JP5647315B2 - Solar thermal power plant and control method thereof - Google Patents

Solar thermal power plant and control method thereof Download PDF

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JP5647315B2
JP5647315B2 JP2013197869A JP2013197869A JP5647315B2 JP 5647315 B2 JP5647315 B2 JP 5647315B2 JP 2013197869 A JP2013197869 A JP 2013197869A JP 2013197869 A JP2013197869 A JP 2013197869A JP 5647315 B2 JP5647315 B2 JP 5647315B2
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heat
power generation
heat storage
solar thermal
energy
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JP2014088873A (en
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純直 友保
純直 友保
伸幸 筒井
伸幸 筒井
章次 酒井
章次 酒井
康光 佐藤
康光 佐藤
一明 江澤
一明 江澤
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三井造船株式会社
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    • 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
    • F28HEAT EXCHANGE IN GENERAL
    • F28DHEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D20/0034Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
    • F28D2020/0047Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
    • 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
    • Y02E10/44Heat exchange systems
    • 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
    • Y02E10/46Conversion of thermal power into mechanical power, e.g. Rankine, Stirling solar thermal engines
    • 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
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/14Thermal storage
    • Y02E60/142Sensible heat storage

Description

  The present invention relates to a solar thermal power plant having a plurality of heliostats that reflect sunlight, a heat receiving part that receives sunlight reflected by the heliostat, and a heat medium circuit that circulates the heat medium from the heat receiving part to a power generation device, and It relates to the control method.

  As a means for utilizing natural energy, development of a solar thermal power plant is underway (see, for example, Patent Document 1). FIG. 9 shows a schematic diagram of an example of a conventional solar power plant. The solar thermal power plant 1X includes a plurality of heliostats 2 configured by reflecting mirrors that reflect sunlight, a heat receiving unit (also referred to as a receiver) 3X that receives sunlight reflected by the heliostat 2, and a heat receiving unit 3X. It has a heat medium circuit 4X that circulates water vapor, which is a heat medium, and a power generation device 5X that generates power using the water vapor. In the case of a tower type solar thermal power plant, the heat receiving portion 3X is installed on the top of the tower 9X. The power generation device 5 </ b> X includes a steam turbine 11 and a generator 12 connected to the steam turbine 11. Furthermore, the heat medium circuit 4X may include a heat storage tank 6X that directly stores water vapor. With the above configuration, electricity can be extracted from solar heat.

  Next, the operation of the solar thermal power plant 1X will be described. The solar thermal power generation plant 1 </ b> X has a configuration in which sunlight is condensed on the heat receiving unit 3 </ b> X by the heliostat 2, the heating medium (water) circulating through the heat receiving unit 3 </ b> X is heated, steam is generated, and power is generated by the steam turbine 11. doing. In addition, in some cases, a part of water vapor used for power generation is stored in the heat storage tank 6X, and at night when solar heat cannot be obtained, the water vapor in the heat storage tank 6X is supplied to the power generation device 5X to control power generation. is there.

  In FIG. 10, the schematic of the different example of the conventional solar thermal power plant is shown. In this solar thermal power plant 1Y, instead of the above-described heating medium circuit 4X (see FIG. 9), a heating medium circuit 4Y that circulates a molten salt (such as sodium nitrate) as a heating medium and a heating medium circuit 4Z that circulates water vapor. have. The two heat medium circuits 4Y and 4Z are configured to transmit heat energy via the heat exchanger 7Y. Further, the heat medium circuit 4Y for circulating the molten salt may have a heat storage tank 6Y for directly storing the molten salt. This solar thermal power plant 1Y has a configuration in which the molten salt circulating in the heat receiving section 3X is heated, steam is generated by the heat exchanger 7Y, and power is generated by the steam turbine 11.

  The solar thermal power generation plants 1X and 1Y described above have a property that, when the heat storage tanks 6X and 6Y are not used, power generation is possible only when sunlight such as daytime can be obtained. FIG. 11 shows the relationship between the amount of change in energy and time in a solar thermal power plant. The graph of FIG. 11 shows the relationship between the amount of solar heat energy supplied from the sun to the heat receiving unit 3X and the amount of energy output as electricity. In addition, the vertical axis | shaft of this graph shows energy amount, and the horizontal axis has shown time.

