CN210623566U - Dry gas sealing device of centrifugal compressor - Google Patents
Dry gas sealing device of centrifugal compressor Download PDFInfo
- Publication number
- CN210623566U CN210623566U CN201921274364.3U CN201921274364U CN210623566U CN 210623566 U CN210623566 U CN 210623566U CN 201921274364 U CN201921274364 U CN 201921274364U CN 210623566 U CN210623566 U CN 210623566U
- Authority
- CN
- China
- Prior art keywords
- dry gas
- gas
- pipeline
- centrifugal compressor
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The utility model relates to a centrifugal compressor's dry gas sealing device, including controller and the same dry gas seal unit of two sets of structures, every set of dry gas seal unit all includes: the system comprises a centrifugal compressor, a dry gas sealer, a nitrogen valve, a process gas control valve, a replacement pilot valve and an electric control valve; in each set of dry gas sealing unit: the centrifugal compressor is communicated with the dry gas sealer through a first pipeline, and a nitrogen valve is arranged on an air inlet pipeline of the dry gas sealer. The utility model discloses in reducing the sealed gas of nitrogen gas and entering into the system, ensure the process gas purity in the process system, obviously reduce the content of noncondensable gas to compression refrigerating system and more be superior to the system operation, reduce the pure loss of process gas, under the prerequisite that increases a small amount of investments, accomplish the sealed gas series connection between the dry gas seal unit, effectively solved the problem of system process gas purity, avoided the sealed gas problem of compressor at the start-stop in-process, reduced the start load of compressor.
Description
Technical Field
The utility model relates to a dry gas sealing device, concretely relates to centrifugal compressor's dry gas sealing device.
Background
The centrifugal compressor is widely applied to the field of petrochemical industry, and has the advantages of large gas treatment amount, low energy consumption, stable operation, long operation period and the like. Another main reason for the widespread use of centrifugal compressors is to achieve "zero leakage", which is a fundamental requirement for the unit when the process medium is toxic, harmful, or flammable and explosive, and the dry gas seal system is the main medium for achieving this.
The dry gas sealing system is based on a gas seal theory, utilizes a non-contact type gas film seal established by a gas dynamic pressure lubrication model, and a dry gas sealing unit is generally composed of a static ring which can axially float and a dynamic ring which is fixed on a shaft sleeve. The back of the static ring is provided with a spring for applying a joint acting force to the static ring, and the dynamic ring rotates at a high speed along with the rotor of the compressor. The primary reliance on sealing is the balance of hydrostatic and hydrodynamic pressures. The viscous shearing force generated by the high-speed rotating movable ring drives the gas to enter the hydrodynamic groove and move from the outer diameter to the center, the sealing dam provides flow resistance to prevent the gas from flowing to the low-pressure side, so that the gas is increased by the compression pressure, the sealing surfaces are separated, and a gas film with a certain thickness, generally 3 microns, is formed. When the static pressure of the fluid and the spring-loaded closing force are equal to the opening force developed in the gas film, a stable gap between the radial faces is formed, whereby the seal operates non-contact. The air film formed between the sealing surfaces has certain positive rigidity, ensures the stability of sealing operation, and simultaneously plays a role in lubricating a friction pair between the moving ring and the clean ring.
In order to ensure the operation safety of the dry gas sealing system, a two-stage series arrangement mode is adopted, wherein one stage is main sealing, and the second stage is standby sealing. Under normal working conditions, the first stage main seal bears all or most of load, the other stage does not bear or bears a small part of pressure drop, process gas leaked through the main seal is introduced into a torch for combustion, and residual extremely small amount of process gas leaks through the secondary seal and is introduced into a safety zone for emptying. The secondary seal may serve as a secondary safety feature when the primary seal fails.
The dry gas sealing system needs to adopt non-toxic or inert gas as sealing gas, most of the sealing gas of the main seal enters the unit along a shaft after entering a moving ring and a static ring, so that the purity of a medium in the system is reduced, and the content of effective gas is reduced. Before the start of the vehicle, the compressor unit does not operate, and the pressure cannot meet the requirement of a dry gas sealing system, so that the main sealing gas still needs to adopt nitrogen during the start of the vehicle, and the nitrogen is switched to process gas after the compressor unit operates normally.
In order to ensure that a dry gas sealing system is safer and more reliable and reduce the operation load of a main seal, a part of dry gas sealing devices are added with preposed isolation gas or buffer gas and sealed by utilizing the principle of gradual pressure reduction of comb teeth or labyrinth seals. Both the main seal gas and the pre-seal gas enter the process system, and the start load is increased in the starting process of the compressor.
Disclosure of Invention
In view of this, the utility model aims at providing a centrifugal compressor's dry gas sealing device, aim at solving at the compressor start-stop in-process, because of the process medium in the compressor can not satisfy the pressure requirement of main seal or leading isolation gas (or buffer gas), need adopt inert gas as the seal gas as nitrogen substitution process gas, at the in-process of driving, a large amount of seal gas enter into the unit, the load of driving the unit has been increased, the purity of system's medium has been reduced simultaneously, open for the unit and stop and bring very big potential safety hazard.
