Filtering device for saline-alkali soil improvement

Abstract

The invention belongs to the technical field of saline-alkali land treatment, and particularly relates to a filtering device for saline-alkali land improvement. The terrestrial heat collecting and desalting devices are connected with the heat exchange station, the terrestrial heat collecting and desalting devices are buried in the saline-alkali soil, and the buried bottom ends of the terrestrial heat collecting and desalting devices extend into a terrestrial heat layer; the terrestrial heat collecting and desalting device comprises a hollow pile, wherein a water inlet communicated with the saline-alkali soil is formed in the side wall of the hollow pile; the heat exchange pile is coaxially and fixedly connected to the inner side of the hollow pile, the bottom of the heat exchange pile extends into the geothermal layer, a saline-alkali cold water cavity is formed between the outer wall of the heat exchange pile and the hollow pile, and the saline-alkali cold water cavity communicates with a heat exchange station outlet through a cold water return pipe; the heat insulation part wraps the heat exchange pile and is located in the saline-alkali cold water cavity; the heat exchange filtering part is used for filtering hot saline water and enabling the filtered hot saline water to enter the heat exchange station; the heat absorption part is used for absorbing geothermal energy; the condensation part is used for condensing water vapor generated by the hot saline water and guiding the water vapor to the saline-alkali soil surface layer.

Description

Technical Field

[0001] The invention belongs to the technical field of saline-alkali land treatment, and in particular relates to a filtering device for improving saline-alkali land. Background Art

[0002] Saline-alkali land is a type of salt accumulation. Since saline-alkali soil contains saline-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 of improving saline-alkali land are irrigation to wash away salt, backfilling with imported soil, and planting green plants. Plants also need water for irrigation and growth, so irrigation and filtration in water bodies are particularly important. Due to the relative scarcity of freshwater resources in saline-alkali areas, it is necessary to develop a saline-alkali land water pipe filtration device that can purchase and filter the saline-alkali components during the irrigation process, thereby reducing the salt entering the saline-alkali land.

[0004] In traditional technology, the desalination of saline water in saline-alkali land requires a lot of energy. Although saline-alkali land in some areas is not suitable for agricultural planting, it has relatively abundant geothermal energy. If we can make full use of geothermal energy to alleviate the energy consumption of saline-alkali land management and achieve full energy utilization while managing saline-alkali land, we can create a win-win situation for saline-alkali land management and environmental protection. Therefore, we propose a filtration device for saline-alkali land improvement to solve the problem. Summary of the invention

[0005] The object of the present invention is to provide a filtering device for improving saline-alkali land to solve the above problems.

[0006] To achieve the above object, the present invention provides the following solutions:

[0007] A filtering device for improving saline-alkali land, comprising:

[0008] Heat exchange station;

[0009] A plurality of geothermal heat collection and desalination devices are connected to the heat exchange station, the geothermal heat collection and desalination devices are buried in saline-alkali land, the bottom of the geothermal heat collection and desalination devices extends into the geothermal layer, and the geothermal heat collection and desalination devices collect geothermal energy and then transport it to the heat exchange station;

[0010] The geothermal heat collection and desalination device comprises:

[0011] A hollow pile is buried in the saline-alkali land, and a water inlet connected to the saline-alkali land is opened on the side wall of the hollow pile;

[0012] A heat exchange pile is coaxially fixed to the inner side of 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 saline cold water cavity is provided between the outer wall of the heat exchange pile and the hollow pile, and the saline cold water cavity is connected to the outlet of the heat exchange station through a cold water return pipe;

[0013] A heat insulation part, wrapped around the outside of the heat exchange pile and located in the saline cold water cavity;

[0014] A heat exchange filter unit is arranged above the inner side of the heat exchange pile, and the heat exchange filter unit 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 arranged at the lower inner side of the heat exchange pile, the water inlet end of the heat absorbing part is communicated with the bottom of the saline 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, and the water outlet end of the heat absorbing part is communicated with the water inlet end of the heat exchange filter part;

[0016] The condensation part is arranged at the steam outlet of the heat exchange and filtration part, and is used for condensing the water vapor generated by the hot brine and directing it to the surface layer of the saline-alkali land.

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

[0018] Optionally, the heat exchange and filtration unit includes:

[0019] A filter element, axially connected to the middle of the filter chamber, the filter element divides the filter chamber into a filtered hot water chamber located above and a saline-alkali hot water chamber located below, 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] A hot water inlet pipe, one end of which is connected to one side of the filtered hot water chamber, and the other end of which is connected to the inlet of the heat exchange station;

[0021] The condensation portion is located at the open top of the filtered hot water chamber.

[0022] Optionally, the condensation part 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 to the surface of the saline-alkali land.

[0023] Optionally, the heat absorption part includes:

[0024] A water pump, the water outlet end of which is connected to the saline-alkali hot water cavity, the water inlet end of the water pump is connected to the water outlet ends of several heat exchange tubes, the middle part of the heat exchange tube extends into the geothermal heat exchange cavity, the heat exchange tube is arranged for heat exchange with the geothermal heat exchange cavity, and the water inlet end of the heat exchange tube is connected to the bottom of the saline-alkali cold water cavity.

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

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

[0027] Optionally, a filter screen is provided in the water inlet to prevent soil from entering.

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

[0029] When in use, after burying several hollow piles in the saline-alkali land, and setting up the heat exchange piles, the water in the saline-alkali land enters the saline-alkali cold water cavity through the water inlet, and the salt water enters the saline-alkali cold water cavity and guides the salt water to the bottom of the heat exchange pile through the heat absorption part to absorb geothermal energy, and the heated salt water is introduced into the heat exchange filter part. After the heat exchange filter part filters the hot salt water, on the one hand, the water vapor generated is moved to the condensation part for condensation, and the condensed water is desalinated fresh water, which is dripped to the surface of the saline-alkali land. On the other hand, the filtered salt water 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 cavity through the cold water return pipe to continue to participate in the collection of geothermal energy. In the process of geothermal collection in the saline-alkali land area, this device condenses the generated steam into desalinated fresh water and flows it back 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. In combination with the treatment of mixed organic matter and plants 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative labor:

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

[0032] Figure 2 For the present invention Figure 1 A partial enlarged view of the middle part;

[0033] Figure 3 For the present invention Figure 1 A partial enlarged view of point B in the middle;

[0034] Figure 4 For the present invention Figure 1 A partial enlarged view of point C in the middle;

[0035] Figure 5 For the present invention Figure 1 A partial enlarged view of point D in the middle;

[0036] Among them, 1. heat exchange station; 2. hollow pile; 3. conical cap; 4. heat exchange pile; 5. water inlet; 6. filter element; 7. hot water chamber after filtration; 8. saline cold water chamber; 9. heat exchange tube; 10. geothermal heat exchange chamber; 11. water pump; 12. insulation cotton; 13. cold water return pipe; 14. hot water inlet pipe; 15. saline hot water chamber; 16. partition. DETAILED DESCRIPTION

[0037] In traditional technology, there is a filtering device for improving saline-alkali land, which includes a box body, a filter bin is opened inside the box body, a first motor is fixedly connected inside the box body, a threaded rod is fixedly connected to the surface of the first motor output shaft, a first rotating shaft is fixedly connected to the surface of the threaded rod, a first bearing is sleeved on the surface of the first rotating shaft, a fixed plate is threadedly connected to the surface of the threaded rod, a sliding rod is fixedly connected inside the box body, the fixed plate is sleeved on the surface of the sliding rod, a filter box is fixedly connected to the upper surface of the fixed plate, a filter plate is fixedly connected inside the filter box, a movable groove is opened on the surface of the filter bin, the filter box is inserted into the movable groove, a conveying box is inserted on the surface of the filter bin, an engine bin is opened inside the conveying box, and a second motor is fixedly connected inside the engine bin.

[0038] When using the above-mentioned filtering 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 uniformly transported to the outside, and the remaining saline-alkali water is transported to the filter box through the filter screen and filtered twice through the filter plate.

[0039] A second bearing is passed through the surface of the machine bin, the second motor output shaft is passed through the second bearing, a dragon is fixedly connected to the surface of the second motor output shaft, a filter is embedded in the lower surface of the conveying box, a water inlet pipe is passed through the upper surface of the conveying box, the water inlet pipe is passed through the surface of the filter bin, a water pump is fixedly connected to the upper surface of the box body, the water inlet pipe of the water pump is passed through the surface of the filter bin, and the water outlet pipe of the water pump is passed through the surface of the box body.

