A filtering device for saline-alkali soil improvement

Abstract

This invention belongs to the field of saline-alkali land management technology, and particularly relates to a filtration device for saline-alkali land improvement, comprising: a heat exchange station; several geothermal collection and desalination devices connected to the heat exchange station, the geothermal collection and desalination devices being buried in the saline-alkali land, with the buried bottom of the devices extending into the geothermal layer; the geothermal collection and desalination devices comprising: a hollow pile, the side wall of which has an inlet communicating with the saline-alkali land; a heat exchange pile, coaxially fixed to the inner side of the hollow pile, the bottom of which extends into the geothermal layer, a saline-alkali cold water cavity being provided between the outer wall of the heat exchange pile and the hollow pile, the saline-alkali cold water cavity being connected to the outlet of the heat exchange station through a cold water return pipe; a heat insulation part, which is wrapped around the outside of the heat exchange pile and located inside the saline-alkali cold water cavity; a heat exchange filtration part, used for filtering hot brine and allowing the filtered hot brine to enter the heat exchange station; a heat absorption part, used for absorbing geothermal energy; and a condensation part, used for condensing the water vapor generated by the hot brine and guiding it to the surface of the saline-alkali land.

Description

Technical Field

[0001] This invention belongs to the field of saline-alkali land management technology, and in particular relates to a filtration device for saline-alkali land improvement. Background Technology

[0002] Saline-alkali land is a type of salt accumulation. Because saline-alkali soil contains salt and alkali components, the survival rate of plants planted in saline-alkali soil is low. Therefore, the improvement and utilization of saline-alkali soil is related to the development of urban economy and the improvement of ecological environment.

[0003] The current methods for improving saline-alkali land include irrigation to wash away salt, backfilling with topsoil, and planting greenery. Plants also need water to grow, so irrigation and filtration in water bodies are particularly important. Since freshwater resources are relatively scarce in saline-alkali areas, it is necessary to develop a water pipe filtration device for saline-alkali land that can purchase and sell water to filter salt and alkali components during the irrigation process, thereby reducing the amount of salt entering the saline-alkali land.

[0004] Traditional techniques for desalinating saline-alkali land require a large amount of energy. Although some areas are not suitable for agricultural planting, they have relatively abundant geothermal energy. If geothermal energy can be fully utilized to alleviate the energy consumption of saline-alkali land treatment, and energy can be fully utilized while treating saline-alkali land, a win-win situation for saline-alkali land treatment and environmental protection can be created. Therefore, we propose a filtration device for saline-alkali land improvement to solve this problem. Summary of the Invention

[0005] The purpose of this invention is to provide a filtration device for improving saline-alkali land, so as to solve the above-mentioned problems.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] A filtration device for improving saline-alkali land includes:

[0008] Heat exchange station;

[0009] Several geothermal collection and desalination devices are connected to the heat exchange station. The geothermal collection and desalination devices are buried in the saline-alkali land. The bottom end of the buried geothermal collection and desalination devices extends into the geothermal layer. The geothermal collection and desalination devices collect geothermal energy and then transport it to the heat exchange station.

[0010] The geothermal collection and desalination device includes:

[0011] Hollow piles are buried in saline-alkali land, and the sidewalls of the hollow piles are provided with water inlets that communicate with the saline-alkali land.

[0012] A heat exchange pile is coaxially fixed inside the hollow pile. The bottom of the heat exchange pile extends into the geothermal layer. The heat exchange pile is used for heat exchange with the geothermal layer. A salt-alkali cold water cavity is provided between the outer wall of the heat exchange pile and the hollow pile. The salt-alkali cold water cavity is connected to the outlet of the heat exchange station through a cold water return pipe.

[0013] The heat insulation part is wrapped around the outside of the heat exchange pile and located inside the salt-alkali cold water cavity;

[0014] A heat exchange filtration section is disposed on the inner side above the heat exchange pile. The heat exchange filtration section is connected to the inlet of the heat exchange station and is used for filtering hot brine and allowing the filtered hot brine to enter the heat exchange station.

