CN110332017B - Self-adaptive shaft seal steam supply system - Google Patents
Self-adaptive shaft seal steam supply system Download PDFInfo
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- CN110332017B CN110332017B CN201910729582.XA CN201910729582A CN110332017B CN 110332017 B CN110332017 B CN 110332017B CN 201910729582 A CN201910729582 A CN 201910729582A CN 110332017 B CN110332017 B CN 110332017B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 230000001105 regulatory effect Effects 0.000 claims description 28
- 239000007921 spray Substances 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 230000003044 adaptive effect Effects 0.000 claims 4
- 238000005507 spraying Methods 0.000 claims 1
- 241000283216 Phocidae Species 0.000 abstract description 195
- 230000008646 thermal stress Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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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- 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
- F01D11/06—Control thereof
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
The invention discloses a self-adaptive shaft seal steam supply system which comprises a shaft seal main pipe, a door rod air leakage adjusting steam supply branch, an overflow branch, a bypass pneumatic branch, a high-pressure cylinder shaft seal, a middle-pressure cylinder shaft seal and a low-pressure cylinder shaft seal. According to the self-adaptive shaft seal steam supply system provided by the invention, when the unit is started, after steam supply fails, the pressure difference between two sides of the steam leakage check valve is increased, and the differential pressure transmitter closes the valve rod to leak gas to adjust the steam supply branch adjusting valve, so that steam supply interruption is prevented; when the self sealss operating mode, the bearing seal supplies vapour pressure to increase, and differential pressure transmitter opens door lever gas leakage and adjusts and supply vapour branch road governing valve, prevents that the bearing seal supplies vapour pipeline superpressure, adjusts steam temperature through supplementary steam control valve, increases the security and the anti fault capability of this system.
Description
Technical Field
The invention relates to the technical field of steam turbine equipment, in particular to a self-adaptive shaft seal steam supply system.
Background
The supercritical unit usually adopts a high-medium pressure cylinder separating structure, particularly adopts a medium-pressure single-flow separating design unit, when the rotor temperature difference at the front shaft seal and the rear shaft seal of the high-pressure cylinder and the intermediate-pressure cylinder is very large in operation, the rotor temperature at the front shaft seal of the high-pressure cylinder and the front shaft seal of the intermediate-pressure cylinder is higher, while the rotor temperature at the rear shaft seal of the high-pressure cylinder and the rear shaft seal of the intermediate-pressure cylinder is lower, in order to avoid overlarge thermal stress of the shaft diameter during hot-state and extremely hot-state starting, the steam sending temperature of the shaft seal should be matched with the rotor temperature, otherwise, the service life of the rotor is influenced, and the large shaft is more likely to be locked.
The shaft seal steam supply of the power plant usually adopts auxiliary steam as a shaft seal steam supply source, can meet the steam supply temperature requirements of starting the rear shaft seal of the high pressure cylinder and the rear shaft seal of the intermediate pressure cylinder in a thermal state and an extreme thermal state, but can not meet the high-temperature steam supply requirements of the high-pressure cylinder front shaft seal and the medium-pressure cylinder front shaft seal, when the conventional unit is started in a hot state or an extremely hot state, the steam supply of the main steam station is mainly relied on, or the electric heater is added at the auxiliary steam station to provide a high-temperature steam source, although the system is simple, but only one steam supply temperature can be provided for each steam seal of the high and medium pressure cylinders, and the independent temperature matching can not be carried out on the front shaft seal of the high and medium pressure cylinders and the rear shaft seal of the high and medium pressure cylinders, according to the conventional scheme of supplying steam at the main steam station or adding an electric heater at the auxiliary steam station, the problem that the steam supply temperature of the shaft seal is not matched with the temperature of the rotor is still outstanding, and the problem that the temperature of the rotor is matched with the temperature of the steam supply of the shaft seal cannot be solved fundamentally.
Therefore, how to avoid the excessive thermal stress of the shaft diameter is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
The invention aims to provide a self-adaptive shaft seal steam supply system which can avoid overlarge thermal stress of the shaft diameter, prevent a large shaft from being locked and reduce the service life loss of a rotor.
