CN216008610U - Steam turbine low pressure bearing seal temperature reducing device - Google Patents
Steam turbine low pressure bearing seal temperature reducing device Download PDFInfo
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- CN216008610U CN216008610U CN202122256498.6U CN202122256498U CN216008610U CN 216008610 U CN216008610 U CN 216008610U CN 202122256498 U CN202122256498 U CN 202122256498U CN 216008610 U CN216008610 U CN 216008610U
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- temperature reduction
- temperature reducing
- reducing device
- shaft seal
- reduction device
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Abstract
The utility model discloses a steam turbine low pressure bearing seal attemperator belongs to bearing seal and supplies vapour technical field. The single-nozzle atomization temperature reduction device comprises a pressure equalizing box, a pipeline, a temperature reduction water main pipe, a water pneumatic control valve, a bypass door, a rear shaft seal temperature reduction water filter screen, a single-nozzle atomization temperature reduction device, a stop valve, a rear shaft seal and a steam inlet electric door, wherein a flute-shaped insertion type temperature reduction device is arranged on one side of the single-nozzle atomization temperature reduction device, the flute-shaped insertion type temperature reduction device comprises a second temperature reduction device and a second isolation valve, the single-nozzle atomization temperature reduction device comprises a first temperature reduction device and a first isolation valve, and two small holes are formed in the first temperature reduction device and the second temperature reduction device. Through providing a steam turbine low pressure bearing seal attemperator, can realize one and use one and reserve, eliminated the attemperation water nozzle and blockked up and influence the hidden danger that the unit area load incident takes place, improved the reliability of system, and construction convenience, popularization nature is strong, can be applicable to most steam turbine units.
Description
Technical Field
The utility model relates to a steam turbine low pressure bearing seal attemperator belongs to bearing seal steam supply system technical field.
Background
The shaft seal system is an important thermodynamic system in a steam turbine generator set, and a low-pressure shaft seal of the shaft seal system is sealed by means of externally supplied shaft seal steam, so that air is prevented from entering a low-pressure cylinder of the steam turbine, and the condenser is guaranteed to have sufficient vacuum.
The safety and the economical efficiency of the unit are directly influenced by the high and low and stable steam supply temperature of the shaft seal, and the low-pressure shaft seal temperature reducing device is used for controlling the steam supply of the low-pressure shaft seal within a proper temperature range. The nozzle of the low-pressure shaft seal temperature reducing device of the common steam turbine is a single-nozzle atomization nozzle, and the temperature reducing water is led from an outlet pipeline of a condensate pump, passes through a filter screen and is used for cooling shaft seal steam entering the low-pressure shaft seal through the atomization nozzle.
The nozzle of the common turbine low-pressure shaft seal temperature reducing device is a single-nozzle atomizing nozzle, and because of the aging and corrosion of equipment, the long-term operation of the turbine low-pressure shaft seal temperature reducing water nozzle of a unit turbine has a blocking risk in operation, the reliability of the equipment is poor, and once the nozzle is blocked, the steam temperature of the low-pressure shaft seal cannot be controlled, and the load operation of the unit can be influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in:
the utility model provides a steam turbine low pressure bearing seal temperature reducing device, it has solved among the prior art long-term unit steam turbine low pressure bearing seal temperature reducing water nozzle that operates and can have the jam easily in the operation, causes the uncontrollable problem of low pressure bearing seal steam temperature, influence unit load operation.
The utility model discloses the technical problem that will solve takes following technical scheme to realize:
a low-pressure shaft seal temperature reducing device of a steam turbine comprises a pressure equalizing box, a pipeline, a temperature reducing water main pipe, a water pneumatic control valve, a bypass door, a rear shaft seal temperature reducing water filter screen, a single-nozzle atomization temperature reducing device, a stop valve, a rear shaft seal and a steam inlet electric door, wherein a flute-shaped plug-in type temperature reducing device is arranged on one side of the single-nozzle atomization temperature reducing device and comprises a second temperature reducer and a second isolation valve;
the single-nozzle atomization temperature reducing device comprises a first temperature reducer and a first isolating valve, and the flute-shaped plug-in type temperature reducing device and the single-nozzle atomization temperature reducing device are installed in parallel;
the first desuperheater and the second desuperheater are both provided with two small holes;
stop valves are arranged on two sides of the water pneumatic control valve and the rear shaft seal temperature-reducing water filter screen, and bypass valves are arranged on one sides of the water pneumatic control valve and the rear shaft seal temperature-reducing water filter screen in parallel.
