BG110063A - Pontoon water-power station - Google Patents

Pontoon water-power station Download PDF

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Publication number
BG110063A
BG110063A BG110063A BG11006308A BG110063A BG 110063 A BG110063 A BG 110063A BG 110063 A BG110063 A BG 110063A BG 11006308 A BG11006308 A BG 11006308A BG 110063 A BG110063 A BG 110063A
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BG
Bulgaria
Prior art keywords
pontoon
working channel
chains
short
confuser
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BG110063A
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Bulgarian (bg)
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BG66263B1 (en
Inventor
Христо СТАНКОВ
Румен ВАТАШКИ
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Христо СТАНКОВ
Румен ВАТАШКИ
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Application filed by Христо СТАНКОВ, Румен ВАТАШКИ filed Critical Христо СТАНКОВ
Priority to BG10110063A priority Critical patent/BG66263B1/en
Priority to PCT/BG2008/000021 priority patent/WO2009103131A2/en
Publication of BG110063A publication Critical patent/BG110063A/en
Publication of BG66263B1 publication Critical patent/BG66263B1/en

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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
    • F03B17/00—Other machines or engines
    • F03B17/06—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head"
    • F03B17/062—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head" with rotation axis substantially at right angle to flow direction
    • F03B17/063—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head" with rotation axis substantially at right angle to flow direction the flow engaging parts having no movement relative to the rotor during its rotation
    • F03B17/064—Other machines or engines using liquid flow with predominantly kinetic energy conversion, e.g. of swinging-flap type, "run-of-river", "ultra-low head" with rotation axis substantially at right angle to flow direction the flow engaging parts having no movement relative to the rotor during its rotation and a rotor of the endless-chain type
    • 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
    • F03B11/00—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator
    • F03B11/08—Parts or details not provided for in, or of interest apart from, the preceding groups, e.g. wear-protection couplings, between turbine and generator for removing foreign matter, e.g. mud
    • 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
    • F03B13/264—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 using the horizontal flow of water resulting from tide movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/10—Stators
    • F05B2240/12—Fluid guiding means, e.g. vanes
    • F05B2240/122—Vortex generators, turbulators, or the like, for mixing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/10—Stators
    • F05B2240/13—Stators to collect or cause flow towards or away from turbines
    • F05B2240/133—Stators to collect or cause flow towards or away from turbines with a convergent-divergent guiding structure, e.g. a Venturi conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2240/00—Components
    • F05B2240/90—Mounting on supporting structures or systems
    • F05B2240/93—Mounting on supporting structures or systems on a structure floating on a liquid surface
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/60—Fluid transfer
    • F05B2260/63—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles
    • 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)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Oceanography (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Hydraulic Turbines (AREA)

Abstract

The pontoon water-power station is used in hydraulic-power engineering for the production of electricity by converting the kinetic energy of flowing water. It comprises a pontoon (3), to which there are fixed a confuser (5) and a diffuser (7) connected therebetween by a working channel (6), vortex generators (8) being installed in the confuser (5) and the diffuser (7). Along the working channel (6) on the pontoon (3) there are mounted converters (4), the outputs of their axes (16) being connected to electric generators (9). On the axes (16) of the converters (4) there are fixed large (12) and small (13) gears / belt pulleys respectively connected to long (14) and short (15) chains / gear belts. On long pins (19) and short (20) pins fixed respectively on the long chains / gear belts (14) and short chains / gear belts (15) there are attached the separate blade groups (18), each blade component of a blade group (18) is inclined toward the axis of the working channel (6). The pontoon (3), which is a foundation and floor of an engine room (10), is held stationary with respect to the flow through anchors (2) in the bottom of the water basin, while the produced electricity is transmitted from the pontoon (3) to the shore by a power transmission cable (11).

Description

Област на приложениеField of application

Изобретението се отнася до понтонна водноелектрическа централа, която намира приложение в хидроенергетиката при производството на електроенергия чрез преобразуване на кинетичната енергия на течаща вода.The invention relates to a pontoon hydroelectric plant that is used in hydropower in the production of electricity by converting the kinetic energy of flowing water.

