CN217032924U - Utilize airtight test system of diaphragm compressor - Google Patents
Utilize airtight test system of diaphragm compressor Download PDFInfo
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- CN217032924U CN217032924U CN202123030016.1U CN202123030016U CN217032924U CN 217032924 U CN217032924 U CN 217032924U CN 202123030016 U CN202123030016 U CN 202123030016U CN 217032924 U CN217032924 U CN 217032924U
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Abstract
The application provides an utilize airtight test system of diaphragm compressor, including the comiculation in the hydrogen pipeline and the nitrogen gas pipeline of diaphragm compressor import side, diaphragm compressor's gas vent is connected with and fills the filler pipe way, it is used for filling the filler pipe way and fills the dress to hydrogen, it has the test pipeline still to communicate on the filler pipe way, the test pipeline is used for connecting hydrogen plant and carries out the gas tightness in order to fill the nitrogen to hydrogen plant and detect, utilizes the characteristics of the diaphragm compressor pressure boost that has now in the station, fills the nitrogen through the external nitrogen pipeline to diaphragm compressor, and the gas vent of diaphragm compressor passes through the test tube and connects hydrogen plant, carries out nitrogen gas to hydrogen plant and fills dress and carry out the gas tightness test, for production plant provides the air supply that accords with pressure, has solved hydrogen plant maintenance, has examined the air supply pressure problem of the gas tightness test after the maintenance.
Description
Technical Field
The application relates to the technical field of electrolytic hydrogen production, in particular to an airtight testing system utilizing a diaphragm compressor.
Background
Renewable energy sources are used for generating electricity, hydrogen and oxygen are prepared by a water electrolysis hydrogen production device, the method is a main process production and operation mode of hydrogen production enterprises at present, and the working pressure of a conventional water electrolysis hydrogen production device is between 1.6MPa and 2.0 MPa; the working pressure of the hydrogen buffer tank is 16MPa-2.0 MPa; the working pressure of the filling system is 20MPa, regular maintenance, maintenance and inspection and repair are required to be carried out on the equipment after the equipment operates for a certain period to ensure the safe and stable operation of the equipment, and after the maintenance, the inspection and repair are finished, a safety medium (nitrogen) is adopted as a system to carry out an air tightness test, so that gas leakage of pressure containers, pipelines, valve connectors and the like in the operation process is prevented, and accident disasters are prevented. However, the working pressure of nitrogen prepared or purchased from a factory at present is about 0.8MPa, so that the requirement of the gas tightness test pressure of the hydrogen production device cannot be met, and the gas tightness test cannot be carried out on the hydrogen production device.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the purpose of the application is to provide an airtight testing system utilizing a diaphragm compressor, the characteristic of pressurization of the existing diaphragm compressor in a plant station is utilized, nitrogen is filled through an external nitrogen pipeline of the diaphragm compressor, an exhaust port of the diaphragm compressor is connected with a hydrogen production device through a testing pipeline, the nitrogen filling is carried out on the hydrogen production device to carry out the airtight test, a gas source meeting the pressure is provided for a production device, and the problem of gas source pressure of the airtight test after the maintenance and the inspection of the hydrogen production device is solved.
In order to achieve the above object, the present application proposes a gas tightness test system using a diaphragm compressor, comprising a hydrogen line and a nitrogen line connected in common to an inlet side of the diaphragm compressor, the gas outlet of the diaphragm compressor is connected with a filling pipeline which is used for filling hydrogen, the charging pipeline is also communicated with a test pipeline, the test pipeline is used for connecting the hydrogen production device to detect the gas tightness of nitrogen charged in the hydrogen production device, the device also comprises a pressure regulating pipeline communicated with the test pipeline and the nitrogen pipeline, the air inlet and the air outlet of the diaphragm compressor are connected end to end through the nitrogen pipeline, the filling pipeline and the pressure regulating pipeline to form a self-circulation loop, and a first regulating valve is arranged on the pressure regulating pipeline, and the exhaust pressure of the diaphragm compressor is regulated through the opening control of the first regulating valve.
Furthermore, a first pressure sensor and a pressure gauge are arranged on the test pipeline.
Further, a first cut-off valve is arranged on the hydrogen pipeline, and a second cut-off valve is arranged on the nitrogen pipeline.
Furthermore, the test pipeline is connected with the hydrogen production device through a first branch pipeline.
Further, a second pressure sensor is arranged on the first branch pipeline.
Furthermore, a pressure reducing valve, a switch valve and a one-way valve are sequentially arranged on the first branch pipeline.
Further, still include the unloading pipeline, the one end of unloading pipeline connect in first branch pipeline, the spark arrester is connected to the other end of unloading pipeline.
