CN113586170A - Dry gas sealing device for shaft end of supercritical carbon dioxide turbine equipment - Google Patents
Dry gas sealing device for shaft end of supercritical carbon dioxide turbine equipment Download PDFInfo
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- CN113586170A CN113586170A CN202111035261.3A CN202111035261A CN113586170A CN 113586170 A CN113586170 A CN 113586170A CN 202111035261 A CN202111035261 A CN 202111035261A CN 113586170 A CN113586170 A CN 113586170A
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- ring
- shaft
- dry gas
- sealing
- carbon dioxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
- F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
- F01D11/04—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type using sealing fluid, e.g. steam
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
A dry gas sealing device for supercritical carbon dioxide turbine equipment axle head. The existing dry gas seal keeps the sealing state by the balance of elasticity and the pressure of a medium film between a moving ring and a static ring, but when a spring fails, the balance state is broken, so that the sealing effect is lost. The invention comprises the following components: the shaft sealing device comprises a shaft (1), a shaft shell (2), a sealing head (3), a static ring (6), a dynamic ring (10), an elastic device (11) and a fixed seat (12); the shaft shell is fixed with the end socket, a plurality of static ring control rods are inserted on the circumferential surface of the shaft shell, and the static ring control rods are fixed on the static ring; the movable ring is sleeved on the shaft and sealed with the shaft through an elastic sealing ring, and a main sealing surface between the movable ring and the static ring is formed; the movable ring is connected with the fixed seat on the shaft through an elastic device. The dry gas seal device is used for dry gas seal of the shaft end of the supercritical carbon dioxide turbine equipment.
Description
Technical Field
The present invention relates to supercritical carbon dioxide (S-CO)2) The technical field of safety of turbine equipment in a Brayton cycle power generation system, and particularly relates to a dry gas sealing device for a shaft end of supercritical carbon dioxide turbine equipment.
Background
Supercritical carbon dioxide (S-CO)2) Compared with steam Rankine cycle, the Brayton cycle has the advantages of easy reaching of a critical state, compact cycle system, high cycle efficiency, high cycle flexibility and the like, and opens up a new field for future energy utilization. Supercritical carbon dioxide (S-CO)2) The circulation flow is CO2The heat of a heat source is absorbed, steam is generated to drive a turbine, and then heat-power conversion is completed through heat regeneration, cooling and compression.
The turbine equipment is used as important power equipment in a circulating system, and in a high-parameter circulating system, the turbine equipment is designed into a large axial flow type, so that the sealing performance of the shaft end of the turbine equipment has a great influence on the pneumatic efficiency of the system. The end sealing of the axial-flow turbine equipment is dynamic sealing, the most advanced dynamic sealing device at present is dry gas sealing, the dry gas sealing is non-contact end face sealing, and the axial-flow turbine equipment is widely applied to the fields of petroleum, chemical industry and the like due to the advantages of long service life, low power consumption and the like.
The existing dry gas seal is kept in a sealing state by balancing elastic force and medium film pressure between a moving ring and a static ring, but when a spring fails, the balance state is broken, so that the sealing effect is lost, and only the machine is stopped. In addition, the carbon dioxide is supercritical carbon dioxide (S-C)O2) The working medium has the physical characteristics of high density and low viscosity, and when the pressure balance state of the sealing end surface is unstable and leakage is generated, whether new pressure balance can be generated quickly by an elastic device of the dry gas seal can not be ensured.
Disclosure of Invention
The invention aims to provide a dry gas sealing device for a shaft end of a supercritical carbon dioxide turbine device.
The above purpose is realized by the following technical scheme:
a dry gas seal device for the shaft end of a supercritical carbon dioxide turbine device comprises the following components: the shaft, the shaft shell, the seal head, the static ring, the dynamic ring, the elastic device and the fixed seat;
the shaft shell is fixed with the end socket, a plurality of static ring control rods are inserted on the circumferential surface of the shaft shell, and the static ring control rods are fixed on the static ring;
the movable ring is sleeved on the shaft and sealed with the shaft through an elastic sealing ring, and a main sealing surface between the movable ring and the static ring is formed;
the movable ring is connected with the fixed seat on the shaft through an elastic device.
The dry gas sealing device for the shaft end of the supercritical carbon dioxide turbine equipment is characterized in that the static ring and the end socket are sealed through an elastic sealing ring.
The dry gas sealing device for the shaft end of the supercritical carbon dioxide turbine equipment is characterized in that the shaft shell and the end socket are sealed through an elastic sealing ring.
The dry gas sealing device for the shaft end of the supercritical carbon dioxide turbine equipment is characterized in that four static ring control rods are arranged.
Has the advantages that:
1. the movable ring of the invention rotates along with the shaft, the static ring is fixed by the static ring control rod, and two ends of the elastic device are respectively connected with the fixed seat and the movable ring. When the spring force of the elastic device and the medium pressure between the end faces of the movable ring and the static ring reach a stable equilibrium state, a rigid medium film is formed between the movable ring and the static ring to generate a sealing effect. The elastic device can control the brake ring to make axial displacement so as to ensure the stable state of the medium film between the end faces of the dynamic and static rings when the pressure in the turbine changes.