In order to solve the technical problem, the invention provides a self-adaptive shaft seal steam supply system which comprises a shaft seal main pipe, a door lever air leakage adjusting steam supply branch, an overflow branch, a bypass pneumatic branch, a high-pressure cylinder shaft seal, a middle-pressure cylinder shaft seal and a low-pressure cylinder shaft seal.
Preferably, the shaft seal device further comprises a water spray desuperheater, and the water spray desuperheater is arranged on the shaft seal main pipe branch.
Preferably, a water spray regulating valve is arranged on a water supply pipeline of the water spray desuperheater.
Preferably, a safety valve is arranged on the shaft seal mother pipe.
Preferably, an overflow valve is arranged on the shaft seal main pipe.
Preferably, a bypass pneumatic valve is arranged on the bypass pneumatic branch.
Preferably, the shaft seal device further comprises a gas leakage check valve, and the high-pressure cylinder shaft seal and the intermediate-pressure cylinder shaft seal are both communicated with the shaft seal main pipe through the gas leakage check valve.
Preferably, the system further comprises a differential pressure transmitter arranged on the valve rod air leakage adjusting steam supply branch, and the differential pressure transmitter interlocks the opening and closing of the bypass pneumatic valve.
Preferably, the shaft seal cooling device is communicated with a leakage main pipe of the low-pressure cylinder shaft seal.
Preferably, at least one shaft exhaust fan is arranged on the shaft seal cooler.
The invention provides a self-adaptive shaft seal steam supply system which mainly comprises a shaft seal main pipe, a door lever air leakage adjusting steam supply branch, an overflow branch, a bypass pneumatic branch, a high-pressure cylinder shaft seal, a medium-pressure cylinder shaft seal and a low-pressure cylinder shaft seal. According to the self-adaptive shaft seal steam supply system provided by the invention, when the unit is started, after the auxiliary steam supply is jammed due to failure, the pressure difference between two sides of the auxiliary steam supply steam leakage check valve is increased, and the differential pressure transmitter sends a signal to close the regulating valve of the steam supply branch adjusted by the air leakage of the door lever, so that the steam supply is prevented from being interrupted, and cold air leaks into the cylinder; when self sealss operating mode, when the bearing seal supplies vapour pressure to increase, differential pressure transmitter sends the signal and opens the governing valve that the door lever gas leakage adjusted and supplied vapour branch road, prevents that the bearing seal supplies vapour pipeline superpressure, increases the security and the anti fault capability of this system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.
Wherein, in fig. 1:
the system comprises a main shaft seal pipe-1, a door lever air leakage adjusting steam supply branch-2, an overflow branch-3, a bypass pneumatic branch-4, a high-pressure cylinder shaft seal-5, a middle-pressure cylinder shaft seal-6, a low-pressure cylinder shaft seal-7, a water spray desuperheater-8, an auxiliary steam regulating valve-9, a safety valve-10, an air leakage check valve-11, a differential pressure transmitter-12, an overflow valve-13 and a shaft seal cooler-14.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 1, fig. 1 is a schematic overall structure diagram of an embodiment of the present invention.
In a specific embodiment provided by the invention, the self-adaptive shaft seal steam supply system mainly comprises a shaft seal main pipe 1, a door rod air leakage adjusting steam supply branch 2, an overflow branch 3, a bypass pneumatic branch 4, a high pressure cylinder shaft seal 5, an intermediate pressure cylinder shaft seal 6 and a low pressure cylinder shaft seal 7, wherein an auxiliary steam regulating valve 9 is arranged at the inlet end of the shaft seal main pipe 1, the inlet end of the shaft seal main pipe 1 is respectively communicated with the door rod air leakage adjusting steam supply branch 2, the overflow branch 3 and the bypass pneumatic branch 4 so as to communicate the shaft seal main pipe 1 with an auxiliary steam station, and the outlet end of the shaft seal main pipe 1 is respectively communicated with a rear shaft seal of the high pressure cylinder shaft seal 5 and a rear shaft seal of the intermediate pressure cylinder shaft seal 6.
