Multi-energy power generation system based on deep geothermal energy and operation method thereof

Abstract

The invention belongs to the technical field of new energy, and discloses a multi-energy power generation system based on deep geothermal energy and an operation method of the multi-energy power generation system. The wind-solar power generation subsystem is used for converting wind energy or solar energy into electric energy; the hot dry rock power generation subsystem comprises a mining well; the coaxial sleeve heat exchange system is arranged in the mining well, and the bottom of the coaxial sleeve heat exchange system is in direct contact with the artificial thermal reservoir; the pumping equipment is used for pressurizing and conveying a liquid-phase heat exchange medium into the coaxial sleeve heat exchange system, and the liquid-phase heat exchange medium enters the artificial heat reservoir through the coaxial sleeve heat exchange system; wherein the electric energy required by the operation of the pumping equipment is provided by excess electric energy generated by the wind-solar power generation subsystem; excess electric energy generated by the wind and light power generation subsystem is absorbed by the hot dry rock power generation subsystem in a liquid swallowing and steam discharging mode, and hot steam after heat exchange with hot dry rock is utilized for power generation, so that the defect that the capacity of the wind and light power generation subsystem is insufficient is overcome.

Description

Technical Field

[0001] The present invention belongs to the field of new energy technology, and in particular relates to a multi-energy power generation system based on deep geothermal energy and an operation method thereof. Background Art

[0002] In the current energy field, wind and solar power generation systems have made significant progress as a renewable energy solution; however, traditional wind and solar power generation systems have some inherent problems, mainly concentrated on their unstable power generation characteristics; due to changes in weather conditions, the electricity generated by wind and solar power generation systems often fluctuates, resulting in unstable power supply and difficulty in meeting the real-time needs of the power grid; at the same time, the energy consumption caused by excess electricity and the impact of power shortages cannot be underestimated; therefore, the processing of excess electricity and supplementary electricity during power shortages have become challenges facing the current system. Summary of the invention

[0003] In response to the technical problems existing in the prior art, the present invention provides a multi-energy power generation system based on deep geothermal energy and an operation method thereof, so as to solve the technical problems that the existing wind and solar power generation systems have unstable power supply and are difficult to meet the real-time needs of the power grid.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: The present invention provides a multi-energy power generation system based on deep geothermal energy, including a wind and solar power generation subsystem and a hot dry rock power generation subsystem; The wind and solar power generation subsystem is used to convert wind energy or solar energy into electrical energy; The dry hot rock power generation electronic system includes an artificial heat reservoir, a production well, a coaxial casing heat exchange system, a pumping device, a steam power generation device and a liquid storage tank; The artificial heat reservoir is arranged in a hot dry rock formation; the mining well is arranged in the artificial heat reservoir and extends to the surface; the coaxial casing heat exchange system is arranged in the mining well, and the bottom of the coaxial casing heat exchange system is in direct contact with the artificial heat reservoir; The pumping device is used to pressurize and transport the liquid phase heat exchange medium into the coaxial tube heat exchange system, and enter the artificial heat reservoir through the coaxial tube heat exchange system; wherein the liquid phase heat exchange medium can exchange heat with the artificial heat reservoir to form hot steam, and the electric energy required for the operation of the pumping device is provided by the excess electric energy generated by the wind and solar power generation subsystem; The steam power generation equipment is used to convert the energy in the hot steam into electrical energy. After the energy conversion, the hot steam condenses to form a liquid-phase heat exchange medium; the liquid storage tank is used to store the liquid-phase heat exchange medium.

[0005] Furthermore, the liquid phase heat exchange medium is water containing nano magnetic fluid particles; wherein the nano magnetic fluid particles are suspended in water.

[0006] Furthermore, the nano magnetic fluid particles are nano ferroferric oxide coated with a surfactant.

[0007] Furthermore, the hot dry rock generator system also includes an electromagnetic instrument; The electromagnetic instrument is arranged at the bottom of the coaxial sleeve heat exchange system and is used to form a magnetic field environment in the artificial heat reservoir.

