Utilization system of low-temperature geothermal water

Abstract

The utility model provides a utilization system of low-temperature geothermal water, which relates to the technical field of geothermal energy development, and comprises a first gas hydrate synthesis and dissociation device, a second gas hydrate synthesis and dissociation device, a second gas hydrate synthesis and dissociation device and a third gas hydrate synthesis and dissociation device, the second gas hydrate synthesis and dissociation device comprises a second reaction kettle and a second heat exchange pipe for heating the second reaction kettle, the geothermal water delivery pump is respectively connected with one end of the first heat exchange pipe and one end of the second heat exchange pipe, and the power generation device is respectively connected with the first reaction kettle and the second reaction kettle. High-pressure gas generated by heat exchange between low-temperature geothermal water and gas hydrate is used for expansion acting power generation instead of geothermal water vapor used for power generation traditionally, the requirement of geothermal energy power generation for the energy utilization temperature is remarkably lowered, and therefore the application range of low-temperature geothermal energy in the power generation field is widened; and the total power generation amount of low-temperature geothermal energy is increased.

Description

Technical Field

[0001] This utility model relates to the field of geothermal energy development technology, and in particular to a system for utilizing low-temperature geothermal water. Background Technology

[0002] Geothermal energy, as a abundant, renewable, and clean energy source, is characterized by its low-carbon, environmentally friendly, safe, and reliable nature. Compared with other renewable energy sources, geothermal energy has broad development prospects in multiple fields such as power generation, heating, cooling, and industrial applications. As a crucial component of building a clean, low-carbon energy utilization system, geothermal energy plays a vital role. Developing and utilizing geothermal resources can not only effectively reduce air pollution and carbon emissions but also mitigate issues such as climate change and environmental pollution, alleviating the pressure on resources caused by the current over-reliance on fossil fuels.

[0003] Compared to other geothermal energy utilization methods, geothermal power generation is a highly promising renewable energy technology with higher energy conversion efficiency and a wider range of applications. Current geothermal power generation typically utilizes high-temperature geothermal energy (above 100°C) to extract steam, which then drives a turbine to generate electricity. While high-temperature geothermal power generation technology is relatively mature, it faces challenges such as high drilling costs and uneven resource distribution, limiting its large-scale promotion and application.

[0004] Low-temperature geothermal energy, with temperatures below 100℃, has attracted much attention due to its wide distribution. However, its development and utilization are constrained by technical bottlenecks related to the utilization of low-grade heat. Therefore, how to rationally and effectively develop and utilize low-temperature geothermal energy for power generation has become an urgent problem to be solved. Utility Model Content

[0005] The purpose of this invention is to provide a system for utilizing low-temperature geothermal water, which can generate electricity using low-temperature geothermal water.

[0006] To achieve the above objectives, this utility model proposes a low-temperature geothermal water utilization system, wherein the low-temperature geothermal water utilization system includes at least:

[0007] The first gas hydrate synthesis and dissociation apparatus includes a first reaction vessel and a first heat exchange tube for heating the first reaction vessel. The first reaction vessel is used to synthesize and dissociate gas hydrates. After being heated by the first heat exchange tube, the gas hydrates in the first reaction vessel are dissociated.

[0008] The second gas hydrate synthesis and dissociation apparatus includes a second reaction vessel and a second heat exchange tube for heating the second reaction vessel. The second reaction vessel is used to prepare and dissociate gas hydrates. After being heated by the second heat exchange tube, the gas hydrates in the second reaction vessel are dissociated.

[0009] A geothermal water transfer pump is connected to one end of the first heat exchange tube and one end of the second heat exchange tube, respectively. The geothermal water transfer pump is used to extract low-temperature geothermal water and transfer the low-temperature geothermal water to the first heat exchange tube and the second heat exchange tube.

[0010] A power generation device is connected to the first reactor and the second reactor respectively. After the hydrates in the first reactor and the second reactor dissociate, high-pressure gas is generated. The high-pressure gas expands and drives the power generation device to operate and generate electricity.

[0011] The low-temperature geothermal water utilization system described above further includes a gas storage tank connected to the power generation device, which is used to store the expanded low-pressure gas and provide gas for subsequent gas hydrate generation.

