CN103047077A - Device and method for inner tube flow control of impulse turbine - Google Patents
Device and method for inner tube flow control of impulse turbine Download PDFInfo
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- CN103047077A CN103047077A CN2013100247620A CN201310024762A CN103047077A CN 103047077 A CN103047077 A CN 103047077A CN 2013100247620 A CN2013100247620 A CN 2013100247620A CN 201310024762 A CN201310024762 A CN 201310024762A CN 103047077 A CN103047077 A CN 103047077A
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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
- Y02E10/20—Hydro energy
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Abstract
A flow control device 7 is installed on the periphery of a turbine rotating wheel 5 and is connected with an outer tube 12 of the flow control device 7 through a support rod 8 to fix the flow control device 7 on second-stage concrete 9 of a plant. The flow control device is not connected with the turbine. Adjusting function of an outer adjusting mechanism in the existing unit is replaced by adjusting size of a flow adjusting hole 10 on the flow control device 7 to achieve double adjustment of the impulse turbine. In design of a hydropower station, diversion system pressure adjusting well design can be removed, or size of a pressure adjusting well can be effectively reduced to optimize engineering design and reduce engineering investment cost. The device and the method have the advantages that the flow control device 7 controls each nozzle simultaneously to rotate an inner tube 11 to control flow. The flow control device is composed of the inner tube and the outer tube which are concentric, the outer tube 12 is fixed, the inner tube 11 rotates to conduct adjustment, and the device is simple in structure.
Description
Technical field
The invention belongs to the hydraulic machinery engineering, particularly a kind of impulse turbine inner core control flow meter and method.
Background technique
The regulatory function of impulse turbine speed regulator, the same with axial-flow Kaplan (containing diagonal flow type, tubular) water turbine, need to carry out dual regulation, namely nozzle and outer adjusting mechanism (jet deflector or shunt) are regulated simultaneously, and keep predetermined joint to concern, to realize the flow control to runner, satisfy rotational speed of water turbine and the automatic adjusting of exerting oneself.Therefore, for the speed regulator of above-mentioned form water turbine, unexceptional employing dual regulation modes all.Because impulse turbine generally is middle-size and small-size; single-machine capacity is mostly all below 30 MW; the operation and these units all are connected to the grid; its single-machine capacity accounts for installed capacity in power grid mostly all below 10%; the stability of unit operation is less to electric network influencing; the outer adjusting mechanism (jet deflector or shunt) in the impulse turbine regulating system particularly; adjusting to unit brings noise; vibration (Fig. 1; Fig. 2 regulates mechanism's (jet deflector or shunt) 1 outward and is installed in the termination of nozzle 3; be subjected to nozzle 3 to stretch into the cantilever effect of runner envelope 4; produce very large vibration and noise to unit after outer adjusting mechanism (jet deflector or shunt) 1 devotes oneself to work) etc. practical problem; and the collision of the current that are folded to or shunt by runner envelope is difficult to reach by experiment theoretically determine it also is the theoretical question of impact type unit dual regulation to the secondary action of runner; therefore; many middle-size and small-size impulse turbines that newly manufacture and design are in order to reduce the problems referred to above to the impact of unit operation; clearly the function of accident protection is only undertaken by outer adjusting mechanism (jet deflector or shunt); do not participate in the adjusting of water turbine; also just no longer keep the joint relation with the nozzle needle switch; only outside unit load has large variation (rising rate of rolational speed of generating set or drop to certain value), regulate mechanism's (jet deflector or shunt) rapidly (being generally 2～3 s) block current or unlatching, current are blocked rapidly in the outer mechanism's (jet deflector or shunt) that regulates during load rejection.Along with the development of this several years home and abroad high head impact units, single-machine capacity has reached 187.5MW, and the proportion that occupies in the electrical network that has is increasing, and the problem that such adjusting brings will be more and more outstanding, main problem:
