JP2013105927A - Power generating facility utilizing solar energy and operational method thereof - Google Patents

Abstract

An object of the present invention is to perform stable power generation at low cost using solar energy.
A concentrating solar power generation apparatus A having a solar receiver 1 on which solar rays are collected by a condensing device and a circulation channel 5 for circulating a heat medium are condensed by the concentrating device. A solar heat receiver 2 that heats the heat medium with sunlight, a heat storage device 3 that stores heat or dissipates heat by passing through the heat medium, and a heat exchanger 4 that generates steam by heat exchange between the heat medium and water are arranged. In addition, it has a concentrating solar thermal power generation device B provided with a steam turbine generator 6 that generates electric power using steam generated by the heat exchanger 4, and the circulation flow path 5 of the concentrating solar thermal power generation device B includes solar heat. The circulation system x for circulating the heat medium between the receiver 2 and the heat storage device 3 and the circulation system y for circulating the heat medium between the heat storage device 3 and the heat exchanger 4 can be formed to be switchable.
[Selection] Figure 1

Description

  TECHNICAL FIELD The present invention relates generally to power generation technology using solar energy, and more specifically, to a power generation facility capable of performing stable power generation at low cost by combining concentrated solar power generation and concentrated solar power generation. It relates to the driving method.

2. Description of the Related Art Conventionally, concentrating solar power generation and concentrating solar power generation as described below are known as techniques for generating power using concentrated sunlight.
(1) Concentrating solar power generation technology Conventional solar power generation has received direct sunlight from a solar panel and has generated power with a power generation efficiency of about 10 to 13%. On the other hand, concentrating solar power generation irradiates a high-efficiency solar cell such as a multi-junction type with solar rays collected by an optical system such as a heliostat to generate higher-efficiency power generation. .

The applicant announced a new tower concentrating solar power generation system in August 2011 (JFE Engineering / News Release 2011 / Internet <URL: http://www.jfe-eng.co.jp/release/ news11 / news_e11021.html>). In this power generation system, a solar receiver (solar cell module) equipped with a multi-junction solar cell having a secondary condensing function is installed at the top of the solar tower, and solar rays are condensed on the solar receiver by a heliostat. High-efficiency power generation is performed with multi-junction solar cells. The power generation efficiency of this power generation system is up to 26%, which is twice that of conventional solar power generation. The solar cell module is provided with a cooling mechanism, and cools the multi-junction solar cell to a certain temperature or less by circulating a refrigerant such as water during power generation.
In this power generation system, power can be generated only during the daytime when sunlight can be obtained, but if this system is combined with a storage battery, power is generated and stored in solar cells in the daytime, and power is supplied from the storage battery at night. By doing so, it is possible to supply power continuously day and night.

(2) Concentrating solar thermal power generation technology As a conventional solar thermal power generation system, for example, the one shown in Patent Document 1 is known. In this solar thermal power generation system, as shown in FIG. 5, the sunlight 33 is reflected by the heliostat group 30, condensed on the receiver 31 installed on the upper part of the condensing tower 32, and circulated to the receiver 31. Is vaporized by heating. This steam is sent to the turbine 34 to drive the generator to obtain electric power. The steam exiting the turbine 34 is cooled and condensed by the condenser 35, and the condensed fluid is sent to the receiver 31 again by the circulation pump. In this system, power generation is possible only during the daytime when sunlight is available.

Another solar thermal power generation system is known as shown in Non-Patent Document 1. In this solar thermal power generation system, as shown in FIG. 6, sunlight is collected by the parabolic trough 21 during the daytime, and the molten salt is circulated and heated to recover heat. A part of the heated molten salt is stored in the two heat storage tanks 22. The remaining molten salt exchanges heat with water in the heat exchanger 23 to generate steam to drive the steam turbine and the generator 24 to generate electricity. The steam that has passed through the steam turbine is condensed by the condenser 25 and circulated to the heat exchanger 23 again. On the other hand, at night, high-temperature molten salt stored in the heat storage tank 22 is circulated through the heat exchanger 23 to generate steam, and power is generated in the same manner as described above. In this system, not only daytime hours when sunlight is obtained, but also nighttime power generation is possible using sensible heat of the stored molten salt.
In the solar thermal power generation system shown in FIG. 5 and FIG. 6, it is said that power generation efficiency of about 20% can be realized.
Moreover, when the case where the same electric energy (unit: kWh) is supplied from a storage battery and the case where it supplies from the tower type solar power generation device which has a heat storage device are compared, the latter is cheaper.

International Publication No. 2009/105689

`` The parabolic trough power plants Andasol 1 to 3 '', Solar Millennium AG, 2008, p.12

Since power demand exists day and night, a problem with power generation systems that use solar energy is how to supply power during times when sunlight cannot be obtained.
In the concentrating solar power generation system as mentioned above, there is an advantage that high power generation efficiency can be obtained compared to conventional solar power generation, and when combined with a storage battery, power generation and storage are performed with solar cells in the daytime, Power can be supplied continuously from day to night by supplying power from the storage battery at night, but a large-capacity storage battery is extremely expensive and cannot be supplied at low cost.

On the other hand, concentrated solar power generation has a problem that power generation efficiency in the daytime period is lower than that of concentrated solar power generation. Moreover, in the concentrating solar thermal power generation system as shown in FIG. 6, since the energy collected in the daytime is distributed to power generation and heat storage, it is necessary to increase the capacity of the concentrating device more than twice. There is a problem that the equipment cost increases.
Accordingly, an object of the present invention is to provide a power generation facility capable of performing inexpensive and stable power generation using solar energy and an operation method thereof.

The gist of the present invention for solving the above problems is as follows.
[1] A concentrating solar power generation device (A) having a solar receiver (1) in which solar cells are arranged on a light receiving surface that receives sunlight rays collected by a condensing device having a plurality of mirrors ), A solar heat receiver (2) that heats the heat medium with solar rays collected by a light collecting device having a plurality of mirror bodies in a circulation channel (5) that circulates the heat medium, and the passage of the heat medium And a heat storage device (3) that stores or radiates heat and a heat exchanger (4) that generates steam by heat exchange between the heat medium and water, and the steam generated by the heat exchanger (4) It has a concentrating solar thermal power generation device (B) equipped with a steam turbine generator (6) that generates electric power, and the circulation channel (5) of the concentrating solar thermal power generation device (B) is a solar thermal receiver (2 ) And the heat storage device (3), the circulation system (x) for circulating the heat medium, and the heat storage device (3 ) And the heat exchanger (4), a power generation facility using solar energy, wherein the circulation system (y) for circulating the heat medium can be switched.
[2] The power generation facility using solar energy according to [1], wherein the solar cells provided in the solar receiver (1) are multi-junction solar cells.

[3] In the power generation facility according to [1] or [2], the solar energy characterized by having a water-cooled cooling unit (12) on the back surface of the solar cell provided in the solar receiver (1). Power generation equipment.
[4] In the power generation facility according to [3], the concentrating solar power generation device (B) is configured to circulate steam and water between the heat exchanger (4) and the steam turbine generator (6). (7) is provided, and a condenser (8) for condensing steam exiting the steam turbine generator (6) and water produced by the condenser (8) are stored in the circulation channel (7). A water tank (9) for supplying this to the heat exchanger (4) is provided, and the concentrating solar power generation device (A) supplies cooling water to the cooling unit (12) of the solar receiver (1). A cooling water flow path (10) for supply is provided, and each end of the cooling water flow path (10) is a flow path portion of the circulation flow path (7) between the water tank (9) and the heat exchanger (4). And a circulation channel (7) and a cooling water channel connected to the circulation channel (7) between the condenser (8) and the water tank (9), respectively. 10) is a circulation system (z) for circulating steam and water among the heat exchanger (4), the steam turbine generator (6) and the water tank (9), a cooling part (12) and a water tank (9). A power generation facility using solar energy characterized in that the circulation system (w) for circulating water between them can be switched.

[5] In the power generation facility according to any one of [1] to [4], the circulation channel (5) includes two channels (50) connected to one heat medium inlet / outlet of the heat storage device (3). There are two branch channels (500), (501), of which the branch channel (500) is connected to one heat medium inlet / outlet of the solar receiver (2), and the branch channel (501) is a heat exchanger ( The flow path (51) connected to one heat medium inlet / outlet of 4) and connected to the other heat medium inlet / outlet of the heat storage device (3) has two branch flow paths (510) and (511). Of these, the branch channel (510) is connected to the other heat medium inlet / outlet of the solar receiver (2), and the branch channel (511) is connected to the other heat medium inlet / outlet of the heat exchanger (4). (500), (501), (510), (511) are each provided with an on-off valve (13). Then, a circulation system that circulates the heat medium between the solar receiver (2) and the heat storage device (3) through the branch flow path (500) and the branch flow path (510) by opening and closing these on-off valves (13). (X) and the circulation system (y) for circulating the heat medium between the heat storage device (3) and the heat exchanger (4) via the branch channel (501) and the branch channel (511) can be switched. A power generation facility using solar energy, characterized by being formed into

[6] In the power generation facility according to any one of [1] to [5] above, solar power generation using solar energy, wherein the solar receiver (1) and the solar heat receiver (2) are installed in one solar tower Facility.
[7] A method for operating the power generation facility according to any one of [1] to [6] above, wherein power is generated by the concentrating solar power generation device (A) during a time zone in which the intensity of solar rays is equal to or higher than a predetermined level. In the concentrating solar power generation device (B), the heat medium is circulated in the circulation system (x) to store heat in the heat storage device (3) with the heat medium, so that the intensity of the sun rays is at a predetermined level. In the time zone less than, in the concentrating solar power generation device (B), the heat medium is circulated in the circulation system (y) to radiate the heat stored in the heat storage device (3) to the heat medium, A solar power generation device characterized in that steam is generated by heat exchange between a heat medium and water in a heat exchanger (4), and the steam turbine generator (6) is driven by the steam to generate power. how to drive.

  According to the present invention, concentrated solar power generation with high power generation efficiency is performed in a time zone in which the intensity of solar rays is equal to or higher than a predetermined level (mainly a daytime time zone in which sunlight is obtained). It is different that power generation is performed using a heat storage device of a concentrating solar thermal power generation system in which the unit price of generated power is lower than that of a storage battery in a time zone less than a predetermined level (mainly in the evening or night when sunlight cannot be obtained). Since power is generated by a combination of power generation methods, stable power generation can be performed at low cost for a long time.

Whole flow figure showing one embodiment of power generation equipment of the present invention The perspective view which shows one Embodiment of the solar power generation module with which the concentrating solar power generation device of the power generation facility of FIG. Explanatory drawing which shows the implementation status of the operation method of the power generation equipment of FIG. Explanatory drawing which shows the implementation status of the operation method of the power generation equipment of FIG. Explanatory drawing showing an example of a conventional concentrating solar power generation system Explanatory drawing showing another example of a conventional concentrating solar power generation system

FIG. 1 is an overall flowchart showing one embodiment of the power generation facility of the present invention.
In the figure, S is a condensing device having a plurality of mirrors, and T is a solar tower in which a solar receiver 1 and a solar heat receiver 2 described later are installed.
The said condensing device S reflects a sunlight ray in a some mirror body, and makes it condense to a receiver (The sunlight receiver 1 and the solar heat receiver 2 which are mentioned later), In this embodiment, a mirror body and a sunlight ray are collected. It is composed of a heliostat combined with a mirror angle control device for guiding it toward the receiver. Usually, several hundred to tens of thousands of heliostats are installed, and the mirror angle is controlled so that the sunlight rays always gather at the receiver even if the position of the sun changes.
Each of the light collecting devices S (such as a heliostat) is controlled so as to reflect sunlight toward one of the solar receiver 1 and the solar heat receiver 2 described later.
The solar tower T is usually composed of a steel frame or the like. Although the height is arbitrary, it is about 50m-100m normally, and height is designed appropriately by the quantity of the light which a receiver (solar light receiver 1, solar heat receiver 2) receives. A plurality of solar towers T may be installed.

The power generation facility of the present invention includes a concentrating solar power generation device A and a concentrating solar power generation device B.
Among these, the concentrating solar power generation device A has a solar receiver 1 that receives the sunlight rays collected by the condensing device S. The solar receiver 1 has solar cells arranged on the light receiving surface thereof and is installed on the top of the solar tower T. The solar receiver 1 receives the sunlight rays collected by the condensing device S at the light receiving surface, and generates power in the solar battery cell. The area of the light receiving surface of one solar receiver 1 is arbitrary and varies depending on the power generation capacity, but is usually about several tens of square meters to one hundred square meters.

Any solar cell can be used as the solar cell, but a multi-junction solar cell is preferable in order to increase power generation efficiency. This multi-junction solar cell is a stack of a plurality of solar cells having different utilization wavelengths, and is characterized in that solar energy can be used in a wide wavelength range and high conversion efficiency can be obtained.
Moreover, since the photovoltaic cell of the solar receiver 1 becomes high temperature, it is preferable to forcibly cool it. For this reason, it is preferable to equip the back surface of the photovoltaic cell with a water-cooled cooling unit 12. As will be described later, cooling water is supplied to the cooling unit 12 through the cooling water flow path 10 to cool (remove heat) the solar cells.

FIG. 2 shows an embodiment of the solar power generation module 11 provided on the light receiving surface of the solar receiver 1.
The solar power generation module 11 includes a solar cell assembly 21 in which a plurality of solar cells 210 (for example, multi-junction solar cells) are aggregated, and a prism-type light collector 22 (glass or the like) provided on the front surface thereof. And a cooling unit 12 provided on the back surface of the solar battery cell assembly 21. This solar power generation module 11 has a secondary condensing function by the condensing body 22, and the solar rays condensed (primary condensing) on the condensing body 22 by the condensing device S are converted into the condensing body. 22, the individual solar cells 210 constituting the solar cell assembly 21 can be condensed at a high magnification.
A plurality of cooling water passages (not shown) are formed inside the cooling section 12, and a cooling water passage 10 described later is connected to the cooling water passage so that the cooling water can pass therethrough.

The concentrating solar power generation apparatus B stores heat in the circulation channel 5 that circulates the heat medium, the solar heat receiver 2 that heats the heat medium with solar rays condensed by the condensing apparatus S, and the passage of the heat medium. Alternatively, a heat storage device 3 that dissipates heat and a heat exchanger 4 that generates steam by heat exchange between the heat medium and water, and steam turbine power generation that generates power using the steam generated by the heat exchanger 4 A machine 6 is provided. The circulation channel 5 is constituted by a heated pipe.
Here, the kind of the heat medium (fluid) is arbitrary, and may be a liquid such as water or a molten salt, or may be a gas such as air.

  The solar heat receiver 2 is installed on the solar tower T together with the solar receiver 1. On the light receiving surface of the solar receiver 2, for example, heat transfer tubes such as boiler tubes are densely arranged and heated by receiving the concentrated sunlight. A heat medium flows in the heat transfer tube, and the heat medium is heated by heat transfer from the heat transfer tube (although depending on the type of the heat medium, it is usually heated to about 650 ° C.). The area of the light receiving surface of one solar receiver 2 is arbitrary and varies depending on the power generation capacity, but is usually about several tens of square meters to one hundred square meters.

  The heat storage device 3 is a device in which the heat of the heat medium is stored or the heat stored in the device is radiated to the heat medium according to the temperature of the passing heat medium. It is composed of a pressure-resistant container (for example, a pressure-resistant container with an inner wall insulation covered with a steel outer shell) laminated with a heat storage body with a large number of holes through which a liquid such as a molten salt or a gas such as air passes. The In the case of such a heat storage device, when the high-temperature heat medium passes through the heat storage body in the device, the heat of the heat medium is stored in the heat storage body (heat storage), while the stored high-temperature heat storage body is stored. When the low-temperature heat medium passes, the heat medium is heated by the heat of the heat storage body (radiation to the heat storage body). In the present embodiment, one heat storage device 3 is provided, but two or more heat storage devices 3 may be provided in series. The size of each heat storage device 3 is arbitrary, but usually the diameter is about several meters to ten meters and the height is about several tens meters to hundred meters. Although it depends on the type of the heat medium, the heat medium temperature on the entry side of the heat storage device 3 is usually about 650 ° C.

The heat exchanger 4 exchanges heat between the heat medium passing through the inside of the vessel and water, and generates steam from the water. The heat exchanger 4 has a necessary amount of water through a circulation channel 7 described below. Is supplied. Depending on the type of heat medium, the high temperature heat medium normally enters the heat exchanger 4 at 650 to 550 ° C. and exits the heat exchanger 4 at about 150 ° C.
Between the steam turbine generator 6 and the heat exchanger 4, water and steam are circulated by the circulation flow path 7. In this circulation flow path 7, an air-cooled or water-cooled condenser 8 that condenses the steam that has exited the steam turbine generator 6 and water generated by the condenser 8 are stored, and this is stored in the heat exchanger 4. A water tank 9 to be supplied and a circulation pump 14 are provided in this order in the flow direction of water and steam. The circulation pump 14 can adjust the amount of water supplied to the heat exchanger 4 by a control device (not shown).

The circulation flow path 5 of the concentrating solar thermal power generation apparatus B includes a circulation system x that circulates the heat medium between the solar receiver 2 and the heat storage device 3, and circulation that circulates the heat medium between the heat storage device 3 and the heat exchanger 4. The system y can be formed to be switchable (selectively switchable). In order to make this possible, the circulation flow path 5 has a piping mechanism having a plurality of on-off valves and a circulation pump (or fan).
That is, of the circulation flow path 5, the flow path 50 connected to one heat medium inlet / outlet (heat medium inlet in the present embodiment) of the heat storage device 3 has two branch flow paths 500 and 501, of which the branch is branched. The flow path 500 is connected to one heat medium inlet / outlet (in this embodiment, a heat medium outlet) of the solar receiver 2, and the branch flow path 501 is one heat medium inlet / outlet (in the present embodiment, heat medium inlet) of the heat exchanger 4. It is connected to the.

  The flow path 51 connected to the other heat medium inlet / outlet (heat medium outlet in the present embodiment) of the heat storage device 3 has two branch paths 510 and 511, and the branch path 510 is the solar heat receiver 2. The other heat medium inlet / outlet (heat medium inlet in this embodiment) is connected, and the branch flow path 511 is connected to the other heat medium inlet / outlet (heat medium outlet in this embodiment) of the heat exchanger 4. Each branch flow channel 500, 501, 510, 511 is provided with on-off valves 13a, 13b, 13c, 13d, respectively. And by the opening / closing operation | movement of these on-off valves 13a-13d, the circulation system x which circulates a thermal medium between the solar receiver 2 and the thermal storage apparatus 3 via the branch flow path 500 and the branch flow path 510, and the branch flow path 501 The circulation system y that circulates the heat medium between the heat storage device 3 and the heat exchanger 4 via the branch flow path 511 can be switched (selectively switched).

  The circulation system x and the circulation system y are provided with circulation pumps 20a and 20b for circulating the heat medium, respectively. The position where the circulation pumps 20a and 20b are installed is arbitrary, but in this embodiment, the circulation pump 20a is provided in the branch flow path 510 (the flow path on the heat medium outlet side of the heat storage device 3) constituting the circulation system x. The circulation pump 20b is provided in each of the branch flow paths 511 (flow path on the heat medium outlet side of the heat exchanger 4) constituting the circulation system y. When the heat medium is a gas, a circulation fan is provided in place of the circulation pumps 20a and 20b.