[0008] Furthermore, the electric energy required for the operation of the electromagnetic instrument is provided by the excess electric energy generated by the wind and solar power generation subsystem.

[0009] Furthermore, it also includes a magnetic fluid collector; The inlet of the magnetic fluid collector is connected to the steam outlet of the coaxial sleeve heat exchange system, and is used to collect and store the nano magnetic fluid particles in the hot steam.

[0010] Furthermore, the electric energy required for the operation of the magnetic fluid collector is provided by the excess electric energy generated by the wind and solar power generation subsystem.

[0011] Furthermore, the outlet of the magnetic fluid collector is connected to the inlet of the liquid storage tank; wherein the liquid storage tank is arranged near the wellhead of the mining well and buried underground.

[0012] Furthermore, the hot dry rock power generation subsystem also includes a pressure relief valve; the pressure relief valve is arranged between the steam outlet of the coaxial sleeve heat exchange system and the steam inlet of the steam power generation equipment.

[0013] The present invention also provides an operating method of a multi-energy power generation system based on deep geothermal energy, comprising: When the electricity generated by the wind and solar power generation subsystem is insufficient, the pressurized delivery of the liquid phase heat exchange medium into the coaxial tube heat exchange system is stopped; then, the coaxial tube heat exchange system is controlled to perform a depressurization and release operation to deliver the hot steam to the steam power generation equipment, and the steam power generation equipment is used to convert the energy in the hot steam into electrical energy; When the wind and solar power generation subsystem generates excess electricity, the excess electricity generated by the wind and solar power generation subsystem is used to drive the pumping equipment to pressurize the liquid heat exchange medium and transport it to the coaxial shell and tube heat exchange system. The liquid heat exchange medium enters the artificial heat reservoir through the coaxial shell and tube heat exchange system to exchange heat with the artificial heat reservoir.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a multi-energy power generation system based on deep geothermal energy and an operation method thereof, which combines a wind-solar power generation subsystem with a hot dry rock power generation subsystem, utilizes the hot dry rock power generation subsystem to store energy and generate electricity, and forms a multi-energy cooperative power generation system with the wind-solar power generation subsystem for peak shifting regulation; wherein, in the hot dry rock power generation subsystem, the excess electric energy generated by the wind-solar power generation subsystem is consumed by swallowing liquid and exhaling steam, and the hot steam after heat exchange with the hot dry rock is used to generate electricity, so as to make up for the insufficient production capacity of the wind-solar power generation subsystem; specifically, the excess electric energy generated by the wind-solar power generation subsystem is used to drive the pumping equipment in the hot dry rock power generation subsystem to operate, so as to transfer the liquid phase heat exchange medium The excess electricity generated in the wind and solar power generation systems is then used in situ by pressurizing it and transporting it to the artificial heat reservoir of the hot dry rock power generation system, thereby achieving the effect of energy storage. Secondly, heat energy is exchanged with the artificial heat reservoir by means of a liquid heat exchange medium to form hot steam, and when the electricity generated by the wind and solar power generation systems is insufficient, the hot steam is used to generate electricity, thereby achieving the effective extraction and utilization of the deep geothermal energy stored in the hot dry rocks. The system structure and operation control process of the present invention are simple, and the deep geothermal energy of the hot dry rocks is used in situ for energy storage without the need for additional battery packs, which makes up for the instability of wind and solar power generation and enhances the heat exchange problem of deep geothermal energy development.

