Device for monitoring degradation of sealing ring of piston of pneumatic shuttle valve by using trace oxygen analyzer

Abstract

The utility model relates to a device for monitoring deterioration of a piston sealing ring of a pneumatic shuttle valve by a trace oxygen analyzer, which comprises a nitrogen-making compressor, the nitrogen-making compressor is connected with a compressed air pipeline, the other end of the compressed air pipeline is connected with an adsorption tower, and the top end of the adsorption tower is connected with a first high-purity nitrogen pipeline; a pneumatic shuttle valve is fixedly installed on the first high-purity nitrogen pipeline, the end of the first high-purity nitrogen pipeline is connected with a second high-purity nitrogen pipeline, an electric stop valve is fixedly installed at the end of the second high-purity nitrogen pipeline, and the other end of the electric stop valve is connected with a third high-purity nitrogen pipeline. The end part of the third high-purity nitrogen pipeline is connected with a high-purity nitrogen buffer tank; and the second high-purity nitrogen pipeline is fixedly connected with an oxygen analyzer. The pneumatic shuttle valve piston sealing ring aging monitoring device has the advantages of being reasonable in structural design, low in production and machining cost, convenient to operate, safe, reliable, convenient to maintain, capable of rapidly monitoring aging of a pneumatic shuttle valve piston sealing ring, high in monitoring efficiency and high in precision, and saving manpower and time.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic shuttle valve monitoring equipment, in particular to a device for monitoring the deterioration of the piston seal ring of a pneumatic shuttle valve by a trace oxygen analyzer. Background Technique

[0002] The pneumatic shuttle valve controls the on-off of the valve by the reciprocating movement of the piston through the inlet and outlet of the control air source on the valve body. The pneumatic actuator and the valve body are coaxially designed and adopt soft sealing. Compared with the traditional angle seat valve, the volume is greatly reduced, the flow rate is greatly increased, the cost is reduced, the switching is rapid, the switching speed is less than 0.3S / time, and the control air source pressure is only 0.3-0.5MPa. It is especially suitable for the pressure swing adsorption air separation equipment that requires rapid switching. However, when used in the nitrogen production system of the air-nitrogen station, due to the long service life of the pneumatic shuttle valve, when the piston seal ring of the pneumatic shuttle valve deteriorates, the instrument air that controls the piston movement of the pneumatic shuttle valve enters the high-purity nitrogen buffer tank, resulting in the problem that the oxygen content in the high-purity nitrogen buffer tank is too high to be used.

[0003] To overcome the above disadvantages, the solution of the prior art is to release the nitrogen in the high-purity nitrogen buffer tank into the atmosphere when it is found that the oxygen content in the high-purity nitrogen buffer tank is too high, operate the standby nitrogen production compressor, and regularly remove all the pneumatic shuttle valves in the nitrogen production system of the air-nitrogen station by mechanical maintenance workers to check the deterioration of the piston seal ring of the pneumatic shuttle valve. During this process, there is a waste of high-purity nitrogen and a waste of the human resources of mechanical maintenance workers. During the regular large-scale disassembly of the pneumatic shuttle valve, it is easy to cause object hitting and mechanical injury accidents, and there are risks in terms of safety, which is not conducive to the control of the safety of the maintenance process. Content of the Utility Model

[0004] The purpose of the utility model is to provide a monitoring device for the piston seal ring of a pneumatic shuttle valve, which has a reasonable structural design, low production and processing costs, convenient operation, safety and reliability, saves manpower, saves time, is easy to maintain, can quickly monitor the aging of the piston seal ring of the pneumatic shuttle valve, and has high monitoring efficiency and high precision.

[0005] A device for monitoring the deterioration of the piston seal ring of a pneumatic shuttle valve by a trace oxygen analyzer of the utility model includes a nitrogen production compressor, the nitrogen production compressor is connected with a compressed air pipeline, the other end of the compressed air pipeline is connected with an adsorption tower, and the top of the adsorption tower is connected with a first high-purity nitrogen pipeline; a pneumatic shuttle valve is fixedly installed on the first high-purity nitrogen pipeline, the end of the first high-purity nitrogen pipeline is connected with a second high-purity nitrogen pipeline, an electric cut-off valve is fixedly installed at the end of the second high-purity nitrogen pipeline, the other end of the electric cut-off valve is connected with a third high-purity nitrogen pipeline, and the end of the third high-purity nitrogen pipeline is connected with a high-purity nitrogen buffer tank; an oxygen analyzer is fixedly connected to the second high-purity nitrogen pipeline.