The concentrating solar power generation apparatus A includes a cooling water channel 10 for supplying cooling water to the cooling unit 12 of the solar receiver 1, and each end of the cooling water channel 10 (that is, the solar receiver 1 of the solar receiver 1). The end portions of the cooling water inlet side channel 100 and the cooling water outlet side channel 101) are the channel portion of the circulation channel 7 between the water tank 9 and the heat exchanger 4, and the condenser 8-water tank. 9 are respectively connected to the flow path portions of the circulation flow path 7. The circulation channel 7 and the cooling water channel 10 connected to the circulation channel 7 are a circulation system z that circulates steam and water among the heat exchanger 4, the steam turbine generator 6, and the water tank 9, a cooling unit 12, and water. A circulation system w for circulating water (cooling water) between the tanks 9 can be formed to be switchable (selectively switchable). In order to make this possible, a circulation pump 14 is provided in the circulation channel 7 between the water tank 9 and the connection portion of the cooling water channel 10 (channel 100), and the cooling water channel 10 (channel 100). ) Is connected to the circulation channel 7 between the connection portion and the heat exchanger 4, and the on-off valve is connected to the circulation channel 7 between the condenser 8 and the cooling water channel 10 (channel 101). On-off valves 15c and 15d are provided in the flow paths 100 and 101 constituting the cooling water flow path 10 respectively. Further, the circulation system z and the circulation system w can be switched (selectively switched) by opening / closing the opening / closing valves 15a to 15d.
In the other drawings, 16 is a solarimeter that can measure the solar radiation intensity, 17 is a power output wiring of the concentrating solar power generation apparatus A, and 18 is a power output wiring of the concentrating solar power generation apparatus B. Yes, the power output is connected to the external power system 19 via a control device (not shown).

Next, an operation method of the power generation facility of the present invention will be described based on FIGS. 3 and 4 taking the embodiment of FIG. 1 as an example. 3 and 4, the open / close valves 13a to 13d and 15a to 15d indicate that the white ones are in an open state and the ones that are painted black are in a closed state.
In a time zone in which the intensity of the solar rays is equal to or higher than a predetermined level (mainly a daytime time zone in which sunlight is obtained), as shown in FIG. In the solar thermal power generation apparatus B, heat storage is performed on the heat storage device 3 by the heat medium by circulating the heat medium in the circulation system x. Therefore, the on-off valves 13 a and 13 c of the circulation channel 5 are opened, the on-off valves 13 b and 13 d are closed, and the circulation system x is formed in the circulation channel 5. Further, the cooling water is circulated in the circulation system w, and the solar receiver 1 (solar battery cell) is cooled by the cooling unit 12. For this reason, the on-off valves 15 c and 15 d of the cooling water passage 10 are opened, the on-off valves 15 a and 15 b of the circulation passage 7 are closed, and the circulation system w is formed in the circulation passage 7 and the cooling water passage 10. On the other hand, in this time zone, steam generation in the heat exchanger 4 of the concentrating solar power generation apparatus B and power generation by the steam turbine generator 6 are not performed.

For example, about half of the condensing device S (such as a heliostat) is condensed toward the solar receiver 1, and the remaining half is condensed toward the solar receiver 2. At this time, the condensing magnification (total heliostat mirror area / receiver light receiving area) on the receiver light receiving surface is about 500 to 1000 times.
In the concentrating solar power generation apparatus A, in the circulation system w, cooling water circulates between the cooling unit 12 of the solar receiver 1 (solar power generation module 11) and the water tank 9 by the circulation pump 14, and the solar receiver One solar cell is cooled. The electric power generated by the solar receiver 1 is supplied to the external power system 19 via the wiring 18. On the other hand, in the concentrating solar thermal power generation apparatus B, in the circulation system x, the heat medium is circulated between the solar receiver 2 and the heat storage device 3 by the circulation pump 20a, and the heat medium is heated by the solar heat in the solar receiver 2. The heat medium heated by the solar heat receiver 2 stores heat in the heat storage device 3 by, for example, heating a heat storage body inside the device in the process of passing through the heat storage device 3.

