CN210317631U - Steam turbine set of power station - Google Patents
Steam turbine set of power station Download PDFInfo
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- CN210317631U CN210317631U CN201921277255.7U CN201921277255U CN210317631U CN 210317631 U CN210317631 U CN 210317631U CN 201921277255 U CN201921277255 U CN 201921277255U CN 210317631 U CN210317631 U CN 210317631U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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Abstract
The utility model discloses technical scheme discloses a turbine unit of power station, including solar heat exchanger group, steam brayton cycle and steam rankine cycle, solar heat exchanger group is including first over heater, first reheater, second over heater and second reheater, steam brayton cycle includes compressor, regenerator, high pressure turbine, middle heat exchanger and first generator, steam rankine cycle includes condensate pump, low pressure feed water heater, oxygen-eliminating device, water-feeding pump, high pressure feed water heater, middling pressure turbine, low pressure turbine, condenser and second generator. The utility model discloses technical scheme's steam turbine unit is through combining brayton cycle and rankine cycle organically, can show the thermal efficiency that promotes rankine cycle on the one hand, and on the other hand is very big through high-pressure turbine's working medium flow, and high-pressure turbine's interior efficiency promotes, ensures brayton cycle's thermal efficiency, finally makes the thermal efficiency of whole unit show and promotes.
Description
Technical Field
The utility model relates to a solar energy power generation technical field especially relates to a turbine unit in power station.
Background
In the tower-type solar photo-thermal power station, the performance of the steam turbine set plays a key role in the power generation efficiency of the power station, and the circulating heat efficiency of the steam turbine set is required to be as high as possible, so that the power generation cost of the power station is reduced. The capacity of the existing steam turbine set for the tower type solar photo-thermal power station is 10-150 MW, and the parameter range is as follows: the pressure is 12-16.5 MPa, and the temperature is 520-585 ℃. Generally, the capacity and parameters of a steam turbine unit of a tower-type solar photo-thermal power station are lower than those of the existing subcritical thermal power unit, and are further lower than those of the supercritical and ultra-supercritical thermal power units. Therefore, the cycle thermal efficiency of the steam turbine set of the tower-type solar photo-thermal power station is not high, on one hand, parameters need to be improved, and on the other hand, the existing steam turbine set needs to be improved, so that the power generation efficiency of the power station is improved.
The existing methods for improving the cycle thermal efficiency of the steam turbine set are various, including reheating, afterburning and other energy-saving and consumption-reducing measures, so that the generating efficiency of the set can be obviously improved. However, a technical bottleneck is encountered to further improve the unit efficiency. In view of the above, those skilled in the art are dedicated to developing a new turbine set for tower-type solar photo-thermal power generation, which again improves the efficiency of the turbine set at the present level.
SUMMERY OF THE UTILITY MODEL
In view of the above shortcoming of the prior art, the to-be-solved technical problem of the utility model is to provide a turbine unit based on tower solar photothermal power station.
In order to solve the technical problem, the utility model provides a steam turbine set of a power station, which comprises a solar heat exchanger set, a steam Brayton cycle and a steam Rankine cycle;
the solar heat exchanger group comprises a first superheater, a first reheater, a second superheater and a second reheater;
the steam Brayton cycle comprises a compressor, a heat regenerator, a high-pressure turbine, an intermediate heat exchanger and a first generator, wherein an outlet of the compressor is connected with a low-temperature side inlet of the heat regenerator, a low-temperature side outlet of the heat regenerator is connected with an inlet of the first superheater, an outlet of the first superheater is connected with an inlet of the high-pressure turbine, an outlet of the high-pressure turbine is connected with an inlet of the first reheater, an outlet of the first reheater is connected with a high-temperature side inlet of the heat regenerator, a high-temperature side outlet of the heat regenerator is connected with a high-temperature side inlet of the intermediate heat exchanger, and a high-temperature side outlet of the intermediate heat exchanger is connected with an inlet of the;
the steam Rankine cycle comprises a condensate pump, a low-pressure heater, a deaerator, a water feed pump, a high-pressure heater, a medium-pressure turbine, a low-pressure turbine, a condenser and a second generator, wherein an outlet of the condensate pump is connected with an inlet of the low-pressure heater, an outlet of the low-pressure heater is connected with an inlet of the deaerator, an outlet of the deaerator is connected with an inlet of the water feed pump, an outlet of the water feed pump is connected with an inlet of the high-pressure heater, an outlet of the high-pressure heater is connected with a low-temperature side inlet of the intermediate heat exchanger, a low-temperature side outlet of the intermediate heat exchanger is connected with an inlet of the second superheater, an outlet of the second superheater is connected with an inlet of the first superheater, an outlet of the first superheater is connected with an inlet of the high-pressure, the outlet of the first reheater is connected with the inlet of the medium-pressure turbine, the outlet of the medium-pressure turbine is connected with the inlet of the second reheater, the outlet of the second reheater is connected with the inlet of the low-pressure turbine, the outlet of the low-pressure turbine is connected with the working medium inlet of the condenser, and the working medium outlet of the condenser is connected with the inlet of the condensate pump.
