GB2417759A - Combined tidal and river power generation system - Google Patents

Combined tidal and river power generation system Download PDF

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Publication number
GB2417759A
GB2417759A GB0514274A GB0514274A GB2417759A GB 2417759 A GB2417759 A GB 2417759A GB 0514274 A GB0514274 A GB 0514274A GB 0514274 A GB0514274 A GB 0514274A GB 2417759 A GB2417759 A GB 2417759A
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GB
United Kingdom
Prior art keywords
gates
water
tidal power
basins
flooding
Prior art date
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.)
Granted
Application number
GB0514274A
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GB2417759B (en
GB0514274D0 (en
Inventor
Jwo-Hwu Yi
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KUN SHAN UNIVERSITY
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KUN SHAN, University of
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Publication of GB0514274D0 publication Critical patent/GB0514274D0/en
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B9/00—Water-power plants; Layout, construction or equipment, methods of, or apparatus for, making same
    • E02B9/08—Tide or wave power plants
    • 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
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/26—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy
    • F03B13/268—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide energy making use of a dam
    • 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
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/26—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using tide 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
    • 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
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Oceanography (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

The tidal basins 97, surrounded by embankments 81 or hollowed out of cliffs, have sluice gates 82 and hydraulic turbine and generator sets 83. River water can be diverted by diversion gates 90 located at a high elevation in a river 89 and carried by pipes 91 to flooding gates 92 located at a lower elevation at the water intake of the tidal basins 97. Water diverted from the river 89 flows into the tidal basins 97 increasing the water level in the basins so that power may be generated even during the ebb tide periods.

