CN216044141U - High-water-head same-runner tandem type two-stage double-shaft mixed-flow generator set - Google Patents
High-water-head same-runner tandem type two-stage double-shaft mixed-flow generator set Download PDFInfo
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- CN216044141U CN216044141U CN202122027372.1U CN202122027372U CN216044141U CN 216044141 U CN216044141 U CN 216044141U CN 202122027372 U CN202122027372 U CN 202122027372U CN 216044141 U CN216044141 U CN 216044141U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model relates to a high-water-head same-flow-channel tandem type two-stage double-shaft mixed flow generator set which comprises a first-stage water-turbine generator set and a second-stage water-turbine generator set, wherein the first-stage water-turbine generator set and the second-stage water-turbine generator set are arranged in series front and back along the water flow direction in a factory building. The ultra-high water head water energy is efficiently and hierarchically absorbed through the secondary mixed-flow rotating wheel, so that the stable operation of the mixed-flow water turbine is ensured; meanwhile, the advantages of large capacity and high efficiency of the mixed-flow water turbine are utilized, and the single-machine capacity level and the overall power generation efficiency are improved. The double-shaft mode is adopted, the rotating speed and the capacity of the unit can be designed more flexibly, the characteristics of large capacity and high efficiency of the mixed-flow water turbine can be fully exerted, the rotating speed is more reasonable, the silt abrasion resistance performance is correspondingly better, the requirements of ultrahigh water head and ultrahigh capacity hydroenergy development conditions in western regions of China can be well met, and the operation management can be better adapted to power grid dispatching.
Description
Technical Field
The utility model relates to the technical field of hydroelectric power generation, in particular to a high-water-head same-runner tandem type two-stage double-shaft mixed flow generator set.
Background
Under high water head, especially more than 700m water head, the impulse turbine is generally adopted; however, as the impulse turbine runner is exposed out of the water surface and works under the atmospheric pressure, the jet velocity of the nozzle and the rotating speed of the bucket runner are high, and the single-machine capacity of the impulse turbine is limited by the size of the runner (the current maximum single-machine capacity of the impulse turbine is 423 MW). And when the water head is higher than 700m and the silt content of the river is large, the silt abrasion problem of the impulse turbine is serious, and the equipment maintenance period and the service life are greatly shortened.
The mixed-flow turbine works in the underwater flow channel completely, and has lower rotating speed and larger single-machine capacity (the maximum single-machine capacity is 1000MW at present). In addition, compared with an impulse type water turbine, the mixed flow type water turbine has higher efficiency and better silt resistance. However, the francis turbine runner has a water head range of 30-700 m due to the limitation of the operation stability range, and particularly under the condition of large capacity, after the water head exceeds 600m, the indexes such as the operation stability region and the manufacturing difficulty are rapidly deteriorated, so that reasonable type selection and manufacturing are difficult. The water head for developing river water energy in western regions of China is as high as 800-1000 m, the arrangement space of power stations and plants is limited due to the narrow river channel, the capacity of a single machine needs to reach 500-800 MW, and the capacity of the impulse water turbine and the water head of the mixed flow water turbine are greatly broken through by the two indexes.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a high-water-head and same-runner tandem type two-stage double-shaft mixed-flow water turbine generator set, which can be used for carrying out graded absorption on ultra-high water head water energy so as to obtain a two-stage mixed-flow water turbine generator set with a water head of more than 800m, a single-machine capacity of 800MW and a rated efficiency of more than 94%.
The technical scheme adopted by the utility model is as follows: the utility model provides a high water head, with flow passage serial-type doublestage biax mixed flow generating set which characterized in that: the water turbine generator set comprises a first-stage water turbine generator set and a second-stage water turbine generator set, wherein the first-stage water turbine generator set and the second-stage water turbine generator set are arranged in series in the plant along the water flow direction.
Preferably, a volute water inlet in the first-stage hydroelectric generating set is communicated with a power station water diversion system, and incoming water with a high water head enters a volute through the power station water diversion system and then enters a guide vane through the volute to drive a first-stage hydraulic turbine runner to perform first-stage energy dissipation power generation; and a volute water outlet in the first-stage water turbine generator set is communicated with a volute water inlet in the second-stage water turbine generator set to drive a second-stage water turbine runner to perform second-stage energy dissipation and power generation.
Furthermore, a volute water outlet in the first-stage water turbine generator set is communicated with a volute water inlet in the second-stage water turbine generator set through a draft tube and a pressure steel tube.
Preferably, the first-stage water turbine generator set and the second-stage water turbine generator set both adopt a first-stage mixed-flow water turbine generator set.
Preferably, the first-stage hydroelectric generating set and the second-stage hydroelectric generating set equally divide the total water head.
The beneficial effects obtained by the utility model are as follows: the ultra-high water head water energy is efficiently and hierarchically absorbed through the secondary mixed-flow rotating wheel, so that the stable operation of the mixed-flow water turbine is ensured; meanwhile, the advantages of large capacity and high efficiency of the mixed-flow water turbine are utilized, and the single-machine capacity level and the overall power generation efficiency are improved. The double-shaft mode is adopted, the rotating speed and the capacity of the unit can be designed more flexibly, the characteristics of large capacity and high efficiency of the mixed-flow water turbine can be fully exerted, the rotating speed is more reasonable, the silt abrasion resistance performance is correspondingly better, the requirements of ultrahigh water head and ultrahigh capacity hydroenergy development conditions in western regions of China can be well met, and the operation management can be better adapted to power grid dispatching.
