TW202040050A - Heat medium transport pipe, method of installing the heat medium tranport pipe, geothermal power generation system and method by means of the heat medium transport pipe - Google Patents

Abstract

This invention aims to provide a heat medium transport pipe that, for the purpose of effectively utilizing on the ground, by means of heat medium, the heat obtained from a geotherm girdle, enhances the heat-retention capability of the heat medium transport pipe for transporting the heat medium. Also provided are a geotherm power generation system and a geotherm power generation method utilizing the heat medium transport pipe. Disclosed in this invention is a heat medium transport pipe 10 (medium filling pipe 50, heat medium takeoff pipe 80) for transporting the medium (mainly, for example, water and oil etc.) in the ground and recovering the medium that absorbs the heat in the ground. The heat medium transport pipe is characterized by comprising pipe joints 51/55 that connect plural said heat medium transport pipes, and heat medium heat-retention pipes 60/90 that continuously coat, within the heat medium transport pipe, the pipe joints and part of the heat medium transport pipe so as to achieve heat-retention of the heat held by the medium.

Description

Heat medium conveying pipe, construction method of heat medium conveying pipe, geothermal power generation system and geothermal power generation method using the heat medium conveying pipe

The present invention relates to a heat transfer pipe that uses the geothermal zone as a heat source and uses a medium to recover heat. When the heat medium is transported, the ability to heat the heat is improved, and the heat transfer pipe is used to generate electricity. System and method of geothermal power generation.

In the past, geothermal power generation systems used a method to extract natural steam existing in the geothermal zone under natural pressure and separate the gas from water. Therefore, the extracted steam contains a lot of sulfur and other impurities unique to the geothermal zone. These impurities become scales and adhere to hot wells, pipes, or blades of turbines. Once the scale adheres, the amount of power generation decreases over time, making it difficult to use for a long time.

Patent Document 1 proposes a geothermal power generation system. In a two-cycle power generation system, the structure absorbs heat by heat exchange between a heat source fluid and a geothermal fluid or geothermal heat, dissipates heat by an evaporator, and returns it again for heat exchange with the geothermal fluid or geothermal heat. Closed loop circulation flow path, and constitutes a closed loop flow path that also performs heat dissipation and cooling underground for the cooling fluid that cools the low boiling point medium, or constitutes a refrigerator and a heat exchanger that use the heat source fluid after passing through the evaporator as the driving heat source, It controls the temperature of the cooling fluid and implements the cooling fluid supply to the condenser to optimize the condensing and liquefaction of the low-boiling point medium in the condenser.

Patent Document 2 discloses a general pipe threaded joint used in a heat transfer pipe for efficiently recovering heat medium. It is composed of a pin bolt and a cap nut, each of which has a threaded portion and a non-threaded metal contact portion. The contact surface of the non-threaded metal contact part is provided with a close contact surface and a shoulder end surface. The shoulder end surface of the pin bolt is located at the end surface of the front end of the pin bolt. Between the close contact surface and the shoulder end surface, there is a pin bolt and a cap nut that do not contact each other In the non-contact area, the shoulder end surface of at least one of the pin bolt and the cap nut has at least one groove communicating with the non-contact area and the inside of the threaded joint. [Literary Technical Literature] [Patent Literature]

Patent Document 1: Japanese Patent Application Publication No. 2014-84857 Patent Document 2: Japanese Special Publication No. 2014-535023

[Problems to be solved by the present invention]

As mentioned above, in the power generation method that extracts hot spring water and uses it, scale adheres to geothermal wells and production wells, and further adheres to equipment such as piping equipment and turbines, and the amount of power generation decreases over time. In addition, regular maintenance for removing scale must be carried out. In terms of the environment, because the hot spring water is extracted for use, it must also be considered to affect the amount of hot spring water, etc. In addition, although the hot spring water is extracted and used for power generation and returned to the ground from the Motoi, it contains chemicals for removing scale, which has a considerable impact on the environment. In addition, as can be seen from Patent Document 1, the method of generating electricity using only underground heat is environmentally friendly, and there is no need to worry about the amount of hot spring water, chemical substances, etc., so it is an effective method.

In addition, in order to recover heat underground and transport the obtained hot water to the ground, a heat transfer pipe is required. Although the heat transfer pipe also depends on the temperature of the geothermal zone, it must have a length of 1000m to 3000m; The conveying pipe is connected by pipe threaded joints, and the heat medium conveying pipe extends to the deep underground. As can be seen from Patent Document 2, there is a strong demand for the compression resistance and sealing performance of the pipe threaded joint under internal and external pressures to be firmly joined to the pipe.

However, the threaded joints of the pipe fittings have not adopted a structure for improving the heat preservation performance. Heat transfer occurs inside and outside the pipe at the temperature close to the surface, and the heat recovered from the ground is taken away. In addition, not only the threaded joints of pipe fittings, but also the conveying pipe that requires heat preservation, if the diameter becomes larger, it is difficult to form a heat preservation structure due to the balance with the strength, which is technically difficult. In addition, due to the installation of a thermal insulation structure, there is also a need to improve the operability of the installation in a way that does not damage the thermal insulation performance. Therefore, in order to effectively use the heat medium obtained from the ground, it is necessary to take into account the operational performance and transport the heat medium to the separator or heat exchanger located on the ground in a way that does not take the heat of the heat medium during the transportation of the heat medium. .

In view of the above-mentioned problems, the object of the present invention is to provide a heat transfer pipe that can improve the heat preservation ability of the heat transfer pipe for conveying the medium in order to effectively use the heat obtained from the geothermal zone by the medium on the ground, and use the heat transfer pipe. Geothermal power generation system and geothermal power generation method of heat medium conveying pipe. [Technical means to solve the problem]

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

A heat medium conveying pipe that conveys media underground and recovers the medium that absorbs heat underground. The heat medium conveying pipe is characterized by comprising: a pipe fitting connecting a plurality of heat medium conveying pipes; and heat medium heat preservation The pipe continuously covers the pipe fitting joint and a part of the heat medium conveying pipe inside the heat medium conveying pipe to keep the heat possessed by the medium.

With the above structure, the present invention not only improves the heat preservation performance of the heat medium conveying pipe by the heat preservation pipe, but also facilitates the replacement of the heat medium heat preservation pipe itself and the installation of the heat medium conveying pipe.

With reference to the drawings, the embodiments of the geothermal power generation system 1, 100, 200, 300, 400 of the present invention will be described in detail. In addition, the embodiments and drawings described below only illustrate a part of the embodiments of the present invention, and are not intended to be limited to the structure thereof, and can be appropriately changed without departing from the gist of the present invention. The same or similar symbols are given to corresponding components in each figure.

(First Embodiment) With reference to Fig. 1, a geothermal power generation system 1 of the first embodiment will be described. Fig. 1 is a schematic diagram showing the configuration of the geothermal power generation system 1 of the present invention in the first embodiment.

Geothermal power generation system 1, mainly composed of pressurized water supply pump 3, heat medium delivery pipe 10, warm water storage tank 4, condensing unit 17, water supply unit 18, gas-water separator F, steam turbine T, generator G, and power receiving The equipment TF constitutes. The geothermal power generation system 1 exchanges heat with water as a medium supplied to the deepest part of the ground through the media injection pipe 50 by the pressurized water supply pump 3, pressurizes the water as hot water, and sends it to the ground through the heat medium extraction pipe 80 delivery. The delivered hot water L3 is decompressed and boiled by the pressure regulating valve PV1, and delivered to the gas-water separator F. The steam and hot water are separated in the gas-water separator F, and the steam V1 generated is supplied to the steam turbine T.

The geothermal power generation system 1 supplies the generated steam V1 to the steam turbine T, rotates the generator G to generate power, supplies power to the power receiving device TF, and supplies power to power companies and the like through the power transmission network. The steam turbine T can be not only in the form of a turbine, but also in the form of a propeller, etc., as long as it can generate electricity from steam. The steam V1 supplied to the steam turbine T is decompressed and boiled the hot water L3 and separated into hot water and steam by the gas-water separator F.

The hot water L3 supplied to the gas-water separator F has not all become steam V1, so a large amount of hot water L4, that is, drain water, is sent from the gas-water separator F to the warm water storage tank 4. In addition, the steam V3 discharged 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 CT connected to the condenser 6. The delivered vapor V4 is condensed and returned to water, and is first accumulated in the condensation tank 14 through the condenser 6, and then sent to the warm water storage tank 4 by the condensation pump 5.

The warm water L8 in the warm water storage tank 4 is delivered to the heat medium delivery pipe 10 as the warm water L1 by the pressurized water supply pump 3. The warm water L1 delivered by the pressurized water supply pump 3 absorbs heat from the underground heat in a certain depth of the geothermal zone U again to exchange heat. The hot water L2 that has undergone heat exchange is delivered by the pressurized water supply pump 3 through the heat medium delivery pipe 10 described later.

(Heat transfer pipe) Next, referring to Figs. 2 to 10, the heat medium transport pipe 10 will be described. Fig. 2 is a partial perspective view showing the heat medium conveying pipe 10 of the present invention in the first embodiment. FIG. 3 is a partial perspective view showing the disassembly of the medium injection tube 50 of the present invention in the first embodiment. Fig. 4 is a partial longitudinal sectional view of the medium injection pipe 50 of the present invention in the first embodiment. Fig. 5 is a perspective view of the thermal insulation pipe 60 of the present invention in the first embodiment. Fig. 6 is a partial longitudinal sectional view of the medium injection pipe 50 of the present invention in the first embodiment. Fig. 7 is a partial longitudinal section of the heat medium transport pipe 10 of the present invention in the first embodiment. Fig. 8 is a partial longitudinal sectional view of the heat medium extraction pipe 80 of the present invention in the first embodiment. Fig. 9 is a schematic diagram of the phase transition of water of the present invention in the first embodiment. Fig. 10 is a graph showing the relationship between the depth of the heat transfer pipe 10 and the temperature distribution of hot water in the geothermal power generation system 1 of the present invention in the first embodiment.

As shown in Fig. 10, a heat medium transport pipe 10 is buried from the ground surface S to the heat source U located deep underground. The heat transfer pipe 10 has a cylindrical media injection pipe 50 buried on its outer side, and the media is injected around the pipe 50. The area from the surface S to the geothermal zone U is consolidated by geothermal cement, which is more necessary for power generation The temperature is lower in the region, so that it does not have the risk of collapse. The heat transfer pipe 10 absorbs the heat of the fluid or rock disk from the geothermal zone U located at the deepest part of the media injection pipe 50 of the heat transfer pipe 10. The length of the heat medium conveying pipe 10 changes its total length according to the temperature of the geothermal zone U, and extends to the geothermal zone U that can heat the flowing heat medium to about 200°C.

