CN218117859U - Nitrogen gas gland sealing system suitable for back pressure steam turbine - Google Patents
Nitrogen gas gland sealing system suitable for back pressure steam turbine Download PDFInfo
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- CN218117859U CN218117859U CN202222160828.6U CN202222160828U CN218117859U CN 218117859 U CN218117859 U CN 218117859U CN 202222160828 U CN202222160828 U CN 202222160828U CN 218117859 U CN218117859 U CN 218117859U
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Abstract
The utility model discloses a nitrogen gas vapor seal system suitable for back pressure steam turbine, which comprises a front support bearing and a rear support bearing, wherein a main shaft passes through the front support bearing and then is connected with the rear support bearing; the main shaft is sleeved with a cylinder, the front end of the cylinder is provided with a front steam seal body, and the rear end of the cylinder is provided with a rear steam seal body; the front gland sealing body and the rear gland sealing body are respectively connected with a nitrogen charging device and a drain pipe. By means of the scheme, the unit is applied to a limited space factory building in a safe and stable mode, the existing shaft end steam sealing system guarantees leakage amount, high-temperature and high-pressure steam can be completely prevented from leaking to the bearing box, and the unit can run efficiently and stably.
Description
Technical Field
The utility model belongs to the technical field of steam turbine gland equipment, a nitrogen gas gland sealing system suitable for back pressure steam turbine is related to.
Background
The steam turbine is mainly to be with steam heat energy conversion mechanical energy, when the steam turbine operates, the rotor can high-speed rotatory, for preventing that rotor and other stator parts from taking place the interference, strong friction, need during the design at rotor and suitable clearance of design between the stator spare part of complex, because the existence in clearance can lead to high temperature high pressure steam in the steam turbine to reveal along steam turbine cylinder (stator) both ends, the high temperature steam who leaks gets into the bearing incasement portion around the steam turbine along the main shaft, thereby cause the lubricated oil emulsification of bearing, reduce the lubricity of bearing, bearing wearing and tearing volume has been increased, thereby arouse unit vibration anomaly, still can influence unit safe operation when wearing and tearing are serious, can arouse incident such as conflagration even.
The existing design of the shaft end steam seal system consisting of a shaft end steam seal, a steam seal cooling system, a steam seal steam extraction cooling system, a U-shaped water seal system, a pipeline, a valve and accessory equipment which are connected with the U-shaped water seal system can prevent high-temperature and high-pressure steam from leaking into a bearing box, but the existing shaft end steam seal system is large in occupied area, relatively complex in structure and high in cost, and cannot prevent the high-temperature and high-pressure steam from entering the bearing box in a factory building with limited space.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a nitrogen gas vapor seal system suitable for back pressure steam turbine has and prevents that high temperature high pressure steam from letting out vapour to the bearing box, makes the high-efficient steady operation's of unit characteristics.
The technical scheme adopted by the utility model is that the nitrogen gas steam seal system suitable for the back pressure turbine comprises a front support bearing and a rear support bearing, wherein a main shaft passes through the front support bearing and then is connected with the rear support bearing; the main shaft is sleeved with a cylinder, the front end of the cylinder is provided with a front gland sealing body, and the rear end of the cylinder is provided with a rear gland sealing body; the front steam seal body and the rear steam seal body are respectively connected with a nitrogen charging device and a drain pipe.
Furthermore, a plurality of concealable steam seal rings are arranged on the front steam seal body and the rear steam seal body, and 5-8 steam seal pieces are sequentially embedded on each steam seal ring; and the steam sealing sheet on the steam sealing ring and the steam sealing sheet on the main shaft are mutually staggered.
Furthermore, steam vents are arranged on the front steam seal body and the rear steam seal body at the standard atmospheric pressure with the air leakage pressure of 1.0-1.1 times, and the front steam seal body is provided with a front steam vent pipe connected with the steam vent at the top of the front steam seal body; the back gland casing is provided with a back gland pipe connected with a gland hole at the top of the back gland casing.
Furthermore, the end parts of the front steam seal body and the rear steam seal body are respectively provided with a nitrogen charging port, the nitrogen charging ports are positioned between the outermost steam seal ring and the secondary outer steam seal ring, and the nitrogen charging ports are connected with a nitrogen charging device.
Furthermore, the drain pipe is connected with the steam emitting holes at the bottoms of the front steam seal body and the rear steam seal body.
The utility model has the advantages that:
by means of the scheme, the unit is applied to a limited space factory building in a safe and stable mode, the existing shaft end steam sealing system guarantees leakage amount, high-temperature and high-pressure steam can be completely prevented from leaking to the bearing box, and the unit can run efficiently and stably. The cost of the whole set of equipment is saved, and a steam seal cooling system, a steam seal extraction cooling system and a water seal system occupy the space of a factory building.
Drawings
FIG. 1 is a schematic diagram of a nitrogen vapor seal system suitable for a back pressure turbine of the present invention;
FIG. 2 is a diagram of the installation layout of a nitrogen vapor seal system suitable for a back pressure turbine of the present invention;
figure 3 is a partial enlarged view of the nitrogen gland seal system suitable for a back pressure turbine.
In the figure, 1, a front gland casing, 2, a front steam emitting pipe, 3, a gland ring, 4, a cylinder, 5, a main shaft, 6, a gland sealing sheet, 7, a rear steam emitting pipe, 8, a rear gland casing, 9, a nitrogen charging device, 10, a front support bearing, 11, a rear support bearing, 12, a drain pipe and 13, a steam turbine.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a nitrogen gas gland sealing system suitable for a back pressure turbine comprises a front support bearing 10 and a rear support bearing 11, wherein a main shaft 5 passes through the front support bearing 10 and then is connected to the rear support bearing 11; the main shaft 5 is sleeved with a cylinder 4, the front end of the cylinder 4 is provided with a front gland sealing body 1, and the rear end of the cylinder 4 is provided with a rear gland sealing body 8; the front gland sealing body 1 and the rear gland sealing body 8 are respectively connected with a nitrogen charging device 9 and a drain pipe 12.