The inlet end of the main shaft seal pipe 1 is provided with an auxiliary steam regulating valve 9, the auxiliary steam regulating valve 9 is used for regulating the temperature of steam introduced from an auxiliary steam station, the inlet end of the main shaft seal pipe 1 is respectively regulated with the air leakage of a door lever to supply a steam branch 2, the overflow branch 3 is communicated with a bypass pneumatic branch 4, the air leakage of the door lever is regulated to supply the steam branch 2, the overflow branch 3 and the bypass pneumatic branch 4 are used for completing the temperature and the pressure of the steam introduced into the auxiliary steam station under different starting conditions of the unit, the steam inlet of the main shaft seal pipe 1 is disconnected and communicated with the auxiliary steam station, and the steam outlet end of the main shaft seal pipe 1 is respectively communicated with a rear shaft seal of a high-pressure cylinder shaft seal 5 and a rear shaft seal of an intermediate-pressure cylinder shaft seal 6.
In the actual operation process of the unit, when the unit is in a cold starting working condition, auxiliary steam is used for setting the pressure and the temperature of the steam in the main shaft seal pipe 1 through the auxiliary steam regulating valve 9 and then directly supplying the steam to the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6, at the moment, the steam turbine is opened in a cold state, the temperature of the low-pressure cylinder shaft seal 7 is lower, the steam temperature is reduced to the temperature required by the low-pressure cylinder shaft seal 7 through the water spray desuperheater 8 and then supplied to the low-pressure cylinder shaft seal 7, and the safety valve and the overflow valve are standby to fulfill the steam demand on the unit.
When the unit is in a thermal state and an extreme thermal state shutdown working condition, due to the operating working condition of the unit, the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6 are both in a high-temperature state, at the moment, the door rod air leakage adjusting steam supply branch 2 ensures that the intermediate-pressure main steam door, the intermediate-pressure regulating door, the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6 are isolated from cold air and cold water, the phenomenon that a large shaft is locked due to the meeting of the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6 with the cold air and the cold water is avoided, after the problem is solved, the unit is started under the thermal state and extreme thermal state working conditions, at the moment, the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6 cannot be reduced or are reduced little, the door rod air leakage adjusting steam supply branch 2 to the main pipe 1 directly supplies steam to the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6, and the steam turbine is in a thermal state and interlocks the auxiliary steam regulating valve 9 and the bypass pneumatic branch 4 to set pressure, the steam supply temperature is reduced to the temperature required by the low-pressure cylinder shaft seal 7 through the water spray desuperheater 8, then the steam is supplied to the low-pressure cylinder shaft seal 7, and the safety valve 10 and the overflow branch 3 are reserved.
When the unit is in a deep peak regulation self-sealing working condition, the auxiliary steam regulating valve 9 is closed, the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6 are in a steam leakage state, steam leakage of the door rod air leakage regulating steam supply branch 2, the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6 is transmitted to the shaft seal main pipe 1 through the steam leakage check valve 11, the differential pressure transmitter 12 monitors the steam leakage pressure difference, the regulating valve of the door rod air leakage regulating steam supply branch 2 is interlocked to be opened, the steam supply temperature is reduced to the temperature required by the low-pressure cylinder shaft seal 7 through the water spray desuperheater 8, then the low-pressure cylinder shaft seal 7 is supplied with steam, and the safety valve 10 and the overflow branch 3 are reserved.
When the unit is in a self-sealing working condition, the auxiliary steam regulating valve 9 is closed, the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6 are in a steam leakage state, steam leakage of the front shaft seal of the high-pressure cylinder shaft seal 5 and the front shaft seal of the intermediate-pressure cylinder shaft seal 6 is transmitted to the main shaft seal pipe 1 through the steam leakage check valve 11, the differential pressure transmitter 12 monitors the steam leakage pressure difference, the regulating valve of the steam supply branch pipe 2 is opened through air leakage regulation of the interlocking door lever, the steam supply temperature is reduced to the temperature required by the low-pressure cylinder shaft seal 7 through the water spray desuperheater 8, then steam is supplied to the low-pressure cylinder shaft seal 7, the overflow valve 13 is opened, steam in the main shaft seal pipe 1 is set to a set value, and the safety valve 10 is used for standby.