[0015] Furthermore, water containing nano-magnetic fluid particles is used as a liquid-phase heat exchange medium, in which the nano-magnetic fluid particles are suspended in water. The nano-magnetic fluid particles exhibit strong rotation and translation characteristics to generate micro-eddies and shear forces, thereby increasing the overall mixing degree and uniformity of the liquid-phase heat exchange medium; secondly, the movement of the nano-magnetic fluid particles will drive the surrounding water molecules to move together, thereby promoting the exchange and mixing of substances in the liquid; in addition, since the surface energy of the nano-magnetic fluid particles is relatively high, it is easy to adsorb the surrounding liquid molecules, thereby driving the surrounding fluid to generate local micro-convection. The nano-magnetic fluid particles in the liquid-phase heat exchange medium affect the arrangement and movement behavior of the surrounding liquid molecules through their inherent crystal properties and small-scale effects, making the liquid-phase heat exchange medium The heat conduction law is obviously different from that of conventional single-phase liquids, which significantly increases the thermal conductivity of nanomagnetic fluid particles, thereby improving the heat conduction efficiency; the suspended particles in the liquid phase heat exchange medium are subjected to the action of Brownian force, thermal diffusion and other forces to make irregular micro-movements, and the irregular micro-movements enhance the energy transfer process between the liquid and the particles, and enhance the convective heat transfer; the existence of micro-convection makes the heat transfer in the fluid more rapid and efficient; the liquid phase heat exchange medium has both the fluidity of liquid and the magnetism of solid magnetic materials, so its flow direction and speed can be controlled by an external magnetic field; the flow properties of the liquid phase heat exchange medium can be improved due to the presence of nanoparticles, such as reducing flow resistance, changing the viscosity of the fluid, and improving flow stability.

[0016] Furthermore, an electromagnetic instrument is arranged at the bottom of the coaxial sleeve heat exchange system, and a magnetic field environment is formed in the artificial heat reservoir by using the electromagnetic instrument. When an external positive magnetic field is applied to the nano-magnetic fluid particles by using the magnetic field environment, the dragging effect of the magnetic field on the nano-magnetic fluid particles expands the local micro-convection effect to a wider range of the flow field. The relatively dispersed nano-magnetic fluid particles that originally tend to the central heat reservoir are dragged by the Kelvin force, pushing the liquid phase heat exchange medium and the surrounding high-temperature rock mass to gather and form a local high-density area. Due to the high temperature gradient in the near-wall area, a large number of nano-magnetic fluid particles are disturbed in the near-wall area, and the disturbance can promote heat exchange more than in the central area. At the same time, it can drive the water in the liquid phase heat exchange medium to penetrate deep into the formation to extract more heat energy. Subsequently, a negative magnetic field is applied by the electromagnetic instrument, and the effect of the magnetic field is used to make the deep nano-magnetic fluid particles play a drainage role, and the underground deep heat source is guided to the upper heat reservoir through the artificially fractured heat flow channel, thereby improving the heat extraction effect.

[0017] Furthermore, a magnetic fluid collector is used to collect nano magnetic fluid particles in the hot steam, thereby preventing the nano magnetic fluid particles from entering the steam power generation equipment, thereby ensuring the reliable operation of the steam power generation equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the multi-energy power generation system based on deep geothermal energy described in the present invention.

[0019] Among them, 1 wind and solar power generation subsystem, 2 artificial heat reservoir, 3 production well, 4 coaxial casing heat exchange system, 5 pumping equipment, 6 electromagnetic instrument, 7 steam power generation equipment, 8 liquid storage tank, 9 magnetic fluid collector, 10 pressure relief valve. DETAILED DESCRIPTION

[0020] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0021] As attached Figure 1As shown, the present invention provides a multi-energy power generation system based on deep geothermal energy, including a wind-solar power generation subsystem 1 and a hot dry rock power generation subsystem; the wind-solar power generation subsystem 1 is used to convert wind energy or solar energy into electrical energy; the hot dry rock power generation subsystem is used to utilize the excess electrical energy generated by the wind-solar power generation subsystem 1 to pressurize and transport the liquid-phase heat exchange medium to the inside of the hot dry rock formation, and exchange heat with the hot dry rock formation to form hot steam; at the same time, the energy of the hot steam can be converted into electrical energy to make up for the insufficient production capacity of the wind-solar power generation subsystem 1; wherein the liquid-phase heat exchange medium adopts water containing nano-magnetic fluid particles, namely Fe3O4 / DI-water nano-magnetic fluid; it should be noted that Fe3O4 / DI-water nano-magnetic fluid is a nano-magnetic fluid based on Fe3O4 and deionized water (DI-water), and is a magnetic material with unique physical and chemical properties; wherein the nano-magnetic fluid particles are suspended in water; preferably, the nano-magnetic fluid particles are nano-ferroferric oxide coated with a surfactant.