Optionally, the high pressure turbine, the compressor and the first generator are arranged coaxially.
Optionally, the intermediate pressure turbine, the low pressure turbine and the second generator are arranged coaxially.
Optionally, the steam turbine set of the power station further includes a heat collection system, and the heat collection system is connected to the solar heat exchanger and provides heat for the steam brayton cycle and the steam rankine cycle.
Optionally, the heat collecting system is a light-gathering heat collecting system.
Optionally, the steam turbine set of the power plant further includes a first steam extraction pipeline, and the first steam extraction pipeline is connected with the medium-pressure turbine and the high-pressure heater.
Optionally, the steam turbine set of the power plant further includes a second steam extraction pipeline, and the second steam extraction pipeline is connected to the low-pressure steam turbine and the low-pressure heater.
Optionally, the steam turbine set of the power plant further includes a third steam extraction pipeline, and the third steam extraction pipeline is connected to the low-pressure turbine and the deaerator.
Compared with the prior art, the utility model discloses technical scheme's steam turbine group at power station has following beneficial effect:
on the premise of not improving the temperature parameter of the unit, the Brayton cycle and the Rankine cycle are organically combined, so that on one hand, the thermal efficiency of the Rankine cycle can be obviously improved, on the other hand, the flow of the working medium passing through the high-pressure turbine is very large, the internal efficiency of the high-pressure turbine is improved, the thermal efficiency of the Brayton cycle is ensured, and finally, the thermal efficiency of the whole unit is obviously improved.
Drawings
Fig. 1 is a schematic structural view of a steam turbine set of a power station according to an embodiment of the present invention;
wherein: 1-a first superheater, 2-a first reheater, 3-a second superheater, 4-a second reheater, 11-a compressor, 12-a reheater, 13-a high pressure turbine, 14-an intermediate heat exchanger, 15-a first generator, 21-a condensate pump, 22-a low pressure heater, 23-a deaerator, 24-a water feed pump, 25-a high pressure heater, 26-an intermediate pressure turbine, 27-a low pressure turbine, 28-a condenser, 29-a second generator, 30-a first steam extraction pipeline, 31-a second steam extraction pipeline, and 32-a third steam extraction pipeline.
Detailed Description
The technical solution of the present invention will be described in detail with reference to the following examples.
As shown in fig. 1, a steam turbine set of a power plant according to an embodiment of the present invention includes a solar heat exchanger set, a steam brayton cycle, and a steam rankine cycle.
The solar heat exchanger group comprises a first superheater 1, a first reheater 2, a second superheater 3 and a second reheater 4.
The steam Brayton cycle comprises a compressor 11, a heat regenerator 12, a high-pressure turbine 13, an intermediate heat exchanger 14 and a first generator 15, wherein an outlet of the compressor 11 is connected with a low-temperature side inlet of the heat regenerator 12, a low-temperature side outlet of the heat regenerator 12 is connected with an inlet of a first superheater 1, an outlet of the first superheater 1 is connected with an inlet of the high-pressure turbine 13, an outlet of the high-pressure turbine 13 is connected with an inlet of a first reheater 2, an outlet of the first reheater 2 is connected with a high-temperature side inlet of the heat regenerator 12, a high-temperature side outlet of the heat regenerator 12 is connected with a high-temperature side inlet of the intermediate heat exchanger 14, and a high-temperature side.
The steam Rankine cycle comprises a condensate pump 21, a low-pressure heater 22, a deaerator 23, a water feed pump 24, a high-pressure heater 25, a medium-pressure turbine 26, a low-pressure turbine 27, a condenser 28 and a second generator 29, wherein an outlet of the condensate pump 21 is connected with an inlet of the low-pressure heater 22, an outlet of the low-pressure heater 22 is connected with an inlet of the deaerator 23, an outlet of the deaerator 23 is connected with an inlet of the water feed pump 24, an outlet of the water feed pump 24 is connected with an inlet of the high-pressure heater 25, an outlet of the high-pressure heater 25 is connected with a low-temperature side inlet of an intermediate heat exchanger 14, a low-temperature side outlet of the intermediate heat exchanger 14 is connected with an inlet of a second superheater 3, an outlet of the second superheater 3 is connected with an inlet of a first superheater 1, an outlet of the first superheater 1 is connected with an inlet of a high-pressure turbine 13, an outlet of the medium-pressure turbine 26 is connected with an inlet of the second reheater 4, an outlet of the second reheater 4 is connected with an inlet of the low-pressure turbine 27, an outlet of the low-pressure turbine 27 is connected with a working medium inlet of the condenser 28, and a working medium outlet of the condenser 28 is connected with an inlet of the condensate pump 21.
