Light-ultrasonic-geothermal coupling combined energy supply system and method

Abstract

The invention provides a light-ultrasonic-geothermal coupling combined energy supply system and method, and relates to the technical field of comprehensive utilization of renewable energy sources. The system comprises a light condensation and heat collection unit, an organic Rankine cycle power generation unit, a photo-thermal energy storage unit, a geothermal energy heat exchange and storage unit and a heating unit. According to the light-ultrasonic-geothermal coupling combined energy supply system, solar energy and geothermal energy can be utilized for thermal power generation and resident heating, the energy supply modes are diversified, the utilization efficiency of the geothermal energy is improved, waste of geothermal resources is reduced, the problems that single medium-low temperature geothermal energy is low in power generation efficiency and insufficient in energy grade decline are solved, and the energy utilization rate is increased. And the problems of discontinuity, instability and high cost of single solar power generation are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of comprehensive utilization of renewable energy, and in particular to a light-ultrasound-geothermal coupling combined energy supply system and method. Background Art

[0002] The development and utilization of clean energy can effectively reduce the consumption proportion of fossil energy such as coal and oil, thereby reducing pollution and damage to the environment. It can also promote energy diversification, reduce dependence on a single energy source, and improve the stability and security of energy supply. With the continuous advancement of technology and the continuous reduction of costs, geothermal energy and solar energy, as renewable clean energy, will have a broader application prospect. The Qinghai-Tibet Plateau is rich in renewable energy such as geothermal energy and solar energy, which is of great significance to improving the local energy structure, reducing carbon emissions, and promoting sustainable development.

[0003] At present, there are problems such as insufficient energy utilization and low utilization efficiency in the development and utilization of geothermal energy and solar energy. Single solar power generation has the disadvantages of discontinuity, instability and high cost; single medium and low temperature geothermal power generation has the problems of low efficiency, waste of geothermal resources and insufficient energy quality decline; the combined use of medium and low temperature geothermal energy and solar energy has the problem of complex system and difficulty in efficient coordination. Summary of the invention

[0004] The purpose of the present invention is to provide a light-ultrasound-geothermal coupling combined energy supply system and method, which can improve the utilization efficiency of geothermal energy and reduce the waste of geothermal resources. It can not only overcome the problems of low efficiency and insufficient energy quality decline of single medium and low temperature geothermal energy power generation, but also overcome the problems of discontinuity, instability and high cost of single solar power generation. It can also overcome the problems of complex system and difficulty in efficient collaborative work in existing geothermal energy and solar energy combined utilization technologies.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: The light-ultrasound-geothermal coupled energy supply system includes a concentrated solar collector unit and an organic Rankine cycle power generation unit; The concentrating heat collecting unit is used to collect solar energy heat, and comprises a trough heat collector, a second valve, a first organic heat-conducting medium pump, and a first circulation pipeline. The trough heat collector, the second valve, and the first organic heat-conducting medium pump are connected in a loop in sequence through the first circulation pipeline, and the first circulation pipeline is filled with the first organic heat-conducting medium; The organic Rankine cycle power generation unit is used for thermal power generation, and includes a superheater, an evaporator, a steam turbine, a generator, a condenser, a second organic heat-conducting medium pump, and a second circulation pipeline. The evaporator, the superheater, the steam turbine, the condenser, and the second organic heat-conducting medium pump are connected in a loop in sequence through the second circulation pipeline. The second circulation pipeline is filled with a second organic heat-conducting medium. The steam turbine is connected to the generator, and the steam turbine drives the generator to generate electricity. The hot side medium inlet on the superheater is connected to the second valve through the first circulation pipeline, the hot side medium outlet on the superheater is connected to the hot side medium inlet on the evaporator through the first circulation pipeline, and the hot side medium on the superheater is connected to the inlet of the first organic heat conductive medium pump through the first circulation pipeline.

[0006] Furthermore, there are multiple trough collectors, and the multiple trough collectors are arranged in series or in parallel.

