ES2383786A1 - Hybrid solar heat power generation device - Google Patents

Hybrid solar heat power generation device Download PDF

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Publication number
ES2383786A1
ES2383786A1 ES201090049A ES201090049A ES2383786A1 ES 2383786 A1 ES2383786 A1 ES 2383786A1 ES 201090049 A ES201090049 A ES 201090049A ES 201090049 A ES201090049 A ES 201090049A ES 2383786 A1 ES2383786 A1 ES 2383786A1
Authority
ES
Spain
Prior art keywords
receiver
support post
heliostats
art
solar heat
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
ES201090049A
Other languages
Spanish (es)
Other versions
ES2383786B2 (en
Inventor
Kazuaki Ezawa
Takashi Kawaguchi
Toshihiko Maemura
Kounosuke Oku
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.)
Mitsui Engineering and Shipbuilding Co Ltd
Original Assignee
Mitsui Engineering and Shipbuilding 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.)
Filing date
Publication date
Priority to JP2008041941A priority Critical patent/JP4463308B2/en
Priority to JP2008-041941 priority
Application filed by Mitsui Engineering and Shipbuilding Co Ltd filed Critical Mitsui Engineering and Shipbuilding Co Ltd
Priority to PCT/JP2008/073869 priority patent/WO2009104347A1/en
Publication of ES2383786A1 publication Critical patent/ES2383786A1/en
Application granted granted Critical
Publication of ES2383786B2 publication Critical patent/ES2383786B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S40/00Safety or protection arrangements of solar heat collectors; Preventing malfunction of solar heat collectors
    • F24S40/20Cleaning; Removing snow
    • F24J2/07
    • F24J2/10
    • F24J2/18
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S20/00Solar heat collectors specially adapted for particular uses or environments
    • F24S20/20Solar heat collectors for receiving concentrated solar energy, e.g. receivers for solar power plants
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S23/79Arrangements for concentrating solar-rays for solar heat collectors with reflectors with spaced and opposed interacting reflective surfaces
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S2023/83Other shapes
    • F24S2023/833Other shapes dish-shaped
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S23/00Arrangements for concentrating solar-rays for solar heat collectors
    • F24S23/70Arrangements for concentrating solar-rays for solar heat collectors with reflectors
    • F24S2023/87Reflectors layout
    • F24S2023/874Reflectors formed by assemblies of adjacent similar reflective facets
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy
    • Y02E10/41Tower concentrators

Abstract

Device for generating energy from solar heat comprising a support pole (4) that includes a receiver (1) that receives sunlight; and a plurality of heliostats (6) that are provided concentrically around the support post (4) and that reflect sunlight towards the receiver (1). The support post (4) includes at least two receivers (1a, 1b) that are arranged in the up and down directions. The receiver (1a) provided in an upper side position receives reflected lights L1 from the heliostats (6a) located in distant positions, and the receiver (1b) provided in a lower side position receives reflected lights L2 from the heliostats (6b). ) located in close positions.

Description

Device for generating energy from solar heat.

TECHNICAL FIELD

The present invention relates to an energy generating device that uses solar heat. More specifically, the present invention relates to an energy generating device that uses solar heat, whose energy is capable of increasing the efficiency of the collection of light reflected by heliostats and, therefore, is capable of improving the efficiency of the generation of energy

BACKGROUND OF THE TECHNIQUE

Recently, there has been an increase in interest in the global environment such as: global warming caused by exhaust gases produced by the combustion of fossil fuels; and the depletion of fossil fuels. In addition, an alternative energy that can replace the aforementioned fossil fuels has attracted more public attention. Alternative energies such as wind power generation and photovoltaic power generation have been extended.

Meanwhile, there is a device for generating energy from solar heat of the concentration type in which a heat transfer medium is heated by the use of heat produced by the concentration of solar rays, steam is produced by heat From the heat transfer medium, a steam turbine is driven by steam and, consequently, electrical energy is generated. The device has attracted public attention because the device can operate similarly to power generation facilities such as a conventional thermal power plant and can achieve a high output level.

Various types of energy generating devices from solar heat of the concentration type have been proposed so far, including a solar heating power generation device of the feed channel type (see, for example, Document 1 of the Patent ), a device for generating solar heating energy of the plate type (see, for example, Document 3 of the Patent), and a device for generating energy from solar heat of the tower type (see, for example, Document 2 of the Patent). The feeding channel type device includes: reflectors each having a semicircular section shape and having a light reflection surface formed on a surface thereof, pipes that extend in the axial directions of the respective reflectors, and A heat transfer medium is introduced into the pipes. The tower type device includes: a tower placed in the center and provided with a heating part of the heat transfer medium on an upper part thereof; and multiple heliostats placed around the tower. The plate-type device includes: a plate-shaped reflector that has a light reflective surface formed on a surface thereof; and a heating part of the transfer medium always close to the reflector.

In addition, a solar heating power generation device of the falling beam system has been proposed (see, for example, Non-Patent Document 1). The device for generating energy from solar heat from the descending beam system includes a large number of heliostats arranged around the center; a heat transfer medium heating unit arranged in a lower part; and a curved reflector mirror (central reflector) always above the heating unit of the heat transfer medium.

