JP2003269322A - Solar thermal power plant - Google Patents

Abstract

(57) Abstract: The present invention relates to a solar thermal power generation device that converts sunlight into thermal energy to generate power, and realizes a solar thermal power generation device with a high solar heat utilization rate that can be reduced in size with a simple configuration. Things. SOLUTION: The solar thermal power generation device of the present invention is a reciprocating expander in which a solar heat collector 1 for evaporating an evaporable liquid and a magnetic material displacer 8 inside and a coil 9 arranged on the outer periphery. 2, the condenser 3, and the pressure increasing means 4 are connected in order to form a closed circuit, and the opening / closing means 1 bypasses the expander 2.
A bypass pipe 11 having 0 is provided. Thus, by using a reciprocating expander, it can be driven even at a low pressure difference, and the system can be operated even when the sunlight is weak, so that the amount of power generation can be increased. Further, by integrally configuring the expander and the generator, the structure is simplified and the device can be downsized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar thermal power generator that converts sunlight into heat energy to generate power.

[0002]

2. Description of the Related Art Conventionally, as this type of solar thermal power generator,
It was as described in FIG.

In FIG. 9, 1 is a solar heat collector,
The expander 2, the condenser 3 and the boosting means 4 are connected in order to form a closed circuit. The inside of the closed circuit was filled with an evaporative working medium such as CFC refrigerant. The solar heat collector 1 converts sunlight into heat energy to evaporate the working medium to rotate the turbine of the expander 2, and the working medium liquefied in the condenser 3 cooled by the radiator 5 is used as a pump or the like. The pressure boosting means 4 forms a heat cycle in which the working medium is circulated by being pumped to the solar collector 1 and evaporated again.
At this time, the generator 7 connected to the power load 6 can generate power with the rotational force obtained by the expander 2, and the generated power is supplied to the power load 6 for use.

[0004]

However, in the conventional solar thermal power generator, a large pressure difference is required because the axial power generated by using a rotary expander such as a turbine is transmitted to the generator to generate electric power. When the amount is small, there is a problem that the amount of power generation is small and the device becomes complicated and excessive.

The present invention is intended to solve the above-mentioned conventional problems, and an object thereof is to realize a miniaturized solar thermal power generation device which can obtain a large amount of power generation even in a situation where the amount of solar radiation is small and has a simple structure.

[0006]

In order to solve the above-mentioned conventional problems, a solar thermal power generator of the present invention has a solar heat collector for evaporating an evaporative liquid and a magnetic displacer inside. A reciprocating expander with a coil installed in the
The condenser and the pressure increasing means are sequentially connected to form a closed circuit, and the expander is bypassed to provide a bypass pipe having an opening / closing means.

[0007] Thus, since the reciprocating expander is used, it can be driven even with a low pressure difference, and the system can be operated even when the sunlight is weak, so that the amount of power generation can be increased. Further, by integrally forming the expander and the generator, the structure is simplified and the device can be downsized.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is of a reciprocating type in which a solar heat collector for evaporating an evaporative working medium and a displacer of a magnetic material inside and a coil on the outer periphery are arranged. By connecting the expander, the condenser, and the pressure increasing means in order to form a closed circuit, and by providing the expander with the bypass pipe having the opening / closing means, the displacer is reciprocated by the opening / closing operation of the opening / closing means. Since electric power can be generated by reciprocating the magnetic displacer inside the coil provided on the outer circumference, the expander and the generator can be integrated to reduce the size of the device.

According to the second aspect of the present invention, since the bypass pipe branching from the expander and having no opening / closing means is provided, the magnetic displacer can reciprocate without using the opening / closing means. , The displacer can be automatically reciprocated according to the intensity of solar energy, and power generation can be controlled with a simple structure.

According to the third aspect of the present invention, the pipe connecting the condenser and the solar heat collector is provided with the liquid reservoir and the check valve in this order, so that when the high pressure gas is introduced from the bypass pipe. The working medium in the liquid reservoir can be gravity-flowed to the solar collector, and the working medium can be circulated without using a booster such as a pump, so that highly efficient power generation without extra power consumption can be performed. At the same time, the structure of the device can be simplified.

According to a fourth aspect of the present invention, a heat storage tank connected to the condenser by piping, a control device for connecting a coil of the expander and an electric load, and an electric power supply from the control device are supplied to the inside of the heat storage tank. By installing a pump that circulates the heat medium, the exhaust heat of the expander can be collected by the condenser and stored in the heat storage tank, and in addition to the electric energy obtained by power generation, thermal energy can be taken out at the same time. As a result, the solar heat utilization rate can be greatly improved.

According to a fifth aspect of the present invention, the pipe connecting the condenser and the liquid reservoir is provided with a radiator, and when the heat storage tank is full of heat, the radiator is operated to lower the pressure. Let
By increasing the pressure difference and ensuring the operation of the expander, it is possible to reliably generate power when a power load occurs.

According to a sixth aspect of the present invention, an auxiliary electric heater provided in a pipe connected to the heat storage tank, and a pump that circulates the heat medium in the heat storage tank by receiving the electric power generated by the expander and the commercial power source are supplied. By providing a control device for supplying electric power to the auxiliary electric heater, a part of the electric power generated by solar heat is used as the power of the pump, and when there is no electric power load, the auxiliary electric heater is energized to the heat storage tank. On the other hand, when there is no solar radiation, on the other hand, by supplying commercial power to the auxiliary electric heater from the control device to store heat in the heat storage tank, it is possible to realize a highly convenient device that can be used with or without solar radiation. .

According to the invention described in claim 7, since the heat storage tank having the heat exchanger installed therein is provided at the outlet of the expander, the entire apparatus can be integrally configured, and the entire apparatus can be installed on a roof of a house or the like. It is possible to realize a device with excellent workability that can be easily installed.

According to the eighth aspect of the present invention, shock absorbers such as spring materials are attached to both ends of the displacer, so that the shock applied to the container when the displacer reciprocates in the expander can be alleviated. Therefore, it is possible to drive with less noise and vibration.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram of a solar thermal power generator according to a first embodiment of the present invention. In FIG. 1, a solar heat collector 1, an expander 2 having a magnetic displacer 8 inside and a coil 9 outside.
And a condenser 3 having a radiator 5 and a pressure increasing means 4 such as a pump are sequentially connected to form a closed circuit, and an expander 2 is provided with a bypass pipe 11 having an opening / closing valve 10 to evaporate inside the closed circuit. It is configured by being filled with a working fluid.

The operation and action of the solar thermal power generator configured as described above will be described below.

First, the working medium filled in the closed circuit evaporates in the solar heat collector 1 to raise the pressure and push up the displacer 8 in the expander 2. When the displacer 8 comes to the uppermost part, By opening the on-off valve 10 provided in the bypass pipe 11, the high-pressure gas in the solar heat collector 1 is introduced into the upper portion of the expander 2, so that the pressure in the expander 2 becomes uniform, and thus the displacer 8 is It moves downward due to its own weight. On the other hand, when the displacer 8 reaches the lowest point, if the on-off valve 10 provided in the bypass pipe 11 is closed, the upper part of the displacer 8 becomes a low pressure like the pressure in the condenser 3, so the displacer 8 moves upward again. Moving. The working medium condensed in the condenser 3 is pressurized by the pressure increasing means 4 such as a pump and pressure-fed to the solar heat collector 1. Therefore, the on-off valve 10 provided in the bypass pipe 11
The displacer 8 having magnetism reciprocates inside the coil 9 due to the opening and closing action of, so that current can be generated in the coil 9 to generate power.

As described above, in the present embodiment, since the expander and the generator can be integrally formed to generate electric power, the device can be remarkably downsized, and the reciprocating type can be used even when the solar energy is small. Power can be generated by operating the displacer 8 in the expander 2.

(Embodiment 2) FIG. 2 is a block diagram of a solar thermal power generator according to a second embodiment of the present invention.

In FIG. 2, the difference from the configuration of the first embodiment is that the displacer 8 inside the expander 2 is located above the upper end of the displacer 8 and below the displacer 8 above. The point is that a bypass pipe 11 is provided to branch from the portion of the expander 2 below the lower end of the sir 8.

The operation and action of the solar thermal power generator configured as described above will be described below.

First, when the displacer 8 in the expander 2 is below the connecting portion of the bypass pipe 11, the upper part of the displacer 8 leans to the same low pressure as that of the condenser 3, so that the displacer 8 is It is pushed up. On the other hand, when the displacer 8 is pushed up and is above the connection part of the bypass pipe 11, the high-pressure gas in the solar heat collector 1 is introduced from the bypass pipe 11 to the upper part of the displacer 8 and the pressure in the expander 2 is increased. Becomes uniform, the displacer 8 moves downward.

As described above, in this embodiment, the displacer 8 is not required to use the on-off valve and the special control device.
Since it can be reciprocated, it is possible to generate power with a simple configuration.