[0007] Furthermore, the optical-ultrasound-geothermal coupling combined energy supply system also includes a photothermal energy storage unit, which includes a third valve, a multi-temperature heat storage tank, and a first organic heat conductive medium heat storage pipeline. The multi-temperature heat storage tank includes a tank body, and a first partition and a second partition are arranged inside the tank body. The first partition and the second partition divide the tank body from top to bottom into three cavities, and the three cavities are filled with high-temperature heat storage materials, medium-temperature heat storage materials, and low-temperature heat storage materials, respectively. A first organic heat conductive medium heat exchange pipe running through the three cavities is arranged in the tank body, and both ends of the first organic heat conductive medium heat exchange pipe are respectively connected to a first organic heat conductive medium inlet and a first organic heat conductive medium outlet arranged on the tank body, the first organic heat conductive medium inlet is connected to the third valve outlet through the first organic heat conductive medium heat storage pipeline, the third valve inlet is connected to the second valve outlet through the first organic heat conductive medium heat storage pipeline, and the first organic heat conductive medium outlet is connected to the first organic heat conductive medium pump inlet through the first organic heat conductive medium heat storage pipeline.

[0008] Furthermore, the optical-ultrasound-geothermal coupling combined energy supply system also includes a geothermal heat exchange and heat storage unit, which includes a preheater, a lifting water pump, a geothermal water supply pipe, a geothermal water return pipe, and a geothermal heat storage pipeline. The preheater includes a shell, a second organic heat conductive medium heat exchange pipe is arranged in the shell, and a cold side outlet, a cold side inlet, a hot side outlet, and a hot side inlet are arranged on the shell. The two ends of the second organic heat conductive medium heat exchange pipe are respectively connected to the cold side outlet and the cold side inlet, and the hot side inlet is connected to the geothermal water supply pipe. The lower end of the geothermal water supply pipe extends The multi-temperature heat storage tank body is provided with a geothermal water inlet, and the geothermal water supply pipe is provided with a lifting water pump, and the hot side outlet is connected to the water inlet of the geothermal heat storage pipeline. The geothermal heat storage pipeline is provided with a fifth valve, a circulating water pump, and a first valve in sequence. The water outlet of the geothermal heat storage pipeline is connected to the geothermal water inlet provided on the multi-temperature heat storage tank body, and the geothermal water return pipe is connected to the geothermal water outlet provided on the multi-temperature heat storage tank body. The geothermal water return pipe extends into the geothermal well. The multi-temperature heat storage tank body is also provided with a geothermal water heat exchange pipe running through the three cavities, and the two ends of the geothermal water heat exchange pipe are respectively connected to the geothermal water outlet and the geothermal water inlet.

[0009] Furthermore, a sediment treatment device for filtering and removing sediment impurities in the geothermal water is also provided on the geothermal water supply pipe, and the sediment treatment device is located upstream of the lifting water pump.

[0010] Furthermore, an ultrasonic device is also provided inside the shell of the preheater.

[0011] Furthermore, the optical-ultrasound-geothermal coupling combined energy supply system also includes a heating unit for providing heating to residents, the heating unit includes a fourth valve, a user heater, and a heating circulation pipeline, the fourth valve and the user heater are sequentially arranged on the heating circulation pipeline, and both ends of the heating circulation pipeline are respectively connected to a heating water outlet and a heating water inlet arranged on the multi-temperature heat storage tank body, a heating water heat exchange pipe is also provided in the lowest cavity in the multi-temperature heat storage tank body, and both ends of the heating water heat exchange pipe are respectively connected to the heating water outlet and the heating water inlet, and the heating circulation pipeline is filled with heating water.

[0012] Furthermore, the geothermal water heat exchange tube, the first organic heat conductive medium heat exchange tube, the heating water heat exchange tube, and the second organic heat conductive medium heat exchange tube respectively adopt a serpentine tube or a spiral tube structure.

[0013] The present invention also provides a light-ultrasound-geothermal coupling combined energy supply method, which uses the above-mentioned light-ultrasound-geothermal coupling combined energy supply system for combined energy supply, including: controlling the above-mentioned concentrating and collecting units, photothermal energy storage units, and geothermal energy heat exchange and storage units to respectively provide combined energy to the organic Rankine cycle power generation unit and the heating unit, thereby realizing thermal power generation and user heating.

