Sealing and anti-corrosion device for cylinder body of circulating hydrogen centrifugal compressor cylinder

Abstract

A new hydrogen branch pipe and a sealing pipe are arranged on a buffer tank, the sealing pipe is communicated with an air cylinder high-pressure end air inlet pipe and an air cylinder low-pressure end air inlet pipe of the circulating hydrogen centrifugal compressor, and a one-way valve I and a stop valve I are arranged on the sealing pipe. A circulating hydrogen header pipe is arranged at the exhaust end of the circulating hydrogen centrifugal compressor, and the stop valve I is electrically connected with the DCS. According to the utility model, by utilizing the convenience of the device placement position in a plant, the exhaust pipe is arranged on the new hydrogen compressor and is communicated with the buffer tank, and the cylinder high-pressure end air inlet pipe and the cylinder low-pressure end air inlet pipe are respectively arranged between the buffer tank and the cylinder high-pressure end air inlet and the cylinder low-pressure end air inlet of the circulating hydrogen compressor; and the air cylinder high-pressure end air inlet pipe and the air cylinder low-pressure end air inlet pipe are designed to be connected in parallel, are communicated through a tee joint and then are communicated with the sealing pipe, so that high-purity hydrogen is conveyed into the circulating hydrogen centrifugal compressor to serve as air cylinder body sealing gas.

Description

Technical Field

[0001] This utility model belongs to the field of dry gas sealing technology for centrifugal compressor cylinders, specifically relating to a corrosion-resistant sealing device for the cylinder body of a circulating hydrogen centrifugal compressor. Background Technology

[0002] The dry gas seal consists of front and rear return gaps and a flow control orifice. When the rotor rotates centrifugally relative to the rotor cover, the working airflow drives the gas to form a gas film, separating the two interconnected return gaps. A flow control orifice is located at a specific position between the radial edge of the rotor and the cover. This orifice continuously adjusts the flow rate to form a dry gas seal for the compressor. The centrifugal compressor dry gas seal utilizes the airflow between the high-speed rotating rotor and the rotor cover, combined with a specific sealing structure and gas circulation mechanism, to achieve gas sealing and compression. This sealing method effectively prevents gas leakage and improves the compressor's efficiency and safety.

[0003] The new hydrogen compressor is a reciprocating compressor, while the circulating hydrogen compressor is a centrifugal compressor. The circulating hydrogen compressor uses its own outlet circulating hydrogen as the dry sealing gas for the cylinder body. However, the circulating hydrogen contains a high content of hydrogen sulfide, which not only easily corrodes pipelines but also greatly shortens the service life of the compressor cylinder seals. There is also the possibility of liquid in the circulating hydrogen. Since liquid is incompressible, it can cause sudden overpressure, damage the equipment, and in severe cases, cause explosions and fires.

[0004] To overcome the above shortcomings, the existing solution is to shut down the backup unit for maintenance when the pipeline and compressor cylinder seals are severely corroded. This not only wastes manpower and resources, but also fails to solve the problem of liquid in the circulating hydrogen, posing a significant safety hazard. Once liquid is present in the circulating hydrogen, it can cause sudden overpressure damage to the cylinder, and in severe cases, it can lead to explosions and fires, causing safety accidents. Utility Model Content

[0005] The purpose of this invention is to provide a corrosion-resistant sealing device for the cylinder body of a circulating hydrogen centrifugal compressor to solve the above-mentioned problems.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A corrosion-resistant sealing device for the cylinder body of a circulating hydrogen centrifugal compressor includes a circulating hydrogen centrifugal compressor, a fresh hydrogen compressor, and a buffer tank connected to the fresh hydrogen compressor. A fresh hydrogen branch pipe and a sealing pipe are sequentially installed at the outlet end of the buffer tank. A high-pressure inlet pipe and a low-pressure inlet pipe are respectively installed at the high-pressure and low-pressure inlets of the circulating hydrogen centrifugal compressor cylinder. The sealing pipe is connected to both the high-pressure and low-pressure inlet pipes. A one-way valve I and a shut-off valve I are sequentially installed on the sealing pipe along the gas flow direction. A circulating hydrogen main pipe is installed at the exhaust end of the circulating hydrogen centrifugal compressor. The shut-off valve I is electrically connected to a DCS (Distributed Control System). The one-way valve I ensures unidirectional flow of fresh hydrogen within the sealing pipe, and the shut-off valve I allows for rapid remote shut-off of the fresh hydrogen supply via the DCS after the circulating hydrogen compressor stops.

