An apparatus for exploiting a hot dry rock geothermal energy resource

Abstract

The application provides a dry hot rock geothermal energy resource exploitation device, and belongs to the technical field of geothermal energy exploitation.The device comprises a box, a filter assembly and a drainage assembly.The box is connected with a heat exchange device through a pipeline.The heat exchange device is connected with a water tank through a pipeline.The upper and lower ends of the box are respectively connected with a hollow pipe and a waste residue pipe.The hollow pipe is connected with an air inlet pipe.The filter assembly comprises a filter cartridge fixed in the box.The two ends of the filter cartridge are respectively connected with the hollow pipe and the waste residue pipe.The filter assembly further comprises a cleaning part and a residue discharging part.The drainage assembly comprises a partition plate fixed in the water tank.The partition plate divides the water tank into a water storage chamber and a transfer chamber.The filter assembly is arranged, so that the filter cartridge does not need to be replaced and manually cleaned, thereby reducing production cost and labor cost, and avoiding staff scalding.The drainage assembly is arranged, so that water is recycled, thereby avoiding resource waste.

Description

Technical Field

[0001] This invention belongs to the field of geothermal energy extraction technology, and particularly relates to an extraction device for dry hot rock geothermal energy resources. Background Technology

[0002] Hot dry rock, as an emerging geothermal energy source, has enormous development potential and broad application prospects. The total amount of hot dry rock resources in my country's land area is equivalent to 856 trillion tons of standard coal, which is 30 times the total amount of oil, gas and coal resources in China. Hot dry rock resources have huge potential and are expected to become an important alternative to fossil energy in the future. The traditional mining process of hot dry rock includes steps such as well drilling, water injection, rock fracturing, and collection of high-temperature water or steam.

[0003] A search revealed that Chinese Patent Publication No. CN216092442U discloses a filtration and diversion device for hot dry rock extracted water. This device effectively filters sand from the extracted water through a four-stage filter cartridge system. It enables continuous filtration and diversion without shutting down the machine. The spiral diversion function prevents sand accumulation on the pipe walls of subsequent equipment, avoids damage to ground-based equipment, and saves manpower and material costs in hot dry rock development.

[0004] The existing installation has the following shortcomings:

[0005] 1. The existing equipment is equipped with multiple filter elements. During the geothermal extraction of hot dry rock, the filter elements need to be replaced manually, which is a cumbersome operation with high labor and production costs. In addition, the filter elements are hot, and workers are at risk of being burned during the replacement process, posing a significant safety hazard.

[0006] 2. After replacing the filter element, the existing device requires manual cleaning to remove the sand and gravel before it can be used again. This process is inefficient and has high labor costs.

[0007] 3. Existing equipment cannot recycle the water after heat exchange. It is necessary to continuously inject water into the well through a booster pump to generate water vapor, which results in high mining costs and waste of resources. Summary of the Invention

[0008] The purpose of this invention is to solve the problems mentioned in the background art of the prior art, and to propose a device for the exploitation of dry hot rock geothermal energy resources.

[0009] To achieve the above objectives, the present invention adopts the following technical solution:

[0010] An extraction device for hot dry rock geothermal energy resources, comprising:

[0011] The box body is connected to a heat exchange device via a conduit, and the heat exchange device is connected to a water tank via a conduit. Hollow pipes and waste residue pipes are respectively connected to the upper and lower ends of the box body, and air inlet pipes are connected to the hollow pipes.

[0012] The filter assembly includes a filter cartridge fixed inside the housing, with both ends of the filter cartridge connected to a hollow tube and a waste residue tube, respectively. The filter assembly also includes a cleaning component and a slag discharge component.

[0013] A drainage assembly includes a partition fixed inside a water tank, the partition dividing the water tank into a storage chamber and a transfer chamber, an inlet pipe connecting the storage chamber and the transfer chamber on the partition, an outlet pipe connected to the transfer chamber, and a driving component.

[0014] Preferably, the cleaning component includes a rotating shaft that is rotatably connected to the filter cartridge and the hollow tube. The rotating shaft passes through the hollow tube and is connected to a motor via a coupling. The portion of the rotating shaft inside the filter cartridge has a reciprocating thread, and a scraper is threaded onto the reciprocating thread. The scraper is slidably connected to the filter cartridge.