In order to optimize the advantage that the self-adaptive shaft seal steam supply system in the above embodiment can preferably perform steam on the unit, the self-adaptive shaft seal steam supply system further comprises a water spray desuperheater 8, and the water spray desuperheater 8 is arranged on a branch of the communication between the shaft seal main pipe 1 and the low-pressure cylinder shaft seal 7. Because of the instability of the unit, the unit can be started under different working conditions, for example, the unit is started under a cold starting working condition, auxiliary steam is used for setting the pressure and the temperature of the steam in the main shaft seal pipe 1 through the auxiliary steam regulating valve 9 and then directly supplying the steam to the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6, at the moment, the steam turbine is opened in a cold state, the temperature of the low-pressure cylinder shaft seal 7 is lower, the steam temperature is reduced to the temperature required by the low-pressure cylinder shaft seal 7 through the water spray desuperheater 8 and then supplied to the low-pressure cylinder shaft seal 7, and the safety valve and the overflow valve are in standby use to meet the steam requirement of the unit; for example, the unit is in a thermal state and an extreme thermal state shutdown condition, due to the operating condition of the unit, the high pressure cylinder shaft seal 5 and the intermediate pressure cylinder shaft seal 6 are both in a high temperature state, at this time, the door rod air leakage adjusting steam supply branch 2 ensures that the intermediate pressure main steam door, the intermediate pressure regulating door, the high pressure cylinder shaft seal 5 and the intermediate pressure cylinder shaft seal 6 are isolated from cold air and cold water, so as to avoid the large shaft locking caused by the meeting of the high pressure cylinder shaft seal 5 and the intermediate pressure cylinder shaft seal 6 with the cold air and the cold water, after the problem is solved, the unit is started in the thermal state and extreme thermal state condition, at this time, the high pressure cylinder shaft seal 5 and the intermediate pressure cylinder shaft seal 6 are not reduced or are reduced little, the door rod air leakage adjusting steam supply branch 2 to the main pipe 1 directly supplies steam to the high pressure cylinder shaft seal 5 and the intermediate pressure cylinder shaft seal 6, at this time, the steam turbine is in the thermal state and interlocks the auxiliary steam regulating valve 9 and the bypass pneumatic branch 4 to set pressure, the steam supply temperature is reduced to the temperature required by the low-pressure cylinder shaft seal 7 through the water spray desuperheater 8, then the steam is supplied to the low-pressure cylinder shaft seal 7, the safety valve 10 and the overflow branch 3 are standby, the steam supply branch 2 is adjusted through the air leakage of the door lever to supply steam to the front shaft seal of the high-pressure cylinder shaft seal 5, the front shaft seal of the intermediate-pressure cylinder shaft seal 6, the rear shaft seal of the high-pressure cylinder shaft seal 5 and the rear shaft seal of the intermediate-pressure cylinder shaft seal 6 to carry out independent temperature matching, and the steam of a low-temperature ground can be provided for the low-pressure cylinder shaft seal 7 through the water spray desuperheater 8, so that the excessive thermal stress of the shaft diameter is avoided, the locking of a large shaft is prevented, and the service life loss of a rotor is reduced.
Further, a water spray regulating valve is provided on a water supply pipeline of the water spray desuperheater 8. Because the operating condition of unit is different, divide into multiple operation and start-up condition, so, high pressure cylinder bearing seal 5, the temperature difference of intermediate pressure cylinder bearing seal 6 and low pressure cylinder bearing seal 7, it has low to have high, consequently, when satisfying high pressure cylinder bearing seal 5, the temperature demand of intermediate pressure cylinder bearing seal 6 and low pressure cylinder bearing seal 7, add the water spray governing valve on the supply pipeline of water spray desuperheater 8, the temperature control range that can make steam is more extensive, satisfy high pressure cylinder bearing seal 5 better, the temperature demand of intermediate pressure cylinder bearing seal 6 and low pressure cylinder bearing seal 7.
Further, a safety valve is arranged on the shaft seal main pipe 1; an overflow valve is arranged on the shaft seal main pipe 1. The pressure and temperature control of the shaft seal system are automatic control, the system provides shaft seal steam for a host and a water supply pump turbine, the system is provided with a shaft seal pressure automatic adjusting device, an overflow pressure relief device and a shaft seal air exhaust device, a permanent steam filter is arranged at a shaft seal steam inlet, the shaft seal steam system comprises an electric isolation valve for switching a shaft seal steam source, a pressure reducing valve, a bypass valve, a pressure relief valve, other valves, instruments, temperature reducing equipment, relevant auxiliary equipment and the like, the system steam supply main pipe 1 is also provided with a safety valve 10, the pressure of the steam in the steam supply main pipe 1 can be adjusted through the safety valve 10, the efficiency of adjusting the steam pressure of the steam supply main pipe 1 is improved, and the situation that the safety of a unit is threatened due to overhigh steam supply pressure can be prevented.