[0015] A heat-absorbing part is disposed on the lower inner side of the heat exchange pile. The water inlet of the heat-absorbing part is connected to the bottom of the salt-alkali cold water chamber. The heat-absorbing part exchanges heat with the bottom of the heat exchange pile. The heat-absorbing part is used to absorb geothermal energy. The water outlet of the heat-absorbing part is connected to the water inlet of the heat exchange filter part.

[0016] The condenser section, located at the steam outlet of the heat exchange and filtration section, is used to condense the water vapor generated by the hot brine and guide it to the surface layer of the saline-alkali land.

[0017] Optionally, a partition is axially connected to the middle of the inner side of the heat exchange pile, the partition dividing the heat exchange pile into a filter chamber at the top and a geothermal heat exchange chamber at the bottom, and the heat exchange filter is located in the filter chamber.

[0018] Optionally, the heat exchange filter section includes:

[0019] A filter element is axially connected to the middle of the filter chamber. The filter element divides the filter chamber into an upper filtered hot water chamber and a lower saline-alkali hot water chamber. The top of the filter element is connected to the filtered hot water chamber, and the bottom of the filter element is connected to the saline-alkali hot water chamber.

[0020] One end of the hot water inlet pipe is connected to one side of the filtered hot water chamber, and the other end of the hot water inlet pipe is connected to the inlet of the heat exchange station.

[0021] The condenser section is located at the top opening of the filtered hot water chamber.

[0022] Optionally, the condensation section includes a conical cap, which is axially connected to the top of the heat exchange pile. The conical cap is located directly above the opening of the filtered hot water chamber. Water vapor condenses into water droplets after contacting the conical cap and drips along the inner edge of the conical cap onto the surface of the saline-alkali land.

[0023] Optionally, the heat-absorbing part includes:

[0024] A water pump has its outlet end connected to the saline-alkali hot water chamber. The inlet end of the water pump is connected to the outlet end of several heat exchange tubes. The middle part of the heat exchange tubes extends into the geothermal heat exchange chamber. The heat exchange tubes are configured to exchange heat with the geothermal heat exchange chamber. The inlet end of the heat exchange tubes is connected to the bottom of the saline-alkali cold water chamber.

[0025] Optionally, the heat insulation part includes heat insulation cotton, which is wrapped around the outside of the heat exchange pile and located inside the salt-alkali cold water cavity.

[0026] Optionally, several of the hollow piles are buried in a matrix within the saline-alkali land.

[0027] Optionally, the inlet is equipped with a filter screen to prevent soil from entering.

[0028] Compared with the prior art, the present invention has the following advantages and technical effects:

[0029] In operation, several hollow piles are buried in the saline-alkali land, and heat exchange piles are installed. Water in the saline-alkali land enters the saline-alkali cold water chamber through the inlet. After entering the saline-alkali cold water chamber, the brine is guided to the bottom of the heat exchange piles through the heat absorption section to absorb geothermal energy. The heated brine is then introduced into the heat exchange filtration section. After the heat exchange filtration section filters the hot brine, the generated water vapor moves to the condensation section for condensation. The condensate is desalinated fresh water, which drips onto the surface of the saline-alkali land. On the other hand, the filtered brine enters the heat exchange station to utilize its thermal energy. After the thermal energy is utilized, the cold water flows back to the saline-alkali cold water chamber through the cold water return pipe to continue participating in geothermal collection. During the geothermal collection process in the saline-alkali area, the device condenses the generated steam into desalinated fresh water and returns it to the surface of the saline-alkali land. While utilizing geothermal energy, it reduces the salinity of the surface layer of the saline-alkali land. Combined with the mixing of organic matter and vegetation on the surface layer of the saline-alkali land, it can effectively improve the fertility of the saline-alkali land and can transform it into farmland. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly described below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of the present invention;