The media injection pipe 50 is formed of materials such as steel or stainless steel. In the region of the geothermal belt U where the temperature is high, the medium injection pipe 50 has a cylindrical fin with a circular cross section in order to increase the surface area of the outer periphery and facilitate heat transfer of the geothermal belt U. The medium injection pipe 50 adopts an insulating structure described later in the low temperature area close to the ground surface S so as not to take the heat of the hot water L1 injected from the hot water storage tank 4 under pressure.

In the heat medium delivery pipe 10, a cylindrical heat medium take-out pipe 80 is provided inside the medium injection pipe 50, and the heat medium take-out pipe 80 transports water heated by the geothermal belt U. The heat medium take-out pipe 80 is cylindrically formed on the inner side of the medium injection pipe 50 and coaxially. The heat medium take-out tube 80 has a cylindrical shape through which hot water L3 can pass through the inside of the tube, and a vacuum insulation structure or a structure in which a heat insulation material is attached to the outside along the vertical direction.

Further, referring to FIGS. 2 to 11, the heat medium delivery pipe 10 will be described in detail. The heat medium delivery pipe 10 is composed of a medium injection pipe 50 and a heat medium extraction pipe 80. First, referring to Figs. 2 to 7, the medium injection pipe 50 will be described. 2 is a perspective view of the media injection pipe 50 with the heat insulation material 70 removed. The media injection pipe 50 is composed of the injection pipe 40, the pipe fitting screw joint 51, the heat insulation pipe 60 shown in FIG. 5, and the heat insulation material 70. The media injection pipe 50 is connected to the injection pipe 40 by the pipe threaded joint 51 to form a long tube to the deepest part of the geothermal zone U.

As shown in Figures 2 to 7, the injection tube 40 has a heat-resistant polyethylene, polypropylene, nylon 6, nylon 66, foamed polyurethane, fluororesin, etc. on the outermost surface except for the gripping portion 47. The coating layer 46. As shown in FIGS. 4 and 6, the injection pipe 40 is provided with an external thread portion 42 in which a thread groove is formed on the outer surface of both ends having a slightly tapered shape. In addition, the internal thread part 52 and the external thread part 42 are shown with diagonal lines in the figure of FIG. 4, FIG. 6, and FIG. The gripping portion 47 is provided to hold the media injection tube 50 in a state where the media injection tube 50 itself is held in a state where the metal is exposed and does not constitute the coating layer 46 when the pipe threaded joint 51 is torque controlled and locked. This is because if the covering layer 46 is provided, there is a concern that it will hinder the gripping force.

Next, the pipe threaded joint 51 shown in FIG. 3, FIG. 4, FIG. 6 and FIG. 7 includes an internal thread portion 52, and the internal thread portion 52 has a thread groove formed on the inner side to be fitted with the external thread portion 42. The pipe threaded joint 51 is provided with a mounting space portion 53 as a space to be fitted with a protruding portion 62 described later, and a space in which the external thread portion 42 is not formed in the center of the interior.

Next, the thermal insulation tube 60 shown in FIGS. 3 to 7 includes an insertion tube 61. The insertion tube 61 is a heat-resistant polyimide, polyimide, and polyimide with a total length of about 1200 mm and formed into a tube. It is made of resin such as nylon 66, PEEK, polyamide or fluororesin. In addition, in the center of the insertion tube 61, a ring-shaped protrusion 62 is joined by ultrasonic welding or the like. The inner diameter of the protrusion 62 is the same as the outer diameter of the insertion tube 61 and is formed of the same resin. Thereby, the insertion tube 61 and the protrusion 62 are integrally formed. In addition, it is not limited to welding, and the thermal insulation pipe 60 may be integrally formed by a mold forming method. The longitudinal length of the insulating tube 60 is formed to a part of the covering layer 46, and naturally also formed in the holding portion 47, which is designed considering the influence of the heat transfer received from the outside of the pipe threaded joint 51 and the injection tube 40.

The outer diameter of the protruding portion 62 is larger than the inner diameter of the injection pipe 40, so the protruding portion 62 can be left in the placement space 53 so that the heat-insulating pipe 60 does not fall into the interior of the injection pipe 40. In addition, the outer diameter of the insertion tube 61 is smaller than the inner diameter of the injection tube 40, so the insertion tube 61 enters the inside of the injection tube 40. With the above structure, the media injection pipe 50 is connected by screwing the pipe fitting screw joint 51, inserting the insertion pipe 61 of the insulation pipe 60 into the injection pipe 40, and screwing the other injection pipe 40 from above. Connect tightly to the pipe threaded joint 51.

In this way, the connection of the medium injection pipe 50 is completed with a simple operation. In addition, not only the heat preservation performance of the media injection pipe 50 is improved by the heat preservation pipe 60, the replacement of the heat preservation pipe 60 itself and the installation of the media injection pipe 50 are also easy. In addition, the protruding portion 62 is formed so that the hot water does not boil by applying pressure by the pressurized water supply pump 3, and the protruding portion 62 is held between the injection pipes 40 even if the hot water is pressure-fed. Therefore, the insulating tube 60 does not fall off. In addition, since the two ends of the insulating pipe 60 are held between the injection pipe 40, it does not fall off in the vertical direction. In addition, regarding the heat medium extraction pipe 80 described later, the heat-insulating pipe 90 does not fall off in the vertical direction in the same manner.

Next, referring to FIG. 4, the insulating material 70 provided around the medium injection pipe 50 will be described. The heat insulating material 70 is in close contact with the periphery of the media injection pipe 50, and is provided with a heat insulating layer 72 formed of a material such as glass wool, and a protective film portion 71 formed of a metal film such as alumina on the outermost periphery. The medium injection pipe 50 has a heat-insulating structure with a heat-insulating material 70 and a coating layer 46 on the outer side of the pipe.

Next, referring to FIGS. 7 and 8, the heat medium extraction pipe 80 will be described. The heat medium take-out pipe 80 is installed in a steam power generation facility to recover heat from deep underground with hot water, transport it to the ground, and generate steam. The heat medium take-out pipe 80, referring to FIGS. 2 to 6, the description of the parts having the same structure as the medium injection pipe 50 is omitted, and the different parts are described. The heat medium take-out pipe 80 is located inside the medium injection pipe 50, and is composed of the take-out pipe 81, the pipe fitting threaded joint 55, and the heat preservation pipe 90.

The take-out pipe 81 corresponds to the structure of the injection pipe 40; the pipe threaded joint 55 corresponds to the structure of the pipe threaded joint 51; the mounting space portion 57 corresponds to the structure of the mounting space portion 53; the external thread portion 82 corresponds to the external The structure of the threaded portion 42; the internal threaded portion 56 corresponds to the structure of the internal threaded portion 52; the insulation pipe 90 corresponds to the structure of the insulation pipe 60; the covering layer 86 corresponds to the structure of the covering layer 46; the holding portion 87 corresponds to The structure of the holding portion 47; the protrusion 92, which corresponds to the structure of the protrusion 62. In the heat medium extraction pipe 80, a heat insulating portion 85 is provided along the longitudinal direction, and an air layer that becomes a space or a heat insulating layer in which a heat insulating material is embedded is formed inside the heat insulating portion 85. The heat medium take-out pipe 80 is configured with an insulating structure by the heat-insulating pipe 90 to prevent heat transfer.

In this way, the connection of the heat medium extraction pipe 80 is completed by a simple operation similar to the above-mentioned medium injection pipe 50. In addition, not only the heat preservation performance of the heat medium extraction tube 80 is improved by the heat preservation tube 90, but the replacement of the heat preservation tube 90 itself and the installation of the heat medium extraction tube 80 are also easy. In addition, the heat medium take-out pipe 80, like the medium injection pipe 50, has a good heat preservation state by the heat preservation pipe 60 and the heat insulation structure, and the heat preservation state is improved by the heat preservation pipe 90, the heat insulation portion 85 and the coating layer 86, so that the heat preservation state can be improved without seizure. The hot water L3 is taken out from the ground in a hot way.

Next, the experimental data showing the thermal insulation performance of the present invention are presented. Fig. 11(A) is a diagram showing a conventional media injection pipe 101. Fig. 11(B) is a diagram showing the medium injection pipe 50 of the present invention. FIG. 11(C) is a result of experimental data showing the thermal insulation performance of the conventional media injection pipe 101 and the media injection pipe 50 of the present invention. The applicant of this case, as shown in FIG. 11, in order to compare the thermal insulation performance of the media injection tube 50 of the present invention and the conventional media injection tube 101, the temperature of each point (P1 to P8) was measured as a schematic diagram to obtain the temperature gradient. Insert the heater into the inside of the pipes (101, 50) on both sides, fill the inside with water heated by the heater, and fill the outside of the pipe with water at room temperature. Compared with the media injection pipe 101, the media injection pipe 50 is additionally provided with an insulating pipe 60 and a coating layer 46.

The measured temperature gradient is shown in Figure 11(C). The distance between P1 and P2 of the conventional media injection pipe 101 becomes 890°C/m, and the distance between P5 and P6 of the media injection pipe 50 of the present invention shows 3980°C/m; It is shown that the media injection pipe 50 of the present invention has a larger temperature difference than the conventional media injection pipe 101, and it can be confirmed that the heat insulation pipe 60 improves the thermal insulation performance. In addition, the distance between P3 and P4 of the conventional media injection pipe 101 becomes 3420°C/m, and the area between P7 and P8 of the media injection pipe 50 of the present invention shows 9790°C/m; it is shown that the media injection pipe 50 of the present invention has a better The larger temperature difference of the media injection pipe 101 can confirm that the coating layer 46 improves the thermal insulation performance. Through the above-mentioned method, the present invention can have the heat transfer pipe 10 with improved thermal insulation performance.

The hot water L3 heated by the geothermal zone U is decompressed and boiled by the pressure regulating valve PV1 to generate steam. Here, the gas-water separator F is connected to the pressure regulating valve PV1, and the nozzle for generating steam can also be a nozzle that can generate microbubbles or nanobubbles as microbubbles by self-priming. With this structure, the efficiency of steam generation can be improved. Therefore, even if the speed of conveying water is reduced, a sufficient amount of steam can be ensured. Therefore, the residence time of a lot of water in the heat-absorbing area of the geothermal zone U can be obtained. It can become hot water with high temperature.