[0014] Compared with the prior art, the beneficial technical effects of the present invention are: The light-ultrasound-geothermal coupling combined energy supply system of the present invention can utilize solar energy and geothermal energy for thermal power generation and residential heating, and has various energy supply modes, which not only improves the utilization efficiency of geothermal energy, but also reduces the waste of geothermal resources. It not only overcomes the problems of low efficiency and insufficient energy quality decline of single medium and low temperature geothermal energy power generation, but also overcomes the problems of discontinuity, instability and high cost of single solar power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the optical-ultrasound-geothermal coupling combined energy supply system of the present invention; Figure 2 for Figure 1 Schematic diagram of the internal structure of the medium and multi-temperature heat storage tank; Figure 3 for Figure 1 Schematic diagram of the internal structure of the middle preheater; Figure numerals: 1-trough collector, 2-first circulation pipeline, 3-first valve, 4-second valve, 5-first organic heat-conducting medium pump, 6-third valve, 7-multi-temperature heat storage tank, 701-geothermal water inlet, 702-geothermal water outlet, 703-geothermal water heat exchange pipe, 704-first organic heat-conducting medium inlet, 705-first organic heat-conducting medium outlet, 706-first organic heat-conducting medium heat exchange pipe, 707-heating water outlet, 708-heating water inlet, 709-heating water heat exchange pipe, 710-first partition, 711-second partition, 712-high-temperature heat storage material, 713-medium-temperature heat storage material Material, 714-low-temperature heat storage material, 8-the fourth valve, 9-geothermal water return pipe, 10-user heater, 11-circulating water pump, 12-superheater, 13-evaporator, 14-fifth valve, 15-steam turbine, 16-generator, 17-condenser, 18-second organic heat transfer medium pump, 19-second circulation pipeline, 20-preheater, 201-cold side outlet, 202-second organic heat transfer medium heat exchange tube, 203-ultrasonic device, 204-cold side inlet, 205-hot side outlet, 206-hot side inlet, 21-lifting water pump, 22-sediment treatment device, 23-geothermal water supply pipe. DETAILED DESCRIPTION

[0016] The technical solutions of the present invention will be described clearly and completely below in conjunction with embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0017] Example 1 Please see attached Figure 1-3 As shown, the optical-ultrasound-geothermal coupled combined energy supply system provided in this embodiment includes a concentrating heat collection unit and an organic Rankine cycle power generation unit; The concentrating heat collection unit is used to collect solar heat, and includes a trough collector 1, a second valve 4, a first organic heat-conducting medium pump 5, and a first circulation pipeline 2. The trough collector 1, the second valve 4, and the first organic heat-conducting medium pump 5 are connected in a loop in sequence through the first circulation pipeline 2, and the first circulation pipeline 2 is filled with a first organic heat-conducting medium; The organic Rankine cycle power generation unit is used for thermal power generation, and includes a superheater 12, an evaporator 13, a steam turbine 15, a generator 16, a condenser 17, a second organic heat-conducting medium pump 18, and a second circulation pipeline 19. The evaporator 13, the superheater 12, the steam turbine 15, the condenser 17, and the second organic heat-conducting medium pump 18 are connected in a loop in sequence through the second circulation pipeline 19. The second circulation pipeline 19 is filled with a second organic heat-conducting medium. The steam turbine 15 is connected to the generator 16, and the steam turbine 15 drives the generator 16 to generate electricity. The hot side medium inlet on the superheater 12 is connected to the second valve 4 through the first circulation pipeline 2, the hot side medium outlet on the superheater 12 is connected to the hot side medium inlet on the evaporator 13 through the first circulation pipeline 2, and the hot side medium on the superheater 12 is connected to the inlet of the first organic heat conductive medium pump 5 through the first circulation pipeline 2.

[0018] Specifically, there are multiple trough collectors 1, and the multiple trough collectors 1 are arranged in series or in parallel.

[0019] In this embodiment, a plurality of trough collectors 1 are arranged in series, and the trough collector 1 is mainly used for collecting solar heat. The trough collector 1 realizes the conversion of light energy into heat energy through focusing, reflection and absorption, so that the first organic heat-conducting medium reaches a certain temperature. The trough collector 1 belongs to the category of medium and high temperature collectors, and can make the first organic heat-conducting medium reach a higher temperature. The first organic heat-conducting medium can adopt organic heat-conducting oil, such as diphenylethylene, diphenylsilicon oxide, diphenylethylene, diphenylmethane, and alkylbenzene type, alkylnaphthalene type, alkylbiphenyl type, and biphenyl and diphenyl ether low-melting mixture type heat-conducting oil. The second valve 4 is used to control the flow speed of the first organic heat-conducting medium in the trough collector 1. The first circulation pipeline 2 and the second circulation pipeline 19 both use high temperature and corrosion-resistant pipe fittings. The second organic heat-conducting medium can adopt organic working fluids such as alkanes, alcohols, ketones, such as n-butane, isobutane, ethyl chloride, etc. The superheater 12 is used to heat the second organic heat-conducting medium saturated steam into superheated steam, and the evaporator 13 is used to evaporate the second organic heat-conducting medium to generate steam. The steam turbine 15 is used to convert thermal energy into mechanical energy. The high-temperature superheated steam drives the steam turbine 15 to convert thermal energy into mechanical energy.

