CN214464421U - Shaft seal auxiliary steam source hot standby device - Google Patents
Shaft seal auxiliary steam source hot standby device Download PDFInfo
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- CN214464421U CN214464421U CN202120595015.2U CN202120595015U CN214464421U CN 214464421 U CN214464421 U CN 214464421U CN 202120595015 U CN202120595015 U CN 202120595015U CN 214464421 U CN214464421 U CN 214464421U
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Abstract
The utility model discloses a shaft seal auxiliary steam source hot standby device, wherein, the steam inlets of the shaft seal bodies of a high pressure cylinder, a middle pressure cylinder and a low pressure cylinder are communicated with a shaft seal steam main pipe; the auxiliary steam pipeline is divided into two paths after passing through the shaft seal steam supply regulating valve, wherein one path is communicated with the shaft seal steam main pipe, and the other path is communicated with the low-pressure heater through the first pre-warming valve and the throttling hole; the shaft seal overflow pipeline is communicated with the low-pressure heater through a shaft seal overflow adjusting door; the extraction steam of the intermediate pressure cylinder is divided into two paths after passing through the steam extraction pipeline of the steam turbine and the steam extraction check valve, wherein one path is communicated with the extraction user, and the other path is communicated with the auxiliary steam pipeline through the second pre-warming valve.
Description
Technical Field
The utility model belongs to the technical field of power plant's steam turbine is energy-conserving and safe operation, a hot spare equipment of supplementary vapour source of shaft seal is related to.
Background
The shaft seal system is an important component of a power station steam turbine, has the main function of supplying qualified steam to the end part of each cylinder of the steam turbine, prevents the steam from leaking outwards along the shaft end of the cylinder and even entering a bearing box to cause water inflow in lubricating oil, prevents air from leaking into a vacuum shaft seal to cause vacuum reduction of a condenser, and is an important system for maintaining the vacuum of the condenser and ensuring the safe operation of the steam turbine.
And at the starting stage of the unit, shaft seal steam is provided by an auxiliary steam system and enters the end part of the steam turbine after the pressure is regulated by a shaft seal steam supply valve group. In the process of load increase of the steam turbine, the steam inlet flow of the high-pressure cylinder is increased, shaft seal leakage steam at the end of the high-pressure cylinder supplies steam to a shaft seal of the low-pressure cylinder through a shaft seal main pipe, and a shaft seal steam source is gradually transited to high-pressure cylinder steam seal leakage steam from auxiliary steam to achieve a self-sealing effect. Meanwhile, the system is provided with a shaft seal steam overflow pipeline, and redundant steam is discharged to a condenser or a low-pressure heater.
The steam seal clearance at the end part of the steam turbine is an important factor for determining the steam leakage amount, and the large steam seal clearance can cause excessive steam leakage in the high and medium pressure cylinders of the steam turbine, reduce the work of steam and influence the economical efficiency of a unit. The bearing seal clearance is less, and the temperature takes place to show when host computer bearing seal department changes, and high, intermediate pressure cylinder tip bearing seal and bearing seal department main shaft can take place sharp cooling shrink, probably leads to the inside sound part of bearing seal or cylinder to bump the mill, and then leads to the turbine main shaft to be locked in bearing seal department, not only influences unit normal operating, more has the risk that causes serious incident.