[0008] To further realize this utility model, a pressure transmitter I is installed on the sealed tube, and a pressure transmitter II is installed on the circulating hydrogen main pipe. Pressure transmitter I and pressure transmitter II are electrically connected to the DCS. Pressure transmitter I can detect the pressure of high-purity hydrogen in the sealed tube in real time, and pressure transmitter II can monitor the pressure of circulating hydrogen in the circulating hydrogen main pipe in real time.

[0009] To further realize this utility model, flow meters are respectively installed on the high-pressure end inlet pipe and the low-pressure end inlet pipe of the cylinder, and the flow meters are electrically connected to the DCS. The flow meters can monitor the flow rate of fresh hydrogen in the high-pressure end inlet pipe and the low-pressure end inlet pipe of the cylinder in real time, and can promptly alarm the DCS when the flow rate decreases under abnormal conditions.

[0010] To further realize this utility model, an emergency mechanism is provided between the circulating hydrogen main pipe and the sealing pipe. The emergency mechanism includes an outlet branch pipe, the inlet end of which is connected to the circulating hydrogen main pipe, and the outlet end of which is connected to the sealing pipe. Along the gas flow direction, the outlet branch pipe is sequentially equipped with a shut-off valve, a basket filter, a cut-off valve II, a pneumatic regulating valve I, and a check valve II. A check valve III is provided between the pressure transmitter I and the outlet end of the outlet branch pipe. The shut-off valve, cut-off valve II, pneumatic regulating valve I, and check valve III are electrically connected to the DCS. Depending on whether circulating hydrogen is used as the sealing gas for the circulating hydrogen compressor cylinder, the cut-off valve II and check valve II can be remotely controlled to prevent new hydrogen from entering the outlet branch pipe of the circulating hydrogen compressor. In an emergency where the new hydrogen compressor completely stops operating, the outlet gas of the circulating hydrogen compressor can be used as the sealing gas for a short period of time, and the check valve III can prevent circulating hydrogen in the outlet branch pipe of the circulating hydrogen compressor from entering the sealing pipe.

[0011] To further realize this utility model, a de-gassing pipe is provided between the one-way valve I of the sealing pipe and the exhaust end of the new hydrogen branch pipe. A one-way valve IV is installed on the de-gassing pipe, and the one-way valve IV is electrically connected to the DCS. The one-way valve IV ensures unidirectional flow of new hydrogen within the de-gassing pipe.

[0012] To further realize this utility model, the new hydrogen compressor includes new hydrogen compressor I and new hydrogen compressor II, and the buffer tank includes buffer tank I and buffer tank II. An exhaust pipe I connects new hydrogen compressor I and buffer tank I, and an exhaust pipe II connects new hydrogen compressor II and buffer tank II. The new hydrogen branch pipes of buffer tank I and buffer tank II are respectively connected to the inlet end of the sealing pipe. The new hydrogen branch pipes of buffer tank I and buffer tank II are connected in parallel and are connected to the sealing pipe via a tee.

[0013] To further realize this utility model, a pneumatic regulating valve II is provided between the one-way valve I and the shut-off valve I of the sealing tube. The pneumatic regulating valve II controls the pressure required for the new hydrogen in the sealing tube by transmitting the pressure value to the DSC through the pressure transmitter I.

[0014] To further realize this utility model, the flow meter is a vortex flow meter.

