WO2015156402A1

WO2015156402A1 - Solar heat storage system

Info

Publication number: WO2015156402A1
Application number: PCT/JP2015/061287
Authority: WO
Inventors: 裕昭桐木; 久保　修一
Original assignee: イビデン株式会社
Priority date: 2014-04-11
Filing date: 2015-04-10
Publication date: 2015-10-15
Also published as: JP2015203515A

Abstract

A solar heat storage system (100) equipped with: a heat reception unit (1) that absorbs solar heat; an energy conversion unit (2) that extracts energy from a heat medium that has passed through the heat reception unit (1) and has absorbed solar heat; a flow path conduit (3) that connects the heat reception unit (1) and the energy conversion unit (2), and through which the heat medium circulates; and a buffer device (4) that is connected to the flow path conduit (3), and through which the heat medium circulates. The buffer device (4) includes a case (44), and a solid material (43, 45) which is provided inside the case (44) and makes direct contact with the heat medium, and through which the heat medium can pass.

Description

Solar heat storage system

The present invention relates to a solar heat storage system.

In recent years, countermeasures against fossil fuel depletion and environmental destruction have become major issues. In order to solve such problems, studies and use of natural energy such as hydropower, wind power, tidal power, wave power, geothermal heat, sunlight, and solar heat are being promoted. Above all, solar power generation using solar heat can obtain large energy with relatively inexpensive equipment, and it can generate power at night by using a heat accumulator, so as a large-scale power generation using natural energy, Attention has been paid.

In solar power generation using solar cells, the area of the power generation panel is highly correlated with the amount of power generation and equipment costs. On the other hand, in solar power generation using a mirror to collect heat, there is a correlation between the area of the mirror and the amount of power generation, but since the mirror is not a high-cost facility, the correlation between the area of the mirror and the power generation cost is not high. For this reason, there is a feature that the power cost becomes cheaper as the power generation facility becomes larger, which is suitable for large-scale power generation.

However, the larger the scale of solar thermal power generation, the greater the impact of fluctuations in power generation on the power system. For example, in solar thermal power generation, the amount of power generation may suddenly decrease due to clouding or the like. In order to solve such a problem, Patent Document 1 proposes a regenerator that responds to short-time fluctuations separately from a regenerator for nighttime power generation.

Specifically, a plurality of first heat storage tanks that carry a phase change medium and through which a heat medium flows and a second heat storage tank that does not include a phase change medium are connected in parallel to the solar field. By using such a system, when sunlight cannot be obtained suddenly due to cloudiness or the like, supply of the heat medium to the stratification tank (first heat storage tank) is stopped, and instead, the stratification tank (second The heat medium stored in the heat storage tank) is released to the outside. That is, when sufficient sunlight cannot be obtained suddenly, the heat medium stored in the stratification tank (second heat storage tank) is supplied to the solar heat radiator. Since the high-temperature heat medium has been supplied to the stratification tank (second heat storage tank) until just before, a high-temperature heat medium in which the temperature has hardly decreased can be supplied to the solar heat radiating unit. By doing in this way, responsiveness can be made more favorable. That is, it is possible to prevent the power generation system from being cooled when sufficient sunlight cannot be obtained due to clouds or the like. Thus, it is described that a decrease in the amount of power generation due to weather changes can be suppressed.

Japanese Unexamined Patent Publication No. 2014-47992

However, the impact of solar thermal power generation on the power system increases as the scale increases. If the responsiveness of the heat accumulator is poor during cloudy weather, sufficient heat energy cannot be supplied, resulting in a decrease in the amount of power generation, causing voltage fluctuations and frequency fluctuations.

In view of such a problem, an object of the present invention is to provide a solar heat storage system capable of stably supplying thermal energy.

The solar heat storage system of the present invention connects a heat receiving part that absorbs solar heat, an energy conversion part that extracts energy from a heat medium that has passed through the heat receiving part and absorbed the solar heat, and the heat receiving part and the energy conversion part. And a flow path pipe through which the heat medium flows, and a shock absorber connected to the flow path pipe and allowing the heat medium to pass therethrough, the shock absorber being provided inside the case, The heat medium that is in direct contact with the heat medium includes a solid material that is permeable to the heat medium together with direct contact.
According to such a solar heat storage system, it has a shock absorber that is internally provided with a solid material that can cope with sudden output fluctuations. In the solid material, the heat medium can enter the inside, and can directly exchange heat with the heat medium, so that heat can be efficiently extracted. For this reason, even if there is a sudden weather change at the time of power generation, the influence on voltage fluctuation and frequency fluctuation can be reduced.

