CN212656870U - Cooling system for low-pressure cylinder after steam inlet of low-pressure cylinder of steam turbine is cut completely - Google Patents
Cooling system for low-pressure cylinder after steam inlet of low-pressure cylinder of steam turbine is cut completely Download PDFInfo
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- CN212656870U CN212656870U CN202020962325.9U CN202020962325U CN212656870U CN 212656870 U CN212656870 U CN 212656870U CN 202020962325 U CN202020962325 U CN 202020962325U CN 212656870 U CN212656870 U CN 212656870U
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Abstract
The utility model relates to a low pressure cylinder cooling system after the steam inlet of the low pressure cylinder of a steam turbine is completely cut, which comprises a steam turbine middle pressure cylinder, a steam turbine low pressure cylinder and a back pressure steam turbine for utilizing excess pressure; the residual pressure utilizes a back pressure steam turbine to be connected with a low pressure cylinder of the steam turbine through a low pressure cylinder cooling steam pipeline, and the low pressure cylinder cooling steam pipeline is provided with a low pressure cylinder cooling steam pipeline quick closing valve, a cooling steam flow adjusting butterfly valve and a cooling steam flow measuring device; the steam turbine intermediate pressure cylinder is connected with the low pressure cylinder cooling steam pipeline through a second intermediate pressure cylinder exhaust pipeline, and the second intermediate pressure cylinder exhaust pipeline is provided with an intermediate pressure cylinder exhaust steam supply low pressure cylinder cooling standby steam quick-closing valve. The utility model uses the exhaust steam of the intermediate pressure cylinder as a standby cooling steam source, cools the low pressure cylinder when the back pressure turbine is stopped, and ensures the operation safety of the unit after the steam inlet of the low pressure cylinder is completely cut; the residual pressure is adopted, and the back pressure type exhaust steam is used as the low-pressure cylinder cooling steam, so that the operation safety of the low-pressure cylinder is ensured, the use of high-temperature high-pressure steam is reduced, and the level of energy level gradient utilization is improved.
Description
Technical Field
The utility model belongs to the technical field of thermal power, especially, relate to a low pressure cylinder cooling system after steam turbine low pressure cylinder admission is cut entirely.
Background
The technology for cutting off heat supply of the low-pressure cylinder of the steam turbine is a relatively deep heat supply reconstruction technology in the technology for reconstructing the flexibility of the steam turbine. After the low-pressure cylinder is completely cut, the hot water supply level of a power plant is greatly improved.
The low-pressure cylinder steam inlet full-cut heat supply transformation is to cut off the steam inlet of the low-pressure cylinder, only a small amount of cooling steam is reserved to enter the low-pressure cylinder, and the rest steam is completely discharged for heat supply; the low pressure cylinder is mainly used for transmitting the torque of the high and medium pressure cylinders, and the low pressure cylinder runs with zero output force of 3000 revolutions.
After the low-pressure cylinder is subjected to steam inlet full-cut heat supply transformation, on one hand, blast will occur in the last stages of low pressure under the working condition of steam inlet full-cut operation; another aspect is high velocity recirculation of the last few stages of very small volumetric flow. The blast heating can cause thermal stress deformation and allowable stress reduction of through-flow equipment; the high-speed steam backflow and cooling water spraying can cause water erosion at the blade root; the operation safety of the unit is seriously influenced and the service life of the unit is shortened.
From the current domestic research and experience, the low-pressure cylinder steam admission full-cutting working condition of the existing unit is an extremely extreme working condition, the traditional knowledge of the minimum cooling flow of the low-pressure last-stage moving blade is broken through essentially, besides the blade strength is checked, the running state is closely monitored, a path of cooling steam needs to be added to the low-pressure cylinder, and the using flow of the steam is about 30 t/h. According to the existing research and engineering practice, the cooling steam source of the low-pressure cylinder is mostly the medium-pressure cylinder, and a temperature and pressure reducing device is arranged in part of application projects, so that the low-level use and energy waste of the high-temperature and high-pressure steam are caused after the medium-pressure cylinder is cooled after the temperature and pressure of the discharged steam is reduced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a low pressure cylinder cooling system after steam turbine low pressure cylinder admission is cut entirely adopts waste heat utilization back pressure steam turbine's steam extraction as low pressure cylinder cooling steam, saves high temperature high pressure steam's use, has both improved the energy step and has utilized the level, guarantees unit operation safety again.