Description

TIDAL POWER GENERATION METHOD WITH THE WATER FROM RIVERS
BACKGROUND OF THE INVENTION
Field of Invention
The present invention relates to tidal power generation methods and more particularly to a tidal power generation method by utilizing fresh water stored in the tidal power basins built at coast in which fresh water is diverted from rivers to the tidal power basins in the flood tide period for storage and the stored water is then utilized to generate electricity in the ebb tide period.
Related Art A conventional tidal power generation is carried out by building dams between the sea and the tidal power basins, allowing the sea water to be stored in the tidal power basins, and letting the stored sea water flow out from the tidal power basins to rotate hydraulic turbine and generator sets and to generate electricity in the flood tide period or the ebb tide period. Electricity generated by a conventional tidal power plant in the flood tide period or the ebb tide period is &t Thus, the total generated electricity is 4 = &t where FIG iS the efficiency of hydraulic turbine and generator sets, R is the density of liquid (tons/m3), A is the area of the tidal power basins (m2), and Ht is the tide range which is less than 20m in the world. Thus, electricity generated by a conventional tidal power plant is limited.
As to collecting fresh water for waterworks, one method is to build dams in the headwaters or midstream of rivers. However, a number of drawbacks (e.g., ecological damage, environmental damage, etc.) have been found with respect to build dams in the headwaters or midstream of rivers. Another method is to build pumping stations and waterworks at the riversides. However, the water storage capacity of pumping stations is very limited. For collecting fresh water for waterworks, it is important to collect as much rain-water as possible before it flows from rivers to the sea. Thus, a need for improvement exists in order to overcome the inadequacies of the prior art and to contribute significantly to the advancement of the art.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide, in a system having the tidal power basins at the seacoast, the sluice gates of the tidal power basins, hydraulic turbine and generator sets, the diversion gates in the high elevation positions of rivers, the flooding gates at water intakes of the tidal power basins, and the guiding pipes interconnecting the diversion gates and the flooding gates, the method of generating hydroelectric power comprising (a) closing the sluice gates for storing water and opening the diversion gates and the flooding gates to divert water from the rivers to the tidal power basins through the guiding pipes; (b) opening the sluice gates to let water flow out from the tidal power basins to rotate the hydraulic turbine and generator sets for generating electricity prior to flowing into the sea; (c) closely watching water intake and consumption for continuing the power generation; and (d) Loops back to step 1 for storing water when the power generation stops. By utilizing the method, advantages can be obtained including no protest against the building of the tidal power basins since it is located at the seacoast, much rain is collected since the diversion gates are built in the midstream or down stream of the rivers, the water storage capacity can be increased greatly because the enormous area of the tidal power basins, without interfering with the rivers ecology because the flow of rivers are not to stop by dams, no carbon dioxide emission, totally complying with the Kyoto protocol, and fresh water supply being possible.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 schematically depicts in the cross-sectional view a preferred embodiment of a tidal power generation system according to the invention; and FIG. 2 schematically depicts in a bird's eye view of the preferred embodiment shown in FIG. 1
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIGS. 1 and 2, a tidal power generation system in accordance with a preferred embodiment of the invention is illustrated. A reservoir 99 is built in a headwater of a river 89 flowing from the mountains. The river 89 flows into the sea at the estuary 93. The diversion gates 90 are built in the high elevation positions of the river 89 for diverting water from the river 89 (i.e., fresh water) to a flooding gates 92 at a water intake of the tidal power basins 97 through guiding pipes 91. It is noted that the elevation of the flooding gates 92 must be lower than that of the diversion gates 90 such that water can flow from the diversion gates 90 to the flooding gates 92. Note that spillways (not shown) are built at the tidal power basins 97 for safety reason.
The tidal power basins 97 are surrounded by embankments 81 at the seacoast. Preferably, we can hollow out the tidal power basins 97 in the cliffs in order to save construction cost and time. Elevation difference between the diversion gates 90 and the average level of the sea 98 can be as high as several ten meters or even several hundred meters if the system is built in a right place. Thus, electricity generated by the system can be greatly larger than that generated by a conventional tidal power plant because of the drop height is creased by a wide margin.