The solar heat storage system of the present invention preferably further has the following mode.

The solid material is an object selected from at least one of a granule, an aggregate of plates, a foam, and a honeycomb.
When the solid material is a granule, a multilayer board, a foam or a honeycomb body, the heat medium can pass through the inside with a small resistance. For example, even when the sun is clouded and the generated energy is drastically reduced, the amount of heat that smoothly compensates for the decrease in power generation can be supplied without interruption.

The shock absorber has a first connection hole and a second connection hole connected to the flow path pipe, and the solid material is a flow of a heat medium connecting the first connection hole and the second connection hole. Is a honeycomb body in which a flow path is arranged along.
The honeycomb body has little resistance in the direction of the flow path and can increase the area of the inner wall that directly exchanges heat with the heat medium, so that the flow of the heat medium that connects the first connection hole and the second connection hole By arranging the flow path along, the heat energy stored inside the honeycomb body can be efficiently extracted.

The solar heat storage system is connected in series in the order of the heat receiving unit, the buffer, and the energy conversion unit along the flow of the heat medium.
The thermal energy supplied to the energy conversion unit is stabilized by temporarily storing the heat energy generated in the heat receiving unit in an intermediate buffer by connecting the heat receiving unit, the buffer, and the energy conversion unit in series. can do. In the case where the heat receiving unit, the buffer, and the energy conversion unit are connected in series in this order, the heat medium may or may not be circulated. If it is not circulated, it is preferable to use air as the heat medium. When air is used as the heat medium in a solar heat storage system that does not circulate the heat medium, the air after the heat energy is taken out by the energy conversion part can be released after the air near the heat receiving part is taken in.

The flow path pipe forms a closed circuit in which a heat medium circulates between the heat receiving unit and the energy conversion unit, and the shock absorber is connected in parallel with the heat receiving unit and the energy conversion unit. In addition, the connection portion between the buffer and the high-temperature channel pipe has a first switching valve that closes the flow of the heat medium to the heat receiving unit or the buffer, and the buffer and the low-temperature channel A connection point with the pipe has a second switching valve that closes the flow of the heat medium to the heat receiving unit or the shock absorber in conjunction with the first switching valve.
When the flow path piping forms a closed circuit so that the heat medium circulates and the shock absorber is provided in parallel with the heat receiving unit and the energy conversion unit, the generated energy is drastically decreased due to clouds on the sun. However, the amount of heat can be supplied without interruption, smoothly compensating for the decrease in the amount of power generation. In the case of such a flow pipe configuration, when heat energy is generated in the heat receiving part, both the first switching valve and the second switching valve are opened in all directions, and the heat energy received in the heat receiving part is converted into energy. Distribute parts and shock absorbers. When the heat energy generated in the heat receiving portion is reduced, the flow of the first switching valve and the second switching valve to the heat receiving portion is reduced, and the flow of the heat medium centering on the loop between the buffer and the energy conversion portion is reduced. Form. By controlling in this way, for example, even when a cloud is applied to the sun and the generated energy is drastically reduced, the amount of heat that smoothly compensates for a decrease in the amount of power generation can be supplied without interruption.

The shock absorber has a first flow control valve, and has a bypass pipe provided with a second flow control valve in parallel with the shock absorber.
By having the first flow rate control valve in the shock absorber and the bypass pipe having the second flow rate control valve in parallel with the shock absorber, the amount of heat energy to the energy conversion unit is from only the heat receiving unit. It can be freely adjusted in the range of heat energy and heat energy only from the buffer. By making such adjustment, it is possible to prevent hunting or overshooting of the amount of heat energy to the energy conversion unit. More effective effects can be obtained by actively controlling the sun when the sun begins to shine after the sun is clouded.

The first flow rate control valve and the second flow rate control valve are controlled by a control device that keeps the temperature of the heat medium introduced into the energy conversion unit constant.
Furthermore, by controlling the first flow rate control valve and the second flow rate control valve with a control device that keeps the temperature of the heat medium constant, fluctuations in the amount of power generation can be suppressed, and the effect on the power system Can be reduced.

The shock absorber has a first flow rate control valve, and a heat accumulator having a larger heat capacity than the shock absorber provided with a third flow rate control valve in parallel with the shock absorber.
The shock absorber has a first flow rate control valve, and has a heat accumulator having a larger heat capacity than the shock absorber provided with a third flow rate control valve in parallel with the shock absorber. It can be distributed appropriately. When sunshine is weak, open the first flow control valve, throttle the third flow control valve, reduce the ratio of heat energy to store heat, and when sunshine is strong, throttle the first flow control valve and open the third flow control valve , Excess heat energy can be stored.

