CN110894797A - A steam extraction back pressure feed pump steam turbine unit system and operation method - Google Patents
A steam extraction back pressure feed pump steam turbine unit system and operation method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 138
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 239000013589 supplement Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 230000001172 regenerating effect Effects 0.000 claims description 7
- 239000008236 heating water Substances 0.000 claims description 2
- 230000001502 supplementing effect Effects 0.000 claims description 2
- 239000003245 coal Substances 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 3
- 230000009469 supplementation Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000002159 abnormal effect 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
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/345—Control or safety-means particular thereto
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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Abstract
本发明涉及一种抽汽背压式给水泵汽轮机组系统及运行方法，该系统包括给水泵小汽轮机、给水泵、功率平衡小发电机、给水泵调速装置、第一加热器、第二加热器、第三加热器、驱动蒸汽管路、排放管路、抽汽补汽管路、给水管路；给水泵、给水泵调速装置、给水泵小汽轮机、功率平衡小发电机同轴连接；给水泵小汽轮机通过抽气管路与第一加热器连接；给水泵小汽轮机通过排气管路与第二加热器及第三加热器连接；给水泵小汽轮机与驱动蒸汽管路连接；给水泵小汽轮机与所述排放管路连接；抽汽补汽管路与第三加热器连接；给水管路与第一加热器、第二加热器、第三加热器的水侧相连通。本发明能够确保整套系统的功率平衡，提高给水泵小汽轮机效率，并提高整套系统的效率，节约煤耗。
The invention relates to a steam extraction back pressure feed water pump steam turbine unit system and operation method. The system includes a feed water pump small steam turbine, a feed water pump, a power balance small generator, a feed water pump speed control device, a first heater, a second heater The boiler, the third heater, the driving steam pipeline, the discharge pipeline, the extraction and supplementary steam pipeline, and the water supply pipeline; the feed pump, the feed pump speed control device, the feed pump small steam turbine, and the power balance small generator are coaxially connected; The small steam turbine of the feed water pump is connected to the first heater through the air extraction pipeline; the small steam turbine of the feed water pump is connected to the second heater and the third heater through the exhaust pipeline; the small steam turbine of the feed water pump is connected to the driving steam pipeline; The steam turbine is connected with the discharge pipeline; the steam extraction and supplementary pipeline is connected with the third heater; the water supply pipeline is connected with the water sides of the first heater, the second heater and the third heater. The invention can ensure the power balance of the whole system, improve the efficiency of the small steam turbine of the feed water pump, improve the efficiency of the whole system, and save coal consumption.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a steam extraction back pressure type water feeding pump steam turbine set system and an operation method.
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.
Disclosure of Invention
The invention aims to provide a steam extraction back pressure type water feeding pump steam turbine set system and an operation method thereof.
The invention 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, wherein the steam extraction and steam supplementation pipeline is connected with the water feeding pump speed regulating device;
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.
The invention also provides an operation method of the steam extraction back pressure type water feeding pump steam turbine unit system, which comprises the following steps:
the small turbine of the feed water pump takes the driving steam extracted by the main turbine as a steam source, and drives the feed water pump through a feed water pump speed regulating device to carry out variable speed regulation on the feed water quantity;
heating the water supply in the first heater, the second heater and the third heater by extracting steam in the middle of the small steam turbine of the water supply pump, and performing regenerative steam extraction operation on the small steam turbine of the water supply pump;
the driving power of the small turbine of the water feeding pump is balanced by the small power balance generator after the power for driving the water feeding pump and the middle steam extraction heat return is deducted;
the back pressure control of normal operation is carried out to the third heater through the little steam turbine exhaust overflow of feed pump, when unusual backpressure appears, controls through discharge line or steam extraction steam supplementing pipeline to ensure that the backpressure of the little steam turbine of feed pump remains stable under various operating modes.
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 and the operation method, 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 foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic diagram of a steam extraction back pressure feedwater pump turbine system according to 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 embodiments of the present invention is provided in connection with 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, it should be noted that, for those skilled in the art, many 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 (2)
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.
2. A method of operating the steam extraction back pressure feedwater pump turbine system of claim 1, comprising:
the small turbine of the feed water pump takes the driving steam extracted by the main turbine as a steam source, and drives the feed water pump through a feed water pump speed regulating device to carry out variable speed regulation on the feed water quantity;
heating the water supply in the first heater, the second heater and the third heater by extracting steam in the middle of the small steam turbine of the water supply pump, and performing regenerative steam extraction operation on the small steam turbine of the water supply pump;
the driving power of the small turbine of the water feeding pump is balanced by the small power balance generator after the power for driving the water feeding pump and the middle steam extraction heat return is deducted;
the back pressure control of normal operation is carried out to the third heater through the little steam turbine exhaust overflow of feed pump, when unusual backpressure appears, controls through discharge line or steam extraction steam supplementing pipeline to ensure that the backpressure of the little steam turbine of feed pump remains stable under various operating modes.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115788602A (en) * | 2021-09-10 | 2023-03-14 | 上海电气电站设备有限公司 | Back pressure control thermodynamic system and control method for water supply pump steam turbine |
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