[0022] The dry hot rock power generation electronic system includes an artificial heat reservoir 2, a production well 3, a coaxial casing heat exchange system 4, a pumping device 5, an electromagnetic instrument 6, a steam power generation device 7, a liquid storage tank 8, a magnetic fluid collector 9 and a pressure relief valve 10.

[0023] The artificial heat reservoir 2 is arranged in a hot dry rock formation, and the production well 3 is arranged in the artificial heat reservoir 2; wherein, the wellhead of the production well 3 extends to the surface, and the bottom of the production well 3 extends into the artificial heat reservoir 2; the coaxial casing heat exchange system 4 is arranged in the production well 3, and the bottom of the coaxial casing heat exchange system 4 is in direct contact with the artificial heat reservoir 2; the pumping equipment 5 is used to pressurize and transport the liquid heat exchange medium to the coaxial casing heat exchange system 4, and enter the artificial heat reservoir 2 through the coaxial casing heat exchange system 4; wherein, the liquid heat exchange medium can exchange heat with the artificial heat reservoir 2 to form hot steam, and the electric energy required for the operation of the pumping equipment 5 is provided by the excess electric energy generated by the wind and solar power generation subsystem 1; preferably, the pumping equipment 5 is arranged at the wellhead of the production well 3 and is connected to the top of the coaxial casing heat exchange system 4.

[0024] The electromagnetic instrument 6 is arranged at the bottom of the coaxial sleeve heat exchange system 4, and is used to form a magnetic field environment in the artificial heat reservoir 2; wherein, the electric energy required for the operation of the electromagnetic instrument 6 is provided by the excess electric energy generated by the wind and solar power generation subsystem 1; the steam power generation equipment 7 is used to convert the energy in the hot steam into electric energy, and after the energy conversion, the hot steam condenses to form a liquid-phase heat exchange medium; the liquid storage tank 8 is used to store the liquid-phase heat exchange medium; wherein, the liquid storage tank 8 is arranged near the wellhead of the mining well 3 and buried underground.

[0025] The inlet of the magnetic fluid collector 9 is connected to the steam outlet of the coaxial sleeve heat exchange system 4, and is used to collect and store the nano magnetic fluid particles in the hot steam; the outlet of the magnetic fluid collector 9 is connected to the inlet of the liquid storage tank 8, and is used to add the nano magnetic fluid particles stored in the magnetic fluid collector 9 to the liquid storage tank 8; wherein, the electric energy required for the operation of the magnetic fluid collector 9 is provided by the excess electric energy generated by the wind and solar power generation subsystem 1; the pressure relief valve 10 is arranged between the steam outlet of the coaxial sleeve heat exchange system 4 and the steam inlet of the steam power generation equipment 7.

[0026] Working principle and how it works: The operating method of the multi-energy power generation system based on deep geothermal energy of the present invention is as follows: When the electricity generated by the wind-solar power generation subsystem 1 is insufficient, the pressurized delivery of the liquid phase heat exchange medium into the coaxial tube heat exchange system 4 is stopped; then, the coaxial tube heat exchange system 4 is controlled to perform a depressurization and release operation to deliver the hot steam to the steam power generation equipment 7, and the steam power generation equipment 7 is used to convert the energy in the hot steam into electrical energy; When the wind-solar power generation subsystem 1 generates excess electricity, the excess electricity generated by the wind-solar power generation subsystem 1 is used to drive the pumping equipment 5 to operate, so as to pressurize the liquid-phase heat exchange medium and transport it into the coaxial shell and tube heat exchange system 4, and then enter the artificial heat reservoir 2 through the coaxial shell and tube heat exchange system 4, so that the liquid-phase heat exchange medium can exchange heat with the artificial heat reservoir 2.