[0040] A water supply pipe is passed through the upper surface of the box body, a fixing frame is fixedly connected to the upper surface of the box body, a third motor is fixedly connected to the surface of the fixing frame, a third bearing is passed through the upper surface of the box body, an output shaft of the third motor is passed through the third bearing, a second rotating shaft is fixedly connected to the surface of the third motor output shaft, and a stirring shaft is fixedly connected to the surface of the second rotating shaft.

[0041] There are a plurality of stirring shafts, and two of them are symmetrically fixedly connected to the surface of the second rotating shaft, and a water outlet pipe is penetrated on the surface of the box body.

[0042] The surface of the water outlet pipe is fixedly connected with a solenoid valve.

[0043] Compared with other technical solutions, this solution sets a second motor, an auger, a filter screen and a filter plate. When the device is used, people control the second motor to operate by controlling the switch, thereby driving the auger to rotate. Then people transport the saline-alkali water to the transport box through the feed pipe. Under the action of the auger, the large particles of impurities in the saline-alkali water are uniformly transported to the outside. The remaining saline-alkali water is transported to the filter box through the filter screen, and is filtered twice under the action of the filter plate. It is more efficient. Under the action of the second motor, the auger, the filter screen and the filter plate, it is easier for people to filter the saline-alkali water. By setting a first motor, a threaded rod, a fixed plate and a sliding rod, when cleaning the filter plate, people control the first motor to operate by controlling the switch, thereby driving the threaded rod to rotate. With the cooperation of the rod, the fixed plate is driven to move, so that the filter box and the filter plate are moved out, so as to facilitate the cleaning of the filter plate. Under the action of the first motor, the threaded rod, the fixed plate and the sliding rod, it is more convenient for people to clean the filter plate; by setting a water pump, a third motor and a stirring shaft, when processing the filtered saline-alkali water, people control the operation of the water pump through the control switch, and then transport the filtered saline-alkali water to the inside of the box, and then people add an appropriate amount of prepared materials to the inside of the box through the water adding pipe, and control the operation of the third motor through the control switch, thereby driving the stirring shaft to rotate, thereby stirring the saline-alkali water inside the box, accelerating the reaction of the prepared materials and the saline-alkali water, and making the filtration sedimentation separation more thorough. Under the action of the water pump, the third motor and the stirring shaft, the reaction rate is accelerated.

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

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

[0046] A plurality of slots are arranged on both sides of the inner wall of the filter box body. The plurality of slots are arranged opposite to each other in pairs, and the slots are fixedly engaged with the first filter plate and the second filter plate.

[0047] A partition is fixedly arranged in the middle of the inner part of the filter box body, a two-way through pipe is arranged in the middle of the partition, and a stirring box body is fixedly arranged on one side of the partition.

[0048] A hopper is provided at the top of the interior of the mixing box body, and two sets of shock-absorbing mechanisms are fixedly provided on one side of the interior of the mixing box body. A two-way through pipe is provided in the middle of the shock-absorbing mechanism. The shock-absorbing mechanism includes a shock-absorbing box, two compression springs, a support plate, and a spring member vertically arranged on the side wall of the shock-absorbing box, and two compression springs are horizontally arranged in the middle of the shock-absorbing box.

[0049] One end of the spring piece is fixedly connected with a connecting rod, one end of the connecting rod is movably connected with a supporting plate, and a rotating shaft is arranged at the connection between the connecting rod and the supporting 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 an output end of the motor is connected to the stirring mechanism.

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

[0052] The filtering device for improving saline-alkali land can filter the water in the saline-alkali land multiple times through multiple groups of filter plates arranged inside the filter box body, thereby improving the filtering quality of saline-alkali water. A booster pump is connected to the tail water outlet of the filter box body, and the booster pump can be connected to the nozzles on the mounting plate through water pipes. The number of nozzles is several, and the nozzles are arranged horizontally, so as to ensure a large range and high efficiency for irrigation of plants in the later stage. The booster pump can compress and pressurize the filtered water, and the water can be further treated by the nozzles themselves to achieve long-range irrigation of distant plants, thereby greatly improving the efficiency of irrigation.

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

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

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

[0057] Heat exchange station 1;

[0058] A plurality of geothermal heat collection and desalination devices are connected to the heat exchange station 1. The geothermal heat collection and desalination devices are buried in the saline-alkali land. The bottom of the buried geothermal heat collection and desalination devices extends into the geothermal layer. The geothermal heat collection and desalination devices collect geothermal energy and then transport it to the heat exchange station 1.