[0032] Figure 2 For the present invention Figure 1 Enlarged view of a portion of point A in the middle;

[0033] Figure 3 For the present invention Figure 1 Enlarged view of a section at point B in the middle;

[0034] Figure 4 For the present invention Figure 1 Enlarged view of a section at point C;

[0035] Figure 5 For the present invention Figure 1 Enlarged view of a section at point D;

[0036] The components are as follows: 1. Heat exchange station; 2. Hollow pile; 3. Conical cap; 4. Heat exchange pile; 5. Water inlet; 6. Filter element; 7. Filtered hot water chamber; 8. Salt-alkali cold water chamber; 9. Heat exchange pipe; 10. Geothermal heat exchange chamber; 11. Water pump; 12. Insulation cotton; 13. Cold water return pipe; 14. Hot water inlet pipe; 15. Salt-alkali hot water chamber; 16. Partition. Detailed Implementation

[0037] In traditional technology, there is a filtration device for improving saline-alkali land, which includes a box body with a filter chamber inside. A first motor is fixedly connected inside the box body, a threaded rod is fixedly connected to the output shaft surface of the first motor, a first rotating shaft is fixedly connected to the threaded rod surface, a first bearing is sleeved on the surface of the first rotating shaft, a fixing plate is threadedly connected to the threaded rod surface, a sliding rod is fixedly connected inside the box body, the fixing plate is sleeved on the surface of the sliding rod, a filter box is fixedly connected to the upper surface of the fixing plate, a filter plate is fixedly connected inside the filter box, a movable groove is opened on the surface of the filter chamber, the filter box passes through the movable groove, a conveyor box passes through the surface of the filter chamber, a machine compartment is opened inside the conveyor box, and a second motor is fixedly connected inside the machine compartment.

[0038] When using the above-mentioned filtration device for improving saline-alkali land, the second motor drives the auger to rotate, and then people transport the saline-alkali water to the conveying box through the feed pipe. Under the action of the auger, the large particles of impurities in the saline-alkali water are transported to the outside at a uniform speed, and the remaining saline-alkali water is transported to the filter box through the filter screen for secondary filtration through the filter plate.

[0039] The machine housing has a second bearing installed on its surface, the output shaft of the second motor installed inside the second bearing, a auger fixedly connected to the surface of the output shaft of the second motor, a filter screen embedded in the lower surface of the conveyor box, a water inlet pipe installed on the upper surface of the conveyor box, the water inlet pipe installed on the surface of the filter compartment, a water pump fixedly connected to the upper surface of the box, the water pump inlet pipe installed on the surface of the filter compartment, and the water pump outlet pipe installed on the surface of the box.

[0040] A water inlet pipe is installed on the upper surface of the box, a fixed frame is fixedly connected to the upper surface of the box, a third motor is fixedly connected to the surface of the fixed frame, a third bearing is installed on the upper surface of the box, the output shaft of the third motor is installed inside the third bearing, a second rotating shaft is fixedly connected to the surface of the output shaft of the third motor, and a stirring shaft is fixedly connected to the surface of the second rotating shaft.

[0041] It has multiple stirring shafts, which are symmetrically fixed to the surface of the second rotating shaft in pairs, and water outlet pipes are installed on the surface of the box.

[0042] A solenoid valve is fixedly connected to the surface of its water outlet pipe.