1, in electrical network, occupies proportion when larger when such unit capacity, the performance of unit is extremely unstable, can cause the unstable accidents caused of electric power system. such as high bridge power station, Yunnan three vertical four nozzle impact type hydraulic turbine groups are installed, single-machine capacity 30 MW, rated head 550 m, rated speed 600 r/min.Water turbine has adopted the import runner, is furnished with domestic CJWJ one 4/1-63 type, microcomputer (PIE) speed regulator; This speed regulator is four nozzle needle servomotors and a jet deflector servomotor; with the numerical control ball valve as electro-hydraulic converting element; speed regulator adopts nozzle needle aperture displacement transducer as electric feedback elements; the jet deflector displacement only has the aperture indication; without feedback elements; concern without joint with the nozzle needle aperture, therefore also do not participate in regulating, only play the accident protective action.The high bridge power station is with 110 a kV circuits access area power grid, area power grid with 220 kV circuit with economize net and link, the end that high bridge power station system incorporates province's electrical network into is incorporated into the power networks, under electrical network and power station normal operating condition, not yet find the problem .2004 mid-September of operation stability aspect, the 220 kV interconnections that the single site network of high bridge power station access and province's net link arrange interruption maintenance.After disconnecting the 220kV interconnection, the high bridge power station is in the island network running state as main force's power supply and the single site network that accesses.The high bridge power station is three unit synteny 80 MW load operations at that time, and the load of location net only has about 25 MW, 220 kV interconnections disconnect and to mean that the load in high bridge power station is down to suddenly 25 MW by 80 MW, be in load great fluctuation process state, grid cyclic wave rises to rapidly 59.7 Hz, three machine removal of loads are closed jet deflector to complete shut-down in 2 s, area power grid loses suddenly main force's power supply, cycle plunges to 47.8 Hz, three machines of high bridge are opened rapidly jet deflector simultaneously, and grid cyclic wave rises again rapidly; Cycle changes back and forth several times rapidly, and network load is complete resection (low-frequency load reduction) in succession, the area power grid collapse, and three machine rotating speeds of high bridge are down to the whole off-the-lines of 300 r/min, and station service disappears.Economize electrical network and have to close again 220 kV interconnections, recover regional mains supply, and then successively three machines in high bridge power station are connected to the grid, last 40 min, cause area power grid to the interruption of power supply of important load tens minutes, cause the mains supply discontinuity events;
2, because the no thoroughness of current is blocked in outer adjusting mechanism (jet deflector or shunt), in order to satisfy the requirement of rising rate of rolational speed of generating set, must be that nozzle needle is closed within a certain period of time.Impulse turbine is that high head generally all is long water channeling type power station, satisfied the requirement of closing of nozzle needle, often the diversion system pressure rise does not meet the demands again, again in order to satisfy the pressure rise requirement, diversion system all is provided with a larger surge shaft, and engineering investment cost is larger.
This patent is exactly fundamentally to solve noise, the vibration that the adjusting of impact type unit brings by a kind of flow control device (to regulate the termination that mechanism's (jet deflector or shunt) is installed in nozzle 2 outward, be subjected to nozzle 2 to stretch into the cantilever effect of runner envelope 4, produce very large vibration and noise to unit after outer adjusting mechanism (jet deflector or shunt) 1 devotes oneself to work) etc. practical problem; And the collision of the current that are folded to or shunt by runner envelope is difficult to reach by experiment the theoretical theoretical question of determining to the secondary action of runner.Realize the good dual regulation of impulse turbine, improve the stability of unit and Operation of Electric Systems.The setting of cancellation diversion system surge shaft or reduce the size of surge shaft, optimal design in Power Plant Design reduces diversion tunnel and penstock cross-section size; Reduce penstock external wrapping concrete, tunnel lining thickness and arrangement of reinforcement; Reduce the design thickness of penstock and Water distribution circular pipe; Reduce the rotary inertia of hydraulic generator unit.Reduce engineering investment cost.
Summary of the invention
The present invention provides a kind of impulse turbine inner core control flow meter and method.
The object of the present invention is achieved like this, a kind of impulse turbine inner core control flow meter and method, it is characterized in that: shown in Fig. 3,4, at the rotary wheel of water turbine 5 peripheral flow control devices 7 that a tubular is installed, and be connected with flow control device 7 urceolus 12 by strut 8, flow dontroller 7 is fixed on the factory building second stage concrete 9, is not connected with water turbine.Flow control device 7 is comprised of the concentric inside and outside bitubular, urceolus 12 maintains static, and inner core 11 can rotate, and sees Fig. 5,6,7,8,9,10 for details, critical piece inner core 11, outer logical 12 and be connected to lower railway 14, Flow-rate adjustment hole servomotor 15 on the urceolus 12, get on the right track 16.Working principle is: by adjusting the size of flow adjustment hole 10 on the flow control device 7, replace the regulatory function of the outer adjusting mechanism (jet deflector or shunt) in the present unit, solve the problem that impulse turbine exists.