(Embodiment 3) FIG. 3 is a block diagram of a solar thermal power generator according to a third embodiment of the present invention. In FIG. 3, the difference from the configuration of the second embodiment is that the liquid reservoir 12 and the check valve 1 are connected to the pipe connecting the condenser 3 and the solar heat collector 1.
3 is provided in order.

The operation and action of the solar thermal power generator configured as described above will be described below.

First, the working medium condensed and liquefied in the condenser 3 is stored in the liquid reservoir 12, but when the displacer 8 is below the connecting portion of the bypass pipe 11, the pressure of the solar heat collector 1 is equal to that of the displacer. The liquid reservoir 12 is kept at a low pressure because it is partitioned by the check valve 8 and the check valve 13. However, when the displacer 8 rises above the connection portion of the bypass pipe 11, the high pressure is passed through the bypass pipe 11. Is introduced into the condenser 3 and the liquid reservoir 12, so that the entire system has a uniform pressure, so that the working medium in the liquid reservoir 12 can be sent to the solar heat collector 1 by the action of gravity.

As described above, in this embodiment, since the liquid reservoir 12 and the check valve 13 are used, the working medium can be circulated without using a boosting means such as a pump, so that it is highly efficient. The power can be generated and the device can be downsized.

(Embodiment 4) FIG. 4 is a block diagram of a solar thermal power generator according to a fourth embodiment of the present invention.

In FIG. 4, the difference from the configuration of the third embodiment is that the heat storage tank 14 connected to the condenser 3 by piping and the expander 2 are used.
A controller 15 for connecting the coil 9 and the power load 6;
The point is that a pump 16 that receives power supply from the control device 15 and circulates the heat medium in the heat storage tank 14 is provided.

The operation and action of the solar thermal power generator configured as above will be described below.

The heat medium in the heat storage tank 14 is circulated by the pump 16 to receive heat from the condenser 3 and store it in the heat storage tank 14. At this time, the control device 15 controls so that a part of the electric power generated in the coil 9 of the expander 2 is supplied to the pump 16 and also to the electric power load 6, so that a large amount of electric power is consumed with a small amount of electric power consumption. And you can get heat.

As described above, in this embodiment, by connecting the heat storage tank 14 to the condenser 3, both energy of electricity and heat can be obtained from sunlight at the same time.

(Embodiment 5) FIG. 5 is a block diagram of a solar thermal power generator according to a fifth embodiment of the present invention.

In FIG. 5, the difference from the configuration of the fourth embodiment is that the radiator 17 is connected to the pipe connecting the condenser 3 and the liquid reservoir 12.
This is the point where is provided.

The operation and action of the solar thermal power generator configured as described above will be described below.

In the state where the heat load is small and the heat is sufficiently stored in the heat storage tank 14, the temperature of the condenser 3 rises and the pressure also rises, so that a pressure difference necessary for power generation cannot be obtained.
When power generation is required, the radiator 17 is operated to cool with air or the like to reduce the pressure, so that the power generation operation can be guaranteed.

As described above, in the present embodiment, when there is solar radiation, the power generation operation can be performed regardless of the heat load, so that it is possible to realize the solar thermal power generation device which is excellent in dealing with the power load.

(Embodiment 6) FIG. 6 is a block diagram of a solar thermal power generator according to a sixth embodiment of the present invention. In FIG. 6, the difference from the configuration of the fifth embodiment is that the heat storage tank 14
Auxiliary electric heater 18 provided in a pipe connected to the pump, a pump 16 that circulates a heat medium in the heat storage tank 14 by receiving electric power generated by the expander 2 and electric power from a commercial power source, and the auxiliary electric heater 18
It is the point that the control device 15 for supplying electric power is provided.

The operation and action of the solar thermal power generator configured as described above will be described below.

First, when there is solar radiation, the control device 15 supplies part of the electric power generated by the expander 2 to the pump 16 to collect heat, but even when there is no solar radiation, the control device 15 and the pump 16 assist it. A commercial power source can be supplied to the electric heater 18 to store a predetermined amount of heat in the heat storage tank 14.

As described above, in the present embodiment, a predetermined amount of heat can be secured regardless of the presence or absence of solar radiation, so that it is possible to realize a solar thermal power generation device that is excellent in dealing with heat load.

(Embodiment 7) FIG. 7 is a block diagram of a solar thermal power generator according to a seventh embodiment of the present invention.

In FIG. 7, the difference from the configuration of the sixth embodiment is that the heat storage tank 1 in which a heat exchanger 18 is internally provided at the outlet of the expander 2
4 is the point.

The operation and action of the solar thermal power generator configured as described above will be described below.