The first flow rate control valve and the third flow rate control valve are controlled by a control device that keeps the temperature of the heat medium introduced into the energy conversion unit constant.
Furthermore, by controlling the first flow rate control valve and the third flow rate control valve with a control device that keeps the temperature of the heat medium constant, fluctuations in the amount of power generation can be suppressed, and the effect on the power system Can be reduced.

Than the first flow rate control valve in the shock absorber, a bypass pipe having a second flow rate control valve in parallel with the shock absorber, and the shock absorber having a third flow rate control valve in parallel with the shock absorber And a heat accumulator having a large heat capacity.
By having the first flow rate control valve in the shock absorber and the bypass pipe having the second flow rate control valve in parallel with the shock absorber, the amount of heat energy to the energy conversion unit is from only the heat receiving unit. It can be freely adjusted in the range of heat energy and heat energy only from the buffer. By making such adjustment, it is possible to prevent hunting or overshooting of the amount of heat energy to the energy conversion unit. More effective effects can be obtained by actively controlling the sun when the sun begins to shine after the sun is clouded.
Furthermore, by having a heat accumulator having a larger heat capacity than the shock absorber provided with the third flow control valve in parallel with the shock absorber, the heat energy generated in the heat receiving portion can be appropriately distributed. When sunshine is weak, open the first flow control valve, throttle the third flow control valve, reduce the ratio of heat energy to store heat, and when sunshine is strong, throttle the first flow control valve and open the third flow control valve , Excess heat energy can be stored.

The first flow control valve, the second flow control valve, or the third flow control valve is connected to a control device that keeps the temperature of the heat medium introduced into the energy conversion unit constant.
Furthermore, by controlling the first flow rate control valve, the second flow rate control valve, and the third flow rate control valve with a control device that keeps the temperature of the heat medium constant, fluctuations in the power generation amount can be suppressed. The influence on the power system can be reduced.

The solar heat storage system of the present invention has a shock absorber that is internally provided with a solid material that can cope with sudden output fluctuations. In the solid material, the heat medium can enter the inside, and can directly exchange heat with the heat medium, so that heat can be efficiently extracted. For this reason, even if there is a sudden weather change at the time of power generation, the influence on voltage fluctuation and frequency fluctuation can be reduced.

System configuration diagram of a solar thermal power generation system including a solar thermal storage system according to an embodiment of the present invention It is an example of the buffer in a solar heat storage system, (a) is a perspective view of the example comprised including a honeycomb body and (b) the aggregate | assembly of a board | plate inside. System configuration diagram of a solar heat storage system in which the heat receiving part, the shock absorber, and the energy conversion part are connected in series, and both ends of the channel pipe are open System configuration diagram of a solar heat storage system in which the heat receiving section, the buffer, and the energy conversion section are connected in series, and the flow path piping forms a closed circuit System configuration diagram of a solar heat storage system in which the heat receiving unit, the buffer, and the energy conversion unit are connected in parallel, and the flow path piping forms a closed circuit The example of the structure of the buffer heat | fever periphery (stagnation part) of a solar thermal storage system is shown, (a) is an example in which a stay part is comprised only from a buffer, (b) is a buffer and bypass piping connected in parallel. It is an example of a stay part, (c) is an example of the stay part in which the shock absorber and the heat accumulator are connected in parallel, and (d) is an example of the stay part in which the shock absorber, the heat accumulator and the bypass pipe are connected in parallel. System configuration diagram of an example of a solar heat storage system System configuration diagram of another example of solar thermal storage system System configuration diagram of still another example of a solar heat storage system

The present invention will be described in detail with reference to the drawings. FIG. 1 is a system configuration diagram of a solar thermal power generation system 1000 using a solar thermal storage system 100 according to an embodiment of the present invention. The solar thermal power generation system 1000 includes a mirror 120, a solar thermal storage system 100, and a steam gas turbine generator 130. In this embodiment, the energy conversion unit 2 that mediates the solar heat storage system 100 and the steam gas turbine generator 130 is configured by a heat exchanger.

The solar heat storage system 100 of this embodiment connects the heat receiving part 1 which absorbs the solar heat of sunlight guided by the mirror 120, the energy conversion part 2, the heat receiving part 1 and the energy conversion part 2, and the heat medium circulates. And a shock absorber 4 that is connected to the flow path pipe 3 and through which the heat medium passes. Here, the shock absorber 4 is provided inside the housing 44 (see FIG. 2), and a solid material (a honeycomb body in the example of FIG. 2) that allows the heat medium to directly contact and transmit the heat medium. 43 or an assembly of plates 45). The heat medium that passes through the heat receiving unit 1 absorbs solar heat absorbed by the heat receiving unit 1 and circulates through the flow pipe 3, and the energy conversion unit 2 plays a role of extracting energy based on solar heat from the heat medium. The steam gas turbine generator 130 is operated by the extracted energy, and electric power is generated.