[0027] Specifically, the operating principle of the multi-energy power generation system based on deep geothermal energy is as follows: During the shutdown of the wind and solar power generation subsystem, the electromagnetic instrument 6 is turned off. At this time, the Fe3O4 / DI-water nano-magnetic fluid is out of the control of the magnetic field and only relies on its own physical properties to enhance the heat exchange effect; at the same time, the injection of liquid phase heat exchange medium into the coaxial sleeve heat exchange system 4 is stopped, and the pressure reduction and release operation is performed using the pressure relief valve; at this time, the fully heat-exchanged water will form high-pressure water vapor in the process of high temperature and pressure reduction, and the steam outlet of the coaxial heat exchange system 4 is kept connected to the steam inlet of the steam power generation equipment 7 to collect the released water vapor, and then use the released water vapor to perform steam power generation to compensate for the instability of wind and solar power generation during the shutdown of the wind and solar power generation subsystem.

[0028] A liquid storage tank 8 is constructed on the ground to collect water discharged from the steam power generation equipment 7. When the wind-solar power generation subsystem 1 has excess production capacity, the excess electric energy of the wind-solar power generation subsystem 1 is utilized through the pumping equipment 5 to pressurize the water in the liquid storage tank 8 and transport it to the artificial thermal reservoir 2. Preferably, the excess electric energy is utilized to heat the liquid phase heat exchange medium through an additional electric heating system. The heated and pressurized liquid phase heat exchange medium is injected into the deep formation for storage, forming a high-temperature steam reserve area, thereby converting the excess electric energy into thermal energy for storage.

[0029] In addition, in order to reduce the injection pressure of the liquid phase heat exchange medium, an electromagnetic instrument 6 is set up to form a magnetic field environment in the artificial heat reservoir 2, so as to use nano magnetic fluid particles to guide water into the deep formation, thereby achieving the purpose of reducing the injection pressure.

[0030] It should be noted that in the hot dry rock power generation subsystem, liquid phase heat exchange medium is injected after formation fracturing, and steam is generated at high temperature, thereby driving the steam turbine to generate electricity; based on the injection and production of liquid phase heat exchange medium, continuous energy generation can be maintained, so that the excess electric energy of the wind and solar power generation subsystem can be consumed by swallowing water and spitting steam; hot dry rock is used as an energy storage carrier, eliminating various problems caused by the influence of various inevitable factors of wind and solar power generation, and truly realizing the peak-shaving system; Fe3O4 / DI-water nanomagnetic fluid is introduced in the hot dry rock fracturing process; nanomagnetic fluid particles are used to exhibit strong rotation and translation characteristics when suspended in the fracturing fluid, and the nanoparticles have high surface energy and are easy to adsorb surrounding liquid molecules, thereby driving the surrounding fluid to produce local micro-convection, thereby showing a significant enhancement effect.

[0031] In the present invention, an electromagnetic instrument is deployed at the bottom of the well. When the wind and solar power generation equipment is operating normally, the magnetic field generated by it can be used for magnetic field magnetization. First, an external positive magnetic field is applied to the nano-magnetic fluid. The dragging effect of this magnetic field on the nano-particles expands the local micro-convection effect to a wider range of the flow field. The relatively dispersed nano-particles that originally tend to the central heat reservoir are dragged by the Kelvin force, which pushes the fracturing fluid and the surrounding high-temperature rock mass to gather and form a local high-density area. The temperature gradient near the wall is high, and a large number of particles are disturbed in the near-wall area. Such disturbance can promote heat exchange more than in the central area. At the same time, it carries water deep into the formation and extracts more heat energy from here. Subsequently, a negative magnetic field is applied by the electromagnetic instrument. The effect of the magnetic field is used to make the deep nano-magnetic fluid play a drainage role, and the deep underground heat source is guided to the upper heat reservoir through the heat flow channel of artificial fracturing, thereby improving the heat extraction effect.