Advantage of the present invention:
1, the outer adjusting mechanism (jet deflector or shunt) that has cancelled on the nozzle of impulse water turbine head is replaced by flow control device, flow control device is fixed on the factory building second stage concrete, has solved vibration and noise that outer adjusting mechanism (jet deflector or shunt) produces unit; Flow control device is around one week of runner, can thoroughly cut off injection stream to the positive effect of runner; Can realize impulse turbine dual regulation truly;
2, realize truly dual regulation, can improve the stability of Operation of Electric Systems;
3, flow control device is good to the runner flow control, when unit needs emergency shutdown, can effectively control rising rate of rolational speed of generating set and pressure rise.Therefore, in hydroelectric station design, can cancel the setting of diversion system surge shaft or effectively reduce the size of surge shaft, can reduce diversion tunnel and penstock cross-section size; Reduce penstock external wrapping concrete, tunnel lining thickness and arrangement of reinforcement; Reduce the design thickness of penstock and Water distribution circular pipe; Reduce the rotary inertia of hydraulic generator unit.Reduce engineering investment cost.
Description of drawings
The invention will be further described below in conjunction with embodiment's accompanying drawing:
Fig. 1: the A-A sectional drawing that is original structure schematic representation 2 of the present invention;
Fig. 2: the B-B sectional drawing that is original structure schematic representation 1 of the present invention;
Fig. 3: the C-C sectional drawing that is embodiment of the invention structural representation Fig. 4;
Fig. 4: the D-D sectional drawing that is embodiment of the invention structural representation Fig. 3;
Fig. 5: be flow control device 7 plan views of the present invention;
Fig. 6: be flow control device 7 plan views of the present invention;
Fig. 7: be flow control device 7 Fig. 6 E-E sectional drawings of the present invention;
Fig. 8: be flow control device 7 Fig. 6 F-F sectional drawings of the present invention;
Fig. 9: be A enlarged view among flow control device 7 Fig. 7 of the present invention;
Figure 10: be B enlarged view among flow control device 7 Fig. 7 of the present invention.
Reference character is as follows:
1. regulate outward mechanism's (jet deflector or shunt), 2. nozzle needle, 3. nozzle, 4. runner envelope, 5. runner, 6. water turbine, 7. flow control device, 8. strut, 9. second stage concrete, 10. Flow-rate adjustment hole, 11. inner cores, 12. urceolus, 13. inner core bottom rollers, 14. lower railway, 15. Flow-rate adjustment hole servomotors, 16. get on the right track, 17. inner core upper rollers.
Embodiment
Shown in Fig. 3,4, in rotary wheel of water turbine 5 peripheries the flow control devices 7 of a tubular are installed, and are connected with flow control device 7 urceolus 12 by strut 8, flow dontroller 7 is fixed on the factory building second stage concrete 9.Flow control device 7 is comprised of the concentric inside and outside bitubular, urceolus 12 maintains static, inner core 11 can rotate, see Fig. 5,6,7,8,9,10 for details, critical piece inner core 11, outer logical 12 and be connected to lower railway 14, Flow-rate adjustment hole servomotor 15 on the urceolus 12, get on the right track 16, characteristics: flow control device 7 is regulated and control simultaneously to each nozzle, only operate interior bucket 11 during regulation and control and rotate, simple in structure.Load reduces suddenly when the power station, generating unit speed raises, the seepage tunnel, high-head power station, the long restriction because surge pressure raises of steel pipe length, unit nozzle needle 2 can not turn down rapidly, at this moment the inner core 11 that drives rapidly on the flow control device 7 by the Flow-rate adjustment hole servomotor 15 that is connected on the lower railway 14 rotates, (the Flow-rate adjustment hole is on the jet axis of each nozzle to make Flow-rate adjustment hole 10, size is with the maximum value of jet diameter or larger than maximum value, determine according to design) reduce the cutout portion current and enter runner 5, with the control rising rate of rolational speed of generating set, then the requirement of nozzle needle 2 according to pressure rise slowly turned down, generating unit speed drops to certain value, reverse operating Flow-rate adjustment hole servomotor 15 rotates inner core 11 turn-on flow rate adjustment holes 10 again, nozzle needle 2 stops to turn down, generating unit speed raises again, again operate flow adjustment hole servomotor 15 rotation inner cores 11 and reduce Flow-rate adjustment hole 10, nozzle needle 2 slowly turns down according to the requirement of pressure rise again, through reciprocal several times, nozzle needle 2 apertures are adjusted to the desired aperture of unit load, generating unit speed is stabilized in desired rotating speed, operates subsequently flow adjustment hole servomotor 15 rotation inner cores 11 again Flow-rate adjustment hole 10 is returned to initial conditions (maximum); When the power station load rejection needs emergency shutdown, operation flow adjustment hole servomotor 15 rotates inner core 11 with Flow-rate adjustment hole 10 contract fullys rapidly, cut off current and enter runner 5, the control rising rate of rolational speed of generating set is shut down, close slowly subsequently nozzle needle 2 pilot pressures and rise, until nozzle needle 2 close fully unit come to a complete stop after again reverse operating Flow-rate adjustment hole servomotor 15 rotate inner cores 11 Flow-rate adjustment hole 10 returned to initial conditions (maximum); Load increases when the power station, increases with identical nozzle needle 2 apertures of conventional adjusting.