As a preferred example, the diameter of the orifices in the first and second desuperheaters are each 1 mm.
As a preferred example, the first and second isolation valves are ball valves of DN 15.
The utility model has the advantages that:
1. through the design of the two low-pressure shaft seal temperature reducing devices of the single-nozzle atomization temperature reducing device and the flute-shaped plug-in type temperature reducing device, one-purpose and one-standby can be realized, the hidden danger that the load-bearing event of the unit is influenced due to the blockage of the temperature reducing water nozzle is eliminated, the reliability of the system is improved, the construction is convenient, the popularization is strong, and the device can be suitable for most steam turbine units.
2. Two small holes of 1mm are formed in the first desuperheater and the second desuperheater, so that the purpose of desuperheating can be achieved.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of a single-nozzle atomization temperature reduction device and a stop valve.
In the figure: 1. a pressure equalizing box; 2. a pipeline; 21. a rear shaft seal; 22. a water pneumatic damper; 23. a rear shaft seal temperature-reducing water filter screen; 24. an air inlet electric door; 3. a temperature-reducing water main pipe; 4. a bypass gate; 5. a single-nozzle atomization desuperheating device; 51. a first desuperheater; 52. a first isolation valve; 6. a stop valve; 61. a first valve; 62. a second valve; 63. a third valve; 64. a fourth valve; 65. a fifth valve; 66. a sixth valve; 7. a flute-shaped plug-in type temperature reducing device; 71. a second desuperheater; 72. a second isolation valve.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the functions of the present invention easy to understand and understand, the present invention is further explained by combining the following specific drawings.
As shown in fig. 1-2, a low-pressure shaft seal temperature reduction device for a steam turbine comprises a pressure equalizing box 1, a pipeline 2, a temperature reduction water main pipe 3, a water pneumatic control door 22, a bypass door 4, a rear shaft seal temperature reduction water filter screen 23, a single-nozzle atomization temperature reduction device 5, a stop valve 6, a rear shaft seal 21 and an air inlet electric door 24.
The temperature-reducing water main pipe 3 comprises two pipes which are respectively arranged at two ends of the pipeline 2.
The stop valve 6 includes a first valve 61, a second valve 62, a third valve 63, a fourth valve 64, a fifth valve 65, and a sixth valve 66.
The water pneumatic control valve 22 is arranged at one end close to the temperature-reducing water main pipe 3, and a first bypass valve 4 and a second bypass valve 4 are respectively arranged in parallel at one side of the water pneumatic control valve 22 and one side of the temperature-reducing water filter of the rear shaft seal 21.
The first valve 61 and the second valve 62 are respectively arranged at two sides of the water pneumatic control valve 22, the fourth valve 64 and the fifth valve 65 are respectively arranged at two sides of the rear shaft seal temperature-reducing water filter screen 23, the third valve 63 is arranged on the first bypass valve 4, and the sixth valve 66 is arranged on the second bypass valve 4.
One side of the single-nozzle atomization temperature reducing device 5 is provided with a flute-shaped plug-in type temperature reducing device 7, and the flute-shaped plug-in type temperature reducing device 7 comprises a second temperature reducer 71 and a second isolating valve 72.
The single-nozzle atomization temperature reducing device 5 comprises a first temperature reducing device 51 and a first isolating valve 52, a flute-shaped plug-in type temperature reducing device 7 and the single-nozzle atomization temperature reducing device 5 are installed in parallel and are arranged in a countercurrent mode, and two small holes with the diameter of 1mm are formed in the first temperature reducing device 51 and the second temperature reducing device 71 to meet the temperature reducing requirement.
The steam inlet electric door 24 is arranged between the second desuperheater 71 and the pressure equalizing box 1.