[0020] The optical-ultrasound-geothermal coupling combined energy supply system of this embodiment is suitable for the case where only solar energy is used for energy supply and the light is insufficient. When the light energy collected by the trough collector 1 is only enough to meet the heating of the superheater 12 and the temperature of the evaporator 13 to vaporize it, the second valve 4 is opened. The first organic heat-conducting medium pump 5 is controlled to operate to promote the flow of the first organic heat-conducting medium in the first circulation pipeline 2. The first organic heat-conducting medium first flows into the trough collector 1. The trough collector 1 collects heat energy in sunlight and transfers the heat energy to the first organic heat-conducting medium through the connected first circulation pipeline 2. The first organic heat-conducting medium passes through the superheater 12 to heat the saturated steam of the second organic heat-conducting medium into superheated steam at a certain temperature, and then passes through the evaporator 13 for heat exchange to heat and vaporize the second organic heat-conducting medium to complete the cycle; the second organic heat-conducting medium in the second circulation pipeline 19 is promoted to flow by the second organic heat-conducting medium pump 18, passes through the evaporator 13 and the superheater 12 successively to form high-temperature superheated steam, and then drives the steam turbine 15 to work, and then passes through the condenser 17 to complete the cycle, and the steam turbine 15 drives the generator 16 to work to convert mechanical energy into electrical energy.

[0021] Example 2 On the basis of Example 1, the optical-ultrasound-geothermal coupling combined energy supply system also includes a photothermal energy storage unit, which includes a third valve 6, a multi-temperature heat storage tank 7, and a first organic heat conductive medium heat storage pipeline. The multi-temperature heat storage tank 7 includes a tank body, and a first partition 710 and a second partition 711 are arranged inside the tank body. The first partition 710 and the second partition 711 divide the tank body from top to bottom into three cavities, and the three cavities are filled with high-temperature heat storage material 712, medium-temperature heat storage material 713, and low-temperature heat storage material 714, respectively. The tank body is provided with three partitions running through it. The first organic heat conductive medium heat exchange tube 706 of the cavity, both ends of the first organic heat conductive medium heat exchange tube 706 are respectively connected to the first organic heat conductive medium inlet 704 and the first organic heat conductive medium outlet 705 arranged on the tank body, the first organic heat conductive medium inlet 704 is connected to the outlet of the third valve 6 through the first organic heat conductive medium heat storage pipeline, the inlet of the third valve 6 is connected to the outlet of the second valve 4 through the first organic heat conductive medium heat storage pipeline, and the first organic heat conductive medium outlet 705 is connected to the inlet of the first organic heat conductive medium pump 5 through the first organic heat conductive medium heat storage pipeline.

[0022] In this embodiment, the second valve 4 is used to control the flow rate of the first organic heat-conducting medium flowing out of the trough collector 1 , and the third valve 6 is used to control the flow rate of the first organic heat-conducting medium flowing into the multi-temperature heat storage tank 7 .

[0023] The optical-ultrasonic-geothermal coupling combined energy supply system of this embodiment is suitable for situations where only solar energy is used for energy supply and there is sufficient sunlight. The light energy collected by the trough collector 1 not only meets the heating of the superheater 12 and the temperature increase of the evaporator 13 to vaporize it, but also has excess energy. On the basis of Example 1, the second valve 4 is kept open, and the third valve 6 is opened. A part of the first organic heat-conducting medium continues to exchange heat with the second organic heat-conducting medium in the evaporator 13 and the superheater 12 to complete the heat exchange cycle, and another part of the first organic heat-conducting medium enters the multi-temperature heat storage tank 7, and exchanges heat with the high-temperature heat storage material 712, the medium-temperature heat storage material 713, and the low-temperature heat storage material 714 in turn to complete the heat storage cycle.