The solar heat storage system 100 is capable of dealing with sudden output fluctuations, and has a solid material inside the shock absorber 4 through which the heat medium directly contacts and through which the heat medium can pass. The solid material can infiltrate the heat medium inside and can directly exchange heat with the heat medium, so that heat can be efficiently extracted. For this reason, even if there is a sudden weather change at the time of power generation, the influence on voltage fluctuation and frequency fluctuation can be reduced.

The solar heat storage system 100 includes a bypass pipe 71 and a heat storage 72 that are provided in parallel with the shock absorber 4. The portion where the heat medium around the shock absorber 4 stays is defined as the stay portion A, and the shock absorber 4, the bypass pipe 71, the heat accumulator 72, and the first to third flow

rate control valves

61, 62, 63 (see FIG. 6). It can be included in the retention part.

The solar heat storage system of the present invention has various modes, for example, by changing the following components. Of course, the solar heat storage system is not limited to the following components.

(A) Aspect of solid material provided inside shock absorber (B) Connection method of shock absorber B1 Heat receiving portion, shock absorber, energy conversion portion are in series and both ends open B2 Heat receiving portion, shock absorber, energy conversion portion Closed circuit in series B3 Heat receiving part, shock absorber, energy conversion part in parallel with closed circuit (C) Bypass pipe provided in parallel with buffer, presence or absence of heat accumulator (mode of staying part)
C1 shock absorber only C2 shock absorber and bypass piping C3 shock absorber and heat storage C4 shock absorber, bypass piping and heat storage

<(A) Aspect of solid material provided in shock absorber>
FIG. 2 is a perspective view showing an example of an embodiment of the shock absorber 4 used in the solar heat storage system 100. (a) is an example in which the solid material inside the shock absorber 4 is a honeycomb body, and (b) is a shock absorber 4. The solid material inside is an example of an assembly of plates. In FIG. 2, in order to explain the solid material inside the shock absorber 4, it is shown in a state where the inside can be seen through the housing 44 of the shock absorber 4.

In the example of FIG. 2A, a first connection hole 41 and a second connection hole 42 connected to the flow path pipe 3 are provided at both ends of the housing 44. A honeycomb body 43 in which a flow path 43a is disposed along the flow of the heat medium connecting the first connection hole 41 and the second connection hole 42 as a solid material is provided inside the housing 44.

In the example of FIG. 2B, the first connection hole 41 and the second connection hole 42 connected to the flow path pipe 3 are provided at both ends of the housing 44. An assembly 45 of plates arranged along the flow of the heat medium connecting the first connection hole 41 and the second connection hole 42 as a solid material is provided inside the housing 44. The plate assembly 45 includes a plurality of plates 45b arranged in parallel to each other, and a flow path 45a is formed between the plates 45b.

As in the above example, the type of solid material is not particularly limited, and examples thereof include honeycomb bodies, aggregates of plates, foams, and granules.

As the honeycomb body, a honeycomb body made of a metal such as iron or aluminum can be used in addition to a ceramic honeycomb body such as SiC, cordierite, alumina, graphite, or carbon.

The aggregate of the plates is not particularly limited. For example, it is an aggregate of plates arranged at intervals and preferably parallel to each other. The material of the plate is not particularly limited. In addition to ceramic plates such as SiC, cordierite, alumina, graphite, and carbon, plates such as metals such as iron and aluminum can also be used.

Examples of the foam include pumice obtained by volcanic eruption, ceramic foam such as carbon foam obtained by carbonizing foamed phenol resin, and metal foam having pores inside the metal.

The granule is not particularly limited, and examples thereof include metals and ceramics. In the case of ceramic, for example, particles obtained by coarse pulverization with a jaw crusher or the like can be used. The average particle diameter of the granules is not particularly limited, but is, for example, 1 to 30 mm. The average particle diameter of the granules can be measured by a sizing method using a multistage sieve. Specifically, it is obtained by analyzing the size of the voids of the sieve and the weight passing through each sieve.

There are no particular restrictions on the material of the solid material in any form, but for example, ceramics such as graphite, SiC, cordierite, and alumina, and metals such as iron and aluminum can be used. Among these, ceramics can be suitably used because they have corrosion resistance and heat resistance.