[0043] Compared to other technical solutions, this solution, by incorporating a second motor, auger, filter screen, and filter plate, allows for more efficient filtration. The device uses a control switch to operate the second motor, which in turn drives the auger. The brine is then fed into a conveying box through a feed pipe. The auger uniformly removes large particles of impurities from the brine, while the remaining brine is conveyed through the filter screen to a filter box for secondary filtration by the filter plate. The second motor, auger, filter screen, and filter plate facilitate more efficient filtration. Furthermore, the inclusion of a first motor, threaded rod, fixed plate, and sliding rod allows for easier cleaning of the filter plate. The first motor is controlled by a switch, which in turn drives the threaded rod. With the assistance of the rod, the fixed plate moves, allowing the filter box and filter plates to be moved out for easy cleaning. The action of the first motor, threaded rod, fixed plate, and sliding rod further facilitates cleaning of the filter plates. By incorporating a water pump, a third motor, and a stirring shaft, the filtered brine is treated by controlling the water pump via a switch, which then delivers the filtered brine into the box. A suitable amount of material is added to the box through the water inlet pipe, and the third motor is controlled by the switch, which in turn drives the stirring shaft to agitate the brine inside the box. This accelerates the reaction between the material and the brine, resulting in more thorough filtration and sedimentation separation. The action of the water pump, third motor, and stirring shaft further speeds up the reaction rate.

[0044] In another prior art, a filtration device for improving saline-alkali land includes two sets of bases and a filter box body. A support frame is fixedly installed at the top of the base, and an mounting plate is fixedly installed on one side of the support frame. Multiple nozzles are fixedly installed in the middle of the mounting plate. An arc-shaped support is fixedly installed in the middle of the support frame, and a filter box body is fixedly installed at the top of the arc-shaped support. An inlet is fixedly installed at one end of the filter box body. A first filter plate and a second filter plate are respectively installed on one side of the interior of the filter box body. A stirring mechanism is fixedly installed on the other side of the interior of the filter box body. An outlet is fixedly installed on one side of the front of the filter box body, and the positions of the outlet and the nozzles correspond to each other.

[0045] Each top plate is fixedly installed on one side of the top of the support frame. A through hole is provided in the middle of the bottom of the top plate, and a booster pump is fixedly installed at the through hole. The two ends of the booster pump correspond to the water outlet of the filter box body and one end of the nozzle, respectively, and the three are connected by a sealed water pipe.

[0046] Multiple slots are provided on both sides of the inner wall of the filter box body. The slots are arranged in pairs opposite each other and are engaged and fixed with the first filter plate and the second filter plate.

[0047] A partition is fixedly installed in the middle of the filter box body, and a two-way pipe is provided in the middle of the partition. A mixing box body is fixedly installed on one side of the partition.

[0048] The mixing tank has a hopper at the top inside. Two sets of damping mechanisms are fixedly installed on one side inside the mixing tank. A bidirectional pipe is provided in the middle of the damping mechanism. The damping mechanism includes a damping box, two compression springs, a support plate, and springs that are vertically installed on the side wall of the damping box. The two compression springs are horizontally installed in the middle of the damping box.

[0049] One end of the spring is fixedly connected to a connecting rod, and the other end of the connecting rod is movably connected to a support plate. A rotating shaft is provided at the connection between the connecting rod and the support plate.

[0050] A sealing box is fixedly connected to one side of the support plate. A motor is fixedly installed inside the sealing box, and the output end of the motor is connected to the stirring mechanism.

[0051] A third filter plate is fixedly installed on the other side of the interior of the filter box body, and a sealing cover is fixedly installed on one end of the filter box body. The third filter plate is located on one side of the shock absorption mechanism.

[0052] This filtration device for improving saline-alkali land uses multiple sets of filter plates located inside the filter box to filter the water in the saline-alkali land multiple times, improving the filtration quality of the saline water. A booster pump is connected to the outlet at the rear of the filter box. This booster pump can be connected to nozzles on the mounting plate via water pipes. There are several nozzles, and they are arranged horizontally, which ensures a large area of ​​irrigation and high efficiency. The booster pump can also compress and pressurize the filtered water, and after further treatment by the nozzles themselves, the water can be sprayed over a long distance, irrigating plants at a distance and greatly improving irrigation efficiency.

[0053] However, in actual use, the above-mentioned devices consume a lot of energy and cannot utilize geothermal energy, making it difficult to promote their use in energy-scarce saline-alkali areas.