In recent years, with the continuous development of national energy conservation and emission reduction work, various efficient, novel and reliable new steam seal technologies are developed for improving the economic performance of unit operation. At present, the shaft seal clearance of a 1000MW and 660MW main unit newly built in the electric power industry of China is reduced to the level of 0.3 mm. A steam seal structure is improved in a plurality of old power plants, so that the steam seal gap at the end part of the steam turbine is reduced, and the aims of reducing coal consumption and improving the operation efficiency of the unit are fulfilled. With the advance of new technology, corresponding problems also come along, and the problem of shaft seal locking caused by severe change of shaft seal steam supply temperature in domestic existing power plants is solved. Analyzing the reasons, most of the locking working conditions occur in the shutdown or accident tripping process of the unit. When the steam turbine is stopped, shaft seal steam is switched into auxiliary steam from self-sealing, and because the auxiliary steam does not overflow the steam to the shaft seal steam supply pipeline for a long time, the steam storage temperature of the pipeline is low, and after the auxiliary steam enters the cylinder, a shaft seal body and the large shaft are rapidly cooled, so that locking occurs. In view of the situation, in many power plants, the shaft seal steam supply valve is arranged at the minimum steam supply opening so that the valve cannot be completely closed, or the long-open pipeline is drained to keep the shaft seal steam supply pipeline in a hot standby state. The two modes ensure the safety of the unit, but also cause the waste of high-quality steam, and the aim of shaft seal transformation is south-beam northern rut.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a hot stand-by device in supplementary vapour source of shaft seal, the device can guarantee the security of unit, avoids causing the waste of high-quality steam simultaneously.
In order to achieve the above object, the shaft seal auxiliary steam source hot standby device of the present invention comprises a high pressure cylinder, an intermediate pressure cylinder, a low pressure cylinder, a shaft seal steam main pipe, a shaft seal steam supply adjusting door, a first pre-warming valve, a throttle hole, a low pressure heater, a shaft seal overflow pipeline, a shaft seal overflow adjusting door, a steam turbine steam extraction pipeline, a steam extraction check valve and a second pre-warming valve;
the shaft seal steam inlets of the high pressure cylinder, the intermediate pressure cylinder and the low pressure cylinder are communicated with a shaft seal steam main pipe;
the outlet of the auxiliary steam header is connected with an auxiliary steam pipeline, the auxiliary steam pipeline is divided into two paths after passing through a shaft seal steam supply adjusting valve, one path is communicated with a shaft seal steam main pipe, and the other path is communicated with a low-pressure heater through a first pre-warming valve and a throttling hole;
the shaft seal overflow pipeline is communicated with the low-pressure heater through a shaft seal overflow adjusting door;
the steam extraction port of the intermediate pressure cylinder is divided into two paths after passing through a steam extraction pipeline of the steam turbine and a steam extraction electric door, wherein one path is communicated with a steam extraction user, and the other path is communicated with an auxiliary steam pipeline through a second pre-warming valve.
The auxiliary steam pipeline is communicated with the shaft seal steam main pipe through a shaft seal steam supply adjusting door and the shaft seal steam supply main pipe.
The steam extraction port of the intermediate pressure cylinder is divided into two paths after passing through a steam extraction pipeline of the steam turbine, a steam extraction check valve and a steam extraction electric valve.
The connecting position of the second pre-warming valve and the auxiliary steam pipeline is positioned in front of the inlet of the shaft seal steam supply regulating valve.
The connecting position of the shaft seal overflow pipeline and the shaft seal steam main pipe is positioned between the high-pressure cylinder and the intermediate-pressure cylinder.
The connecting position of the shaft seal steam supply pipeline and the shaft seal steam main pipe is positioned between the intermediate pressure cylinder and the low pressure cylinder.