The utility model provides a low pressure cylinder cooling system after the admission of steam turbine low pressure cylinder is cut entirely, utilize the back pressure steam turbine including steam turbine intermediate pressure cylinder, steam turbine low pressure cylinder, excess pressure, the steam turbine intermediate pressure cylinder is connected with the steam turbine low pressure cylinder through the intermediate and low pressure cylinder communicating pipe, the intermediate and low pressure cylinder communicating pipe is equipped with the butterfly valve that can close completely that is used for realizing the admission of steam of low pressure cylinder is cut entirely;
the steam turbine intermediate pressure cylinder is connected with the heat supply network system and the excess pressure utilization back pressure steam turbine through a first intermediate pressure cylinder exhaust pipeline and is used for enabling part of intermediate pressure cylinder exhaust steam to enter the excess pressure to utilize the back pressure steam turbine to generate power after the low pressure cylinder is completely cut in steam inlet, and enabling the other part of intermediate pressure cylinder exhaust steam to directly enter the heat supply network system to supply heat through the other branch;
the residual pressure utilizes a back pressure turbine to be connected with a low pressure cylinder of the turbine through a low pressure cylinder cooling steam pipeline, and the low pressure cylinder cooling steam pipeline is provided with a low pressure cylinder cooling steam pipeline quick closing valve, a cooling steam flow adjusting butterfly valve and a cooling steam flow measuring device;
the steam turbine intermediate pressure cylinder pass through second intermediate pressure cylinder exhaust pipe with low pressure cylinder cooling steam pipe connects, second intermediate pressure cylinder exhaust pipe is equipped with intermediate pressure cylinder exhaust and supplies the low pressure cylinder cooling reserve steam fast valve for use the intermediate pressure cylinder exhaust as the reserve cooling steam source of low pressure cylinder, the low pressure cylinder of cooling steam turbine when the residual pressure utilizes back pressure steam turbine to stop the operation.
Furthermore, the first intermediate pressure cylinder exhaust pipeline is provided with an adjusting butterfly valve and a heat supply adjusting butterfly valve and is used for carrying out flow distribution on exhaust entering excess pressure by using a back pressure turbine and a heat supply network system.
Furthermore, the low pressure cylinder cooling steam pipeline is also provided with a quick-closing valve, and when the butterfly valve of the steam turbine set on the middle and low pressure cylinder communicating pipe is in a non-full-closing working condition, the quick-closing valve is closed, so that the residual pressure is used by all the heat supply network systems using the steam exhaust of the back pressure steam turbine.
Furthermore, an extraction check valve is arranged on a branch of the first intermediate pressure cylinder exhaust pipeline to the heating system and used for preventing steam from flowing back to the steam turbine to cause overspeed by closing the extraction check valve when the steam turbine breaks down and needs emergency shutdown.
Furthermore, the exhaust pipeline of the first intermediate pressure cylinder is also provided with an exhaust quick closing valve of the intermediate pressure cylinder.
Further, the residual pressure is connected with a heat supply network system through an adjusting valve by using a back pressure turbine.
By means of the scheme, the low-pressure cylinder cooling system after the low-pressure cylinder of the steam turbine is fully cut in steam admission is adopted, the exhaust steam of the intermediate pressure cylinder is used as a standby cooling steam source, the low-pressure cylinder is cooled when the back pressure steam turbine is stopped, and the running safety of the unit after the low-pressure cylinder is fully cut in steam admission is guaranteed; the residual pressure is adopted, and the back pressure type exhaust steam is used as the low-pressure cylinder cooling steam, so that the operation safety of the low-pressure cylinder is ensured, the use of high-temperature high-pressure steam is reduced, and the level of energy level gradient utilization is improved.
The above description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention clearer and can be implemented according to the content of the description, the following detailed description is made of preferred embodiments of the present invention.
Drawings
Fig. 1 is a schematic structural diagram of the low-pressure cylinder cooling system after the steam inlet of the low-pressure cylinder of the steam turbine is completely cut.
Reference numbers in the figures:
1-a steam turbine intermediate pressure cylinder; 2-low pressure cylinder of steam turbine; 3-cooling vapor flow measuring device; 4-low pressure cylinder cooling steam pipeline fast closing valve; 5-cooling steam flow adjusting butterfly valve; 6-a butterfly valve; 7-the intermediate pressure cylinder exhausts steam to supply the low pressure cylinder to cool the standby steam fast closing valve; 8-steam extraction check valve; 9-intermediate pressure cylinder exhaust quick closing valve; 10-adjusting the butterfly valve; 11-a heat supply regulating butterfly valve; 12-a regulating valve; 13-residual pressure utilizes a back pressure turbine; 14-quick-closing valve.
Detailed Description
The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Referring to fig. 1, the embodiment provides a cooling system for a low pressure cylinder after the steam inlet of a low pressure cylinder of a steam turbine is completely cut, which includes a medium pressure cylinder 1 of the steam turbine, a low pressure cylinder 2 of the steam turbine, and a back pressure turbine 13 using excess pressure, wherein the medium pressure cylinder 1 of the steam turbine is connected with the low pressure cylinder 2 of the steam turbine through a medium and low pressure cylinder communication pipeline, and the medium and low pressure cylinder communication pipeline is provided with a butterfly valve 6 which is used for realizing the complete cut of the steam inlet of the low pressure.