Patent Document 1: WO2005 / 017421

Patent Document 2: Kokai Publication No. 2004-169059 of Japanese Patent Application.

Patent Document 3: Kokai Publication No. 2005-106432 of Japanese Patent Application.

Non-Patent Document 1: Solar Energy, Volume 62, Number 2, February 1998, p. 121-129 (9).

DESCRIPTION OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

(Bucket Type)

The reflector of the energy generating device from solar heat of the cuvette type has a fairly large dimension in the direction of the width of the reflector. A large number of reflectors are arranged in lines and rows, and give rise to the problem that the device for generating energy from solar heat needs a large enough area to install the reflectors.

(Type Plate)

The device for generating energy from solar heat of the plate type is a device of compact size because each reflector plate collects sunlight and heats the heat transfer medium. There is a limit on the size of each reflector plate. Consequently, the device for generating energy from solar heat of the plate type has the problem of being unsuitable for the generation of energy on a massive scale.

 (Tower Type)

The power generating device from solar heat of the tower type has the following problem. As Figure 9 shows, a receiver 105 has a surface 105a for receiving irradiated light with reflected light R109, a light from each heliostat 102 that is located outside a tower 100. The incident angle 81 of the reflected light R109 within the light receiving surface 105a is approximately a right angle. That incident angle 81 decreases the area irradiated with the reflected light R109, and increases the amount of light per unit area. The illuminance is therefore improved and the higher illuminance results in a greater amount of heat collected by each heliostat 102. The light receiving surface 105a is also irradiated with a reflected light R108, a light from each heliostat 101 which is located near the tower 100. The incident angle 82 of the reflected light R108 within the light receiving surface 105a is an acute angle. That incident angle 82 increases the area irradiated with the reflected light R108, and decreases the amount of light per valley area. The illuminance is therefore reduced and the lower illuminance causes a smaller amount of heat collected by each heliostat 101.

Assuming that the thermal efficiency of heat reception is represented by sen 8 (incidence angle), the thermal efficiency of heat reception for each heliostat 102 located in the furthest position is approximately 100%, and that relative to each heliostat 101 located in the near position is approximately 50%.

(Descending beam type)

The device for generating energy from falling solar heat has the following problem. As shown in Figure 10, a central reflector 116 has a reflection surface 116a. A reflected light R119, a light from each heliostat 112 that is located away from the central reflector 116 enters the reflection surface 116a forming an acute incidence angle. Expressing this differently, the reflected light R109 enters the center of the reflector 116 in a rather oblique manner that causes a larger area of the central reflector 116 irradiated with the reflected light R119 from each heliostat 112 that is located in the far position. Consequently, the thermal efficiency of heat collection is lower.

In addition, even when heliostats are provided in an area that has a radius of approximately several hundred meters, the central reflector must be approximately 100 m in diameter. A central reflector of this size can weigh several hundred tons. The heavy central reflector poses a problem of strength of the structure to support the central reflector.

(Present Invention)

In view of the aforementioned problems of conventional techniques, an object of the present invention is to provide a device for generating energy from solar heat capable of achieving greater illuminance by reducing the area of the irradiated receiver with the reflected light that it is projected, on the receiver, for each heliostat located far from the receiver.

MEANS TO SOLVE THE PROBLEMS

A device for generating energy from hybrid solar heat according to the present invention has the following configuration.

1) The device for generating energy from solar heat includes: a support post that includes a receiver that receives sunlight; and a plurality of heliostats that are provided to surround the support post coaxially and reflect sunlight towards the receiver. The device for generating energy from solar heat is characterized in that the support post includes at least two receivers that are arranged in the upper and lower direction, the receiver located in the upper position receiving the reflected light from the heliostats located in remote positions, and the receiver in a lower position receives reflected light from the heliostats located in nearby positions.

2) The device for generating energy from solar heat is characterized in that, when the light intensity of a reflected light received by a receiver with an incidence angle of 90 degrees is 100%, each of the receivers receives each reflected light from heliostats located in positions such that an intensity of 60% or greater is achieved for each reflected light received by the corresponding receiver.

3) The device for generating energy from solar heat is characterized in that an incident angle of the light reflected by each heliostat located away from the support post towards the receiver provided in the upper position is set between 75º to 105º, and an angle The incidence of the light reflected by each of the heliostats located near the support post towards the receiver provided in the lower position is set between 75º to 105º.

4) The device for generating energy from solar heat includes: a support post that includes receivers that receive sunlight; and a plurality of heliostats that are provided so that they surround the support post coaxially and reflect sunlight towards the receivers. The device for generating energy from solar heat is characterized in that one of the receivers is provided in a superior position on the support post, the receiver receives reflected light from heliostats located in remote positions, and a central reflector is provided in a lower position on the support post, the central reflector receiving reflected light coming from the heliostats located near the support post, and another of the receivers is provided below the central reflector, the receiver receiving sunlight reflected by the central reflector .

5) The device for generating energy from solar heat is characterized in that at least three support posts are assembled together to form a pyramid, a column type body is provided so that it extends upwardly from the upper end sides of the support posts, a central reflector is fixed to the support posts that have been assembled together to form the pyramid shape, in addition, receivers are provided below the central reflector and on the body of the column, the receiver provided on the body from the column receives reflected light that comes from the heliostats away from the support posts, and the central reflector receives reflected lights from heliostats near the support posts, and the receiver provided on the support posts receives the light transmitted to the receiver by the central reflector.

6) The device for generating energy from solar heat includes: the support post equipped with the central reflector; and the plurality of heliostats provided so that they surround the support post. The device for generating energy from solar heat is characterized by including: an arc-shaped frame that fits into a wall surface of the central reflector that has a semicircular arcuate section shape, the frame having one of its ends supported by the support post; a cleaning robot that is fixed to the frame so that it is capable of movements along the frame; and movement means for moving the frame with the cleaning robot in a circumferential direction to the central reflector; and the device for generating energy from solar heat characterized in that the cleaning robot includes a spraying device that sprays a cleaning liquid on the surface of the central reflector wall.

7) The device for generating energy from solar heat is characterized in that the receiver provided below the central reflector includes a conical light receiving portion, and dust prevention means to allow the transmission of sunlight through of these but blocking the entrance of dust, such as sandy are provided to cover the entrance of light for the sunlight formed in the potion of reception of light.

8) The solar heat generating device is characterized in that a receiver is provided in an upper position on a support post to receive the reflected lights of the plurality of heliostats concentrically provided around the support post, and the surface The receiver receiving light is configured as a cup so that the angle of incidence of the reflected light coming from each of the plurality of heliostats can have a right angle or near the right angle with respect to the receiving surface of the light.

EFFECTS OF THE INVENTION

1) In the device for generating energy from solar heat, the receiver provided in an upper position on the support post receives the reflected light from the heliostats located in remote positions in which the receiver provided in a lower lower position on the support post receives the reflected light from the heliostats located in nearby positions. In addition, the light receiving plate of each receiver has a depression angle so that the reflected light coming from each receiver can form a right or approximately right angle with the light receiving plate. Consequently, an incident angle of 90 ° or approximately 90 ° is achieved with the light receiving plate of each receiver for each corresponding reflected light from the heliostats located in an area that extends from positions close to the support post to positions away from the same. With such an incident angle, the reflected light entering the corresponding receiver can form a small area of irradiation, and thus greater illuminance can be achieved. The increased illuminance increases the amount of heat received by the receiver, and improves the efficiency of heat exchange with molten salt. Consequently, more heat can be generated.

2) The device for generating energy from solar heat uses more efficiently the reflected light from heliostats distributed in an area that extends from near positions to distant positions. Consequently, a device for generating energy from solar heat on a larger scale can achieve greater production capacity.

3) The cleaning robot removes sand and dust that adheres to the surface of the central reflector. Although that dust and sand would otherwise make the central reflector reflect light towards the receiver less efficiently, the cleaning robot can prevent that lower efficiency from occurring.

4) Without the dust prevention means, sandy dust particles entering the receiving portion of the receiver's light would dirty the surface of the inner wall of the receiving light portion, resulting in a lower efficiency of heat exchange with Liquefied salt Dust prevention means can avoid that lower heat exchange efficiency.

5) Each light receiving plate is configured in a way that can achieve an incidence angle of 90 ° or an angle close to 90 ° for the reflected light transmitted on the corresponding light receiving plate by the heliostats provided in an area which extends from nearby positions to remote positions. This angle of incidence increases the amount of heat collected by each receiver, causing an increase in the amount of energy generated. In addition, an increase in thermal efficiency of heat collection for reflected light from heliostats located in remote positions can be achieved. Consequently, a device for generating energy from solar heat on a larger scale can be constructed to achieve greater output capacity.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram illustrating a device for generating energy from solar heat according to the present invention.

Figure 2 is a schematic sectional diagram illustrating a receiver of the device for generating energy from solar heat according to the present invention.

Figure 3 is a graph illustrating the incident angle of sunlight that extends over the receiver and the area irradiated with sunlight.

Figure 4 is a graph illustrating the incident angle of sunlight that extends over the receiver and the amount of energy generated.

Figure 5 is a diagram illustrating a device for generating energy from solar heat according to

a second embodiment of the present invention.

Figure 6 is a schematic diagram illustrating a cleaning apparatus.

Figure 7 is a diagram illustrating a device for generating energy from solar heat according to

a third embodiment of the present invention.

Figure 8 is a schematic diagram illustrating a receiver of the power generating device from solar heat according to the third embodiment of the invention.

Figure 9 is a schematic diagram illustrating a device for generating energy from conventional tower-type solar heat.

Figure 10 is a schematic diagram illustrating a device for generating energy from conventional down-beam solar heat.

Figure 11 is a graph illustrating the amount of energy generated and the radius of the area in which the heliostats are provided. DESCRIPTION OF SYMBOLS A1, A2, A3 devices for generating energy from solar heat

solar light L1, L2, L3, L11, L12, L21, L22 reflected lights c1 short distance section c2 medium distance section c3 long distance section 1a, 1b, 1c, 11a, 12, 21a, 22 receivers 4, 14, 24 support pose 6a, 6b, 6c, 16a, 16b, 26a, 26b heliostats 13, 23 central reflectors 22a opening portion

22b light collection portion

BETTER MODE OF PRACTICEING THE INVENTION

Hereinafter, a device for generating energy from solar heat according to the present invention will be described with reference to the drawings.

REALIZATION 1

Figure 1 is a schematic diagram illustrating a device A1 for generating energy from solar heat according to the present invention. The power generating apparatus A1 from solar heat includes plural receivers 1a, 1b and 1c which are provided on a support post 4 and arranged in this order from top to bottom. Each of the receivers 1a, 1b, and 1c, is a heat exchanger that absorbs solar heat and transfers heat to a heat transfer medium. Multiple heliostats 6a, 6b and 6c are concentrically provided around the support post 4 with the receivers 1a, 1b, 1c. Each heliostat 6 includes a reflecting mirror m made of a plurality of small mirror plates that reflect sunlight, that is, solar heat.

As Figure 2 shows, each receiver 1 includes a heat receiving plate 1a and a pipe 9 as a heat transfer medium. The receiving plate 1a is a conical shaped member that connects multiple plate-shaped heat absorbers. The heat transfer medium pipe 9 is wound a plurality of times around the internal circumference of the heat receiving plate 1a. Each heliostat 6 includes a device for tracking sunlight S and a driving device for operating a reflector mirror vertically and horizontally. Each heliostat 6 is controlled to reflect sunlight S towards the corresponding receiver

one.

As Figure 1 shows, the receiver 1a located in the highest position on the support post 4 is intended to receive a reflected light R1 that comes from the heliostats 6a located away from the support post 4. The receiver 1b located in the middle position on the support post 4 is intended to receive a reflected light R2 from each of the heliostats 6b located in an intermediate position. The receiver 1c located in the lowest position on the support post 4 is intended to receive a reflected light R3 from each of the heliostats 6c located in the vicinity of the support post 4.

The angle of incidence of each of the reflected lights R1, R2, and R3 corresponding to the receivers 1a, 1b and 1c is adjusted by controlling the angle of the light receiving plate 1a of each of the receivers 1a, 1b and 1c . The incidence angles are adjusted so that the intensities corresponding to the reflected light can be equal to

or greater than 60%.

Specifically, as Figure 2 shows, the angle of incidence of each of the lights R1, R2 and R3 varies from the smallest angle of incidence � = 75 ° to the greater angle of incidence y = 105 °. As Figure 3 shows, the irradiation efficiency of the sunlight distributed on the light receiving plate 1a is the highest when the angle of incidence of the sunlight within the light receiving plate 1a is 90 ° ( that is, in the case of perpendicular incidence). As the angle of incidence becomes less than or greater than 90 °, the thermal efficiency of the irradiation decreases rapidly in an exponential manner. Consequently, the angle of incidence is designed to vary from 75 ° to 105 ° because an angle of incidence within this range guarantees an intensity of the reflected light that is equal to or greater than 60%.

In addition, the light receiving plate 1a is fixed to establish an inclination angle a with the axial direction of the support post 4. The inclination angle a is adjusted so that the incident angles of reflected light R1, R2 and R3 from the corresponding heliostats 1a, 1b and 1c can be within a range of 75 ° to 105 °.

Now, it is assumed that the area formed on the solar light receiving plate 1a reflected when the incidence angle is 100 °. When the angle of incidence is between 75 ° and 105 °, the area formed on the solar light receiving plate 1a that is obliquely projected thereon has an angle of incidence that is not greater than 104 °. Consequently, even the heliostat that does not transmit sunlight perpendicularly on the plate 1a that receives light can have an irradiation efficiency that is equal to or greater than 60%.

In addition, as Figure 4 shows, since the incident angle of reflected light distributed on the light receiving plate 1a is restricted within a range of 75 ° to 105 °, including the heliostat whose angle of incidence of the sunlight transmitted on the 1st reception plate deflects more than 90 ° can have an energy generation efficiency that is equal to or greater than 60%.

As Figure 4 (illustrating the angle of incident and the efficiency of power generation) shows, the angle of incidence is adjusted within a range of 75º to 105º so that the efficiency of power generation can be equal to or greater 60% Consequently, as Figure 4 shows, once the incident angle is out of the aforementioned range, the amount of power generation decreases exponentially. Assuming that the amount of energy generated with the incident angle of 90 ° is 100, even the heliostat whose incident angle of sunlight transmitted on the light receiving plate 1a deviates more than 90 ° can maintain an amount of energy generation that is equal or greater than 60%.