Above-mentioned being described in detail adopts a servomotor 15 to implement the process of Flow-rate adjustment to flow control device 7, if also can adopt two servomotors 15 to be arranged symmetrically with operation inner core 11 for large-scale unit, implementation process is the same.
In order to make servomotor 15 operations in Flow-rate adjustment hole quick fast, open a little holes at inner core 11, to reduce cylindrical shell quality (coherence).
Claims (4)
1. an impulse turbine inner core is controlled flow meter and method, it is characterized in that: such as Fig. 3,4 at the rotary wheel of water turbine 5 peripheral flow control devices 7 that a tubular is installed, and be connected with flow control device 7 urceolus 12 by strut 8, flow dontroller 7 is fixed on the factory building second stage concrete 9, be not connected with water turbine, by adjusting the size of flow adjustment hole 10 on the flow control device 7, replace the regulatory function of the outer adjusting mechanism (jet deflector or shunt) in the present unit, solved vibration and noise that outer adjusting mechanism (jet deflector or shunt) produces unit; Flow control device is around one week of runner, can thoroughly cut off injection stream to the positive effect of runner; Can realize impulse turbine dual regulation truly.
2. a kind of impulse turbine inner core according to claim 1 is controlled flow meter and method, it is characterized in that: flow control device 7 is by in concentric, the outer bitubular forms, urceolus 12 maintains static, inner core 11 can rotate, see Fig. 5 for details, 6,7,8,9,10, critical piece inner core 11, outer logical 12 and be connected to lower railway 14 on the urceolus 12, Flow-rate adjustment hole servomotor 15, get on the right track 16, characteristics: flow control device 7 is regulated and control simultaneously to each nozzle, only operating interior bucket 11 during regulation and control rotates, simple in structure. load reduces suddenly when the power station, generating unit speed raises, the seepage tunnel, high-head power station, the long restriction because surge pressure raises of steel pipe length, unit nozzle needle 2 can not turn down rapidly, at this moment the inner core 11 that drives rapidly on the flow control device 7 by the Flow-rate adjustment hole servomotor 15 that is connected on the lower railway 14 rotates, (the Flow-rate adjustment hole is on the jet axis of each nozzle to make Flow-rate adjustment hole 10, size is with the maximum value of jet diameter or larger than maximum value, determine according to design) reduce the cutout portion current and enter runner 5, with the control rising rate of rolational speed of generating set, then the requirement of nozzle needle 2 according to pressure rise slowly turned down, generating unit speed drops to certain value, reverse operating Flow-rate adjustment hole servomotor 15 rotates inner core 11 turn-on flow rate adjustment holes 10 again, nozzle needle 2 stops to turn down, generating unit speed raises again, again operate flow adjustment hole servomotor 15 rotation inner cores 11 and reduce Flow-rate adjustment hole 10, nozzle needle 2 slowly turns down according to the requirement of pressure rise again, through reciprocal several times, nozzle needle 2 apertures are adjusted to the desired aperture of unit load, generating unit speed is stabilized in desired rotating speed, operates subsequently flow adjustment hole servomotor 15 rotation inner cores 11 again Flow-rate adjustment hole 10 is returned to initial conditions (maximum); When the power station load rejection needs emergency shutdown, operation flow adjustment hole servomotor 15 rotates inner core 11 with Flow-rate adjustment hole 10 contract fullys rapidly, cut off current and enter runner 5, the control rising rate of rolational speed of generating set is shut down, close slowly subsequently nozzle needle 2 pilot pressures and rise, until nozzle needle 2 close fully unit come to a complete stop after again reverse operating Flow-rate adjustment hole servomotor 15 rotate inner cores 11 Flow-rate adjustment hole 10 returned to initial conditions (maximum); Load increases when the power station, increases with identical nozzle needle 2 apertures of conventional adjusting.