Предшестващо състояние на техникатаBACKGROUND OF THE INVENTION

Известни са проточни водноелектрически централи, които съчетават ускорителни съоражения (конфузор - дифузори) с различни типове водни колела или турбинен тип преобразуватели. Нетурбинните преобразуватели като правило са значително по-прости, лесни за изпълнение и експлоатация. При тези конструкции не са предвидени възможности за ускоряване на свободно течащия поток. Това ограничава тяхното приложение - при ниски скорости на потока резултатът е нисък коефициент на полезно действие и малки мощности на изхода към електрогенераторите (1).Flow-through hydroelectric power plants are known which combine acceleration facilities (confuser - diffusers) with different types of water wheels or turbine type converters. Non-turbine converters are generally simpler, easier to operate and operate. These structures do not provide for the possibility of accelerating the free-flowing flow. This limits their application - at low flow rates, the result is a low efficiency and low output power to the generators (1).

Техническа същност на изобретениетоSUMMARY OF THE INVENTION

Задачата на изобретението е да се създаде понтонна водноелектрическа централа, която да съчетава предимствата на нетурбинните способи за преобразуване на кинетичната енергия на речния поток или на морско или океанско течение с високата ефективност на флуидодинамичните хеликоидални технически решения за генериране на електроенергия. За целта изобретението съчетава проявлението на хидродинамични и тягови принципи за отнемането на енергията от водния поток и преобразуването й в електроенергия.It is an object of the invention to provide a pontoon hydroelectric plant that combines the advantages of non-turbine methods for converting kinetic energy to river flow or sea or ocean current with the high efficiency of fluid-dynamic helicoidal technical solutions for generating electricity. To this end, the invention combines the manifestation of hydrodynamic and traction principles for the removal of energy from water flow and its conversion into electricity.

Задачата е решена с понтонна водноелектрическа централа, чиито два основни елемента са ускорителна система и преобразувател. В ускорителната система в съответствие с принципа на Бернули се създават условия за увеличаване скоростта на естествения воден поток чрез конфузор - дифузор и вихрогенератори. По протежение на понтона е разположен работният канал, който свързва конфузора и дифузора.Неговото сечение е по-малко от сечението на входа на конфузора и обуславя съответстващо увеличаване на скоростта на водния поток спрямо величината й преди ускорителната система. Вихрогенериращите устройства мултиплицират инициираното чрез принципа на Бернули ускорение на потока.The problem is solved with a pontoon hydropower plant, the two main elements of which are the accelerator system and the converter. The acceleration system, in accordance with the Bernoulli principle, creates the conditions for increasing the speed of natural water flow through a confuser - diffuser and vortex generators. Along the pontoon is the working channel that connects the confuser and the diffuser. Its cross section is smaller than the cross section at the inlet of the confuser and causes a corresponding increase in the velocity of the water flow relative to its value before the acceleration system. Vortex generators multiply the flow acceleration initiated by the Bernoulli principle.

При протичането през преобразувателя ускореният воден поток в работния канал задвижва чрез натиск върху няколко лопатни групи гъвкави трансмисии - елеваторен тип вериги или ремъци. Чрез тях линейното движение на потока се преобразува в ротационно. Веригите/ремъците предават движението на две групи зъбни колела или ремъчни шайби, съответно неподвижно закрепени върху две хоризонтални оси. От изходите на осите механичното въртеливо движение се предава на съответен брой генератори на електроенергия.When flowing through the converter, the accelerated water flow in the working channel is driven by pressure on several blades of flexible transmissions - elevator type chains or belts. Through them, the linear flow of the flow is converted into a rotational one. The chains / belts transmit the movement of two groups of gears or belt washers, respectively, fixed to two horizontal axes. From the outputs of the axes, the mechanical rotary motion is transmitted to an appropriate number of electricity generators.

