Novel energy-saving geothermal heating system and heating method

Abstract

The invention provides a novel energy-saving geothermal heating system and method, and relates to the technical field of geothermal energy heating, the system comprises a geothermal well, the heat exchange section of the geothermal well is located in an underground hydrothermal heat reservoir, and the inlet end and the outlet end of the geothermal well are communicated with the two ends of the heat exchange section respectively; the input end and the output end of the first pipe are respectively communicated with the outlet end and the inlet end; the carbon dioxide trapping device is arranged between the heat exchange device and the compression device, the output end of the carbon dioxide trapping device is communicated with the first pipe, and carbon dioxide in the supercritical state has the high evaporation latent heat characteristic and is large in density, low in viscosity, low in price and stable in chemical property; the refrigerant is simple in structure and more sensitive to temperature and pressure changes, has good heat exchange capacity as an underground circulating heat exchange working medium, can save cost and protect the environment compared with expensive refrigerants in the market, and is suitable for large-scale underground circulating heat exchange.

Description

Technical Field

[0001] The present invention belongs to the technical field of geothermal heating, and more specifically, relates to a novel energy-saving geothermal heating system and a heating method. Background Art

[0002] Geothermal resources are typical representatives of green, renewable clean energy. Their large reserves, wide distribution, good stability and high utilization coefficient make them very competitive among the clean energy currently available. Medium-deep hydrothermal resources are generally between 200 meters and 3,000 meters underground, and the temperature is generally between 50℃ and 150℃. Due to the high direct utilization rate of hydrothermal geothermal resources, they are currently the main target of global geothermal energy development and utilization. However, the large-scale exploitation of medium-deep hydrothermal resources will lead to a series of problems such as groundwater level decline, surface subsidence, and wellhead blockage. Therefore, the development and utilization of medium-deep hydrothermal geothermal resources has begun to develop in the direction of "taking heat but not water". However, the circulating working fluid of the current underground circulation heat exchange technology is mainly water, and the heat exchange effect is poor, which cannot meet the heating requirements. Summary of the invention

[0003] The purpose of the present invention is to provide a new energy-saving geothermal heating system and heating method to address the shortcomings of the existing technology, so as to solve the problem raised in the above background technology that the circulating working fluid of the current underground circulating heat exchange technology is mainly water, the heat exchange effect is poor, and it cannot meet the heating requirements.

[0004] In order to achieve the above object, the present invention provides a novel energy-saving geothermal heating system, which comprises:

[0005] A geothermal well, wherein the heat exchange section of the geothermal well is located in an underground hydrothermal heat reservoir, and the inlet and outlet ends of the geothermal well are respectively connected to the two ends of the heat exchange section;

[0006] a first tube, wherein an input end and an output end of the first tube are respectively connected to the outlet end and the inlet end;

[0007] A heat exchange device, a compression device and a cooling device are sequentially arranged along the flow direction of the heat exchange fluid in the first tube and are connected to the first tube, and the heat exchange device is used to communicate with the heating pipeline system of the building facility;

[0008] A carbon dioxide capture device is provided between the heat exchange device and the compression device, an output end of the carbon dioxide capture device is connected to the first pipe, and the heat exchange fluid is carbon dioxide captured from the air by the carbon dioxide capture device.

[0009] Preferably, the novel energy-saving geothermal heating system further comprises two pump bodies, one of which is arranged between the heat exchange device and the compression device and is connected to the first pipe, and the other pump body is arranged between the compression device and the cooling device and is connected to the first pipe.

[0010] Preferably, the novel energy-saving geothermal heating system further comprises a throttle valve, which is arranged between the outlet end and the heat exchange device and is connected to the first pipe.

[0011] Preferably, one end of the input section and one end of the output section of the geothermal well are respectively connected to the inlet end and the outlet end, and the other end of the input section and the other end of the output section of the geothermal well are respectively connected to the two ends of the heat exchange section, and the input section, the output section and the heat exchange section form a U-shaped geothermal well.

[0012] Preferably, the well walls of the input section and the output section are covered with a heat insulating layer.

[0013] Preferably, the cooling device comprises:

[0014] A cooling tower, wherein the side walls of the cooling tower are provided with a plurality of air inlets, the top of the cooling tower is provided with an air outlet, the upper side wall of the cooling tower is provided with a cooling water inlet, and the lower side wall of the cooling tower is provided with a cooling water outlet;

[0015] a second pipe, the second pipe being spiral-shaped, the second spiral pipe being arranged in the cooling tower, the input end of the second spiral pipe passing through the upper side wall of the cooling tower and being communicated with the output end of the first pipe, the output end of the second spiral pipe passing through the bottom end of the cooling tower and being communicated with the inlet end;

[0016] A spray assembly is arranged in the cooling tower and above the second spiral tube, and an input end of the spray assembly is communicated with the cooling water inlet.

[0017] Preferably, the cooling device further comprises a gas-water separator, and the gas-water separator is arranged in the cooling tower and above the spray assembly.

[0018] Preferably, the tube wall of the input end of the second spiral tube is covered with a heat insulation layer.

[0019] Preferably, the compression device is a compressor, and the heat exchange device is a heat exchanger.

[0020] A novel energy-saving geothermal heating method, using the novel energy-saving geothermal heating system, comprises:

[0021] The carbon dioxide is transported into the compression device to increase the temperature and pressure so that the carbon dioxide approaches a supercritical state;

[0022] The heated and pressurized carbon dioxide is transported into the cooling device for cooling to make the carbon dioxide reach a supercritical state;

[0023] transporting carbon dioxide in a supercritical state into the geothermal well, so that the carbon dioxide in the supercritical state generates heat exchange with the hydrothermal heat storage underground;

[0024] The carbon dioxide automatically overflowed after the heat exchange is transported into the heat exchange device to generate heat exchange with the heating fluid of the heating pipeline system;

[0025] The cooled carbon dioxide is transported into the compression device for the next set of cyclic heat exchange.

[0026] The present invention provides a novel energy-saving geothermal heating system and heating method, which has the following beneficial effects: a carbon dioxide capture device of the system is arranged between a heat exchange device and a compression device, an output end of the carbon dioxide capture device is connected to a first pipe, the carbon dioxide capture device can capture carbon dioxide in the air, when the carbon dioxide capture amount is sufficient, the carbon dioxide capture device can be closed, when the compression device is started, the captured carbon dioxide can be transported into the compression device, and the temperature and pressure are increased, so that the carbon dioxide approaches a supercritical state, the heated and pressurized carbon dioxide is cooled when being transported into a cooling device, so that the temperature of the carbon dioxide is reduced to below its saturation temperature, the carbon dioxide will reach a supercritical state, the carbon dioxide in the supercritical state can flow into the geothermal well by its own gravity, and when entering the heat exchange section of the geothermal well, the supercritical carbon dioxide It will produce heat exchange with the hydrothermal heat storage. The carbon dioxide after the heat exchange will overflow from the outlet of the geothermal well. The overflowing carbon dioxide gas is transported to the ground heat exchange device to provide heating for the building facilities. The carbon dioxide cooled in the heat exchange device is then transported to the compressor for the next set of cyclic heat exchange. Since carbon dioxide in the supercritical state has a strong latent heat of evaporation, high density, low viscosity, low price, relatively stable chemical properties, and is sensitive to changes in temperature and pressure, it has good heat exchange capacity as an underground circulating heat exchange medium and can meet heating requirements. It is a very high-quality underground circulating heat exchange medium. At the same time, the required carbon dioxide can be collected directly in the air by relying on a carbon dioxide capture device. Compared with the expensive refrigerants on the market, it can save costs and is suitable for large-scale underground circulating heat exchange.

[0027] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present invention.