The utility model discloses following beneficial effect has:
the utility model discloses a hot stand-by device of supplementary vapour source of bearing seal when concrete work, through the bearing seal steam supply governing valve and the opening of bearing seal overflow governing valve judge the running state of bearing seal system, after self-sealing, with the auxiliary steam pipeline with steam turbine steam extraction pipeline intercommunication, the warm braw steam circulation that the intermediate pressure jar extracted is to the auxiliary steam pipeline, backward circulation again is to the auxiliary steam header; meanwhile, the shaft seal steam supply main pipe is communicated with the low-pressure heater, steam reversely flows to the shaft seal steam supply main pipe from the shaft seal steam supply main pipe and then flows into the low-pressure heater, so that the auxiliary steam pipeline and the shaft seal steam supply main pipe are kept in a hot standby state at any time, steam of a heating pipe is effectively utilized, and the economical efficiency and the safety of a unit are maintained.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is high pressure cylinder, 2 is the intermediate pressure cylinder, 3 is the low pressure cylinder, 4 is the gland seal and supplies vapour regulating gate, 5 is gland seal overflow regulating gate, 6 is first warms up the valve, 7 is the orifice, 8 is the second warms up the valve, 9 is the check valve of drawing vapour, 10 is the electric door of drawing vapour, 11 is the auxiliary steam header, 12 is the low pressure heater, 13 is the female pipe of gland seal steam, 14 is the female pipe of gland seal supply vapour, 15 is the gland seal overflow pipeline, 16 is the auxiliary vapour pipeline.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the shaft seal auxiliary steam source hot standby device of the present invention includes a high pressure cylinder 1, an intermediate pressure cylinder 2, a low pressure cylinder 3, a shaft seal steam main pipe 13, a shaft seal steam supply main pipe 14, a shaft seal steam supply adjusting door 4, a first pre-warming valve 6, a throttle hole 7, a low pressure heater 12, a shaft seal overflow pipeline 15, a shaft seal overflow adjusting door 5, a steam turbine steam extraction pipeline, a steam extraction check valve 9, and a second pre-warming valve 8; the shaft seal steam inlets of the high pressure cylinder 1, the intermediate pressure cylinder 2 and the low pressure cylinder 3 are communicated with a shaft seal steam main pipe 13; the outlet of the auxiliary steam header 11 is connected with an auxiliary steam pipeline 16, the auxiliary steam pipeline 16 is divided into two paths after passing through a shaft seal steam supply adjusting valve 4, one path is communicated with a shaft seal steam main pipe 13, and the other path is communicated with a low-pressure heater 12 through a first pre-warming valve 6 and a throttling hole 7; the shaft seal overflow pipeline 15 is communicated with the low-pressure heater 12 through a shaft seal overflow adjusting door 5; the steam extraction port of the intermediate pressure cylinder 2 is divided into two paths after passing through a steam extraction pipeline of the steam turbine and a steam extraction electric door 10, wherein one path is communicated with a steam extraction user, and the other path is communicated with an auxiliary steam pipeline 16 through a second pre-warming valve 8.
The auxiliary steam pipeline 16 is communicated with the shaft seal steam main pipe 13 through the shaft seal steam supply adjusting door 4 and the shaft seal steam supply main pipe 14; the connecting position of the second pre-warming valve 8 and the auxiliary steam pipeline 16 is positioned in front of the inlet of the shaft seal steam supply regulating door 4;
the connecting position of the shaft seal overflow pipeline 15 and the shaft seal steam main pipe 13 is positioned between the high-pressure cylinder 1 and the intermediate-pressure cylinder 2; the connection position of the shaft seal steam supply main pipe 14 and the shaft seal steam main pipe 13 is positioned between the intermediate pressure cylinder 2 and the low pressure cylinder 3.
The utility model discloses a concrete working process does:
when the unit starts to use the shaft seal, the shaft seal overflow adjusting door 5 is fully closed, the shaft seal steam supply adjusting door 4 is opened, and the first pre-warming valve 6 and the second pre-warming valve 8 are closed simultaneously;
gradually closing the shaft seal steam supply adjusting door 4 along with the load rise of the unit, then opening the shaft seal overflow adjusting door 5, and opening the first pre-warming valve 6 and the second pre-warming valve 8 when the opening degree of the shaft seal steam supply adjusting door 4 is less than or equal to 3% and the opening degree of the shaft seal overflow adjusting door 5 is greater than or equal to 3%;
when the unit is shut down, when the opening degree of the shaft seal steam supply adjusting door 4 is more than or equal to 3 percent and the opening degree of the shaft seal overflow adjusting door 5 is less than or equal to 3 percent, the first pre-warming valve 6 and the second pre-warming valve 8 are closed;
and when the unit accident working condition trips or loads are relieved, the first pre-heating valve 6 and the second pre-heating valve 8 are closed.