The pressure equalizing box 1 mainly functions in collecting, distributing and equalizing steam pressure and is set up for a steam seal. The steam source connected into the box body and leaking into the box body is expanded and decompressed uniformly, the steam with the pressure and the temperature required by opening the front shaft seal is adjusted to be 2.94-29.4KPa and the temperature is 120-140 ℃, steam is supplied to the front shaft seal 21 and the rear shaft seal 21 before opening the machine, the steam leaking from the front shaft seal can supplement the steam source of the rear shaft seal 21 during normal operation, and simultaneously the high-pressure side steam leaking from a water control check valve for low-pressure steam extraction can be collected to prevent the low-pressure section shaft seal from sucking air inwards to influence vacuum, and the high-temperature shaft seal steam is supplied to the front shaft seal 21 and the rear shaft seal 21 during thermal state starting.
Near one end of the first desuperheater 51 is a rear shaft seal 21.
The shaft seal is a friction seal or stuffing box used for preventing liquid leakage between a shaft and a bearing of a compressor or other fluid conveying equipment and is a sealing device arranged for preventing leakage between a pump shaft and a shell. Common forms of shaft seals are packing seals, mechanical seals and dynamic seals.
The working principle is as follows: the newly added flute-shaped plug-in type temperature reducing device 7 is installed in parallel with the original single-nozzle atomization temperature reducing device 5 to be used as a standby of the single-nozzle atomization temperature reducing device 5, the first isolation valve 52 and the second isolation valve 72 are installed respectively, the original single-nozzle atomization temperature reducing device 5 is still used in normal operation, when the original single-nozzle atomization temperature reducing device 5 is blocked, the first isolation valve 52 is closed, the second isolation valve 72 is opened, and the operation is switched to the flute-shaped plug-in type temperature reducing device 7 to ensure the safe operation of the unit.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above-described embodiments, and that various changes and modifications may be made without departing from the spirit and scope of the invention, and such changes and modifications are intended to be included within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. A low-pressure shaft seal temperature reducing device of a steam turbine comprises a pressure equalizing box (1), a pipeline (2), a temperature reducing water main pipe (3), a water pneumatic control valve (22), a bypass door (4), a rear shaft seal temperature reducing water filter screen (23), a single-nozzle atomization temperature reducing device (5), a stop valve (6), a rear shaft seal (21) and a steam inlet electric door (24), and is characterized in that a flute-shaped plug-in type temperature reducing device (7) is arranged on one side of the single-nozzle atomization temperature reducing device (5), and the flute-shaped plug-in type temperature reducing device (7) comprises a second temperature reducing device (71) and a second isolating valve (72);
the single-nozzle atomization temperature reducing device (5) comprises a first temperature reducing device (51) and a first isolating valve (52), and the flute-shaped plug-in type temperature reducing device (7) and the single-nozzle atomization temperature reducing device (5) are installed in parallel;
the first desuperheater (51) and the second desuperheater (71) are both provided with two small holes;
both sides of the water pneumatic control door (22) and the rear shaft seal temperature-reducing water filter screen (23) are respectively provided with a stop valve (6), and one sides of the water pneumatic control door (22) and the rear shaft seal temperature-reducing water filter screen (23) are respectively connected in parallel with a bypass door (4).
2. The turbine low pressure shaft seal desuperheating device of claim 1 wherein the diameter of the apertures of said first desuperheater (51) and said second desuperheater (71) are each 1 mm.
3. The steam turbine low pressure shaft seal desuperheating device of claim 1 wherein said first isolation valve (52) and second isolation valve (72) are ball valves of DN 15.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122256498.6U CN216008610U (en) | 2021-09-17 | 2021-09-17 | Steam turbine low pressure bearing seal temperature reducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122256498.6U CN216008610U (en) | 2021-09-17 | 2021-09-17 | Steam turbine low pressure bearing seal temperature reducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216008610U true CN216008610U (en) | 2022-03-11 |
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ID=80591140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122256498.6U Active CN216008610U (en) | 2021-09-17 | 2021-09-17 | Steam turbine low pressure bearing seal temperature reducing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216008610U (en) |
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2021
- 2021-09-17 CN CN202122256498.6U patent/CN216008610U/en active Active
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