WO2008121646A1 - Système de conversion de l'énergie des vagues à radeau articulé composé de barges-ponts - Google Patents

Système de conversion de l'énergie des vagues à radeau articulé composé de barges-ponts Download PDF

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Publication number
WO2008121646A1
WO2008121646A1 PCT/US2008/058244 US2008058244W WO2008121646A1 WO 2008121646 A1 WO2008121646 A1 WO 2008121646A1 US 2008058244 W US2008058244 W US 2008058244W WO 2008121646 A1 WO2008121646 A1 WO 2008121646A1
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WO
WIPO (PCT)
Prior art keywords
barge
barges
preexisting
housing
wave
Prior art date
Application number
PCT/US2008/058244
Other languages
English (en)
Inventor
Michael Mccormick
Original Assignee
Ocean Energy System, Llc.
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.)
Filing date
Publication date
Application filed by Ocean Energy System, Llc. filed Critical Ocean Energy System, Llc.
Publication of WO2008121646A1 publication Critical patent/WO2008121646A1/fr

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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
    • 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
    • F03B13/14—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 wave energy
    • F03B13/16—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 wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/20—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 wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" wherein both members, i.e. wom and rem are movable relative to the sea bed or shore
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/138—Water desalination using renewable energy
    • Y02A20/144—Wave 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

