JP7175024B2 - geothermal power plant - Google Patents

Description

The present invention relates to a steam-water separator used in a geothermal heat exchanger that exchanges heat using the geotropical zone as a heat source, and a geothermal power generator that generates power using the geothermal heat exchanger that exchanges heat using the geothermal zone as a heat source. It relates to the power generation method.

Conventionally, geothermal power generation equipment extracts natural steam existing in the geotropics using natural pressure and separates it from water. contains a large amount of impurities. This impurity becomes scale and adheres to thermal wells, pipes, turbine blades, and the like. When scale adheres, the amount of power generated decreases over time, making long-term use difficult.

In Patent Document 1, in a binary power generation system, a heat source fluid absorbs heat through heat exchange with a geothermal fluid or geothermal heat, releases heat in an evaporator, and recirculates for heat exchange with the geothermal fluid or geothermal heat. In addition, for the cooling fluid that cools the low boiling point medium, either a closed loop flow path is configured in the ground for heat radiation cooling, or the heat source fluid after passing through the evaporator is used as the driving heat source. A geothermal power generation system has been proposed that comprises a closed loop flow path that controls the temperature of the cooling fluid and supplies the cooling fluid to the condenser so that the condensing of the low boiling point medium in the condenser can be optimized.

JP 2014-84857 A

As described above, in the method of generating power by pumping up and using hot spring water, scale adheres to equipment such as piping equipment and turbines, and the amount of power generated decreases over time, or maintenance is required. In terms of the environment as well, since the hot spring water is pumped up and used, it is conceivable that the amount of discharge of the hot spring water will be affected. In addition, after hot spring water is pumped up and used for power generation, the water is returned to the earth from the return well, but it contains chemical substances for removing scale and has a considerable impact on the environment.
Furthermore, as seen in Patent Document 1, the method of generating power using only underground heat is environmentally friendly and effective because there is no need to consider the amount of hot spring water, chemical substances, and the like.

However, hot water heated underground may not necessarily be hot, depending on the temperature of the geotropics. Therefore, when a high temperature is required, a deep excavation is required, but there is a problem that costs are incurred.
Therefore, in order to effectively use the steam and hot water obtained from the underground without requiring excessive depth, the steam generated from the steam separator is effectively used and the amount of steam from the hot water is increased. There is a need for a technology that satisfies any of the problems of allowing hot water to be effectively transferred to the steam separator.

The present invention has been made in view of such problems, and a steam-water separation device, a geothermal power generation device, and a geothermal power generation method that can effectively utilize the heat obtained from the geotropical zone on the ground and increase the power generation efficiency. intended to provide

In order to achieve the above object, the present invention employs the following means.

A geothermal power generation device that generates power using a medium heated by geothermal heat as a heat source,
a medium transfer pipe provided with a medium injection pipe for transferring the medium to the geothermal heat outside and a medium take-out pipe for taking out the medium heated by the heat of the geothermal heat inside the medium injection pipe;
The medium extraction pipe provided with a heat insulating structure having a low effective thermal conductivity in the low-temperature geotropical zone, and the medium injection pipe provided with an endothermic structure having a high effective thermal conductivity in the high-temperature geotropical zone. When,
The high-temperature medium that has absorbed heat from the geotropical zone is transferred to a heat exchanger on the ground in a liquid state by applying a pressure higher than the evaporation curve so as not to generate steam, and using the medium as a heat source. A binary power generation device that is used in a heat exchanger and vaporizes a working medium having a boiling point lower than that of the medium to generate power;
It is characterized by comprising a reservoir for keeping the water level of the medium, which has been heat-exchanged and cooled by the heat exchanger, constant throughout the system.

Due to the above features, the load on the pressurized water supply pump can be reduced and the water level can be kept constant by effectively utilizing the reservoir as an element for keeping the pressure of the entire system constant.

FIG. 1 is a schematic diagram showing the configuration of the geothermal power generation system of the present invention according to the first embodiment. FIG. 2 is a perspective view showing a ground connection portion of the geothermal power generation system of the present invention according to the first embodiment. FIG. 3 is a perspective view showing the inside of the steam separator of the geothermal power generation system according to the first embodiment of the present invention, cut away. FIG. 4 is a side view showing the interior of the steam separator of the geothermal power generator according to the first embodiment of the present invention, which is cut away to explain how steam and water are separated. FIG. 5 is a perspective view of a separation device incorporated in the steam separator of the present invention according to the first embodiment. FIG. 6 is a perspective view of the separation device showing a state of being attached to the nozzle incorporated in the steam separator of the present invention according to the first embodiment. FIG. 7 is a perspective view showing a hidden line of a separating device attached to a nozzle incorporated in the steam separator of the present invention according to the first embodiment. FIG. 8 is an explanatory view showing how air and water are separated by the separator of the present invention according to the first embodiment. FIG. 9 is a perspective view of a modified example of the separation device of the present invention according to the first embodiment, and is an explanatory diagram showing how air and water are separated. FIG. 10 is an explanatory diagram showing the flow of air and water in the hot water service tank of the present invention according to the first embodiment. FIG. 11 is an explanatory diagram showing the flow of air and water in the hot water service tank in the modification of the hot water service tank of the present invention according to the first embodiment. FIG. 12 is an explanatory diagram showing the flow of air and water in the hot water service tank in the modification of the hot water service tank of the present invention according to the first embodiment. FIG. 13 is a schematic diagram of water state change of the present invention according to the first embodiment. FIG. 14 is a relational diagram showing the relationship between the depth of the medium transfer pipe and the temperature distribution of hot water in the geothermal power generator of the present invention according to the first embodiment. FIG. 15 is a schematic diagram showing the configuration of the geothermal power generator of the present invention according to the second embodiment. FIG. 16 is a schematic diagram showing the configuration of the geothermal power generator of the present invention according to the third embodiment. FIG. 17 is a schematic diagram showing the configuration of the geothermal power generator of the present invention according to the fourth embodiment.

Embodiments of geothermal power generators 1, 100, and 200 according to the present invention will be described in detail with reference to the drawings. It should be noted that the embodiments and drawings described below illustrate a part of the embodiments of the present invention, and are not used for the purpose of limiting to these configurations, and are within the scope of the present invention. can be changed as appropriate. Corresponding components in each figure are labeled with the same or similar reference numerals.