In order to achieve the purpose, the technical scheme is as follows:
the utility model provides a centrifugal compressor's dry gas sealing device, includes controller and two sets of dry gas seal units that the structure is the same, every set of dry gas seal unit all includes: the system comprises a centrifugal compressor, a dry gas sealer, a nitrogen valve, a process gas control valve, a replacement pilot valve and an electric control valve; wherein, in each set of dry gas seal unit: the centrifugal compressor is communicated with the dry gas sealer through a first pipeline, and a nitrogen valve is arranged on an air inlet pipeline of the dry gas sealer; in addition, two dry gas sealers in two sets of dry gas sealing units with the same structure are communicated through a communication pipeline and then are communicated in series, meanwhile, two electric control valves for respectively controlling the corresponding dry gas sealers in the two sets of dry gas sealing units are also arranged on the communication pipeline, a blind plate is arranged between the two electric control valves, a replacement guide shower valve is additionally arranged on the communication pipeline and is positioned on one side corresponding to the electric control valves; in addition, in each set of dry gas sealing unit: the centrifugal compressor is communicated with the communicating pipeline through a second pipeline, and a process air control valve is arranged on the second pipeline; the controller is connected with and controls the electric control valve and the opening and closing of the replacement pilot shower valve, and is used for introducing the replacement of the sealing gas in any one running dry gas sealing unit into another dry gas sealing unit to be started in a driving mode.
Furthermore, heat tracing devices are arranged on the first pipeline, the second pipeline and the communicating pipeline, so that the temperature of the medium is conveniently ensured.
Further, the dry gas sealer delivers the seal gas into the centrifugal compressor at a gas flow rate of not less than 5m/s to prevent the process gas from diffusing outward.
The utility model has the advantages that: the utility model discloses in having reduced the sealed gas of nitrogen gas and having entered into the system, ensured the process gas purity in the process system, obviously reduce the content of noncondensable gas to compression refrigerating system and more be superior to the system operation, reduce the pure loss of process gas, to the enterprise, under the prerequisite that increases a small amount of investment, accomplish the sealed gas series connection between the dry gas seal unit, effectively solved the problem of system process gas purity, avoided the sealed gas problem of compressor at the start-up and shutdown in-process, reduced the start-up load of compressor.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
fig. 1 is a schematic structural diagram of the present invention.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As shown in fig. 1, a dry gas sealing device of a centrifugal compressor includes a controller 1 and two sets of dry gas sealing units 2 with the same structure, where each set of dry gas sealing unit 2 includes: a centrifugal compressor 21, a dry gas sealer 22, a nitrogen gas valve 23, a process gas control valve 24, a replacement pilot valve 25 and an electric control valve 26; wherein, in each set of dry gas seal unit 2: the centrifugal compressor 21 is communicated with a dry gas sealer 22 through a first pipeline 3, and a nitrogen valve 23 is arranged on an air inlet pipeline 4 of the dry gas sealer 22; in addition, two dry gas sealers 22 in two sets of dry gas sealing units 2 with the same structure are communicated through a communication pipeline 5 and then the two sets of dry gas sealing units 2 are communicated in series, meanwhile, two electric control valves 26 for respectively controlling the corresponding dry gas sealers 22 in the two sets of dry gas sealing units 2 are further arranged on the communication pipeline 5, a blind plate 6 is arranged between the two electric control valves 26, a replacement pilot valve 25 is further additionally arranged on the communication pipeline 5, and the replacement pilot valve 25 is positioned on one side of the replacement pilot valve 25 corresponding to the electric control valves 26; in addition, in each set of dry gas seal unit 2: the centrifugal compressor 21 is communicated with the communication pipeline 5 through a second pipeline 7, and a process control valve 24 is arranged on the second pipeline 7; the controller 1 is connected with and controls the opening and closing of the electric control valve 26 and the replacement pilot shower valve 25, and is used for introducing the sealing gas replacement in any one running dry gas sealing unit 2 into another dry gas sealing unit 2 to be started;
the first pipeline 3, the second pipeline 7 and the communicating pipeline 5 are all provided with heat tracing devices to ensure the temperature of the medium conveniently, the air flow velocity of the sealing air conveyed into the centrifugal compressor 21 by the dry air sealer 22 is not less than 5m/s to prevent the process air from diffusing outwards, so as to prevent the process air from diffusing outwards and ensure the sealing effect.