As Figure 1 shows, heliostats 6 are divided into groups and are individually adjusted so that the incident angle of the reflected light R1, R2 and R3 within the corresponding receiver 1a, 1b and 1c can be maintained within the aforementioned range. Specifically, a short distance section C1, a middle distance section C2, and a long distance section C3 are formed in this order from the area closest to the support post 4 outwards. Heliostats 6a, 6b and 6c are located in their corresponding sections C1, C2 and C3. Heliostats 6a, 6b and 6c are individually adjusted so that sunlight can be distributed over their corresponding predetermined receivers 1a, 1b and 1c, and, in addition, are adjusted so that the incident angle of each of the reflected lights R1, R2 and R3 that are distributed on their corresponding receivers 1a, 1b and 1c may be within the aforementioned range (a range of 75 ° to 105 °).

Specifically, in this embodiment, the heights at which the receivers 1a, 1b and 1c are positioned are: approximately 105 m for the receiver 1a for long distance (the height h3); approximately 60 m for receiver 1b for medium distance (height h2); and approximately 30 m for the receiver 1c for short distance (height h1). The sections described above are the long distance section C3, the middle distance section C2 and the short distance section C1 which are approximately 100 m to 400 m, approximately 50 m to 200 m, and approximately 15 m to 60 m, of separation of the support post 4. Consequently, the incident angle of each reflected light R1, R2 and R3 applied on their corresponding receivers 1a, 1b and 1c can be maintained within a range of 75 ° to 105 °.

In the solar heat generating device A1 having the configuration described above, the predetermined receivers 1a, 1b and 1c receive their corresponding reflected light R1, R2 and R3 which are distributed by heliostats 6. Therefore, the Heat transfer medium (such as a molten salt containing 40% sodium nitride, 7% sodium nitrate, and 53% potassium nitrate, for example) supplied to receivers 1a, 1b and 1c is heated to approximately 500 ° C. Then the high temperature molten salt is introduced into the heat exchanger and then provided to the support post 4, to generate steam, which drives a turbine power generator to generate electrical energy.

The molten salt that has been heated by the receivers is stored in a high temperature molten salt tank, and is then sent to the heat exchanger, in which the molten salt is used to generate electrical energy. Then, the molten salt is stored in a low temperature molten salt tank. The high temperature molten salt tank stores an amount of molten salt capable of accumulating heat that is sufficient to generate electricity even while solar heat is not available, for example, at night. Consequently, electric power can be generated incessantly day and night.

In this embodiment, plural receivers are provided on the support post so that the incident angle of 90 ° or a similar angle can be achieved for each reflected light that are distributed by the heliostats on their corresponding receivers. Consequently, the area of reception of light on each of the receivers on which the lights reflected from the corresponding heliostats are distributed are so small that the illuminance is very strong. Consequently, the amount of solar heat collected increases so that the amount of heat provided to the molten salt also increases. As a result, more electrical energy can be generated.

In addition, the device for generating energy from solar heat on a larger scale can significantly increase the amount of heat collected, so that mass scale energy generation may be possible.

REALIZATION 2

In this embodiment, as shown in Figure 5, a receiver 11a is provided in a higher position on a support post 14 so that a central reflector 13 and a receiver 12 are provided in lower positions on the support post 14 . The central reflector 13 consists of multiple reflector mirrors 13a each of which has a small form of specular plate. The multiple reflector mirrors 13a are joined together forming the central reflector 13 in the form of a bowl which has a semicircular arc sectional shape. The central reflector 13 is fixed by means of a plurality of cables 13c or a plurality of hanging means 13c fixed to the support post 14c.

A recessed portion of heat collection is formed on the upper surface of the receiver 12 provided in the lowest position. The low heat collection portion accepts the reflected light from the central reflector

13. Multiple pipes of the heat transfer medium are provided so that they surround the recessed portion, and solar heat can be provided to the heat transfer medium by means of these pipes of the heat transfer medium.

As shown in Figure 5, multiple heliostats 16 are concentrically provided around the support post 14. The heliostats 16 are divided into a group of heliostats 16b located near the support post 14 and another group of heliostats 16a located away from the support post 14. Each of the heliostats 16b located in nearby positions sheds a reflected light R11 of sunlight S on the central reflector 13 while each of the heliostats 16a located in remote positions sheds a reflected light R12 on the receiver 11a provided in the position upper on the support post 14. In addition, the reflected light R12 that has been transmitted on the central reflector 13 is collected by the receiver 12 located in the lower position.

The heliostats 16b located in nearby positions and the heliostats 16a located in remote positions as well as the receiver 11a and the central reflector 13 are individually adjusted so that each of the light receiving areas formed on the receiver 11a and on the central reflector 13 can be so small that they make their illuminance stronger. To achieve small areas of light reception, each of the incident angles of the incident light is a right angle or an approximately right angle. Specifically, as in the case of the first embodiment, the incident angle is within a range of 75 ° to 105 °.