[0015] Preferably, the scraper includes an annular plate, a limiting plate is fixed on the annular plate, the filter cylinder has a groove, the limiting plate is slidably connected in the groove, one end of the limiting plate passes through the filter cylinder, and the limiting plate has a threaded hole at the center of the annular plate, the threaded hole being adapted to the reciprocating thread on the rotating shaft.

[0016] Preferably, the slag discharge component includes a sleeve fixed to the bottom of the tank, a movable rod slidably connected inside the sleeve, a spring provided between the movable rod and the bottom of the sleeve, the two ends of the spring being fixedly connected to the movable rod and the sleeve respectively, an adjusting rod being fixed to the top of the movable rod through a connecting plate, the adjusting rod passing through the bottom of the tank and slidably connected to the tank, and a rack being fixed to the end of the adjusting rod outside the tank.

[0017] Preferably, the slag discharge component further includes a valve rotatably connected inside the waste slag pipe, a central shaft fixed on the valve, a gear fixed on the central shaft, and the gear meshing with a rack.

[0018] Preferably, the number of teeth on the rack is one-quarter of the number of teeth on the gear.

[0019] Preferably, the driving component includes an eccentric wheel fixed on a rotating shaft, an annular groove on the eccentric wheel, a vertical rod slidably connected in the annular groove, a connecting rod rotatably connected to the vertical rod, an L-shaped rod fixed at the end of the connecting rod away from the vertical rod, the L-shaped rod extending through the water tank into the transfer chamber, a piston plate slidably connected in the transfer chamber, and the L-shaped rod fixedly connected to the piston plate.

[0020] Preferably, the inlet pipe is provided with a first check valve, and the outlet pipe is provided with a second check valve.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] 1. This invention, by setting up a cleaning component, uses a motor to drive a rotating shaft to rotate. Under the action of the threaded engagement, a scraper moves up and down along the rotating shaft to clean away the sand and gravel adhering to the filter cartridge, thus avoiding sand and gravel clogging the filter cartridge. This eliminates the need to replace the filter cartridge, reduces production and labor costs, and also prevents workers from being burned.

[0023] 2. This invention, by setting up a slag discharge component, when the scraper moves downward to the bottom of the filter cylinder, it presses down on the adjusting rod. The adjusting rod drives the rack and movable rod to move downward and compress the spring. The rack drives the gear to rotate and open the valve. The sand and gravel deposited in the filter cylinder are discharged from the waste slag pipe. There is no need for manual cleaning of the filter cylinder, which has high work efficiency and low labor cost.

[0024] 3. This invention, through the installation of a drainage component, allows filtered water and water vapor to exchange heat through a heat exchange device before entering the water storage chamber. A motor drives a rotating shaft, which in turn drives an eccentric wheel to rotate synchronously. Under the action of the eccentric wheel, the vertical rod drives the connecting rod and L-shaped rod to move horizontally back and forth, thereby causing the piston plate to move horizontally back and forth within the transfer chamber. When the piston plate moves away from the outlet pipe, it draws water from the water storage chamber into the transfer chamber. When the piston plate moves closer to the outlet pipe, it discharges the water from the transfer chamber into the mining well through the outlet pipe, achieving water recycling. This eliminates the need for an additional booster pump to continuously inject water into the mining well, reducing mining costs and avoiding resource waste. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of a device for mining dry hot rock geothermal energy resources proposed in this invention.

[0026] Figure 2 This is a front view of an apparatus for mining dry hot rock geothermal energy resources proposed in this invention;

[0027] Figure 3 This is a schematic diagram of the scraper structure of a dry hot rock geothermal energy resource extraction device proposed in this invention;

[0028] Figure 4 This is a schematic diagram of the drive component structure of a dry hot rock geothermal energy resource extraction device proposed in this invention;

[0029] Figure 5 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 6 for Figure 2 Enlarged view of section B in the middle.