Furthermore, the test pipeline is connected with a liquid oxygen device through a second branch pipeline, the test pipeline is connected with a hydrogen buffer tank through a third branch pipeline, and the test pipeline is communicated with a hydrogen filling device through a fourth pipeline.
Further, a third stop valve is arranged on the charging pipeline.
Additional aspects and advantages of the present application 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 present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a gas tightness testing system using a diaphragm compressor according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application. On the contrary, the embodiments of the application include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
Fig. 1 is a schematic structural diagram of a gas tightness testing system using a diaphragm compressor according to an embodiment of the present application.
Referring to fig. 1, a gas tightness test system using a diaphragm compressor includes a hydrogen gas line 2 and a nitrogen gas line 3 connected in common to an inlet side of the diaphragm compressor 1, the gas outlet of the diaphragm compressor 1 is connected with a filling pipeline 4, the filling pipeline 4 is used for filling hydrogen, the filling pipeline 4 is also communicated with a test pipeline 5, the test pipeline 5 is used for connecting a hydrogen production device 6 to detect the gas tightness of nitrogen filled in the hydrogen production device 6, and the filling device also comprises a pressure regulating pipeline 7 communicated with the test pipeline 5 and the nitrogen pipeline 3, the air inlet and the air outlet of the diaphragm compressor 1 are connected end to end through the nitrogen pipeline 3, the filling pipeline 4 and the pressure regulating pipeline 7 to form a self-circulation loop, the pressure regulating pipeline 7 is provided with a first regulating valve 8, and the exhaust pressure of the diaphragm compressor 1 is regulated through the opening control of the first regulating valve 8.
In the embodiment, the existing hydrogen filling system is used for modification, the air inlet of the diaphragm compressor is externally connected with a nitrogen pipeline, and the air outlet of the diaphragm compressor is connected into the hydrogen production device through a test pipeline, so that the air tightness test of the hydrogen production device is realized. And the air inlet and the exhaust port of the diaphragm compressor are connected end to form a self-circulation loop through the nitrogen pipeline 3, the filling pipeline 4 and the pressure regulating pipeline 7, the exhaust pressure of the diaphragm compressor is regulated through the opening adjustment of the first regulating valve on the pressure regulating pipeline, and the dynamic regulation is carried out, so that the pressure testing requirement of the hydrogen production device is met.
In this embodiment, the nitrogen pipeline and the hydrogen pipeline share the same pipeline and are communicated with the air inlet of the diaphragm compressor, and the pressure regulating pipeline is also connected to the shared pipeline.
In some embodiments, the gas inlet of the membrane compressor 1 is further connected to a hydrogen pipeline 2, the gas outlet of the membrane compressor 1 is further connected to a filling pipeline 4, the filling pipeline 4 is used for filling hydrogen, the hydrogen is pressurized by the membrane compressor 1 and then distributed through a filling pipeline filling pipe trailer, a third cut-off valve 9 is arranged on the filling pipeline 4, and the control of hydrogen filling is realized through opening and closing of the third cut-off valve 9. For example, when hydrogen gas filling is not required, the third shut-off valve is closed, the filling line is interrupted, and hydrogen gas filling is stopped.
In this embodiment, the hydrogen production apparatus is a conventional apparatus in the prior art, and includes an electrolytic cell, a gas-liquid separator, a gas cooler, and the like, which are connected in sequence through a pipeline, and the hydrogen production apparatus needs to be replaced with nitrogen gas when being shut down to ensure safety. This application is not described in detail herein.
And a first pressure sensor and a pressure gauge are arranged on the test pipeline 5. The pressure of the exhaust port of the diaphragm compressor can be monitored visually through the first pressure sensor and the pressure gauge, and timely adjustment is facilitated.
The hydrogen pipeline 2 is provided with a first cut-off valve 10, and the nitrogen pipeline 3 is provided with a second cut-off valve 11. The first cut-off valve 10 controls the on-off of the hydrogen pipeline, the second cut-off valve 11 controls the on-off of the nitrogen pipeline 3, and the introduction of nitrogen or hydrogen is controlled by opening and closing the first cut-off valve 10 and the second cut-off valve 11.
The test pipeline 5 is connected with the hydrogen production device 6 through a first branch pipeline 12. And the nitrogen enters the hydrogen production device through the test pipeline and the first branch pipeline to be filled with nitrogen, and then the pressure is maintained to carry out air tightness test.
A second pressure sensor is arranged on the first branch pipeline 12. The filling pressure of the hydrogen production device is further monitored through the second pressure sensor, and timely adjustment is facilitated.