2. When the elastic device in the dry gas seal fails due to faults or when the pressure in the turbine far exceeds the normal working pressure, the axial movement of the movable ring can not ensure the tightness of the main seal surface, and at the moment, an emergency system of the dry gas seal needs to be started, namely, a static ring control rod is manually operated outside the turbine to enable the static ring to move along the axial direction, the thickness of a medium film between the main seal surfaces is controlled, and the leakage is prevented.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of the present invention;
in the figure: 1. a shaft; 2. a shaft housing; 3. sealing the end; 4. 7, 9, an elastic sealing ring; 5. a stationary ring control lever; 6. a stationary ring; 8. A main sealing surface between the dynamic ring and the static ring; 10. A moving ring; 11. an elastic device; 12. a fixed seat.
The specific implementation mode is as follows:
example 1:
a dry gas seal device for the shaft end of a supercritical carbon dioxide turbine device comprises the following components: the shaft, the shaft shell, the seal head, the static ring, the dynamic ring, the elastic device and the fixed seat;
the shaft shell is fixed with the end socket, a plurality of static ring control rods are inserted on the circumferential surface of the shaft shell, and the static ring control rods are fixed on the static ring;
the movable ring is sleeved on the shaft and sealed with the shaft through an elastic sealing ring, and a main sealing surface between the movable ring and the static ring is formed;
the movable ring is connected with the fixed seat on the shaft through an elastic device.
Example 2:
according to the dry gas sealing device for the shaft end of the supercritical carbon dioxide turbine equipment in the embodiment 1, the static ring and the seal head are sealed through the elastic sealing ring.
Example 3:
according to the dry gas sealing device for the shaft end of the supercritical carbon dioxide turbine equipment in the embodiment 1 or 2, the shaft shell and the end socket are sealed through the elastic sealing ring.
Example 4:
the dry gas sealing device for the shaft end of the supercritical carbon dioxide turbine equipment according to the embodiment 1, the embodiment 2 or the embodiment 3 is characterized in that the number of the static ring control rods is four.
The device has 4 seals: dynamic sealing (8) between the end faces of the moving ring and the static ring; static seal (4) between the end socket and the shaft housing; a static seal (7) between the static ring and the end socket; a static seal (9) between the rotating ring and the shaft. Wherein, the dynamic seal (8) between the end faces of the moving ring and the static ring is a main seal, and the rest 3 parts are secondary seals.
When the dry air sealing device is in a normal working state, the movable ring (10) rotates along with the shaft (1), the static ring (6) is fixed by the static ring control rod (5), and two ends of the elastic device (11) are respectively connected with the fixed seat (12) and the movable ring (10). When the spring force of the elastic device and the medium pressure between the end faces of the movable ring and the static ring reach a stable equilibrium state, a rigid medium film is formed between the movable ring and the static ring to generate a sealing effect. The elastic device (11) can control the brake ring (10) to make axial displacement so as to ensure the stable state of the medium film between the end faces of the dynamic and static rings when the pressure in the turbine changes.
When an elastic device in the dry gas seal fails due to faults or when the pressure in the turbine far exceeds the normal working pressure, the movable ring (10) moves axially to ensure the tightness of the main sealing surface (8), and at the moment, an emergency system of the dry gas seal needs to be started, namely the static ring control rod (5) is manually operated outside the turbine to enable the static ring (6) to move axially, so that the thickness of a medium film between the main sealing surfaces (8) is controlled, and the leakage is prevented.
Claims (4)
1. A dry gas sealing device for a shaft end of supercritical carbon dioxide turbine equipment is characterized in that: the composition comprises: the shaft, the shaft shell, the seal head, the static ring, the dynamic ring, the elastic device and the fixed seat;
the shaft shell is fixed with the end socket, a plurality of static ring control rods are inserted on the circumferential surface of the shaft shell, and the static ring control rods are fixed on the static ring;
the movable ring is sleeved on the shaft and sealed with the shaft through an elastic sealing ring, and a main sealing surface between the movable ring and the static ring is formed;
the movable ring is connected with the fixed seat on the shaft through an elastic device.
2. The dry gas seal device for an axial end of a supercritical carbon dioxide turbine apparatus as claimed in claim 1, wherein: the static ring and the end socket are sealed through an elastic sealing ring.
3. The dry gas seal device for an axial end of a supercritical carbon dioxide turbine apparatus as claimed in claim 2, wherein: the shaft shell and the end socket are sealed through an elastic sealing ring.
4. The dry gas seal device for an axial end of a supercritical carbon dioxide turbine apparatus as claimed in claim 3, wherein: the number of the static ring control rods is four.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111035261.3A CN113586170A (en) | 2021-09-05 | 2021-09-05 | Dry gas sealing device for shaft end of supercritical carbon dioxide turbine equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111035261.3A CN113586170A (en) | 2021-09-05 | 2021-09-05 | Dry gas sealing device for shaft end of supercritical carbon dioxide turbine equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113586170A true CN113586170A (en) | 2021-11-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111035261.3A Pending CN113586170A (en) | 2021-09-05 | 2021-09-05 | Dry gas sealing device for shaft end of supercritical carbon dioxide turbine equipment |
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| CN (1) | CN113586170A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117469370A (en) * | 2023-12-27 | 2024-01-30 | 中国核动力研究设计院 | Dry gas sealing device free of isolation gas |
-
2021
- 2021-09-05 CN CN202111035261.3A patent/CN113586170A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117469370A (en) * | 2023-12-27 | 2024-01-30 | 中国核动力研究设计院 | Dry gas sealing device free of isolation gas |
| CN117469370B (en) * | 2023-12-27 | 2024-03-08 | 中国核动力研究设计院 | Dry gas sealing device free of isolation gas |
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