[0031] In the diagram: 1. Box body, 2. Heat exchange equipment, 3. Water tank, 4. Hollow tube, 5. Waste residue pipe, 6. Air inlet pipe, 21. Filter cartridge, 22. Rotating shaft, 23. Motor, 24. Scraper, 241. Annular plate, 242. Limiting plate, 243. Threaded hole, 31. Sleeve, 32. Movable rod, 33. Spring, 34. Adjusting rod, 35. Rack, 36. Valve, 37. Gear, 41. Partition plate, 42. Water storage chamber, 43. Transfer chamber, 44. Water inlet pipe, 45. Water outlet pipe, 46. Piston plate, 51. Eccentric wheel, 52. Annular groove, 53. Vertical rod, 54. Connecting rod, 55. L-shaped rod. Detailed Implementation

[0032] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Reference Figures 1-6 A device for mining hot dry rock geothermal energy resources includes a housing 1, a filter assembly, and a drainage assembly. The housing 1 is connected to a heat exchange device 2 via a conduit, and the heat exchange device 2 is connected to a water tank 3 via a conduit. Hollow pipes 4 and waste pipes 5 are connected to the upper and lower ends of the housing 1, respectively. An air inlet pipe 6 is connected to the hollow pipe 4. During operation, the air inlet pipe 6 is connected to the outlet of the mining well, and the water tank 3 is connected to the inlet of the mining well. The water in the water tank 3 is pressurized and enters the mining well. After passing through the hot dry rock, it is converted into water vapor and enters the housing 1 through the air inlet pipe 6.

[0034] The filter assembly includes a filter cartridge 21 fixed inside the housing 1. Both ends of the filter cartridge 21 are connected to a hollow tube 4 and a waste residue pipe 5, respectively. The filter assembly also includes a cleaning component and a slag discharge component. The cleaning component includes a rotating shaft 22 rotatably connected to the filter cartridge 21 and the hollow tube 4. The rotating shaft 22 passes through the hollow tube 4 and is connected to a motor 23 via a coupling. The portion of the rotating shaft 22 inside the filter cartridge 21 has a reciprocating thread, and a scraper 24 is threaded onto the reciprocating thread. The scraper 24 is slidably connected to the filter cartridge 21. The scraper 24 includes an annular plate 241, on which a limiting plate 242 is fixed. The filter cartridge 21 has a sliding groove, and the limiting plate 242 is slidably connected within the sliding groove. One end of the limiting plate 242 penetrates the filter cylinder 21. The limiting plate 242 has a threaded hole 243 at the center of the annular plate 241. The threaded hole 243 is adapted to the reciprocating thread on the rotating shaft 22. The slag discharge component includes a sleeve 31 fixed to the bottom of the housing 1. A movable rod 32 is slidably connected inside the sleeve 31. A spring 33 is provided between the movable rod 32 and the bottom of the sleeve 31. The two ends of the spring 33 are fixedly connected to the movable rod 32 and the sleeve 31, respectively. An adjusting rod 34 is fixed to the top of the movable rod 32 via a connecting plate. The adjusting rod 34 penetrates the bottom of the housing 1 and is slidably connected to the housing 1. A rack 35 is fixed to the end of the adjusting rod 34 outside the housing 1. The device also includes a valve 36 rotatably connected inside the waste pipe 5. A central shaft is fixed on the valve 36, and a gear 37 is fixed on the central shaft. The gear 37 meshes with a rack 35, and the number of teeth on the rack 35 is one-quarter of the number of teeth on the gear 37. After entering the housing 1, water vapor passes through the hollow pipe 4 and enters the filter cartridge 21. After the water vapor flows out of the filter holes of the filter cartridge 21, it enters the heat exchange device 2 to release heat. The sand and gravel in the water vapor are left inside the filter cartridge. The motor 23 drives the rotating shaft 22 to rotate. Under the action of the threaded engagement, the scraper 24 moves up and down along the rotating shaft 22 to clean the sand and gravel adhering to the filter cartridge 21, thus preventing the sand and gravel from clogging the filter cartridge 21 and eliminating the need to replace the filter cartridge 21. This design reduces production and labor costs, while also preventing workers from being burned during filter replacement, thus reducing safety hazards. When the scraper 24 moves downward to the bottom of the filter cartridge 21, it presses down on the adjusting rod 34. The adjusting rod 34 drives the rack 35 and the movable rod 32 to move downward and compress the spring 33. The rack 35 drives the gear 37 to rotate 90°, opening the valve 36. The sand and gravel deposited in the filter cartridge 21 are discharged from the waste pipe 5. When the scraper 24 moves upward, the movable rod 32 and the adjusting rod 34 are lifted by the elastic force of the spring 33, thereby closing the valve 36. There is no need for manual cleaning of the filter cartridge. The structure is simple and reasonable, with high work efficiency and low labor costs.