[0015] The advantages of this utility model compared to the prior art are as follows:

[0016] Since the new hydrogen discharged from the new hydrogen compressor is 99.99% high-purity hydrogen, which is free of corrosive impurities such as hydrogen sulfide, this high-purity hydrogen can be used as the dry sealing gas for the circulating hydrogen compressor. This can significantly extend the service life of the pipeline cylinder seals and ensure that the circulating hydrogen compressor can operate stably and safely for a long time. It can not only stably supply circulating hydrogen to the hydrogen refueling unit, but also ensure the qualification rate of the hydrogen refueling unit products.

[0017] Since the circulating hydrogen compressor is located next to the new hydrogen compressor in the hydrogen refueling unit's compressor plant, this utility model takes advantage of the convenient placement of the equipment within the plant. An exhaust pipe is installed on the new hydrogen compressor and connected to a buffer tank. A cylinder high-pressure end inlet pipe and a cylinder low-pressure end inlet pipe are respectively installed between the buffer tank and the cylinder high-pressure end inlet port and the cylinder low-pressure end inlet port of the circulating hydrogen compressor. The cylinder high-pressure end inlet pipe and the cylinder low-pressure end inlet pipe are designed to be connected in parallel. They are connected through a T-junction and then connected to a sealing pipe, thereby delivering high-purity hydrogen into the circulating hydrogen centrifugal compressor as the cylinder body sealing gas. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] The meanings of the reference numerals in the attached diagram are as follows: 1. New hydrogen compressor; 1-1. New hydrogen compressor I; 1-2. New hydrogen compressor II; 2. Buffer tank; 2-1. Buffer tank I; 2-2. Buffer tank II; 3. New hydrogen branch pipe; 4. Sealing pipe; 5. Circulating hydrogen centrifugal compressor; 6. Cylinder high-pressure end inlet pipe; 7. Cylinder low-pressure end inlet pipe; 8. One-way valve I; 9. Shut-off valve I; 10. Circulating hydrogen main pipe; 11. Pressure transmitter I; 12. Pressure transmitter II; 13. Flow meter; 14. Outlet branch pipe; 15. Shut-off valve; 16. Basket filter; 17. Shut-off valve II; 18. Pneumatic regulating valve I; 19. One-way valve II; 20. One-way valve III; 21. To-device pipe; 22. One-way valve IV; 23-1. Exhaust pipe I; 23-2. Exhaust pipe II; 24. Pneumatic regulating valve II. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown, a cylinder sealing and corrosion prevention device for a circulating hydrogen centrifugal compressor includes a circulating hydrogen centrifugal compressor 5, a new hydrogen compressor 1, and a buffer tank 2 connected to the new hydrogen compressor 1. A new hydrogen branch pipe 3 and a sealing pipe 4 are sequentially arranged at the outlet end of the buffer tank 2. A high-pressure inlet pipe 6 and a low-pressure inlet pipe 7 are respectively provided at the high-pressure inlet and low-pressure inlet of the cylinder of the circulating hydrogen centrifugal compressor 5. The sealing pipe 4 is connected to both the high-pressure inlet pipe 6 and the low-pressure inlet pipe 7. The end inlet pipe 7 is connected. Flow meters 13 are respectively installed on the high-pressure end inlet pipe 6 and the low-pressure end inlet pipe 7 of the cylinder. The flow meters 13 are vortex flow meters. One-way valve I8 and shut-off valve I9 ​​are sequentially installed on the sealing pipe 4 along the gas flow direction. A pneumatic regulating valve II24 is installed between the one-way valve I8 and the shut-off valve I9 ​​of the sealing pipe 4. A go-to-device pipe 21 is installed between the one-way valve I8 of the sealing pipe 4 and the exhaust end of the new hydrogen branch pipe 3. One-way valve IV22 is installed on the go-to-device pipe 21.