The central reflector 13 is equipped with cleaning means G that clean a wall surface (mirror mirror surface) of the central reflector 13. As Figure 6 shows, the cleaning means G are configured in an arc shape that can be adapted to the wall surface 13a of the central reflector 13. The cleaning means G includes a frame f, a cleaning robot GR, and a dragging device m2. The lower end side of the frame f is supported on the support post 14. The cleaning robot GR is fixed to the frame f so that it is able to move along the frame f. The dragging device m2 moves the frame f, to which the cleaning robot GR is fixed, along the circumferential direction of the central reflector 13.

The frame f is configured of small width to reduce the blocking of the reflected light that is distributed on the central reflector 13. In addition, the frame f is made of a heat-resistant alloy to resist the heat of the high temperature produced by the reflected light transmitted by heliostats 6. Incidentally, the alloy is a light weight. Some examples of usable alloys for this purpose are high nickel / iron content such as Inconel® alloy and Hastelloy® alloy.

The upper end side of the frame f is connected to a drive device m1 which is provided on the ring-shaped perimeter edge portion of the central reflector 13. The drive device m1 and the drive device m2 provided on the lower end side of the frame f move the frame f. It should be borne in mind that the frame f can be one of the type flown with the drive device m2 provided on the post 14 which is support only for the frame f.

The cleaning robot GR includes a cleaning device n, which sprays a cleaning liquid on the surface 13c of the wall of the central reflector 13. The cleaning device n includes a spray nozzle and similar tools for the purpose of washing, with water, dust or similar substances that adhere to the surface 13c of the wall. In the area surrounding the cleaning device n, a synthetic resin cover is provided to prevent the washing liquid from leaking out. The cleaning liquid is collected and filtered by a filtration device, and then pulverized by the nozzle. To express it differently, the liquid is circulated and reused. Alternatively, the nozzle can spray hot water or steam obtained using heat from the heat transfer medium (molten salt) for power generation.

The cleaning means G are designed to operate while none of the reflected lights R11 and R12 enters the reflector, for example, at night. The cleaning means G are manufactured to be automatically operated at night by means of a computer.

It should be borne in mind that, although the heliostats 6 distribute the solar heat on the central reflector 13, the cleaning robot GR is held in a position at the upper end or at the lower end of the frame f so that the robot GR of Cleaning can avoid the influence of solar heat. In the Northern Hemisphere, the heliostat located on the north side of the central reflector 13 receives stronger sunlight than the heliostat located on the south side of it. Consequently, the frame f is moved to the south side of the central reflector 13, and therefore both the influence of solar heat and the existence of the blockage can be reduced.

In this embodiment, the support post 14 is equipped with the receivers 11a and 12, and is also equipped with the central reflector 13. The reflected light R12 from the heliostats 16b located near the support post 14 is cast on the central receiver 13 so that the reflected light from the heliostats 16a located away from the support post 14 is applied to the receiver 11a. Consequently, reflected lights from heliostats located in sections from a position close to the support post 14 to a distant position can be received very efficiently by receivers 11a and 12.

Consequently, even if heliostats are provided in an area (measured in terms of radius) that is approximately the same as the corresponding area in conventional cases, the amount of power generation can increase as shown in Figure 11. In addition, a significant increase in the power generation capacity it can be achieved by a larger-scale power generation device of this class.

REALIZATION 3

The device of this embodiment, as shown in Figure 7, includes a receiver 21a that is provided on an upper part of a column-shaped body 25. In addition, the support posts 24 are provided so that they open downward to adopt a pyramid shape. A central reflector 23 is provided in the space thus formed under the support posts 24. A receiver 22 is provided below the central reflector 23.

A light collection portion 22b is configured on the upper side of the receiver 22. The light collection portion 22b has a crucible shape, and collects the solar heat reflected by the central reflector 23. A heat exchange portion 22c is formed on the underside of the receiver 22. A pipe 22f as a heat transfer means is wound around the outer circumference of the heat exchange portion 22c.

The inner wall of the light collection portion 22b has a mirror surface so that solar heat can be reflected within the collection portion 22b and can be introduced into the heat exchange portion 22c located below.

An open portion 22a is formed in the portion 22b of the receiver 22 provided below the central reflector 23. Dust prevention means are provided on the open portion 22a. Although sunlight (solar heat) can pass through the dust prevention means g, a dust such as sand cannot pass through the dust prevention means g. An example of the dust prevention means g is a cover plate made of boric silicate glass or the like.

Without the dust prevention means g, a powder such as sand can enter into the light collection portion 22b of the receiver 22 through the open portion 22a of the light collection portion 22b, and can soil the mirror surface and heat exchange portion 22f, resulting in low efficiency in the collection of light and lower efficiency in heat exchange. Dust prevention means can prevent dust from entering, and therefore this reduction in efficiencies can be prevented. The receiver 22 has a height of approximately 5 m, so that it is not easy to clean the inside of the receiver 22. By providing the means g of dust prevention, the user can avoid the problem of performing maintenance work for the receiver

22

In this embodiment, the reflected light that comes from each of the heliostats located in remote positions is received by the receiver provided on the upper side, so that the reflected light that comes from each of the heliostats located in nearby positions is received firstly through the reflector center provided on the lower side, and then passed over the receiver provided on the ground. Consequently, an incident angle that is similar to a right angle can be achieved for sunlight that is distributed by heliostats located in sections of positions close to remote positions. Consequently, the intensity of the light with which the receiving surface of the receiver's light is irradiated is greater. The greater intensity of the light allows more steam to be generated, resulting in an increase in the ability to generate energy.