Moreover, electricity generated by the system is even larger when electricity is generated in the ebb tide period because the low water level 86 is lower than the average level of the sea 98 and thus the drop height is larger.
Electricity generated by the system can be increased by providing further hydraulic turbine and generator sets 83 at the flooding gates 92 if the elevation difference between the flooding gates 92 and the diversion gates 90 is large enough. Water in the tidal power basins 97 can be kept as fresh water if the water level in the tidal power basins 88 is always higher than the sea level.
Thus, the tidal power basins 97 can also serve as reservoirs. In detail, water pumps 84 and the pumping check gates 94 are built at the bank of the tidal power basins 97 to pump water to a waterworks 96 through pumping pipes 95.
Fresh water is then supplied for people consumption, industry, and/or agriculture purposes.
In an exemplary example, amount of water diverted from the river 89 to the tidal power basins 97 is about 10% of the total flow rate of the river 89. Thus, little adverse effect occurs with respect to rivers ecology. Water directed to rivers is about 60% of rainfall in Taiwan. Thus, water diverted to the tidal power basins 97 is about 6% of rainfall in Taiwan. In Taiwan, about 15% of rainfall was utilized for generating fresh water. Then the fresh water supply In Taiwan will increase from about 15% to about 21% of rainfall by utilizing the method of the invention. Thus, the fresh water shortage problem can be successfully solved.
Power can be generated by the system in three modes as detailed in embodiments below.
EMBODIMENT l: Power generation only in the ebb tide period Step 1: Close the sluice gates 82 of the tidal power basins. Open the diversion gates 90 and the flooding gates 92 to divert water from the river 89 to the tidal power basins 97.
Step 2: Open the sluice gates 82 of the tidal power basins in the ebb tide period to let water flow out from the tidal power basins 97 to rotate the hydraulic turbine and generator sets 83 prior to flowing into the sea.
Step 3: Closely watch water intake and consumption for continuing the power generation.
Step 4: Loops back to step 1 for storing water when the power generation stops.
This embodiment can maximize power generation in the ebb tide period because of the drop height is maximize. However, inevitably much stored water is consumed (i.e., little available for fresh water supply). Thus, the embodiment is particularly suitable for areas where there is a large tide range and with a sufficiency of fresh water.
EMBODIMENT Il: Power generation all day long Step 1: Close the sluice gates 82 of the tidal power basins. Open the diversion gates 90 and the flooding gates 92 to divert water from the river 89 to the tidal power basins 97.
Step 2: Open the sluice gates 82 of the tidal power basins when the water level in the tidal power basins 88 is about equal to the predetermined value in order to let water flow out from the tidal power basins 97 to rotate the hydraulic turbine and generator sets 83 prior to flowing into the sea.
Step 3: Closely watch water intake and consumption for continuing the power generation.
Step 4: Loops back to step 1 for storing water when the power generation stops.
This embodiment is carried out when water intake is about equal to water consumption. Whole day power generation and fresh water storage is possible.
Thus, the embodiment is particularly suitable for areas where there is a small tide range and with a deficiency of fresh water.
EMBODIMENT lil: Power generation only in the peak-period of electricity consumption Step 1: Close the sluice gates 82 of the tidal power basins. Open the diversion gates 90 and the flooding gates 92 to divert water from the river 89 to the tidal power basins 97.
Step 2: Open the sluice gates 82 of the tidal power basins in the peakperiod of electricity consumption to let water flow out from the tidal power basins 97 to rotate the hydraulic turbine and generator sets 83 prior to flowing into the sea.
Step 3: Closely watch water intake and consumption for continuing the power generation.
Step 4: Loops back to step 1 for storing water when the power generation stops.
Electricity rate is expensively in the peak-period of electricity consumption.
Thus, this embodiment can increase revenue by generating power in the peak-period of electricity consumption. However, inevitably much stored water is consumed (i.e., little available for fresh water supply). Thus, the embodiment is particularly suitable for areas where there is a deficiency of electricity in the peak-period of electricity consumption and with a sufficiency of fresh water.
While the invention herein disclosed has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of the invention set forth in the claims.