E IN shown in the graph indicates a change in the amount of input energy of sunlight irradiated to the heat receiving unit 3X. The input energy E IN starts to rise from sunrise (around 7 o'clock), peaks at noon (around 12 o'clock), and falls toward sunset (around 18 o'clock). On the other hand, E OUT indicates the amount of output energy generated and output by the solar thermal power plants 1X and 1Y. Solar thermal power plant 1X, 1Y of the steam turbine 11, as installed capacity, is installed to have a predetermined nominal output energy E S below the input energy E IN. This in determining the capacity of the steam turbine 11, when selected according to the maximum output of the input energy E IN, power generator 5X is because the electric power can be generated only when the input energy is the maximum output. That is, if the input energy E IN is not a maximum value, the power generation device 5X is because no longer emitted rated output, the efficiency of the equipment is deteriorated. In general, as shown in FIG. 11, the rated output energy E S is set to about 50% of the maximum value of the input energy E IN. This configuration, exceeds the input energy E IN rated output energy E S from sun, the time power generation becomes possible is increased by the power generation device 5X. In addition, the range shown with an oblique line is the total amount of the electrical energy taken out from solar thermal energy.

Conventionally, the input energy E IN of the range of time of sunrise or immediately after sunset just before below the rated output energy E S did not contribute as power generation energy. This is because sufficient energy for rotating the steam turbine 11 cannot be obtained. That is, the energy in the range of the first region P1 and the second region P2 shown in FIG. 11 has been discarded.

The input energy E IN of the range of time periods before and after noon exceeding the rated output energy E S, in order to exceed the power generation capacity of the steam turbine 11, is tilted a portion of the heliostat 2, reflected light to the heat receiving portion 3X It was controlled not to condense. That is, the energy in the range of the third region P3 shown in FIG. 11 has been discarded.

As described above, the solar thermal power plant 1X can generate power only when sufficient input energy E IN of solar light can be obtained, for example, from 8:00 to 17:00. That is, the general solar thermal power plants 1X and 1Y are difficult to obtain a rated electrical output, and thus are installed in another power plant such as a gas turbine power plant, and are used supplementarily as a heat supply source. There were many things. By installing these solar thermal power plants 1X and 1Y, it has been possible to suppress fuel consumption in gas turbine power plants and the like.

  However, the solar thermal power plant described above has several problems. First, a solar thermal power plant has a problem that it is difficult to use it independently as a main power plant. This is because a conventional solar thermal power plant cannot generate power at night or in the rain when sufficient sunlight cannot be obtained, and stable power supply becomes difficult.

  Secondly, when a heat storage tank or the like is used to generate power at night or in the rain, there is a problem that the construction cost of the solar thermal power plant becomes enormous. For example, as shown in FIG. 9, when a heat storage tank 6X that directly stores water vapor is employed, the heat storage tank 6X is expensive. Specifically, the heat storage tank 6X is required to have a structure that satisfies stable storage of high-pressure (0.5 to 20 MPa) water vapor and suppression of heat radiation of the water vapor. Moreover, as shown in FIG. 10, when the heat storage tank 6Y which directly accumulate | stores molten salt is employ | adopted, the heat-medium circuit 4Y became high cost. Specifically, auxiliary heating equipment for heating the molten salt in the heat medium circuit 4Y was necessary. This is because the molten salt has a property of easily solidifying due to a decrease in temperature and closing the heating medium circuit 4Y.

Thirdly, the conventional solar thermal power plant has a problem that it is difficult to improve the power generation efficiency. This is because, as shown in the first to third regions P1, P2, P3 in FIG. 11, of the input energy E IN of sunlight, because portions that do not contribute to power generation, for example, is nearly 50%. Therefore, even if the light collection efficiency of the heliostat 2 and the power generation efficiency of the steam turbine 11 are improved, it is difficult to improve the power generation efficiency of the entire solar thermal power plant.

Japanese Patent No. 4777452

  The present invention has been made in view of the above-mentioned problems, and its purpose is to reduce the construction cost in a solar thermal power plant, to generate power even at night or in the rain, and improve power generation efficiency. An object is to provide a solar thermal power generation plant and a control method thereof.

  In order to achieve the above object, a solar thermal power generation plant according to the present invention includes a plurality of heliostats that reflect sunlight, a heat receiving part that receives sunlight reflected by the heliostat, and a power generation device from the heat receiving part. In the solar thermal power plant having a heat medium circuit that circulates the heat medium, the solar thermal power plant has an independent power generation heat medium circuit and a heat storage heat medium circuit, and the power generation heat medium circuit, A heat generating heat receiving section configured to circulate the heat generating heat medium, and a power generation device that converts heat energy of the power generating heat medium into electricity, and the heat storage heat medium circuit includes heat for heat storage. A heat storage heat receiving portion configured to circulate the medium, and at least one heat storage tank that supplies the heat storage heat medium and transfers heat is provided.

  With this configuration, the solar thermal power plant can be used independently as a main power plant. This is because power can be stably generated using the thermal energy of the heat storage tank even in the case of nighttime, rainy weather, just after sunrise or just before sunset, when sufficient sunlight cannot be obtained.

  Moreover, the power generation efficiency of the solar thermal power plant can be dramatically improved. This is because the input energy of sunlight, which has not conventionally contributed to power generation, can be stored in a heat storage tank and used together as necessary.

  In the above solar thermal power plant, the heat storage heat medium circuit is formed on the upstream side of the heat exchanger that moves the heat energy of the heat storage heat medium to the heat generation medium, and the heat storage tank and the heat exchanger. And a low temperature side circuit formed on the downstream side of the heat storage tank and the heat exchanger, and the low temperature side circuit is provided on the downstream side of the heat storage tank and the heat exchanger, respectively. It has a flow control valve.

  With this configuration, the construction cost of the solar thermal power plant can be suppressed. This is because the flow rate of the heat storage heat medium passing through the heat storage tank can be controlled by the flow rate control valve. If this flow control valve is not installed, a large and high-cost switching valve or flow control valve for controlling the flow of the heat storage heat medium must be installed in the high-temperature circuit. The high temperature side valve is expensive due to severe requirements such as heat resistance.

  In the solar thermal power plant, the low-temperature circuit has a three-way valve installed on the downstream side of the heat storage tank, and the three-way valve flows through the low-temperature circuit by switching control. The medium is configured to flow from the downstream side to the upstream side of the heat storage tank.

  With this configuration, the construction cost of the solar thermal power plant can be suppressed. This is because the three-way valve can easily extract heat energy from the heat storage tank and transfer the heat energy to the heat exchanger via the high temperature side circuit. Moreover, the structure which installs a three-way valve for every heat storage tank can perform control which selects arbitrarily the heat storage tank which performs heat storage, and the heat storage tank which performs heat dissipation.

  In the above solar thermal power plant, the heat storage heat medium is air. With this configuration, the construction cost of the solar thermal power plant can be suppressed. This is because the internal pressure of the heat storage heat medium circuit and the heat storage tank can be set to a low pressure (about atmospheric pressure). When the power generation device is a steam turbine, it is desirable that the heat generating medium be steam. This is because, with this configuration, the steam generated by the heat of the heat receiving portion for power generation and the heat storage tank can be directly supplied to the power generation device, and the thermal efficiency can be maintained.

  In the above solar thermal power plant, the solar thermal power plant has a control device, and the control device transfers the heat storage tank from the heat storage tank via the heat storage heat medium and the heat exchanger. It has the structure which performs the thermal storage electric power generation control which transmits thermal energy and generates electric power with the said electric power generating apparatus using the said thermal energy.

  With this configuration, the construction cost of the solar thermal power plant can be suppressed. This is because the power generation device connected to the heat medium circuit for power generation can be used when generating power with the heat energy of the heat storage tank.

  Moreover, the solar thermal power generation plant can generate power stably even at night, when it is rainy, when it is rainy, just after sunrise, or just before sunset. This is because power generation can be performed using the thermal energy of the heat storage tank by the heat storage power generation control.

  In the above solar thermal power plant, the solar thermal power plant has a control device, and the control device performs solar power generation control for concentrating sunlight on the power receiving unit for power generation with at least some of the heliostats. It has the structure which performs the thermal storage control which condenses sunlight to the said heat receiving part for thermal storage with the structure to perform, and at least one part of said heliostat.

  With this configuration, the power generation efficiency of the solar thermal power plant can be improved. This is because, by controlling the heliostat, necessary and sufficient heat energy is sent to the heat receiving portion for power generation, and surplus energy can be stored in the heat storage tank via the heat receiving portion for heat storage. In other words, energy that has been discarded in the past can be used.

  In order to achieve the above object, a solar power plant control method according to the present invention includes a plurality of heliostats that reflect sunlight, a heat receiving unit that receives sunlight reflected by the heliostat, and the heat receiving unit. A solar heat power plant having a heat medium circuit for circulating a heat medium from the power generation device to the power generation device, wherein the solar heat power plant has an independent heat medium circuit for power generation and a heat medium circuit for heat storage, and the heat medium circuit for power generation However, it has a heat receiving portion for power generation configured to circulate the heat generating heat medium, and a power generation device that converts heat energy of the heat generating heat medium into electric power, and the heat storage heat medium circuit includes heat for heat storage. A heat storage heat receiving portion configured to circulate the medium, at least one heat storage tank for supplying and receiving heat by supplying the heat storage heat medium, and heat energy of the heat storage heat medium as the heat generating heat medium Have a heat exchanger to move to A method for controlling a solar thermal power plant, comprising: a solar thermal power generation step for performing control for concentrating sunlight on the heat receiving part for power generation with at least some of the heliostats; and at least some of the heliostats with sunlight A heat storage step for performing control for condensing light to the heat storage heat receiving unit, and transferring heat energy from the heat storage tank to the heat generating heat medium via the heat storage heat medium and the heat exchanger, and using the heat energy And a thermal storage power generation step for performing thermal storage power generation control for generating power with the power generation device. With this configuration, the same effects as described above can be obtained.

  In the control method for the solar thermal power generation plant, when the solar thermal power generation step is executed, the thermal storage power generation step is executed simultaneously so that at least one of the plurality of thermal storage tanks dissipates heat.

With this configuration, during the daytime solar power generation step, the amount of thermal energy that is input to the power receiving section for power generation due to the effect of clouds crossing over the solar power generation plant or the like can be increased or decreased for a short time. Even so, the power generation amount can be kept constant. This is because the heat energy radiated from the heat storage tank functions as a buffer and is supplied to the heat generating medium so as to compensate for the insufficient heat energy.

  According to the solar thermal power plant and the control method thereof according to the present invention, the solar thermal power plant and the control method thereof are capable of suppressing the construction cost, generating power even at night or in the rain, and improving the power generation efficiency. Can be provided.

It is the figure which showed the outline of the solar thermal power plant of embodiment which concerns on this invention. It is the figure which showed the outline of the solar thermal power plant of embodiment which concerns on this invention. It is the figure which showed the relationship between the variation | change_quantity of the energy in a solar thermal power plant, and time. It is the figure which showed the outline of the different control of the solar thermal power generation plant of embodiment which concerns on this invention. It is the figure which showed the outline of the different control of the solar thermal power generation plant of embodiment which concerns on this invention. It is the figure which showed the example from which the relationship of the variation | change_quantity of the energy in a solar thermal power plant and time differs. It is the figure which showed the outline of control of the heliostat in a solar thermal power plant. It is the figure which showed the outline of control of the heliostat in a solar thermal power plant. It is the figure which showed an example of the conventional solar thermal power plant. It is the figure which showed the example from which the conventional solar thermal power plant differs. It is the figure which showed the relationship between the variation | change_quantity of the energy in a conventional solar thermal power plant, and time.

  Hereinafter, a solar thermal power generation plant and a control method thereof according to embodiments of the present invention will be described with reference to the drawings. In FIG. 1, the outline of the solar thermal power generation plant of embodiment which concerns on this invention is shown. The solar thermal power plant 1 has a power generation heat medium circuit 4S and a heat storage heat medium circuit 4A that are independent of each other.

  The power generation heat medium circuit 4S includes a power generation heat receiving portion 3S configured to circulate a power generation heat medium (for example, water vapor), and a power generation device 5 that converts heat energy of the power generation heat medium into electricity. Yes. When the power generation heat medium is steam, the power generation device 5 includes a steam turbine 11 and a generator 12. The power generation heat medium circuit 4S is configured to circulate a power generation heat medium such as steam heated by the power generation heat receiving unit 3S through the power generation device 5 and return it to the power generation heat receiving unit 3S again.

  The heat storage heat medium circuit 4A includes a heat storage heat receiving part 3A configured to circulate a heat storage heat medium (for example, air), a first heat storage tank 6a that supplies and receives heat by supplying the heat storage heat medium, It has the 2nd heat storage tank 6b and the 3rd heat storage tank 6c (Hereinafter, it is set as the heat storage tank 6 when naming generically.). The heat storage heat medium circuit 4A includes a heat exchanger 7 that moves the heat energy of the heat storage heat medium such as air to the power generation heat medium. Here, when the heat storage heat medium is a gas such as air, it is desirable to install a blower 13 for sending the air or the like to the heat storage heat receiving portion 3A.

The heat storage heat medium circuit 4A is configured to circulate a heat storage heat medium such as air heated by the heat storage heat receiving section 3A through the heat storage tank 6 and the heat exchanger 7 and return it to the heat storage heat receiving section 3A again. ing. Here, in the heat storage heat medium circuit 4A, the upstream circuit of the heat storage tank 6 and the heat exchanger 7 is particularly called a high-temperature circuit, and the downstream circuit of the heat storage tank 6 and the heat exchanger 7 is particularly a low-temperature circuit. I will call it. This low temperature side circuit has flow control valves 14 installed on the downstream sides of the respective heat storage tanks 6 and the heat exchanger 7. Moreover, the low temperature side circuit has the three-way valve 15 installed in the downstream of each heat storage tank 6, respectively. Furthermore, the solar thermal power plant 1 has a control device 8 for controlling the flow rate control valve 14, the three-way valve 15, and the like. The alternate long and short dash line indicates a signal line. Of the flow control valve 14 and the three-way valve 15, those that are closed are shown in black.

  Next, the operation of the solar thermal power plant 1 will be described. First, operation in the daytime when solar heat is sufficiently supplied to the solar thermal power plant 1 will be described. In the power generation heat medium circuit 4 </ b> S, a power generation heat medium (which will be described below using steam as an example) is heated to about 650 to 850 ° C. by the power generation heat receiving unit 3 </ b> S and sent to the steam turbine 11. The water vapor that has passed through the steam turbine 11 is sent again to the heat receiving portion 3S for power generation. While repeating the above, the heating medium circuit for power generation 4S generates power in the same manner as in the past (solar thermal power generation control or solar thermal power generation step).

  On the other hand, in the heat storage heat medium circuit 4 </ b> A, a heat storage heat medium (hereinafter, air will be described as an example) is heated to about 650 to 850 ° C. in the heat storage heat receiving portion 3 </ b> A and sent to the heat storage tank 6. The air that has been deprived of heat in the heat storage tank 6 and becomes about 100 to 200 ° C. is sent again to the heat storage heat receiving portion 3A. At this time, since the heat exchanger 7 is not used, the flow control valve 14 installed in the low temperature side circuit (downstream side) of the heat exchanger 7 is closed. While repeating the above, the heat storage heat medium circuit 4A accumulates thermal energy in the heat storage tank 6 (heat storage control or heat storage step).

  Next, the operation in the nighttime when the solar heat power plant 1 is not sufficiently supplied with solar heat or in rainy weather will be described with reference to FIG. At this time, the heat receiving portion 3S for power generation and the heat receiving portion 3A for heat storage cannot receive thermal energy from the sun. In the heat storage heat medium circuit 4 </ b> A, air is sent from the downstream side (downward in FIG. 2) to the upstream side of the heat storage tank 6 by switching the three-way valve 15. The air heated to about 650 to 850 ° C. by receiving heat from the heat storage tank 6 is sent to the heat exchanger 7. The air deprived of heat by the heat exchanger 7 is sent to the heat storage tank 6 again. The flow rate control valve 14 installed between the blower 13 and the heat storage heat medium circuit 4A is closed. The flow control valve 14 and the three-way valve 15 are controlled to be opened and closed by the control device 8.