[0029] Figure 1 A flowchart showing a novel energy-saving geothermal heating system and heating method according to an embodiment of the present invention is shown;

[0030] Figure 2 It shows a main structural schematic diagram of a novel energy-saving geothermal heating system and heating method according to an embodiment of the present invention;

[0031] Figure 3 A schematic diagram of the main structure of a cooling device of a novel energy-saving geothermal heating system and heating method according to an embodiment of the present invention is shown.

[0032] Description of reference numerals:

[0033] 1. Building facilities; 2. Heat exchange device; 3. Compression device; 4. Cooling device; 41. Cooling tower; 42. Air inlet; 43. Air outlet; 44. Cooling water outlet; 45. Second pipe; 46. Spray assembly; 47. Gas-water separator; 5. Carbon dioxide capture device; 6. First pipe; 7. Pump body; 8. Throttle valve; 9. Geothermal well; 91. Heat exchange section; 92. Input section; 93. Output section; 10. Hydrothermal heat storage; 11. Insulation layer; 12. Shallow stratum. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0035] The present invention provides a novel energy-saving geothermal heating system, which comprises:

[0036] A geothermal well, wherein the heat exchange section of the geothermal well is located in an underground hydrothermal heat reservoir, and the inlet and outlet ends of the geothermal well are respectively connected to the two ends of the heat exchange section;

[0037] A first tube, wherein the input end and the output end of the first tube are respectively connected to the outlet end and the inlet end;

[0038] The heat exchange device, the compression device and the cooling device are sequentially arranged along the flow direction of the heat exchange fluid in the first tube and are connected to the first tube. The heat exchange device is used to be connected to the heating pipeline system of the building facility.

[0039] A carbon dioxide capture device is provided between the heat exchange device and the compression device, an output end of the carbon dioxide capture device is connected to the first pipe, and the heat exchange fluid is carbon dioxide captured from the air by the carbon dioxide capture device.

[0040] Specifically, in order to solve the problem that the circulating working fluid of the current underground circulating heat exchange technology is mainly water, the heat exchange effect is poor, and the heating requirement cannot be met, the present invention provides a novel energy-saving geothermal heating system, the compression device of the system can be a compressor, the heat exchange device of the system can be a heat exchanger, the carbon dioxide capture device of the system is arranged between the heat exchange device and the compression device, the output end of the carbon dioxide capture device is connected to the first pipe, the carbon dioxide capture device can capture carbon dioxide in the air, when the carbon dioxide capture amount is sufficient, the carbon dioxide capture device can be closed, the captured carbon dioxide can be transported into the compression device when the compression device is started, and the temperature and pressure are increased to make the carbon dioxide close to the supercritical state, the heated and pressurized carbon dioxide is cooled when it is transported into the cooling device, so that the temperature of the carbon dioxide is reduced to below its saturation temperature, the carbon dioxide will reach the supercritical state, and the carbon dioxide in the supercritical state can flow through its own gravity After entering the geothermal well, when entering the heat exchange section of the geothermal well, the supercritical carbon dioxide will exchange heat with the hydrothermal heat storage. The carbon dioxide after heat exchange will overflow from the outlet of the geothermal well. The overflowing carbon dioxide gas is transported to the ground heat exchange device to heat the building facilities. The carbon dioxide cooled in the heat exchange device is then transported to the compressor for the next set of circulating heat exchange. Since supercritical carbon dioxide has a strong latent heat of evaporation, high density, low viscosity, low price, relatively stable chemical properties, and is sensitive to changes in temperature and pressure, it has good heat exchange capacity as an underground circulating heat exchange medium and can meet heating requirements. It is a very high-quality underground circulating heat exchange medium. At the same time, the required carbon dioxide can be collected directly in the air near the factory by relying on a carbon dioxide capture device. Compared with the expensive refrigerants on the market, it can save costs and protect the environment. It is suitable for large-scale underground circulating heat exchange.