[0024] Example 3 On the basis of Example 2, the optical-ultrasound-geothermal coupling combined energy supply system also includes a geothermal heat exchange and heat storage unit, which includes a preheater 20, a lifting water pump 21, a geothermal water supply pipe 23, a geothermal water return pipe 9, and a geothermal heat storage pipeline. The preheater 20 includes a shell, and a second organic heat conductive medium heat exchange pipe 202 is arranged in the shell. A cold side outlet 201, a cold side inlet 204, a hot side outlet 205, and a hot side inlet 206 are arranged on the shell. The two ends of the second organic heat conductive medium heat exchange pipe 202 are respectively connected to the cold side outlet 201 and the cold side inlet 204, and the hot side inlet 206 is connected to the geothermal water supply pipe 23. The geothermal water supply pipe The lower end of 23 extends into the geothermal well, a lifting water pump 21 is arranged on the geothermal water supply pipe 23, the hot side outlet 205 is connected to the water inlet end of the geothermal heat storage pipeline, and the fifth valve 14, the circulating water pump 11 and the first valve 3 are arranged on the geothermal heat storage pipeline in sequence, the water outlet end of the geothermal heat storage pipeline is connected to the geothermal water inlet 701 arranged on the tank body of the multi-temperature heat storage tank 7, the geothermal water return pipe 9 is connected to the geothermal water outlet 702 arranged on the tank body of the multi-temperature heat storage tank 7, the geothermal water return pipe 9 extends into the geothermal well, and the multi-temperature heat storage tank 7 is also provided with a geothermal water heat exchange pipe 703 running through the three cavities, and the two ends of the geothermal water heat exchange pipe 703 are respectively connected to the geothermal water outlet 702 and the geothermal water inlet 701.

[0025] In this embodiment, the first valve 3 and the fifth valve 14 are both used to control the flow rate of geothermal water entering the multi-temperature heat storage tank 7 .

[0026] Specifically, the geothermal water supply pipe 23 is also provided with a sediment processing device 22 for filtering and removing sediment impurities in the geothermal water. The sediment processing device 22 is located upstream of the lifting water pump 21 .

[0027] In this embodiment, the sediment treatment device 22 can be selected from one or more of a quartz sand filter, a multi-media filter, a bag filter, and a cyclone desander. According to the water quality of the geothermal well, including the sediment content, particle size, organic matter content, etc. in the geothermal water, a suitable filter type and filter medium can be selected.

[0028] Specifically, an ultrasonic device 203 is further provided inside the shell of the preheater 20. The ultrasonic device 203 includes an ultrasonic transducer and an ultrasonic generator. The ultrasonic transducer is provided inside the shell of the preheater 20. The ultrasonic transducer is electrically connected to the ultrasonic generator. The ultrasonic generator is provided inside or outside the shell of the preheater 20. Ultrasonic waves can enhance heat transfer and descaling, and improve the heat exchange efficiency of the preheater 20.

[0029] The optical-ultrasonic-geothermal coupling combined energy supply system of this embodiment is suitable for the situation of combined energy supply of optical energy and geothermal energy. On the basis of Example 2, the lifting water pump 21 extracts the geothermal water in the geothermal well, flows through the preheater 20 to exchange heat with the second organic heat conductive medium, preheats the second organic heat conductive medium, and then enters the multi-temperature heat storage tank 7, exchanges heat with the high-temperature heat storage material 712, the medium-temperature heat storage material 713, and the low-temperature heat storage material 714 in turn, and then returns to the geothermal well through the geothermal water return pipe 9; before the geothermal water flows through the preheater 20, the sediment treatment device 22 is used to remove sediment impurities, and when the geothermal water flows in the preheater 20, ultrasonic waves are used to enhance heat transfer and descaling.

[0030] In this embodiment, geothermal water completes geothermal energy storage by exchanging heat with the high-temperature heat storage material 712, the medium-temperature heat storage material 713, and the low-temperature heat storage material 714 in the multi-temperature heat storage tank 7. When the temperature of the first organic heat conductive medium flowing through the multi-temperature heat storage tank 7 is lower than the heat storage temperature of the high-temperature heat storage material 712, the medium-temperature heat storage material 713, and the low-temperature heat storage material 714, the high-temperature heat storage material 712, the medium-temperature heat storage material 713, and the low-temperature heat storage material 714 can transfer heat energy to the first organic heat conductive medium.