[0022] A pressure transmitter I11 is installed on the sealing pipe 4. A one-way valve III20 is installed between the pressure transmitter I11 and the exhaust end of the outlet branch pipe 14. A circulating hydrogen main pipe 10 is installed at the exhaust end of the circulating hydrogen centrifugal compressor 5. A pressure transmitter II12 is installed on the circulating hydrogen main pipe 10. An emergency mechanism is installed between the circulating hydrogen main pipe 10 and the sealing pipe 4. The emergency mechanism includes the outlet branch pipe 14. The inlet end of the outlet branch pipe 14 is connected to the circulating hydrogen main pipe 10. The exhaust end of the outlet branch pipe 14 is connected to the sealing pipe 4. A shut-off valve 15, a basket filter 16, a shut-off valve II17, a pneumatic regulating valve I18, and a one-way valve II19 are installed sequentially along the gas flow direction on the outlet branch pipe 14.

[0023] The new hydrogen compressor 1 includes new hydrogen compressor I1-1 and new hydrogen compressor II1-2, and the buffer tank 2 includes buffer tank I2-1 and buffer tank II2-2. An exhaust pipe I23-1 is provided between new hydrogen compressor I1-1 and buffer tank I2-1, and an exhaust pipe II23-2 is provided between new hydrogen compressor II1-2 and buffer tank II2-2. The new hydrogen branch pipes 3 of buffer tank I2-1 and buffer tank II2-2 are respectively connected to the air inlet end of the sealing pipe 4.

[0024] Among them, shut-off valve I9, pressure transmitter I11, pressure transmitter II12, flow meter 13, shut-off valve 15, shut-off valve II17, pneumatic regulating valve I18, check valve III20, check valve IV22, shut-off valve I9 ​​and pneumatic regulating valve II24 are electrically connected to DCS.

[0025] During operation, start the new hydrogen compressor I1-1, new hydrogen compressor II1-2 and circulating hydrogen centrifugal compressor 5, open the shut-off valve I9, so that the high-purity hydrogen from the new hydrogen compressor I1-1 and new hydrogen compressor II1-2 enters the buffer tank I2-1 and buffer tank II2-2 respectively, and then merges into the sealing pipe 4 through the new hydrogen branch pipe 3. Then, it enters the cylinder high-pressure end inlet pipe 6 and cylinder low-pressure end inlet pipe 7 respectively through the sealing pipe 4 as the dry start sealing gas of the circulating hydrogen centrifugal compressor 5.

[0026] When the circulating hydrogen compressor 5 stops, the new hydrogen supply is cut off by remotely and quickly closing the shut-off valve I9 ​​via DCS.

[0027] When pressure transmitter I11 detects that the pressure of high-purity hydrogen in the sealing tube 4 is higher or lower than the preset value, the DCS remotely controls pneumatic regulating valve II24 to adjust the pressure of new hydrogen in the sealing tube 4; when pressure transmitter II12 detects that the pressure of circulating hydrogen in the circulating hydrogen main pipe 10 is higher or lower than the preset value, the DCS remotely controls pneumatic regulating valve I18 to adjust the pressure of circulating hydrogen in the outlet branch pipe 14.

[0028] When it is necessary to transport high-purity hydrogen to other devices, the one-way valve IV22 can be opened to transport high-purity hydrogen from the device-to-device pipe 21 to the target device.

Claims

1. A kind of circulating hydrogen centrifugal compressor cylinder body sealing anticorrosion device, comprising circulating hydrogen centrifugal compressor, it is characterized by: The application further comprises a new hydrogen compressor (1) and a buffer tank (2) communicated with the new hydrogen compressor (1), an outlet end of the buffer tank (2) is sequentially provided with a new hydrogen branch pipe (3) and a sealing pipe (4), a cylinder high pressure end gas inlet and a cylinder low pressure end gas inlet of a circulating hydrogen centrifugal compressor (5) are respectively provided with a cylinder high pressure end gas inlet pipe (6) and a cylinder low pressure end gas inlet pipe (7), the sealing pipe (4) is communicated with the cylinder high pressure end gas inlet pipe (6) and the cylinder low pressure end gas inlet pipe (7) respectively, the sealing pipe (4) is sequentially provided with a check valve I (8) and a cut-off valve I (9) along a gas flow direction, an exhaust end of the circulating hydrogen centrifugal compressor (5) is provided with a circulating hydrogen main pipe (10), and the cut-off valve I (9) is electrically connected with a DCS.

