CN214788173U - Dry gas sealing device of centrifugal propylene refrigeration compressor - Google Patents
Dry gas sealing device of centrifugal propylene refrigeration compressor Download PDFInfo
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- CN214788173U CN214788173U CN202120606224.2U CN202120606224U CN214788173U CN 214788173 U CN214788173 U CN 214788173U CN 202120606224 U CN202120606224 U CN 202120606224U CN 214788173 U CN214788173 U CN 214788173U
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Abstract
The utility model discloses a dry gas sealing device of a centrifugal propylene refrigeration compressor, which comprises a propylene storage tank, a propylene vaporizer, a centrifugal propylene refrigeration compressor and a dry gas seal thereof, wherein liquid phase propylene from the propylene storage tank is vaporized by the propylene vaporizer to be used as a sealing gas to replace low-pressure nitrogen gas to be used as the sealing gas, and the liquid phase propylene is controlled by a pressure difference control regulating valve to enter the compressor for primary sealing; a process gas pipeline is led out from the outlet end of the centrifugal propylene refrigeration compressor, and after passing through the two-stage filter, gas in the pipeline enters the sealing cavity as buffer gas for dry gas sealing. The utility model discloses a device is through changing once sealed gas process medium, provides the gaseous phase propylene of sufficient pressure and flow as sealed gas, satisfies the compressor start-up demand.
Description
Technical Field
The utility model belongs to the technical field of the compressor is sealed, a centrifugal compressor's sealing device is related to, concretely relates to centrifugal propylene refrigeration compressor dry gas sealing device.
Background
The centrifugal compressor is a device commonly used in the petrochemical industry, and in order to reduce the air leakage of a gap between a compressor rotor and a fixed element and fully prevent the air leakage or limit the air leakage along the axial direction, various shaft end sealing methods are required to be selected to maintain the normal operation of the centrifugal compressor, so that the accident potential hazards of harming human bodies and equipment safety are reduced or eliminated, the pollution is prevented, and the consumption is reduced. Four common sealing modes of the centrifugal compressor are mechanical sealing, labyrinth sealing, dry gas sealing and floating ring sealing.
Dry gas seals, or "Dry Running gas seals", are a new type of shaft end seal that uses a grooved sealing technique for gas sealing, and belong to the non-contact seals. When the movable ring with the hydrodynamic groove arranged on the outer side of the end face rotates, the hydrodynamic groove pumps high-pressure isolation gas on the outer diameter side into the space between the sealing end faces, the pressure of a gas film is gradually increased from the outer diameter to the groove diameter, the pressure of the gas film is gradually decreased from the groove diameter to the inner diameter, the opening force formed due to the increase of the pressure of the film on the end face is larger than the closing force acting on the sealing ring, and a thin layer of gas film is formed between the friction pairs, so that the sealing work is in a non-contact state. The gas film formed completely blocks the relatively low-pressure sealing medium leakage path, and zero leakage or zero escape of the sealing medium is realized. The existence of the air film not only effectively separates the end faces but also cools the two end faces which run oppositely, and the two end faces are not in contact, so that the friction and the abrasion are greatly reduced, and the seal has the characteristic of long service life.
The refrigeration medium used by the propylene refrigeration compressor is polymerization-grade propylene, according to the refrigeration cycle process of compression → condensation → decompression → evaporation, the gas-phase propylene is pressurized to 1.593MPa (g) by the refrigeration compressor, the gas-phase propylene is condensed into liquid-phase propylene by using cooling water, the temperature is controlled to be about 40 ℃, then according to the throttling and expansion principle, the liquid-phase propylene is reduced from the condensation pressure to the evaporation pressure by a throttling valve, and the heat of a condensed substance is evaporated and absorbed in a user heat exchanger, namely refrigeration, the refrigeration is continuously circulated, thereby achieving the purpose of refrigeration. The propylene refrigeration compressor can provide four temperature levels of refrigerant: the temperature of-41 ℃, 24.6 ℃, 9.1 ℃ and 4.9 ℃ provide enough cold energy of various grades for the olefin separation and rectification tower. The existing dry gas sealing system of the centrifugal propylene refrigeration compressor utilizes low-pressure nitrogen as a gas source, and a booster pump is used for boosting and then sending the boosted dry gas to the dry gas sealing system to be used as sealing gas.
Disclosure of Invention
An object of the utility model is to provide a centrifugal propylene refrigeration compressor does gas sealing device, through changing once sealed gas medium and process condition, change sealed gas medium and be gaseous phase propylene, provide the gaseous phase propylene of sufficient pressure and flow as sealed gas, the device provide more stable sealed gas.
In order to realize the purpose of the invention, the utility model adopts the technical scheme that:
a dry gas sealing device of a centrifugal propylene refrigeration compressor comprises the centrifugal propylene refrigeration compressor and a dry gas seal thereof, and is characterized by also comprising a propylene storage tank and a propylene vaporizer, wherein liquid-phase propylene from the propylene storage tank enters the propylene vaporizer for vaporization, and the generated propylene gas enters a primary sealing gas pipeline of the dry gas seal; a process gas pipeline is led out from the outlet end of the centrifugal propylene refrigeration compressor, and after passing through the two-stage filter, gas in the pipeline enters the sealing cavity as buffer gas for dry gas sealing.