[0031] Example 4 On the basis of Example 3, the optical-ultrasound-geothermal coupling combined energy supply system also includes a heating unit for providing heating to residents, and the heating unit includes a fourth valve 8, a user heater 10, and a heating circulation pipeline. The fourth valve 8 and the user heater 10 are sequentially arranged on the heating circulation pipeline, and the two ends of the heating circulation pipeline are respectively connected to the heating water outlet 707 and the heating water inlet 708 arranged on the tank body of the multi-temperature heat storage tank 7. A heating water heat exchange pipe 709 is also provided in the bottom cavity in the tank body of the multi-temperature heat storage tank 7. The two ends of the heating water heat exchange pipe 709 are respectively connected to the heating water outlet 707 and the heating water inlet 708, and the heating circulation pipeline is filled with heating water.

[0032] Specifically, the geothermal water heat exchange pipe 703, the first organic heat conductive medium heat exchange pipe 706, the heating water heat exchange pipe 709, and the second organic heat conductive medium heat exchange pipe 202 respectively adopt a serpentine pipe or a spiral pipe structure.

[0033] In this embodiment, the geothermal water heat exchange pipe 703, the first organic heat conductive medium heat exchange pipe 706, the heating water heat exchange pipe 709, and the second organic heat conductive medium heat exchange pipe 202 all adopt a serpentine pipe structure to improve heat exchange efficiency.

[0034] The optical-ultrasonic-geothermal coupling combined energy supply system of this embodiment is applicable to the situation of combined energy supply of optical energy and geothermal energy. On the basis of embodiment 3, by opening the fourth valve 8, the heat energy stored in the low-temperature heat storage material 714 in the multi-temperature heat storage tank 7 is exchanged with the heating water flowing in the heating water heat exchange pipe 709, and the heating water flows through the user heater 10 to heat the user's home. In order to promote the flow of heating water, a heating circulation water pump 11 can be added to the heating circulation pipeline.

[0035] From the above description, it can be seen that the light-ultrasound-geothermal coupling combined energy supply system of the present invention has a variety of energy supply modes. Users can use different control methods to control the light-ultrasound-geothermal coupling combined energy supply system according to different actual needs, so that it can provide various combined supply modes to achieve thermal power generation and residential heating. The switching selection between different energy supply modes can be achieved manually or automatically.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the technical solution and conceptual invention of the present invention should be included in the protection scope of the present invention.

Claims

1. Light-ultrasound-geothermal coupling combined energy supply system, characterized by: It includes a concentrating solar collector unit and an organic Rankine cycle power generation unit; The concentrating heat collecting unit is used to collect solar energy heat, and comprises a trough heat collector, a second valve, a first organic heat-conducting medium pump, and a first circulation pipeline. The trough heat collector, the second valve, and the first organic heat-conducting medium pump are connected in a loop in sequence through the first circulation pipeline, and the first circulation pipeline is filled with the first organic heat-conducting medium; The organic Rankine cycle power generation unit is used for thermal power generation, and includes a superheater, an evaporator, a steam turbine, a generator, a condenser, a second organic heat-conducting medium pump, and a second circulation pipeline. The evaporator, the superheater, the steam turbine, the condenser, and the second organic heat-conducting medium pump are connected in a loop in sequence through the second circulation pipeline. The second circulation pipeline is filled with a second organic heat-conducting medium. The steam turbine is connected to the generator, and the steam turbine drives the generator to generate electricity. The hot side medium inlet on the superheater is connected to the second valve through the first circulation pipeline, the hot side medium outlet on the superheater is connected to the hot side medium inlet on the evaporator through the first circulation pipeline, and the hot side medium on the superheater is connected to the inlet of the first organic heat conductive medium pump through the first circulation pipeline.

2. The optical-ultrasound-geothermal coupling combined energy supply system according to claim 1 is characterized in that: There are multiple trough collectors, which are connected in series or in parallel.