Further, a bypass pneumatic valve is arranged on the bypass pneumatic branch 4. The bypass pneumatic valve of the bypass pneumatic branch 4 can assist in adjusting the pressure of steam inside the shaft seal main pipe 1, the pressure of the steam inside the shaft seal main pipe 1 can be adjusted as required, the stability of the steam pressure inside the shaft seal main pipe 1 is improved, and the unit is guaranteed to operate safely and stably.
Further, the self-adaptive shaft seal steam supply system further comprises a gas leakage check valve 11, and the door rod gas leakage, the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6 are communicated with the shaft seal main pipe 1 through the gas leakage check valve. For example, under the unit self-sealing working condition, the auxiliary steam regulating valve 9 is closed, the high-pressure cylinder shaft seal 5 and the intermediate-pressure cylinder shaft seal 6 are in a steam leakage state, steam leakage of the front shaft seal of the high-pressure cylinder shaft seal 5 and the front shaft seal of the intermediate-pressure cylinder shaft seal 6 is transmitted to the shaft seal main pipe 1 through the steam leakage check valve 11, the differential pressure transmitter 12 monitors the steam leakage pressure difference, the regulating valve of the steam supply branch 2 is adjusted to be opened through air leakage of the interlocking door lever, the steam supply temperature is reduced to the temperature required by the low-pressure cylinder shaft seal 7 through the water spray desuperheater 8, then steam is supplied to the low-pressure cylinder shaft seal 7, the overflow valve 13 is opened, steam in the shaft seal main pipe 1 is set to a set value, and the safety valve 10 is used for standby. The setting of gas leakage check valve 11 can make the unit when self sealss operating mode, avoids revealing of high pressure cylinder bearing seal 5, 6 steam of intermediate pressure cylinder bearing seal, makes steam return shaft seal female pipe 1, has saved the unit and has restarted the renewed demand of steam, reduces unit running cost.
Further, the self-adaptive shaft seal steam supply system further comprises a differential pressure transmitter 8 arranged on the valve rod air leakage adjusting steam supply branch 2, and the differential pressure transmitter 8 interlocks the opening and closing of the bypass pneumatic valve. For example, the unit is in a thermal state and an extreme thermal state shutdown condition, due to the operating condition of the unit, the high pressure cylinder shaft seal 5 and the intermediate pressure cylinder shaft seal 6 are both in a high temperature state, at this time, the door rod air leakage adjusting steam supply branch 2 ensures that the intermediate pressure main steam door, the intermediate pressure adjusting door, the high pressure cylinder shaft seal 5 and the intermediate pressure cylinder shaft seal 6 are isolated from cold air and cold water, so as to avoid the phenomenon that a big shaft is locked due to the meeting of the high pressure cylinder shaft seal 5 and the intermediate pressure cylinder shaft seal 6 with the cold air and the cold water, after the problem is solved, the unit is started under the thermal state and extreme thermal state conditions, at this time, the high pressure cylinder shaft seal 5 and the intermediate pressure cylinder shaft seal 6 are not reduced or are reduced little, the door rod air leakage adjusting steam supply branch 2 to the main pipe 1 directly supplies steam to the high pressure cylinder shaft seal 5 and the intermediate pressure cylinder shaft seal 6, at this time, the steam turbine is in a thermal state and interlocks the auxiliary steam adjusting valve 9 and the bypass pneumatic branch 4 to set pressure, the steam supply temperature is reduced to the temperature required by the low-pressure cylinder shaft seal 7 through the water spray desuperheater 8, then the steam is supplied to the low-pressure cylinder shaft seal 7, and the safety valve 10 and the overflow branch 3 are reserved. Differential pressure transmitter 8's setting has improved the regulation efficiency of the female pipe 1 inside steam pressure of bearing seal, and the steam pressure difference that detects through differential pressure transmitter 8 feeds back control system, carries out timely regulation, improves the efficiency of adjusting the female pipe 1 steam pressure of bearing seal, can prevent to supply steam pressure too high and endanger unit safety.
