concentration method detection unit consists of a third stop valve 208 and a palladium membrane concentration sensor 209, the palladium membrane concentration sensor 209 is adopted for detection, gas leaked by a detected piece enters the leakage detection pipe through the through hole, the gas concentration in the leakage detection pipe is measured through the palladium membrane concentration sensor 209, and data in the concentration sensor is transmitted to a computer 210 to draw a concentration-time curve.
Example two:
the embodiment provides a working method of a leakage detection and fatigue integrated experimental device for a hydrogen-doped connection sealing element, which comprises the following steps:
(1) the appropriate hydrogen loading proportion is selected according to experimental requirements, the pressure of the gas in the hydrogen loading gas cylinder 101 is displayed in real time through a first pressure gauge 102, and then the pressure is increased to the specified pressure through a high-pressure pump 104.
(2) The hydrogen-loaded gas pressurized by the high-pressure pump 104 flows through the automatic shutoff valve, the line check valve 107, the pressure gauge, and the pressure sensor to be filled in the flange seal member 112, and the member to be measured is placed in order to change the ambient temperature.
(3) For hydrogen, a palladium membrane concentration sensor 209 is adopted for detection, gas leaked by a detected piece enters a leakage detection pipe through a through hole, the gas concentration in the leakage detection pipe is measured through the palladium membrane concentration sensor 209, and data in the concentration sensor is transmitted to a computer 210 to draw a concentration-time curve; if a differential pressure method is adopted for detection, a detected piece is clamped in the middle of a high-pressure cavity and a low-pressure cavity, the high-pressure cavity is filled with hydrogen natural gas, the pressure of the low-pressure cavity is reduced to be vacuum by a vacuum pneumatic generator to form high-low differential pressure, the pressure change in the low-pressure cavity is transmitted to a computer 210 in real time through a micro-pressure sensor, and a pressure-time curve is drawn; if the drainage method is adopted for detection, gas leaked from a detected piece flows through the through hole and the detection pipe to enter the measuring cup 206, the variation of the water level in the measuring cup 206 is recorded through the high-precision camera 207, the volume of the rising liquid level is the volume of the leaked gas, data in the camera 207 is transmitted to the computer 210 in real time, and a volume-time curve is drawn.
(4) The experimental device is in the hydrogen-loading working condition, and in order to ensure safety, the valve through which the hydrogen flows is switched on and off by taking an air source as power. Valve pneumatic energy supply flow: the air enters from the prefabricated air inlet to be compressed, in order to prolong the service life of the equipment, the compressed air filters other impurities through the air duplex body 116 to purify the air, the purified compressed air reduces the pressure through the pressure reducing valve 117, the pressure gauge displays the air pressure in real time, the air pressure gauge 118 is connected with two control valves and the pneumatic vacuum generator 205, the air flowing through the control valves enters into the automatic stop valve and the pressure relief valve to provide power for the valves and the switch of the pneumatic vacuum generator 205.
(5) The hydrogen-loaded gas in the pipeline at the end of the experiment can be discharged by using a manual pressure release valve 113 and an automatic pressure release valve 114, and the discharged gas can be returned to the hydrogen-loaded gas cylinder 101.
The high pressure pump 104, the pneumatic vacuum generator 205 and the digital display meter 110 in this embodiment are all automatically controlled by the automatic controller 105, and the automatic controller 105 may be plc, and may be programmed in advance to realize automatic control, which is convenient for operation and data recording.
(1) One set of flow in this design can realize multi-functional experiment. Firstly, the multi-factor coupling leakage detection experiment can be carried out. And secondly, a fatigue test under multi-factor coupling can be carried out, in the design, the high-pressure pump 104 is an electric booster pump, a piston in the pump can circularly move for 30 times in 1 minute, and the pressure maintaining time can be set, so that the pressure of the high-pressure pump 104 can be circularly set, and the fatigue test based on pressure cyclic change in a hydrogen-doped pipeline can be simulated.
(2) The design can be used for comparing the leakage detection precision. The leakage measurement is carried out by adopting the palladium membrane concentration sensor 209, the palladium membrane concentration sensor 209 has high specificity to hydrogen, is not interfered by other gases, does not need oxygen in the measurement process, has long service life, and can carry out precision comparison by comparing three detection technologies of concentration method detection, drainage method and pressure difference method, thereby providing a high-precision detection mode for the later micro-leakage detection.
(3) The design can explore the influence rule of multiple factors on the sealing of the hydrogen-doped/pure hydrogen pipeline. The device can not only study the quantitative influence of various factors such as the hydrogen doping ratio, the working pressure, the environmental temperature, the bolt pretightening force, the sizes of the flange and the rubber sealing element, the type of the rubber sealing material and the like on the leakage amount of the sealing assembly, but also carry out a fatigue test caused by long-term alternating cyclic stress, study the influence rule of the fatigue working condition of the rubber sealing element on the leakage amount of the sealing element and further optimize the parameters of the sealing process.
One set of device can realize two functions of seal assembly leakage detection and fatigue performance experiment, can improve seal assembly leakproofness through experimental study, can solve the difficult problem for hydrogen loading/pure hydrogen safety transport. The experimental device has no welding connection, adopts threaded connection, is convenient to disassemble, has high safety coefficient, long service life and is convenient to maintain.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (10)
1. Mix hydrogen and connect sealing member leak testing and tired integration experimental apparatus, its characterized in that includes: the device comprises a sealing module and a detection module;
the sealing module comprises a hydrogen-loading gas cylinder, a high-pressure pump and a high-low temperature box which are sequentially connected, a tested piece is arranged in the high-low temperature box, one end of the high-low temperature box is connected with a detection module, and a fatigue test based on pressure cyclic change in a hydrogen-loading pipeline is simulated by circularly setting the pressure of the high-pressure pump;
the detection module comprises a drainage detection unit, the drainage detection unit comprises a leakage detection pipe and a measuring cup, gas leaked by the detected piece enters the measuring cup through the leakage detection pipe, and leakage detection data are obtained by recording the variation of the water level in the measuring cup.