[0032] It should be noted that, unlike other geothermal resources that can be directly mined and utilized, hot dry rock resources need to rely on the Enhanced Geothermal System (EGS) to be mined, that is, by constructing an artificial heat reservoir in the low-permeability hot dry rock strata, and using a heat extraction medium to exchange heat with the heat reservoir, the heat energy contained in the hot dry rock can be effectively extracted; however, the steam injection process after the hot dry rock is fracturing is often difficult, and the application of magnetic fluid can greatly reduce the difficulty of injection.

[0033] The multi-energy power generation system based on deep geothermal energy described in the present invention combines a wind-solar power generation subsystem with a dry hot rock power generation subsystem under the background of combining wind-solar power generation and dry hot rock deep geothermal resources; wherein, the dry hot rock power generation subsystem exploits deep geothermal resources by combining an enhanced geothermal system with a coaxial sleeve heat exchange system; in the coaxial sleeve heat exchange system, the bottom of the coaxial sleeve is in an open state, and is directly connected to an artificial heat reservoir with a complex fracture network system in the deep formation, forming a stable fluid circulation heat exchange process; in order to enhance the heat exchange effect, in this fluid circulation heat exchange system, an electromagnetic instrument is arranged at the bottom of the coaxial sleeve to apply a strong magnetic field to the Fe3O4 / DI-water nanomagnetic fluid; secondly, a magnetic fluid collector is arranged to collect the nanomagnetic fluid to prevent the nanomagnetic fluid particles from entering the steam power generation equipment, thereby ensuring the reliable operation of the steam power generation equipment; by establishing a liquid storage tank on the surface of the formation, the liquid storage tank is used to store underground high-temperature steam for condensed water after power generation.

[0034] In the present invention, the wind-solar power generation subsystem and the hot dry rock power generation subsystem are combined to form a multi-energy coordinated stable power generation system, which makes up for the instability of wind-solar power generation; by utilizing the geothermal energy contained in the underground high-temperature heat storage of hot dry rocks for energy storage on site, there is no need to add additional battery packs; specifically, in the hot dry rock power generation subsystem, excess electric energy is used to drive pumping equipment to pressurize the liquid phase heat exchange medium containing nano-magnetic fluid particles into the artificial heat reservoir to exchange heat with the hot dry rocks to form hot steam; the system not only realizes the energy storage of excess electric energy generated by the wind-solar power generation subsystem, but also provides additional power support through the power generation of hot steam when the wind-solar power generation is insufficient, thereby achieving the dual functions of energy storage and power generation.

[0035] Secondly, under the action of a strong magnetic field, the magnetic fluid can carry the heat exchange medium to a deeper level in the formation. By changing the positive and negative poles of the magnetic field, the deeper heat source can be transported to the vicinity of the coaxial heat exchange tube through the heat exchange medium, thereby obtaining the maximum amount of heat exchange. When the wind and solar power generation subsystem is short of electricity due to unavoidable factors, the hot steam stored in the artificial heat reservoir is released for power generation to achieve stable operation of the power generation system. In addition, the application of nano-magnetic fluid particles can regulate the distribution and movement of particles through a magnetic field, further optimize the heat exchange process, and transport the deeper heat source to the upper heat reservoir and the vicinity of the coaxial heat exchange tube through the heat exchange medium. Then, according to the actual needs of the system, the flow rate and flow of the heat exchange medium are reasonably adjusted to reduce pumping energy consumption and fluid resistance, thereby reducing energy loss in the heat exchange process. During the heat exchange process, the system will also use heat recovery technology to recover part of the waste heat and reuse it in the system to improve the overall energy efficiency of the system.

[0036] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention.