Лопатните групи на всеки преобразувател са разположени под ъгъл, по-малък от 45 градуса спрямо вектора на скоростта на потока в работния канал. Всяка група лопати е разделена на две подгрупи, разположени с противоположен наклон спрямо централната осThe blades of each converter are arranged at an angle of less than 45 degrees with respect to the velocity vector of the working channel. Each group of blades is divided into two subgroups, located at an opposite inclination to the central axis

на работния канал. Всяка следваща лопатна група е с огледално разположение на лопатите спрямо предшестващата. Работещи са лопатните групи, потопени в работния канал. Същевременно ъгълът на лопатите спрямо вектора на скоростта на потока създава условия за действие на сили на натиск на водата върху тях, които се предават върху гъвкавите трансмисии, а чрез тях - върху зъбните колела/ремъчните шайби. Полученото ротационно движение върху двете оси на преобразувателя се предава към съответен брой генератори на електрическа енергия. В зависимост от скоростта на потока в работния канал и площта на лопатите в потопените лопатни групи са възможни различни параметри на въртящия момент и на ъгловата скорост на преобразувателя.on the work channel. Each subsequent blade group has a mirror position of the blades relative to the previous one. Blades submerged in the working channel are working. At the same time, the angle of the blades relative to the velocity vector creates conditions for the action of water pressure forces on them, which are transmitted to the flexible transmissions and, through them, to the gears / pulleys. The resulting rotational motion on the two axes of the converter is transmitted to a corresponding number of electricity generators. Depending on the flow velocity in the working channel and the area of the blades in the submerged blades, different parameters of torque and angular velocity of the converter are possible.

Предимствата на изобретението се състоят в това, че се гарантира независимост от сезонните или други приливно - отливни колебания на водното ниво. Не се инвестира в земя и прилежаща инфраструктура, минимизират се редица рискове от земетресение, наводнение и т. н. Възможна е мобилност на понтонната водноелектрическа централа до конкретен потребител, както и модулно увеличаване на мощността чрез присъединяване на следващ понтон преди дифузора. Многократно се използва едно и също количество вода, без ни най-малко да се влошават нейните енергийни характеристики. Високата ъглова скорост на изхода на преобразувателите предпоставя използването на високооборотни електрогенератори с по-добро съотношение тегло - мощност от традиционно използваните в хидроенергетиката бавнооборотни генератори.The advantages of the invention are that it guarantees independence from seasonal or other tidal fluctuations at the water level. It does not invest in land and associated infrastructure, minimizes a number of risks of earthquake, flood, etc. Mobility of the pontoon hydroelectric power plant to a specific user is possible, as well as modular increase of the power by joining another pontoon before the diffuser. Repeatedly use the same amount of water without compromising its energy performance. The high angular velocity at the output of the transducers presupposes the use of high-speed electric motors with a better weight-to-power ratio than traditionally used in hydropower slow-speed generators.

Пояснение на приложените фигуриExplanation of the annexed figures

Примерното изпълнение на полезния модел е показано на приложените фигури, от които:An exemplary embodiment of the utility model is shown in the accompanying figures, of which:

Фигура 1. представлява принципна схема на ПВЕЦ;Figure 1 is a schematic diagram of an HPP;

Фигура 2 . представлява схематичен поглед отстрани на ПВЕЦ;Figure 2. is a schematic side view of an HPP;

Фигура 3. представлява принципна схема на преобразувател - поглед отгоре с показани две огледално разположени лопатни групи;Figure 3 is a schematic diagram of a converter - top view showing two mirror-mounted blade groups;

Фигура 4. представлява схематичен разрез на преобразувател А-А.Figure 4 is a schematic sectional view of converter AA.