(First embodiment)
A geothermal power generator 1 according to a first embodiment will be described with reference to FIGS. 1 to 14. FIG. FIG. 1 is a schematic diagram showing the configuration of a geothermal power generator 1 of the present invention according to a first embodiment. FIG. 2 is a perspective view showing the ground connection portion 30 of the geothermal power generation device 1 of the present invention according to the first embodiment. FIG. 3 is a perspective view showing the inside by cutting the steam separator F of the geothermal power generator 1 of the present invention according to the first embodiment. FIG. 4 is a side view showing the inside of the steam separator F of the geothermal power generator 1 according to the first embodiment of the present invention, which is an explanatory diagram showing how the steam is separated. FIG. 5 is a perspective view of a separation device 60 incorporated in the steam separator F of the present invention according to the first embodiment. FIG. 6 is a perspective view of the separation device 60 showing the state of being attached to the nozzle 51 incorporated in the steam separator F of the present invention according to the first embodiment. FIG. 7 is a perspective view showing hidden lines of the separation device 60 attached to the nozzle 51 built in the steam separator F of the present invention according to the first embodiment. FIG. 8 is an explanatory diagram showing how air and water are separated by the separator 60 of the present invention according to the first embodiment. FIG. 9 is a perspective view of a modification of the separation device 60 of the present invention according to the first embodiment, and is an explanatory diagram showing how air and water are separated. FIG. 10 is an explanatory diagram showing the flow of air and water in the hot water service tank 4 of the present invention according to the first embodiment. FIG. 11 is an explanatory diagram showing the flow of air and water in the hot water service tank 4a in the modification of the hot water service tank 4 of the present invention according to the first embodiment. FIG. 12 is an explanatory diagram showing the flow of air and water in the hot water service tank 4b in the modification of the hot water service tank 4 of the present invention according to the first embodiment. FIG. 13 is a schematic diagram of water state change of the present invention according to the first embodiment. FIG. 14 is a relational diagram showing the relationship between the depth of the medium transfer pipe 10 and the temperature distribution of hot water in the geothermal power generator 1 of the present invention according to the first embodiment.

The geothermal power generation device 1 mainly includes a pressurized water supply pump 3, a medium transfer pipe 10, a hot water service tank 4, a condensing unit 17, a water supply unit 18, a steam separator F, a steam turbine T, a generator G, and a power receiving facility TF. It consists of
The geothermal power generation device 1 supplies steam V1 to the steam turbine T to rotate the generator G to generate power, supplies electricity to the power receiving equipment TF, and supplies electricity to the electric power company or the like via the power transmission network. ing.
The steam turbine T may be of not only a turbine type but also a screw type or the like as long as it can generate electricity with steam. The steam V1 supplied to the steam turbine T is generated in the steam separator F by boiling the hot water L3 under reduced pressure.

Since the entire amount of hot water L3 supplied to the steam separator F is not converted into steam V1, a large amount of hot water L4, so-called drain, is sent from the steam separator F to the hot water service tank 4. The steam V3 exhausted from the steam turbine T is sent to the condensing unit 17, and the steam V4 sent to the condensing unit 17 is sent to the cooling tower 15 connected to the condenser 6. The sent steam V4 is condensed and returned to water, passes through the condenser 6, is temporarily stored in the condensate tank 14, and is sent to the hot water service tank 4 by the condensate pump 5. - 特許庁

The hot water L8 in the hot water service tank 4 is transferred to the medium transfer pipe 10 as the hot water L1 by the pressurized water supply pump 3 . The hot water L1 transferred by the pressurized water supply pump 3 absorbs heat from the underground heat again in the deep part where the geotropical zone U exists, and is heat-exchanged. The heat-exchanged hot water L2 is transferred by the pressurized water supply pump 3 through a medium transfer pipe 10, which will be described later.

(Medium transfer pipe)
Next, the medium transfer pipe 10 will be described. A medium transfer pipe 10 is buried from the ground surface S to a geotropical zone U serving as a heat source deep underground. A cylindrical medium injection pipe 11 is embedded on the outside of the medium transfer pipe 10, and the circumference of the medium injection pipe 11 extends from the ground surface S to the geotropical zone U, that is, the temperature lower than the temperature required for power generation. The underground area is hardened with geothermal cement, etc., and is applied so that there is no danger of collapse. The medium transfer pipe 10 absorbs heat from the fluid or bedrock of the geotropical zone U located at the deepest part of the medium injection pipe 11 of the medium transfer pipe 10 . The length of the medium transfer pipe 10 varies depending on the temperature of the geotropical zone U, and extends to the geothermal zone that can absorb around 200° C. as heat.

The medium injection pipe 11 is made of a material such as steel or stainless steel. In the area of the geotropical zone U where the temperature is high, the medium injection pipe 11 has a cylindrical fin with a circular cross section welded thereto in order to increase the surface area of the outer periphery and to facilitate the transmission of the heat of the geothermal zone U. In a low-temperature region close to the ground surface S, the medium injection pipe 11 has a heat insulating structure provided with a heat insulating material and an air layer so that the heat of the hot water L1 pressurized and injected from the hot water service tank 4 is not taken away. It is

The medium transfer pipe 10 has a cylindrical medium take-out pipe 12 inside the medium injection pipe 11 for transferring the water heated in the geothermal heat U. The medium take-out pipe 12 is formed in a cylindrical shape coaxially inside the medium injection pipe 11 . The medium take-out pipe 12 has a cylindrical inside through which the hot water L3 can pass, and has a vacuum insulation structure or a structure in which a heat insulating material is attached along the vertical direction on the outside.

The hot water L3 heated in the geotropical zone U is decompressed and boiled in the steam separator F to generate steam. Here, the steam separator F may use a nozzle capable of generating microbubbles or nanobubbles, which are microbubbles by self-priming, when generating steam. With this configuration, the efficiency of steam generation can be improved, and a sufficient amount of steam can be secured even if the speed of water transfer is reduced, so that the residence time of water in the heat absorption region of the geotropical zone U can be increased. This allows the water to take time to absorb the heat, making it a high-temperature hot water.

In this embodiment, water is used as a medium for heat exchange in the geotropical zone U. As a medium, oil, gas (inert gas (nitrogen, carbon dioxide, etc.)) or water used in binary power generation has a boiling point of A medium with a low λ (such as a mixture of water and ammonia) is contemplated. Further, when water or an inert gas is used as a medium, even if the medium transfer pipe 10 is damaged and leaks out to the outside, water or an inert gas will not harm the environment and the working surface will not be affected. can be safely handled even in

(Ground connection)
Next, the ground connection portion 30 that is connected to the medium transfer pipe 10 and protrudes to the ground side will be described with reference to FIG.
The ground connection part 30 is a part that connects the medium transfer pipe 10 buried underground with the steam separator F and the pressurized water supply pump 3 on the ground side. An insulated upper connection pipe 35 provided above the ground connection portion 30 is a connection portion for transferring the hot water L3 to the steam separator F. As shown in FIG. The upper connection pipe 35 communicates with the medium extraction pipe 12 via flanges 36 and 37 .
Also, the air pipe 34 penetrating the flanges 36 and 37 is provided with a valve (not shown) in order to remove the air inside the medium injection pipe 11 . In the work of operating the valve of the air pipe 34 to remove the air, the pressurized water supply pump 3 may cause air entrainment due to the air accumulated in the upper part of the medium injection pipe 11, and the pressurized water supply pump 3 may send hot water L1. It prevents you from not being able to do it.

The medium injection pipe 11 has an injection pipe portion 41 connected to the pressurized water supply pump 3 at the intermediate pipe portion 33, and drain discharge pipes 42 and 43 for discharging the drain. The drain discharge pipes 42 and 43 are pipes for draining water from the intermediate pipe portion 33 in an emergency or when the medium take-out pipe 12 is replaced. During normal operation, a valve (not shown) is closed. .