[0054] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0055] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0056] Reference Figures 1 to 5This invention discloses a filtration device for improving saline-alkali land, comprising:

[0057] Heat exchange station 1;

[0058] Several geothermal collection and desalination devices are connected to heat exchange station 1. The geothermal collection and desalination devices are buried in saline-alkali land. The bottom of the buried geothermal collection and desalination devices extends into the geothermal layer. After collecting geothermal energy, the geothermal collection and desalination devices are transported to heat exchange station 1.

[0059] Geothermal collection and desalination devices include:

[0060] Hollow pile 2 is buried in saline-alkali land, and the side wall of hollow pile 2 is provided with water inlet 5 that communicates with the saline-alkali land.

[0061] Heat exchange pile 4 is coaxially fixed inside the hollow pile 2. The bottom of heat exchange pile 4 extends into the geothermal layer. Heat exchange pile 4 is used for heat exchange with the geothermal layer. A salt-alkali cold water chamber 8 is provided between the outer wall of heat exchange pile 4 and the hollow pile 2. The salt-alkali cold water chamber 8 is connected to the outlet of heat exchange station 1 through cold water return pipe 13.

[0062] The insulation part is wrapped around the heat exchange pile 4 and located inside the salt-alkali cold water chamber 8;

[0063] The heat exchange filtration section is located on the inner side of the heat exchange pile 4 and is connected to the inlet of the heat exchange station 1. It is used for filtering hot brine and allowing the filtered hot brine to enter the heat exchange station 1.

[0064] The heat absorption section is located on the lower inner side of the heat exchange pile 4. The water inlet of the heat absorption section is connected to the bottom of the salt and alkali cold water chamber 8. The heat absorption section exchanges heat with the bottom of the heat exchange pile 4. The heat absorption section is used to absorb geothermal energy. The water outlet of the heat absorption section is connected to the water inlet of the heat exchange filter section.

[0065] The condenser section, located at the steam outlet of the heat exchange and filtration section, is used to condense the water vapor generated by the hot brine and guide it to the surface layer of the saline-alkali land.

[0066] In use, several hollow piles 2 are buried in the saline-alkali land, and heat exchange piles 4 are set up. Water in the saline-alkali land enters the saline-alkali cold water chamber 8 through the inlet 5. After entering the saline-alkali cold water chamber 8, the brine is guided to the bottom of the heat exchange pile 4 through the heat absorption part to absorb geothermal energy. The heated brine is then introduced into the heat exchange filtration part. After the heat exchange filtration part filters the hot brine, the generated water vapor moves to the condensation part to condense. The condensate is desalinated fresh water, which drips to the surface of the saline-alkali land. On the other hand, the filtered brine enters the heat exchange station 1 to utilize its heat energy. After the heat energy is utilized, the cold water flows back to the saline-alkali cold water chamber 8 through the cold water return pipe 13 to continue to participate in geothermal collection. During the geothermal collection process in the saline-alkali area, the generated steam is condensed into desalinated fresh water and returned to the surface of the saline-alkali land. While utilizing geothermal energy, the salinity of the surface layer of the saline-alkali land is reduced. Combined with the mixing of organic matter and plant treatment on the surface layer of the saline-alkali land, the fertility of the saline-alkali land can be effectively improved, and it can be transformed into farmland.

[0067] After the device is installed and before use, the surface of the saline-alkali land is flooded with fresh water. The fresh water seeps downward and carries away the salt in the surface of the saline-alkali land, so that the saline water can enter the saline-alkali cold water chamber 8 through the water inlet 5.

[0068] As an optional implementation, a partition 16 is axially connected to the middle of the inner side of the heat exchange pile 4. The partition 16 divides the heat exchange pile 4 into a filter chamber at the top and a geothermal heat exchange chamber 10 at the bottom, with the heat exchange filter section located inside the filter chamber.

