CN211598768U - Steam turbine set system of steam extraction back pressure type water supply pump - Google Patents
Steam turbine set system of steam extraction back pressure type water supply pump Download PDFInfo
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- CN211598768U CN211598768U CN201921906341.XU CN201921906341U CN211598768U CN 211598768 U CN211598768 U CN 211598768U CN 201921906341 U CN201921906341 U CN 201921906341U CN 211598768 U CN211598768 U CN 211598768U
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- water feeding
- feeding pump
- heater
- steam
- small
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Abstract
The utility model relates to a steam extraction back pressure type water feeding pump steam turbine set system, which comprises a small steam turbine of a water feeding pump, the water feeding pump, a small power balance generator, a water feeding pump speed regulating device, a first heater, a second heater, a third heater, a driving steam pipeline, a discharge pipeline, a steam extraction and steam supplement pipeline and a water feeding pipeline; the water feeding pump, the water feeding pump speed regulating device, the small steam turbine of the water feeding pump and the small power balance generator are coaxially connected; the small steam turbine of the water feeding pump is connected with the first heater through an air extraction pipeline; the small steam turbine of the water feeding pump is connected with the second heater and the third heater through an exhaust pipeline; the small steam turbine of the water feeding pump is connected with the driving steam pipeline; the small steam turbine of the water feeding pump is connected with the discharge pipeline; the steam extraction and supplement pipeline is connected with the third heater; the water supply pipeline is communicated with the water sides of the first heater, the second heater and the third heater. The utility model discloses can ensure the power balance of a whole set of system, improve the little steam turbine efficiency of feed pump to improve the efficiency of a whole set of system, practice thrift the coal consumption.
Description
Technical Field
The utility model belongs to the technical field of thermal power, especially, relate to a steam extraction back pressure type water-feeding pump steam turbine set system.
Background
With the development of million-first-reheat, two-reheat high-parameter and large-capacity generator sets, the high-parameter ultra-supercritical generator set with 35 MPa-level steam inlet parameters is becoming a research object, the cycle thermal efficiency of the generator set can be further improved, and energy conservation and emission reduction are greatly promoted.
In order to reduce the superheat degree of steam extraction heat return under the high parameter condition, a steam extraction back pressure type water feeding pump steam turbine set system is provided. Namely, a water feeding pump is driven by a small steam turbine with a steam extraction back pressure type, namely, a heater of a middle steam extraction joint belt part of the small steam turbine is arranged at the same time. The small turbine and the main turbine of the water supply pump are simultaneously connected with the regenerative heater, so the system is also called a double-machine regenerative system.
The system has the advantages that the superheat degree of regenerative extraction steam can be fully utilized, the design condition of the heater can be reduced, the manufacturing cost can be reduced, and the high-efficiency design of a small steam turbine can be ensured.
Meanwhile, the system has the problem that the complexity of the small steam turbine of the traditional water feeding pump is increased compared with the complexity of the small steam turbine of the traditional water feeding pump. At the moment, the small turbine coaxially drives the water feeding pump, and meanwhile, the partial heater is connected, so that the power balance and thermodynamic system are relatively complex, and requirements are provided for system matching design and operation flexibility.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a steam extraction back pressure type water-feeding pump steam turbine set system carries out water-feeding pump little steam turbine power balance and backpressure control through setting up the small power balance generator, when can realize water-feeding pump little steam turbine synchronous drive water-feeding pump and take the heater, realizes the power balance and the backpressure stable control of shafting.
The utility model provides a steam extraction back pressure type water feeding pump steam turbine set system, which comprises a small water feeding pump steam turbine, a water feeding pump, a small power balance generator, a water feeding pump speed regulating device, a first heater, a second heater, a third heater, a driving steam pipeline, a discharge pipeline, a steam extraction and steam supplementation pipeline and a water feeding pipeline;
the water feeding pump, the water feeding pump speed regulating device, the small water feeding pump turbine and the small power balance generator are coaxially connected, the small water feeding pump turbine is used for coaxially driving the small power balance generator and the water feeding pump speed regulating device, and the water feeding pump speed regulating device is used for coaxially driving the water feeding pump;
the small water feeding pump turbine is connected with the first heater through an air extraction pipeline and used for extracting air from the middle of the small water feeding pump turbine to heat water fed in the first heater; the small water feeding pump turbine is connected with the second heater and the third heater through an exhaust pipeline and used for heating water fed in the second heater and the third heater through exhaust of the small water feeding pump turbine;
the small water feeding pump turbine is connected with the driving steam pipeline and used for driving the small water feeding pump turbine through driving steam extracted by the main turbine;
the small water feeding pump turbine is connected with the discharge pipeline and used for directly conveying the exhaust of the small water feeding pump turbine into the condenser through the discharge pipeline;
the steam extraction and steam supplement pipeline is connected with the third heater and used for heating the feed water in the third heater through the extraction steam from the main turbine;
and the water supply pipeline is communicated with the water sides of the first heater, the second heater and the third heater.