As another modification example for improving the thermal insulation performance, referring to FIG. 23, another embodiment of the heat medium extraction pipe 80 will be described. Fig. 23 is a longitudinal sectional view showing a heat medium extraction pipe 80a according to a modification of the first embodiment. In addition, the same symbols are given to the same parts as in the above-mentioned embodiment, and the above description is omitted. The heat medium take-out pipe 80a is installed in order to recover the deep underground heat with hot water and transport it to the ground. The pressure regulating valve PV1 (Figure 1) generates steam and uses the heat to generate electricity from the steam. The heat medium take-out pipe 80a is located inside the medium injection pipe 50, and is composed of the take-out pipe 81a, the pipe fitting screw joint 55, and the heat preservation pipe 91.

The pipe 81a is taken out, and screw grooves are provided on the outer periphery of both ends. In addition, the pipe threaded joint 55 is provided with a thread groove on the inner periphery so as to be fitted into the thread groove of the take-out pipe 81a. The take-out pipe 81a can be extended by fitting the take-out pipes 81 to each other with a pipe fitting screw joint 55 to be connected.

In addition, as shown in Figure 23, the insulation tube 91 formed of resin such as polyimide, polyimide amide, nylon 66, PEEK, polyamide or fluororesin, etc., is placed in the center of the pipe fitting threaded joint 55 and taken out The pipe 81a is divided near the middle to cover the entire length of the extraction pipe 81a. In this way, the heat medium take-out pipe 80a is covered with the heat-insulating pipe 91 not only partly but covers the entire length of the take-out pipe 81a. Even if the take-out pipe 81a is not provided with an insulating structure such as an air layer or a heat insulating material, it can still be inexpensive The ground keeps the heat medium in good condition and transports the heat medium to the ground.

Insulation pipe 91, in the center of the insulation pipes 91a, 91b, the annular protrusions 92a, 92b are joined by ultrasonic welding, etc. The inner diameter of the protrusions 92a, 92b is the same as the outer diameter of the insulation pipes 91a, 91b , Formed with the same resin. Thereby, the thermal insulation pipe 91a, 91b and the protrusion 92a, 92b are integrally formed. In addition, it is not limited to welding, and the thermal insulation pipe 91 may be integrally formed by a mold forming method.

The outer diameters of the protrusions 92a, 92b are larger than the inner diameter of the take-out tube 81a, so it is possible to leave the protrusions 92a, 92b in the placement space 53 so that the heat-insulating tube 91 does not fall into the inside of the take-out tube 81a. . In addition, the outer diameter of the insertion part of the heat-insulating pipe 91 is smaller than the inner diameter of the take-out pipe 81a, so the heat-insulating pipe 91 enters the inside of the take-out pipe 81a. With the above structure, the extraction pipe 81a is connected by screwing the pipe fitting thread joint 55, and then inserting the insulation pipe 91 into the extraction pipe 81a, and screwing the other extraction pipe 81a to the pipe fitting thread joint from above 55 and connected.

In this way, the connection operation of the heat medium extraction pipe 80a is completed with a simple operation. In addition, the protrusions 92a and 92b are formed such that the pressurized water supply pump 3 applies pressure so as not to generate steam, and the protrusions 92a and 92b are held between the extraction pipe 81a even if hot water is pressure-fed. Therefore, the insulating tube 91 does not fall off. As described above, the insulating pipe 91 holds both ends between the take-out pipe 81a, so it does not fall off in the vertical direction.

In addition, as shown in FIG. 23, the part of the pipe threaded joint 55 is provided with an insulating structure to prevent heat transfer by providing a pipe threaded joint covering portion 93 after the extraction pipe 81a is connected by the pipe threaded joint 51. The pipe threaded joint coating 93 is coated with a tubular resin such as polyolefin resin or polypropylene resin that shrinks when heated, or a tape such as polyolefin resin or polypropylene resin. With the above structure, the heat medium is taken out of the pipe 80a, and the heat transfer of the pipe threaded joint 55 is blocked by the pipe threaded joint cover 93.

Although water is used as the medium for heat exchange in the tropical zone U in this embodiment, as the medium, consider oil, gas (inert gas (nitrogen, carbon dioxide, etc.)) or a medium with a lower boiling point than water used in dual-cycle power generation ( Mixture of water and ammonia, etc.). In addition, in the case of using water or inert gas as the medium, even if the heat transfer pipe 10 is damaged and the medium flows out to the outside, if it is water or inert gas, it does not harm the environment and is safe on the work surface.地处理。 Ground processing.

(Gas-water separator) The gas-water separator F shown in Fig. 1 becomes a cylindrical pressure vessel. The nozzles installed in the gas-water separator F spray hot water L3 from the front end to separate steam V1 and hot water L4 in the vessel. In addition, a pressure regulating valve PV1 for regulating pressure (steam generation) is installed anywhere inside or outside the gas-water separator F. In addition, a pressure regulating valve PV2 is installed in the passage to the warm water storage tank 4 of the recovered discharged water L4 to adjust the steam pressure from the gas-water separator F to the steam turbine T, and the amount of steam from the gas-water separator F to the steam turbine T It can also be used in control.

(Warm water storage tank) Next, referring to Fig. 1, the warm water storage tank 4 will be described. The warm water storage tank 4 becomes a cylindrical pressure vessel. The main piping connected to the warm water storage tank 4 is provided with the piping for obtaining the condensate water L6 sent from the condensing unit 17, the piping for obtaining the deaerated water L7 supplied from the water supply unit, and the piping connected to the pressurized water supply pump 3 and The pump piping for the water storage tank 4 to transport warm water L8, the discharge water injection pipe to obtain the discharge water L4 sent from the gas-water separator F, and the steam V2 generated by the pool boiling in the warm water storage tank 4 Steam exhaust pipe.

(Water supply unit) The 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. Then, the generated soft water is stored in the make-up water tank 8. The stored soft water removes dissolved oxygen by using a deoxidizer or deoxidizer.

During the initial operation of the geothermal power generation system 1, the deaerated water L7 from which oxygen has been removed is delivered through the warm water storage tank 4 when the heat medium delivery pipe 10 is cleaned and replaced with water for operation. By removing oxygen, the generation of rust and scale in the heat transfer pipe 10 can be suppressed. In particular, because the total length of the heat medium delivery pipe 10 is long, if the suppression of the scale generation on the inner wall is performed covering the entire length of the delivery pipe, the pressure loss can be reduced and the power in the place can be energy-saving.

In addition, representative examples of deoxidizers include hydrazine, tannin, and various plant-derived products. In addition, there are also deoxidizers that use inert gases, which use inert gases that are not prone to chemical reactions. In the example of the inert gas, nitrogen or argon which is less harmful is used. In particular, as in the present invention, the heat exchange medium must be pressure controlled at a high temperature, so it is preferably a deoxidizer or deoxidizer that does not change the physical properties of the actuating fluid. After simply dissolving nitrogen and the like in water using the microbubble generator, it becomes easy to replace with oxygen by injecting the nitrogen-dissolved water.

During normal operation, the water supply unit 18 does not directly enter the warm water storage tank 4 with a high temperature due to the low temperature of the deaerated water L7, and supplies insufficient water via the condensation unit 17. In addition, when the condensing unit 17 is cooled, the raw water 16 may be used for cooling.

(Condensing unit) Next, the condensation unit 17 will be described. The condensing unit 17 has a function of condensing the steam V3 discharged from the steam turbine T and returning it to water, and is mainly composed of a condenser 6, a condensing tank 14, and a cooling tower CT. The vapor V3 received by the condenser 6 is cooled in the cooling tower CT, condensed and returned to the warm water L10, and stored in the condenser 14 via the condenser 6. The stored warm water L6 is sent to the warm water storage tank 4 by the condensate pump 5 and stored in the warm water storage tank 4. In addition, the cooling method performed by the cooling tower CT includes an air-cooling type, a water-cooling type using river water or sea water, or an underground heat displacement type using heat exchange underground.

(Power generation method using the above system to generate power) With reference to Figure 1, Figure 9 and Figure 10, the power generation method will be described. In order to obtain steam with a temperature of about 200°C on the ground, the depth of the hole drilled by the drill reaches the depth of about 700m to 2000m to 3000m underground. Although it is believed that the deeper the depth, the higher the temperature can be obtained, but it still depends on the balance with the excavation cost. The geothermal zone U is best if the temperature is between 200℃ and 300℃. The following values also follow the ground The temperature obtained near the deepest part of the tropical U is appropriately changed.

First, the power generation method of the geothermal power generation system 1 will be described. The heat medium transport pipe 10 is buried underground, and the heat medium transport pipe 10 is connected to the medium injection pipe 50 to reach the deep underground. In addition, the media injection pipe 50 is connected to the heat medium extraction pipe 80 inside the media injection pipe 50 and reaches the bottom of the media injection pipe 50. These heat transfer pipes 10 are used as heat exchange parts that absorb heat obtained from the geothermal zone U. This geothermal power generation system 1 evaporates hot water to generate electricity by the steam turbine T. The power generation method performed by the geothermal power generation system 1 will be described in detail below.

For example, the warm water (L1) in the warm water storage tank 4 is pressurized to 5 MPa by the pressurizing water supply pump 3, and sent to the medium injection pipe 50 of the heat medium delivery pipe 10 at a flow rate of 55 t/h, and delivered to the deep underground The geotropical U. The warm water transported to the tropical zone U at 210°C absorbs the heat from the tropical zone U from the medium injection pipe 50 with a high effective heat transfer coefficient, and finally becomes 200°C hot water (L2). Then, the hot water (L3) taken out from the heat medium take-out pipe 80 has a temperature of 200° C. at the outlet, and is sent to the gas-water separator F by setting the pressure to 2.0 MPa.

The gas-water separator F releases the hot water (L3) with a temperature of 200°C through the pressure regulating valve PV1, boils at a reduced pressure of about 0.6MPa, and separates it into a steam volume of 6t/h generated at a flash rate of about 11%. Of steam. The gas-water separator F sends the generated steam (V1) to the steam turbine T. The generated steam (V1) and the steam (V2) generated in the warm water storage tank 4 merge in the gas-water separator F. The combined steam (V1+V2) drives the generator G by the rotation of the steam turbine T to generate electricity. With this steam (V1+V2) power generation, if the efficiency is 80%, an output of about 112kWh can be obtained.