The honeycomb body 43 shown in FIG. 2 (a) has little resistance in the direction of the flow path and can increase the area of the inner wall that directly exchanges heat with the heat medium. Therefore, by disposing the flow path along the flow of the heat medium that connects the first connection hole 41 and the second connection hole 42, it is possible to efficiently draw out the thermal energy stored in the honeycomb body 43.

<(B) Connection method of shock absorber>
As described above, the shock absorbers are connected as follows, for example.
B1 Heat-receiving unit, buffer, energy conversion unit are connected in series and both ends are open B2 Heat-receiving unit, buffer, energy conversion unit are closed in series B3 Heat-receiving unit, buffer, energy conversion unit are closed circuit in parallel

The type of energy conversion unit is not particularly limited. In the example of FIG. 1, the energy conversion part 2 is comprised from the heat exchanger which heats another heat medium using the heat energy of a heat medium. The energy conversion unit can also be configured by a turbine that converts the heat energy of the heat medium directly into kinetic energy. The turbine is appropriately selected depending on the type of heat medium, and a steam turbine, a gas turbine, or the like can be used.

The heat receiving unit 1 in the embodiment of FIG. 1 is a light-heat conversion medium provided in the light collecting unit of the mirror, and various forms such as a honeycomb shape and a porous shape can be used.

FIG. 3 is a system configuration diagram illustrating an example of the solar heat storage system 100 in which the heat receiving unit 1, the buffer 4, and the energy conversion unit 2 are connected in series by the flow channel pipe 3 and both ends of the flow channel pipe 3 are opened. (B1). When the heat receiving unit 1, the shock absorber 4, and the energy conversion unit 2 are connected in series and both ends are open, since both ends are open, for example, air can be used as the heat medium.
In the heat receiving unit 1, ambient air is taken in as a heat medium, heated by the heat receiving unit 1, passed through the buffer pipe 4 through the flow path pipe 3, and then guided to the energy conversion unit 2. In the energy conversion unit 2, for example, heat exchange or conversion into kinetic energy by a turbine is performed. After that, the air as the heat medium is returned to the atmosphere. In the solar heat storage system 100 having this configuration, since heat energy is stored in the shock absorber 4, even if the amount of sunlight is reduced, the heat energy delivered to the energy conversion unit 2 does not decrease rapidly but decreases gently. In addition, the influence on the power system can be reduced.

FIG. 4 is a system configuration diagram illustrating an example of a solar heat storage system 100 in which the heat receiving unit 1, the shock absorber 4, and the energy conversion unit 2 are connected in series by the flow channel pipe 3 and the flow channel pipe 3 forms a closed circuit. (B2). When the heat receiving unit 1, the shock absorber 4, and the energy conversion unit 2 form a closed circuit in series connection, the flow path pipe 3 is not opened so that the heat medium returns from the energy conversion unit 2 to the heat receiving unit 1. Composed. For this reason, a heat medium is not specifically limited, Various things, such as various heat medium oil, gas, a vapor | steam, can be utilized.

In the heat receiving unit 1, various heat mediums such as oil, gas, and steam are heated by the heat receiving unit 1, and after passing through the flow path pipe 3 and the buffer 4, are then guided to the energy conversion unit 2. In the energy conversion unit 2, for example, heat exchange or conversion into kinetic energy by a turbine is performed. Thereafter, the cooled heat medium is returned to the heat receiving unit 1 via the flow path pipe 3. In the solar heat storage system 100 having this configuration, since heat energy is stored in the shock absorber 4, even if the amount of sunlight is reduced, the heat energy delivered to the energy conversion unit 2 does not decrease rapidly but decreases gently. In addition, the influence on the power system can be reduced.

FIG. 5 is a system configuration diagram illustrating an example of a solar heat storage system 100 in which the heat receiving unit 1, the buffer 4, and the energy conversion unit 2 are connected in parallel by the flow channel pipe 3 and the flow channel pipe 3 forms a closed circuit. (B3). When the heat receiving unit 1, the shock absorber 4, and the energy conversion unit 2 are connected in parallel to form a closed circuit, the flow path pipe 3 is not opened, and the heat medium returns from the energy conversion unit 2 to the heat receiving unit 1. Composed. For this reason, a heat medium is not specifically limited, Various things, such as various heat medium oil, gas, a vapor | steam, can be utilized.

Furthermore, in this embodiment, a first switching valve 51 that closes the flow of the heat medium to the heat receiving portion 1 or the shock absorber 4 is provided at a connection location between the shock absorber 4 and the high-temperature side passage pipe 3. Further, a second switching valve 52 that closes the flow of the heat medium to the heat receiving portion 1 or the buffer 4 in conjunction with the first switching valve 51 is connected at a connection portion between the buffer 4 and the low-temperature side pipe 3. Is provided.