3. a kind of impulse turbine inner core according to claim 1 is controlled flow meter and method, and it is characterized in that: flow control device 7 also can adopt two Flow-rate adjustment hole servomotors 15 to be arranged symmetrically with for large-scale unit, operation inner core 11.
4. a kind of impulse turbine inner core according to claim 1 is controlled flow meter and method, it is characterized in that: 7 pairs of runner flow controls of flow control device are good, when unit needs emergency shutdown, can effectively control rising rate of rolational speed of generating set and pressure rise. therefore, in hydroelectric station design, can cancel the setting of diversion system surge shaft or effectively reduce the size of surge shaft, can reduce diversion tunnel and penstock cross-section size; Reduce penstock external wrapping concrete, tunnel lining thickness and arrangement of reinforcement; Reduce the design thickness of penstock and Water distribution circular pipe; Reduce the rotary inertia of hydraulic generator unit; Reduce engineering investment cost.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2013100247620A CN103047077A (en) | 2013-01-24 | 2013-01-24 | Device and method for inner tube flow control of impulse turbine |
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| CN2013100247620A CN103047077A (en) | 2013-01-24 | 2013-01-24 | Device and method for inner tube flow control of impulse turbine |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014203272A2 (en) * | 2013-06-19 | 2014-12-24 | Kumar Bharath Sai | A multi nozzle device for precise pressure control of gases and fluids |
| CN104895736A (en) * | 2014-12-31 | 2015-09-09 | 武汉四创自动控制技术有限责任公司 | Intelligent control system of impulse water turbines |
| CN104930295A (en) * | 2015-06-03 | 2015-09-23 | 国家电网公司 | Method for eliminating water diversion system self-induced vibration of pumped storage power station |
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| GB191113961A (en) * | 1911-06-12 | 1911-11-02 | John Kincaid | Water Wheel Gate Rings. |
| US2976687A (en) * | 1956-07-16 | 1961-03-28 | Allis Chalmers Mfg Co | Control for multijet impulse turbine |
| EP1308619A1 (en) * | 2001-10-31 | 2003-05-07 | Turbinenbau Troyer GmbH / S.r.l. | Multiple injectors Pelton turbine |
| CN201025219Y (en) * | 2007-05-11 | 2008-02-20 | 四川东风电机厂有限公司 | Hydraulic pressure controlled multi-spraying mouth device for impact water wheel machine |
| US7503744B1 (en) * | 2005-10-06 | 2009-03-17 | Broome Kenneth R | Undershot impulse jet driven waterwheel having an automatically adjustable radial gate for optimal hydroelectric power generation and water level control |
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2013
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB191113961A (en) * | 1911-06-12 | 1911-11-02 | John Kincaid | Water Wheel Gate Rings. |
| US2976687A (en) * | 1956-07-16 | 1961-03-28 | Allis Chalmers Mfg Co | Control for multijet impulse turbine |
| EP1308619A1 (en) * | 2001-10-31 | 2003-05-07 | Turbinenbau Troyer GmbH / S.r.l. | Multiple injectors Pelton turbine |
| US7503744B1 (en) * | 2005-10-06 | 2009-03-17 | Broome Kenneth R | Undershot impulse jet driven waterwheel having an automatically adjustable radial gate for optimal hydroelectric power generation and water level control |
| CN201025219Y (en) * | 2007-05-11 | 2008-02-20 | 四川东风电机厂有限公司 | Hydraulic pressure controlled multi-spraying mouth device for impact water wheel machine |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014203272A2 (en) * | 2013-06-19 | 2014-12-24 | Kumar Bharath Sai | A multi nozzle device for precise pressure control of gases and fluids |
| WO2014203272A3 (en) * | 2013-06-19 | 2015-02-12 | Kumar Bharath Sai | A multi nozzle device for precise pressure control of gases and fluids |
| CN104895736A (en) * | 2014-12-31 | 2015-09-09 | 武汉四创自动控制技术有限责任公司 | Intelligent control system of impulse water turbines |
| CN104895736B (en) * | 2014-12-31 | 2017-03-08 | 武汉四创自动控制技术有限责任公司 | Impulse turbine intelligence control system |
| CN104930295A (en) * | 2015-06-03 | 2015-09-23 | 国家电网公司 | Method for eliminating water diversion system self-induced vibration of pumped storage power station |
| CN104930295B (en) * | 2015-06-03 | 2017-01-25 | 国家电网公司 | Method for eliminating water diversion system self-induced vibration of pumped storage power station |
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Application publication date: 20130417 |