In addition, the gas-water separator F connected to the warm water storage tank 4 by piping keeps about 89% of the hot water (L4) left behind without becoming steam at a temperature of about 160°C, and the pressure is lower than 0.6MPa. The flow of 49t/h is sent to the warm water storage tank 4.

In addition, the steam (V3) discharged from the steam turbine T is sent to the condenser 6. The vapor (V4) sent to the condenser 6 is sent to an air-cooled or water-cooled cooling tower CT, and is condensed by the cooling tower CT, and returned to 100°C warm water (L10) with a pressure of 0.101MPa. The returned warm water (L10) is stored in the condensate tank 14 at a flow rate of 6t/h. In addition, the warm water (L6) of the condensation tank 14 is sent to the warm water storage tank 4 by the condensation pump 5. Then, the warm water (L1) of about 130°C in the warm water storage tank 4 is pressurized again by the pressurizing water supply pump 3 to 6 MPa, and sent to the media injection pipe 50 of the heat transfer pipe 10 at a flow rate of 55t/h. Transported to the geotropic U deep underground.

FIG. 10 is a diagram showing the relationship between the depth of the heat transfer pipe 10 of the geothermal power generation system 1 and the temperature distribution of hot water. The dotted line shows the temperature distribution 21 of the ground; the solid line shows the temperature distribution 25 of the hot water L1, L2, L3 of the medium injection pipe 50 and the heat medium extraction pipe 80. With the one-point chain line as the boundary, the upper thermal insulation area 22 and the media injection pipe 50 use pipes with excellent thermal insulation effect, and are made of materials with an effective thermal conductivity of 0.1W/m·K or less. In addition, with the one-point chain line as the boundary, the lower heat-absorbing area 26 and the media injection pipe 50 are made of pipes with excellent heat absorption, and they are made of materials with an effective thermal conductivity of 50W/m·K or more.

In addition, the heat medium take-out pipe 80 uses pipes with excellent heat insulation effect in both the heat-insulating area 22 and the heat-absorbing area 26, and is made of a material with an effective thermal conductivity coefficient of 0.1 W/m·K or less. Due to the thermal insulation effect, the hot water (L2) that absorbs the heat of the deepest tropical zone U can be delivered to the pressure regulating valve PV1 without being affected by the temperature change on the way of the media injection pipe 50.

Figure 9 is a schematic diagram of the phase transition of water. Figure 9 shows the temperature and pressure of water when it transforms into solid, liquid, and gas. The solid line from the triple point to the critical point represents the evaporation curve 27. The boiling point under atmospheric pressure is 100°C, indicating 0.101 MPa. Point C on the line, when the temperature is 200°C, becomes the boundary line that changes from the state of water to gas when the pressure is lower than 1.554 MPa, that is, the boundary line that changes to vapor.

Point D on the line, when the temperature is 210°C, becomes the boundary line that changes from the state of water to gas when the pressure is lower than 1.907 MPa, that is, the boundary line that changes to vapor. In addition, the pressurization range 23 indicated by diagonal lines shows that the hot water L3 does not become the range of steam pressure; the pressurized water supply pump 3 sets the pressure value in consideration of pressure loss.

The temperature distribution 21 increases as it approaches the depths of the geothermal zone U, reaching 220°C. Since the medium injection pipe 50 and the heat medium take-out pipe 80 are made of materials with an effective thermal conductivity of 50W/m·K, the warm water (L1) of the medium injection pipe 50 is introduced, and the temperature distribution 25 rises along the temperature distribution 21 of the ground .

Here, even if the effective heat transfer coefficient of the heat medium take-out pipe 80 is set to a small coefficient of 0.1W/m·K, the pressure of the hot water L3 at the outlet of the heat medium take-out pipe 80 is lower than the point C, the temperature distribution It becomes lower than the evaporation curve 27, so vapor is generated, and the temperature decreases and approaches the boiling point.

When the heat transfer pipe 80 changes from water to steam, it becomes a so-called gas-liquid two-phase flow. Compared with the single-phase flow of hot water, the heat transfer rate is dozens of times, so it is easy to be circulated in the heat. The medium take-out pipe 80 or the medium injection pipe 50 is composed of warm water L1 in the low-temperature sedimentation flow to capture heat. In order to prevent this heat loss and maintain energy-retained transportation, it is necessary to make the hot water difficult to cool. In addition, the hot water above the boiling point heated in the geothermal zone U is transported to the gas-water separator F without cooling, thereby reducing heat loss. In order to reduce heat loss, it is necessary to maintain a higher pressure than the evaporation curve 27 of FIG. 9 as described above.

In particular, a temperature difference is generated in the heat medium transfer pipe 10 that becomes a heat exchanger, and with this, buoyancy is generated due to the density difference of water. If the pressurized water supply pump 3 only uses natural circulation with only buoyancy, the pressure required for the delivery flow is insufficient, and the pressure loss of the medium injection pipe 50 and the heat medium extraction pipe 80 must be considered.

In addition, in order to maintain a higher pressure than the evaporation curve 27 for the pressurized water supply pump 3, it is important to maintain the pressure at a high pressure by the pressurized water supply pump 3 so that the heat medium does not boil in the heat medium delivery pipe 10. status. The advantage of the present invention is that the hot water L3, which retains the heat absorbed in the geothermal zone U, is sent to the pressure regulating valve PV1 in a state of so-called single-phase flow, and the underground heat can be effectively used.

By the above method, the present invention, as shown in the meshed part of FIG. 10, the heat-insulating area of the medium injection pipe 50 and the heat medium take-out pipe 80 is formed of a material with an effective thermal conductivity of 0.1 W/m·K or less. The best material is the one with thermal insulation performance ranging from 0.05W/m·K to 0.001W/m·K. By maintaining the thermal insulation performance, the temperature at the outlet is prevented from lowering, and as a result, it has the advantages that the pressure of the pressurized water supply pump 3 is not set to a high pressure. In FIG. 10, the dotted line shows the temperature distribution 21 of the ground including the geotropical zone U, and the solid line shows the temperature distribution 25 of the hot water.

In addition, the outlet pressure of the hot water L3, considering the pressure loss of the medium injection pipe 50 and the heat medium extraction pipe 80, should be pressurized by the pressurizing water supply pump 3 at least to a higher pressure range 23 than the evaporation curve 27 of FIG. Make it a pressure that does not generate steam so that it can be transported in a way that maintains the temperature of hot water above the boiling point.

Furthermore, in the area where the temperature distribution of the ground is high, that is, the heat absorption area required for power generation, the medium injection pipe 50 is formed of a material with a high effective thermal conductivity of 50 W/m·K. In particular, the higher the effective thermal conductivity, the better. However, considering the pressure and corrosion in the ground, it should be made of metal materials, and the effective thermal conductivity should be 20W/m·K or more.

(Second Embodiment) 12, the geothermal power generation system 200 of the second embodiment will be described. Fig. 12 is a schematic diagram showing the configuration of the geothermal power generation system 200 of the present invention in the second embodiment. In addition, the same reference numerals are given to the same parts as in the first embodiment, and the above description is omitted. 12, the dual-cycle power generation device B will be described. The dual-cycle power generation device B is mainly composed of the following components: a heat exchange unit 150 connected to the pressurized water power generation device 1b, a steam turbine T2, a generator G2, a power receiving device TF2 The cooler 154 and the circulation pump 155 are constituted.

In the present invention, the hot water L3 obtained from the heat transfer pipe 10 installed in the pressurized water power generation device 1b is separated from the steam by the gas-water separator F, and the discharged water L4 that has not become steam is first stored in the storage tank 161 . In addition, the steam V3 obtained from the steam turbine T is returned to hot water by the condenser 6 and stored in the storage tank 161. The hot water L4 accumulated in the storage tank 161 is supplied to the heat exchanger 151 of the two-cycle power generation device B.

The actuating medium M1 heated by this part of the heat exchange part 150 is evaporated, the steam turbine T2 is rotated, and the generator G2 generates electricity by this rotation. The power receiving device TF2 supplies power, and supplies power to a power company or the like through the power transmission network. The actuating medium M1 here uses HFC-245fa, R245fa, etc., which are inert gases that are not flammable or toxic, or a medium with a low boiling point (a mixture of water and ammonia, etc., hydrocarbon (n-pentane)).

Steam turbine T2 uses expansion turbines and the like. The actuation medium M2 of the steam turbine T2 is cooled by the cooling water 157a of the cooler 156. In addition, the actuating medium M3 is condensed from gas to liquid, etc., and sent to the heat exchanger 152 by the circulation pump 155 again.

The pipeline of the cooling water 157a is arranged in the raw water 16 of the water supply unit 18 of the pressurized water power generation device 1b to exchange heat, thereby heating the raw water 16 and cooling the cooling water 157a. Therefore, it is in the geothermal power generation system 200 Effectively replace heat in the entire system. By heating the raw water 16, it is possible to directly put into the warm water storage tank 4 without passing through the condensation unit 17.

By using these actuating media (M1 to M3), even if it is 70°C to 95°C warm water, if there is a flow rate of 9t/h to 24t/h, electricity can be generated. In this system, it becomes a system in which the media performs heat exchange in a closed system.

The actuating medium (M1 to M3) is determined by the medium that can be used according to the temperature of the heat exchange, so there are cases where the temperature limit is set according to the double-cycle power generation device B. The pressurized water power generation device 1b is provided with a temperature adjustment system 162 using the cooling tower CT of the condensing unit 17 in a manner that can respond to this situation. In particular, when the temperature of the discharged water L4 that has not become steam is high, the temperature can be lowered to a range suitable for the set temperature of the two-cycle power generation device B.

Alternatively, the hot water L3 sent from the heat transfer pipe 10 can be directly supplied to the heat exchanger 151, and the temperature of the geothermal well in the deepest part of the geothermal zone U can be generated by the double-cycle power generation device B. If it is low, the underground thermal power can be used efficiently.

(The third embodiment) Referring to Fig. 13, a geothermal power generation system 300 of the third embodiment will be described. FIG. 13 is a schematic diagram showing the configuration of the geothermal power generation system 300 of the present invention in the third embodiment. In addition, the same reference numerals are given to the same parts as in the first embodiment and the second embodiment, and the above description is omitted. The dual-cycle power generation device C will be described with reference to FIG. 13. The dual-cycle power generation device C is composed of the following elements: a first heat exchange unit 150c, a second heat exchange unit 154c, a steam turbine T2, and steam connected to a pressurized water power generation device 1c Turbine T3, generator G2, generator G3, power receiving equipment TF2, cooler 164c, first circulation pump 155c, and second circulation pump 165c.