The ground connection part 30 is a part that connects the medium transfer pipe 10 buried underground with the steam separator F and the pressurized water supply pump 3 on the ground side. The ground connection part 30 is connected to the medium injection pipe 11 inside the underground connection pipe 32 at the lower end and hardened with concrete 31 . The concrete 31 prevents groundwater from blowing up from the outside of the medium injection pipe 11 and maintains strength for supporting the medium transfer pipe 10 .

(steam separator)
Next, the steam separator F that boils the hot water L3 from the upper connection pipe 30 under reduced pressure to generate steam will be described with reference to FIGS. 3 to 8. FIG. The steam separator F is a cylindrical pressure vessel, and a nozzle 51, which is a circular pipe, is provided at a slightly lower position from the middle. The nozzle 51 ejects the hot water L3 from its tip, boils it under reduced pressure in the container, and generates steam. Further, a control valve (not shown) is provided inside or outside the steam separator F for adjusting the pressure (the amount of steam generated).
The nozzle 51 is provided with a separation device 60 fixed by a three-point support shaft 65 inside the tip. A plate-shaped receiving plate 54 is provided below the separation device 60, and a part of the receiving plate 54 is cut out to provide a discharge port 55. As shown in FIG. The receiving plate 54 is gently inclined toward the discharge port 55 and guides the hot water L3.
A hot water service tank pipe 52 is provided below the receiving plate 54 for transferring the so-called drain that has not turned into steam to the hot water service tank 4 .

The separation device 60 is provided to increase the amount of steam. Especially when a sufficient amount of steam from the nozzle 51 can be secured, the separation device 60 may not be attached, but it is the best method for increasing the amount of steam. .
The separation device 60 is formed with a horn portion 61 that widens conically from the nozzle 51 in the blowing direction. Further, four guide pieces 62a, 62b, 62c, 62d are continuously provided along the circumference of the horn portion 61 evenly in the circumferential direction. As shown in FIG. 8, the guiding piece 62 has a continuous piece of constant length with an inclination of about 30 to 60 degrees when viewed from the side and surrounds the circumference of the horn portion 61 . The guide piece 62 mainly spirally turns the hot water L3 along the guide piece 62 .

A tip 66 of the horn portion 61 is provided with a plurality of steam intake holes 68 serving as through holes. Since the steam intake hole 68 allows only a small amount of hot water L3 to pass through, the hot water L3 passes through the outer periphery of the horn portion 61 without entering the inside of the horn portion 61 only slightly.
The horn-like diameter of the separation device 60 is suitably about 1.5 to 3 times the outer diameter of the nozzle 51, and the total length of the separation device 60 may be provided to match the inner diameter of the steam separator F. .

Further, in the horn portion 61 between the guide pieces 62 , a plurality of guide holes 63 serving as through holes are provided along the guide pieces 62 . The guide hole 63 is a hole that guides the steam V1 from the outside of the separator 60 to the inside. Therefore, by providing the guide hole 63, the low-density steam V1 passes through the guide hole 63, but the high-density hot water L3 is difficult to pass through, and is guided by the guide piece 62 and scattered radially. Even if the hot water L3 passes through the guide hole 63, it is expected that the flow velocity will be reduced and it will become droplets, and there is a possibility of further vaporization.

Next, the operation of separating air and water will be described with reference to FIGS. 4 and 8. FIG. The hot water L3 ejected into the steam separator F from the nozzle 51 is boiled under reduced pressure to generate steam V1. The ejected hot water L3 scatters around while spirally turning along the guide piece 62 described above. The steam V1 also swirls in the same manner as the hot water L3, but part of it is guided inside the horn portion 61 through the guide hole 63 and blown forward. Since the blown steam V1 and the swirling steam V1 have a low density, they are transferred to the upper steam extraction pipe 53 .
However, the hot water L3 that did not become the steam V1 drops onto the receiving plate 54 due to gravity. Here, if the hot water L3 becomes steam V1 even while it is flowing to the receiving plate 54, the steam V1 rises and is transferred to the steam extraction pipe 53.
The hot water L4 that has not turned into steam is transferred to the hot water service tank 4 from the discharge port 55 formed with the notch of the receiving plate 54 .

The guide piece 62 of the separation device 60 circulates the hot water L3 to disperse the hot water, gaining time for the hot water L3 to stay in the steam separator F, thereby changing to the steam V1. can be sufficiently obtained. By adopting such a structure in which the hot water L3 can easily stay as much as possible, a large amount of steam can be taken out.
As described above, the separation device 60 of the present invention has a structure for increasing the amount of steam by improving the so-called flash rate and increasing the power generation capacity.

<Modification 1 of the separation device in the steam separator F>
Next, another steam separator Fa will be described with reference to FIG. In addition, the same reference numerals are attached to the same parts as those of the structure or function described above, and the description thereof will be omitted, and the different parts will be described.
The main differences from the above are that the ejection direction of the separating device 60 is upward and that a top plate 86 is provided.

The separator 60 itself is of the same construction as described above, but is oriented upwards to increase the intake of vapor V1 and increase the overall vapor capacity.
A top plate 86 provided above the steam separator Fa is suspended from the ceiling of the steam separator Fa by a support rod 83 .
The top plate 86 is positioned above the separation device 60 and is formed of a conical stainless steel material or the like over the entire upper region so as to cover the steam extraction pipe 53 . A plurality of steam passage holes 87 are provided throughout the top plate 86 by patching to increase the contact area with which the hot water L3 contacts.

The separating device 60 itself has the same effect as described above. By increasing the contact area of the top plate 86, the hot water L3 ejected from the separation device 60 comes into contact with the steam passage hole 87 and other sheet metal when it contacts the top plate 86, and the steam V1 and buy time to change. Therefore, the amount of steam changes depending on whether it is possible to increase the time until the hot water L3 drops into the hot water service tank pipe 52 .
The separation device 60 and the top plate 86 can provide time for the hot water L3 to stay and change to the steam V1. With the structure described above, the hot water L3 can be easily retained as much as possible, so a large amount of steam can be taken out. The separation device 60 and the top plate 86 of the present invention have a structure for increasing the amount of steam by improving the so-called flash rate and increasing the power generation capacity.

(hot water service tank)
Next, the hot water service tank 4 will be described with reference to FIGS. 1 and 10 to 12. FIG. The hot water service tank 4 is a cylindrical pressure vessel. The main pipes connected to the hot water service tank 4 are a pipe for taking in condensate L6 sent from the condensate unit 17, a pipe for taking in degassed water L7 replenished from the water supply unit, and a pressurized water supply pump 3. A pump pipe 76 that sends hot water L8 from the hot water service tank 4, a drain injection pipe 74 that takes in the drain L4 sent from the steam separator F, and a steam discharge that discharges steam V2 generated by pool boiling in the hot water service tank 4. A tube 75 is provided.

As shown in FIG. 10, a partition plate 71 is provided between the drain injection pipe 74 and the steam discharge pipe 75 . The upper end of the partition plate 71a near the drain injection pipe 74 is fixed above the hot water service tank 4, and the lower end of the partition plate 71b near the steam discharge pipe 75 is fixed to the bottom plate of the hot water service tank 4. . The partition plate 71b, which is the partition plate 71 close to the steam discharge pipe 75 and close to the pump pipe 76, is also formed with a through groove 73 as a notch groove for guiding the hot water L8 on the pump pipe 76 side.