In the heat receiving unit 1, various heat mediums such as oil, gas, and steam are heated by the heat receiving unit 1, and then passed through the flow pipe 3 and distributed to the buffer 4 and the energy conversion unit 2 by the first switching valve 51. Is done. The energy conversion unit 2 exclusively performs, for example, heat exchange or conversion into kinetic energy by a turbine. Further, the shock absorber 4 stores thermal energy. After that, the heat medium that has passed through the buffer 4 and the energy conversion unit 2 is collected by the second switching valve 52 and returned to the heat receiving unit 1 through the flow path pipe 3. In the solar heat storage system 100 having this configuration, when the amount of sunshine decreases, the heat receiving portion 1 side of the first switching valve 51 and the second switching valve 52 is throttled so that the heat medium flows in the reverse direction in the shock absorber 4. Become. By such an operation, the thermal energy accumulated in the shock absorber 4 is guided to the energy conversion unit 2, and a decrease in the amount of power generated due to a decrease in the amount of sunlight can be compensated.

<(C) Presence / absence of bypass pipe and heat accumulator provided in parallel with shock absorber (mode of staying part)>
Next, the bypass pipe 71 and the heat accumulator 72 provided in parallel with the shock absorber 4 will be described. In the present embodiment, a portion where the heat medium around the shock absorber 4 stays is referred to as a stay portion A (see FIG. 1). In addition to the shock absorber 4, a bypass pipe 71, a heat accumulator 72, first to third

flow control valves

61, 62 and 63 may be included in the staying portion.

As shown in FIG. 6, examples of the staying part include the following four forms. This will be described in order below.

C1 shock absorber only C2 shock absorber and bypass piping C3 shock absorber and heat storage C4 shock absorber, bypass piping and heat storage

The heat accumulator 72 has a larger heat capacity than the shock absorber 4. Inside the heat accumulator 72, for example, a lump of concrete, a latent heat storage material, or the like is enclosed. When a latent heat storage material is used for the heat accumulator 72, a flow path pipe passes through the heat accumulator 72, and heat exchange is performed by heat transfer on the wall of the flow path pipe.

As shown in FIG. 6 (a), in the case of the solar heat storage system (C1) in which the staying portion is composed only of the shock absorber 4, the solar heat can absorb the decrease in the amount of sunlight due to the action of the shock absorber 4 with a simple structure. A heat storage system can be provided, and the influence of changes in the amount of sunlight on the power system can be reduced.

As shown in FIG. 6 (b), in the case of the solar heat storage system (C2) composed of the shock absorber 4 and the bypass pipe 71 in which the stay portions are connected in parallel, the first flow rate control valve is provided on the shock absorber 4 side. A second flow rate control valve is provided on the bypass pipe side.

By providing the first flow rate control valve 61 on the upstream side of the shock absorber 4 and providing the bypass pipe 71 having the second flow rate control valve 62 in parallel with the shock absorber 4, the amount of heat energy to the energy conversion unit 2 is The heat energy from only the heat receiving unit 1 and the heat energy from only the buffer 4 can be freely adjusted. By making such adjustment, it is possible to prevent hunting or overshooting of the amount of heat energy to the energy conversion unit 2. More effective effects can be obtained by actively controlling the sun when the sun begins to shine after the sun is clouded.

Furthermore, the first flow rate control valve 61 and the second flow rate control valve 62 of the solar heat storage system of the present embodiment are preferably controlled by the control device 80 that keeps the temperature of the heat medium introduced into the energy conversion unit 2 constant. (See FIG. 8).

Specifically, the control device 80 measures the temperature of the heat medium in the inlet of the energy conversion unit 2, the outlet of the buffer 4, and the bypass pipe 71, and the first flow control valve 61 according to the obtained temperature value. And the opening degree of the 2nd flow control valve 62 is adjusted.

It should be noted that the temperature of the heat medium in the bypass pipe 71 is the same temperature as long as it is within the range from the heat receiving portion 1 to the bypass pipe 71 or the buffer 4 inlet, and may be measured anywhere.

Note that the inlet and the outlet are defined with respect to the flow direction of the heat medium. For this reason, when the heat receiving part 1, the shock absorber 4, and the energy conversion part 2 form a closed circuit as shown in FIG. 5 (B3), the flow direction of the heat medium with respect to the shock absorber 4 is switched. The inlet and outlet vary depending on the direction in which the heat medium flows.