In the present invention, the hot water L3 obtained from the heat transfer pipe 10 provided in the pressurized water power generation device 1c is separated from the steam by the gas-water separator F, and the discharged water L4 that has not become steam passes through the first heat exchanger 151c . The actuating medium M1 heated by this part of the first heat exchange part 150c is evaporated, the steam turbine T2 is rotated, and the generator G2 generates electricity.

The power receiving device TF2 supplies power, and supplies power to a power company or the like through the power transmission network. The actuating medium M (M1 to M23) here uses inert gas HFC-245fa, R245fa, etc., which are not flammable or toxic, or a medium with a low boiling point (a mixture of water and ammonia, etc., hydrocarbon (n-pentane)), etc. . In addition, in this embodiment, the two-cycle power generation device C uses two types of actuation media with boiling point ranges: an actuation medium with a high boiling point range (M1 to M3), and a boiling point that is higher than that of the actuation medium (M1 to M3). Low actuation medium (M21 to M23), heat can be used in multiple stages, and electricity can be generated efficiently.

Steam turbines T2 and T3 use expansion turbines and the like. The operating medium M2 passing through the steam turbine T2 is cooled by the heat exchange performed by the first heat exchanger 153c of the second heat exchange part 154c. In addition, the actuating medium M3 is condensed from gas to liquid, etc., and sent to the heat exchanger 152c by the circulating pump 155c. In addition, the second heat exchanger 156c of the second heat exchange part 154c performs heat exchange, evaporates the operating medium M21 heated by the second heat exchange part 156c, rotates the steam turbine T3, and generates electricity by the generator G3.

The operating medium M22 passing through the steam turbine T3 is cooled by the cooling water 157c of the cooler 164c. In addition, the actuating medium M23 is condensed from gas to liquid, etc., and sent to the second heat exchange unit 154c by the circulation pump 165c. The pipeline of the cooling water 157c is arranged in the raw water 16 of the water supply unit 18 of the pressurized water power generation device 1c to exchange heat, so that the raw water 16 is heated and the cooling water 157c is cooled, so it is in the geothermal power generation system 300 Effectively replace heat in the entire system. By heating the raw water 16, it is possible to directly put into the warm water storage tank 4 without passing through the condensation unit 17.

In addition, the method of cooling the above-mentioned operating medium or water connected to the heat exchanger and condenser does not have to be limited to the above-mentioned method. Various methods such as cooling by using the heat exchange method of the Peltier element are also considered. Kind of method.

(Fourth Embodiment) Referring to Fig. 14, a geothermal power generation system 100 according to the fourth embodiment will be described. Fig. 14 is a schematic diagram showing the configuration of the geothermal power generation system 100 of the present invention in the fourth embodiment. In addition, the same reference numerals are given to the same parts as in the first embodiment to the third embodiment, and the above description is omitted. Referring to Figure 14, the dual-cycle power generation device B will be described. The dual-cycle power generation device B is mainly composed of the following components: a heat exchange unit 150 connected to the pressurized water heat exchange device 1a, a steam turbine T2, a generator G2, and a power receiving device TF2, cooler 154, and circulating pump 155.

In the geothermal power generation system 100, the pressurized hot water L3 from the media conveying pipe 10 provided in the pressurized water heat exchange device 1a does not become steam, but maintains the hot water through the heat exchanger 151. The geothermal power generation system 100 does not have a gas-water separator F, so it uses hot water to absorb underground heat and use it directly, thereby reducing loss, and recovering underground heat to help power generation.

The actuating medium M1 heated by this part of the heat exchange part 150 is evaporated, the steam turbine T2 is rotated, and the generator G2 generates electricity. The power receiving device TF22 supplies power, and supplies power to a power company or the like through the power transmission network. The actuating media M1, M2, and M3 here use inert gases such as HFC-245fa, R245fa, etc., which are not flammable or toxic, or media with a low boiling point (a mixture of water and ammonia, etc., hydrocarbons (n-pentane)).

Steam turbine T2 uses expansion turbines and the like. The operating medium M2 passing through the steam turbine T2 is cooled by the cooling water 157a of the cooler 154. In addition, the actuating medium M3 is condensed from gas to liquid, etc., and sent to the heat exchanger 152 by the circulation pump 155 again.

The geothermal power generation system 100, by using these actuating media (M1 to M3), can generate electricity with a flow rate of 9 t/h to 24 t/h even with warm water at 70°C to 95°C. In this system, it becomes a system in which the actuating medium performs heat exchange in a closed system.

In addition, the warm water storage tank 4 provided in the pressurized water heat exchange device 1a stores hot water cooled in the heat exchanger 151, and serves as a function for keeping the pressure of the entire system of the pressurized water heat exchange device 1a constant. The element of pressure is the same as that of the pressurized water supply pump 3. In particular, when the pressurized water supply pump 3 is stopped due to maintenance, etc., the pressurized water heat exchange device 1a produces fluctuations in the water capacity of about 2t within the total system capacity, so it is necessary to keep the water level constant. Restarting operation smoothly, the pressure of the warm water storage tank 4 can be controlled to keep the water level constant.

(Fifth Embodiment) 15 to FIG. 20, the construction method of the heat medium transport pipe 500 and the heat medium transport pipe 500 of the fifth embodiment will be described. Fig. 15 is a partially omitted longitudinal sectional view of the heat medium transport pipe 500 of the present invention in the fifth embodiment. Fig. 16 is a longitudinal sectional view in the middle of construction of the heat medium delivery pipe 500 of the present invention in the fifth embodiment. Fig. 17 is a longitudinal sectional view in the middle of construction of the heat medium transport pipe 500 of the present invention of the fifth embodiment. Fig. 18 is a schematic view showing a part of the pipe threaded joint 51 of the heat transfer pipe 500 of the present invention in the fifth embodiment enlarged. Fig. 19 is a partially omitted longitudinal sectional view of a heat medium transport pipe 500 according to a modification of the present invention of the fifth embodiment. 20 is a diagram showing the relationship between the depth of the heat medium delivery pipe 500 and the temperature distribution of hot water in the geothermal power generation system of the present invention in the fifth embodiment. In addition, the same reference numerals are given to the same parts as in the first embodiment to the fourth embodiment, and the above description is omitted.

Fig. 15 shows an example in which the heat medium conveying pipe 500 is arranged from the ground surface S to the geothermal zone U to a depth of 3000m at the deepest part. The heat medium delivery pipe 500 has the heat medium extraction pipe 80 provided at the center thereof, and the medium injection pipe 50, the first protection pipe 31, the second protection pipe 32, and the third protection pipe 33 are provided on the outer periphery thereof. The first protection pipe 31 to the third protection pipe are formed by extending the annular pipe toward the geothermal belt U.

As shown in FIG. 20, it is shown that the heat medium delivery pipe 500 is applied to the geothermal power generation system 1 or the pressurized water heat exchange device 1a, pressurized water power generation devices 1b, 1c used in the first embodiment to the fourth embodiment (FIG. 1 , And Figure 12 to Figure 14), the relationship between the depth of the heat transfer pipe 500 and the temperature distribution of hot water. The broken line shows the temperature distribution 21 of the ground, and the solid line shows the temperature distribution 25 of the hot water L1, L2, L3 in the medium injection pipe 50 and the heat medium extraction pipe 80.

With the one-point chain line as the boundary, the upper thermal insulation area 22 and the media injection pipe 50 use pipes with excellent thermal insulation effect, and are made of materials with an effective thermal conductivity of 0.1W/m·K or less. In addition, with the one-point chain line as the boundary, the lower heat-absorbing area 26 and the media injection pipe 50 are made of pipes with excellent heat absorption, and they are made of materials with an effective thermal conductivity of 50W/m·K or more.

In addition, the heat medium take-out pipe 80 uses pipes with excellent heat insulation effect in both the heat-insulating area 22 and the heat-absorbing area 26, and is made of a material with an effective thermal conductivity coefficient of 0.1 W/m·K or less. Due to the thermal insulation effect, the hot water (L2) that absorbs the heat of the tropical zone U in the deepest part is not affected by the temperature change on the way of the medium injection pipe 50, for example, is sent to the pressure regulating valve PV1 in FIG.

The first protection tube 31 to the third protection tube 33 are located in the heat-insulating area 22, and are each provided with a heat-insulating structure. The side walls are consolidated by geothermal cement, and the excavator is used to continue digging deep underground. The first protection pipe 31 to the third protection pipe 33 prevent the side walls from collapsing during excavation. As shown in FIGS. 15 and 18, the first protection tube 31 is provided with a convection shielding disk 73 (convection shielding means) under the threaded joint 51 of the pipe fittings connecting the injection pipes 40 of the medium injection pipe 50, which is in the shape of a disc. It shields the convection from the hot water 74 upwards and prevents blowout during construction. The convection shielding disk 73 has an inner diameter smaller than the outer diameter of the threaded joint 51 of the pipe fittings, and the structure does not escape upward due to the water pressure of the groundwater.

The convection shielding plate 73 further improves the heat preservation performance of the media injection pipe 50 by preventing the following situation: the hot water penetrating into the gap between the media injection pipe 50 and the first protection pipe 31 from below and the lower temperature Groundwater is convectively mixed and becomes low-temperature water. Therefore, the heat medium delivery pipe 500 can further improve the heat preservation performance by arranging the convection shielding disk 73 at a plurality of positions in the vertical direction. In addition, the convection shielding disk 73 is not limited to materials such as metal, resin, rubber, etc., and may be a structure in which a paving cloth or the like is provided around the media injection pipe 50.

Next, the heat medium transport pipe 500 is provided with an insulating structure constructed by the construction method described later between the first protection pipe 31 and the second protection pipe 32, and between the second protection pipe 32 and the third protection pipe 33. The heat transfer pipe 500 uses lightweight aggregates such as expanded polystyrene between the first protection pipe 31 and the second protection pipe 32, and between the second protection pipe 32 and the third protection pipe 33, or Concrete mixed with or generated a lot of bubbles, so-called foamed concrete 36, 37, makes it a thermal insulation structure with cushioning, thermal insulation, and non-water absorption. Between the first protection tube 31 and the second protection tube 32, and between the second protection tube 32 and the third protection tube 33, sealing parts 34 and 35 enclosed by concrete materials are provided below.