  Next, power generation by the concentrating solar power generation apparatus A cannot be performed in a time zone in which the intensity of the sunbeam is less than a predetermined level (mainly in the evening or night time when sunlight cannot be obtained). In the concentrating solar power generation device B, the heat medium is circulated in the circulation system y to radiate the heat stored in the heat storage device 3 to the heat medium, and in the heat exchanger 4 Steam is generated by heat exchange with water, and the steam turbine generator 6 is driven by the steam to generate power. For this reason, the on-off valves 13b and 13d of the circulation channel 5 are opened, the on-off valves 13a and 13c are closed, and the circulation system y is formed in the circulation channel 5. That is, the circulation system of the heat medium formed in the circulation channel 5 is switched from the circulation system x formed in FIG. 3 to the circulation system y. Further, in order to circulate water and steam between the heat exchanger 4 and the steam turbine generator 6, the on-off valves 15a and 15b of the circulation channel 7 are opened, and the on-off valves 15c and 15d of the cooling water channel 10 are closed to circulate the system. z is formed. That is, the circulatory system w formed in FIG. 3 is switched to the circulatory system z.

In the concentrating solar thermal power generator B, in the circulation system y, the heat medium is circulated between the heat storage device 3 and the heat exchanger 4 by the circulation pump 20b, and in the circulation system z, the heat exchanger 4 and the steam turbine generator 6 are circulated. Circulate water and steam between them.
In the circulation system y, when the heat medium passes through the heat storage device 3, the heat medium is heated by the heat stored in the heat storage device 3, and the heated heat medium exchanges heat with water in the heat exchanger 4 to generate steam. Is generated. The steam generated by the heat exchanger 4 is sent to the steam turbine generator 6 for power generation. The steam exiting the steam turbine generator 6 is liquefied by the condenser 8 and returned to the water tank 9. The electric power generated by the steam turbine generator 6 is supplied to the external power system 19 via the wiring 18.

In addition, the irradiation intensity of sunlight is measured by the sunshine meter 16, and the operation mode shown in FIG. 3 and the operation mode shown in FIG. 4 are switched by a control device (not shown) based on the measurement result.
As described above, in the present invention, using a facility configuration in which the concentrating solar power generation device A and the concentrating solar power generation device B are combined, and using them properly according to time zones, the solar energy is utilized, which is high. Power generation efficiency and stable power generation can be performed at low cost.

A Concentration type solar power generation device B Concentration type solar thermal power generation device 1 Solar receiver 2 Solar heat receiver 3 Thermal storage device 4 Heat exchanger 5 Circulation channel 6 Steam turbine generator 7 Circulation channel 8 Condenser 9 Water tank 10 Cooling Water flow path 11 Solar power generation module 12 Cooling unit 13a, 13b, 13c, 13d On-off valve 14 Circulating pump 15a, 15b, 15c, 15d On-off valve 16 Solar radiation meter 17, 18 Wiring 19 External power system 20a, 20b, Circulation pump 21 Solar cell assembly 22 Condenser 50, 51 Channel 100, 101 Channel 210 Solar cell 500, 501, 510, 511 Branch channel x, y Circulation system z, w Circulation system

Claims (7)