[0006] One side of the described oxygen analyzer is connected to an oxygen analyzer signal cable, and the oxygen analyzer signal cable is connected to the Emerson DCS.

[0007] An oxygen analyzer is set, and one side of the oxygen analyzer is connected to an oxygen analyzer signal cable, and the oxygen analyzer signal cable is connected to the Emerson DCS. In this way, the main operator of the air-nitrogen station can judge the oxygen content of the high-purity nitrogen in the second high-purity nitrogen pipeline by monitoring the DCS working condition screen, and the Emerson DCS will automatically alarm when the oxygen content increases to 0.05%. When the oxygen content value displayed in the oxygen analyzer is convenient for mechanical maintenance operators to judge whether the piston seal ring of the pneumatic shuttle valve is deteriorated. The specific judgment method is as follows: The nitrogen purity in the second high-purity nitrogen pipeline is 99.99%, and the oxygen content is 0.01%. When the piston seal ring of the pneumatic shuttle valve is deteriorated, the instrument air in the first inlet pipe or the second inlet pipe of the pneumatic shuttle valve will enter the second high-purity nitrogen pipeline, causing the oxygen content in the second high-purity nitrogen pipeline to soar, which is convenient for mechanical maintenance operators to judge that the piston seal ring of the pneumatic shuttle valve has deteriorated. It can be replaced and repaired at the first time when the piston seal ring of the pneumatic shuttle valve deteriorates. The visualization display is accurate in monitoring, high in monitoring efficiency, convenient in operation, time-saving and labor-saving. It can assist mechanical maintenance operators to make accurate judgments, can be replaced and repaired at the first time when the piston seal ring of the pneumatic shuttle valve deteriorates, and can avoid further safety accidents, fully ensuring the safety of the operator's working environment.

[0008] The described electric cut-off valve is connected to an electric valve control cable, and the electric valve control cable is connected to the Emerson DCS.

[0009] Connecting the electric cut-off valve to the Emerson DCS through the electric valve control cable can facilitate the main operator of the air-nitrogen station to cut off the nitrogen containing trace oxygen in the second high-purity nitrogen pipeline from entering after starting the nitrogen production compressor, avoiding the occurrence of the oxygen content in the high-purity nitrogen buffer tank rising to an unqualified situation. The operation is convenient, safe and reliable.

[0010] The described pneumatic shuttle valve includes a pneumatic shuttle valve upper valve body and a pneumatic shuttle valve lower valve body. A pneumatic shuttle valve piston is installed between the pneumatic shuttle valve upper valve body and the pneumatic shuttle valve lower valve body, and a pneumatic shuttle valve piston seal ring is installed on the pneumatic shuttle valve piston.

[0011] A connecting flange is installed on the first high-purity nitrogen pipeline, and the second high-purity nitrogen pipeline is connected through the connecting flange.

[0012] An air-operated shuttle valve pipe valve air inlet is provided on the pipe wall of the first high-purity nitrogen pipeline. The air-operated shuttle valve pipe valve air inlet is connected to a second air-operated shuttle valve inlet pipe, and the end of the second air-operated shuttle valve inlet pipe is fixedly connected to an instrument air pipeline; an air-operated shuttle valve open valve air inlet is provided on the air-operated shuttle valve, and the air-operated shuttle valve open valve air inlet is connected to a first air-operated shuttle valve inlet pipe, and the end of the first air-operated shuttle valve inlet pipe is fixedly connected to an instrument air pipeline.

[0013] The functions of the provided first air-operated shuttle valve inlet pipe and the second air-operated shuttle valve inlet pipe are to introduce instrument air into the first high-purity nitrogen pipeline and the air-operated shuttle valve.

[0014] The number of the adsorption towers is two, and an equalizing valve is fixedly installed between the two adsorption towers.