[0041] Preferably, the new energy-saving geothermal heating system also includes two pump bodies, one of which is arranged between the heat exchange device and the compression device and connected to the first pipe, and the other pump body is arranged between the compression device and the cooling device and connected to the first pipe.

[0042] Specifically, the captured carbon dioxide can be discharged into a compression device through one of the pump bodies to increase the temperature and pressure, so that the carbon dioxide approaches a critical state. The heated and pressurized carbon dioxide can be discharged into a cooling device through another pump body for cooling, so that the temperature of the carbon dioxide is reduced to below its saturation temperature, and the carbon dioxide will reach a supercritical state.

[0043] Preferably, the novel energy-saving geothermal heating system further comprises a throttle valve, which is arranged between the outlet end and the heat exchange device and is connected to the first pipe.

[0044] Specifically, the carbon dioxide gas overflowing from the outlet of the geothermal well is controlled by a throttle valve and discharged into the ground heat exchange device to heat the building facilities. Since the flow rate and pressure of the carbon dioxide after absorbing heat are unstable when overflowing from the outlet of the geothermal well, the throttle valve is needed to control the flow rate and pressure of the overflowed high-temperature carbon dioxide injected into the heat exchange device to ensure the safe operation of the system;

[0045] After releasing heat in the heat exchange device, carbon dioxide is injected into the compression device again through one of the pump bodies for the next cycle of heat exchange without the need to provide new working fluid again, thus achieving energy-saving and environmental protection.

[0046] Preferably, one end of the input section and one end of the output section of the geothermal well are connected to the inlet end and the outlet end respectively, and the other end of the input section and the other end of the output section of the geothermal well are connected to the two ends of the heat exchange section respectively, and the input section, the output section and the heat exchange section form a U-shaped geothermal well.

[0047] Specifically, the input section and output section of the geothermal well are located in the shallow strata underground, and the heat exchange section of the geothermal well is located in the hydrothermal heat reservoir in the medium-deep strata;

[0048] During periods of time when heating is not needed, such as in summer, hydrothermal heat storage in medium and deep strata can quickly restore the temperature around the heat exchange section of the geothermal well, ensuring the subsequent continuous operation of the system.

[0049] Preferably, the well walls of the input section and the output section are covered with a heat insulating layer.

[0050] Specifically, the insulating layer may be glass fiber, asbestos or other materials that can perform an insulating function, and can prevent heat exchange between carbon dioxide and shallow formations during the injection and production phase.

[0051] Preferably, the cooling device comprises:

[0052] A cooling tower, wherein the side walls of the cooling tower are provided with a plurality of air inlets, the top of the cooling tower is provided with an air outlet, the upper side wall of the cooling tower is provided with a cooling water inlet, and the lower side wall of the cooling tower is provided with a cooling water outlet;

[0053] A second pipe, the second pipe is spiral-shaped, and the spiral-shaped second pipe is arranged in the cooling tower. The input end of the spiral-shaped second pipe passes through the upper side wall of the cooling tower and is connected with the output end of the first pipe. The output end of the spiral-shaped second pipe passes through the bottom end of the cooling tower and is connected with the inlet end.

[0054] A spray assembly is arranged in the cooling tower and above the spiral second pipe, and an input end of the spray assembly is connected to a cooling water inlet;

[0055] An air-water separator is arranged in the cooling tower and above the spray assembly.

[0056] Specifically, the heated and pressurized carbon dioxide is injected into the spiral part of the second tube in the cooling tower through the input end of the second tube, and the air inlet and the spray assembly are opened to cool the carbon dioxide in the spiral part of the second tube to a supercritical state, and the hot air after heat exchange is discharged through the air-water separator and the air outlet above the cooling tower, and the cooling water after heat exchange is discharged and recovered from the cooling water outlet below the cooling tower;

[0057] After being cooled by the cooling tower, carbon dioxide reaches a supercritical state. Since carbon dioxide in a supercritical state has a higher density, the input end of the second pipe in the cooling tower is higher than the outlet end of the geothermal well, which can produce a siphon effect in the geothermal well, so that carbon dioxide in a supercritical state is injected into the geothermal well by gravity, and after heat exchange with the hydrothermal heat storage in the geothermal well, it overflows from the outlet end of the geothermal well by itself, saving the electricity consumption required for injection and production.