The hot water service tank 4 receives the drain L4 sent from the steam separator F as a gas-liquid two-phase flow. In the present invention, a partition plate 71 is provided in the hot water service tank 4, and the hot water L8 that has passed through the liquid interface once through the drain L4 is guided to the pump pipe 76, so that only the hot water L8 that does not contain air bubbles is transferred to the pump pipe. It has a structure that can lead to 76. With the structure as described above, air bubbles are not led to the pump pipe 76, so that the pressurized water supply pump 3 is prevented from cavitation.

Further, the hot water service tank 4 has a structure in which the high-temperature drain L4 becomes steam, and the steam V2 generated in the hot water service tank 4 can be effectively used. The steam is reintroduced to the steam side of the steam separator F via the steam discharge pipe 75 as a bypass. Thus, the hot water service tank 4 also has a structure for effectively increasing the amount of steam and increasing the power generation capacity.

<Modification 1 of hot water service tank>
Next, another hot water service tank 4 will be described with reference to FIG.
In addition, the same reference numerals are attached to the same parts as those of the structure or function described above, and the description thereof will be omitted, and the different parts will be described.
The main difference from the above is that a drain receiving plate 79 is provided. The drain receiving plate 79 is supported by metal supporting legs 81 fixed to the floor plate of the hot water service tank 4 . The drain receiving plate 79 has a structure for temporarily receiving the drain L4 and separating air bubbles and liquid.

In the present invention, the drain receiving plate 79 provided in the hot water service tank 4 temporarily receives the drain L4 and separates the liquid from the air bubbles. It's becoming With the structure as described above, air bubbles are not led to the pump pipe 76, so that the pressurized water supply pump 3 is prevented from cavitation.

<Modification 2 of hot water service tank>
Next, another hot water service tank 4 will be described with reference to FIG. In addition, the same reference numerals are attached to the same parts as those of the structure or function described above, and the description thereof will be omitted, and the different parts will be described.
The main difference from the above is that a drain receiving plate 77 is provided. The drain receiving plate 77 supports a flat metal drain receiving plate 79 with metal support legs 78 fixed to the ceiling of the hot water service tank 4 . The drain receiving plate 77 has a structure for temporarily receiving the drain L4 and separating air bubbles and liquid.

In the present invention, the drain receiving plate 77 provided in the hot water service tank 4 temporarily receives the drain L4 and separates the liquid from the air bubbles. It's becoming With the structure as described above, air bubbles are not led to the pump pipe 76, so that the pressurized water supply pump 3 is prevented from cavitation.

(water supply unit)
Next, the water supply unit 18 will be described with reference to FIG. A water supply unit 18 generates soft water from raw water 16 such as river water or tap water using an industrial soft water generator 9 . The produced soft water is stored in the make-up water tank 8 . A deoxidizer or a deoxidizer is used to remove dissolved oxygen from the stored soft water.

The degassed water L7 from which oxygen has been removed is washed in the medium transfer pipe 10 during the initial operation of the geothermal power generation device 1, and then sent via the hot spring service tank when replaced with water for operation. be done. By removing the oxygen, it is possible to prevent rust and scale formation in the medium transfer pipe 10 . In particular, since the medium transfer pipe 10 has a long overall length, it is possible to reduce the pressure loss by suppressing the scale of the pressurized water supply pump 3, which can lead to energy saving of electric power in the station.

Representative examples of deacidifiers include hydrazine, tannin, products derived directly from plants, and the like. There are also deoxidizers that use inert gases, and inert gases that are less likely to cause chemical reactions are used. Nitrogen, argon, etc., which are less harmful, are used as examples of inert gases. In particular, as in the present invention, it is necessary to control the pressure of the heat-exchanging medium at high temperatures, so deoxidizing agents and deoxidizing devices that do not cause changes in the physical properties of the working fluid are preferred.
Nitrogen and the like are easily dissolved in water by using a microbubble generator, and then the dissolved water is injected to facilitate replacement with oxygen.

During normal operation, the degassed water L7 in the water supply unit 18 is low in temperature, so the water supply unit 18 supplies insufficient water via the condensate unit 18 without directly entering the hot water service tank 4 having a high temperature. It is also possible to cool the condensing unit 18 using the raw water 16 .

(condensing unit)
Next, the condensing unit 17 will be explained. The condensing unit 17 has a function of condensing the steam V3 discharged from the turbine T and returning it to water, and is mainly composed of the condenser 6, the condensing tank 14 and the cooling tower CT. The steam V3 received by the condenser 6 is cooled by the cooling tower CT, condensed, returns to the hot water L10, passes through the condenser 6, and is stored in the condensate tank 14. The stored hot water L6 is sent to the hot water service tank 4 by the condensate pump 5 and stored in the hot water service tank 4 .
Cooling methods using the cooling tower CT include an air-cooling method, a water-cooling method using river water or seawater, and a geothermal heat exchange method in which heat is exchanged underground.

(Power generation method for generating power using the above device)
The power generation method will be explained with reference to FIGS. has reached It is considered that the deeper the depth, the higher temperature can be obtained, but it is determined in consideration of excavation costs. The following values also change appropriately depending on the temperature obtained from the vicinity of the part.

First, the power generation method of the pressurized water power generator 1 will be described. A medium transfer pipe 10 is buried in the ground. reaches deep. In addition, the medium injection pipe 11 reaches the bottom of the medium injection pipe 11 with the medium extraction pipe 12 connected to the inside of the medium injection pipe 11 . These medium transfer pipes 10 are used as a heat exchange section that absorbs the heat obtained from the geothermal heat U. This pressurized water power generator A evaporates hot water to generate power through a steam turbine T. The power generation method by the pressurized water power generator A will be described in detail below.

For example, hot water (L1) in the hot water service tank 4 is pressurized to 5 MPa by the pressurized water supply pump 3 and sent to the medium injection pipe 11 of the medium transfer pipe 10 at a flow rate of 55 (tons)/h (hour). , is transported to the geotropics U deep underground. The hot water transferred to the geothermal heat U at 210°C absorbs heat from the geothermal heat U through the medium injection pipe 11 having a high effective thermal conductivity, and finally becomes hot water (L2) at 200°C. The hot water (L3) taken out from the medium take-out pipe 12 is transferred to the steam separator F at an outlet temperature of 200° C. and a pressure of 2.0 MPa.

The steam separator F releases the pressure of the hot water (L3) at a temperature of 200° C. and boils it under reduced pressure to about 0.6 MPa to generate steam with a flash rate of about 11% and a steam amount of 6 t/h. . The steam separator F sends the generated steam (V1) to the steam turbine T. The generated steam (V1) joins the steam (V2) generated in the hot water service tank 4 in the steam separator F. The merged steam (V1+V2) drives the generator G with the rotation of the steam turbine T to generate electricity. The amount of power generated by this steam (V1+V2) is about 112 kWh when the efficiency is 80%.