The sealing parts 34 and 35 prevent the penetration of water lower than the warm water circulating in the medium injection pipe 50 from below, and improve the thermal insulation performance of the heat medium delivery pipe 500. In addition, the upper part of the heat transfer pipe 500 is also sealed with concrete or steel material not shown to prevent the penetration of water from above.

Next, referring to FIG. 15 to FIG. 17, the construction method of the heat medium delivery pipe 500 of the present invention will be described. First, excavate to 700m with the largest diameter by the excavating machine. In such a way that it does not collapse during digging, continuous excavation is made with geothermal cement etc. while consolidating the side walls. When it reaches 700m, as shown in Fig. 16, a closed section 35 filled with concrete material with a depth of 10m to 100m is formed. The third protection tube 33 described above is buried.

Next, as shown in FIG. 15 and FIG. 17, the diameter of the excavator is reduced, and the excavation is carried out to a size such that the second protective tube 32 can be buried, and the excavation is continued to 1500 m. When it reaches 700m, as shown in FIG. 17, in the lower full diameter and depth of 10m-100m, the closed part 34 is formed with concrete material, and the said 2nd protection pipe 32 is buried. Next, as shown in FIG. 15, the diameter of the excavator is further reduced, and the excavation is carried out to a size such that the first protective tube 31 can be buried, and the excavation is continued to a position of about 1700m in the insulation area 22, and the above-mentioned first Protection tube 31.

Finally, as shown in Fig. 15, the diameter of the excavator is further reduced, and the excavation is carried out to the extent that the medium injection pipe 50 can be buried, and the excavation continues to the tropical zone where the desired temperature of the heat absorption area 26 is 210°C. The above-mentioned medium injection pipe 50 and heat medium extraction pipe 80 are buried at a position of about 3000m.

Here, the heat absorption area 26 is not limited to the area where hot water must exist sufficiently, and the rock disk zone 38 or the fracture zone 43 is also considered. After the excavation reaches the deepest part of the geothermal zone U, as shown in Fig. 15, the heat absorption area 26 is the rock disk zone 38. In order to make the media injection pipe 50 and the geothermal zone U a good heat transfer, the rock disk zone 38 and The medium injection pipe 50 is filled with water as the transfer promoting medium 39. Although water can be injected later, it can also be a method of directly retaining and using the water used during hydraulic fracturing or mud digging.

In addition, the heat medium delivery pipe 500, as shown in FIG. 19, in the case where the heat absorption area 26 is the rupture zone 43, there is a gap between the rupture zones and does not have hot water, so it can be placed between the medium injection pipe 50 and the rupture zone 43. A metal cup-shaped connecting pipe 75 is inserted in between, for receiving water as a transfer promoting medium 39. In addition, in order to improve the heat conduction between the medium injection pipe 50 and the geothermal zone U, water is filled between the connection pipe 75 and the medium injection pipe 50 as the transfer promotion medium 39. In addition, the transfer promoting medium 39 may be not only water, but also a liquid resin containing metal for easy heat transfer.

As mentioned above, in the present invention, even if the geothermal zone U of the heat absorption area 26 is a rock band 38 or a rupture zone 43 with poor heat transfer, the medium can still be interposed between the heat transfer pipe 500 and the geothermal zone U with good efficiency. The ground absorbs the heat of the tropical U.

In addition, the nozzle 75 shown in FIG. 24 is provided with a medium moving hole 76 as a through hole on the side. The connecting pipe 75 is provided with holes to allow the hot water and other media to contact the media injection pipe 50 when the geothermal zone U is covered by a fluid medium such as hot water.

The connecting pipe 75 is to protect the media injection pipe 50 from being crushed by the rock plate etc. due to the collapse of the rock plate etc., and to prevent the rock plate etc. from collapsing or the intrusion of soil and sand into the side wall of the media injection pipe 50 and hot water Areas waiting for media contact.

In addition, the medium moving hole 76 may be a hole formed in a mesh shape. In this way, if the connecting pipe 75 is hot water in the geothermal zone U, it is advisable to adopt a structure such that rocks, sand, etc. do not contact the media injection pipe 50 to ensure the area where the fluid such as hot water contacts the media injection pipe 50.

Next, FIG. 25 shows a part of the heat medium delivery pipe 600 at the lowermost part of the medium injection pipe 50 where the hot water L2 exists. As shown in Figure 25, the heat transfer pipe 600 is in the case where the endothermic area 26 is the crushing zone 43 or the rock disk zone 38. This embodiment shows the case where the crushing zone 43 is attached. The media injection pipe 50 and the crushing zone 43 are connected between The heat receiving tube 243 is fixed by a high-density filling layer 244 formed of resin or geothermal cement.

The heat medium delivery pipe 600 is provided with a cylindrical heat receiving pipe 243 with a metal bottom represented by copper or the like for receiving the transfer promoting medium 239 between the heat receiving pipe 243 and the medium injection pipe 50.

On the other hand, in the heat transfer pipe 600, in order to make the heat transfer between the medium injection pipe 50 and the geothermal zone U good, the heat receiving pipe 243 and the medium injection pipe 50 are filled with water as the transfer promotion medium 239.

In addition, in order to prevent blowout caused by the boiling of the transfer promoting medium 239, the heat transfer pipe 600 is provided with a sealing cap 241 that seals the transfer promoting medium 239 inside. The sealing cover 241 is formed of concrete such as metal, resin or geothermal cement.

In addition, the heat medium delivery pipe 600 further injects the transfer promotion medium 239 above the sealing cover 241, and the transfer promotion medium 239 fills the heat receiving pipe 243 so that the sealing cover 241 does not move upward due to blowout. Therefore, the upper transfer promotion medium 239 can be supplemented, so that the transfer promotion medium 239 located below the sealing cover 241 evaporates from the gap of the sealing cover 241 and disappears, and the effect of the pressure plate of the sealing cover 241 is also achieved. .

In addition, the transfer promoting medium 39 may be not only water, but also a liquid resin containing metal for easy heat transfer.

As described above, in the present invention, the geothermal zone U of the heat absorption area 26 is a rock band 38 or a broken zone 43 with poor heat transfer, and a transfer promoting medium 239 is interposed between the heat transfer pipe 600 and the geothermal zone U. And it can absorb the heat of the geotropical U efficiently. In addition, the heat receiving tube 243 can also be installed on the ground surface S to supplement the transfer promotion medium 239 from the ground. In addition, the heat receiving tube 243 may have a length up to the area where the fluid exists.

(The sixth embodiment) 21 to 22, the structure of the geothermal power generation system 400 of the present invention in the sixth embodiment will be described. FIG. 21 is a schematic diagram showing the configuration of the geothermal power generation system 400 of the present invention in the sixth embodiment. Fig. 22 is a schematic diagram showing the configuration of the heat medium transport pipe 410f of the present invention in the sixth embodiment.

As shown in Figure 21, the geothermal power generation system 400 is mainly composed of a pressurized water supply pump 3, a plurality of heat medium delivery pipes 410 (410a~410f), a warm water storage tank 4, a condensing unit 17, a water supply unit 18, and a gas-water separator F. Steam turbine T, generator G, and power receiving equipment TF are composed. The geothermal power generation system 400 exchanges heat with water as a medium that is supplied to the deepest part of the ground through the media injection pipe 50 by the pressurizing water supply pump 3, pressurizes the water as hot water, and sends it to the hot media outlet pipe 80. Transport on the ground. With the pressure regulating valve PV1, the delivered hot water L3 is decompressed and boiled and delivered to the gas-water separator F. The steam and hot water are separated by the gas-water separator F, and the generated steam V1 is supplied to the steam turbine T. The geothermal power generation system 400 supplies the generated steam V1 to the steam turbine T, rotates the generator G to perform power generation, supplies power to the power receiving device TF, and supplies power to power companies and the like through the power transmission network. The steam turbine T can be not only in the form of a turbine, but also in the form of a propeller, etc., as long as it can generate electricity from steam.

The hot water L3 supplied to the gas-water separator F has not all become steam V1, so a large amount of hot water L4, that is, drain water, is sent from the gas-water separator F to the warm water storage tank 4. In addition, the steam V3 discharged 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 CT connected to the condenser 6. The delivered vapor V4 is condensed and returned to water, and is first accumulated in the condensation tank 14 through the condenser 6, and then sent to the warm water storage tank 4 by the condensation pump 5.

The warm water L8 in the warm water storage tank 4 is sent to the heat medium transfer pipe 410 as the warm water L1 by the pressurized water supply pump 3. The warm water L1 delivered by the pressurized water supply pump 3 absorbs heat from the underground heat in a certain depth of the geothermal zone U again to exchange heat. The hot water L2 that has undergone heat exchange is delivered by the pressurized water supply pump 3 through the heat medium delivery pipe 410 described later. In addition, the present invention can also apply a plurality of heat medium delivery pipes (410a to 410f) to the two-cycle power generation equipment of A and B in the above-mentioned embodiment 2 to embodiment 5.

As shown in FIG. 21, the heat medium conveying pipe 410 has a plurality of heat medium conveying pipes (410a to 410f) installed from the ground surface S to the geothermal belt U. 22, as a representative example of the heat medium transport pipe 410 (410a to 410f), the heat medium transport pipe 410f will be described. The geothermal power generation system 400 is constructed as follows: the media injection pipe 50 absorbs the underground heat of the geotropic U, exchanges heat with hot water (L2) as a heat medium, and transports the hot water (L3) to the ground. If the temperature of the transfer promoting medium 39 is lowered due to the heat failure of the tropical U in the vicinity of 50, the flow path switching valve 413 and the flow path switching valve 414 installed on the upper side of the heat transfer pipe 410f are switched to The water of the heat medium circulates in the heat medium conveying pipe 410f reaching the geothermal zone U.

When circulating the hot water L3 in the heat medium delivery pipe 410f, a pressure feed pump 411 is provided for applying pressure to circulate it without boiling. In addition, the geothermal power generation system 400 uses the pressurized water supply pump 3 to apply pressure so that it does not boil even during normal power generation, and circulates through the path of the plural heat transfer pipes 410, but one pressurized water supply pump 3 is not enough In the case of using pressure feed pump 411. The pressure feed pump 411 plays a role of pressure adjustment to make the pressure in the heat medium delivery pipe 410f constant. Pressure is applied so that the heat medium delivery pipe 410f does not boil. By keeping the hot water circulating in the heat medium delivery pipe 410f while maintaining a single-phase flow, compared to making the hot water flow through the heat medium delivery pipe 410f as a gas-liquid two-phase flow In the case of internal circulation, heat can be efficiently absorbed from the geothermal zone U.