Definitions

  • Described herein is a passive technique for improving the efficiency of a wave- following, articulated raft wave-energy system.
  • the motion-enhanced system is promising for the production of potable water for coastal communities and island communities.
  • One aspect of the application relates to a wave-powered device, including a first barge; a second barge; a third barge; a first coupling mechanism coupled between the first and the second barges to enable the first and second barges to move relative to one another; and a second coupling mechanism coupled between the second and third barges to enable the second and third barges to move relative to one another, the first barge including first and second preexisting barges of predetermined size and shape selected from a group of preexisting barges, the first and second preexisting barges being coupled together to form and act as a single, unitary barge, and the first and second preexisting barges being structured and arranged to optimize predetermined wave conditions.
  • Another aspect of the application relates to a method of forming a wave- powered device, comprising: selecting first and second preexisting barges of predetermined size and shape from a group of preexisting barges for forming a first barge assembly; coupling the first and second preexisting barges together in an arrangement to optimize wave conditions and to form the first barge; coupling the first barge to a second barge to enable the first and second barges to move relative to one another; and coupling the second barge to a third barge to enable the second and third barges to move relative to one another.
  • a compressed air motion attenuator assembly for use in a wave-powered device, comprising: a cylindrical housing; end plugs positioned at opposite ends of the housing; and a piston and shaft assembly positioned and moveable within the housing, with the shaft extending out from the housing, the housing including breathing slots extending through the housing and having a predetermined length along the housing, the housing forming an air trap at each of the two ends of the housing, the slots and air traps being structured and arranged such that air is compressed when the piston travels beyond the slots at either end of the housing, and the air traps being a predetermined size based on the compressibility of the entrapped air.
  • FIG. 1 illustrates a three-barge articulated system designed for potable-water production in accordance with the invention
  • Fig. 2 illustrates a U-tube hydraulic system designed to increase the pitching angle of the center barge in accordance with the invention
  • Fig. 3 illustrates a tuning system for the forward 10 and after 18 barges using the U-tube in accordance with the invention
  • FIG. 4 illustrates a displacement configuration of the wave-following articulated barge system in a design wave, where L/ ⁇ - 0.5, in accordance with one embodiment of the invention
  • FIG. 5 illustrates an articulated barge system composed of Flexifloat barges in accordance with another embodiment of the invention
  • Fig. 6 illustrates a portion of an articulated barge system in accordance with another embodiment of the invention.
  • Fig. 7 illustrates a portion of an articulated barge system in accordance with another embodiment of the invention.
  • FIG. 8 illustrates a portion of an articulated barge system in accordance with another embodiment of the invention.
  • FIG. 9 illustrates a compressed air motion attenuator in accordance with another embodiment of the invention.
  • Fig. 10 illustrates a portion of an articulated barge system in accordance with another embodiment of the invention
  • FIG. 1 A computer-generated picture of an articulated barge system is shown in Fig.
  • the system preferably may be comprised of three barges of differing lengths.
  • the forward barge 10 is the barge facing into the waves.
  • the wave action causes the barge to rise and fall in a rotational fashion about the hinges 12 coupling this barge to the center barge 14. It has been found that this barge is capable of capturing approximately 60% of the incident wave energy.
  • Barges excite the pumps 16 located over the hinges. These pumps 16 are preferably hydraulic pumps designed to draw in salt water, pre-filter the water and pump the water at high pressure to a reverse-osmosis (RO) desalination plant. Depending on the application and product water (potable water) requirements of the system, the RO can be on shore or on the deck of the after barge 18 of the system.
  • RO reverse-osmosis
  • the center barge 14 preferably has a length that is less than half of the forward barge 10 length, by design. This ensures that the relative angular displacements of each barge will be relatively large.
  • the after barge 18 is preferably the longest of the three for two reasons.
  • FIG. 1 There are two types of motion enhancement of the system sketched in Fig. 1 provided by passive hydraulic systems. By the term “passive”, it is meant that the system needs no adjustment during deployment.
  • the motion enhancements involve the tuning of the forward 10 and after 18 barges to a selected wave period, and the motion increasing hydraulic moment of the center barge 14.
  • Fig. 2 illustrates a U-Tube hydraulic system designed to increase the pitching angle of the center barge.
  • the hydraulic valve 40 controls the losses in the pipes 24 connecting the forward 30 and after 32 reservoirs.
  • the check valves 42 at the top of each reservoir 30, 32 is designed to prevent water entering the breathing (air) pipe 44.
  • the pneumatic valve 46 at the top can be used to add resistance to the transport of the water between the reservoirs 30, 32.
  • FIG. 2a we see the internal U-Tube hydraulic system 20 designed to increase the angular displacement of the center barge 14. Referring to Fig. 2b, this is done by shifting the center of mass of the water 22 in the hydraulic system towards either the bow-down side or the stern-down side. In Fig. 2b, we see the bow-down orientation of the center barge 14. In Fig. 2b, the counterclockwise displacement of the center barge 14 causes the water 22 to shift in the U-Tube 24 towards the left-hand side (bow side 26). This would occur during the passing of a trough of a wave.
  • the volume of fresh water within the hydraulic system is determined from both performance predictions in a design sea, and the ballast requirements of the system.
  • the reservoirs should be separated by a relatively large transfer pipe 24 in order to produce a high pitching moment.
  • the weight of the water 22 acts as ballast, and will help determine the operating draft of the system.
  • Fig. 3 illustrates a tuning system for the forward 10 and after 18 barges using the U-Tube.
  • the bi-directional air pump is needed to change the water level when deployed.
  • the float check valves 42 prevent water from entering the air line 44.
  • the forward 10 and after 18 barges should be in resonance with the incident waves. Pitching about the hinges 12 attaching the barge-pairs (forward-and-center and center-and-after) is the production motion of system.
  • the natural pitching period of each barge 10, 14, 18 depends on the ballast and the location of the center of gravity.
  • the U-Tube technique can be used to tune the pitching motions of the barges 10, 14, 18 to the design wave period.
  • the U-Tube tuning system is sketched for the forward barge 10.
  • the water 22 is initially transferred from one reservoir 30 to the other 32.
  • the water 22 transfer would move the center of gravity of the barge 10 forward of its as-designed position. This would increase the natural pitching period of the barge 10 from the as- designed value.
  • Fig. 4 illustrates a displacement configuration of the wave-following articulated barge system in a design wave, where L/ ⁇ - 0.5.
  • the pitching angle amplitudes would be increased, increasing the relative angles between the barge-pairs. This would, in turn, increase the strokes on the pumps above the hinges.