In addition, the steam separator F connected to the hot water service tank 4 by piping removes about 89% of the remaining hot water (L4) that has not turned into steam, while maintaining a temperature of around 160°C and a pressure of 0.00°C. It is sent to the hot water service tank 4 at a flow rate of 49 t/h at 6 MPa.
Also, steam (V3) exhausted from the steam turbine T is sent to the condenser 6 . The steam (V4) sent to the condenser 6 is sent to an air-cooled or water-cooled cooling tower 7, condensed by the cooling tower 7, and returned to hot water (L10) of 100° C. and a pressure of 0.101 MPa. The returned hot water (L10) is stored in the condensate tank 14 at a flow rate of 6 t/h. Hot water (L6) in the condensate tank 14 is sent to the hot water service tank 4 by the condensate pump 5 .
Then, the hot water (L1) of about 130° C. in the hot water service tank 4 is again pressurized to 6 MPa by the pressurized water supply pump 3 and sent to the medium injection pipe 11 of the medium transfer pipe 10 at a flow rate of 55 t/h. is transported to the geotropics U.

FIG. 14 is a relation diagram 20 between the depth of the medium transfer pipe 10 of the pressurized water power generator 1 and the temperature distribution of the hot water. A dashed line indicates the underground temperature distribution 21 , and a solid line indicates the temperature distributions of the hot water L1, L2, L3 in the medium injection pipe 11 and the medium extraction pipe 12 .
Bounded by the alternate long and short dash line, the upper heat insulating region 22 uses a pipe with an excellent heat insulating effect that employs a material having an effective thermal conductivity of 0.1 W/m·K or less for the medium injection pipe 11 . In the absorption area 26 below the dashed line, the medium injection pipe 11 is made of a material having an effective thermal conductivity of 50 W/m·K or more and has excellent heat absorption.

In addition, the medium extraction pipe 12 is made of a material having an effective thermal conductivity of 0.1 W/m·K or less regardless of the heat insulation region 22 and the heat absorption region 26, and uses a pipe having an excellent heat insulation effect. Due to the heat insulating effect, the hot water (L2) that has absorbed the heat of the deepest geotropical zone U can be transferred to the steam separator F without being affected by temperature changes in the middle of the medium injection pipe 11 .

FIG. 13 is a schematic diagram of the state change of water. FIG. 13 shows the temperature and pressure when water changes from solid to liquid to gas. A solid line from the triple point to the critical point indicates the evaporation curve 26 . The boiling point at atmospheric pressure is 100°C, indicating 0.101 MPa. At point C on the line, at a temperature of 200° C., if the pressure is less than 1.554 MPa, it is the boundary line where the state of water changes to gas, ie steam.
At point D on the line, when the temperature is 210° C. and the pressure is less than 1.907 MPa, the state of water becomes a boundary line that changes to gas, that is, steam.
A pressurization region 23 indicated by diagonal lines indicates a pressure region in which the hot water L3 does not become steam, and the pressurization water supply pump 3 sets the pressure value in consideration of the pressure loss.

In the temperature distribution 21, the temperature rises and reaches 220° C. as the depth of the geotropical zone U approaches. The effective thermal conductivity of the medium injection pipe 11 and the medium extraction pipe 12 is 50 W/m·K. The temperature distribution 22 rises along.

Here, even if the effective thermal conductivity of the medium extraction pipe 12 is set as small as 0.1 W/m·K, when the pressure of the hot water L3 at the outlet of the medium extraction pipe 12 is lower than point C, the temperature distribution is lower than the evaporation curve 26, steam is generated and the temperature is lowered so as to approach the boiling point.
When water changes to steam in the medium extraction pipe 12, a so-called gas-liquid two-phase flow occurs, and the heat transfer coefficient is several tens of times higher than that of a single-phase water flow. Heat is easily taken away by the low-temperature descending flow L1 flowing through 11 . In order to prevent the heat loss and transport the hot water with the energy stored, it is necessary to make it difficult to cool the hot water.
The hot water having a boiling point or higher heated in the geotropical zone U is conveyed to the steam separator F without steam so as not to cool down, thereby reducing heat loss. In order to reduce heat loss, it is necessary to keep the pressure higher than the evaporation curve 26 of FIG. 13, as described above.

In particular, a temperature difference occurs in the medium transfer pipe 10 serving as a heat exchanger, and buoyancy is generated due to the density difference of water. The pressurized water supply pump 3 does not have enough pressure to transfer the necessary flow rate only by natural circulation due to buoyancy alone, and the pressure loss of the medium injection pipe 11 and the medium extraction pipe 12 must be considered. In addition, it is important that the pressurized water pump 3 keeps the pressure higher than the evaporation curve 26 and keeps the medium transfer pipe 10 from boiling. It is an advantage of the present invention that the underground heat can be effectively used by transferring the hot water L3 that retains the amount of heat absorbed in the geotropical zone U to the steam separator F in a so-called single-phase flow state. .

In view of the above, in the present invention, the heat insulating regions of the medium injection pipe 11 and the medium extraction pipe 12 are made of a material having a heat transfer coefficient of 0.1 W/m·K or less, as indicated by the hatching in FIG. 14 . The best ones are those having a heat insulation performance of 0.05 W/m·K to 0.001 W/m·K. By maintaining the heat insulation performance, the temperature drop at the outlet is prevented, and as a result, there is an advantage that the pressure of the pressurized water supply pump 3 does not need to be set high. In FIG. 14, the dashed line indicates the underground temperature distribution 21 including the geotropical zone U, and the solid line indicates the temperature distribution 25 of the hot water.

Considering the pressure loss in the medium injection pipe 11 and the medium extraction pipe 12, the outlet pressure of the hot water L3 is desirably a pressure range 23 that is at least greater than the evaporation curve 26 in FIG. The pressure was set so as not to generate steam so that hot water above the boiling point can be transferred as it is.
Furthermore, the medium injection pipe 11 was made of a material with a high effective thermal conductivity of 50 W/m·K in the area with a high underground temperature distribution, that is, the heat absorption area required for power generation. The higher the effective thermal conductivity, the better. However, considering the pressure and corrosion in the ground, it is desirable to use a metal material, and the effective thermal conductivity should be 20 W/m K or more. Just do it.

(Second embodiment)
A geothermal power generator 100 according to the second embodiment will be described with reference to FIG. FIG. 15 is a schematic diagram showing the configuration of the geothermal power generator 100 of the present invention according to the second embodiment. The same reference numerals are assigned to the same parts as in the second embodiment, and the above description is omitted.
The binary power generation device B will be described with reference to FIG. 15. The binary power generation device B mainly includes a heat exchange section 150 connected to the pressurized water heat exchanger 1a, a steam turbine T2, a power generator G2, and a power receiving facility TF2. , a cooler 154 and a circulation pump 155 .

In the present invention, the geothermal heat obtained from the medium transfer pipe 10 provided in the pressurized water heat exchanger 1a passes through the heat exchanger 151 as the hot water L3 without being steamed. Since the steam separator F is not provided in this way, it is possible to recover the underground heat with little loss by directly using the underground heat and use it for power generation. The medium M1 evaporates to rotate the steam turbine T2, and the generator G2 generates power.
The power receiving facility TF supplies electricity to an electric power company or the like via a power transmission network. Here, the working mediums M1, M2, and M3 are HFC-245fa, R245fa, etc., which are non-flammable and non-toxic inert inert gases, mediums with low boiling points (mixtures of water and ammonia, etc., hydrocarbons (pentane)), etc. used.