A concentrating solar power generation device (A) having a solar receiver (1) in which solar cells are arranged on a light receiving surface that receives solar rays collected by a condensing device including a plurality of mirror bodies;
A solar heat receiver (2) that heats the heat medium with solar rays collected by a light collecting device having a plurality of mirror bodies in the circulation channel (5) that circulates the heat medium; A heat storage device (3) that dissipates heat and a heat exchanger (4) that generates steam by heat exchange between the heat medium and water are disposed, and power is generated using the steam generated by the heat exchanger (4). A concentrating solar power generator (B) equipped with a steam turbine generator (6) for performing
The circulation flow path (5) of the concentrating solar thermal power generation device (B) includes a circulation system (x) for circulating a heat medium between the solar heat receiver (2) and the heat storage device (3), a heat storage device (3), and heat. A power generation facility using solar energy, characterized in that the circulation system (y) for circulating the heat medium between the exchangers (4) can be switched.   The solar cell provided in the solar receiver (1) is a multi-junction solar cell, and the power generation facility using solar energy according to claim 1.   The power generation facility using solar energy according to claim 1 or 2, further comprising a water-cooled cooling section (12) on a back surface of the solar battery cell provided in the solar receiver (1). The concentrating solar thermal power generation device (B) includes a circulation channel (7) for circulating steam and water between the heat exchanger (4) and the steam turbine generator (6), and the circulation channel (7 ), The condenser (8) for condensing the steam exiting the steam turbine generator (6) and the water produced in the condenser (8) are stored and supplied to the heat exchanger (4). Water tank (9) is provided,
The concentrating solar power generation device (A) includes a cooling water channel (10) for supplying cooling water to the cooling unit (12) of the solar receiver (1), and each of the cooling water channels (10) is provided. The end portions of the circulation channel (7) between the water tank (9) and the heat exchanger (4) and the circulation channel (7) between the condenser (8) and the water tank (9) Connected to the flow channel part,
A circulation channel (7) and a cooling water channel (10) connected to the circulation channel (10) circulate the steam and water among the heat exchanger (4), the steam turbine generator (6), and the water tank (9). The solar energy according to claim 3, characterized in that (z) and a circulation system (w) for circulating water between the cooling part (12) and the water tank (9) can be switched. Power generation equipment used. Of the circulation flow path (5), the flow path (50) connected to one heat medium inlet / outlet of the heat storage device (3) has two branch flow paths (500) and (501), of which the branch flow The channel (500) is connected to one heat medium inlet / outlet of the solar receiver (2), the branch channel (501) is connected to one heat medium inlet / outlet of the heat exchanger (4),
The flow path (51) connected to the other heat medium inlet / outlet of the heat storage device (3) has two branch flow paths (510) and (511), of which the branch flow path (510) is the solar heat receiver (2). ) Is connected to the other heat medium inlet / outlet, and the branch channel (511) is connected to the other heat medium inlet / outlet of the heat exchanger (4).
Each branch flow path (500), (501), (510), (511) is provided with an open / close valve (13), and the open / close valve (13) is operated to open and close the branch flow path (500). Via the circulation system (x) for circulating the heat medium between the solar receiver (2) and the heat storage device (3) via the branch channel (510), via the branch channel (501) and the branch channel (511) The circulation system (y) for circulating the heat medium between the heat storage device (3) and the heat exchanger (4) is formed to be switchable. Power generation facility using solar energy as described.   The solar power receiver (1) and the solar heat receiver (2) are installed in one solar tower, The power generation facility using solar energy according to any one of claims 1 to 5. A method for operating the power generation facility according to any one of claims 1 to 6,
In a time zone in which the intensity of solar rays is equal to or higher than a predetermined level, power is generated by the concentrating solar power generation device (A), and in the concentrating solar thermal power generation device (B), a heat medium is supplied by the circulation system (x). By circulating, heat storage to the heat storage device (3) by the heat medium,
In the time zone when the intensity of the sun rays is less than a predetermined level, the heat storage device (3) is circulated by circulating the heat medium in the circulation system (y) in the concentrating solar power generation device (B). A solar that radiates heat to the heat medium, generates steam by heat exchange between the heat medium and water in the heat exchanger (4), and drives the steam turbine generator (6) with the steam to generate electric power. A method of operating a power generator using energy.

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