CN210889048U - High-parameter secondary reheating thermal system with two-stage hybrid heater configuration - Google Patents
High-parameter secondary reheating thermal system with two-stage hybrid heater configuration Download PDFInfo
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- CN210889048U CN210889048U CN201921250876.6U CN201921250876U CN210889048U CN 210889048 U CN210889048 U CN 210889048U CN 201921250876 U CN201921250876 U CN 201921250876U CN 210889048 U CN210889048 U CN 210889048U
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Abstract
The utility model relates to a high parameter secondary reheating thermodynamic system configured with a two-stage mixed heater, wherein a middle steam extraction pipeline of a main steam turbine of the system is connected with a steam inlet of a small steam turbine; the middle steam extraction pipeline of the small steam turbine is connected with the steam inlet of the first mixed heater; the steam exhaust pipeline of the small steam turbine is connected with the steam inlet of the second mixed heater; the outlet end of the first mixed heater is connected with the inlet end of the feed pump through a pipeline; the outlet end of the condensate booster pump is connected with the inlet end of the first mixed heater through a pipeline; the outlet end of the second mixed heater is connected with the inlet end of the condensed water booster pump through a pipeline. The utility model discloses a two-stage hybrid heater compares traditional one-level hybrid heater and can reduce the heat rate on the one hand, and on the other hand can improve the accuracy nature of the little steam turbine backpressure control of steam extraction back pressure formula, improves the reliability of system, retrieves the exhaust steam heat when the backpressure is adjusted simultaneously, can ensure that the efficiency of little steam turbine is up to 90%.
Description
Technical Field
The utility model belongs to the technical field of thermal power, especially, relate to a high parameter secondary reheating thermodynamic system of two-stage hybrid heater configuration.
Background
The circulating heat efficiency of the high-parameter millions of ultra-supercritical units can reach more than 48%, the high-parameter ultra-supercritical units have good energy-saving and emission-reducing benefits, and the high-parameter ultra-supercritical units with the main steam parameter grade of 35MPa become a research trend.
Aiming at the ultra-supercritical secondary reheating turbine unit with high parameter of millions and more than 35MPa and 630 ℃, the superheat degree of extracted steam at a high and medium pressure end is increased more due to the improvement of parameters of main steam and reheated steam, and the design and the model selection of a thermodynamic system need to be fully considered and optimized.
On the premise of improving the new steam parameters, conditions are provided for adding the regenerative heaters to the thermal system, but how to set the number and the types of the regenerative heaters needs to be further researched.
For a high-parameter secondary reheating ultra-supercritical unit provided with a small steam extraction back pressure turbine, the flexibility of the design of a thermodynamic system is increased, and the difficulty of configuration and type selection of a regenerative heater is also increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a high parameter secondary reheating thermodynamic system of two-stage hybrid heater configuration can match the little steam turbine of steam extraction back pressure type and carry out the optimal design and the heater lectotype of whole backheating thermodynamic system.
The utility model provides a high-parameter secondary reheating thermal system configured by a two-stage mixed heater, which comprises a high-parameter secondary reheating main turbine, a steam extraction back pressure type small turbine of a water feeding pump, a first mixed heater, a second mixed heater, a water feeding pump and a condensate booster pump;
the middle steam extraction pipeline of the high-parameter double reheating main steam turbine is connected with the steam inlet of a small steam turbine of a water feeding pump steam extraction back pressure type; the middle steam extraction pipeline of the water feeding pump steam extraction back pressure type small steam turbine is connected with the steam inlet of the first mixed heater; the steam exhaust pipeline of the water feeding pump steam extraction back pressure type small steam turbine is connected with the steam inlet of the second mixed heater; the outlet end of the first mixed heater is connected with the inlet end of the feed pump through a pipeline; the outlet end of the condensate booster pump is connected with the inlet end of the first mixed heater through a pipeline; the outlet end of the second mixed heater is connected with the inlet end of the condensed water booster pump through a pipeline.
Furthermore, the feed pump and the condensate booster pump adopt a variable-speed design.