[0015] By setting the adsorption towers to two, a standby mechanism can be adopted. When one of the adsorption towers fails, the other adsorption tower operates to ensure the smooth progress of the entire working process and improve work efficiency; when the two adsorption towers operate simultaneously, the setting of the equalizing valve can make the pressure values in the two adsorption towers equivalent, which is safe and reliable.

[0016] Advantages of the present utility model:

[0017] 1) An oxygen analyzer is provided, and an oxygen analyzer signal cable is connected to one side of the oxygen analyzer. The oxygen analyzer signal cable is connected to the Emerson DCS. In this way, the main operator of the air-nitrogen station can judge the oxygen content of the high-purity nitrogen in the second high-purity nitrogen pipeline by monitoring the DCS working condition screen, and the Emerson DCS will automatically alarm when the oxygen content increases to 0.05%; when the oxygen content value displayed in the oxygen analyzer is convenient for mechanical maintenance operators to judge whether the piston seal ring of the air-operated shuttle valve is deteriorated. The specific judgment method is as follows: the nitrogen purity in the second high-purity nitrogen pipeline is 99.99% and the oxygen content is 0.01%. When the piston seal ring of the air-operated shuttle valve is deteriorated, the instrument air in the first air-operated shuttle valve inlet pipe or the second air-operated shuttle valve inlet pipe will enter the second high-purity nitrogen pipeline, causing the oxygen content in the second high-purity nitrogen pipeline to soar, which is convenient for mechanical maintenance operators to judge that the piston seal ring of the air-operated shuttle valve has deteriorated; it can be replaced and repaired in the first time when the piston seal ring of the air-operated shuttle valve deteriorates. The visual display, accurate monitoring, high monitoring efficiency, convenient operation, time-saving and labor-saving, can assist mechanical maintenance operators to make accurate judgments, can be replaced and repaired in the first time when the piston seal ring of the air-operated shuttle valve deteriorates, and avoid further safety accidents, fully ensuring the safety of the working environment of the operators.

[0018] 2) Connect the electric cut-off valve to the Emerson DCS through the electric valve control cable. After starting the nitrogen production compressor, the main operator in the air-nitrogen station can easily cut off the nitrogen containing trace oxygen in the second high-purity nitrogen pipeline from entering, avoiding the oxygen content in the high-purity nitrogen buffer tank rising to an unqualified level. The operation is convenient, safe and reliable.

[0019] 3) Set two adsorption towers, and a standby mechanism can be adopted. When one adsorption tower fails, the other adsorption tower operates to ensure the smooth progress of the whole working process and improve work efficiency; when the two adsorption towers operate simultaneously, the setting of the equalizing valve can make the pressure values in the two adsorption towers equivalent, which is safe and reliable.

[0020] 4) It has a relatively low cost, simple installation and operation, reliable use, and convenient maintenance. It well solves the problem that when the pneumatic shuttle valve is used in the nitrogen production system of the air-nitrogen station, due to the long service life of the pneumatic shuttle valve, the piston seal ring of the pneumatic shuttle valve deteriorates seriously, and the instrument air controlling the piston movement of the pneumatic shuttle valve enters the high-purity nitrogen buffer tank, resulting in the oxygen content in the high-purity nitrogen buffer tank being too high to be used.

[0021] 5) The main operator in the air-nitrogen station monitors the real-time value of the oxygen analyzer on the Emerson DCS screen. When the value slowly increases from 0.01% to 0.05%, the Emerson DCS will automatically alarm. After the main operator in the air-nitrogen station confirms the alarm, it can be judged that the piston seal ring of the pneumatic shuttle valve deteriorates, resulting in the leakage of instrument air into the second high-purity nitrogen pipeline. The main operator in the air-nitrogen station promptly contacts the mechanical maintenance worker to prepare for replacing the piston seal ring of the pneumatic shuttle valve. At the same time, transfer the standby nitrogen production compressor. After the standby nitrogen production compressor operates, cut off the electric cut-off valve to prevent the instrument air in the instrument air pipeline from continuing to enter the high-purity nitrogen buffer tank through the first / second air inlet pipes of the pneumatic shuttle valve, ensuring that the mechanical maintenance worker can replace and repair the piston seal ring of the pneumatic shuttle valve at the first time in the initial stage of the deterioration of the piston seal ring of the pneumatic shuttle valve, preventing the large amount of instrument air from entering the high-purity nitrogen buffer tank due to the failure to detect the deterioration of the piston seal ring of the pneumatic shuttle valve in time, resulting in the passive shutdown of other processes due to unqualified nitrogen or no nitrogen available, and ensuring the stable production of other processes using high-purity nitrogen. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present invention;

[0023] Figure 2 is a schematic structural diagram of the pneumatic shuttle valve in the present invention.