[0035] The drainage assembly includes a partition 41 fixed inside the water tank 3, which divides the water tank 3 into a storage chamber 42 and a transfer chamber 43. The partition 41 has an inlet pipe 44 connecting the storage chamber 42 and the transfer chamber 43. An outlet pipe 45 connects to the transfer chamber 43. The drainage assembly also includes a drive component, which includes an eccentric wheel 51 fixed to a rotating shaft 22. An annular groove 52 is formed on the eccentric wheel 51. A vertical rod 53 is slidably connected within the annular groove 52. A connecting rod 54 is rotatably connected to the vertical rod 53. An L-shaped rod 55 is fixed to one end of the connecting rod 54 away from the vertical rod 53. The L-shaped rod 55 extends through the water tank 3 into the transfer chamber 43. A piston plate 46 is slidably connected within the transfer chamber 43. The L-shaped rod 55 is fixedly connected to the piston plate 46. A first check valve is provided on the inlet pipe 44, and a second check valve is provided on the outlet pipe 45. The first check valve allows water to enter the transfer chamber 43 from the storage chamber 42, and the second check valve allows water to enter the outlet pipe 45 from the transfer chamber 43. After the filtered water and water vapor are heated by the heat exchanger 2, they enter the storage chamber 42. When the motor 23 drives the rotating shaft 22, the eccentric wheel 51 rotates synchronously. Under the action of the eccentric wheel 51, the vertical rod 53 drives the connecting rod 54 and the L-shaped rod 55 to move horizontally back and forth, so that the piston plate 46 moves horizontally back and forth in the transfer chamber 43. When the piston plate 46 moves away from the outlet pipe 45, it draws water from the storage chamber 42 into the transfer chamber 43. When the piston plate 46 moves closer to the outlet pipe 45, it discharges the water in the transfer chamber 43 into the mining well through the outlet pipe 45, realizing water recycling. It is not necessary to add an additional booster pump to continuously inject water into the mining well, reducing mining costs and avoiding resource waste.