By means of the scheme, the steam inlet flow of the small turbine entering the small turbine is greatly improved by adopting the steam extraction back pressure type water feeding pump small turbine through the steam extraction back pressure type water feeding pump steam turbine set system, the efficiency of the water feeding pump small turbine is improved to 90%, and the efficiency can be improved by about 5-6% compared with that of a traditional water feeding pump small turbine; in addition, the superheat degree of the steam entering the heater is greatly reduced. The above benefits can achieve the purpose of energy saving and consumption reduction of the whole set of unit at about 1 g/kilowatt hour, and meanwhile, the power generated by the whole set of unit can be increased by about 2 percent due to the arrangement of the small power balance generator.
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 with reference to the preferred embodiments of the present invention and accompanying drawings.
Drawings
Fig. 1 is a schematic structural diagram of the steam extraction back pressure feed pump steam turbine unit system of the present invention.
Reference numbers in the figures:
1-a small steam turbine of a water supply pump; 2-a feed pump; 3-power balance small generator; 4-a feed pump speed regulating device; 5-a first heater; 6-a second heater; 7-a third heater; 8-driving the steam pipeline; 9-a discharge line; 10-steam extraction and steam supplement pipeline; 11-water supply line.
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 present embodiment provides a steam extraction back-pressure water supply pump steam turbine set system, which includes a small water supply pump steam turbine 1, a water supply pump 2, a small power balance generator 3, a water supply pump speed adjusting device 4, a first heater 5, a second heater 6, a third heater 7, a driving steam pipeline 8, a discharge pipeline 9, a steam extraction and steam supplementation pipeline 10, and a water supply pipeline 11; the water feeding pump 2, the water feeding pump speed regulating device 4, the small water feeding pump turbine 1 and the small power balance generator 3 are coaxially connected, the small water feeding pump turbine 1 is used for coaxially driving the small power balance generator 3 and the water feeding pump speed regulating device 4, and the water feeding pump speed regulating device 4 is used for coaxially driving the water feeding pump 2; the small water feeding pump turbine 1 is connected with the first heater 5 through an air extraction pipeline and used for extracting air from the middle of the small water feeding pump turbine to heat water fed in the first heater 5; the small feed pump turbine 1 is connected with the second heater 6 and the third heater 7 through an exhaust pipeline and used for heating feed water in the second heater 6 and the third heater 7 through exhaust of the small feed pump turbine; the small feed pump turbine 1 is connected with a driving steam pipeline 8 and used for driving the small feed pump turbine 1 (entering the first stage of the small feed pump turbine 1 for driving) through driving steam extracted by the main turbine; the small water feeding pump turbine 1 is connected with a discharge pipeline 9 and used for directly conveying exhaust gas of the small water feeding pump turbine into a condenser through the discharge pipeline 9; the steam extraction and steam supplement pipeline 10 is connected with the third heater 7 and is used for heating the feed water in the third heater 7 through the extraction steam from the main turbine; the water supply line 11 communicates with the water side of the first heater 5, the second heater 6, and the third heater 7.
The steam turbine set system of the steam extraction back pressure type water feeding pump is connected with a first heater 5, a second heater 6 and a third heater 7 through a small steam turbine 1 of the steam extraction back pressure type water feeding pump, simultaneously drives a water feeding pump 2, main residual power is balanced through a small power balance generator 3, the back pressure of the small steam turbine 1 of the water feeding pump is jointly controlled through a discharge pipeline 9 and a steam extraction and steam supplement pipeline 10, and power balance of the whole set of system is ensured. Meanwhile, the configuration of the small steam turbine of the steam extraction back pressure type water feeding pump can improve the efficiency of the small steam turbine of the water feeding pump to 90 percent, improve the efficiency of the whole system and save about 1 gram/kilowatt hour of coal consumption.