In the actual arrangement of the respective devices, the high-pressure turbine 13 and the compressor 11 are arranged coaxially with the first generator 15, and the intermediate-pressure turbine 26, the low-pressure turbine 27, and the second generator 29 are arranged coaxially.
The heat of the steam Brayton cycle and the steam Rankine cycle is provided by a heat collecting system which is connected with a solar heat exchanger, and the heat is continuously provided for the steam Brayton cycle and the steam Rankine cycle through a first superheater 1, a first reheater 2, a second superheater 3 and a second reheater 4 of the solar heat exchanger group. The embodiment of the utility model provides an adopt is spotlight thermal-arrest system.
It should be noted that when the solar energy light and heat input intensity is low or the heat storage heat is adopted for power generation at night, the first superheater 1 and the steam brayton cycle can be cut off, the low-temperature side inlet of the intermediate heat exchanger 14 and the low-temperature side outlet of the intermediate heat exchanger 14 are directly communicated through a bypass, the outlet of the second superheater 3 and the inlet of the first reheater 2 are directly communicated through a bypass, and the unit generates power only through the steam rankine cycle.
In addition, the steam turbine set of this embodiment is further provided with a first steam extraction pipeline 30, a second steam extraction pipeline 31 and a third steam extraction pipeline 32, wherein the first steam extraction pipeline 30 is connected with the intermediate-pressure turbine 26 and the high-pressure heater 25, the intermediate-pressure turbine 26 supplies heat to the high-pressure heater 25 through the first steam extraction pipeline 30, the second steam extraction pipeline 31 is connected with the low-pressure turbine 27 and the low-pressure heater 22, the low-pressure turbine 27 supplies heat to the low-pressure heater 22 through the second steam extraction pipeline 31, the third steam extraction pipeline 32 is connected with the low-pressure turbine 27 and the deaerator 23, and the low-pressure turbine 27 supplies heat to the deaerator 23 through the third steam extraction pipeline 32.
It should be noted that, the utility model discloses the equipment that technical scheme related is existing equipment, in this embodiment, specifically adopts following equipment: the system comprises a first superheater (stainless steel tube type superheater), a first reheater (stainless steel tube type superheater), a second superheater (stainless steel tube type superheater), a second reheater (stainless steel tube type superheater), a compressor (axial flow steam compressor), a reheater (printed circuit board heat exchanger), a high-pressure turbine (high-pressure turbine), an intermediate heat exchanger (shell-and-tube heat exchanger), a first generator (three-phase alternating current synchronous generator), a condensate pump (centrifugal pump), a low-pressure heater (shell-and-tube heat exchanger), a deaerator (thermal deaerator), a water feed pump (centrifugal pump), a high-pressure heater (shell-and-tube heat exchanger), an intermediate-pressure turbine (intermediate-pressure turbine), a low-pressure turbine (low-pressure turbine), a condenser (water-cooled condenser), and a second.
The steam turbine set of the power station works according to the following method:
in the steam Brayton cycle, a working medium enters a compressor 11 for pressurization, the working medium at the outlet of the compressor 11 absorbs the heat of the working medium discharged by a high-pressure turbine 13 through a heat regenerator 12, then enters a first superheater 1 for absorbing the heat to reach 540 ℃, has the pressure of 20Mpa, enters the high-pressure turbine 13 for expansion and work, releases the heat through the heat regenerator 12, releases the heat to 345 ℃ through an intermediate heat exchanger 14, has the pressure of 15Mpa, and returns to the compressor 11.
In a steam Rankine cycle, a condensate pump 21 sends water into a low-pressure heater 22 for heating, then the water enters a deaerator 23, then the water is sent into a high-pressure heater 25 for heating through a water feeding pump 24, then the water enters an intermediate heat exchanger 14 for heating, then the water is heated to 540 ℃ through a second superheater 3 and a first superheater 1, the pressure is 20MPa, then the water enters a high-pressure turbine 13 for expansion work, the exhaust steam of the high-pressure turbine 13 is heated to 540 ℃ through a first reheater 2, the pressure is 14MPa, then the exhaust steam enters a medium-pressure turbine 26 for work, the exhaust steam of the medium-pressure turbine 26 is heated through a second reheater 4, then the exhaust steam enters a low-pressure turbine 27 for work.
When the solar energy photo-thermal input intensity is low or the heat storage heat is adopted for power generation at night, the first superheater 1 and the steam Brayton cycle can be cut off, the inlet and the outlet of the low-temperature side of the intermediate heat exchanger 14 are directly communicated through a bypass, the outlet of the second superheater 3 and the inlet of the first reheater 2 are directly communicated through the bypass, and the unit generates power only through the steam Rankine cycle.