[0058] Preferably, the tube wall of the input end of the spiral second tube is covered with a heat insulation layer.

[0059] Specifically, the heat insulation layer forms a heat insulation channel, which can prevent the cooled carbon dioxide from undergoing secondary heat exchange with the cooling water below the cooling tower.

[0060] A novel energy-saving geothermal heating method, using a novel energy-saving geothermal heating system, characterized in that it includes:

[0061] The carbon dioxide is transported into a compression device to increase the temperature and pressure, so that the carbon dioxide approaches a supercritical state;

[0062] The heated and pressurized carbon dioxide is transported into a cooling device for cooling to make the carbon dioxide reach a supercritical state;

[0063] The supercritical carbon dioxide is transported into the geothermal well, so that the supercritical carbon dioxide and the underground hydrothermal heat storage produce heat exchange;

[0064] The carbon dioxide automatically overflowed after heat exchange is transported into the heat exchange device to generate heat exchange with the heating fluid of the heating pipeline system;

[0065] The cooled carbon dioxide is transported to the compression device for the next set of cycle heat exchange.

[0066] Embodiment 1

[0067] like Figure 2 and Figure 3 As shown, the present invention provides a new energy-saving geothermal heating system, which includes:

[0068] A geothermal well 9, wherein a heat exchange section 91 of the geothermal well 9 is located in an underground hydrothermal heat storage 10, and an inlet end and an outlet end of the geothermal well 9 are respectively connected to two ends of the heat exchange section 91;

[0069] A first tube 6, wherein the input end and the output end of the first tube 6 are connected to the outlet end and the inlet end respectively;

[0070] The heat exchange device 2, the compression device 3 and the cooling device 4 are sequentially arranged along the flow direction of the heat exchange fluid in the first pipe 6 and are connected to the first pipe 6. The heat exchange device 2 is used to communicate with the heating pipeline system of the building facility 1;

[0071] The carbon dioxide capture device 5 is arranged between the heat exchange device 2 and the compression device 3. The output end of the carbon dioxide capture device 5 is connected to the first pipe 6. The heat exchange fluid is the carbon dioxide captured by the carbon dioxide capture device 5 from the air.

[0072] In this embodiment, the new energy-saving geothermal heating system also includes two pump bodies 7, one of which is arranged between the heat exchange device 2 and the compression device 3 and connected to the first pipe 6, and the other pump body 7 is arranged between the compression device 3 and the cooling device 4 and connected to the first pipe 6.

[0073] In this embodiment, the novel energy-saving geothermal heating system further includes a throttle valve 8 , which is disposed between the outlet end and the heat exchange device 2 and is connected to the first pipe 6 .

[0074] In this embodiment, one end of the input section 92 and one end of the output section 93 of the geothermal well 9 are connected to the inlet end and the outlet end respectively, and the other end of the input section 92 and the other end of the output section 93 of the geothermal well 9 are connected to the two ends of the heat exchange section 91 respectively, and the input section 92, the output section 93 and the heat exchange section 91 form a U-shaped geothermal well.

[0075] In this embodiment, the input section 92 and the output section 93 of the geothermal well 9 are located in the shallow stratum 12 underground, and the heat exchange section 91 of the geothermal well 9 is located in the hydrothermal heat storage 10 in the medium-deep stratum.

[0076] In this embodiment, the walls of the input section 92 and the output section 93 are covered with a heat insulating layer 11 .