Claims (12)

  1. WHAT IS CLAIMED IS: 1. A tidal power generation method with water from
    rivers comprising a system having the tidal power basins at the seacoast, the sluice gates at the tidal power basins, the hydraulic turbine and generator sets, characterized in that the diversion gates are provided in the high elevation positions of rivers, the flooding gates are provided at water intakes of the tidal power basins, and the guiding pipes interconnect the diversion gates and the flooding gates for supplying water for power generation.
  2. 2. A method of claim 1 comprising the steps of: (a) closing the sluice gates for storing water and opening the diversion gates and the flooding gates to divert water from the rivers to the tidal power basins through the guiding pipes; (b) opening the sluice gates to let water flow out from the tidal power basins to rotate the hydraulic turbine and generator sets for generating electricity prior to flowing into the sea; (c) closely watching water intake and consumption for continuing the power generation; and (d) Loops back to step 1 for storing water when the power generation stops.
  3. 3. The method of claim 1, further comprising the water pumps and the pumping check gates at the bank of the tidal power basins for pumping water to the waterworks through pumping pipes.
  4. 4. The method of claim 2, further comprising the water pumps and the pumping check gates at the bank of the tidal power basins for pumping water to the waterworks through pumping pipes.
  5. 5. The method of claims 1 or 2 or 3 or 4, further comprising spillways at the tidal power basins for safety.
  6. 6. The method of claims 1 or 2 or 3 or 4, further comprising the hydraulic turbine and generator sets at the flooding gates to increase generated electricity.
  7. 7. The method of claims 1 or 2 or 3 or 4, further comprising spillways at the tidal power basins for safety and the hydraulic turbine and generator sets at the flooding gates to increase generated electricity.
  8. 8. A tidal power generation method substantially as hereinbefore described with reference to the accompanying drawings.
  9. 9. A tidal power generation system substantially as hereinbefore described with reference to the accompanying drawings.
    Amendments to the claims have been filed as follows Claims: 1. A tidal power generation system using water from a river comprising a tidal power basin at the seacoast, sluice gates at the s tidal power basin, and a hydraulic turbine and generator set at the tidal power basin, characterized in that diversion gates are provided at a high elevation position of the river, flooding gates are provided at a water intake of the tide! power basin, and guiding pipes are provided interconnecting the diversion gates and the flooding gates To for supplying water for power generation.
    2. A method of operating a tidal power generation system as claimed in Claim 1 comprising the steps of: (a) closing the sluice gates for storing water and opening the is diversion gates and the flooding gates to divert water from the river to the tidal power basin through the guiding pipes; (b) opening the sluice gates to let water flow out from the tidal power basin to rotate the hydraulic turbine and generator set for generating electricity prior to flowing into the sea; go (c) closely watching the water intake and water consumption for continuing the power generation; and (d) repeating steps (a) and (b).
    3. A system as claimed in Claim 1, further comprising water :5 pumps and pumping check gates adjacent the tidal power basin for pumping water to a waterworks.
    4. A method as claimed in Claim 2, further comprising the provision of water pumps and pumping check gates adjacent the tidal power basin for pumping water to a waterworks.
    5. A system as claimed in Claim 1 or Claim 3, further comprising spillways at the tidal power basin.
    6. A system as claimed in Claim 1 or Claim 3, further comprising hydraulic turbine and generator sets at the flooding gates to increase the amount of generated electricity.
    7. A system as claimed in Claim 5, further comprising hydraulic turbine and generator sets at the flooding gates to increase the amount of electricity generated.
    8. A method as claimed in Claim 2 or Claim 4, further comprising the provision of hydraulic turbine and generator sets at the flooding gates to increase the amount of generated electricity.
    ho 9. A system as claimed in Claim 1 or Claim 3, further comprising spillways at the tidal power basin for improved safety and hydraulic turbine and generator sets at the flooding gates to increase the amount of generated electricity.
  10. 10. A method as claimed in Claim 2 or Claim 4, further comprising the provision of spillways at the tidal power basin for improved safety and the provision of hydraulic turbine and generator sets at the flooding gates increase the amount of generated electricity.
  11. 11. A tidal power generation method substantially as hereinbefore described with reference to the accompanying drawings.
  12. 12. A tidal power generation system substantially as hereinbefore described with reference to the accompanying To drawings.
GB0514274A 2004-11-18 2005-07-12 Tidal power generation method and system using water from rivers Expired - Fee Related GB2417759B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW093135512A TWI295338B (en) 2004-11-18 2004-11-18 A tidal power generation method with water from rivers

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GB0514274D0 GB0514274D0 (en) 2005-08-17
GB2417759A true GB2417759A (en) 2006-03-08
GB2417759B GB2417759B (en) 2006-08-23

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015176956A1 (en) * 2014-05-21 2015-11-26 Voith Patent Gmbh Method for operating a tidal power plant

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59150814A (en) * 1983-02-15 1984-08-29 Otokichi Ishizuka Power generation by combined use of estuary dam and high-tide water pumping type power plant

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59150814A (en) * 1983-02-15 1984-08-29 Otokichi Ishizuka Power generation by combined use of estuary dam and high-tide water pumping type power plant

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015176956A1 (en) * 2014-05-21 2015-11-26 Voith Patent Gmbh Method for operating a tidal power plant

Also Published As

Publication number Publication date
TWI295338B (en) 2008-04-01
GB2417759B (en) 2006-08-23
ES2323100B2 (en) 2009-11-26
TW200617279A (en) 2006-06-01
ES2323100A1 (en) 2009-07-06
GB0514274D0 (en) 2005-08-17

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Owner name: KUN SHAN UNIVERSITY

Free format text: FORMER APPLICANT(S): YI, JWO-HWU

PCNP Patent ceased through non-payment of renewal fee

Effective date: 20100712