Claims

1. A multi-energy power generation system based on deep geothermal energy, characterized in that: Including wind and solar power generation subsystem (1) and hot dry rock power generation subsystem; The wind-solar power generation subsystem (1) is used to convert wind energy or solar energy into electrical energy; The dry hot rock power generation electronic system comprises an artificial heat reservoir (2), a production well (3), a coaxial casing heat exchange system (4), a pumping device (5), a steam power generation device (7) and a liquid storage tank (8); The artificial heat reservoir (2) is arranged in a hot dry rock formation; the production well (3) is arranged in the artificial heat reservoir (2) and extends to the surface; the coaxial casing heat exchange system (4) is arranged in the production well (3), and the bottom of the coaxial casing heat exchange system (4) is in direct contact with the artificial heat reservoir (2); The pumping device (5) is used to pressurize and transport the liquid phase heat exchange medium to the coaxial tube heat exchange system (4), and enter the artificial heat reservoir (2) through the coaxial tube heat exchange system (4); wherein the liquid phase heat exchange medium can exchange heat with the artificial heat reservoir (2) to form hot steam, and the electric energy required for the operation of the pumping device (5) is provided by the excess electric energy generated by the wind and solar power generation subsystem (1); The steam power generation equipment (7) is used to convert the energy in the hot steam into electrical energy, and after the energy conversion, the hot steam is condensed to form a liquid phase heat exchange medium; the liquid storage tank (8) is used to store the liquid phase heat exchange medium.

2. A multi-energy power generation system based on deep geothermal energy according to claim 1, characterized in that: The liquid phase heat exchange medium is water containing nano magnetic fluid particles; wherein the nano magnetic fluid particles are suspended in water.

3. A multi-energy power generation system based on deep geothermal energy according to claim 2, characterized in that: The nano magnetic fluid particles are nano ferroferric oxide coated with a surfactant.

4. A multi-energy power generation system based on deep geothermal energy according to claim 2, characterized in that: The hot dry rock electric power generation system further comprises an electromagnetic instrument (6); The electromagnetic instrument (6) is arranged at the bottom of the coaxial tube-in-tube heat exchange system (4) and is used to form a magnetic field environment in the artificial heat reservoir (2).

5. A multi-energy power generation system based on deep geothermal energy according to claim 4, characterized in that: The electric energy required for the operation of the electromagnetic instrument (6) is provided by the excess electric energy generated by the wind and solar power generation subsystem (1).

6. A multi-energy power generation system based on deep geothermal energy according to claim 2, characterized in that: Also includes a magnetic fluid collector (9); The inlet of the magnetic fluid collector (9) is connected to the steam outlet of the coaxial sleeve heat exchange system (4) and is used to collect and store the nano magnetic fluid particles in the hot steam.

7. A multi-energy power generation system based on deep geothermal energy according to claim 6, characterized in that: The electric energy required for the operation of the magnetic fluid collector (9) is provided by the excess electric energy generated by the wind and solar power generation subsystem (1).

8. The multi-energy power generation system based on deep geothermal energy according to claim 6 is characterized in that: The outlet of the magnetic fluid collector (9) is connected to the inlet of the liquid storage tank (8); wherein the liquid storage tank (8) is arranged near the wellhead of the mining well (3) and buried underground.

9. The multi-energy power generation system based on deep geothermal energy according to claim 1 is characterized in that: The dry hot rock power generation subsystem further comprises a pressure relief valve (10); the pressure relief valve (10) is arranged between the steam outlet of the coaxial sleeve heat exchange system (4) and the steam inlet of the steam power generation equipment (7).

10. The method for operating a multi-energy power generation system based on deep geothermal energy according to any one of claims 1 to 9, characterized in that: include: When the wind and solar power generation subsystem (1) generates insufficient electrical energy, the pressurized delivery of the liquid phase heat exchange medium into the coaxial tube heat exchange system (4) is stopped; then, the coaxial tube heat exchange system (4) is controlled to perform a pressure reduction and release operation to deliver the hot steam to the steam power generation equipment (7), and the steam power generation equipment (7) is used to convert the energy in the hot steam into electrical energy; When the wind-solar power generation subsystem (1) generates excess electric energy, the excess electric energy generated by the wind-solar power generation subsystem (1) is used to drive the pumping device (5) to operate, so as to pressurize the liquid phase heat exchange medium and transport it into the coaxial tube heat exchange system (4), and then enter the artificial heat reservoir (2) through the coaxial tube heat exchange system (4), so that the liquid phase heat exchange medium and the artificial heat reservoir (2) can exchange heat.

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