  • Fig. 5 illustrates an articulated barge system composed of Flexifloat barges
  • the system shown is preferably, approximately 138 feet in length.
  • the length ratio is L/ ⁇ - 0.55, which is nearly optimal. This length coupled with the U-Tube enhancement systems would result in optimal performance.
  • a system can be constructed using the Flexifloat 110, 114, 118 barges or some other commercially available barges. Using the Series S-70 Flexifloat 110,
  • 114, 118 barges to illustrate the system is shown in Fig. 5.
  • the system shown in Fig. 5 is approximately 138 feet in length, which is about 55% of the design wavelength corresponding to a 7-second wave.
  • the system in Fig. 5, from bow to stern, consists of the following:
  • the pumps are preferably salt-water pumps of special design. These are located 4 feet above the hinges.
  • Figs. 6-8 illustrated additional embodiments of the invention wherein component deck barges and end-rakes may be configured in an articulated-raft wave-energy conversion system.
  • the reasons for creating an articulate-raft wave-energy conversion system composed of deck barges are at least twofold: first, the construction of the system is simplified by using commercially-available deck barges and end-rakes. These component barges are designed to be coupled together in a variety of ways, including an end- wise configuration, a side-wise configuration, and/or a composition of the two.
  • a second reason for using the deck barges in the wave-energy application is that it allows for an on-site change in the configuration to enhance the system-performance for local sea conditions.
  • the system can be lengthened or widened to either resonate with the incident wave (where the motions period are equal to the design wave period) or be spatially-sympathetic to the incident wavelength (where the total system length equals the wavelength, half of the wavelength, etc.).
  • This system 210 includes two or more in-line rafts that are hinged together.
  • the rafts are composed of a series of deck-barges, arranged in a variety of ways, including in-line, transversely, and/or a combination of the two.
  • the deck-barge components are illustrated in Figure 6, where two rectangular deck-barges 212 and 214 and an end-rake barge 216 component are shown.
  • the length (L), width (W) and depth (D) of the rectangular barges 212 and 214 may be the same or combinations thereof.
  • the end-rake 216 dimensions are such that they are compatible with the barge configuration.
  • over the connecting hinges are located water pumps designed to deliver sea water to an RO system to produce potable water, to a salt-water irrigation system and/or other systems.
  • FIG. 7 Two articulated-raft configurations consisting of deck-barge and end-rake components are shown in Figures 7 and 8.
  • an in-line configuration 220 is shown consisting of (a) two 40-footlong deck-barges 222, (b) two 20-foot long deck-barges 224 and (c) one end-rake 226.
  • This system 220 is designed to be spatially-sympathetic to the incident wavelength.
  • a short and wide system 230 is shown consisting of (a) six 20-foot long deck-barges 224, (b) two 40-foot long deck-barges 222 and (c) two end-rakes 226.
  • This system 230 is designed to be exposed to a wider wave crest than the system in Fig. 7. Furthermore, system 230 is more stable in rolling than the system 220 in Fig. 7. It
  • iOC should be understood that the systems 210, 220, and 230 are simply illustrations of the many possible configurations possible. For example, it might be found that the performance of the system is enhanced by adding an end-rake 226 to the stern of the system 220 in Fig. 7,or adding two end-rakes 226 to the system 230 in Fig. 8. It should be understood that the dimensions used above are only example dimensions as the dimensions of the barges and end-rakes may vary as desired and/or depending on a particular application.
  • the articulated-raft wave-energy conversion system composed of deck barges and end-rakes has numerous design advantages, including ease in construction (the component barges are commercially available from such corporations as Robishaw. The Robishaw Corporation sells the units known as Flexifloats. These commercially-available components are designed to be coupled on-site), and on-site adjustment (by adding or subtracting component barges on-site, the performance of the system can be enhanced either by being more sympathetic to the period of the design wave, or being more sympathetic to the length of the design wave).
  • FIGs. 9 and 10 illustrate an embodiment of a compressed air motion attenuator 250 in accordance with the invention that may be employed, for example, on any of the systems disclosed above.
  • the attenuator 250 may be used, for among other reasons, to prevent the coupled barges from damaging each other, for example, when used in rough weather.
  • the attenuator may take various forms.
  • the illustrated embodiment of the attenuator 250 includes a cylindrical housing 251 for receiving a piston 252 coupled to a shaft 253.
  • the housing 251 includes breathing (air intake/exhaust) slots 254 that extend though the housing 251 and that are positioned around the housing 251.
  • the housing 251 also receives end plugs 255 at each end of the housing 251 that permit the shaft 253 to extend there through.
  • the air is compressed when the piston 252 travels beyond the breathing (air intake/exhaust) slots 254 at either end.
  • the size of compressed air traps 256 depends on the compressibility of the entrapped air which, in turn, is determined on the air's bulk modulus of elasticity.
  • Figs. 1-5 DC disclosed in Figs. 1-5.
  • the embodiments disclosed herein may be used with other devices, including with other articulated raft systems.
  • the embodiments of Figs. 6-8 maybe employed to improve the performance of other articulated raft systems, such as, for example those disclosed in the U.S. patents identified above and incorporated herein by reference.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Dispositif entraîné par les vagues, comprenant une première barge; une deuxième barge; une troisième barge; un premier mécanisme de couplage couplé entre la première et la deuxième barge afin de permettre à la première et à la deuxième barge de se déplacer l'une par rapport à l'autre; et un second mécanisme de couplage couplé entre la deuxième et la troisième barge afin de permettre à la deuxième et à la troisième barge de se déplacer l'une par rapport à l'autre, La première barge comprenant une première et une deuxième barge préexistante ayant une taille et une forme prédéterminées choisies parmi un groupe consistant en des barges préexistantes, la première et la deuxième barge préexistante étant couplées ensemble afin de former et d'agir comme une seule barge unitaire, et la première et la deuxième barge préexistante étant structurées et disposées afin d'optimiser des conditions de vagues prédéterminées. De plus, ensemble d'atténuateur de mouvement à air comprimé destiné à être utilisé dans un dispositif entraîné par les vagues, comprenant un logement cylindrique; des embouts positionnés aux extrémités opposées du logement; et un ensemble de piston et d'arbre positionné et mobile dans le logement, avec l'arbre s'étendant vers l'extérieur depuis le logement, le logement comprenant des fentes d'aération s'étendant dans le logement et ayant une longueur prédéterminée le long du logement, le logement formant une poche d'air à chacune des deux extrémités du logement, les fentes et les poches d'air étant structurées et disposées afin que l'air soit comprimé lorsque le piston se déplace au-delà des fentes à n'importe quelle extrémité du logement, et les poches d'air ayant une taille prédéterminée basée sur la compressibilité de l'air piégé.
PCT/US2008/058244 2007-03-30 2008-03-26 Système de conversion de l'énergie des vagues à radeau articulé composé de barges-ponts WO2008121646A1 (fr)