[0024] In the figure: 1. Nitrogen production compressor; 2. Compressed air pipeline; 3. Equalizing valve; 4. Adsorption tower A / B; 5. First high-purity nitrogen pipeline; 6. Pneumatic shuttle valve; 7. Pneumatic shuttle valve open valve air inlet; 8. First inlet pipe of pneumatic shuttle valve; 9. Pneumatic shuttle valve pipe valve air inlet; 10. Second inlet pipe of pneumatic shuttle valve; 11. Instrument air pipeline; 12. Second high-purity nitrogen pipeline; 13. Oxygen analyzer; 14. Electric cut-off valve; 15. Third high-purity nitrogen pipeline; 16. High-purity nitrogen buffer tank; 17. Electric valve control cable; 18. Oxygen analyzer signal cable; 19. Emerson DCS; 20. Upper valve body of pneumatic shuttle valve; 21. Lower valve body of pneumatic shuttle valve; 22. Pneumatic shuttle valve piston; 23. Pneumatic shuttle valve piston seal ring. Detailed implementation mode

[0025] Example 1.

[0026] The following will be combined with the attached Figure 1-2 This utility model will be further described.

[0027] This utility model includes a nitrogen production compressor 1; a compressed air pipeline 2; an adsorption tower 4; a first high-purity nitrogen pipeline 5; a pneumatic shuttle valve 6; a pneumatic shuttle valve open valve air inlet 7; a first inlet pipe 8 of the pneumatic shuttle valve; a pneumatic shuttle valve pipe valve air inlet 9; a second inlet pipe 10 of the pneumatic shuttle valve; an instrument air pipeline 11; a second high-purity nitrogen pipeline 12; an oxygen analyzer 13; an electric cut-off valve 14; a third high-purity nitrogen pipeline 15; a high-purity nitrogen buffer tank 16; an oxygen analyzer signal cable 18; an Emerson DCS 19; an upper valve body 20 of the pneumatic shuttle valve; a lower valve body 21 of the pneumatic shuttle valve; a pneumatic shuttle valve piston 22; a pneumatic shuttle valve piston seal ring 23. Specifically, the structure includes a nitrogen production compressor 1, the nitrogen production compressor 1 is connected to the compressed air pipeline 2, the other end of the compressed air pipeline 2 is connected to the adsorption tower 4, the top of the adsorption tower 4 is connected with a first high-purity nitrogen pipeline 5; a pneumatic shuttle valve 6 is fixedly installed on the first high-purity nitrogen pipeline 5, the end of the first high-purity nitrogen pipeline 5 is connected to the second high-purity nitrogen pipeline 12, an electric cut-off valve 14 is fixedly installed at the end of the second high-purity nitrogen pipeline 12, the other end of the electric cut-off valve 14 is connected to the third high-purity nitrogen pipeline 15, and the end of the third high-purity nitrogen pipeline 15 is connected with a high-purity nitrogen buffer tank 16; an oxygen analyzer 13 is fixedly connected to the second high-purity nitrogen pipeline 12.

[0028] One side of the oxygen analyzer 13 is connected with an oxygen analyzer signal cable 18, and the oxygen analyzer signal cable 18 is connected into the Emerson DCS 19.

[0029] The pneumatic shuttle valve 6 includes an upper valve body 20 of the pneumatic shuttle valve and a lower valve body 21 of the pneumatic shuttle valve. A pneumatic shuttle valve piston 22 is installed between the upper valve body 20 of the pneumatic shuttle valve and the lower valve body 21 of the pneumatic shuttle valve, and a pneumatic shuttle valve piston seal ring 23 is installed on the pneumatic shuttle valve piston 22.

[0030] A connecting flange is installed on the first high-purity nitrogen pipeline 5, and a second high-purity nitrogen pipeline 12 is connected through the connecting flange.