[0012] The low-temperature geothermal water utilization system described above further includes a compressor, which is connected to the gas storage tank, the first reaction vessel, and the second reaction vessel. The compressor pressurizes the low-pressure gas in the gas storage tank and delivers it to the first reaction vessel and the second reaction vessel for gas hydrate growth.

[0013] The low-temperature geothermal water utilization system described above comprises a basic unit consisting of the geothermal water transfer pump, the first gas hydrate synthesis and dissociation device, the second gas hydrate synthesis and dissociation device, the power generation device, the gas storage tank, and the compressor. The low-temperature geothermal water utilization system includes multiple such basic units.

[0014] In the low-temperature geothermal water utilization system described above, the first gas hydrate synthesis and dissociation device and the second gas hydrate synthesis and dissociation device have the same structure.

[0015] The upper part of the first reactor is provided with a first geothermal water inlet, a first liquid inlet and a first gas outlet, and the lower part of the first reactor is provided with a first geothermal water outlet, a first liquid outlet and a first gas inlet. The two ends of the first heat exchange tube are respectively connected to the first geothermal water inlet and the first geothermal water outlet.

[0016] The upper part of the second reactor is provided with a second geothermal water inlet, a second liquid inlet and a second gas outlet, and the lower part of the second reactor is provided with a second geothermal water outlet, a second liquid outlet and a second gas inlet. The two ends of the second heat exchange tube are respectively connected to the second geothermal water inlet and the second geothermal water outlet.

[0017] The low-temperature geothermal water utilization system described above further includes an underground component:

[0018] A geothermal extraction well is used to extract low-temperature geothermal water, and a geothermal water delivery pump is connected to the geothermal extraction well and extracts the low-temperature geothermal water.

[0019] The reinjection well is connected to the other end of the first heat exchange pipe and the other end of the second heat exchange pipe, respectively, and reinjects the low-temperature geothermal water in the first heat exchange pipe and the second heat exchange pipe into the ground.

[0020] In the low-temperature geothermal water utilization system described above, the first heat exchange tube is sealed through the first reaction vessel, and the second heat exchange tube is sealed through the second reaction vessel. The low-temperature geothermal water exchanges heat with the gas hydrate in the reaction vessel through the first heat exchange tube and the second heat exchange tube.

[0021] In the low-temperature geothermal water utilization system described above, the power generation device is a pneumatic generator.

[0022] The low-temperature geothermal water utilization system described above, wherein the temperature of the low-temperature geothermal water is below 100°C.

[0023] The low-temperature geothermal water utilization system described above is installed outdoors, and during the gas hydrate synthesis process, an outdoor air cold source provides a temperature environment for the synthesis of gas hydrates.

[0024] Compared with the prior art, the present invention has the following features and advantages:

[0025] (1) The low-temperature geothermal water utilization system provided by this utility model is based on the dissociation and expansion characteristics of gas hydrates, that is, a significant pressure difference can be generated under small temperature changes. Specifically, by exchanging heat between low-temperature geothermal water below 100℃ and gas hydrates, the gas hydrates are dissociated and high-pressure gas is released. The high-pressure gas is then expanded to do work, driving a power generation device to generate electricity. Compared with traditional geothermal power generation technology (which usually requires water temperature between 100℃ and 370℃), this utility model can significantly reduce the temperature requirements for energy utilization in geothermal power generation, greatly expand the application range of low-temperature geothermal energy, realize the efficient utilization of low-grade geothermal resources, and increase the total power generation of low-temperature geothermal energy.

[0026] (2) The core of the low-temperature geothermal water utilization system provided by this utility model is the use of gas hydrate as a heat exchange medium. In the process of synthesizing gas hydrate, only gas and water are needed as raw materials. Water is a green and inexpensive medium, which can effectively avoid the leakage problems that may occur when organic working fluid or ammonia water mixture is used in traditional dual-cycle geothermal power generation systems, thereby ensuring the environmental protection and safety of the entire power generation process, and having a low operating cost.