2. The corrosion protection device for the seal of the cylinder block of the centrifugal hydrogen compressor cycle according to claim 1, characterized in that: The sealing pipe (4) is provided with a pressure transmitter I (11), the circulating hydrogen main pipe (10) is provided with a pressure transmitter II (12), and the pressure transmitter I (11) and the pressure transmitter II (12) are electrically connected with the DCS respectively.

3. The corrosion protection device for the seal of the cylinder block of the centrifugal hydrogen compressor according to claim 1 or 2, characterized in that: The cylinder high pressure end gas inlet pipe (6) and the cylinder low pressure end gas inlet pipe (7) are respectively provided with a flowmeter (13), and the flowmeter (13) is electrically connected with the DCS respectively.

4. The corrosion protection device for the seal of the cylinder block of the centrifugal compressor of hydrogen circulation according to claim 3, characterized in that: An emergency mechanism is arranged between the circulating hydrogen main pipe (10) and the sealing pipe (4), the emergency mechanism comprises an exhaust branch pipe (14), an inlet end of the exhaust branch pipe (14) is communicated with the circulating hydrogen main pipe (10), an exhaust end of the exhaust branch pipe (14) is communicated with the sealing pipe (4), the exhaust branch pipe (14) is sequentially provided with a stop valve (15), a basket filter (16), a cut-off valve II (17), a pneumatic regulating valve I (18) and a check valve II (19) along a gas flow direction, a check valve III (20) is arranged between the pressure transmitter I (11) and the exhaust end of the exhaust branch pipe (14), and the stop valve (15), the cut-off valve II (17), the pneumatic regulating valve I (18) and the check valve III (20) are electrically connected with the DCS respectively.

5. The corrosion protection device for the seal of the cylinder block of the centrifugal compressor of hydrogen circulation according to claim 4, characterized in that: A removal device pipe (21) is arranged between the check valve I (8) of the sealing pipe (4) and an exhaust end of the new hydrogen branch pipe (3), the removal device pipe (21) is provided with a check valve IV (22), and the check valve IV (22) is electrically connected with the DCS.

6. The corrosion protection device for the seal of the cylinder block of the centrifugal compressor of hydrogen circulation according to claim 5, characterized in that: The new hydrogen compressor (1) comprises a new hydrogen compressor I (1-1) and a new hydrogen compressor II (1-2), the buffer tank (2) comprises a buffer tank I (2-1) and a buffer tank II (2-2), an exhaust pipe I (23-1) is arranged between the new hydrogen compressor I (1-1) and the buffer tank I (2-1) for communication, an exhaust pipe II (23-2) is arranged between the new hydrogen compressor II (1-2) and the buffer tank II (2-2) for communication, and the new hydrogen branch pipes (3) of the buffer tank I (2-1) and the buffer tank II (2-2) are respectively communicated with the inlet ends of the sealing pipes (4).

7. The corrosion protection device for the seal of the cylinder block of the centrifugal compressor of hydrogen circulation according to claim 6, characterized in that: A pneumatic regulating valve II (24) is arranged between the check valve I (8) and the cut-off valve I (9) of the sealing pipe (4), and the cut-off valve I (9) and the pneumatic regulating valve II (24) are electrically connected with the DCS respectively.

8. The corrosion protection device for the seal of the cylinder block of the centrifugal compressor of hydrogen circulation according to claim 7, characterized in that: The flowmeter (13) adopts a vortex flowmeter.

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