Furthermore, by controlling the first flow rate control valve 61 and the second flow rate control valve 62 by the control device 80 that keeps the temperature of the heat medium constant, fluctuations in the amount of power generation can be suppressed, and the power system Can be reduced.

As shown in FIG. 6 (c), in the case of a solar heat storage system (C3) composed of a shock absorber 4 and a heat accumulator 72 in which the staying portions are connected in parallel, the first flow control valve 61 is provided on the shock absorber 4 side. And a third flow rate control valve 63 is provided on the regenerator 72 side.

By providing a first flow rate control valve 61 upstream of the shock absorber 4 and providing a heat accumulator 72 having a larger heat capacity than the shock absorber 4 provided with the third flow rate control valve 63 in parallel with the shock absorber 4, the heat receiving portion 1. The heat energy generated in can be appropriately distributed. When the sunlight is weak, the first flow control valve 61 is opened and the third flow control valve 63 is throttled to reduce the ratio of heat energy to be stored. When the sunlight is strong, the first flow control valve 61 is throttled to control the third flow control. The valve 63 can be opened to store excess heat energy.

The first flow rate control valve 61 and the third flow rate control valve 63 of the solar heat storage system of the present embodiment are preferably controlled by a control device 80 that keeps the temperature of the heat medium introduced into the energy conversion unit 2 constant ( (See FIG. 8).

Specifically, the temperature of the heat medium at the inlet of the energy conversion unit 2, the outlet of the shock absorber 4 and the outlet of the heat accumulator 72 is measured, and the first flow control valve 61 and the third The opening degree of the flow control valve 63 is adjusted.

Furthermore, by controlling the first flow rate control valve 61 and the third flow rate control valve 63 by the control device 80 that keeps the temperature of the heat medium constant, fluctuations in the amount of power generation can be suppressed, and the power system Can be reduced.

As shown in FIG. 6 (d), in the case of the solar heat storage system (C4) including the shock absorber 4, the bypass pipe 71, and the heat accumulator 72 in which the staying portions are connected in parallel, A first flow rate control valve 61 is provided, a second flow rate control valve 62 is provided on the bypass pipe 71 side, and a third flow rate control valve 63 is provided on the heat accumulator 72 side.

By providing the first flow rate control valve 61 on the upstream side of the shock absorber 4 and having the bypass pipe 71 having the second flow rate control valve 62 in parallel with the shock absorber 4, the amount of heat energy to the energy conversion unit 2 is The heat energy from only the heat receiving unit 1 and the heat energy from only the buffer 4 can be freely adjusted. By making such adjustment, it is possible to prevent hunting or overshooting of the amount of heat energy to the energy conversion unit 2. More effective effects can be obtained by actively controlling the sun when the sun begins to shine after the sun is clouded.

Furthermore, by having the heat accumulator 72 having a larger heat capacity than the shock absorber 4 provided with the third flow rate control valve 63 in parallel with the shock absorber 4, the heat energy generated in the heat receiving section 1 can be appropriately distributed. When the sunlight is weak, the first flow control valve 61 is opened and the third flow control valve 63 is throttled to reduce the ratio of heat energy to be stored. When the sunlight is strong, the first flow control valve 61 is throttled to control the third flow control. The valve 63 can be opened to store excess heat energy.

The first flow control valve 61, the second flow control valve 62, or the third flow control valve 63 of the solar heat storage system of the present embodiment is provided in the control device 80 that keeps the temperature of the heat medium introduced into the energy conversion unit 2 constant. It is preferable that they are connected (see FIG. 8).

Furthermore, fluctuations in the amount of power generation are suppressed by actively controlling the first flow rate control valve 61, the second flow rate control valve 62, and the third flow rate control valve 63 by the control device 80 that keeps the temperature of the heat medium constant. And the influence on the power system can be reduced. *

FIG. 7 shows an example of the solar heat storage system 100, and the retention portion shown in FIG. 6C is incorporated in the configuration in which both ends of the flow path pipe 3 shown in FIG. 3 are opened. The solar heat storage system 100 having such a configuration can suitably use air as a heat medium.

FIG. 8 shows another example of the solar heat storage system 100, and the retention portion shown in FIG. 6 (d) is incorporated in the closed circuit configuration of the flow path pipe 3 shown in FIG. The heat medium is not particularly limited, and various heat medium oils, gases, steams, and the like can be used. In addition, although the control apparatus 80 is shown only in this figure, naturally a control apparatus is applicable also to the form shown in the other figure.