The high-temperature gas generated after the power is generated in the expander 2 is condensed and radiated in the heat storage tank 14 in which the heat exchanger 18 is installed and stored in the liquid reservoir 12, so that the displacer 8 is located above the bypass pipe 11. At this time, high pressure is introduced from the bypass pipe 11 to make the entire system uniform, so that the working medium can be circulated by being fed to the solar heat collector 1 by the action of gravity.

As described above, in the present embodiment, since the working medium can be circulated without adding energy such as electric power, highly efficient power generation and heat collection with less energy consumption can be performed, and the entire apparatus can be obtained. It is possible to realize a solar thermal power generation device with excellent workability, such as being able to be integrated and installed on the roof.

(Embodiment 8) FIG. 8 is a block diagram of a solar thermal power generator according to an eighth embodiment of the present invention.

In FIG. 8, the difference from the configuration of the first embodiment is that shock absorbers 19 such as springs are provided at both ends of the displacer 8 in the expander 2.

The operation and action of the solar thermal power generator configured as described above will be described below.

When the displacer 8 reciprocates inside the expander 2, a strong collision with the inner end surface of the expander 2 is repeated, but the shock absorbers 19 provided at both ends of the displacer 8 are provided at the time of this collision. Can absorb shock.

As described above, in this embodiment, the shock absorbing material 19 of the displacer 8 absorbs the shock at the time of collision, so that noise and vibration can be reduced and the durability can be improved.

[0054]

As described above, according to the present invention, since an expander and a generator can be integrally configured to generate electric power, the device can be remarkably miniaturized and can be reciprocated even when the solar energy is small. The displacer 8 in the dynamic expander 2 can be operated to generate electricity, and both energy of electricity and heat can be taken out at the same time, and a highly efficient solar thermal power generator with high solar heat utilization rate can be provided. Can be realized.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a solar thermal power generation system according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a solar thermal power generation system according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a solar thermal power generation system according to a third embodiment of the present invention.

FIG. 4 is a configuration diagram of a solar thermal power generation system according to a fourth embodiment of the present invention.

FIG. 5 is a configuration diagram of a solar thermal power generation system according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram of a solar thermal power generation system according to a sixth embodiment of the present invention.

FIG. 7 is a configuration diagram of a solar thermal power generation system according to a seventh embodiment of the present invention.

FIG. 8 is a configuration diagram of a solar thermal power generation system according to Example 8 of the present invention.

FIG. 9 is a configuration diagram of a conventional solar thermal power generation device.

[Explanation of symbols]

1 solar heat collector 2 expander 3 condenser 4 boosting means 5 radiator 6 power load 8 displacer 9 coils 10 Open / close valve (open / close means) 11 Bypass piping 12 liquid reservoir 13 Check valve 14 Heat storage tank 15 Control device 16 pumps 17 radiator 18 heat exchanger 19 Shock absorber

Claims (8)

[Claims] 1. A solar heat collector for evaporating an evaporative working medium, a reciprocating expander having a magnetic displacer inside and a coil on the outer periphery, a condenser, and a booster. Are connected in sequence to form a closed circuit, and the expander is provided with a bypass pipe having an opening / closing means. 2. A solar heat collector for evaporating an evaporative working medium, a reciprocating expander having a magnetic displacer inside and a coil on the outer periphery, a condenser, and a booster. Are connected in order to form a closed circuit, and a solar thermal power generator equipped with a bypass pipe branched from the expander. 3. A solar heat collector for evaporating an evaporative working medium, a reciprocating expander having a magnetic displacer inside and a coil on the outer circumference, a condenser, and a liquid reservoir. A solar thermal power generator equipped with a bypass pipe branching from the expander to form a closed circuit by sequentially connecting a check valve. 4. A heat storage tank connected by piping to a condenser, a control device for connecting a coil of an expander and an electric load, and a power supply supplied from the control device to circulate a heat medium in the heat storage tank. The solar thermal power generation device according to any one of claims 1 to 3, further comprising a pump. 5. The solar thermal power generation device according to claim 4, wherein a heat radiator is provided in a pipe connecting the condenser and the liquid reservoir. 6. An auxiliary electric heater provided in a pipe connected to the heat storage tank, a pump for circulating the heat medium of the heat storage tank by receiving power supplied from an expander and commercial power, and the auxiliary electric heater. The solar thermal power generator according to claim 4 or 5 provided with the control device which supplies electric power. 7. The solar thermal power generator according to claim 1, wherein a heat storage tank having a heat exchanger therein is provided at the outlet of the expander. 8. The solar thermal power generation device according to claim 1, further comprising a displacer having a shock absorber attached to an end thereof.