The steam turbine intermediate pressure cylinder 1 is connected with the heat supply network system and the excess pressure by the back pressure steam turbine 13 through a first intermediate pressure cylinder exhaust pipeline and is used for enabling part of intermediate pressure cylinder exhaust to enter the excess pressure to generate electricity by the back pressure steam turbine 13 through a branch after the low pressure cylinder intake is cut completely, and enabling the other part of intermediate pressure cylinder exhaust to directly enter the heat supply network system for supplying heat through another branch.
The residual pressure utilizes back pressure steam turbine 13 to be connected with steam turbine low pressure jar 2 through low pressure jar cooling steam conduit, and low pressure jar cooling steam conduit is equipped with low pressure jar cooling steam conduit fast closing valve 4, cooling steam flow control butterfly valve 5 and cooling steam flow measuring device 3, monitors and adjusts the cooling steam flow that gets into the low pressure jar.
The steam turbine intermediate pressure cylinder 1 is connected with the low pressure cylinder cooling steam pipeline through a second intermediate pressure cylinder exhaust pipeline, the second intermediate pressure cylinder exhaust pipeline is provided with an intermediate pressure cylinder exhaust steam supply low pressure cylinder cooling standby steam quick-closing valve 7 for using the intermediate pressure cylinder exhaust steam as a low pressure cylinder standby cooling steam source, the low pressure cylinder of the steam turbine is cooled when the residual pressure utilizes the back pressure steam turbine to stop operation, and the operation safety of the low pressure cylinder after steam inlet full-cut unit is guaranteed.
Partial exhaust steam of the intermediate pressure cylinder enters residual pressure firstly and is used for generating power by the back pressure steam turbine, the exhaust steam is divided into two paths, one path of the exhaust steam enters the heat supply network system for supplying heat, and the other path of the exhaust steam enters the low pressure cylinder for cooling. When the low-pressure cylinder is in full-cut operation of steam inlet, cooling steam is discharged to a condenser for cooling by the original steam discharging device after the low-pressure cylinder is cooled.
According to the cooling system for the low-pressure cylinder after the steam inlet of the low-pressure cylinder of the steam turbine is completely cut off, the steam discharged by the intermediate-pressure cylinder is used as a standby cooling steam source, and the low-pressure cylinder is cooled when the back-pressure steam turbine is stopped, so that the running safety of the unit after the steam inlet of the low-pressure cylinder is completely cut off is ensured; the residual pressure is adopted, and the back pressure type exhaust steam is used as the low-pressure cylinder cooling steam, so that the operation safety of the low-pressure cylinder is ensured, the use of high-temperature high-pressure steam is reduced, and the level of energy level gradient utilization is improved.
In this embodiment, the first intermediate pressure cylinder exhaust line is provided with an adjusting butterfly valve 10 and a heat supply adjusting butterfly valve 11 for distributing the flow of the exhaust gas entering the excess pressure utilization back pressure turbine 13 and the heat supply network system. After the low-pressure cylinder is completely cut off, a large amount of exhaust steam of the intermediate-pressure cylinder can be used for heat supply, flow distribution is carried out by utilizing the adjusting butterfly valve 10 and the heat supply adjusting butterfly valve 11, and when the residual pressure is ensured to be operated by utilizing the high efficiency of the back pressure steam turbine, the redundant exhaust steam of the intermediate-pressure cylinder directly enters the heat supply network system for heat supply.
In this embodiment, the low-pressure cylinder cooling steam pipeline is further provided with a quick-closing valve 14, and when the butterfly valve 6 of the steam turbine set on the low-pressure cylinder communicating pipe is in a non-fully-closed working condition, the quick-closing valve 14 is closed, so that the residual pressure is used by the back pressure steam turbine 13 to exhaust all heat supply network systems.
In this embodiment, the branch of the first intermediate pressure cylinder exhaust pipeline to the heating system is provided with the steam extraction check valve 8, and the steam extraction check valve 8 is closed to prevent steam from flowing back to the steam turbine to cause overspeed when the steam turbine breaks down and needs emergency shutdown.
In this embodiment, the first intermediate pressure cylinder exhaust pipe is further provided with an intermediate pressure cylinder exhaust quick closing valve 9.