In addition, the pyramid-shaped support posts provided to support the central reflector provide greater resistance to the support structure, resulting in an improvement in both earthquake resistance and wind resistance.

In addition, the dust prevention means are provided to cover the light input of the receiver provided below the central reflector. This prevents the reduction of the heat exchange efficiency between the molten salt and the reflected light, which would otherwise be caused by a dust such as sand that soils the specular surface of the interior of the light collecting portion 22b.

In addition, the receiver provided below the central reflector includes the light receiving portion with a crucible shape, a difficult way for the heat of the incident light thereof. Consequently, greater thermal efficiency can be achieved.

Claims (5)

  1. A power generating device from solar heat comprising: a support post (14) that includes receivers (11a) that receive sunlight; and a plurality of heliostats (16a, 16b) that are provided so that they surround the support post (14)
    and that reflect sunlight towards the receptors (11a),
    the device for generating energy from solar heat characterized in that
    receivers (11a) are supplied in an upper position on the support post (14), receiving
    the light reflected from the receiver (16a) of the heliostats located in remote positions, and a central reflector (13a) is provided in a lower position on the support post (14), the central reflector (13a) receiving reflected light coming from heliostats (16a) located near the support post (14), and other receivers (12) located below the central reflector (13a), receiving the receiver (12) sunlight reflected by the central reflector (13a).
  2. 2. A device for generating energy from solar heat characterized in that
    at least three support posts (24) are assembled together to form a pyramid,
    a column body (25) is provided so that it extends upwardly from the upper end sides of the support posts (24),
    a central reflector (23) is fixed to the support posts (24) that have been assembled together to form the pyramid,
    in addition, receivers (22, 21a) are provided below the central reflector (13a) and on the column body (25),
    the receiver (21a) provided on the column body (25) receives reflected lights that come from the heliostats (26a) provided away from the support posts (24), and
    the central reflector (23) receives reflected lights from the heliostats (26b) located near the support posts (24), and the receiver (22) receives light that passes over the receiver (22) through the reflector (23) central.
  3. 3. The device for generating energy from solar heat according to claim 1, including the support post (14) equipped with the central reflector (13); and the plurality of heliostats (16a, 16b) provided so that they surround the support post (14),
    the device for generating energy from solar heat being characterized in that it comprises:
    a frame (f) configured in an arc shape that adapts to a central reflecting mirror surface (13) having a semicircular arched sectional shape, the frame (f) having one of its ends supported by the post (14) of support;
    a cleaning robot (GR) that is fixed to the frame (f) so that it is able to move along the frame (f) that includes a spraying device (n) that sprays a cleaning liquid onto the wall surface of the central reflector (13) and
    movement means (m1, m2) to move the frame with the cleaning robot in a circumferential direction of the central reflector
  4. 4. The device for generating energy from solar heat according to claim 2; characterized because
    The receiver (22) provided below the central reflector (23) includes a conical light receiving portion (22b), and
    dust prevention means (g) to allow the transmission of sunlight through them but block the entry of the sand-type dust are provided to cover the light inlet (22a) for the sunlight formed in the portion ( 22b) of light reception.
    SPANISH OFFICE OF THE PATENTS AND BRAND
    Application no .: 201090049
    SPAIN
    Date of submission of the application: 12.27.2008
    Priority Date:
    REPORT ON THE STATE OF THE TECHNIQUE
    51 Int. Cl.: See Additional Sheet
    RELEVANT DOCUMENTS
    Category
    56 Documents cited Claims Affected
    TO
    US 2007 023079 A1 (MILLS DAVID et al.) 01.02.2007, 1.2
    paragraphs [51,52]; Figure 1.
    TO
    US 2003041856 A1 (BLACKMON JAMES B et al.) 06.03.2003, 1.2
    paragraphs [31-34]; figures.
    TO
    ES 8201723 A1 (INTERATOM) 16.03.1982, 1.2
    page 5, lines 4-16; Figure 1.
    TO
    US 5578140 A (YOGEV AMNON et al.) 26.11.1996, 1.2
    column 7, lines 25-31; figure 2.
    Category of the documents cited X: of particular relevance Y: of particular relevance combined with other / s of the same category A: reflects the state of the art O: refers to unwritten disclosure P: published between the priority date and the date of priority submission of the application E: previous document, but published after the date of submission of the application
    This report has been prepared • for all claims • for claims no:
    Date of realization of the report 13.06.2012
    Examiner J. Merello Arvilla Page 1/4
    REPORT OF THE STATE OF THE TECHNIQUE
    Application number: 201090049
    CLASSIFICATION OBJECT OF THE APPLICATION F24J2 / 18 (2006.01)
    F24J2 / 07 (2006.01) F24J2 / 10 (2006.01) Minimum documentation sought (classification system followed by classification symbols)
    F24J
    Electronic databases consulted during the search (name of the database and, if possible, terms of search used) INVENTIONS, EPODOC, WPI