The utility model discloses both can be used to newly-built unit, also can be used to present unit transformation, and the unit operation is kept the bearing seal auxiliary steam and is at hot stand-by state, and when shutting down or accident tripping operation, the assurance supplies to the auxiliary steam temperature of bearing seal system great fluctuation of disappearance, avoids appearing the shaft seal body and major axis friction, even locking incident.
Claims (6)
1. A shaft seal auxiliary steam source heat standby device is characterized by comprising a high-pressure cylinder (1), an intermediate-pressure cylinder (2), a low-pressure cylinder (3), a shaft seal steam main pipe (13), a shaft seal steam supply main pipe (14), a shaft seal steam supply adjusting door (4), a first pre-warming valve (6), a throttling hole (7), a low-pressure heater (12), a shaft seal overflow pipeline (15), a shaft seal overflow adjusting door (5), a steam turbine steam extraction pipeline, a steam extraction check valve (9) and a second pre-warming valve (8);
the shaft seal steam inlets of the high pressure cylinder (1), the intermediate pressure cylinder (2) and the low pressure cylinder (3) are communicated with a shaft seal steam main pipe (13);
the outlet of the auxiliary steam header (11) is connected with an auxiliary steam pipeline (16), the auxiliary steam pipeline (16) is divided into two paths after passing through a shaft seal steam supply adjusting valve (4), wherein one path is communicated with a shaft seal steam main pipe (13), and the other path is communicated with a low-pressure heater (12) through a first pre-warming valve (6) and a throttling hole (7);
the shaft seal overflow pipeline (15) is communicated with the low-pressure heater (12) through a shaft seal overflow adjusting door (5);
the steam extraction port of the intermediate pressure cylinder (2) is divided into two paths after passing through a steam extraction pipeline of a steam turbine and a steam extraction electric door (10), wherein one path is communicated with a steam extraction user, and the other path is communicated with an auxiliary steam pipeline (16) through a second pre-warming valve (8).
2. The shaft seal auxiliary steam source hot standby device according to claim 1, characterized in that the auxiliary steam pipeline (16) is communicated with the shaft seal steam main pipe (13) through the shaft seal steam supply adjusting door (4) and the shaft seal steam supply main pipe (14).
3. The shaft seal auxiliary steam source hot standby device according to claim 1, characterized in that a steam extraction port of the intermediate pressure cylinder (2) is divided into two paths after passing through a steam extraction pipeline of a steam turbine, a steam extraction check valve (9) and a steam extraction electric valve (10).
4. A shaft seal auxiliary steam source hot standby device according to claim 1, characterized in that the connection position of the second pre-warming valve (8) and the auxiliary steam pipe (16) is located before the inlet of the shaft seal steam supply regulating door (4).
5. The shaft seal auxiliary steam source hot standby device according to claim 1, characterized in that the connection position of the shaft seal overflow pipeline (15) and the shaft seal steam main pipe (13) is positioned between the high pressure cylinder (1) and the intermediate pressure cylinder (2).
6. The shaft seal auxiliary steam source hot standby device according to claim 1, characterized in that the connection position of the shaft seal steam supply main pipe (14) and the shaft seal steam main pipe (13) is positioned between the intermediate pressure cylinder (2) and the low pressure cylinder (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120595015.2U CN214464421U (en) | 2021-03-23 | 2021-03-23 | Shaft seal auxiliary steam source hot standby device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120595015.2U CN214464421U (en) | 2021-03-23 | 2021-03-23 | Shaft seal auxiliary steam source hot standby device |
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| Publication Number | Publication Date |
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| CN214464421U true CN214464421U (en) | 2021-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202120595015.2U Active CN214464421U (en) | 2021-03-23 | 2021-03-23 | Shaft seal auxiliary steam source hot standby device |
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| CN (1) | CN214464421U (en) |
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2021
- 2021-03-23 CN CN202120595015.2U patent/CN214464421U/en active Active
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