[0027] (3) The low-temperature geothermal water utilization system provided by this utility model is mainly used in cold regions with low average outdoor temperatures. It can effectively utilize the low-temperature environment to synthesize gas hydrates, thereby avoiding the use of additional refrigeration equipment and further saving operating costs. Attached Figure Description

[0028] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0029] Figure 1 This is a schematic diagram of the structure of a low-temperature geothermal water utilization system proposed in this utility model.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Geothermal water transfer pump; 2. First gas hydrate synthesis and dissociation device; 3. Second gas hydrate synthesis and dissociation device; 4. Power generation device; 5. Gas storage tank; 6. Compressor; 7. Geothermal extraction well; 8. Reinjection well; 9. First reaction vessel; 10. First heat exchange tube; 11. First geothermal water inlet; 12. First geothermal water outlet; 13. First liquid inlet; 14. First liquid outlet; 15. First air inlet; 16. First air outlet; 17. Second reaction vessel; 18. Second heat exchange tube; 19. Second geothermal water inlet; 20. Second geothermal water outlet; 21. Second liquid inlet; 22. Second liquid outlet; 23. Second air inlet; 24. Second air outlet; 25. Third air inlet; 26. Third air outlet; 27. Fourth air inlet; 28. Fourth air outlet; 29. ​​Control valve; 100. Low-temperature geothermal water utilization system. Detailed Implementation

[0032] The details of this utility model can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of this utility model described herein are for illustrative purposes only and should not be construed as limiting the utility model in any way. Under the teachings of this utility model, those skilled in the art can conceive of any possible modifications based on this utility model, and these should all be considered to fall within the scope of this utility model.

[0033] like Figure 1 As shown, this utility model proposes a low-temperature geothermal water utilization system 100, which includes a first gas hydrate synthesis and dissociation device 2, a second gas hydrate synthesis and dissociation device 3, a geothermal water transfer pump 1, and a power generation device 4. The first gas hydrate synthesis and dissociation device 2 includes a first reaction vessel 9 and a first heat exchange tube 10 for heating the first reaction vessel 9. The first reaction vessel 9 is used to synthesize and dissociate gas hydrates. After being heated by the low-temperature geothermal water in the first heat exchange tube 10, the gas hydrates in the first reaction vessel 9 dissociate to generate high-pressure gas. The second gas hydrate synthesis and dissociation device 3 includes a second reaction vessel 17 and a second heat exchange tube 18 for heating the second reaction vessel 17. The second reaction vessel 17 is used to synthesize and dissociate gas hydrates. After being heated by the low-temperature geothermal water in the second heat exchange tube 18, the second gas hydrate synthesis and dissociation device 3 generates high-pressure gas. The gas hydrate in the reactor 17 dissociates to generate high-pressure gas; the geothermal water transfer pump 1 is connected to one end of the first heat exchange tube 10 and one end of the second heat exchange tube 18 respectively. The geothermal water transfer pump 1 is used to extract low-temperature geothermal water and transport the low-temperature geothermal water to the first heat exchange tube 10 and the second heat exchange tube 18; the power generation device 4 is connected to the first reactor 9 and the second reactor 17 respectively. The power generation device 4 uses the high-pressure gas generated by the dissociation of gas hydrate in the first reactor 9 and the second reactor 17 to generate electricity. The high-pressure gas expands to drive the power generation device 4 to operate and generate electrical energy.

[0034] The low-temperature geothermal water utilization system 100 proposed in this utility model also includes a gas storage tank 5, which is connected to the power generation device 4 and is used to store the expanded low-pressure gas and provide gas for the subsequent generation of gas hydrates.

[0035] The low-temperature geothermal water utilization system 100 proposed in this utility model also includes a compressor 6, which is connected to a gas storage tank 5, a first reaction vessel 9, and a second reaction vessel 17, respectively, and is used to pressurize the low-pressure gas in the gas storage tank 5 and transport it to the reaction vessel for gas hydrate growth.

[0036] The low-temperature geothermal water utilization system 100 proposed in this utility model has the same structure for the first gas hydrate synthesis and dissociation device 2 and the second gas hydrate synthesis and dissociation device 3. Specifically, the first gas hydrate synthesis and dissociation device 2 is provided with a first geothermal water inlet 11, a first liquid inlet 13 and a first gas outlet 16 communicating with the outside at the upper part, and a first geothermal water outlet 12, a first liquid outlet 14 and a first gas inlet 15 communicating with the outside at the lower part. Similarly, the second gas hydrate synthesis and dissociation device 3 is provided with a second geothermal water inlet 19, a second liquid inlet 21 and a second gas outlet 24 communicating with the outside at the upper part, and a second geothermal water outlet 20, a second liquid outlet 22 and a second gas inlet 23 communicating with the outside at the lower part.