Drawings
FIG. 1 is a schematic structural view of the present invention;
reference numerals: 1. a first stage hydro-turbo generator set; 2. a second stage hydro-turbo generator set; 3. a draft tube; 4. and (5) a pressure steel pipe.
Detailed Description
The utility model will be further described with reference to the following drawings and specific embodiments.
As shown in figure 1, the high-head same-runner serial two-stage double-shaft mixed flow generator set is arranged in a water head terrain larger than 800m and comprises a first-stage water turbine generator set 1 and a second-stage water turbine generator set 2, wherein the first-stage water turbine generator set 1 and the second-stage water turbine generator set 2 are arranged in series from front to back in a plant along the water flow direction to form serial connection of two stages of water turbine runners, so that the purpose of graded energy dissipation is achieved. The water pressure in the turbine draft tube 3 of the first-stage hydroelectric generating set is large, large upward water thrust is generated, and the design of a thrust bearing of the first-stage hydroelectric generating set needs to be designed and manufactured according to the forward and reverse bidirectional thrust.
In the embodiment, a volute water inlet in the first-stage hydroelectric generating set 1 is communicated with a power station water diversion system, and incoming water with a high water head enters a volute through the power station water diversion system and then enters a guide vane through the volute to drive a first-stage hydraulic turbine runner to perform first-stage energy dissipation and power generation; and a volute water outlet in the first-stage water turbine generator set 1 is communicated with a volute water inlet in the second-stage water turbine generator set 2 to drive a second-stage water turbine runner to perform second-stage energy dissipation and power generation. Under the normal operating condition, the first-stage water turbine runner and the second-stage water turbine runner equally divide the whole water head, namely respectively bear 50% of the water head.
In this embodiment, the water distributors of the first-stage water turbine generator set 1 and the second-stage water turbine generator set 2 can be controlled independently, and can also be operated in a coordinated manner, so that the opening degree of the guide vane can be controlled according to the load and the water head change.
In this embodiment, a volute water outlet in the first-stage hydro-turbo generator set 1 is communicated with a volute water inlet in the second-stage hydro-turbo generator set 2 through a draft tube 3 and a pressure steel tube 4.
In this embodiment, the first-stage water turbine generator set 1 and the second-stage water turbine generator set 2 both adopt a first-stage mixed-flow water turbine generator set.
The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which fall within the scope of the claimed invention. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a high water head, with flow passage serial-type doublestage biax mixed flow generating set which characterized in that: the water turbine generator set comprises a first-stage water turbine generator set and a second-stage water turbine generator set, wherein the first-stage water turbine generator set and the second-stage water turbine generator set are arranged in series in the plant along the water flow direction.
2. The high head, co-channel tandem two stage dual shaft mixed flow generator set of claim 1, wherein: the water inlet of the volute in the first-stage hydroelectric generating set is communicated with a power station water diversion system, and incoming water with a high water head enters the volute through the power station water diversion system and then enters the guide vane through the volute to drive the runner of the first-stage hydraulic turbine so as to perform first-stage energy dissipation and power generation; and a volute water outlet in the first-stage water turbine generator set is communicated with a volute water inlet in the second-stage water turbine generator set to drive a second-stage water turbine runner to perform second-stage energy dissipation and power generation.
3. The high-head, co-runner, tandem two-stage double-shaft mixed flow generator set of claim 2, wherein: and a volute water outlet in the first-stage water-turbine generator set is communicated with a volute water inlet in the second-stage water-turbine generator set through a draft tube and a pressure steel tube.
4. The high head, co-channel tandem two stage dual shaft mixed flow generator set of claim 1, wherein: the first-stage water turbine generator set and the second-stage water turbine generator set both adopt first-stage mixed-flow water turbine generator sets.
5. The high head, co-channel tandem two-stage double-shaft mixed flow generator set according to any one of claims 1 to 4, characterized in that: the first-stage water turbine generator set and the second-stage water turbine generator set equally divide the whole water head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122027372.1U CN216044141U (en) | 2021-08-26 | 2021-08-26 | High-water-head same-runner tandem type two-stage double-shaft mixed-flow generator set |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122027372.1U CN216044141U (en) | 2021-08-26 | 2021-08-26 | High-water-head same-runner tandem type two-stage double-shaft mixed-flow generator set |
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| CN216044141U true CN216044141U (en) | 2022-03-15 |
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| CN202122027372.1U Active CN216044141U (en) | 2021-08-26 | 2021-08-26 | High-water-head same-runner tandem type two-stage double-shaft mixed-flow generator set |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992031A (en) * | 2022-05-24 | 2022-09-02 | 宁德市上白石水利枢纽工程有限公司 | Mixed flow water turbine |
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2021
- 2021-08-26 CN CN202122027372.1U patent/CN216044141U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992031A (en) * | 2022-05-24 | 2022-09-02 | 宁德市上白石水利枢纽工程有限公司 | Mixed flow water turbine |
| NL2032831B1 (en) * | 2022-05-24 | 2023-12-07 | Ningde Shangbaishi Water Conservancy Project Co Ltd | Francis turbine |
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