3. The optical-ultrasound-geothermal coupled energy supply system according to claim 1 is characterized in that: It also includes a photothermal energy storage unit, which includes a third valve, a multi-temperature heat storage tank, and a first organic heat conductive medium heat storage pipeline. The multi-temperature heat storage tank includes a tank body, and a first partition and a second partition are arranged inside the tank body. The first partition and the second partition divide the tank body from top to bottom into three cavities, and the three cavities are filled with high-temperature heat storage materials, medium-temperature heat storage materials, and low-temperature heat storage materials, respectively. A first organic heat conductive medium heat exchange pipe running through the three cavities is arranged in the tank body, and both ends of the first organic heat conductive medium heat exchange pipe are respectively connected to a first organic heat conductive medium inlet and a first organic heat conductive medium outlet arranged on the tank body, the first organic heat conductive medium inlet is connected to the third valve outlet through the first organic heat conductive medium heat storage pipeline, the third valve inlet is connected to the second valve outlet through the first organic heat conductive medium heat storage pipeline, and the first organic heat conductive medium outlet is connected to the first organic heat conductive medium pump inlet through the first organic heat conductive medium heat storage pipeline.

4. The optical-ultrasound-geothermal coupled energy supply system according to claim 3 is characterized in that: It also includes a geothermal heat exchange and heat storage unit, which includes a preheater, a lifting water pump, a geothermal water supply pipe, a geothermal water return pipe, and a geothermal heat storage pipeline. The preheater includes a shell, a second organic heat conductive medium heat exchange pipe is arranged in the shell, a cold side outlet, a cold side inlet, a hot side outlet, and a hot side inlet are arranged on the shell, two ends of the second organic heat conductive medium heat exchange pipe are respectively connected to the cold side outlet and the cold side inlet, and the hot side inlet is connected to the geothermal water supply pipe. The lower end of the geothermal water supply pipe extends into the geothermal well. The geothermal water supply pipe A lifting water pump is arranged on the top, and the hot side outlet is connected to the water inlet end of the geothermal heat storage pipeline. The fifth valve, the circulating water pump and the first valve are arranged in sequence on the geothermal heat storage pipeline. The water outlet end of the geothermal heat storage pipeline is connected to the geothermal water inlet arranged on the multi-temperature heat storage tank body, and the geothermal water return pipe is connected to the geothermal water outlet arranged on the multi-temperature heat storage tank body. The geothermal water return pipe extends into the geothermal well. A geothermal water heat exchange pipe running through three cavities is also arranged in the multi-temperature heat storage tank body, and both ends of the geothermal water heat exchange pipe are respectively connected to the geothermal water outlet and the geothermal water inlet.

5. The optical-ultrasound-geothermal coupling combined energy supply system according to claim 4 is characterized in that: The geothermal water supply pipe is also provided with a sediment treatment device for filtering and removing sediment impurities in the geothermal water, and the sediment treatment device is located upstream of the lifting water pump.

6. The optical-ultrasound-geothermal coupled energy supply system according to claim 4 is characterized in that: An ultrasonic device is also provided inside the shell of the preheater.

7. The optical-ultrasound-geothermal coupled energy supply system according to claim 4 is characterized in that: It also includes a heating unit for providing heating for residents, the heating unit includes a fourth valve, a user heater, and a heating circulation pipeline, the fourth valve and the user heater are sequentially arranged on the heating circulation pipeline, the two ends of the heating circulation pipeline are respectively connected to the heating water outlet and the heating water inlet arranged on the multi-temperature heat storage tank body, a heating water heat exchange pipe is also provided in the bottom cavity in the multi-temperature heat storage tank body, the two ends of the heating water heat exchange pipe are respectively connected to the heating water outlet and the heating water inlet, and the heating circulation pipeline is filled with heating water.

8. The optical-ultrasound-geothermal coupled energy supply system according to claim 7 is characterized in that: The geothermal water heat exchange tube, the first organic heat conductive medium heat exchange tube, the heating water heat exchange tube, and the second organic heat conductive medium heat exchange tube respectively adopt a serpentine tube or a spiral tube structure.

9. The light-ultrasound-geothermal coupling combined energy supply method is characterized in that: The light-ultrasound-geothermal coupling combined energy supply system described in any one of claims 1 to 8 is used for combined energy supply, comprising: controlling the concentrated heat collection unit, the photothermal energy storage unit, and the geothermal heat exchange and storage unit to respectively provide combined energy to the organic Rankine cycle power generation unit and the heating unit.

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