The utility model discloses a work flow: before starting, confirming that each control point and each valve of each dry gas sealing unit 2 are in a closed state, closing a nitrogen valve 23 and a process gas control valve 24, conducting a blind plate 6, after opening an electric control valve 26, carrying out process gas replacement through a replacement guide shower valve 25, analyzing indexes such as process gas dew point and oxygen content and the like in a required range, opening each control point of each dry gas sealing unit 2, gradually introducing the process gas of the running unit into a dry gas sealing control system for starting, strictly monitoring the temperature and pressure of the sealing gas, strictly forbidding the sealing gas carrying liquid, and starting the centrifugal compressor 21 when each index meets requirements.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (3)
1. The dry gas sealing device of the centrifugal compressor is characterized by comprising a controller and two sets of dry gas sealing units with the same structure, wherein each set of dry gas sealing unit comprises: the system comprises a centrifugal compressor, a dry gas sealer, a nitrogen valve, a process gas control valve, a replacement pilot valve and an electric control valve; wherein, in each set of dry gas seal unit: the centrifugal compressor is communicated with the dry gas sealer through a first pipeline, and a nitrogen valve is arranged on an air inlet pipeline of the dry gas sealer;
in addition, two dry gas sealers in two sets of dry gas sealing units with the same structure are communicated through a communication pipeline and then are communicated in series, meanwhile, two electric control valves for respectively controlling the corresponding dry gas sealers in the two sets of dry gas sealing units are also arranged on the communication pipeline, a blind plate is arranged between the two electric control valves, a replacement guide shower valve is additionally arranged on the communication pipeline and is positioned on one side corresponding to the electric control valves;
in addition, in each set of dry gas sealing unit: the centrifugal compressor is communicated with the communicating pipeline through a second pipeline, and a process air control valve is arranged on the second pipeline;
the controller is connected with and controls the electric control valve and the opening and closing of the replacement pilot shower valve, and is used for introducing the replacement of the sealing gas in any one running dry gas sealing unit into another dry gas sealing unit to be started in a driving mode.
2. The dry gas sealing device of a centrifugal compressor according to claim 1, wherein the first pipeline, the second pipeline and the communicating pipeline are provided with heat tracing devices to ensure the temperature of the medium.
3. The dry gas seal arrangement of a centrifugal compressor as claimed in claim 1, wherein the dry gas seal delivers a seal gas into the centrifugal compressor at a gas flow rate of not less than 5 m/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921274364.3U CN210623566U (en) | 2019-08-07 | 2019-08-07 | Dry gas sealing device of centrifugal compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921274364.3U CN210623566U (en) | 2019-08-07 | 2019-08-07 | Dry gas sealing device of centrifugal compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210623566U true CN210623566U (en) | 2020-05-26 |
Family
ID=70753092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921274364.3U Active CN210623566U (en) | 2019-08-07 | 2019-08-07 | Dry gas sealing device of centrifugal compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210623566U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112902022A (en) * | 2021-02-23 | 2021-06-04 | 浙江华泓新材料有限公司 | Product gas compressor system |
| CN113756882A (en) * | 2021-09-30 | 2021-12-07 | 宁夏宝丰能源集团股份有限公司 | Dry gas sealing system of synthesis gas compressor |
-
2019
- 2019-08-07 CN CN201921274364.3U patent/CN210623566U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112902022A (en) * | 2021-02-23 | 2021-06-04 | 浙江华泓新材料有限公司 | Product gas compressor system |
| CN113756882A (en) * | 2021-09-30 | 2021-12-07 | 宁夏宝丰能源集团股份有限公司 | Dry gas sealing system of synthesis gas compressor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210623566U (en) | Dry gas sealing device of centrifugal compressor | |
| CN103836196B (en) | A kind of rotating speed self-adapting intelligent type hydrodynamic mechanical seal device | |
| BR0008357A (en) | Lubrication and sealing method and apparatus for windings and gears | |
| CN202666722U (en) | Pipeline type high-shear emulsifying machine | |
| US20170234332A1 (en) | Auxiliary shaft seal flushing system of a centrifugal pump and an axial flow pump | |
| CN109826960A (en) | A kind of axial multilayer runner superposition reflux pumping mechanical seal structure | |
| CN203702642U (en) | Low-temperature large-shaft-diameter dry gas sealing device for centrifugal compressor | |
| US3904333A (en) | Pressure balancing system for gear pumps or motors | |
| CN2534428Y (en) | Single-row cross fluid dynamic pressure tank upstream pumping mechanical seal | |
| Cao et al. | Failure analysis and transformation of hydrogen compressor dry gas seal | |
| CN209115755U (en) | A kind of fire prevention emergency shutoff device | |
| CN202811475U (en) | Sealing device applied to low temperature centrifugal liquid pump | |
| US3895890A (en) | Geared hydraulic apparatus | |
| CN106704372B (en) | Hydraulic suspension high thrust bearing | |
| CN211116764U (en) | Dry air sealing device for compressor | |
| CN206958262U (en) | A kind of ripple spring mechanical seal | |
| CN2208627Y (en) | Gas membrane float-ring oil sealing for air compressor | |
| CN204114167U (en) | Reduction valve | |
| CN210890112U (en) | Dry gas sealing device | |
| CN219062437U (en) | Shaft end sealing structure suitable for gas working medium rotary machine | |
| CN209705276U (en) | A kind of axial multilayer runner superposition reflux pumping mechanical seal structure | |
| CN206988424U (en) | Through-flow machine main shaft sealing construction | |
| CN102661287A (en) | Fireproof and leakproof system for high-temperature centrifugal pump | |
| CN208221601U (en) | A kind of dry gas seals buffering gas monitor controller | |
| CN221033263U (en) | Dry gas sealing device of centrifugal compressor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |