GB1565603A – Method of and system for operating pump turbine
– Google Patents
GB1565603A – Method of and system for operating pump turbine
– Google Patents
Method of and system for operating pump turbine
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Publication number
GB1565603A
GB1565603A
GB3871/78A
GB387178A
GB1565603A
GB 1565603 A
GB1565603 A
GB 1565603A
GB 3871/78 A
GB3871/78 A
GB 3871/78A
GB 387178 A
GB387178 A
GB 387178A
GB 1565603 A
GB1565603 A
GB 1565603A
Authority
GB
United Kingdom
Prior art keywords
runner
pump turbine
pump
runner chamber
water
Prior art date
1977-01-31
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3871/78A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toshiba Corp
Original Assignee
Tokyo Shibaura Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1977-01-31
Filing date
1978-01-31
Publication date
1980-04-23
1978-01-31
Application filed by Tokyo Shibaura Electric Co Ltd
filed
Critical
Tokyo Shibaura Electric Co Ltd
1980-04-23
Publication of GB1565603A
publication
Critical
patent/GB1565603A/en
Status
Expired
legal-status
Critical
Current
Links
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Discuss
Classifications
F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
F03B—MACHINES OR ENGINES FOR LIQUIDS
F03B15/00—Controlling
F03B15/005—Starting, also of pump-turbines
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
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
Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
Y10S415/00—Rotary kinetic fluid motors or pumps
Y10S415/91—Reversible between pump and motor use
Description
PATENT SPECIFICATION
( 21) Application No 3871/78 ( 22) Filed 31 Jan 1978 ( 31) Convention Application No 52/009 349 ( 32) Filed 31 Jan 1977 in ( 33) Japan (JP) ( 44) Complete Specification published 23 April 1980 ( 51) INT CL 3 F 04 D 9/00 ( 52) Index at acceptance F 1 C 25 ( 72) Inventors YOZO KAWASE and MAKOTO FUJISAKI ( 11) 1565603 ( 19) ( 54) METHOD OF AND SYSTEM FOR OPERATING PUMP TURBINE ( 71) We, TOKYO SHIBAURA DEN Ki KAB Us HI Ui KAISHA, a Japanese Company, of 72, Horikawa-cho, Saiwai-Ku, KawasakiShi, Kanagawa-Ken, Japan, do hereby dedare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the
following statement: –
This invention relates to an improved method of and system for operating a pump turbine, and more particularly, a method in which corrosion of elements of the pump turbine system caused by oxygen dissolved in water is effectively prevented.
It is known that in a pump turbine, compressed air is supplied into a runner chamber at the pumping-up starting time and the water level in the runner chamber is forced downwardly of the runner so as to start the turbine in air After the starting, when the rotating speed of the runner increases and reaches a rated speed, an exhaust valve is opened thereby exhausting the compressed air in the runner chamber Simultaneously, the water level in the runner chamber goes upward and the runner chamber is filled with water and after detecting the priming pressure in the runner chamber, the exhaust valve is closed.
Although it is of course necessary that the compressed air in the runner chamber should be completely exhausted at the time of completely closing the exhaust valve, actually, it is impossible to completely exhaust the air in the runner chamber because of the whirling flow caused by water or the shapes of the runner and the covers, and particularly, in a high-speed machine operating under a high head, the runner and the flow passage are constructed to be flat so that in an extreme case, it becomes impossible to exhaust the compressed air and therefore to start the pumping-up operation of the turbine In such case, a large quantity of the oxygen in the air remaining in the runner chamber will be dissolved in water by the whirling flow caused by the rotation of the runner whereby the amount of the dissolved oxygen increases.
In a normal operation of a pump turbine, after the starting of the pump, guide vanes are opened to start pumping-up operation, so that water containing a large quantity of oxygen is discharged into a reservoir located above the pump turbine system through a penstock Therefore, there is no trouble of damaging the elements of the turbine system by, for example, corrosion caused by the dissolved oxygen.
However, the pump turbine is not always transferred to the pumping-up operation immediately after the disconnection of the generator from the power transmission system In such case, the pump turbine is maintained in the inoperative state for a indefinite interval during which the surfaces of the runner, the upper and lower covers, the guide vanes, etc may be corroded by the dissolved oxygen, which leads to the lowering of the running efficiency of the pump-water turbine.
In this connection, Figure 1 shows a relationship between the concentration of oxygen dissolved in water and corrosion speed of the elements As shown in Figure 1, the corrosion speed increases linearly till the amount of the dissolved oxygen reaches nearly 1 % by volume of water, but above nearly 1 %, the corrosion speed decreases rapidly, but local corrosion begins to occur.
Accordingly, it is an object of this invention to provide an improved method of and apparatus for operating a pump turbine system for preventing corrosion of the surfaces of the elements of the system caused by the oxygen dissolved in water.
According to the invention of this application, in one aspect, there is provided a method of operating a pump turbine, wherein the method comprises the steps of supplying compressed air into a runner chamber of the turbine and opening a leakage drain valve of a pipe for drawing water leaking through the guide vanes of the pump turbine at the time of m 1 fz 1,565,603 starting the pump turbine to force downwardly the level of the water in the runner chamber and to rotate a runner of the pump turbine in air, exhausting the compressed air in the runner chamber when the rotating speed of the runner reaches a rated speed for pump operation, thus filling the runner chamber with water, draining water containing a large quantity of dissolved oxygen and contained near the periphery of the runner into a spillway through said pipe detecting priming pressure in the runner chamber, and closing the leakage drain valve after a predetermined time from the detection of the priming pressure.
In another aspect of the invention, there is provided a system for operating a pump turbine which pump turbine is provided with guide vanes and a draft tube, the system comprising valve means for supplying compressed air into a runner chamber of the pump turbine, at the time of starting the pump turbine as a pump, so as to force downwardly the level of the water in the runner chamber to rotate the runner in air, valve means for exhausting the compressed air in the runner chamber when the rotating speed of the runner reaches a rated speed for pump operation thus filling the runner chamber with water, a drain pipe for draining water containing a large quantity of dissolved oxygen and contained near the periphery of the runner into the draft tube, pressure detecting means for detecting priming pressure in the runner chamber, and a timer connected to the output of the detecting means for closing a valve in the drain pipe after a predetermined time from the detection of the priming pressure.
In the accompanying drawings:
Figure 1 is a graph showing the relationship between the concentration, in volume %, of the oxygen dissolved in water and the corrosion speed (mg/dm 2/day); Figure 2 is a diagrammatic cross-sectional view of a system to which the method of this invention is applied; and Figure 3 is a flow chart showing the steps of the method of this invention.
The method of operating a pump turbine according to an embodiment of the present invention will be described hereinbelow with reference to Figures 2 to 4.
Figure 2 shows one example of a Francis type pump turbine, in which a runner 2 is attached to the lower end of a shaft 1 The runner 2 is rotatable in a runner chamber 3 which is surrounded by upper and lower covers 4 and 5 Guide vanes 6, stay vanes 7 and a spiral casing 8 are arranged radially outwardly of the runner chamber 3 in a known manner and a draft tube 9 is also provided below the runner chamber 3 To the upper cover 4 is attached a supply and exhaust pipe 10, one end of which is opened on the back side of the runner 2 and the other end is connected to a source 11 of compressed air and an exhaust pipe 20.
Valves 12 and 19 for controlling the supply or discharge of the compressed air are pro 70 vided at intermediate points of the pipe 10.
The lower cover 5 is connected to the draft tube 9 through a leakage drain pipe 13 contains a leakage drain valve 14 The upper and lower covers 4 and 5 are con 75 nected with each other through outer and inner balance pipes 15 and 16 so as to remove pressure difference therebetween.
The operation of the pump turbine to which the method according to this inven 80 tion is applied will be described hereunder in conjunction with Figure 3.
First, when a pumping-up instruction is given to the pump turbine, the guide vanes 6 are fully closed, and the leakage drain 85 valve 14 is opened together with the supply valve 12 Then, the compressed air is supplied from the compressed air source 11 to the runner chamber 3 through the pipe 10 thereby forcing downwardly the water in 90 the chamber 3 into the draft tube 9 The valve 12 is completely closed when the level of the water reaches a predetermined level below the runner 2.
Usually, a starting generator motor (not 95 shown) is mounted on the shaft 1 The starting generator motor is now operated as a motor to start the pump in air As the runner speeds up to the rated speed, the generator motor is connected to the power sys 100 tem, and the starting operation is continued.
During this step, the water leaked out from the guide vanes 6 to the runner chamber 3 is drained into the draft tube 9 through the leakage drain pipe 13 105 On the next stage, when the exhaust valve 19 is opened to exhaust the compressed air in the runner chamber 3 into atmosphere through pipes 10 and 20, the water level below the runner 2 gradually goes upward 110 by the atmospheric pressure to fill the runner chamber with water When pressure in the chamber 3 increases to a predetermined priming pressure, a time delay relay 18 ineluding a timer is energized and the leakage 115 drain valve 14 is closed after the lapse of a time preset by the timer It is advantageous to preset this time so that water containing a large quantity of oxygen and collecting near the periphery of the runner 2 120 will be completely forced out through the leakage drain pipe 13 into the draft tube 9.
Since one end of the pipe 13 opening through the lower cover 5 is upsually posi 125 tioned at a portion near the outer periphery of the runner, the pressure applied on the opened end is considerably high and there is a large pressure difference between this opening and the upper end of the draft tube 130 1,565,603 9 connected to the runner chamber 3, so that a large amount of water can be drained.
Thus, since the time for closing the leakage drain valve 14 is preset a predetermined time later than the time of detection of the priming pressure under the running condition of the pump turbine, water containing a large quantity of oxygen and contained in the runner chamber can be forced out into the spillway through the draft tube, thereby effectively preventing the corrosion of the surfaces of the runner, the upper and lower covers, the guide vanes etc Furthermore, the life of the elements constituting the pump turbine system can be increased and the lowering of the operating efficiency of the runner caused by the corrosion can be efficiently prevented.
Although in Figure 2, the outlet end of the leakage drain pipe 13 is connected to the draft tube 9, it may be connected to the spillway.
Claims (4)
WHAT WE CLAIM IS: –
1 A method of operating a pump turbine, wherein said method comprises the steps of supplying compressed air into a runner chamber of said pump turbine and opening a leakage drain valve of a pipe for drawing water leaking through the guide vanes of the pump turbine at the time of starting the pump turbine to force downwardly the level of the water in said runner chamber and to rotate a runner of the pump turbine in air, exhausting the compressed air in the runner chamber when the rotating speed of the runner reaches a rated speed for pump operation, thus filling said runner chamber with water, draining water containing a large quantity of dissolved oxygen and contained near the periphery of said runner into a spillway through the said pipe detecting priming pressure in said runner chamber, and closing the leakage drain valve after a predetermined time from the detection of the priming pressure.
2 A system for operating a pump turbine according to the method of claim 1, which pump turbine is provided with a draft tube, the system comprising valve means for supplying compressed air into a runner chamber of said pump turbine at the time of starting the pump turbine as a pump so as to force downwardly the level of the water in said runner chamber in air, valve means for exhausting the compressed air in said runner chamber when the rotating speed of said runner reaches a rated speed for pump operation thus filling said runner chamber with water, a drain pipe for draining water containing a large quantity of dissolved oxygen and contained near the periphery of said runner into the draft tube, pressure detecting means for detecting priming pressure in said runner chamber, and a timer connected to the output of said detecting means for closing a valve in the drain pipe after a predetermined time from the detection of the priming pressure.
3 A method of operating a pump substantially as herein described with reference to the accompanying drawings.
4 A system for operating a pump substantially as herein described with reference to and as illustrated in the accompanying drawings.
ARTHUR R DAVIES, Chartered Patent Agents, 27, Imperial Square, Cheltenham, and 115, High Holborn, London, W C 1.
Agents for the Applicants.
Printed for Her Majesty’s Stationery Office by Burgess & Son (Abingdon), Ltd -1980.
Published at The Patent Office, 25 Southampton Buildings, London, WC 2 A l AY, from which copies may be obtained.