An expansion turbine or the like is used as the steam turbine T2. The working medium M2 that has passed through the steam turbine T2 is cooled by cooling water 157a, 158a of the cooler 156. Also, the working medium M3 is condensed from gas to liquid or the like and sent to the heat exchanger 152 again by the circulation pump 155 .
By piping the cooling water 157a, 158a near the medium transfer pipe 10 of the pressurized water heat exchanger 1a in a shallow region, heat can be exchanged through the ground in the shallow portion of the medium transfer pipe 10. . Therefore, the cooling water 157a, 158a can be cooled without cooling the medium transfer pipe 10. FIG. Thus, effective use of heat can be realized within the same system (geothermal power generation device 100).

By using such a working medium (M1 to M3), even with hot water of 70°C to 95°C, electricity can be generated if there is a flow rate of 9 (ton (ton)) / h (hour) to 24 t / h. becomes possible. In this system, the working medium exchanges heat in a closed system.

In addition, the service tank 4 provided in the pressurized water heat exchanger 1a stores the hot water cooled by the heat exchanger 152. As an element for keeping the pressure of the entire system of the pressurized water heat exchanger 1a constant, It is necessary along with the pressurized water supply pump 3. In particular, when the pressurized water supply pump 3 is stopped due to maintenance, etc., the water capacity of about 2t will increase or decrease within the total system capacity. can control the pressure of the service tank 4 to keep the water level constant.

(Third Embodiment)
A geothermal power generator 200 according to the third embodiment will be described with reference to FIG. FIG. 16 is a schematic diagram showing the configuration of a geothermal power generator 200 of the present invention according to the third embodiment. The same reference numerals are given to the same parts as those in the first embodiment and the second embodiment, and the above description is omitted.
The binary power generator B will be described with reference to FIG. 16. The binary power generator B mainly includes a heat exchange section 150 connected to the pressurized water power generator 1b, a steam turbine T2, a generator G2, a power receiving facility TF2, It is composed of a cooler 154 and a circulation pump 155 .

In the present invention, the hot water L3 obtained from the medium transfer pipe 10 provided in the pressurized water power generator 1b is used to generate steam in the steam separator F, and the drain L4 that has not become steam is passed through the heat exchanger 151. .
The working medium M1 heated in the heat exchange section 150 evaporates to rotate the steam turbine T2, and the rotation causes the generator G2 to generate electricity.
The power receiving facility TF supplies electricity to a power company or the like via a power transmission network. Here, the working medium M may be HFC-245fa, R245fa, etc., which are non-flammable or non-toxic inert gases, or a medium with a low boiling point (a mixture of water and ammonia, etc., hydrocarbon (pentane)), or the like.

An expansion turbine or the like is used as the steam turbine T2. The working medium M2 that has passed through the steam turbine T2 is cooled by cooling water 157a, 158b of the cooler 156. Also, the working medium M3 is condensed from gas to liquid or the like and sent to the heat exchanger 152 again by the circulation pump 155 .
The cooling water 157b, 158b is piped to the raw water 16 provided in the water supply unit 18 of the pressurized water power generator 1b, and heat is exchanged. There is an effective displacement of heat in the system. The raw water 16 can be directly injected into the hot water service tank 4 without going through the condensing unit 17 by being heated.

By using such a working medium (M1 to M3), even with hot water of 70°C to 95°C, electricity can be generated if there is a flow rate of 9 (ton (ton)) / h (hour) to 24 t / h. becomes possible. In this system, heat exchange is performed in a system in which the medium is closed. Since the working medium (M1 to M3) that can be used is determined by the temperature at which heat is exchanged, the binary power generator B may impose a temperature limit. The pressurized water power generator 1b is provided with a temperature control system 161 using the air cooling tower CT of the condensate unit 17 so as to be able to cope with such a case. In particular, when the temperature of the drain L4 that has not turned into steam is high, it is possible to lower the temperature to a range that matches the set temperature of the binary power generator B.

(Fourth embodiment)
A geothermal power generator 300 according to the fourth embodiment will be described with reference to FIG. FIG. 17 is a schematic diagram showing the configuration of a geothermal power generator 300 of the present invention according to the fourth embodiment. The same reference numerals are assigned to the same parts as in the first to third embodiments, and the above description is omitted.
The binary power generator C will be described with reference to FIG. 17. The binary power generator C includes a first heat exchange section 150c, a second heat exchange section 156c connected to the pressurized water power generator 1b, a steam turbine T2, and a steam turbine T3. , a generator G2, a generator G3, a power receiving facility TF2, a cooler 164c, a first circulation pump 155c, and a second circulation pump 165c.

In the present invention, steam is generated from the hot water L3 obtained from the medium transfer pipe 10 provided in the pressurized water power generator 1c in the steam separator F, and the drain L4 that did not become steam is sent to the first heat exchanger 151c. let it pass.
The working medium M1 heated in the first heat exchange section 150c evaporates to rotate the steam turbine T2, thereby generating power by the generator G2.

The power receiving facility TF2 supplies electricity to a power company or the like via a power transmission network. Here, the working medium M (M1 to M23) is HFC-245fa, R245fa, etc., which are inert inert gases that are not flammable or toxic, or media with a low boiling point (a mixture of water and ammonia, etc., hydrocarbon (pentane)), etc. is used. Further, in this embodiment, the working medium (M1 to M3) used in the binary power generator C is a working medium having a high boiling point range and a working medium (M21 to M3) having a boiling point lower than that of the working medium (M1 to M3). By using a working medium having two types of boiling point regions of M23), heat can be utilized in multiple stages, and electric power can be efficiently generated.

Expansion turbines or the like are used as the steam turbines T2 and T3. The working medium M2 that has passed through the steam turbine T2 is heat-exchanged and cooled by the second heat exchanger 153c of the second heat exchange section 154c. Also, the working medium M3 is condensed from gas to liquid or the like and sent to the heat exchanger 152c again by the circulation pump 155c.
Further, in the second heat exchanger 156c in which heat is exchanged by the second heat exchanger 153c of the second heat exchange section 154c, the working medium M21 heated in the second heat exchange section 164c evaporates into a steam turbine. T3 is rotated and power is generated by the generator G3.

The working medium M21 that has passed through the steam turbine T3 is cooled by cooling water 157c, 158c of the cooler 164c. Also, the working medium M23 is condensed from gas to liquid or the like, and sent again to the second heat exchange section 154c by the circulation pump 165c.
The cooling water 157c, 158c is piped to the raw water 16 provided in the water supply unit 18 of the pressurized water power generator 1c to exchange heat, so that the raw water 16 is warmed and the cooling water 157c, 158c is cooled. There is an effective displacement of heat in the system. The raw water 16 can be directly injected into the hot water service tank 4 without going through the condensing unit 17 by being heated.