The liquid oxygen device 14 is connected to the test pipeline 5 through the second branch pipeline 13, the hydrogen buffer tank 15 is connected to the test pipeline 5 through the third branch pipeline 21, and when the hydrogen pressure is high and the air flow speed is high, the hydrogen buffer tank is arranged for buffering, so that the test pipeline is prevented from being damaged.
The test pipeline 5 is communicated with a hydrogen filling device 23 through a fourth pipeline 16. The hydrogen filling device 23 can be a pump body, a pipeline, a tank body and other structures, and is convenient for filling hydrogen.
In this embodiment, hydrogen plant, liquid oxygen device and the hydrogen that the parallel arrangement filled the device and communicate each other, and liquid oxygen device and hydrogen fill the device and can store the oxygen and the hydrogen that hydrogen plant produced. Especially when the hydrogen production device is replaced by nitrogen, the hydrogen and oxygen in the hydrogen production device can be discharged in advance for storage. The liquid oxygen device and the hydrogen filling device can be tank structures.
The air tightness testing system utilizing the diaphragm compressor further comprises a vent pipeline 17, one end of the vent pipeline 17 is connected with the first branch pipeline 12, and the other end of the vent pipeline 17 is connected with a flame arrester 18. As another use of this application, utilize diaphragm compressor's pressure boost effect, this application can also carry out nitrogen gas for the device as the safety coefficient and sweep, and the emergence of accident has been eliminated, has been suppressed for the device is put out a fire to the nitrogen gas that the long-range transport accords with pressure, very big improvement the security of enterprise. It can be understood that the air inlet end of the vent line should also be provided with a valve for control, so as to facilitate the operation, which is not described herein in detail. The air inlet end of the emptying pipeline is provided with a plurality of inlets, so that the flame arrester can be flexibly selected to supply air.
The first branch pipeline 12 is further provided with a pressure reducing valve 19, a switch valve 20 and a one-way valve 22 in sequence, and the switch valve is controlled to be opened and closed by setting the pressure reducing valve 19 and the switch valve 20, wherein the set pressure of the pressure reducing valve is consistent with the rated working pressure of the hydrogen production device, so that overpressure of the test pipeline is avoided.
An operation method of an air tightness testing system by using a diaphragm compressor is applied to the air tightness testing system by using the diaphragm compressor and comprises the following steps,
controlling the first cut-off valve 10 to be closed and the third cut-off valve 9 to be closed; the second cut-off valve 11 is opened, and the diaphragm compressor 1 starts a self-circulation mode; and under the self-circulation mode, the exhaust pressure of the diaphragm compressor 1 is adjusted to meet the pressure requirement of the system.
The opening degree of the first regulating valve 8 is regulated according to the pressure sensed by the first pressure sensor, and the exhaust pressure of the diaphragm compressor 1 is regulated and controlled according to the opening degree of the first regulating valve 8;
in this embodiment, the exhaust pressure of the diaphragm compressor can be obtained through the first pressure sensor, and then the opening of the first regulating valve is regulated, so as to achieve the purpose of controlling the exhaust pressure of the compressor.
When the exhaust pressure of the diaphragm compressor 1 reaches a set value and lasts for a preset time, the switch valve 20 is opened to supply nitrogen for the hydrogen production device 6;
when the pressure value monitored by the first pressure sensor is lower than the set pressure, the opening of the first regulating valve 8 is closed, the exhaust pressure of the diaphragm compressor is boosted, when the pressure value monitored by the first pressure sensor is higher than the set value, the opening of the first regulating valve 8 is increased, the backflow gas is increased, the exhaust pressure is decreased, and when the pressure of the first pressure sensor reaches the set value, the pressure is continuously stabilized for 5 minutes. In this embodiment, the pressure set value is 1.6MPa of the rated operating pressure of the hydrogen production apparatus.
Monitoring the filling pressure of the hydrogen production device 6 according to the sensing pressure of the second pressure sensor;
when the filling pressure of the hydrogen production device 6 exceeds a set value, the switch valve 20 is closed, and the diaphragm compressor 1 is stopped.
When the filling pressure of the hydrogen production device 6 reaches a set value, the switch valve 20 is opened, in order to avoid overpressure of the pressure, the nitrogen enters the hydrogen production device 6 after being decompressed by the decompression valve 19, and the nitrogen meeting the pressure is supplied to the hydrogen production device 6; meanwhile, when a hydrogen fire accident happens, the device also has the function of introducing nitrogen meeting the pressure level into the system to remotely extinguish the fire.
Preferably, this application still includes the switch board PLC, and each sensor and the control valve (including trip valve and governing valve) of this application are connected with its electricity for remote control.