In the present exemplary embodiment, the excess pressure is connected to the heat supply system via a control valve 12 by means of a back pressure turbine 13.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (6)
1. The cooling system for the low-pressure cylinder after the steam inlet of the low-pressure cylinder of the steam turbine is completely cut is characterized by comprising a steam turbine intermediate-pressure cylinder (1), a steam turbine low-pressure cylinder (2) and a residual pressure utilization back pressure steam turbine (13), wherein the steam turbine intermediate-pressure cylinder (1) is connected with the steam turbine low-pressure cylinder (2) through a medium-low pressure cylinder communicating pipeline, and the medium-low pressure cylinder communicating pipeline is provided with a butterfly valve (6) which is used for realizing the complete cut of the steam inlet of the low-pressure cylinder and can be completely closed;
the steam turbine intermediate pressure cylinder (1) is connected with the heat supply network system and the excess pressure utilization back pressure steam turbine (13) through a first intermediate pressure cylinder exhaust pipeline, and is used for enabling part of intermediate pressure cylinder exhaust steam to enter the excess pressure utilization back pressure steam turbine (13) through one branch after low pressure cylinder steam inlet is completely cut, and enabling the other part of intermediate pressure cylinder exhaust steam to directly enter the heat supply network system for heat supply through the other branch;
the residual pressure is connected with a low-pressure cylinder (2) of the steam turbine by a low-pressure cylinder cooling steam pipeline through a back pressure steam turbine (13), and the low-pressure cylinder cooling steam pipeline is provided with a low-pressure cylinder cooling steam pipeline quick-closing valve (4), a cooling steam flow regulating butterfly valve (5) and a cooling steam flow measuring device (3);
steam turbine intermediate pressure cylinder (1) through second intermediate pressure cylinder exhaust pipe with low pressure cylinder cooling steam pipe connects, second intermediate pressure cylinder exhaust pipe is equipped with intermediate pressure cylinder exhaust and supplies low pressure cylinder cooling reserve steam fast-closing valve (7) for use the intermediate pressure cylinder exhaust as the reserve cooling steam source of low pressure cylinder, cooling steam turbine low pressure cylinder when the residual pressure utilizes back pressure steam turbine to stop the operation.
2. The system for cooling the low-pressure cylinder after the steam inlet of the low-pressure cylinder of the steam turbine is completely cut off according to claim 1, wherein the exhaust pipeline of the first intermediate-pressure cylinder is provided with a regulating butterfly valve (10) and a heat supply regulating butterfly valve (11) for distributing the flow of the exhaust entering the excess pressure by using a back-pressure steam turbine (13) and a heat supply network system.
3. The system for cooling the low-pressure cylinder after the steam inlet of the low-pressure cylinder of the steam turbine is completely cut off according to claim 1, wherein the cooling steam pipeline of the low-pressure cylinder is further provided with a quick-closing valve (14) for closing the quick-closing valve (14) when a butterfly valve (6) of the steam turbine set on a communication pipe of the low-pressure cylinder and the medium-pressure cylinder is in a non-completely-closed working condition, so that the residual pressure is used for the whole heat supply network system by utilizing the steam exhaust of the back-pressure steam turbine (13).
4. The cooling system for the low-pressure cylinder after the steam inlet of the steam turbine is completely cut off as claimed in claim 2, wherein an extraction check valve (8) is arranged on a branch of the exhaust pipeline of the first intermediate-pressure cylinder to the heat supply system, and is used for preventing steam from flowing back to the steam turbine to cause overspeed by closing the extraction check valve (8) when the steam turbine breaks down and needs emergency shutdown.
5. The system for cooling the low pressure cylinder after the steam inlet of the low pressure cylinder of the steam turbine is cut completely according to claim 4, wherein the exhaust pipeline of the first intermediate pressure cylinder is further provided with an exhaust quick closing valve (9) of the intermediate pressure cylinder.
6. The system for cooling the low-pressure cylinder after the inlet steam of the low-pressure cylinder of the steam turbine is completely cut off according to claim 1, characterized in that the excess pressure is connected with a heat supply network system by a back-pressure steam turbine (13) through an adjusting valve (12).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020962325.9U CN212656870U (en) | 2020-05-30 | 2020-05-30 | Cooling system for low-pressure cylinder after steam inlet of low-pressure cylinder of steam turbine is cut completely |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020962325.9U CN212656870U (en) | 2020-05-30 | 2020-05-30 | Cooling system for low-pressure cylinder after steam inlet of low-pressure cylinder of steam turbine is cut completely |
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| CN212656870U true CN212656870U (en) | 2021-03-05 |
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| CN202020962325.9U Active CN212656870U (en) | 2020-05-30 | 2020-05-30 | Cooling system for low-pressure cylinder after steam inlet of low-pressure cylinder of steam turbine is cut completely |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111677569A (en) * | 2020-05-30 | 2020-09-18 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Cooling system for low-pressure cylinder after steam inlet of low-pressure cylinder of steam turbine is cut completely |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111677569A (en) * | 2020-05-30 | 2020-09-18 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Cooling system for low-pressure cylinder after steam inlet of low-pressure cylinder of steam turbine is cut completely |
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