[0037] The present invention proposes a low-temperature geothermal water utilization system 100, wherein the two ends of the first heat exchange tube 10 are respectively connected to the first geothermal water inlet 11 and the first geothermal water outlet 12; and the two ends of the second heat exchange tube 18 are respectively connected to the second geothermal water inlet 19 and the second geothermal water outlet 20.

[0038] The low-temperature geothermal water utilization system 100 proposed in this utility model further includes: a geothermal extraction well 7 installed underground for extracting low-temperature geothermal water, wherein the geothermal water delivery pump 1 is connected to the geothermal extraction well 7 and extracts the low-temperature geothermal water; and a reinjection well 8 connected to the other end of the first heat exchange pipe 10 and the other end of the second heat exchange pipe 18 respectively and reinjecting the low-temperature geothermal water in the first heat exchange pipe 10 and the second heat exchange pipe 18 back underground.

[0039] The present invention proposes a low-temperature geothermal water utilization system 100, wherein the first heat exchange tube 10 is sealed through the first reaction vessel 9, and the second heat exchange tube 18 is sealed through the second reaction vessel 17. The low-temperature geothermal water exchanges heat with the gas hydrates in the first reaction vessel 9 and the second reaction vessel 17 through the first heat exchange tube 10 and the second heat exchange tube 18.

[0040] like Figure 1 As shown, in an optional embodiment, the power generation device 4 is provided with a third air inlet 25 and a third air outlet 26. The third air inlet 25 is connected to the first air outlet 16 and the second air outlet 24 of the first gas hydrate synthesis and dissociation device 2 and the second gas hydrate synthesis and dissociation device 3, and the third air outlet 26 is connected to the fourth air inlet 27 of the gas storage tank 5.

[0041] like Figure 1In the illustrated embodiment, the gas storage tank 5 is provided with a fourth air inlet 27 and a fourth air outlet 28; the fourth air inlet 27 is connected to the third air outlet 26 of the power generation device 4 and is used to receive the expanded low-pressure gas; the fourth air outlet 28 is connected to the first air inlet 15 and the second air inlet 23 of the first gas hydrate synthesis and dissociation device 2 and the second gas hydrate synthesis and dissociation device 3, respectively, to provide gas for the gas hydrate synthesis process.

[0042] like Figure 1 In the illustrated embodiment, the compressor 6 is connected to the gas storage tank 5 and is used to pressurize the low-pressure gas in the gas storage tank 5 and then transport it to the first reaction vessel 9 and the second reaction vessel 17 through the first air inlet 15 and the second air inlet 23 for the growth of gas hydrates.

[0043] like Figure 1 As shown, in an optional embodiment, the first geothermal water inlet 11, the first geothermal water outlet 12, the first liquid inlet 13, the first liquid outlet 14, the first air inlet 15, the first air outlet 16, the second geothermal water inlet 19, the second geothermal water outlet 20, the second liquid inlet 21, the second liquid outlet 22, the second air inlet 23, the second air outlet 24, and the fourth air outlet 28 are all equipped with control valves 29.

[0044] The low-temperature geothermal water utilization system 100 proposed in this utility model utilizes the unique dissociation and expansion characteristics of gas hydrates, which can generate significant pressure differences under small temperature changes. It exchanges heat between low-temperature geothermal water below 100°C and gas hydrates, causing the gas hydrates to dissociate and release high-pressure gas. Subsequently, the high-pressure gas expands and does work, driving the power generation device 4 to generate electricity, thereby realizing the conversion of internal energy into electrical energy and significantly reducing the energy temperature requirements for geothermal power generation.

[0045] The present invention proposes a low-temperature geothermal water utilization system 100, wherein the power generation device 4 is a pneumatic generator.

[0046] The present invention proposes a low-temperature geothermal water utilization system 100, wherein the temperature of the low-temperature geothermal water is below 100°C.

[0047] The low-temperature geothermal water utilization system 100 proposed in this utility model is mainly suitable for cold regions with low outdoor temperatures. The low-temperature geothermal water utilization system 100 is installed outdoors, and during the gas hydrate synthesis process, it provides a temperature environment for the synthesis of gas hydrates through an outdoor air cold source.

[0048] The low-temperature geothermal water utilization system 100 proposed in this utility model comprises a geothermal water delivery pump 1, a first gas hydrate synthesis and dissociation device 2, a second gas hydrate synthesis and dissociation device 3, a power generation device 4, a gas storage tank 5, and a compressor 6, which together form a basic unit. The number of basic units can be increased according to the scale of geothermal energy and electricity demand.

[0049] Example 1

[0050] In this embodiment 1, the first gas hydrate synthesis and dissociation device 2 and the second gas hydrate synthesis and dissociation device 3 first simultaneously synthesize gas hydrates, and then sequentially dissociate the gas hydrates. Specifically, combined with Figure 1 The structural diagram shown below illustrates the specific workflow and steps as follows:

[0051] (1) Open the valves of the first liquid inlet 13, the first gas inlet 15, the second liquid inlet 21, the second gas inlet 23 and the fourth gas outlet 28, while ensuring that the other valves are closed; after introducing an appropriate amount of water and gas into the first reactor 9 and the second reactor 17, close the valves of the first liquid inlet 13 and the second liquid inlet 21, and then use the low temperature environment of the cold region to promote the synthesis of gas hydrate in the first reactor 9 and the second reactor 17; as the gas hydrate is synthesized, the gas pressure in the first reactor 9 and the second reactor 17 gradually decreases, and the gas storage tank 5 continues to replenish the gas in the first reactor 9 and the second reactor 17 until the gas pressure in the first reactor 9 and the second reactor 17 remains constant. At this time, it can be considered that the formation of gas hydrate has been completed, and then close the valves of the first gas inlet 15, the second gas inlet 23 and the fourth gas outlet 28.

[0052] (2) After the gas hydrate synthesis is completed, the valves at both ends of the first heat exchange tube 10 corresponding to the first reactor 9 need to be opened first. Then, the geothermal water pump 1 extracts low-temperature geothermal water from the geothermal well 7 and transports it to the first heat exchange tube 10 to exchange heat with the synthesized gas hydrate, thereby dissociating gas and water. When the pressure of the dissociated gas is high enough, the valve of the first outlet 16 is opened and the high-pressure gas released is discharged from the first outlet 16 and enters the power generation device 4 through the third inlet 25 to generate electricity. The low-pressure gas after expansion and depressurization is discharged from the third outlet 26 of the power generation device 4 and enters the gas storage tank 5 through the fourth inlet 27. The low-temperature geothermal water after heat exchange is discharged from the first geothermal water outlet 12 to the reinjection well 8, and the water generated by the dissociation of gas hydrate is finally discharged from the first liquid outlet 14.

[0053] (3) After the gas hydrate in the first reactor 9 is completely dissociated, close the valves at both ends of the first heat exchange tube 10 corresponding to the first reactor 9; open the valves at both ends of the second heat exchange tube 18 corresponding to the second reactor 17; at this time, the geothermal water transfer pump 1 delivers low-temperature geothermal water to the second heat exchange tube 18 corresponding to the second reactor 17, and exchanges heat with the gas hydrate that has been synthesized in the second reactor 17, thereby dissociating gas and water; when the pressure of the dissociated gas is high enough, open the valve of the second outlet 24, and the released high-pressure gas is discharged from the second outlet 24 and enters the power generation device 4 through the third inlet 25 to generate electricity, while the low-pressure gas after expansion and depressurization is discharged from the third outlet 26 of the power generation device 4 and enters the gas storage tank 5 through the fourth inlet 27; the low-temperature geothermal water after heat exchange is discharged from the second geothermal water outlet 20 to the reinjection well 8, and the water generated by the dissociation of gas hydrate is finally discharged from the second liquid outlet 22.

[0054] (4) After the gas hydrate in the second reactor 17 is completely dissociated, close all valves and repeat steps (1)-(3).