2. The integrated testing device for leak detection and fatigue of hydrogen-loading connecting sealing member of claim 1, wherein a first pressure gauge and a first automatic stop valve are connected between the gas cylinder and the high-pressure pump.
3. The integrated experimental apparatus for leak detection and fatigue test of hydrogen-loaded connecting seal member as claimed in claim 1, wherein said high-pressure pump and high-low temperature tank are directly equipped with a second automatic stop valve, a pipeline check valve, a second pressure gauge and a first pressure sensor which are sequentially arranged.
4. The integrated experimental device for leak detection and fatigue of the hydrogen-loading connection sealing element as claimed in claim 3, wherein the pipeline between the pipeline one-way valve and the first pressure sensor is further connected with the input end of the manual pressure release valve and the input end of the automatic pressure release valve, and the output end of the manual pressure release valve and the output end of the automatic pressure release valve are connected to the input port of the hydrogen-loading gas cylinder.
5. The integrated experimental device for leak detection and fatigue of the hydrogen-doped connection sealing element according to claim 1, wherein the detection module further comprises a pressure difference method detection unit, the pressure difference method detection unit comprises a second stop valve, a vacuum pressure reducing valve and a pneumatic vacuum generator, the detected element is clamped in the middle of the high-pressure cavity and the low-pressure cavity, the air source of the high-pressure cavity is doped with hydrogen natural gas, the pressure of the low-pressure cavity is reduced to vacuum by the vacuum pneumatic generator to form high-low pressure difference, and pressure change in the low-pressure cavity is collected in real time through a micro-pressure sensor to obtain leak detection data.
6. The integrated experimental device for leak detection and fatigue of hydrogen-loaded connecting sealing element according to claim 1, wherein the detection module further comprises a concentration method detection unit, the concentration method detection unit comprises a third stop valve, a palladium membrane concentration sensor and a leakage detection pipe, the palladium membrane concentration sensor is adopted for detection, gas leaked from the tested element enters the leakage detection pipe through the through hole, the palladium membrane concentration sensor is used for measuring the gas concentration in the leakage detection pipe, and the data in the concentration sensor is collected to obtain the leak detection data.
7. The integrated experimental apparatus for leak detection and fatigue test of hydrogen loading connection sealing element according to claim 1, wherein the sealing module further comprises a valve pneumatic energy supply unit, and the valve pneumatic energy supply unit comprises a pre-aeration inlet, an air diad, a pressure reducing valve, an air pressure gauge and a control valve which are sequentially arranged.
8. The integrated experimental device for leak detection and fatigue test of the hydrogen-loading connection sealing element according to claim 7, wherein two control valves are provided, namely a first control valve and a second control valve, the first control valve is communicated with the second automatic control valve, and the second control valve is connected with the manual pressure relief valve.
9. The integrated testing device for leak detection and fatigue of hydrogen loading connection sealing member of claim 1, wherein the water discharge method detection unit further comprises a first stop valve and a camera, the first stop valve is arranged on the pipeline between the detection pipe and the measuring cup, the lens of the camera faces the measuring cup, the change of the water level in the measuring cup is recorded by the camera, and the data is transmitted to the processor.
10. The working method of the hydrogen-doped connection sealing element leakage detection and fatigue integrated experimental device is characterized by comprising the following steps of:
selecting a proper hydrogen loading proportion according to experimental requirements, displaying the pressure of the gas in the hydrogen loading gas cylinder in real time through a first pressure gauge, and then boosting the pressure to a specified pressure through a high-pressure pump;
the hydrogen-doped gas boosted by the high-pressure pump flows through the automatic stop valve, the pipeline one-way valve, the pressure gauge and the pressure sensor and is filled into a flange sealing tested piece, and the tested piece is placed in the high-temperature and low-temperature box;
aiming at hydrogen, a drainage method detection unit, a pressure difference method detection unit and a concentration method detection unit are adopted for detection, detected data are transmitted to a processor in real time, and a volume-time curve is drawn;
and (4) discharging the hydrogen-loaded gas in the pipeline by adopting a manual pressure release valve and an automatic pressure release valve after the experiment is finished, and returning the discharged gas to the hydrogen-loaded gas cylinder.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117169088A (en) * | 2023-11-03 | 2023-12-05 | 大连理工大学 | High-pressure hydrogen permeation continuous monitoring device and testing method thereof |
| WO2024124860A1 (en) * | 2022-12-14 | 2024-06-20 | 中国石油大学(华东) | Experimental device for measuring leakage rate of connecting member and sealing member of hydrogen-blended pipeline, and method |
-
2022
- 2022-10-31 CN CN202211345747.1A patent/CN115655599A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024124860A1 (en) * | 2022-12-14 | 2024-06-20 | 中国石油大学(华东) | Experimental device for measuring leakage rate of connecting member and sealing member of hydrogen-blended pipeline, and method |
| CN117169088A (en) * | 2023-11-03 | 2023-12-05 | 大连理工大学 | High-pressure hydrogen permeation continuous monitoring device and testing method thereof |
| CN117169088B (en) * | 2023-11-03 | 2024-01-09 | 大连理工大学 | High-pressure hydrogen permeation continuous monitoring device and testing method thereof |
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