[0069] As an optional implementation, the heat exchange filter section includes:

[0070] The filter element 6 is axially connected to the middle of the filter chamber. The filter element 6 divides the filter chamber into the upper filtered hot water chamber 7 and the lower saline hot water chamber 15. The top of the filter element 6 is connected to the filtered hot water chamber 7, and the bottom of the filter element 6 is connected to the saline hot water chamber 15.

[0071] One end of the hot water inlet pipe 14 is connected to one side of the filtered hot water chamber 7, and the other end of the hot water inlet pipe 14 is connected to the inlet of the heat exchange station 1.

[0072] The condenser is located at the top opening of the filtered hot water chamber 7.

[0073] As an optional implementation, the condenser includes a conical cap 3, which is axially connected to the top of the heat exchange pile 4. The conical cap 3 is located directly above the opening of the filtered hot water chamber 7. After water vapor comes into contact with the conical cap 3, it condenses into water droplets and drips along the inner edge of the conical cap 3 onto the surface of the saline-alkali land.

[0074] As an optional implementation, the heat-absorbing part includes:

[0075] The water pump 11 has its outlet end connected to the saline-alkali hot water chamber 15. The inlet end of the water pump 11 is connected to the outlet end of several heat exchange tubes 9. The middle part of the heat exchange tubes 9 extends into the geothermal heat exchange chamber 10. The heat exchange tubes 9 and the geothermal heat exchange chamber 10 are configured to exchange heat. The inlet end of the heat exchange tubes 9 is connected to the bottom of the saline-alkali cold water chamber 8.

[0076] When the equipment is running, the water pump 11 operates, pumping the cold brine from the cold water chamber 8 into the hot water chamber 15 through the heat exchange pipe 9. The cold brine passes through the geothermal heat exchange chamber 10, and the bottom of the heat exchange pile 4 is located in the geothermal layer, enabling heat exchange with the geothermal source. The cold brine is also heated through the heat exchange pipe 9, making the brine entering the hot water chamber 15 a high-temperature brine. As the water pump 11 continues to operate, the hot water chamber 15 fills with brine, and the water pressure increases. At this time, the hot brine moves through the filter element 6 to the filtered hot water chamber 7, where the filter element 6 performs the first brine desalination filtration. A portion of the filtered brine in the filtered hot water chamber 7 then enters the hot water chamber through the heat exchange pipe 9. Water inlet pipe 14 leads to heat exchange station 1 for thermal energy utilization, while another part evaporates and moves upward to conical cap 3. Conical cap 3 is located above the saline-alkali land and has a lower temperature. Water vapor condenses into water after contacting the bottom of conical cap 3. The water produced by the condensation of water vapor is fresh water. The fresh water drips along the inner edge of conical cap 3 to the surface of saline-alkali land. On the one hand, it can replenish the moisture of saline-alkali land. After the fresh water enters the surface layer of saline-alkali land, it takes away the salt on the surface layer of saline-alkali land again. In conjunction with crop planting, when irrigating crops, the irrigation water will also wash away the salt on the surface layer of saline-alkali land. This device operates continuously, which can effectively utilize geothermal energy and continuously treat saline-alkali land.

[0077] As an optional implementation, the heat insulation part includes heat insulation cotton 12, which is wrapped around the outside of the heat exchange pile 4 and located inside the salt and alkali cold water cavity 8.

[0078] As an alternative implementation, several hollow piles 2 are buried in a matrix within the saline-alkali land.

[0079] As an optional implementation, a filter screen is installed inside the water inlet 5 to prevent soil from entering.