Further, the self-adaptive shaft seal steam supply system also comprises a shaft seal cooler 14 communicated with a gas leakage main pipe of the low-pressure cylinder shaft seal 7; at least one shaft exhaust fan is arranged on the shaft seal cooler 14. In addition, a shaft seal steam cooler with 100% of capacity and two shaft-adding fans with 100% of capacity are arranged for discharging non-condensable gas in the shaft seal steam cooler, and the two electric exhaust fans are mutually standby, so that the guarantee of safe and stable operation of the unit is improved.
To sum up, the self-adaptation bearing seal steam supply system that this embodiment provided mainly includes the shaft seal mother pipe, the door lever leaks gas and adjusts the steam supply branch road, the overflow branch road, the pneumatic branch road of bypass, high pressure cylinder bearing seal, intermediate pressure cylinder bearing seal and low pressure cylinder bearing seal, the entry end of the shaft seal mother pipe is provided with supplementary steam control valve, and the entry end of the shaft seal mother pipe respectively with the door lever leaks gas and adjusts the steam supply branch road, overflow branch road and the pneumatic branch road intercommunication of bypass to supply the shaft seal mother pipe and supplementary steam station intercommunication, the exit end of the shaft seal mother pipe respectively with the back bearing seal of high pressure cylinder bearing seal, the back bearing seal intercommunication of intermediate pressure cylinder bearing seal. According to the self-adaptive shaft seal steam supply system provided by the invention, when the unit is started, after the auxiliary steam supply is jammed due to failure, the pressure difference between two sides of the auxiliary steam supply steam leakage check valve is increased, and the differential pressure transmitter sends a signal to close the regulating valve of the steam supply branch adjusted by the air leakage of the door lever, so that the steam supply is prevented from being interrupted, and cold air leaks into the cylinder; when self sealss operating mode, when the bearing seal supplies vapour pressure to increase, differential pressure transmitter sends the signal and opens the governing valve that the door lever gas leakage adjusted and supplied vapour branch road, prevents that the bearing seal supplies vapour pipeline superpressure, increases the security and the anti fault capability of this system. The steam seal system can automatically switch from the start of the unit to the full-load operation according to the steam supply requirement of the steam seal of the unit in the whole process; the self-sealing steam seal system has the advantages of simplicity, safety, reliability, good working condition adaptability and the like.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A self-adaptive shaft seal steam supply system is characterized by comprising a shaft seal main pipe (1), a door lever air leakage adjusting steam supply branch (2), an overflow branch (3), a bypass pneumatic branch (4), a high-pressure cylinder shaft seal (5), a middle-pressure cylinder shaft seal (6) and a low-pressure cylinder shaft seal (7), wherein an auxiliary steam regulating valve (9) is arranged at the inlet end of the shaft seal main pipe (1), the inlet end of the shaft seal main pipe (1) is respectively communicated with the door lever air leakage adjusting steam supply branch (2), the overflow branch (3) and the bypass pneumatic branch (4) so as to communicate the main pipe (1) with an auxiliary steam station, and the outlet end of the shaft seal main pipe (1) is respectively communicated with a rear shaft seal of the high-pressure cylinder (5) and a rear shaft seal of the middle-pressure cylinder (6); the steam valve is characterized by further comprising a differential pressure transmitter (12) arranged on the valve rod air leakage adjusting steam supply branch (2), a bypass pneumatic valve is arranged on the bypass pneumatic branch (4), the differential pressure transmitter (12) interlocks the opening and closing of the bypass pneumatic valve, and a water spraying desuperheater (8) is arranged on a branch of the shaft seal main pipe (1);
when the unit is in a thermal state or an extreme thermal state shutdown working condition, the door rod air leakage adjusting steam supply branch (2) is used for ensuring that a medium-pressure main valve, a medium-pressure adjusting valve, the high-pressure cylinder shaft seal (5) and the medium-pressure cylinder shaft seal (6) are isolated from cold air and cold water;
when the unit is in a hot state and an extremely hot state starting working condition, the door lever air leakage adjusting steam supply branch (2) and the shaft seal main pipe (1) are used for directly supplying steam to the high-pressure cylinder shaft seal (5) and the intermediate-pressure cylinder shaft seal (6);
when the unit is in a deep peak regulation self-sealing working condition, the differential pressure transmitter (12) interlocks the valve rod to leak gas to regulate the regulating valve of the steam supply branch (2) to be opened, and supplies steam to the low-pressure cylinder shaft seal (7) after the temperature of supplied gas is reduced by the water spray desuperheater (8).