[0077] In this embodiment, the cooling device 4 includes:

[0078] A cooling tower 41, wherein a plurality of air inlets 42 are distributed on the side wall of the cooling tower 41, an air outlet 43 is disposed at the top of the cooling tower 41, a cooling water inlet 43 is disposed on the upper side wall of the cooling tower 41, and a cooling water outlet 44 is disposed on the lower side wall of the cooling tower 41;

[0079] The second pipe 45 is spiral-shaped and is disposed in the cooling tower 41. The input end of the spiral-shaped second pipe 45 passes through the upper side wall of the cooling tower 41 and is connected to the output end of the first pipe 6. The output end of the spiral-shaped second pipe 45 passes through the bottom end of the cooling tower 41 and is connected to the inlet end.

[0080] The spray assembly 46 is disposed in the cooling tower 41 and above the spiral second pipe 45 . The input end of the spray assembly 46 is communicated with the cooling water inlet 43 .

[0081] In this embodiment, the cooling device further includes a gas-water separator 47 , which is disposed in the cooling tower 41 and above the spray assembly 46 .

[0082] In this embodiment, the tube wall of the input end of the spiral second tube 45 is covered with a heat insulation layer.

[0083] In this embodiment, the compression device 3 is a compressor, and the heat exchange device 2 is a heat exchanger.

[0084] Embodiment 2

[0085] like Figure 1 As shown, a novel energy-saving geothermal heating method uses a novel energy-saving geothermal heating system, including:

[0086] The carbon dioxide is transported into the compression device 3 to increase the temperature and pressure so that the carbon dioxide approaches a supercritical state;

[0087] The heated and pressurized carbon dioxide is transported into the cooling device 4 for cooling to make the carbon dioxide reach a supercritical state;

[0088] The supercritical carbon dioxide is transported into the geothermal well 9, so that the supercritical carbon dioxide and the underground hydrothermal heat storage 10 generate heat exchange;

[0089] The carbon dioxide automatically overflowed after the heat exchange is transported into the heat exchange device 2 to generate heat exchange with the heating fluid of the heating pipeline system;

[0090] The cooled carbon dioxide is transported to the compression device 3 for the next set of cycle heat exchange.

[0091] In summary, the implementation process of the novel energy-saving geothermal heating method of the present invention using the novel energy-saving geothermal heating system is as follows:

[0092] The first step is to open the carbon dioxide capture device 5 to capture carbon dioxide in the air. The carbon dioxide capture device 5 is suitable for being installed near a factory with a large amount of carbon dioxide exhaust emissions. When the carbon dioxide capture amount is sufficient, the carbon dioxide capture device 5 can be closed;

[0093] In the second step, the captured carbon dioxide can be discharged into the compressor through one of the pump bodies 7 to increase the temperature and pressure, so that the carbon dioxide is close to the critical state;

[0094] In the third step, the heated and pressurized carbon dioxide can be discharged into the cooling tower 41 by another pump body 7, and the temperature of the carbon dioxide in the spiral part of the second tube 45 is reduced to below its saturation temperature by air cooling and evaporation, and the carbon dioxide will reach a supercritical state;

[0095] In the fourth step, the carbon dioxide in the supercritical state can flow into the U-shaped geothermal well 9 by its own gravity. The well walls of the input section 92 and the output section 93 of the geothermal well 9 in the shallow stratum 12 are covered with an insulating layer 11 to ensure that the phase of the carbon dioxide in the supercritical state will not change. After entering the heat exchange section 91 of the geothermal well 9, the carbon dioxide in the supercritical state will exchange heat with the hydrothermal heat storage 10. Since the outlet end of the geothermal well 9 is lower than the input end of the second pipe 45 in the cooling tower 41, the carbon dioxide after heat exchange can overflow from the outlet end of the geothermal well 9 by itself due to the siphon effect.

[0096] In the fifth step, the overflowed carbon dioxide gas is controlled by the throttle valve 8 and discharged into the ground heat exchanger to heat the building facilities;

[0097] In the sixth step, the carbon dioxide gas after heat exchange and cooling is discharged into the compressor through one of the pump bodies 7 to perform the next set of cyclic heat exchange.