[0031] An air-operated shuttle valve pipe valve air inlet 9 is provided on the pipe wall of the first high-purity nitrogen pipeline 5. The air-operated shuttle valve pipe valve air inlet 9 is connected to an air-operated shuttle valve second inlet pipe 10, and the end of the air-operated shuttle valve second inlet pipe 10 is fixedly connected to an instrument air pipeline 11; an air-operated shuttle valve opening valve air inlet 7 is provided on the air-operated shuttle valve 6, and the air-operated shuttle valve opening valve air inlet 7 is connected to an air-operated shuttle valve first inlet pipe 8, and the end of the air-operated shuttle valve first inlet pipe 8 is fixedly connected to an instrument air pipeline 11.

[0032] The oxygen analyzer 13 is an insertion type oxygen analyzer, and the model is: HJ78-WDG-INSITU; a hole with a diameter of φ20 can be enlarged on the pipe wall of the second high-purity nitrogen pipeline 12 and a threaded pipe with a length of 20 mm is welded, and the oxygen analyzer 13 is inserted; the model of the Emerson DCS19 is: UHA1R0050.

[0033] Usage method: The main operator of the air-nitrogen station monitors the real-time value of the oxygen analyzer 13 on the Emerson DCS19 screen. When its value slowly increases from 0.01% to 0.05%, the Emerson DCS19 will automatically alarm. After the main operator of the air-nitrogen station confirms the alarm, it can be judged that the piston seal ring 23 of the air-operated shuttle valve deteriorates, resulting in a small amount of instrument air leaking into the second high-purity nitrogen pipeline 12. The main operator of the air-nitrogen station promptly contacts the mechanical maintenance staff to prepare for replacing the piston seal ring 23 of the air-operated shuttle valve. At the same time, transfer the standby nitrogen production compressor. After the standby nitrogen production compressor runs, cut off the electric cut-off valve 14 to prevent the instrument air in the instrument air pipeline 11 from continuing to enter the high-purity nitrogen buffer tank 16 through the air-operated shuttle valve first inlet pipe 8 and the air-operated shuttle valve second inlet pipe 10, ensuring that the mechanical maintenance worker can replace and repair the piston seal ring 23 of the air-operated shuttle valve in the first time at the initial stage of the deterioration of the piston seal ring 23 of the air-operated shuttle valve, preventing the piston seal ring 23 of the air-operated shuttle valve from deteriorating without being discovered in time, and a large amount of instrument air enters the high-purity nitrogen buffer tank 16, resulting in passive shutdown of other processes due to unqualified nitrogen or no nitrogen available, ensuring the stable production of other processes using high-purity nitrogen.

[0034] Embodiment 2.

[0035] The utility model includes a nitrogen production compressor 1; a compressed air pipeline 2; an equalizing valve 3; an adsorption tower 4; a first high-purity nitrogen pipeline 5; a pneumatic shuttle valve 6; a pneumatic shuttle valve open valve air inlet 7; a pneumatic shuttle valve first air inlet pipe 8; a pneumatic shuttle valve pipe valve air inlet 9; a pneumatic shuttle valve second air inlet pipe 10; an instrument air pipeline 11; a second high-purity nitrogen pipeline 12; an oxygen analyzer 13; an electric cut-off valve 14; a third high-purity nitrogen pipeline 15; a high-purity nitrogen buffer tank 16; an electric valve control cable 17; an oxygen analyzer signal cable 18; Emerson DCS 19; a pneumatic shuttle valve upper valve body 20; a pneumatic shuttle valve lower valve body 21; a pneumatic shuttle valve piston 22; a pneumatic shuttle valve piston sealing ring 23. The specific structure includes a nitrogen production compressor 1, the nitrogen production compressor 1 is connected to the compressed air pipeline 2, the other end of the compressed air pipeline 2 is connected to the adsorption tower 4, the top of the adsorption tower 4 is connected with a first high-purity nitrogen pipeline 5; a pneumatic shuttle valve 6 is fixedly installed on the first high-purity nitrogen pipeline 5, the end of the first high-purity nitrogen pipeline 5 is connected to the second high-purity nitrogen pipeline 12, an electric cut-off valve 14 is fixedly installed at the end of the second high-purity nitrogen pipeline 12, the other end of the electric cut-off valve 14 is connected to the third high-purity nitrogen pipeline 15; the end of the third high-purity nitrogen pipeline 15 is connected with a high-purity nitrogen buffer tank 16; an oxygen analyzer 13 is fixedly connected to the second high-purity nitrogen pipeline 12.