2. The adaptive shaft seal steam supply system according to claim 1, characterized in that a water spray regulating valve is arranged on a water supply pipeline of the water spray desuperheater (8).
3. The adaptive shaft seal steam supply system according to claim 1, characterized in that a safety valve (10) is arranged on the shaft seal main pipe (1).
4. The self-adaptive shaft seal steam supply system according to claim 3, characterized in that an overflow valve (13) is arranged on the shaft seal main pipe (1).
5. The self-adaptive shaft seal steam supply system according to claim 1, further comprising a gas leakage check valve, wherein the high-pressure cylinder shaft seal (5) and the intermediate-pressure cylinder shaft seal (6) are both communicated with the shaft seal main pipe (1) through the gas leakage check valve.
6. The adaptive shaft seal steam supply system according to claim 1, further comprising a shaft seal cooler (14) in communication with a blow-by main of the low pressure cylinder shaft seal (7).
7. The adaptive shaft seal steam supply system according to claim 6 wherein said shaft seal cooler is provided with at least one shaft aspirator.
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| CN201910729582.XA CN110332017B (en) | 2019-08-08 | 2019-08-08 | Self-adaptive shaft seal steam supply system |
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| CN201910729582.XA CN110332017B (en) | 2019-08-08 | 2019-08-08 | Self-adaptive shaft seal steam supply system |
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| CN110332017A CN110332017A (en) | 2019-10-15 |
| CN110332017B true CN110332017B (en) | 2022-04-22 |
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| CN112576377B (en) * | 2020-12-07 | 2022-04-01 | 中国航发沈阳发动机研究所 | Aeroengine bearing seals bleed structure |
| CN114687814A (en) * | 2020-12-25 | 2022-07-01 | 上海电气电站设备有限公司 | Steam seal cooler device |
| CN112855942B (en) * | 2020-12-28 | 2022-04-12 | 东方电气集团东方汽轮机有限公司 | Shaft end sealing system of closed type circulating rotating machine |
| CN112879111A (en) * | 2021-01-19 | 2021-06-01 | 北京龙威发电技术有限公司 | Steam seal leakage cooling system of supercritical back pressure steam turbine |
| CN114112411B (en) * | 2021-10-30 | 2023-09-08 | 国家能源集团华北电力有限公司廊坊热电厂 | Steam turbine shaft seal system state monitoring system and method |
| CN114635758B (en) * | 2022-02-28 | 2024-05-07 | 西安热工研究院有限公司 | Ultra-supercritical unit shaft seal system and operation method |
Citations (3)
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| CN107246284A (en) * | 2017-06-27 | 2017-10-13 | 东方电气集团东方汽轮机有限公司 | A kind of shaft seal steam supply system of extra-supercritical unit containing electric heater |
| CN108561190A (en) * | 2018-06-30 | 2018-09-21 | 神华国华广投（柳州）发电有限责任公司 | A kind of steam turbine gland system |
| CN208040456U (en) * | 2018-04-03 | 2018-11-02 | 中国神华能源股份有限公司 | Steam turbine and its gland steam system |
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| US10577962B2 (en) * | 2016-09-07 | 2020-03-03 | General Electric Company | Turbomachine temperature control system |
| CN107605541A (en) * | 2017-09-27 | 2018-01-19 | 山东中实易通集团有限公司 | Prevent 1000MW supercritical turbine packings from seizing axle envelope electric heater system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107246284A (en) * | 2017-06-27 | 2017-10-13 | 东方电气集团东方汽轮机有限公司 | A kind of shaft seal steam supply system of extra-supercritical unit containing electric heater |
| CN208040456U (en) * | 2018-04-03 | 2018-11-02 | 中国神华能源股份有限公司 | Steam turbine and its gland steam system |
| CN108561190A (en) * | 2018-06-30 | 2018-09-21 | 神华国华广投（柳州）发电有限责任公司 | A kind of steam turbine gland system |
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