сp

Примерно изпълнение на изобретениетоAn exemplary embodiment of the invention

Понтонната водноелектаческа централа, съгласно изобретението включва предпазно съоръжение 1, което защитава конфузора 5 и понтона 3 от влачени от течението твърди тела. Към понтона 3 са фиксирани конфузор 5 и дифузор 7, свързани помежду си чрез работен канал 6. В конфузора 5 и дифузора 7 са монтирани вихрогенератори 8. По протежение на работния канал 6 върху понтона 3 са монтирани преобразуватели 4, а изходите на техните оси 16 са свързани с електрогенератори 9. Върху осите 16 на преобразувателите 4 са фиксирани големи зъбни колела/ремъчни шайби 12 и малки зъбни колела/ремъчни шайби 13, свързани съответно с дълги вериги/зъбни ремъци 14 и къси вериги/зъбни ремъци 15. Върху дълги шпилки 19 и къси шпилки 20, фиксирани съответно върху дългите вериги/зъбни ремъци 14 и късите вериги/зъбни ремъци 15 са закрепени отделните лопатни групи 18. Всяка отделна лопата 21, влизаща в състава на една лопатнаThe pontoon hydroelectric plant according to the invention includes a safety device 1 that protects the confuser 5 and the pontoon 3 from solids drawn by the stream. To the pontoon 3 are fixed confuser 5 and diffuser 7, connected to each other through a working channel 6. In the confuser 5 and the diffuser 7 are mounted vortex generators 8. Along the working channel 6 on the pontoon 3 are mounted transducers 4, and the outputs of their axes 16 are connected to power generators 9. Large gears / pulleys 12 and small gears / pulleys 13 are attached to the axes 16 of the transducers 4, connected respectively to long chains / timing belts 14 and short chains / timing belts 15. Long splines / timing belts 15. 19 and short studs 20, fixed respectively individual blade groups 18 are attached to the long chains / timing belts 14 and the short chains / timing belts 15. Each individual blade 21 is part of a single blade.

група 18, е наклонена спрямо оста на работния канал 6 под ъгъл, по-малък от 45 градуса. Неподвижното състояние на понтона 3 спрямо течението е осигурено от анкери 2 в дъното на водния басейн.Понтонът 3 едновременно е фундамент и под на машинната зала 10 на ПВЕЦ. Произведената електроенергия се предава към мрежата чрез електропреносен кабел 11 от понтона 3 към брега.group 18, is inclined toward the axis of the working channel 6 at an angle of less than 45 degrees. The stationary state of the pontoon 3 upstream is provided by the anchors 2 at the bottom of the water basin. The pontoon 3 is at the same time the foundation and floor of the HPP engine room 10. The electricity generated is transmitted to the grid via an electricity transmission cable 11 from the pontoon 3 to the shore.

Понтонната водноелектрическа централа действа по следния начин:The pontoon hydroelectric plant operates as follows:

Ускореният воден поток чрез конфузора 5 и вихрогенераторите 8 попада в работния канал 6, където осъществява натиск върху лопатите 21 на лопатните групи 18, които последователно се потопяват в работния канал 6. Чрез дългите шпилки 19 и късите шпилки 20 натискът върху лопатите 21 се прехвърля върху дългите вериги/зъбни ремъци 14 и късите вериги/зъбни ремъци 15, а чрез тях - върху големите зъбните колела/ремъчните шайби 12 и малките зъбни колела/ремъчни шайби 13. Тъй като големите и малките зъбни колела/ремъчни шайби са неподвижно закрепени върху осите на преобразувателя 16, на четирите краища на осите на преобразувателя 4 се получава ротационно движение, което в крайна сметка се предава на осите на електрогенераторите 9. Аналогично се задействат всички преобразуватели 4, монтирани по протежение на работния канал 6.The accelerated water flow through the confuser 5 and the vortex generators 8 falls into the working channel 6, where it presses on the blades 21 of the blade groups 18, which are subsequently immersed in the working channel 6. Through the long studs 19 and the short studs 20, the pressure on the blades 21 is transferred to long chains / timing belts 14 and short chains / timing belts 15 and through them on large gears / pulleys 12 and small gears / pulleys 13. Because large and small gears / pulleys are fixed on the wheels on reobrazuvatelya 16 of the four corners of the axis of the converter 4 receives a rotary motion, which finally is transmitted to the axles of the electric generator 9. Similarly trigger all transducers 4 mounted along the work channel 6.