On the other hand, in the power generation heat medium circuit 4 </ b> S, the steam is heated to about 650 to 850 ° C. by the heat exchanger 7 and sent to the steam turbine 11. The steam that has passed through the steam turbine 11 is sent to the heat exchanger 7 again. While repeating the above, the power generation heat medium circuit 4S uses the thermal energy of the heat storage tank 6 to generate power with the power generation device 5 (heat storage power generation control or heat storage power generation step).
FIG. 3 shows the relationship between the amount of change in energy and time in a solar thermal power plant. In the graph of FIG. 3, E IN indicates the total amount of solar thermal energy received by the heat receiving portion 3S for power generation and the heat receiving portion 3A for heat storage. Moreover, E0 has shown the output energy amount at the time of converting into the electric power the thermal energy received by the heat receiving part 3S for electric power generation by solar thermal power generation control. Furthermore, E1, E2, E3 have shown the energy amount at the time of heat-storing in the heat storage tank 6 the thermal energy received to 3A of heat storage parts by heat storage control. In addition, E4 indicates the amount of output energy when the heat energy stored in the heat storage tank 6 is converted into electric power by heat storage power generation control.

  With the above configuration, the following operational effects can be obtained. First, the solar thermal power plant 1 can be used independently as a main power plant. This is because power can be stably generated using the thermal energy stored in the heat storage tank 6 even at rainy weather (for example, after 18:00) when sufficient sunlight cannot be obtained. Note that, depending on the capacity of the heat storage tank 6, it is possible to stably supply power until the sunrise time of the next day using the heat energy stored in the heat storage tank 6.

  Second, the power generation efficiency of the solar thermal power plant can be dramatically improved. This is because the input energy (equivalent to E1 to E3) of sunlight that has not conventionally contributed to power generation can be stored in the heat storage tank 6 and used for power generation. In particular, the power generation heat medium circuit 4S for performing solar thermal power generation control and the heat storage heat medium circuit 4A for performing heat storage control are formed as independent circuits during the daytime without affecting the conventional solar power generation control. It becomes possible to execute the heat storage control using only surplus energy. Further, the heat storage tank 6 can collect and store energy even immediately after sunrise and just before sunset when the input energy from the sun is small.

  Third, the construction cost of the solar thermal power plant can be suppressed. This is because the flow rate of the air passing through the heat storage tank 6 can be controlled by the configuration in which the flow rate control valve 14 is installed. When this flow control valve 14 is not installed, it is necessary to install a switching valve such as a large and high cost damper or a flow control valve for controlling the flow of the heat storage heat medium in the high temperature side circuit. . Specifically, when the heat storage heat medium is gas, the volume expands greatly depending on the temperature. Therefore, the tube diameter of the high-temperature circuit is larger than the tube diameter of the low-temperature circuit, and the required valve Since it becomes large, the cost becomes high.

  In addition, it can also be set as the structure which does not install the heat exchanger 7 between the heat medium circuit 4S for electric power generation, and the heat medium circuit 4A for heat storage. Even with this configuration, electric power can be recovered from the input energy of sunlight (equivalent to E1 to E3) that has not contributed to power generation. However, in this case, it is necessary to separately install a power generation device in the heat storage heat medium circuit 4A, which increases the construction cost of the solar thermal power plant.

  Moreover, the heat storage tank 6 should just be installed at least one. The heat storage tank 6 may be filled with a liquid such as water as a heat storage material, but it is desirable to use a solid heat storage material. Specifically, ceramic, concrete, or the like can be formed into a spherical shape, a particle shape, or a lump shape, and filled into the heat storage tank 6.

  Furthermore, as the heat storage heat medium, an existing liquid and gas can be used, but preferably air. This is because the internal pressure of the heat storage heat medium circuit 4 </ b> A and the heat storage tank 6 can be set to a low pressure (about atmospheric pressure), and the construction cost of the solar thermal power plant 1 can be suppressed.