The operation method of the steam extraction back pressure type water feeding pump steam turbine set system comprises the following steps:
the small water feeding pump turbine 1 uses the driving steam extracted by the main turbine as a steam source, and drives the water feeding pump 2 through the water feeding pump speed regulating device 4 to perform variable speed regulation of water feeding quantity;
the method comprises the following steps of heating the water supply in a first heater 5, a second heater 6 and a third heater 7 through the middle steam extraction of a small steam turbine 1 of a water supply pump, and performing steam extraction regenerative operation of the small steam turbine of the water supply pump;
the driving power of the small turbine 1 of the water feeding pump is balanced by the small power balance generator 3 after the power for driving the water feeding pump and the middle steam extraction heat regeneration is deducted;
the back pressure control of normal operation is carried out by overflowing the exhausted steam of the small steam turbine 1 of the water feeding pump to the third heater 7, and when abnormal back pressure occurs, the back pressure is controlled through the exhaust pipeline 9 or the steam extraction and steam supplement pipeline 10, so that the back pressure of the small steam turbine 1 of the water feeding pump is ensured to be kept stable under various working conditions.
In the embodiment, the parameters of the small steam turbine 1 of the water supply pump for driving the steam pipeline 8 are 6-14MPa and 350-450 ℃, the exhaust back pressure can be 0.65-1.0MPa, and the intermediate extraction stage number can be specifically matched and selected according to the actual project requirements. The power of the small power balance generator 3 can be matched and selected according to the power of the water feeding pump and the extraction power requirements of the connected regenerative first heater 5, the second heater 6 and the third heater 7.
In the embodiment, in order to ensure the control of the back pressure of the small steam turbine 1 of the feed water pump, on one hand, the unbalanced power of the shafting is absorbed by the small power balance generator 3, and on the other hand, when the back pressure changes greatly, the back pressure can be maintained at a required value through the discharge pipeline 9 and the steam extraction and steam supplement pipeline 10.
In this embodiment, when the exhaust back pressure of the small turbine 1 of the feed pump is abnormally high, the exhaust pipeline 9 of the condenser is opened to perform pressure relief control, and when the back pressure is low, the exhaust and steam supplement pipeline 10 is closed to perform steam extraction into the second heater 6 and the third heater 7 to perform back pressure boost control.
Because the system adopts the small steam turbine of the steam extraction back pressure type water feeding pump, the steam inlet flow entering the small machine is greatly improved, on one hand, the efficiency of the small steam turbine of the water feeding pump is improved, and on the other hand, the superheat degree of the inlet steam of the heater is reduced, thereby realizing the purposes of energy conservation and consumption reduction.
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 (1)
1. A steam extraction back pressure type water feeding pump steam turbine set system is characterized by comprising a small water feeding pump steam turbine, a water feeding pump, a small power balance generator, a water feeding pump speed regulating device, a first heater, a second heater, a third heater, a driving steam pipeline, a discharge pipeline, a steam extraction and supplement pipeline and a water feeding pipeline;
the water feeding pump, the water feeding pump speed regulating device, the small water feeding pump turbine and the small power balance generator are coaxially connected, the small water feeding pump turbine is used for coaxially driving the small power balance generator and the water feeding pump speed regulating device, and the water feeding pump speed regulating device is used for coaxially driving the water feeding pump;
the small water feeding pump turbine is connected with the first heater through an air extraction pipeline and used for extracting air from the middle of the small water feeding pump turbine to heat water fed in the first heater; the small water feeding pump turbine is connected with the second heater and the third heater through an exhaust pipeline and used for heating water fed in the second heater and the third heater through exhaust of the small water feeding pump turbine;
the small water feeding pump turbine is connected with the driving steam pipeline and used for driving the small water feeding pump turbine through driving steam extracted by the main turbine;
the small water feeding pump turbine is connected with the discharge pipeline and used for directly conveying the exhaust of the small water feeding pump turbine into the condenser through the discharge pipeline;
the steam extraction and steam supplement pipeline is connected with the third heater and used for heating the feed water in the third heater through the extraction steam from the main turbine;
and the water supply pipeline is communicated with the water sides of the first heater, the second heater and the third heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921906341.XU CN211598768U (en) | 2019-11-06 | 2019-11-06 | Steam turbine set system of steam extraction back pressure type water supply pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921906341.XU CN211598768U (en) | 2019-11-06 | 2019-11-06 | Steam turbine set system of steam extraction back pressure type water supply pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211598768U true CN211598768U (en) | 2020-09-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921906341.XU Expired - Fee Related CN211598768U (en) | 2019-11-06 | 2019-11-06 | Steam turbine set system of steam extraction back pressure type water supply pump |
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| Country | Link |
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| CN (1) | CN211598768U (en) |
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2019
- 2019-11-06 CN CN201921906341.XU patent/CN211598768U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200929 Termination date: 20211106 |