The heat medium delivery pipe 410f includes a circulation sensor unit 412, and the circulation sensor unit 412 is provided with a temperature sensor and a pressure sensor for measuring the temperature and pressure of the hot water L3 in the middle of the circulation path. The heat transfer pipe 410f, even if power generation is not performed due to the unexpected drop in the temperature of the geothermal zone U due to regular maintenance or natural disasters, etc., the pressure regulating valve PV1 is used to adjust the temperature of the hot water The uniform method includes the circulation of water in the geothermal zone U to make the temperature of the circulating hot water uniform. Therefore, by measuring the circulation sensor part 412 installed on the ground, even if the temperature of the geothermal zone U is unknown, the ground can be estimated. The temperature state of the tropical U makes the power generation a planned index.

(Technical features considered from the above implementation mode) Although an example of the technical features of the present embodiment is shown in parentheses below, it is only an illustration and not a limitation, and the effects considered from these features are also described. ＜The first characteristic point＞ A heat transfer pipe (for example, mainly heat transfer pipe 10 (medium injection pipe 50, heat transfer pipe 80), 410, 500), which transports media (for example, mainly water, oil, etc.) underground, will be The medium for recovering underground heat absorption. The heat medium conveying pipe is characterized by having: pipe fittings (for example, mainly pipe threaded joints 51 and 55), connecting plural heat medium conveying pipes; and heat medium heat preservation Pipes (for example, mainly heat-insulating pipes 60 and 90), continuously cover the pipe fittings and a part of the heat-medium conveying pipe inside the heat-medium conveying pipe to keep the heat possessed by the medium.

With the above features, the present invention not only improves the heat preservation performance of the heat medium conveying pipe by the heat preservation pipe, but also facilitates the replacement of the heat medium heat preservation pipe itself and the installation of the heat medium conveying pipe.

＜The second characteristic point＞ The feature of the present invention is that the heat medium insulation tube includes: an insertion tube (for example, mainly the insertion tube 61) inserted into the inside of the heat medium delivery tube; and a protrusion (for example, mainly the protrusion 62), The heat transfer pipe has a larger diameter than the inner diameter and is held inside the pipe fitting. With the above features, the present invention facilitates the replacement of the heat medium insulation pipe itself and the installation of the heat medium delivery pipe.

＜The third characteristic point＞ The feature of the present invention is that the heat medium delivery pipe includes a gripping portion (for example, mainly gripping portions 47 and 87), which is provided at the time of connecting the heat medium delivery pipe and the pipe fitting screw when the pipe fitting is connected. The heat transfer pipe is held near the screw part of the joint connection; and the coating layer (for example, mainly the coating layer 46, 86) is set to avoid the holding part and is covered with a heat insulating material; the heat medium heat preservation pipe includes at least The insertion tube extending to the part of the grip. With the above-mentioned characteristics, the present invention improves the heat-preservation performance of the heat-medium conveying pipe by the heat-medium heat-insulating pipe of the connecting pipe in a manner that does not damage the performance of the connection operation of the heat-medium conveying pipe. In addition, the heat transfer pipe can take the media out of the ground without taking heat.

＜Fourth characteristic point＞ The feature of the present invention is that the heat medium delivery pipe includes: a medium injection pipe (for example, mainly a medium injection pipe 50) for conveying the medium underground; and a medium extraction pipe (for example, mainly a heat medium extraction pipe 80), The medium that absorbs heat from the ground is taken out to the ground; the medium injection pipe and the medium take-out pipe are equipped with the heat medium insulation pipe. With the above-mentioned features, the present invention improves the heat preservation performance of the medium injection pipe and the heat medium delivery pipe by using the heat medium heat preservation pipe. The heat transfer pipe can take out the medium from the ground through the medium take-out pipe without taking heat.

＜Fifth characteristic point＞ The feature is that the geothermal power generation system is equipped with: generators (for example, mainly generator G or dual-cycle generator B), which use the heat of the medium taken out to the ground to generate electricity; concrete insulation layer (for example, mainly geothermal cement), In the heat-absorbing area outside the heat-absorbing area where the medium absorbs the heat required for power generation, the heat-insulating area used to keep the heat of the medium being transported is insulated by consolidating the cement on the side wall of the hole dug during digging. ; The second coating layer (for example, mainly a heat-insulating material 70), covering the media injection pipe and pipe joints with a heat-insulating material; and a pressure pump (for example, mainly a pressurized water supply pump 3) to maintain the expectations of the media The pressure above the saturated vapor pressure of the temperature is delivered in a way that does not change the phase state of the medium.

With the above features, the heat medium delivery pipe can take out the medium from the ground through the medium take-out pipe without taking heat, so the ground heat itself can be used to generate electricity.

＜The sixth characteristic point＞ The feature of the present invention is that it is provided with a pipe fitting covering part (for example, mainly a pipe fitting threaded joint covering part 93) which covers the pipe fitting joint after connecting the heat transfer pipes to each other through the pipe fitting joint The whole way is covered from the outside. With the above-mentioned features, the heat transfer pipe can transmit part of the pipe joints and block the heat transfer by the pipe joints.

＜The seventh characteristic point＞ A heat medium conveying pipe (for example, mainly heat medium conveying pipe 10 (medium injection pipe 50, heat medium extraction pipe 80), 410, 500), which conveys the medium underground, and recovers the medium that absorbs heat underground. Its characteristics The following is: a convection blocking part (for example, mainly a convection shielding disk 73) is provided at a plurality of positions in the vertical direction, and the convection blocking part blocks the heat transfer pipe from the tubular heat transfer pipe and the outer circumference of the heat transfer pipe. The groundwater infiltrated between the protection pipes (for example, the third protection pipe 33) flows upward and downward.

With the above features, the convection blocking part can further improve the heat preservation performance of the heat transfer pipe by preventing the following situations: the hot water that penetrates into the gap between the heat transfer pipe and the protection pipe from below is different from the one located above The low-temperature water convections and mixes to become low-temperature water.

＜8th characteristic point＞ The feature of the present invention is that the convection blocking part is provided with a circular ring shape, which is located below the pipe fitting connecting the heat medium conveying pipe, and has an inner diameter larger than the outer circumference of the media conveying pipe and larger than the outer circumference of the pipe fitting The diameter is smaller. With the above-mentioned features, the present invention has a structure that does not escape upward due to the water pressure of the groundwater and the like, and improves the operability during installation.

＜The ninth characteristic point＞ A heat transfer pipe that transports media underground and recovers the media that absorbs heat underground, and is characterized by having a plurality of protection tubes (for example, mainly the first protection tube 31, the second protection tube 32, and the third protection tube The pipe 33) is arranged on the outer circumference of the heat transfer pipe; a heat insulating layer (for example, mainly foamed concrete 36, 37) is arranged between the protection pipe and other protection pipes; and a sealing layer (for example, mainly The closed parts 34 and 35) are below the insulation layer to prevent the penetration of groundwater from below.

With the above characteristics, the sealing layer prevents the penetration of water at a lower temperature than the warm water circulating in the heat transfer pipe from below, and improves the heat insulation performance of the heat transfer pipe.

＜10th characteristic point＞ The feature of the present invention is that the heat insulating layer is formed of a light base material or concrete containing a large amount of air bubbles. With the above features, the present invention not only prevents the penetration of water, but also improves the thermal insulation performance by containing a large amount of air.

＜11th characteristic point＞ The feature of the present invention is that the sealing layer is formed of concrete. With the above features, the present invention can prevent the penetration of water by the sealing layer, and prevent the temperature of the heat transfer pipe from being lowered due to the penetration of groundwater.

＜12th characteristic point＞ A geothermal power generation system with a plurality of underground transport media (for example, mainly water, oil, etc.), heat transfer pipes (for example, mainly heat transfer pipe 10 (media The injection pipe 50, the heat medium extraction pipe 80), 410, 500) use the heat of the recovered medium to generate electricity. The feature is that the geothermal power generation system includes a switching valve (for example, a flow switching valve 414), In order to make the medium circulate in the medium of the heat medium conveying pipe, the flow path of the medium is switched; and the pressure adjusting device (for example, mainly the pressure pump 411), keeps the pressure at a predetermined level without changing the state of the medium The pressure causes the medium to circulate; when the temperature of the medium decreases, the switching valve and the pressure adjusting device are driven to make the medium circulate in the heat medium conveying pipe medium until the temperature of the medium recovers.

With the above features, the present invention applies pressure in the heat medium delivery pipe so that it does not boil, so that the hot water maintains a single-phase flow and circulates in the heat medium delivery pipe, compared to the gas-liquid two-phase flow cycle Under the circumstances, heat can be efficiently absorbed from the geothermal zone U.

＜13th characteristic point＞ The feature of the present invention is that a temperature measuring device (for example, mainly a circulation sensor unit 412 (temperature sensor)) is provided, and the temperature of the medium is measured on the path through which the medium is circulated. With the above features, even if the temperature of the geothermal zone is unknown, the present invention still circulates the hot water including the geothermal zone by making the temperature of the hot water uniform, and the circulating heat can be measured by the temperature measuring device The temperature of the water can be used as an indicator of whether the temperature of the geotropics has recovered.

＜14th characteristic point＞ A construction method for a heat transfer pipe (for example, mainly heat transfer pipe 10 (media injection pipe 50, heat transfer pipe 80), 410, 500), which transports the medium underground (for example, mainly Water, oil, etc.)), the medium that absorbs heat in the ground is recovered. The construction method consists of the following steps: The first sealing step is to make cement (for example, mainly cement, geothermal cement) flow into the dug hole to form The first sealing layer (for example, mainly the closed portion 35) that seals the dug hole; the first protection tube embedding step, the first protection tube (for example, mainly the first protection tube) is embedded in the hole formed by the first sealing step 1 Protective tube 31); In the second sealing step, after the first sealing layer is stabilized, excavate each of the first sealing layers with a smaller diameter than the holes of the first sealing layer to allow cement to flow into the The excavated hole forms a second sealing layer (for example, mainly the closed portion 34) that seals the excavated hole; the second protective tube embedding step is to embed a second protective layer in the hole formed by the second sealing step Tube (for example, mainly the second protective tube 32); in the third protective tube embedding step, after the second sealing layer is stabilized, each second sealing layer has a smaller diameter than the hole of the second sealing layer The layer is excavated, and a third protective tube (for example, mainly the third protective tube 33) is buried in the drilled hole; the insulating layer formation step is to make foamed concrete (for example, mainly foamed concrete 36, 37) ), flows into between the first protection tube and the second protection tube, and between the second protection tube and the third protection tube; and the heat transfer pipe embedding step, after the third protection tube embedding step, Digging is performed with a diameter smaller than the hole of the third protection pipe, and the heat transfer pipe is buried in the dug hole.