Furthermore, a pressure regulating valve is arranged at the outlet of the propylene vaporizer, so that the pressure of the supplied sealing gas is stable.
Furthermore, a pressure difference control regulating valve is arranged on the primary sealing gas pipeline.
Preferably, the filter has a filtering accuracy of 3 μm.
Has the advantages that: the utility model discloses a centrifugal propylene compressor dry gas sealing device through changing once sealed gas process medium and process condition, changes sealed gas medium and is gaseous phase propylene, with having had the sealed gas that propylene gasification provided the sealed gas that satisfies the dry gas seal condition, the sealed gas that provides is more stable to guarantee that centrifugal propylene compressor can normally steadily start.
Drawings
FIG. 1 is a schematic structural view of a dry gas sealing device of a centrifugal propylene refrigeration compressor of the present invention;
wherein, the 1-propylene refrigeration compressor; 2-a propylene storage tank; 3-propylene vaporizer; 4-pressure regulating valve; 5-differential pressure control regulating valve.
Detailed Description
The following detailed description of the embodiments of the present invention is provided, but it should be noted that the scope of the present invention is not limited by the embodiments, but is defined by the appended claims.
As shown in figure 1, the utility model discloses a centrifugal propylene refrigeration compressor dry gas sealing device, including centrifugal propylene refrigeration compressor 1 and dry gas seal to and propylene storage tank 2 and propylene vaporizer 3, the export of propylene vaporizer 3 sets up pressure regulating valve 4, and the liquid phase propylene that comes from propylene storage tank 2 gets into the gasification of propylene vaporizer 3, and the propylene gas of production gets into the sealed gas pipeline of a time of dry gas seal through the pipeline.
At present, a dry gas sealing system of a centrifugal propylene refrigeration compressor utilizes low-pressure nitrogen (LPN) as a gas source, and a booster pump is used for boosting and then sending the gas to the dry gas sealing system to be used as sealing gas. The utility model discloses a change once sealed gas medium and process condition, change sealed gas medium and be gaseous phase propylene, utilize the last differential pressure control governing valve 5(PDV) control of sealed gas pipeline to get into the compressor once sealed. The dry gas sealing device leads out a process gas from the outlet end of the compressor unit, and the process gas passes through a two-stage filter (the filtering precision is 3 mu m) to become dry and clean gas which is used as buffer gas for dry gas sealing and enters a sealing cavity. The normal operation is controlled to be slightly higher than the reference gas pipe process gas pressure (usually 50KPa) in the normal operation, and the function of the control valve is to prevent impurities such as dust, condensate and the like in the unpurified process gas from entering the sealing end face to generate adverse influence on the normal operation of the dry gas sealing. The system measures the differential pressure between the buffer gas and the reference gas by a differential pressure transmitter, and the signal controls a pneumatic membrane regulating valve arranged at the inlet of the buffer gas through electrical conversion so as to regulate the inlet pressure of the buffer gas to maintain the constant differential pressure with the reference gas. Most of the buffer gas entering the seal cavity returns to the process gas through the comb teeth seal. The remaining small portion leaks out through the end face of the first stage dry gas seal, referred to as the first stage leak gas, the majority of which is directed to a flare for safe combustion.
Claims (4)
1. A dry gas sealing device of a centrifugal propylene refrigeration compressor comprises the centrifugal propylene refrigeration compressor and a dry gas seal thereof, and is characterized by also comprising a propylene storage tank and a propylene vaporizer, wherein liquid-phase propylene from the propylene storage tank enters the propylene vaporizer for vaporization, and the generated propylene gas enters a primary sealing gas pipeline of the dry gas seal; a process gas pipeline is led out from the outlet end of the centrifugal propylene refrigeration compressor, and after passing through a two-stage filter, gas in the pipeline enters a sealing cavity as buffer gas for dry gas sealing.
2. The dry gas seal device of a centrifugal propylene refrigeration compressor according to claim 1, wherein the outlet of the propylene vaporizer is provided with a pressure regulating valve.
3. The dry gas seal device for a centrifugal propylene refrigeration compressor according to claim 1, wherein a differential pressure control regulating valve is arranged on the primary seal gas pipeline.
4. The dry gas seal device of a centrifugal propylene refrigeration compressor according to claim 1, wherein the filter has a filtration precision of 3 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120606224.2U CN214788173U (en) | 2021-03-25 | 2021-03-25 | Dry gas sealing device of centrifugal propylene refrigeration compressor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120606224.2U CN214788173U (en) | 2021-03-25 | 2021-03-25 | Dry gas sealing device of centrifugal propylene refrigeration compressor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214788173U true CN214788173U (en) | 2021-11-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120606224.2U Active CN214788173U (en) | 2021-03-25 | 2021-03-25 | Dry gas sealing device of centrifugal propylene refrigeration compressor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214788173U (en) |
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2021
- 2021-03-25 CN CN202120606224.2U patent/CN214788173U/en active Active
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