[0055] Example 2

[0056] In this embodiment 2, the first gas hydrate synthesis and dissociation device 2 and the second gas hydrate synthesis and dissociation device 3 alternately perform the synthesis and dissociation operations of gas hydrates. Specifically, combined with Figure 1 The structural diagram shown below illustrates the specific workflow and steps as follows:

[0057] (1) Open the valves of the first liquid inlet 13, the first gas inlet 15 and the fourth gas outlet 28, while ensuring that the other valves are closed; after introducing an appropriate amount of water and gas into the first reactor 9, close the valve of the first liquid inlet 13, and then use the low temperature environment of the cold region to promote the synthesis of gas hydrate in the first reactor 9; as the gas hydrate is synthesized, the gas pressure in the first reactor 9 gradually decreases, and the gas storage tank 5 continues to replenish the gas in the first reactor 9 until the gas pressure in the first reactor 9 remains constant. At this time, it can be considered that the formation of gas hydrate has been completed, and then close the valves of the first gas inlet 15 and the fourth gas outlet 28.

[0058] Simultaneously, the valves at both ends of the second heat exchange tube 18 corresponding to the second reactor 17 are opened; then, the geothermal water transfer pump 1 extracts low-temperature geothermal water from the geothermal extraction well 7 and transports it to the second heat exchange tube 18, where it exchanges heat with the synthesized gas hydrate, thereby dissociating gas and water; when the pressure of the dissociated gas is high enough, the valve of the second outlet 24 is opened, and the released high-pressure gas is discharged from the second outlet 24 and enters the power generation device 4 through the third inlet 25 to generate electricity, while the low-pressure gas after expansion and depressurization is discharged from the third outlet 26 of the power generation device 4 and enters the gas storage tank 5 through the fourth inlet 27; the low-temperature geothermal water after heat exchange is discharged from the second geothermal water outlet 20 to the reinjection well 8, while the water generated by the dissociation of the gas hydrate is finally discharged from the second liquid outlet 22.

[0059] (2) After the gas hydrate in the first reactor 9 has been synthesized and the gas hydrate in the second reactor 17 has been completely dissociated, close the valves at both ends of the second heat exchange tube 18 and open the valves of the second liquid inlet 21, the second gas inlet 23 and the fourth gas outlet 28; after introducing an appropriate amount of water and gas into the second reactor 17, close the valve of the second liquid inlet 21, and then use the low temperature environment of the cold region to promote the synthesis of gas hydrate in the second reactor 17; as the gas hydrate is synthesized, the gas pressure in the second reactor 17 gradually decreases, and the gas storage tank 5 continues to replenish the gas in the second reactor 17 until the gas pressure in the second reactor 17 remains constant. At this time, it can be considered that the generation of gas hydrate has ended, and then close the valves of the second gas inlet 23 and the fourth gas outlet 28.

[0060] Simultaneously, the valves at both ends of the first heat exchange tube 10 corresponding to the first reactor 9 are opened; then, the geothermal water transfer pump 1 extracts low-temperature geothermal water from the geothermal extraction well 7 and transports it to the first heat exchange tube 10, where it exchanges heat with the gas hydrate that has been synthesized in the first reactor 9, thereby dissociating gas and water; when the pressure of the dissociated gas is high enough, the valve of the first outlet 16 is opened, and the released high-pressure gas is discharged from the first outlet 16 and enters the power generation device 4 through the third inlet 25 to generate electricity, while the low-pressure gas after expansion and depressurization is discharged from the third outlet 26 of the power generation device 4 and enters the gas storage tank 5 through the fourth inlet 27; the low-temperature geothermal water after heat exchange is discharged from the first geothermal water outlet 12 into the reinjection well 8, and the water generated by the dissociation of the gas hydrate is finally discharged from the first liquid outlet 14.

[0061] (3) When the gas hydrate in the first reactor 9 is completely dissociated and the gas hydrate in the second reactor 17 has been synthesized, close all valves and repeat steps (1)-(2).

[0062] The detailed explanations of the above embodiments are intended only to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions should not be construed as limiting the present invention for any reason. In particular, the features described in different embodiments can be arbitrarily combined with each other to form other embodiments. Unless there is an explicit description to the contrary, these features should be understood to be applicable to any embodiment, and not limited to the described embodiments.