  In addition, the heat medium for power generation can use existing liquids and gases, but is preferably water vapor. This is because, with this configuration, the steam generated by the power generation heat receiving portion 3S and the heat exchanger 7 can be directly supplied to the steam turbine 11 of the power generation device 5 to maintain thermal efficiency.

  In FIG. 4, the outline of the different control method in the daytime of the solar thermal power plant 1 is shown. As shown in FIG. 4, the heat storage heat medium circuit 4 </ b> A sends air heated by the heat storage heat receiving part 3 </ b> A to some of the heat storage tanks 6 a and 6 b to perform heat storage control, and at the same time, part of the heat storage tank 6 c The heated air is sent to the heat exchanger 7, and the heat storage power generation control for performing power generation is performed by heating the water vapor of the heat generating medium circuit 4S with this heat (buffer control). The solar power plant 1 that performs this buffer control has at least two heat storage tanks 6.

  Moreover, after sunset, etc., as shown in FIG. 5, each flow control valve 14 and the three-way valve 15 are controlled by the control device 8 to perform heat storage power generation control. At this time, it is desirable to close the flow control valve 14 so that the heat storage heat medium does not flow into the heat storage tank 6c that has released heat energy during the daytime.

FIG. 6 shows the relationship between the amount of change in energy and time in a solar thermal power plant using the buffer control described above. In the graph of FIG. 6, E IN indicates the total amount of solar thermal energy received by the heat receiving portion 3S for power generation and the heat receiving portion 3A for heat storage. Depending on the weather, the input energy E IN may fluctuate rapidly in a short time due to the effect of clouds crossing over the solar thermal power plant 1.

By variation of the input energy E IN, the amount of energy such as steam flowing in the power generating heat medium circuit 4S varies, output energy amount E0 by the power generation device 5 may vary. However, by performing the buffer control described above, when the amount of energy such as water vapor in the heat generating medium circuit 4S is insufficient, heat energy can be supplied from the heat storage tank 6 to water vapor or the like. In other words, the amount of power generated by the power generation device 5 can be kept constant by the buffer control even if there is a change in weather or the like. Here, by the buffer control, the heat energy released from the heat storage tank 6 is not particularly controlled in its release timing or the like, and is configured to be always released to the heat storage heat medium circuit 4A. With this configuration, even momentary fluctuations in the input energy E IN occurs, power generating apparatus 5 can maintain the power generation amount constant.

  In addition, the solar thermal power generation plant 1 which performs buffer control can take out thermal energy from the heat storage tank 6 by the structure which installs the three-way valve 15, and can transmit thermal energy to the heat exchanger 7 via a high temperature side circuit easily. it can. Moreover, the structure which installs the three-way valve 15 for every heat storage tank 6 can perform control which arbitrarily selects the heat storage tank 6 which stores heat, and the heat storage tank 6 which performs heat dissipation.

  FIG. 7 shows an outline (upper part of FIG. 7) when the solar thermal power generation control is performed in the solar thermal power plant 1, and an outline (lower part of FIG. 7) when the power generation control and the heat storage control are performed simultaneously. When performing solar thermal power generation control, the 1st-4th heliostats 21, 22, 23, and 24 concentrate sunlight on the heat receiving part 3S for power generation (upper part of FIG. 7). When the input energy becomes excessive with respect to the heat receiving portion 3S for power generation, for example, the first and second heliostats 21 and 22 are tilted by a signal from the control device 8 (see FIG. 1) to receive heat for heat storage. It changes so that it may condense to the part 3A (FIG. 7 lower) At this time, the 3rd, 4th heliostats 23 and 24 maintain the state which condenses to the heat receiving part 3S for electric power generation. Therefore, heat storage control can be performed simultaneously with solar power generation control.