The method of cooling the working medium or water connected to the heat exchanger or condenser described above is not limited to these, and a method of cooling by a heat exchange method using a Peltier element, etc. Various methods are conceivable.
In addition, in all the embodiments of the present invention, a control valve (not shown) for controlling the pressure of the hot water L or steam V is provided before or after the pressure vessel into which the hot water L or steam V is introduced and discharged to perform pressure control. .

(Other technical features conceivable from the above embodiment)
Examples of technical features of the present embodiment are shown in parentheses below, but they are not particularly limited, but merely illustrative, and the effects conceivable from these features will also be described.
<First feature point>
Steam is generated by boiling a high-temperature and high-pressure medium (for example, mainly hot water (L3)) under reduced pressure, and a steam-water separator (for example, mainly a steam separator F) that separates the steam and the medium. A conical casing (e.g., mainly a horn portion 61) that receives the ejected medium and gradually widens in diameter in the direction of ejection; , a swirling guide portion (for example, mainly a guide piece 62) for swirling the medium.

Due to the above features, the medium spirally swirls, is dispersed, and the medium falls, so that the medium can be dispersed and vaporized. It is possible to increase the amount of steam.

<Second feature point>
The swirl guide section has a plurality of spiral swirl guide pieces (for example, mainly guide pieces 62a, guide pieces 62b, guide pieces 62c, and guide pieces 62d) that are continuous from the tip to the end that receives the ejected medium. characterized by comprising

Due to the above features, the medium spirally swirls, is dispersed, and the medium falls, so that the medium can be dispersed and vaporized. It is possible to increase the amount of steam.

<Third characteristic point>
The housing part is characterized in that it is provided with a plurality of guide holes (for example, mainly guide holes 63) for guiding steam, which are positioned between the plurality of turning guide pieces and are formed with penetrating holes. .
With the features described above, the steam is taken in through the guide holes, and the steam and the medium can be further separated.

<Fourth characteristic point>
A steam extraction pipe (for example, hot water service tank piping 52) for extracting steam is provided in the steam separation device, and a top plate (for example, a main A top plate 86) is provided on the top plate, and the top plate is provided with a plurality of steam guide holes (for example, mainly steam passage holes 87) formed through holes for guiding steam.
Due to the above features, it is possible to secure the time for the medium to vaporize, so it is possible to increase the amount of vapor. Steam can be drawn through the steam directing holes to further separate the steam and the medium.

<Fifth characteristic point>
The steam separator is characterized by comprising a steam generating nozzle for boiling under reduced pressure and generating steam containing microbubbles.
By vaporizing the hot water containing microbubbles and nanobubbles in the steam separator, the amount of steam can be increased by the above characteristics, which can lead to an increase in the amount of power generation.

<Sixth characteristic point>
Geothermal power generation equipment (for example, main to the geothermal power generation device 100, the geothermal power generation device 200, and the geothermal power generation device 300),
A medium injection pipe (for example, mainly a medium injection pipe 11) that transfers the medium to the geotropical zone outside, and a medium extraction pipe (for example, mainly a medium injection pipe 11) that takes out the medium heated by the heat of the geotropical zone inside the medium injection pipe ( a media transfer tube (e.g., primarily media transfer tube 10) comprising, for example, primarily media output tube 12);
The medium extraction pipe provided with a heat insulating structure having a low effective thermal conductivity in the low-temperature geotropical zone, and the medium injection pipe provided with an endothermic structure having a high effective thermal conductivity in the high-temperature geotropical zone. and
The high-temperature medium that has absorbed heat from the geotropical zone is transferred to the above-ground steam separator in a liquid state by applying a pressure higher than the evaporation curve so as not to generate steam, and separating the steam. It is characterized in that steam is generated by boiling under reduced pressure in a vessel, and the steam is used to generate electricity.

Due to the above features, the heat obtained from the ground is converted into heat using water as a medium, so there is no need to consider the effects on equipment such as the temperature drop of heat due to scale and the clogging of pipes. No consideration is given to damage caused by pollution or harmful substances from the ground.
In addition, water droplets in the steam collide with the turbine rotor blades rotating at high speed or the inner wall of the piping, causing erosion, which not only further reduces efficiency but also causes equipment damage.
In the present invention, since steam is generated by a steam separator on the ground (steam separator), the hot water is transferred to the ground with high thermal efficiency compared to the case of generating steam underground, and then boiled under reduced pressure. Since steam is generated, problems such as erosion and efficiency reduction can be solved.

<Seventh characteristic point>
A geothermal power generation method for generating power using a medium heated by geothermal heat as a heat source,
A medium injection pipe (for example, mainly a medium injection pipe 11) that transfers the medium to the geotropical zone outside, and a medium extraction pipe (for example, mainly a medium injection pipe 11) that takes out the medium heated by the heat of the geotropical zone inside the medium injection pipe ( a media transfer tube (e.g., primarily media transfer tube 10) comprising, for example, primarily media output tube 12);
The medium extraction pipe provided with a heat insulating structure having a low effective thermal conductivity in the low-temperature geotropical zone, and the medium injection pipe provided with an endothermic structure having a high effective thermal conductivity in the high-temperature geotropical zone. and
At the beginning of operating the geothermal power generation device, the medium transfer pipe is washed, and an oxygen removing means (for example, mainly a deoxidizer 19 or a deoxidizer) for removing oxygen dissolved in the medium is operated,
After removing the oxygen,
The high-temperature medium that has absorbed heat from the geotropical zone is transferred to a steam separator on the ground in a liquid state by applying a pressure higher than the evaporation curve so as not to generate steam, and then to the steam separator. It is characterized in that steam is generated by boiling under reduced pressure at and the steam is used to generate electricity.

Owing to the features described above, it is possible to prevent rust and scale formation in the medium transfer pipe by removing oxygen. In particular, since the medium transfer pipe has a long overall length, it is possible to reduce the pressure loss by suppressing the scale of the pressurized water supply pump, which can lead to energy saving of the electric power in the station.

<Eighth feature point>
A geothermal power generation device (e.g., mainly a geothermal power generation device 100, a geothermal power generation device 200, and a geothermal power generation device 300) that generates power using a medium heated by geothermal heat as a heat source,
A medium injection pipe (for example, mainly a medium injection pipe 11) that transfers the medium to the geotropical zone outside, and a medium extraction pipe (for example, mainly a medium injection pipe 11) that takes out the medium heated by the heat of the geotropical zone inside the medium injection pipe ( a media transfer tube (e.g., primarily media transfer tube 10) comprising, for example, primarily media output tube 12);
The medium extraction pipe provided with a heat insulating structure having a low effective thermal conductivity in the low-temperature geotropical zone, and the medium injection pipe provided with an endothermic structure having a high effective thermal conductivity in the high-temperature geotropical zone. When,
By applying a pressure higher than the evaporation curve to the high-temperature medium that has absorbed heat from the geotropical zone, it is transferred in a liquid state to a steam-water separator on the ground so as not to generate steam, and is boiled under reduced pressure to steam. The steam separator (for example, mainly the steam separator F) that generates
a storage unit (for example, mainly a hot water service tank 4) for storing the medium that has not become steam in the steam separator;
A pressure pump (for example, mainly a pressure water supply pump 3) that conveys and pressurizes the medium supplied from the storage unit to the geotropical zone,
Inside the storage part, a bubble separation part (for example, mainly a partition plate 71, a drain It is characterized by having receiving plates 77 and 79).