By means of the scheme, the high-parameter secondary reheating thermal system configured by the two-stage mixed heater adopts the two-stage mixed heater, on one hand, compared with the traditional one-stage mixed heater, the heat consumption rate can be reduced by 15 kilojoules/kilowatt, on the other hand, the accuracy of back pressure control of the small steam turbine with the steam extraction back pressure can be improved, the reliability of the system is improved, meanwhile, the steam exhaust heat during back pressure regulation is recycled, and the efficiency of the small steam turbine can be ensured to be up to 90%.
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 a high-parameter secondary reheat thermal system configured with a two-stage hybrid heater according to the present invention.
Reference numbers in the figures:
1-high parameter double reheat main turbine; 2-a small steam turbine of a back pressure type for steam extraction of a water supply pump; 3-first hybrid heater 4-second hybrid heater 4; 5-a water supply pump; 6-condensate booster pump 6.
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 high-parameter secondary reheating thermal system configured by a two-stage hybrid heater, which includes a high-parameter secondary reheating main turbine 1, a water-feeding pump steam-extraction back-pressure small turbine 2, a first hybrid heater 3, a second hybrid heater 4, a water-feeding pump 5 and a condensate booster pump 6;
the middle steam extraction pipeline of the high-parameter double-reheating main turbine 1 is connected with the steam inlet of the steam extraction back-pressure type small turbine 2 of the water feeding pump; the middle steam extraction pipeline of the water feeding pump steam extraction back pressure type small steam turbine 2 is connected with the steam inlet of the first mixed heater 3; the steam exhaust pipeline of the water feeding pump steam extraction back pressure type small steam turbine 2 is connected with the steam inlet of the second mixed heater 4; the outlet end of the first mixed heater 3 is connected with the inlet end of a water feeding pump 5 through a pipeline; the outlet end of the condensate booster pump 6 is connected with the inlet end of the first mixed heater 3 through a pipeline; the outlet end of the second hybrid heater 4 is connected with the inlet end of the condensate booster pump 6 through a pipeline.
The operation method of the steam extraction back pressure type water feeding pump steam turbine set system comprises the following steps:
the two-stage hybrid heaters (a first hybrid heater 3 and a second hybrid heater 4) of the system are arranged on the middle heat recovery section of a steam extraction back-pressure type small steam turbine 2 of a water supply pump of a thermodynamic system of a high-parameter secondary reheating unit. The first mixed heater 3 is used as a deaerator function of the whole thermodynamic system, and the second mixed heater 4 is used for recovering the exhaust steam heat of the steam extraction backpressure small steam turbine 2 of the water supply pump and controlling the backpressure.
The water feeding pump steam extraction back pressure type small turbine 2 is driven by the middle steam extraction of the high-parameter secondary reheating main turbine 1, the proportion of the driving steam flow in the main steam flow is about 25%, the driving steam pressure is about 13MPa, and the temperature is about 450 ℃. In normal operation, in order to meet the requirement of partial load change, the feed pump 5 and the condensate booster pump 6 need to adopt variable-speed design.
The first mixed heater 3 is used as a deaerator, the steam extracted from the middle of the steam extraction backpressure small steam turbine 2 of the water supply pump enters the first mixed heater 3 and then is directly mixed and exchanged with the water supply in the first mixed heater, the oxygen amount of the water supply of a thermodynamic system can be ensured to be in a qualified level, and meanwhile, the mixed heater is adopted, so that the irreversible loss in the heat exchange process can be reduced to the maximum extent. The steam admission pressure of the first mixed heater 3 is 1MPa, and the steam admission temperature is 180 ℃.
The second mixed heater 4 is used as a recovery device for the exhaust mass heat of the water supply pump extraction back pressure small turbine 2, and the exhaust steam of the water supply pump extraction back pressure small turbine 2 enters the second mixed heater 4 and then is directly mixed with condensed water in the second mixed heater for heat exchange, so that the second mixed heater has the function of a condenser of a back pressure unit, and the second mixed heater can reduce the irreversible loss in the heat exchange process. The steam admission pressure of the second mixed heater 4 is 0.5MPa, and the steam admission temperature is 150 ℃.