  Next, the outline of the control of the solar thermal power plant according to another embodiment of the present invention will be described. FIG. 8 shows a plan view of the solar thermal power plant. This solar thermal power generation plant includes a tower having a heat receiving portion 3S for power generation, a tower having a heat receiving portion 3A for heat storage, and a plurality of heliostats 2. In other words, the solar thermal power generation plant is configured to have two or more towers on which at least one of the heat receiving part 3S for power generation or the heat receiving part 3A for heat storage is installed (hereinafter referred to as a multi-tower system). Further, the heliostat 2 painted black is condensed on the heat receiving heat receiving portion 3A, and the other heliostats are condensed on the heat generating heat receiving portion 3S. That is, in the multi-tower type heliostat 2, the tower that is the target of light collection is not fixed. In other words, for example, a certain heliostat may have different towers to be condensed during heat storage control and solar power generation control.

  With this configuration, the power generation efficiency of the solar thermal power plant can be optimized. This is because the optimum light collection efficiency in each time zone differs depending on the position and direction of each heliostat with respect to the tower.

DESCRIPTION OF SYMBOLS 1 Solar thermal power generation plant 2 Heliostat 3S Heat-receiving part 3A for heat generation Heat-receiving part 4S for heat storage Heat-sink circuit 4A for heat-generation Heat-sink-medium circuit 5 Heat-generation apparatus 6, 6a, 6b, 6c Heat storage tank 7 Heat exchanger 8 Controller 11 Steam Turbine 12 Generator 14 Flow control valve 15 Three-way valve

Claims (3)

  1. In a solar thermal power plant having a plurality of heliostats that reflect sunlight, a heat receiving unit that receives sunlight reflected by the heliostat, and a heat medium circuit that circulates a heat medium from the heat receiving unit to a power generation device,
    The solar thermal power plant has an independent power generation heat medium circuit and heat storage heat medium circuit, and a control device,
    The power generation heat medium circuit includes a power generation heat receiving portion through which the power generation heat medium circulates, and a power generation device that converts heat energy of the power generation heat medium into electricity,
    The heat storage heat medium circuit includes a heat storage heat receiving portion through which the heat storage heat medium circulates, at least one heat storage tank that supplies the heat storage heat medium and transfers heat, and heat energy of the heat storage heat medium And a heat exchanger that transmits the heat to the power generation heat medium,
    Each of the heat receiving portion for power generation and the heat receiving portion for heat storage, which are configured as independent heat receiving portions, each have a configuration for receiving sunlight independently,
    The control device of the solar thermal power plant is
    A configuration for performing solar thermal power generation control to generate heat by supplying the heat energy obtained in the heat receiving portion for power generation to the power generation device via the heat generation medium of the power generation heat medium circuit;
    When heat energy exceeding the rated output energy of the power generator can be obtained at the heat receiving portion for power generation, at least a part of the heliostat is tilted to concentrate sunlight on the heat receiving portion for heat storage, and this heat storage A structure for performing heat storage control for supplying heat energy to the heat storage tank through the heat storage heat medium of the heat storage heat medium circuit and storing heat energy obtained in the heat receiving section ;
    When only the heat energy lower than the rated output energy of the power generator can be obtained at the heat receiving portion for power generation, at least a part of the heliostat is tilted to concentrate sunlight on the heat receiving portion for heat storage, A solar power generation plant having a configuration for performing heat storage control in which heat energy obtained in a heat storage heat receiving section is supplied to the heat storage tank through the heat storage heat medium of the heat storage heat medium circuit and stored. .
  2. The heat storage heat medium circuit has at least two heat storage tanks;
    While the solar power generation control is being performed by the control device, thermal energy is constantly supplied from at least one heat storage tank to the heat generating medium via the heat exchanger and supplied to the power generation device. The solar thermal power plant according to claim 1 , wherein the solar thermal power plant has a configuration for performing buffer control for maintaining constant heat energy.
  3. The heat storage heat medium circuit has a high temperature side circuit formed on the upstream side of the heat storage tank and the heat exchanger, and a low temperature side circuit formed on the downstream side,
    The low temperature side circuit has flow control valves respectively installed on the downstream side of the heat storage tank and the heat exchanger, and the high temperature side circuit does not have a valve for controlling the flow of the heat storage heat medium. The solar thermal power plant according to claim 1 or 2 , characterized by the above-mentioned.
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