The working principle of the device is as follows, when hydrogen production maintenance is finished or an airtight pressure maintaining test is required, the first cut-off valve 10 and the third cut-off valve 9 are closed, the second cut-off valve 11 is opened, the switch valve 20 is opened, and the pressure reducing valve 19 adjusts an airtight detection pressure value; the control cabinet PLC is internally provided with a detection pressure value required by the electrolysis device, the diaphragm compressor 1 is started after the setting is finished, the first pressure sensor monitors the pressure of a test pipeline in real time, and the control cabinet PLC adjusts the opening of the first regulating valve 8 of the diaphragm compressor according to a set value to control the exhaust pressure of the compressor, so that the exhaust pressure required by a target is achieved. The safety valve is arranged on the first branch pipeline to prevent an overpressure accident condition from occurring during the airtight and pressure maintaining of the system, so that the safety of the detection of the system is ensured; and meanwhile, when the diaphragm compressor provides a gas source with proper pressure for the airtight test of the hydrogen production device, the second pressure sensor detects the pressure of the first branch pipeline, and when the pressure exceeds a set value, the interlocking diaphragm compressor is shut down.
Compared with the traditional airtight pressure maintaining, the pressure increasing device is required to be additionally arranged to provide a qualified gas source, the investment cost and the cost for purchasing nitrogen are very high, and the existing equipment is utilized to reduce the enterprise investment and the operation cost.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present application, the meaning of "a plurality" is two or more unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process, and alternate implementations are included within the scope of the preferred embodiment of the present application in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present application have been shown and described above, it will be understood that the above embodiments are exemplary and should not be construed as limiting the present application and that changes, modifications, substitutions and alterations in the above embodiments may be made by those of ordinary skill in the art within the scope of the present application.
Claims (9)
1. The utility model provides an utilize diaphragm compressor airtightness test system, its characterized in that, including the commonness in the hydrogen pipeline and the nitrogen gas pipeline of diaphragm compressor import side, diaphragm compressor's gas vent is connected with and fills the dress pipeline, it is used for filling hydrogen to fill the dress pipeline, it has the test pipeline still to communicate on the dress pipeline, the test pipeline is used for connecting hydrogen plant and carries out the gas tightness in order to fill the hydrogen plant and detect, still includes the intercommunication the test pipeline with the pressure regulating pipeline of nitrogen pipeline, diaphragm compressor's air inlet and gas vent pass through the nitrogen pipeline fill the dress pipeline with pressure regulating pipeline end to end connection forms from circulation circuit, be provided with first governing valve on the pressure regulating pipeline, diaphragm compressor's discharge pressure passes through first governing valve aperture control is adjusted.
2. The airtightness testing system using the diaphragm compressor as set forth in claim 1, wherein a first pressure sensor and a pressure gauge are provided on said test line.
3. The airtightness testing system using the diaphragm compressor according to claim 1, wherein a first cut-off valve is provided on said hydrogen gas line, and a second cut-off valve is provided on said nitrogen gas line.
4. The gas tightness testing system utilizing the diaphragm compressor according to claim 1, wherein said testing pipeline is connected to said hydrogen production device through a first branch pipeline.
5. The airtightness testing system with use of the diaphragm compressor as set forth in claim 4, wherein said first branch line is provided with a second pressure sensor.
6. The airtightness testing system using the diaphragm compressor according to claim 4, wherein a pressure reducing valve, an on-off valve and a check valve are further provided in sequence on the first branch line.
7. The airtightness testing system using a diaphragm compressor according to claim 4, further comprising a vent line, one end of which is connected to the first branch line, and the other end of which is connected to a flame arrester.
8. The gas tightness testing system utilizing the diaphragm compressor according to claim 1, wherein a liquid oxygen device is connected to said testing pipe through a second branch pipe, a hydrogen buffer tank is connected to said testing pipe through a third branch pipe, and a hydrogen filling device is connected to said testing pipe through a fourth pipe.
9. The airtightness testing system with the use of the diaphragm compressor according to claim 1, wherein a third cut-off valve is provided on the filling pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202123030016.1U CN217032924U (en) | 2021-11-30 | 2021-11-30 | Utilize airtight test system of diaphragm compressor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202123030016.1U CN217032924U (en) | 2021-11-30 | 2021-11-30 | Utilize airtight test system of diaphragm compressor |
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| CN217032924U true CN217032924U (en) | 2022-07-22 |
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| CN202123030016.1U Active CN217032924U (en) | 2021-11-30 | 2021-11-30 | Utilize airtight test system of diaphragm compressor |
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