Литература:Literature:

1. US Patent № 4 868408,19891. U.S. Patent No. 4,868,408,1989

Claims (3)

ПАТЕНТНИ ПРЕТЕНЦИИPatent Claims 1. Понтонна водноелектрическа централа, включваща ускорителна система и преобразувател, характеризираща се с това, че към понтона /3/ са фиксирани конфузор /5/ и дифузор /7/, свързани помежду си чрез работен канал /6/ като в конфузора /5/ и дифузора /7/ са монтирани вихрогенератори /8/, а по протежение на работния канал /6/ върху понтона /3/ са монтирани преобразуватели /4/, като изходите на техните оси /16/ са свързани с електрогенератори /9/, върху осите /16/ на преобразувателите /4/ са фиксирани големи зъбни колела/ремъчни шайби /12/ и малки зъбни колела/ремьчни шайби /13/, свързани съответно с дълги вериги/зъбни ремъци /14/ и къси вериги/зъбни ремъци /15/, върху дълги шпилки /19/ и къси шпилки /20/, фиксирани съответно върху дългите вериги/зъбни ремъци /14/ и късите вериги/зъбни ремъци /15/ са закрепени отделните лопатни групи /18/ като всяка отделна лопата /21/, влизаща в състава на една лопатна група /18/, е наклонена спрямо оста на работния канал /6/, а неподвижното състояние на понтона /3/, който е фундамент и под на машинна зала /10/, спрямо течението е осигурено от анкери /2/ в дъното на водния басейн като произведената електроенергия се предава чрез електропреносен кабел /11/от понтона /3/ към брега.1. A pontoon hydroelectric plant comprising an accelerator system and a converter, characterized in that a confuser (5) and a diffuser (7) are connected to the pontoon (7), connected to each other by a working channel (6) as in the confuser (5). and diffusers / 7 / are mounted vortex generators / 8 /, and along the working channel / 6 / on the pontoon / 3 / transducers / 4 are mounted, the outputs of their axes / 16 / are connected to generators / 9 /, on the axles / 16 / of the transducers / 4 / are fixed large gears / belt washers / 12 / and small gears / belt washers / 13 / connected respectively to long chains / timing belts / 14 / and short chains / timing belts / 15 /, on long studs / 19 / and short studs / 20 /, fixed respectively to long chains / timing belts / 14 / and the short chains / timing belts / 15 / are attached to the individual blade groups / 18 / with each individual blade / 21 / forming part of one blade group / 18 / being inclined towards the axis of the working channel / 6 / and the stationary state of the pontoon / 3 /, which is the foundation and floor of the engine room / 10 /, relative to the stream is provided by anchors / 2 / at the bottom of the water basin electricity is transmitted by an electric transmission cable / 11 / from the pontoon / 3 / to the shore. 2. Понтонна водноелектрическа централа съгласно претенция 1, характеризираща се с това, че всяка отделна лопата /21/, влизаща в състава на една лопатна група /18/, е наклонена спрямо оста на работния канал /6/ под ъгъл, по-малък от 45 градуса.A pontoon hydroelectric plant according to claim 1, characterized in that each individual shovel (21), which is part of a shovel group (18), is inclined towards the axis of the working channel (6) at an angle less than 45 degrees. 3. Понтонна водноелектрическа централа съгласно претенция 1, характеризираща се с това, че всяка следваща лопатна група /18/ е разположена огледално спрямо предшестващата.3. A pontoon hydroelectric plant according to claim 1, characterized in that each subsequent blade group (18) is positioned in a mirror view of the previous one.
BG10110063A 2008-02-20 2008-02-20 Pontoon water-power station BG66263B1 (en)

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