A plurality of yielding steam seal rings 3 are arranged on the front steam seal body 1 and the rear steam seal body 8, and 5-8 steam seal pieces 6 are sequentially embedded on each steam seal ring 3; and the steam seal sheet 6 on the steam seal ring 3 and the steam seal sheet 6 on the main shaft 5 are mutually staggered. Forming a continuous seal.
Steam emitting holes are arranged on the front steam seal body 1 and the rear steam seal body 8 at the standard atmospheric pressure with the leakage pressure of 1.0-1.1 times, and the front steam seal body 1 is provided with a front steam emitting pipe 2 connected with the steam emitting hole at the top of the front steam seal body 1; the rear gland sealing body 8 is provided with a rear steam emitting pipe 7 which is connected with a steam emitting hole at the top of the rear gland sealing body 8. The high-temperature and high-pressure steam is convenient to discharge.
The end parts of the front steam seal body 1 and the rear steam seal body 8 are respectively provided with a nitrogen charging port which is positioned between the outermost steam seal ring 3 and the secondary outer steam seal ring 3 and is connected with a nitrogen charging device 9. The design through hole is filled with micro-positive pressure nitrogen (the pressure is about 0.115-0.13 MPa) at a nitrogen source, and because the nitrogen is slightly higher than the atmospheric pressure (0.1 MPa) and the pressure (0.1 MPa) at a gas emitting pipe, nitrogen vapor resistance is effectively formed to prevent high-temperature high-pressure steam from leaking to a bearing box from a shaft end.
The drain pipe 12 is connected with the steam emitting holes at the bottoms of the front steam seal body 1 and the rear steam seal body 8.
The equipment is arranged in the following way: the steam turbine 13 is directly arranged on a concrete platform with 0m layer, and a nitrogen filling pipeline, a front steam emitting pipe 2 and a rear steam emitting pipe 7 are designed on a steam turbine 13 body and are connected through engineering pipelines. The micro-positive pressure nitrogen is added through the nitrogen filling pipeline, the pressure at the tail end of the steam seal is improved, and a steam resistance is formed.
The existing front and rear gland seals are lengthened (120-140 mm), the number of the gland rings 3 and the gland pieces 6 is increased by lengthening the length of the seal body, the steam leakage amount of the shaft end is reduced (the steam leakage amount is reduced by 10% -20%), meanwhile, the steam leakage amount (about 0.1% -0.5% of the total air inflow) is taken to be 1.0-1.1 times of the standard atmospheric pressure position to design a steam emitting hole through the calculation of the aerodynamic thermodynamic analysis, so that the leaked steam is discharged along the steam emitting hole, and the hot steam is prevented from flowing to the end bearing box along the main shaft 5.
Claims (5)
1. A nitrogen gas steam seal system suitable for a back pressure steam turbine is characterized by comprising a front support bearing (10) and a rear support bearing (11), wherein a main shaft (5) penetrates through the front support bearing (10) and then is connected with the rear support bearing (11); the main shaft (5) is sleeved with a cylinder (4), the front end of the cylinder (4) is provided with a front steam seal body (1), and the rear end of the cylinder (4) is provided with a rear steam seal body (8); the front steam seal body (1) and the rear steam seal body (8) are respectively connected with a nitrogen charging device (9) and a drain pipe (12).
2. The nitrogen gland sealing system suitable for the back pressure turbine according to claim 1, wherein a plurality of concealable gland sealing rings (3) are installed on the front gland sealing body (1) and the rear gland sealing body (8), and 5-8 gland sealing sheets (6) are sequentially embedded on each gland sealing ring (3); and the steam seal sheet (6) on the steam seal ring (3) is mutually staggered with the steam seal sheet (6) on the main shaft (5).
3. The nitrogen steam seal system suitable for the back pressure steam turbine is characterized in that steam emitting holes are formed in the front steam seal body (1) and the rear steam seal body (8) at the standard atmospheric pressure with the leakage pressure of 1.0-1.1 times, and the front steam seal body (1) is provided with a front steam emitting pipe (2) connected with the steam emitting holes in the top of the front steam seal body (1); the rear gland casing (8) is provided with a rear steam emitting pipe (7) which is connected with a steam emitting hole at the top of the rear gland casing (8).
4. The nitrogen steam seal system suitable for the back pressure steam turbine is characterized in that the ends of the front steam seal body (1) and the rear steam seal body (8) are respectively provided with a nitrogen charging port, the nitrogen charging ports are positioned between the outermost ring steam seal ring (3) and the second outer ring steam seal ring (3), and the nitrogen charging ports are connected with a nitrogen charging device (9).
5. A nitrogen gland seal system for a back pressure turbine according to claim 3 characterised in that the trap (12) connects the steam vents at the bottom of the front gland casing (1) and the rear gland casing (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222160828.6U CN218117859U (en) | 2022-08-17 | 2022-08-17 | Nitrogen gas gland sealing system suitable for back pressure steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222160828.6U CN218117859U (en) | 2022-08-17 | 2022-08-17 | Nitrogen gas gland sealing system suitable for back pressure steam turbine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218117859U true CN218117859U (en) | 2022-12-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222160828.6U Active CN218117859U (en) | 2022-08-17 | 2022-08-17 | Nitrogen gas gland sealing system suitable for back pressure steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218117859U (en) |
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2022
- 2022-08-17 CN CN202222160828.6U patent/CN218117859U/en active Active
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