[0098] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A new energy-saving geothermal heating system, characterized in that: The system includes: A geothermal well, wherein the heat exchange section of the geothermal well is located in an underground hydrothermal heat reservoir, and the inlet and outlet ends of the geothermal well are respectively connected to the two ends of the heat exchange section; a first tube, wherein an input end and an output end of the first tube are respectively connected to the outlet end and the inlet end; A heat exchange device, a compression device and a cooling device are sequentially arranged along the flow direction of the heat exchange fluid in the first tube and are connected to the first tube, and the heat exchange device is used to communicate with the heating pipeline system of the building facility; A carbon dioxide capture device is provided between the heat exchange device and the compression device, an output end of the carbon dioxide capture device is connected to the first pipe, and the heat exchange fluid is carbon dioxide captured from the air by the carbon dioxide capture device.

2. A new energy-saving geothermal heating system according to claim 1, characterized in that: The novel energy-saving geothermal heating system also includes two pump bodies, one of which is arranged between the heat exchange device and the compression device and connected to the first pipe, and the other pump body is arranged between the compression device and the cooling device and connected to the first pipe.

3. A new energy-saving geothermal heating system according to claim 1, characterized in that: The novel energy-saving geothermal heating system further comprises a throttle valve, which is arranged between the outlet end and the heat exchange device and is connected to the first pipe.

4. A new energy-saving geothermal heating system according to claim 1, characterized in that: One end of the input section and one end of the output section of the geothermal well are respectively connected to the inlet end and the outlet end, and the other end of the input section and the other end of the output section of the geothermal well are respectively connected to the two ends of the heat exchange section, and the input section, the output section and the heat exchange section form a U-shaped geothermal well.

5. A new energy-saving geothermal heating system according to claim 4, characterized in that: The well walls of the input section and the output section are covered with a heat insulating layer.

6. A new energy-saving geothermal heating system according to claim 1, characterized in that: The cooling device comprises: A cooling tower, wherein the side walls of the cooling tower are provided with a plurality of air inlets, the top of the cooling tower is provided with an air outlet, the upper side wall of the cooling tower is provided with a cooling water inlet, and the lower side wall of the cooling tower is provided with a cooling water outlet; a second pipe, the second pipe being spiral-shaped, the second spiral pipe being arranged in the cooling tower, the input end of the second spiral pipe passing through the upper side wall of the cooling tower and being communicated with the output end of the first pipe, the output end of the second spiral pipe passing through the bottom end of the cooling tower and being communicated with the inlet end; A spray assembly is arranged in the cooling tower and above the second spiral tube, and an input end of the spray assembly is communicated with the cooling water inlet.

7. A new energy-saving geothermal heating system according to claim 6, characterized in that: The cooling device also includes a gas-water separator, which is arranged in the cooling tower and above the spray assembly.

8. A new energy-saving geothermal heating system according to claim 6, characterized in that: The tube wall of the input end of the spiral second tube is covered with a heat insulation layer.

9. A new energy-saving geothermal heating system according to claim 1, characterized in that: The compression device is a compressor, and the heat exchange device is a heat exchanger.

10. A novel energy-saving geothermal heating method, using a novel energy-saving geothermal heating system according to any one of claims 1 to 9, characterized in that: include: The carbon dioxide is transported into the compression device to increase the temperature and pressure so that the carbon dioxide approaches a supercritical state; The heated and pressurized carbon dioxide is transported into the cooling device for cooling to make the carbon dioxide reach a supercritical state; transporting carbon dioxide in a supercritical state into the geothermal well, so that the carbon dioxide in the supercritical state generates heat exchange with the hydrothermal heat storage underground; The carbon dioxide automatically overflowed after the heat exchange is transported into the heat exchange device to generate heat exchange with the heating fluid of the heating pipeline system; The cooled carbon dioxide is transported into the compression device for the next set of cyclic heat exchange.

Images