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US92081307P 2007-03-30 2007-03-30
US60/920,813 2007-03-30

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2472469A (en) * 2009-08-07 2011-02-09 Korea Electric Power Corp WEC with floats pivoted with 2 degrees of freedom
GB2472470A (en) * 2009-08-07 2011-02-09 Korea Electric Power Corp Variable liquid column oscillator using wave energy
CN102384013A (zh) * 2011-07-28 2012-03-21 董万章 漂浮式水浪能量采集转换系统
CN102490875A (zh) * 2011-12-12 2012-06-13 王桂林 水上平台抗风暴潜浮控制装置及方法
CN102616341A (zh) * 2012-04-01 2012-08-01 海南创冠智能网络技术有限公司 一种波浪能收集船
WO2015172272A1 (fr) * 2013-10-08 2015-11-19 陈文彬 Equipement de generation d'energie a liaison de bouees multiples
CN105484934A (zh) * 2016-02-14 2016-04-13 河海大学 一种可采集波浪能的海上漂浮式风力发电平台及集聚群
US11408391B2 (en) 2016-03-01 2022-08-09 Mocean Energy Ltd. Wave power device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5132550A (en) * 1988-10-19 1992-07-21 Hydam Limited Wave powered prime mover
WO2006006864A1 (fr) * 2004-06-23 2006-01-19 Hans-Olav Ottersen Convertisseur de l'energie des vagues, multiphase et multidimensionnel
US20060208494A1 (en) * 2005-03-18 2006-09-21 Cook Glen E Wave powered electric generating device
US20060273593A1 (en) * 2003-04-04 2006-12-07 Ocean Power Delivery Limited Wave power apparatus
KR20060130875A (ko) * 2005-06-09 2006-12-20 이승규 파력 발전장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5132550A (en) * 1988-10-19 1992-07-21 Hydam Limited Wave powered prime mover
US20060273593A1 (en) * 2003-04-04 2006-12-07 Ocean Power Delivery Limited Wave power apparatus
WO2006006864A1 (fr) * 2004-06-23 2006-01-19 Hans-Olav Ottersen Convertisseur de l'energie des vagues, multiphase et multidimensionnel
US20060208494A1 (en) * 2005-03-18 2006-09-21 Cook Glen E Wave powered electric generating device
KR20060130875A (ko) * 2005-06-09 2006-12-20 이승규 파력 발전장치

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8304925B2 (en) 2009-08-07 2012-11-06 Korea Electric Power Corporation Movable object type high-efficiency wave energy apparatus
GB2472470A (en) * 2009-08-07 2011-02-09 Korea Electric Power Corp Variable liquid column oscillator using wave energy
GB2472469B (en) * 2009-08-07 2011-11-23 Korea Electric Power Corp Movable object type high-efficiency wave energy apparatus
GB2472470B (en) * 2009-08-07 2011-11-23 Korea Electric Power Corp Variable liquid column oscillator using wave energy
GB2472469A (en) * 2009-08-07 2011-02-09 Korea Electric Power Corp WEC with floats pivoted with 2 degrees of freedom
WO2013013534A1 (fr) * 2011-07-28 2013-01-31 Dong Wanzhang Système flottant de collecte et de conversion d'énergie houlomotrice
CN102384013B (zh) * 2011-07-28 2012-12-19 董万章 漂浮式水浪能量采集转换系统
CN102384013A (zh) * 2011-07-28 2012-03-21 董万章 漂浮式水浪能量采集转换系统
CN102490875A (zh) * 2011-12-12 2012-06-13 王桂林 水上平台抗风暴潜浮控制装置及方法
CN102490875B (zh) * 2011-12-12 2014-05-07 王桂林 水上平台抗风暴潜浮控制装置及方法
CN102616341A (zh) * 2012-04-01 2012-08-01 海南创冠智能网络技术有限公司 一种波浪能收集船
WO2015172272A1 (fr) * 2013-10-08 2015-11-19 陈文彬 Equipement de generation d'energie a liaison de bouees multiples
CN105484934A (zh) * 2016-02-14 2016-04-13 河海大学 一种可采集波浪能的海上漂浮式风力发电平台及集聚群
US11408391B2 (en) 2016-03-01 2022-08-09 Mocean Energy Ltd. Wave power device

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