Claims

1. A system for utilizing low-temperature geothermal water, characterized in that, The low-temperature geothermal water utilization system includes at least: The first gas hydrate synthesis and dissociation apparatus includes a first reaction vessel and a first heat exchange tube for heating the first reaction vessel. The first reaction vessel is used to synthesize and dissociate gas hydrates. After being heated by the first heat exchange tube, the gas hydrates in the first reaction vessel are dissociated. The second gas hydrate synthesis and dissociation apparatus includes a second reaction vessel and a second heat exchange tube for heating the second reaction vessel. The second reaction vessel is used to prepare and dissociate gas hydrates. After being heated by the second heat exchange tube, the gas hydrates in the second reaction vessel are dissociated. A geothermal water transfer pump is connected to one end of the first heat exchange tube and one end of the second heat exchange tube, respectively. The geothermal water transfer pump is used to extract low-temperature geothermal water and transfer the low-temperature geothermal water to the first heat exchange tube and the second heat exchange tube. A power generation device is connected to the first reactor and the second reactor respectively. After the hydrates in the first reactor and the second reactor dissociate, high-pressure gas is generated. The high-pressure gas expands and drives the power generation device to operate and generate electricity.

2. The system for utilizing low-temperature geothermal water according to claim 1, characterized by The low-temperature geothermal water utilization system also includes a gas storage tank, which is connected to the power generation device and is used to store the expanded low-pressure gas and provide gas for the subsequent generation of gas hydrates.

3. The system for utilizing low-temperature geothermal water according to claim 2, wherein The low-temperature geothermal water utilization system also includes a compressor, which is connected to the gas storage tank, the first reaction vessel, and the second reaction vessel respectively. The compressor pressurizes the low-pressure gas in the gas storage tank and delivers it to the first reaction vessel and the second reaction vessel for gas hydrate growth.

4. The system for utilizing low-temperature geothermal water according to claim 3, wherein The geothermal water transfer pump, the first gas hydrate synthesis and dissociation device, the second gas hydrate synthesis and dissociation device, the power generation device, the gas storage tank, and the compressor together form a basic unit, and the low-temperature geothermal water utilization system includes multiple such basic units.

5. The low-temperature geothermal water utilization system as described in claim 1, characterized in that, The first gas hydrate synthesis and dissociation device and the second gas hydrate synthesis and dissociation device have the same structure; The first reactor is provided with a first geothermal water inlet, a first liquid inlet and a first gas outlet at the upper part, and a first geothermal water outlet, a first liquid outlet and a first gas inlet at the lower part. The two ends of the first heat exchange tube are respectively connected to the first geothermal water inlet and the first geothermal water outlet. The second reactor is provided with a second geothermal water inlet, a second liquid inlet and a second air outlet at its upper part, and a second geothermal water outlet, a second liquid outlet and a second air inlet at its lower part, which are connected to the outside. The two ends of the second heat exchange tube are connected to the second geothermal water inlet and the second geothermal water outlet, respectively.

6. The system for utilizing low-temperature geothermal water according to claim 1, wherein The low-temperature geothermal water utilization system also includes underground installations: A geothermal extraction well is used to extract low-temperature geothermal water, and a geothermal water delivery pump is connected to the geothermal extraction well and extracts the low-temperature geothermal water. The reinjection well is connected to the other end of the first heat exchange pipe and the other end of the second heat exchange pipe, respectively, and reinjects the low-temperature geothermal water in the first heat exchange pipe and the second heat exchange pipe into the ground.

7. The system for utilizing low-temperature geothermal water according to claim 1, wherein The first heat exchange tube is sealed through the first reactor, and the second heat exchange tube is sealed through the second reactor. The low-temperature geothermal water exchanges heat with the gas hydrate in the reactor through the first heat exchange tube and the second heat exchange tube.

8. The low-temperature geothermal water utilization system as described in claim 1, characterized in that, The power generation device is a pneumatic generator.

9. The system for utilizing low-temperature geothermal water according to claim 1, wherein The temperature of the low-temperature geothermal water is below 100°C.

10. The system for utilizing low-temperature geothermal water according to claim 1, wherein The low-temperature geothermal water utilization system is installed outdoors, and during the gas hydrate synthesis process, an outdoor air cold source provides a temperature environment for the synthesis of gas hydrates.

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