[0036] The functional principle of this invention can be explained by the following operation: During operation, the air inlet pipe 6 is connected to the outlet of the mining well, and the water outlet pipe 45 is connected to the inlet of the mining well. The water in the water tank 3 is pressurized and enters the mining well. After passing through the dry hot rock, it turns into water vapor and enters the housing 1 through the air inlet pipe 6. After entering the housing 1, the water vapor passes through the hollow pipe 4 and enters the filter cartridge 21. The water vapor flows out from the filter holes of the filter cartridge 21 and enters the heat exchange device 2 to release heat. The sand and gravel in the water vapor are retained in the filter cartridge 21. The motor 23 drives the rotating shaft 22 to rotate. Under the action of the threaded engagement, the scraper 24 moves up and down along the rotating shaft 22 to clean the sand and gravel adhering to the filter cartridge 21, preventing sand and gravel from clogging the filter cartridge 21 and eliminating the need to replace the filter cartridge 21, thus reducing production and labor costs. It also prevents workers from being burned during filter cartridge replacement, reducing safety hazards. When the scraper 24 moves downward to the bottom of the filter cartridge 21, it presses down on the adjusting rod 34. The adjusting rod 34 drives the rack 35 and the movable rod 32 to move downward and compress the spring 33. The rack 35 drives the gear 37 to rotate. Open valve 36 at 0°, and the sand and gravel deposited in filter cartridge 21 are discharged from waste pipe 5. When scraper 24 moves upward, the spring force of spring 33 lifts movable rod 32 and adjusting rod 34, thereby closing valve 36. No manual cleaning of filter cartridge 21 is required. The structure is simple and reasonable, with high working efficiency and low labor cost. The filtered water and water vapor enter the water storage chamber 42 after heat exchange through heat exchange equipment 2. When motor 23 drives rotating shaft 22, eccentric wheel 51 rotates synchronously. Vertical rod 53 is on the eccentric wheel Under the action of 51, the connecting rod 54 and the L-shaped rod 55 move horizontally back and forth, thereby causing the piston plate 46 to move horizontally back and forth in the transfer chamber 43. When the piston plate 46 moves away from the water outlet pipe 45, it draws water from the water storage chamber 42 into the transfer chamber 43. When the piston plate 46 moves closer to the water outlet pipe 45, it discharges the water in the transfer chamber 43 into the mining well through the water outlet pipe 45, realizing water recycling. It eliminates the need for an additional booster pump to continuously inject water into the mining well, reducing mining costs and avoiding resource waste.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A device for extracting geothermal energy resources from dry hot rock, characterized in that, include: The box (1) is connected to a heat exchange device (2) via a conduit. The heat exchange device (2) is connected to a water tank (3) via a conduit. The upper and lower ends of the box (1) are respectively connected to a hollow pipe (4) and a waste pipe (5). An air inlet pipe (6) is connected to the hollow pipe (4). The filter assembly includes a filter cylinder (21) fixed inside the housing (1), with both ends of the filter cylinder (21) connected to a hollow tube (4) and a waste residue tube (5) respectively. The filter assembly also includes a cleaning component and a slag discharge component. The drainage assembly includes a partition (41) fixed inside the water tank (3), the partition (41) dividing the water tank (3) into a water storage chamber (42) and a transfer chamber (43), the partition (41) being provided with an inlet pipe (44) connecting the water storage chamber (42) and the transfer chamber (43), the transfer chamber (43) being connected with an outlet pipe (45), and the drainage assembly also includes a drive component; The cleaning component includes a rotating shaft (22) that is rotatably connected to the filter cartridge (21) and the hollow tube (4). The rotating shaft (22) passes through the hollow tube (4) and is connected to a motor (23) via a coupling. The portion of the rotating shaft (22) inside the filter cartridge (21) is provided with a reciprocating thread. A scraper (24) is threaded onto the reciprocating thread. The scraper (24) is slidably connected to the filter cartridge (21). The slag discharge component includes a sleeve (31) fixed to the bottom of the box (1). A movable rod (32) is slidably connected inside the sleeve (31). A spring (33) is provided between the movable rod (32) and the bottom of the sleeve (31). The two ends of the spring (33) are fixedly connected to the movable rod (32) and the sleeve (31) respectively. An adjusting rod (34) is fixed to the top of the movable rod (32) through a connecting plate. The adjusting rod (34) passes through the bottom of the box (1) and is slidably connected to the box (1). A rack (35) is fixed to one end of the adjusting rod (34) outside the box (1). The slag discharge component also includes a valve (36) rotatably connected in the slag pipe (5), a central shaft is fixed on the valve (36), a gear (37) is fixed on the central shaft, and the gear (37) meshes with the rack (35).

2. The device for extracting geothermal energy resources from dry hot rock according to claim 1, characterized in that, The scraper (24) includes an annular plate (241), a limiting plate (242) is fixed on the annular plate (241), the filter cylinder (21) is provided with a sliding groove, the limiting plate (242) is slidably connected in the sliding groove, one end of the limiting plate (242) passes through the filter cylinder (21), the limiting plate (242) is provided with a threaded hole (243) at the center of the annular plate (241), and the threaded hole (243) is adapted to the reciprocating thread on the rotating shaft (22).

3. The extraction device for dry hot rock geothermal energy resources according to claim 1, characterized in that, The number of teeth on the rack (35) is one-quarter of the number of teeth on the gear (37).

4. The extraction device for dry hot rock geothermal energy resources according to claim 1, characterized in that, The driving component includes an eccentric wheel (51) fixed on a rotating shaft (22). An annular groove (52) is provided on the eccentric wheel (51). A vertical rod (53) is slidably connected in the annular groove (52). A connecting rod (54) is rotatably connected on the vertical rod (53). An L-shaped rod (55) is fixed at one end of the connecting rod (54) away from the vertical rod (53). The L-shaped rod (55) extends through the water tank (3) into the transfer chamber (43). A piston plate (46) is slidably connected in the transfer chamber (43). The L-shaped rod (55) is fixedly connected to the piston plate (46).

5. The extraction device for dry hot rock geothermal energy resources according to claim 1, characterized in that, The inlet pipe (44) is equipped with a first check valve, and the outlet pipe (45) is equipped with a second check valve.

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