The utility model discloses a two-stage hybrid heater compares on the one hand that traditional one-level hybrid heater can reduce the heat rate 15 kilojoules when kilowatts, and on the other hand can improve the accuracy nature of the little steam turbine backpressure control of steam extraction back pressure formula, improves the reliability of system, retrieves the exhaust steam heat when the backpressure is adjusted simultaneously, can ensure that the efficiency of little steam turbine is up to 90%.
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 (2)
1. A high-parameter secondary reheating thermal system configured by a two-stage hybrid heater is characterized by comprising a high-parameter secondary reheating main turbine, a small steam turbine of a steam extraction back pressure type of a water feeding pump, a first hybrid heater, a second hybrid heater, a water feeding pump and a condensate booster pump;
the middle steam extraction pipeline of the high-parameter double reheating main steam turbine is connected with the steam inlet of the small steam turbine of the water feeding pump steam extraction back pressure type; the middle steam extraction pipeline of the water feeding pump steam extraction back pressure type small steam turbine is connected with the steam inlet of the first mixed heater; the steam exhaust pipeline of the water feeding pump steam extraction back pressure type small steam turbine is connected with the steam inlet of the second mixed heater; the outlet end of the first mixed heater is connected with the inlet end of the feed water pump through a pipeline; the outlet end of the condensate booster pump is connected with the inlet end of the first mixed heater through a pipeline; and the outlet end of the second mixed heater is connected with the inlet end of the condensed water booster pump through a pipeline.
2. The two-stage hybrid heater configured high parameter secondary reheat thermodynamic system of claim 1, wherein the feedwater pump and the condensate booster pump are of a variable speed design.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921250876.6U CN210889048U8 (en) | 2019-08-01 | 2019-08-01 | High-parameter secondary reheating thermal system with two-stage hybrid heater configuration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921250876.6U CN210889048U8 (en) | 2019-08-01 | 2019-08-01 | High-parameter secondary reheating thermal system with two-stage hybrid heater configuration |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN210889048U true CN210889048U (en) | 2020-06-30 |
| CN210889048U8 CN210889048U8 (en) | 2020-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921250876.6U Expired - Fee Related CN210889048U8 (en) | 2019-08-01 | 2019-08-01 | High-parameter secondary reheating thermal system with two-stage hybrid heater configuration |
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| CN (1) | CN210889048U8 (en) |
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2019
- 2019-08-01 CN CN201921250876.6U patent/CN210889048U8/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CU01 | Correction of utility model |
Correction item: Patentee|Address|Patentee Correct: DATANG YUNCHENG POWER GENERATION Co.,Ltd.|274799, 14th Floor, Xinghe International Office Building, Dongxi Road, Yuncheng County, Heze City, Shandong Province|Thermal Power Technology Research Institute of China Datang Group Science and Technology Research Institute Co., Ltd. False: DATANG YUNCHENG POWER GENERATION Co.,Ltd.|274799, 14th Floor, Xinghe International Office Building, Dongxi Road, Yuncheng County, Heze City, Shandong Province|Thermal Power Technology Research Institute of China Datang Group Science and Technology Research Institute Co., Ltd. Number: 27-01 Page: The title page Volume: 36 Correction item: Patentee|Address|Patentee Correct: DATANG YUNCHENG POWER GENERATION Co.,Ltd.|274799, 14th Floor, Xinghe International Office Building, Dongxi Road, Yuncheng County, Heze City, Shandong Province|Thermal Power Technology Research Institute of China Datang Group Science and Technology Research Institute Co., Ltd. False: DATANG YUNCHENG POWER GENERATION Co.,Ltd.|274799, 14th Floor, Xinghe International Office Building, Dongxi Road, Yuncheng County, Heze City, Shandong Province|Thermal Power Technology Research Institute of China Datang Group Science and Technology Research Institute Co., Ltd. Number: 27-01 Volume: 36 |
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| CU01 | Correction of utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200630 Termination date: 20210801 |
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| CF01 | Termination of patent right due to non-payment of annual fee |