Due to the above features, the structure is such that only the medium containing no air bubbles can be led to the pressurized water supply pump. In this way, since air bubbles are not guided to the pressurized water supply pump, the pressurized water supply pump can be prevented from cavitation.

<Ninth characteristic point>
A geothermal power generation device (e.g., mainly a geothermal power generation device 100, a geothermal power generation device 200, and a geothermal power generation device 300) that generates power using a medium heated by geothermal heat as a heat source,
A medium injection pipe (for example, mainly a medium injection pipe 11) that transfers the medium to the geotropical zone outside, and a medium extraction pipe (for example, mainly a medium injection pipe 11) that takes out the medium heated by the heat of the geotropical zone inside the medium injection pipe ( a media transfer tube (e.g., primarily media transfer tube 10) comprising, for example, primarily media output tube 12);
The medium extraction pipe provided with a heat insulating structure having a low effective thermal conductivity in the low-temperature geotropical zone, and the medium injection pipe provided with an endothermic structure having a high effective thermal conductivity in the high-temperature geotropical zone. When,
A steam separator (e.g., mainly a steam separator F) and the steam separator that generates steam by boiling under reduced pressure;
a storage unit (for example, mainly a hot water service tank 4) for storing the medium that has not become steam in the steam separator;
The reservoir includes a bypass path (e.g., mainly steam discharge pipe 75, steam V2 path) for supplying steam generated from the medium supplied from the steam separator to the steam separator. It is characterized by

Due to the above features, the steam generated in the reservoir can be effectively used, and the structure is for enhancing the power generation capacity.

<Tenth Characteristic Point>
A geothermal power generation device (e.g., mainly a geothermal power generation device 200) that generates power using a medium heated by geothermal heat as a heat source,
A medium injection pipe (for example, mainly a medium injection pipe 11) that transfers the medium to the geotropical zone outside, and a medium extraction pipe (for example, mainly a medium injection pipe 11) that takes out the medium heated by the heat of the geotropical zone inside the medium injection pipe ( a media transfer tube (e.g., primarily media transfer tube 10) comprising, for example, primarily media output tube 12);
The medium extraction pipe provided with a heat insulating structure having a low effective thermal conductivity in the low-temperature geotropical zone, and the medium injection pipe provided with an endothermic structure having a high effective thermal conductivity in the high-temperature geotropical zone. When,
The high-temperature medium that has absorbed heat from the geotropical zone is transferred to a heat exchanger on the ground in a liquid state by applying a pressure higher than the evaporation curve so as not to generate steam, and using the medium as a heat source. A binary power generation device (e.g., mainly a binary power generation device B) that is used in a heat exchanger and vaporizes a working medium having a boiling point lower than that of the medium (e.g., mainly working media M1 to M3) to generate power;
It is characterized by comprising a reservoir (for example), mainly a hot water service tank 4) for keeping the water level of the medium heat-exchanged and cooled by the heat exchanger constant throughout the system.

Due to the above features, the load on the pressurized water supply pump can be reduced and the water level can be kept constant by effectively utilizing the reservoir as an element for keeping the pressure of the entire system constant.

<Eleventh Characteristic Point>
A geothermal power generation device (e.g., mainly geothermal power generation devices 100, 200, 300) that generates power using a medium heated by geothermal heat as a heat source,
A medium injection pipe (for example, mainly a medium injection pipe 11) that transfers the medium to the geotropical zone outside, and a medium extraction pipe (for example, mainly a medium injection pipe 11) that takes out the medium heated by the heat of the geotropical zone inside the medium injection pipe ( a media transfer tube (e.g., primarily media transfer tube 10) comprising, for example, primarily media output tube 12);
The medium extraction pipe provided with a heat insulating structure having a low effective thermal conductivity in the low-temperature geotropical zone, and the medium injection pipe provided with an endothermic structure having a high effective thermal conductivity in the high-temperature geotropical zone. When,
The high-temperature medium that has absorbed heat from the geotropical zone is transferred to a heat exchanger on the ground in a liquid state by applying a pressure higher than the evaporation curve so as not to generate steam, and using the medium as a heat source. a binary power generation device (e.g., mainly a binary power generation device B) that is used in a heat exchanger and vaporizes a working medium having a boiling point lower than that of the medium to generate power,
A working medium pipe that transfers a cooling medium for cooling the working medium is laid in the ground near the medium transfer pipe, and the working medium pipe that exchanges heat with underground heat (for example, mainly cooling water 157a, 158a).
Note that the features 1 to 11 above may be applied to the geothermal power generation method, which is a method invention. Further, the features 1 to 5 above may be a method for separating steam and water, which is a method invention.

Due to the above features, effective utilization of heat can be realized within the same system (for example, mainly in the geothermal power generation device 100).

The present invention is by no means limited to the above-described embodiments, and it goes without saying that various aspects can be implemented as long as they fall within the technical scope of the present invention.

As shown in the above embodiment, it can be used not only in geotropics where hot springs flow, but also in volcanic areas, underwater volcanic areas, and the like.

1, 100, 200, 300 ... geothermal power generation equipment,
3... pressurized water supply pump, 4... hot water service tank,
5... Condensate pump, 6... Condenser,
10... Medium transfer pipe,
11... Medium injection pipe, 12... Medium extraction pipe,
26... Evaporation curve, 60... Separator,
F... Steam separator, 150... Heat exchange part, 151... Heat exchanger,
155... Circulation pump,
T, T1, T2, T3... steam turbine, G... generator,
1a... pressurized water power generator, B... binary power generator, CT... cooling tower,
F... steam separator, TF... power receiving equipment,
S: surface, U: geotropic.

Claims (1)

A geothermal power generation device that generates power using a medium heated by geothermal heat as a heat source,
a medium transfer pipe provided with a medium injection pipe for transferring the medium to the geothermal heat outside and a medium take-out pipe for taking out the medium heated by the heat of the geothermal heat inside the medium injection pipe;
The medium extraction pipe provided with a heat insulating structure having a low effective thermal conductivity in the low-temperature geotropical zone, and the medium injection pipe provided with an endothermic structure having a high effective thermal conductivity in the high-temperature geotropical zone. When,
Applying a pressure higher than the evaporation curve to the high-temperature medium that has absorbed heat from the geotropical zone,
It is transferred to a heat exchanger on the ground in a liquid state so as not to generate steam, the medium is used as a heat source in the heat exchanger, and the working medium having a boiling point lower than that of the medium is vaporized to generate power. a binary power generator;
a reservoir for keeping the water level of the medium heat-exchanged and cooled by the heat exchanger constant throughout the system;
The heat exchanger for circulating and heat-exchanging the medium that has absorbed heat in the geotropical zone in a closed system, and an oxygen removal device for removing oxygen contained in the medium used in the heat exchanger. wherein dissolved oxygen is removed from soft water produced by a soft water generator by said oxygen remover, and said water is used as said medium for replenishment in a closed system.

Images