[0036] One side of the oxygen analyzer 13 is connected with an oxygen analyzer signal cable 18, and the oxygen analyzer signal cable 18 is connected into the Emerson DCS 19.

[0037] The pneumatic shuttle valve 6 includes a pneumatic shuttle valve upper valve body 20 and a pneumatic shuttle valve lower valve body 21, a pneumatic shuttle valve piston 22 is installed between the pneumatic shuttle valve upper valve body 20 and the pneumatic shuttle valve lower valve body 21, and a pneumatic shuttle valve piston sealing ring 23 is installed on the pneumatic shuttle valve piston 22.

[0038] A connecting flange is installed on the first high-purity nitrogen pipeline 5, and the second high-purity nitrogen pipeline 12 is connected through the connecting flange.

[0039] The electric cut-off valve 14 is connected with an electric valve control cable 17, and the electric valve control cable 17 is connected into the Emerson DCS 19.

[0040] A pneumatic shuttle valve pipe valve air inlet 9 is arranged on the pipe wall of the first high-purity nitrogen pipeline 5, the pneumatic shuttle valve pipe valve air inlet 9 is connected with a pneumatic shuttle valve second air inlet pipe 10, and the end of the pneumatic shuttle valve second air inlet pipe 10 is fixedly connected with an instrument air pipeline 11; a pneumatic shuttle valve open valve air inlet 7 is arranged on the pneumatic shuttle valve 6, the pneumatic shuttle valve open valve air inlet 7 is connected with a pneumatic shuttle valve first air inlet pipe 8, and the end of the pneumatic shuttle valve first air inlet pipe 8 is fixedly connected with an instrument air pipeline 11.

[0041] The number of the adsorption towers 4 is two, and an equalizing valve 3 is fixedly installed between the two adsorption towers 4.

[0042] The oxygen analyzer 13 mentioned above is an insertion type oxygen analyzer, with the model: HJ78-WDG-INSITU; a hole with a diameter of φ20 can be drilled and welded with a threaded pipe with a length of 20 mm on the pipe wall of the second high-purity nitrogen pipeline 12, and the oxygen analyzer 13 is inserted; the model of the Emerson DCS19 is: UHA1R0050.

[0043] Usage method: The main operator of the empty nitrogen station monitors the real-time value of the oxygen analyzer 13 on the Emerson DCS19 screen. When its value slowly increases from 0.01% to 0.05%, the Emerson DCS19 will automatically alarm. After the main operator of the empty nitrogen station confirms the alarm, it can be judged that the piston seal ring 23 of the pneumatic shuttle valve deteriorates, resulting in a small amount of instrument air leaking into the second high-purity nitrogen pipeline 12. The main operator of the empty nitrogen station promptly contacts the mechanical maintenance staff to prepare for replacing the piston seal ring 23 of the pneumatic shuttle valve. At the same time, transfer the standby nitrogen production compressor. After the standby nitrogen production compressor runs, cut off the electric cut-off valve 14 to prevent the instrument air in the instrument air pipeline 11 from continuing to enter the high-purity nitrogen buffer tank 16 through the first intake pipe 8 and the second intake pipe 10 of the pneumatic shuttle valve, ensuring that the mechanical maintenance worker can replace and repair the piston seal ring 23 of the pneumatic shuttle valve in the first time at the initial stage of deterioration, preventing the piston seal ring 23 of the pneumatic shuttle valve from deteriorating without being discovered in time, and a large amount of instrument air entering the high-purity nitrogen buffer tank 16, resulting in passive production stoppage of other processes due to unqualified nitrogen or lack of nitrogen, ensuring the stable production of other processes using high-purity nitrogen.

[0044] The electric cut-off valve 14 is connected to the Emerson DCS19 through the electric valve control cable 17, which can facilitate the main operator of the empty nitrogen station to cut off the nitrogen containing a small amount of oxygen in the second high-purity nitrogen pipeline 12 from continuing to enter after starting the standby nitrogen production compressor, avoiding the occurrence of the oxygen content in the high-purity nitrogen buffer tank 16 rising to an unqualified situation.