[0080] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0081] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A filtration device for improving saline-alkali land, characterized in that, include: Heat exchange station (1); Several geothermal collection and desalination devices are connected to the heat exchange station (1). The geothermal collection and desalination devices are buried in the saline-alkali land. The bottom end of the buried geothermal collection and desalination devices extends into the geothermal layer. The geothermal collection and desalination devices collect geothermal energy and then transport it to the heat exchange station (1). The geothermal collection and desalination device includes: Hollow pile (2) is buried in saline-alkali land, and the side wall of the hollow pile (2) is provided with a water inlet (5) that communicates with the saline-alkali land; A heat exchange pile (4) is coaxially fixed inside the hollow pile (2). The bottom of the heat exchange pile (4) extends into the geothermal layer. The heat exchange pile (4) is used for heat exchange with the geothermal layer. A salt-alkali cold water cavity (8) is provided between the outer wall of the heat exchange pile (4) and the hollow pile (2). The salt-alkali cold water cavity (8) is connected to the outlet of the heat exchange station (1) through a cold water return pipe (13). The heat insulation part is wrapped around the outside of the heat exchange pile (4) and located inside the salt and alkali cold water cavity (8); A heat exchange filter section is provided on the inner side above the heat exchange pile (4). The heat exchange filter section is connected to the inlet of the heat exchange station (1) and is used for filtering hot brine and allowing the filtered hot brine to enter the heat exchange station (1). The heat absorption section is located on the inner side of the heat exchange pile (4). The water inlet of the heat absorption section is connected to the bottom of the salt and alkali cold water chamber (8). The heat absorption section exchanges heat with the bottom of the heat exchange pile (4). The heat absorption section is used to absorb geothermal energy. The water outlet of the heat absorption section is connected to the water inlet of the heat exchange filter section. The condensation section, located at the steam outlet of the heat exchange and filtration section, is used to condense the water vapor generated by the hot brine and guide it to the surface layer of the saline-alkali land. A partition (16) is axially connected to the middle of the inner side of the heat exchange pile (4). The partition (16) divides the heat exchange pile (4) into a filter chamber at the top and a geothermal heat exchange chamber (10) at the bottom. The heat exchange filter is located inside the filter chamber. The heat exchange and filtration section includes: The filter element (6) is axially connected to the middle of the filter chamber. The filter element (6) divides the filter chamber into a filtered hot water chamber (7) located above and a saline hot water chamber (15) located below. The top of the filter element (6) is connected to the filtered hot water chamber (7), and the bottom of the filter element (6) is connected to the saline hot water chamber (15). One end of the hot water inlet pipe (14) is connected to one side of the filtered hot water chamber (7), and the other end of the hot water inlet pipe (14) is connected to the inlet of the heat exchange station (1); The condenser is located at the top opening of the filtered hot water chamber (7); The condensation section includes a conical cap (3), which is axially connected to the top of the heat exchange pile (4). The conical cap (3) is located directly above the opening of the filtered hot water chamber (7). Water vapor condenses into water droplets after contacting the conical cap (3) and drips along the inner edge of the conical cap (3) onto the surface of the saline-alkali land.

2. The filtration device for improving saline-alkali land according to claim 1, characterized in that, The heat-absorbing part includes: A water pump (11) has its outlet end connected to the saline-alkali hot water chamber (15). The inlet end of the water pump (11) is connected to the outlet end of several heat exchange tubes (9). The middle part of the heat exchange tubes (9) extends into the geothermal heat exchange chamber (10). The heat exchange tubes (9) and the geothermal heat exchange chamber (10) are configured for heat exchange. The inlet end of the heat exchange tubes (9) is connected to the bottom of the saline-alkali cold water chamber (8).

3. A filtration device for improving saline-alkali land according to claim 1, characterized in that: The heat insulation part includes heat insulation cotton (12), which is wrapped around the outside of the heat exchange pile (4) and located inside the salt and alkali cold water cavity (8).

4. A filtration device for improving saline-alkali land according to claim 1, characterized in that: Several hollow piles (2) are buried in a matrix in the saline-alkali land.

5. A filtration device for improving saline-alkali land according to claim 1, characterized in that: The inlet (5) is equipped with a filter screen to prevent soil from entering.

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