GB3871/78A
1977-01-31
1978-01-31
Method of and system for operating pump turbine
Expired
GB1565603A
(en)
Applications Claiming Priority (1)
Application Number
Priority Date
Filing Date
Title
JP934977A
JPS5395447A
(en)
1977-01-31
1977-01-31
Operation of reversible pump-turbine
Publications (1)
Publication Number
Publication Date
GB1565603A
true
GB1565603A
(en)
1980-04-23
Family
ID=11717984
Family Applications (1)
Application Number
Title
Priority Date
Filing Date
GB3871/78A
Expired
GB1565603A
(en)
1977-01-31
1978-01-31
Method of and system for operating pump turbine
Country Status (5)
Country
Link
US
(1)
US4158525A
(en)
JP
(1)
JPS5395447A
(en)
CH
(1)
CH620017A5
(en)
DE
(1)
DE2803367C3
(en)
GB
(1)
GB1565603A
(en)
Cited By (2)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3203354A1
(en)
*
1981-02-03
1982-08-12
Tokyo Shibaura Denki K.K., Kawasaki, Kanagawa
MULTI-STAGE HYDROPOWER AND TAX PROCEDURE THEREFOR
DE3203442A1
(en)
*
1981-02-03
1982-10-21
Tokyo Shibaura Denki K.K., Kawasaki, Kanagawa
CONTROL METHOD FOR A MULTI-STAGE HYDROPOWER
Families Citing this family (17)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
JPS6042357B2
(en)
*
1978-07-21
1985-09-21
株式会社日立製作所
How to operate a water turbine or pump turbine
JPS5548233A
(en)
*
1978-09-29
1980-04-05
D J- K Internatl Kk
Hot melt polymer composition with elasticity
FR2439316A1
(en)
*
1978-10-20
1980-05-16
Neyrpic
IMPROVEMENT AT STARTING OF PUMPS OR TURBINE PUMPS
US4406577A
(en)
*
1979-10-29
1983-09-27
Tokyo Shibaura Denki Kabushiki Kaisha
Multi-stage hydraulic machine and a method of operating same
US4492514A
(en)
*
1980-08-18
1985-01-08
Stang Hydronics Inc.
Submerged pump assembly and method of making and using same
JPS5781164A
(en)
*
1980-11-07
1982-05-21
Toshiba Corp
Exhaust equipment for multi-stage hydraulic machine
JPS5847171A
(en)
*
1981-09-14
1983-03-18
Toshiba Corp
Multi-stage hydraulic machinery
JPS58148278A
(en)
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1982-02-26
1983-09-03
Toshiba Corp
Method and device for drainage of guide vane leakage in a reversible hydraulic machine
JPS58148277A
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1982-02-26
1983-09-03
Hitachi Ltd
Rotary hydraulic machinery carrying exhaust valve
JPS60156727U
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1984-03-27
1985-10-18
ミツミ電機株式会社
Bobbin for transformer
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1996-09-30
1998-04-21
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Air supply device of hydraulic machinery
US5941682A
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1997-07-24
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Voith Hydro, Inc.
Draft tube peripheral plenum
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Sears; Samuel D.
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国家电网公司
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Dominion Eng Works Ltd
Francis turbines and centrifugal pumps
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English Electric Co Ltd
Improvements in or relating to hydraulic pumps and reversible pump turbines
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Seal for rotary hydraulic machine
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Starting means for an hydraulic pump
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1977-01-31
JP
JP934977A
patent/JPS5395447A/en
active
Granted
1978
1978-01-24
US
US05/872,007
patent/US4158525A/en
not_active
Expired – Lifetime
1978-01-26
DE
DE2803367A
patent/DE2803367C3/en
not_active
Expired
1978-01-30
CH
CH98678A
patent/CH620017A5/fr
not_active
IP Right Cessation
1978-01-31
GB
GB3871/78A
patent/GB1565603A/en
not_active
Expired
Cited By (3)
* Cited by examiner, † Cited by third party
Publication number
Priority date
Publication date
Assignee
Title
DE3203354A1
(en)
*
1981-02-03
1982-08-12
Tokyo Shibaura Denki K.K., Kawasaki, Kanagawa
MULTI-STAGE HYDROPOWER AND TAX PROCEDURE THEREFOR
DE3203442A1
(en)
*
1981-02-03
1982-10-21
Tokyo Shibaura Denki K.K., Kawasaki, Kanagawa
CONTROL METHOD FOR A MULTI-STAGE HYDROPOWER
US4537558A
(en)
*
1981-02-03
1985-08-27
Tokyo Shibaura Denki Kabushiki Kaisha
Multi-stage hydraulic machine and control method for a multi-stage hydraulic machine
Also Published As
Publication number
Publication date
US4158525A
(en)
1979-06-19
CH620017A5
(en)
1980-10-31
DE2803367B2
(en)
1981-06-25
DE2803367A1
(en)
1978-08-10
JPS5624102B2
(en)
1981-06-04
DE2803367C3
(en)
1982-02-25
JPS5395447A
(en)
1978-08-21
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Legal Events
Date
Code
Title
Description
1980-07-09
PS
Patent sealed [section 19, patents act 1949]
1986-11-19
746
Register noted ‘licences of right’ (sect. 46/1977)
1988-09-28
PCNP
Patent ceased through non-payment of renewal fee