[0045] Two adsorption towers 4 are set, and a standby mechanism can be adopted. When one of the adsorption towers 4 fails, the other adsorption tower 4 operates to ensure the smooth progress of the whole working process and improve work efficiency; when the two adsorption towers 4 operate simultaneously, the setting of the equalizing valve 3 can make the pressure values in the two adsorption towers 4 equivalent, which is safe and reliable.

Claims

1. A device for monitoring the deterioration of a piston seal ring of a pneumatic shuttle valve by a trace oxygen analyzer, comprising a nitrogen generator compressor (1), characterized in that: The nitrogen generator compressor (1) is connected to a compressed air pipeline (2), the other end of the compressed air pipeline (2) is connected to an adsorption tower (4), the top of the adsorption tower (4) is connected to a first high-purity nitrogen pipeline (5); a pneumatic shuttle valve (6) is fixedly installed on the first high-purity nitrogen pipeline (5), the end of the first high-purity nitrogen pipeline (5) is connected to a second high-purity nitrogen pipeline (12), the end of the second high-purity nitrogen pipeline (12) is fixedly installed with an electric shut-off valve (14), the other end of the electric shut-off valve (14) is connected to a third high-purity nitrogen pipeline (15), the end of the third high-purity nitrogen pipeline (15) is connected to a high-purity nitrogen buffer tank (16); the second high-purity nitrogen pipeline (12) is fixedly connected to an oxygen analyzer (13).

2. A device for monitoring the deterioration of a piston seal ring of a pneumatic shuttle valve by a trace oxygen analyzer as claimed in claim 1, characterized in that: One side of the oxygen analyzer (13) is connected to an oxygen analyzer signal cable (18), and the oxygen analyzer signal cable (18) is connected to the Emerson DCS (19).

3. A device for monitoring the deterioration of a piston seal ring of a pneumatic shuttle valve by a trace oxygen analyzer as claimed in claim 2, characterized in that: The electric shut-off valve (14) is connected to an electric valve control cable (17), and the electric valve control cable (17) is connected to the Emerson DCS (19).

4. A device for monitoring the deterioration of a piston seal ring of a pneumatic shuttle valve by a trace oxygen analyzer as claimed in claim 3, characterized in that: The pneumatic shuttle valve (6) comprises a pneumatic shuttle valve upper valve body (20) and a pneumatic shuttle valve lower valve body (21), a pneumatic shuttle valve piston (22) is installed between the pneumatic shuttle valve upper valve body (20) and the pneumatic shuttle valve lower valve body (21), and a pneumatic shuttle valve piston sealing ring (23) is installed on the pneumatic shuttle valve piston (22).

5. A device for monitoring the deterioration of a piston seal ring of a pneumatic shuttle valve by a trace oxygen analyzer as claimed in claim 4, characterized in that: The first high-purity nitrogen pipeline (5) is provided with a connecting flange, and is connected to a second high-purity nitrogen pipeline (12) via the connecting flange.

6. A device for monitoring the deterioration of a piston seal ring of a pneumatic shuttle valve by a trace oxygen analyzer as claimed in claim 5, characterized in that: A pneumatic shuttle valve air inlet (9) is provided on the pipe wall of the first high-purity nitrogen pipeline (5), the pneumatic shuttle valve air inlet (9) is connected to a pneumatic shuttle valve second air inlet (10), and the end of the pneumatic shuttle valve second air inlet (10) is fixedly connected to an instrument air pipeline (11); a pneumatic shuttle valve opening air inlet (7) is provided on the pneumatic shuttle valve (6), the pneumatic shuttle valve opening air inlet (7) is connected to a pneumatic shuttle valve first air inlet (8), and the end of the pneumatic shuttle valve first air inlet (8) is fixedly connected to an instrument air pipeline (11).

7. A device for monitoring the deterioration of a piston seal ring of a pneumatic shuttle valve by a trace oxygen analyzer as claimed in claim 6, characterized in that: The number of the adsorption towers (4) is two, and a pressure equalizing valve (3) is fixedly installed between the two adsorption towers (4).

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