FIG. 9 shows another example of the solar heat storage system 100. In the closed circuit configuration of the flow path pipe 3 shown in FIG. 5, the first flow control is performed between the first switching valve 51 and the second switching valve 52. A series connection of the valve 61 and the shock absorber 4 and a series connection of the third flow rate control valve 63 and the heat accumulator 72 are provided in a mutually connected state. The heat medium is not particularly limited, and various heat medium oils, gases, steams, and the like can be used.

Although the embodiments of the present invention have been described above, the present invention is not limited to the matters shown in the above embodiments, and those skilled in the art will understand the scope of the claims and the description, and based on well-known techniques. Modifications or applications are also contemplated by the present invention and are within the scope of seeking protection.

This application is based on Japanese Patent Application No. 2014-082220 filed on Apr. 11, 2014, the contents of which are incorporated herein by reference.

According to the solar heat storage system of the present invention, it is possible to suppress the influence on the voltage fluctuation and the frequency fluctuation even if there is a sudden weather change. Can be promoted.

DESCRIPTION OF SYMBOLS 1 Heat receiving part 2 Energy conversion part 3 Channel piping 4 Shock absorber 41 1st connection hole 42 2nd connection hole 43 Honeycomb body (solid material)
44 Housing 45 Aggregation of plates (solid material)
51 1st switching valve 52 2nd switching valve 61 1st flow control valve 62 2nd flow control valve 63 3rd flow control valve 71 Bypass piping 72 Regenerator 80 Control device 100 Solar thermal storage system 110 Solar 120 Mirror 130 Steam gas turbine power generation 1000 Solar Power Generation System

Claims

A heat receiving part that absorbs solar heat;
An energy conversion unit that extracts energy from a heat medium that has absorbed the solar heat through the heat receiving unit;
A flow path pipe through which a heat medium flows, connecting the heat receiving section and the energy conversion section;
A shock absorber connected to the flow path pipe and through which the heat medium passes,
The shock absorber includes a housing and a solid material that is provided inside the housing and is in direct contact with the heat medium and is permeable to the heat medium.
Solar heat storage system.
The solar heat storage system according to claim 1, wherein the solid material is an object selected from at least one of a granular body, an aggregate of plates, a foam body, and a honeycomb body.
The shock absorber has a first connection hole and a second connection hole connected to the flow path pipe, and the solid material is a flow of a heat medium connecting the first connection hole and the second connection hole. The solar heat storage system of Claim 2 which is a honeycomb body by which the flow path was arrange | positioned along.
The solar heat storage system according to any one of claims 1 to 3, wherein the solar heat storage system is connected in series in the order of the heat receiving unit, the buffer, and the energy conversion unit along a flow of a heat medium.
The solar heat storage system is
The flow path pipe forms a closed circuit in which a heat medium circulates between the heat receiving unit and the energy conversion unit, and the shock absorber is connected in parallel with the heat receiving unit and the energy conversion unit. ,
A connection point between the shock absorber and the high-temperature channel pipe has a first switching valve that closes the flow of the heat medium to the heat receiving portion or the shock absorber,
A connection point between the shock absorber and the low-temperature channel pipe has a second switching valve that closes the flow of the heat medium to the heat receiving part or the shock absorber in conjunction with the first switching valve;
The solar thermal storage system of any one of Claim 1 to 3.
The solar heat storage system according to any one of claims 1 to 5, wherein the shock absorber has a first flow rate control valve, and has a bypass pipe having a second flow rate control valve in parallel with the shock absorber.
The solar heat storage system according to claim 6, wherein the first flow rate control valve and the second flow rate control valve are controlled by a control device that keeps the temperature of the heat medium introduced into the energy conversion unit constant.
The shock absorber has a first flow control valve;
The solar heat storage system is
The solar thermal energy storage system of any one of Claim 1 to 5 which has a thermal storage with a larger heat capacity than the said buffer provided with the 3rd flow control valve in parallel with the said buffer.
The solar heat storage system according to claim 8, wherein the first flow rate control valve and the third flow rate control valve are controlled by a control device that keeps the temperature of the heat medium introduced into the energy conversion unit constant.
The shock absorber has a first flow control valve;
The solar heat storage system is
A bypass pipe provided with a second flow control valve in parallel with the buffer;
A heat accumulator having a larger heat capacity than the shock absorber provided with a third flow rate control valve in parallel with the shock absorber;
The solar heat storage system of any one of Claim 1 to 5 which has these.
The said 1st flow control valve, the said 2nd flow control valve, or the said 3rd flow control valve is connected to the control apparatus which makes constant the temperature of the heat carrier introduced into the said energy conversion part. The described solar heat storage system.