The medium-pressure turbine 26 supplies heat to the high-pressure heater 25 via a first extraction line 30, the low-pressure turbine 27 supplies heat to the low-pressure heater 22 via a second extraction line 31, and the low-pressure turbine 27 supplies heat to the deaerator 23 via a third extraction line 32.
When the efficiency of the compressor 11 is 82% and the efficiency of the high-pressure turbine 13 is 90%, the cycle thermal efficiency of the unit adopting the embodiment under the rated working condition is improved by about 2% compared with the original unit with the parameter of 14MPa/540 ℃, and the thermal efficiency of the embodiment can be improved by about 3% along with further improvement of the equipment performance.
While specific embodiments of the present invention have been described in detail, it will be appreciated that modifications and variations can be made by persons skilled in the art in light of the above teachings without inventive faculty. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. A steam turbine set of a power station is characterized by comprising a solar heat exchanger set, a steam Brayton cycle and a steam Rankine cycle;
the solar heat exchanger group comprises a first superheater, a first reheater, a second superheater and a second reheater;
the steam Brayton cycle comprises a compressor, a heat regenerator, a high-pressure turbine, an intermediate heat exchanger and a first generator, wherein an outlet of the compressor is connected with a low-temperature side inlet of the heat regenerator, a low-temperature side outlet of the heat regenerator is connected with an inlet of the first superheater, an outlet of the first superheater is connected with an inlet of the high-pressure turbine, an outlet of the high-pressure turbine is connected with an inlet of the first reheater, an outlet of the first reheater is connected with a high-temperature side inlet of the heat regenerator, a high-temperature side outlet of the heat regenerator is connected with a high-temperature side inlet of the intermediate heat exchanger, and a high-temperature side outlet of the intermediate heat exchanger is connected with an inlet of the;
the steam Rankine cycle comprises a condensate pump, a low-pressure heater, a deaerator, a water feed pump, a high-pressure heater, a medium-pressure turbine, a low-pressure turbine, a condenser and a second generator, wherein an outlet of the condensate pump is connected with an inlet of the low-pressure heater, an outlet of the low-pressure heater is connected with an inlet of the deaerator, an outlet of the deaerator is connected with an inlet of the water feed pump, an outlet of the water feed pump is connected with an inlet of the high-pressure heater, an outlet of the high-pressure heater is connected with a low-temperature side inlet of the intermediate heat exchanger, a low-temperature side outlet of the intermediate heat exchanger is connected with an inlet of the second superheater, an outlet of the second superheater is connected with an inlet of the first superheater, an outlet of the first superheater is connected with an inlet of the high-pressure, the outlet of the first reheater is connected with the inlet of the medium-pressure turbine, the outlet of the medium-pressure turbine is connected with the inlet of the second reheater, the outlet of the second reheater is connected with the inlet of the low-pressure turbine, the outlet of the low-pressure turbine is connected with the working medium inlet of the condenser, and the working medium outlet of the condenser is connected with the inlet of the condensate pump.
2. The power plant turboset according to claim 1, characterized in that the high-pressure turbine, the compressor and the first generator are arranged coaxially.
3. The power plant turboset of claim 1, characterized in that the intermediate-pressure turbine, the low-pressure turbine and the second generator are arranged coaxially.
4. The steam turbine plant of a power plant of claim 1, further comprising a heat collection system coupled to the solar heat exchanger bank to provide heat for the steam brayton cycle and the steam rankine cycle.
5. The turboset of a power generating station of claim 4, wherein the heat collection system is a concentrator heat collection system.
6. The power plant turboset of claim 1, further comprising a first extraction conduit connecting the intermediate pressure turbine and the high pressure heater.
7. The power plant turboset of claim 1, further comprising a second extraction conduit connecting the low pressure turbine and the low pressure heater.
8. The power plant turboset of claim 1, further comprising a third extraction conduit connecting the low pressure turbine and the deaerator.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921277255.7U CN210317631U (en) | 2019-08-05 | 2019-08-05 | Steam turbine set of power station |
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| CN201921277255.7U CN210317631U (en) | 2019-08-05 | 2019-08-05 | Steam turbine set of power station |
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| CN210317631U true CN210317631U (en) | 2020-04-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318961A (en) * | 2019-08-05 | 2019-10-11 | 上海发电设备成套设计研究院有限责任公司 | A kind of Steam Turbine and its electricity-generating method in power station |
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2019
- 2019-08-05 CN CN201921277255.7U patent/CN210317631U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110318961A (en) * | 2019-08-05 | 2019-10-11 | 上海发电设备成套设计研究院有限责任公司 | A kind of Steam Turbine and its electricity-generating method in power station |
| CN110318961B (en) * | 2019-08-05 | 2023-10-17 | 上海发电设备成套设计研究院有限责任公司 | Steam turbine set of power station and power generation method thereof |
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