With the above features, the present invention prevents the penetration of water from below, which is lower than the hot water circulating in the heat medium conveying pipe, and improves the thermal insulation performance of the heat medium conveying pipe.

＜15th characteristic point＞ A geothermal power generation method that has a plurality of heat medium conveying pipes (for example, mainly heat medium conveying pipe 10 (medium injection) that transport media (for example, mainly water, oil, etc.) underground and recover the medium that absorbs heat underground The pipe 50, the heat medium extraction pipe 80), 410, 500) use the recovered heat of the medium to generate electricity, and its characteristics are: An insertion hole is provided in the rock disk existing in the geotropical zone (for example, mainly the rock disk belt 38). The insertion hole is a hole formed with a larger diameter than the heat transfer pipe, and the medium (for example, mainly The transfer promotion medium 39) and the heat transfer pipe are used to transfer the heat of the geothermal zone to the heat transfer pipe through the medium.

With the above features, the present invention, even if the geothermal zone is a rock band or rupture zone with poor heat transfer, a medium material can be interposed between the heat transfer pipe and the geothermal zone to efficiently absorb the heat of the geothermal zone.

＜16th characteristic point＞ A geothermal power generation method that has a plurality of roots underground to transport media (for example, mainly water, oil, etc.), a heat transfer pipe that recovers the media that absorbs heat underground, and uses the recovered heat of the media to generate electricity. Its characteristics are For, in the rupture zone (for example, mainly the rupture zone 43) existing in the geothermal zone, set: insertion hole, which is a hole formed with a larger diameter than the heat transfer pipe; and a media container (connecting pipe 75), Insert into the insertion hole to receive the transfer promotion medium (for example, mainly transfer promotion medium 39, water, oil, etc.); insert the medium container, and the transfer promotion medium contained in the medium container will heat the tropical zone To the heat transfer pipe.

With the above features, the present invention, even if the geothermal zone is a rock band or rupture zone with poor heat transfer, a medium material can be interposed between the heat transfer pipe and the geothermal zone to efficiently absorb the heat of the geothermal zone.

＜17th characteristic point＞ A heat medium conveying pipe (for example, mainly a heat medium conveying pipe 600) equipped with a medium injection pipe (for example, mainly a medium injection pipe 50) that conveys media in the geothermal zone, and absorbs heat from the geothermal zone where no fluid exists The medium take-out pipe (for example, mainly the heat medium take-out pipe 80) for taking out the medium to the ground. The area where the geothermal zone absorbs heat, and the area around the media injection pipe where the transfer promotion medium (for example, mainly the transfer promotion medium 239) that transfers the heat from the geothermal zone is injected; and the sealing means (for example, the main sealing cover 241), set in the area that absorbs heat from the geothermal zone, and seal the transfer promotion medium.

With the above-mentioned features, the heat medium delivery pipe 600 can make the heat transfer between the medium injection pipe 50 and the geothermal zone U good, and can prevent blowout caused by boiling.

＜18th characteristic point＞ The feature of the present invention is that the transfer promoting medium is further arranged above the sealing means. With the above features, the upper transfer promotion medium can be supplemented, so that the transfer promotion medium located below the sealing means evaporates and disappears from the gap of the sealing means, and the effect of the pressing plate of the sealing means is also achieved.

Another technical feature is that a plurality of through holes (for example, mainly media moving holes 76) are provided in the media container. Thereby, the heat transfer pipe can be protected from the collapse of the geothermal zone, and the heat transfer state of the fluid such as the fluid of the geothermal zone to the heat transfer pipe can be maintained.

The present invention is not limited to any of the above-mentioned embodiments. If it falls within the technical scope of the present invention, it can naturally be implemented in various forms. [Industrial availability]

As shown in the above embodiment, the present invention can be used not only in the tropics where hot springs spring out, but also in volcanic zones or submarine volcanic zones.

1,100,200,300,400: Geothermal power generation system 1a: Pressurized water heat exchange device 1b, 1c: Pressurized water power generation device 3: Pressurized water supply pump 4: Warm water storage tank 5: Condensate pump 6: Condenser 8: Replenishment sink 9: Soft water generator 10,410,410a~410f,500,600: Heat transfer pipe 14: Condensation tank 17: Condensing unit 18: Water supply unit 21, 25: Temperature distribution 22: Insulated area 23: Pressure range 26: Heat absorption area 27: Evaporation curve 31, 32, 33: protection tube 40: Injection tube 42,82: External thread 34, 35: closed part 36, 37: Foamed concrete 38: rock band 39,239: Delivery promotion media 43: Rupture Zone 50, 101: media injection tube 51, 55: pipe fitting threaded joint 52, 56: Internal thread 53,57: Placement space department 46, 86: Coating layer 47, 87: Control Department 60, 90, 91, 91a, 91b: insulation pipe 61: Insertion tube 62, 92, 92a, 92b: protrusion 70: Insulation material 71: Protective film department 72: Insulation layer 73: Convection shielding disk 74: Hot water 75: take over 76: Media moving hole 80, 80a: Heat medium removal tube 81, 81a: Take out the tube 85: Insulation 93: Covered part of pipe fitting threaded joint 150, 150c, 154, 154c: heat exchange part 151, 151c, 152, 152c, 153, 153c, 156, 156c: heat exchanger 155, 155c, 165c: circulation pump 157a, 157c: cooling water 154,156,164c: cooler 162: temperature adjustment system 161: storage tank 241: Seal cover 243: heat receiving tube 244: high density filling layer 411: Pressure pump 412: Cycle Sensor Department 413, 414: Flow switching valve B, C: Double cycle power generation device CT: cooling tower F: Gas-water separator G, G2, G3: generator L1~L4, L6~L8, L10: water M1, M2, M3, M21, M22, M23: Acting media PV1, PV2: pressure regulating valve S: Surface T, T2, T3: steam turbine TF, TF2: Power receiving equipment U: Geotropical V1~V4: Steam

[Fig. 1] is a schematic diagram showing the configuration of the geothermal power generation system of the present invention in the first embodiment. [Fig. 2] is a partial perspective view showing the heat medium delivery pipe of the present invention in the first embodiment. [Fig. 3] is a partial perspective view showing the disassembly of the media injection tube of the present invention in the first embodiment. [Fig. 4] is a partial longitudinal sectional view of the media injection pipe of the present invention in the first embodiment. [Figure 5] is a partial perspective view of the thermal insulation pipe of the present invention in the first embodiment. [Fig. 6] is a partial longitudinal sectional view of the media injection pipe of the present invention in the first embodiment. [Fig. 7] is a partial longitudinal sectional view of the heat medium delivery pipe of the present invention in the first embodiment. [Fig. 8] is a partial longitudinal sectional view of the heat medium extraction tube of the present invention in the first embodiment. [Figure 9] is a schematic diagram of the phase transition of water of the present invention in the first embodiment. [Fig. 10] is a graph showing the relationship between the depth of the heat transfer pipe and the temperature distribution of hot water in the geothermal power generation system of the present invention in the first embodiment. [Fig. 11] (A) to (C) are explanatory diagrams of experimental data showing the thermal insulation performance of the present invention in the first embodiment. [Fig. 12] is a schematic diagram showing the configuration of the geothermal power generation system of the present invention in the second embodiment. [Fig. 13] is a schematic diagram showing the configuration of the geothermal power generation system of the present invention in the third embodiment. [Fig. 14] is a schematic diagram showing the configuration of the geothermal power generation system of the present invention in the fourth embodiment. [Fig. 15] is a partially omitted longitudinal sectional view of the heat medium transport pipe of the present invention in the fifth embodiment. [Fig. 16] is a longitudinal sectional view in the middle of construction of the heat medium delivery pipe of the present invention of the fifth embodiment. [Fig. 17] is a longitudinal sectional view in the middle of construction of the heat transfer pipe of the present invention of the fifth embodiment. [Fig. 18] is a schematic view showing an enlarged part of the threaded joint of the heat medium conveying pipe of the present invention in the fifth embodiment. [Fig. 19] is a partially omitted longitudinal sectional view of a heat medium transport pipe according to a modification of the present invention of the fifth embodiment. [Figure 20] is a diagram showing the relationship between the depth of the heat transfer pipe and the temperature distribution of hot water in the geothermal power generation system of the present invention in the fifth embodiment. [Figure 21] is a schematic diagram showing the configuration of the geothermal power generation system of the present invention in the sixth embodiment. [Fig. 22] is a schematic diagram showing the structure of the heat transfer pipe of the present invention in the sixth embodiment. [Fig. 23] is a longitudinal sectional view showing a modification of the heat medium extraction pipe of the first embodiment. [Figure 24] is a schematic diagram showing a modified example of the takeover of the fifth embodiment. [Figure 25] is a schematic diagram showing a modification of the takeover of the fifth embodiment.

40: Injection tube

42,82: External thread

50: Media injection tube

51, 55: pipe fitting threaded joint

52, 56: Internal thread

53,57: Placement space department

60, 90, 91: insulation pipe

61: Insertion tube

62, 92: protrusion

80: Heat medium removal tube

Claims (2)

A heat-medium conveying pipe that conveys media underground and recovers the medium that absorbs heat underground. The heat-medium conveying pipe is characterized by comprising: The pipe fittings connect the heat medium delivery pipes with plural pieces; The heat insulation part keeps the pipe fittings and the heat possessed by the medium inside the heat transfer pipe; and Heat medium heat preservation pipe to keep the heat owned by the medium; In addition, the heat medium insulation pipe includes an insertion pipe whose end is extended to the heat insulation pipe. A geothermal power generation device is provided with the heat medium delivery pipe as described in item 1 of the scope of patent application, and the feature of the geothermal power generation device is: In the tropical zone that is the heat-absorbing area, and is more outer than the heat transfer pipe, set up a takeover, The connecting pipe is provided with a medium moving hole, which becomes a plurality of through holes penetrating the side surface of the connecting pipe, so that the fluid-like medium existing in the heat absorbing area is contacted with the medium injection pipe.

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