    State of the Art Report Page 2/4
     WRITTEN OPINION
    Application number: 201090049
    Date of Completion of Written Opinion: 06.13.2012
    Statement
    Novelty (Art. 6.1 LP 11/1986)
    Claims Claims 1-4 IF NOT
    Inventive activity (Art. 8.1 LP11 / 1986)
    Claims Claims 1-4 IF NOT
    The application is considered to comply with the industrial application requirement. This requirement was evaluated during the formal and technical examination phase of the application (Article 31.2 Law 11/1986).
     Opinion Base.-
    This opinion has been made on the basis of the patent application as published.
    State of the Art Report Page 3/4
     WRITTEN OPINION
    Application number: 201090049
     1. Documents considered.-
    The documents belonging to the state of the art taken into consideration for the realization of this opinion are listed below.
    Document
    Publication or Identification Number publication date
    D01
    US 2007 023079 A1 (MILLS DAVID et al.) 01.02.2007
  5.  2. Statement motivated according to articles 29.6 and 29.7 of the Regulations for the execution of Law 11/1986, of March 20, on Patents on novelty and inventive activity; quotes and explanations in support of this statement
    Document D01 is considered the closest in the state of the art to the invention according to the claims of the patent application object of this Written Opinion. The numerical references used are relative to document D01. Hereinafter, the same terminology as the claims of the patent application under study will be used. Document D01 presents a device for generating energy from solar heat comprising:
    -
    a support post (16) that includes receivers (18, 20) that receive sunlight,
    -
    a plurality of heliostats (12) surrounding the support post (16),
    where:
    -
    the receiver (18) is in an upper position on the support post (16),
    -
    a beam splitter (14) is disposed in a lower position on the support post (16),
    -
    the receiver (20) is located below the beam splitter (14) in such a way that it receives reflected light from the
    same.
    The system according to D01 differs from that proposed in the first claim under study in that heliostats
    (12) of document D01 direct all solar radiation towards the beam splitter (14) and it is this that is responsible for the division of the same and its distribution to the solar receivers (18, 20). On the contrary, in the device according to the first claim of the patent application, heliostats furthest from the support post direct the solar radiation directly, without passing through another reflector or through a beam splitter, towards the solar receiver located in the The upper part of the support post and the heliostats closest to the support post direct the solar radiation towards a reflector (not a beam splitter) which forwards it to a solar receiver located at the bottom of the support post. Therefore, the configuration of the system according to D01, although it is similar to that proposed by the first claim under study, has structural differences that make it work in a different way. It is not considered obvious to a person skilled in the art that it is based on document D01 to reach the solution proposed by the first claim of the patent application. Therefore, the invention, according to the first claim of the patent application, because it is not included in the state of the art is new (Law 11/1986, Art.6.1.) And, since it is not the same in a way obvious to an expert in the field, it has inventive activity (Law 11/1986, Art.8.1.). Since the first claim has a novelty and inventive activity, the dependent claim thereof, that is claims 3, also presents novelty (Law 11/1986, Art.6.1.) And inventive activity Law 11/1986, Art.8.1.) .
    The invention according to claim 2 of the patent application under study basically presents a solar installation as proposed in the first claim but introduces an additional difference with respect to document D01 and is that it replaces the support post with three poles assembled in shape. Pyramid As discussed above, said first claim has novelty and inventive activity and therefore it can be affirmed that the invention according to claim 2 also presents novelty (Law 11/1986, Art.6.1.) And inventive activity Law 11/1986 , Art.8.1.). Since claim 2 has novelty and inventive activity, the dependent claim thereof, that is, claims 4, also presents novelty (Law 11/1986, Art.6.1.) And inventive activity Law 11/1986, Art.8.1.) .
    State of the Art Report Page 4/4
ES201090049A 2008-02-22 2008-12-27 Energy generation device from solar heat. Expired - Fee Related ES2383786B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2008041941A JP4463308B2 (en) 2008-02-22 2008-02-22 Hybrid solar power generator
JP2008-041941 2008-02-22
PCT/JP2008/073869 WO2009104347A1 (en) 2008-02-22 2008-12-27 Hybrid solar heat power generation device

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ES2383786A1 true ES2383786A1 (en) 2012-06-26
ES2383786B2 ES2383786B2 (en) 2012-12-18

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JP (1) JP4463308B2 (en)
CN (1) CN101946133B (en)
AU (1) AU2008351048B2 (en)
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WO (1) WO2009104347A1 (en)

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AU2008351048A1 (en) 2009-08-27
ES2383786B2 (en) 2012-12-18
WO2009104347A1 (en) 2009-08-27
US20100319678A1 (en) 2010-12-23
JP4463308B2 (en) 2010-05-19
JP2009198120A (en) 2009-09-03
CN101946133B (en) 2012-10-10
CN101946133A (en) 2011-01-12

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