[0059] The geothermal collection and desalination device includes:

[0060] The hollow pile 2 is buried in the saline-alkali land, and a water inlet 5 connected to the saline-alkali land is opened on the side wall of the hollow pile 2;

[0061] The heat exchange pile 4 is coaxially fixed to the inner side of 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 saline cold water cavity 8 is provided between the outer wall of the heat exchange pile 4 and the hollow pile 2. The saline cold water cavity 8 is connected to the outlet of the heat exchange station 1 through a cold water return pipe 13.

[0062] The heat insulation part is wrapped around the outside of the heat exchange pile 4 and is located in the saline cold water chamber 8;

[0063] The heat exchange filter part is arranged on the inner side of the heat exchange pile 4 and is connected to the inlet of the heat exchange station 1, and is used for filtering the hot brine and allowing the filtered hot brine to enter the heat exchange station 1;

[0064] The heat absorbing part is arranged at the lower inner side of the heat exchange pile 4, the water inlet end of the heat absorbing part is connected with the bottom of the saline cold water chamber 8, the heat absorbing part exchanges heat with the bottom of the heat exchange pile 4, the heat absorbing part is used to absorb geothermal energy, and the water outlet end of the heat absorbing part is connected with the water inlet end of the heat exchange filter part;

[0065] The condensation part is arranged at the steam outlet of the heat exchange and filtration part, and 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] When in use, after burying a number of hollow piles 2 in the saline-alkali land, and setting up the heat exchange piles 4, the water in the saline-alkali land enters the saline-alkali cold water chamber 8 through the water inlet 5. After the salt water enters the saline-alkali cold water chamber 8, the salt water is guided to the bottom of the heat exchange pile 4 through the heat absorption part to absorb geothermal energy, and the heated salt water is introduced into the heat exchange filter part. After the heat exchange filter part filters the hot salt water, on the one hand, the water vapor generated is moved to the condensation part for condensation, and the condensed water is desalinated fresh water, which is dripped to the surface of the saline-alkali land. On the other hand, the filtered salt water enters the heat exchange station 1 to utilize its thermal energy. After the thermal 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 the collection of geothermal energy. In the process of geothermal collection in the saline-alkali land area, the device condenses the generated steam into desalinated fresh water and flows it back 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. In combination with the treatment of mixing organic matter and plants 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 set up and before use, fresh water is used to flood the surface of the saline-alkali land. The fresh water penetrates downward to carry away the salt in the surface of the saline-alkali land, so that the salt water can enter the saline-alkali cold water chamber 8 through the water inlet 5.

[0068] As an optional embodiment, a partition 16 is axially connected to the middle part of the inner side of the heat exchange pile 4, and 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, and the heat exchange filter part is located in the filter chamber.

[0069] As an optional embodiment, the heat exchange and filtration unit 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 a filtered hot water chamber 7 located above and a saline-alkali 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-alkali hot water chamber 15.

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

[0072] The condensation part is located at the open top of the filtered hot water chamber 7 .

[0073] As an optional embodiment, the condensation part 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 open 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 to the surface of the saline-alkali land.

[0074] As an optional embodiment, the heat absorption part includes:

[0075] The water pump 11 has a water outlet connected to the saline-alkali hot water chamber 15, and a water inlet connected to the water outlets of a plurality of heat exchange tubes 9. The middle of the heat exchange tubes 9 extends into the geothermal heat exchange chamber 10. The heat exchange tubes 9 are arranged for heat exchange with the geothermal heat exchange chamber 10, and the water inlet 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, and the cold brine in the saline cold water chamber 8 is pumped into the saline hot water chamber 15 through the heat exchange pipe 9. The cold brine passes through the geothermal heat exchange chamber 10. The bottom of the heat exchange pile 4 is located in the geothermal layer and can exchange heat with the geothermal source. The cold brine passing through the heat exchange pipe 9 is heated to make the brine entering the saline hot water chamber 15 high-temperature brine. As the water pump 11 continues to operate, the saline hot water chamber 15 is filled 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, and the first brine desalination filtration is realized by the filter element 6. A part of the filtered brine in the filtered hot water chamber 7 enters the hot water chamber 7 through the heat exchange pipe 9. The water inlet pipe 14 goes to the heat exchange station 1 for heat energy utilization, and the other part evaporates and moves upward to the conical cap 3. The conical cap 3 is located above the saline-alkali land and has a lower temperature. Water vapor will condense into water after contacting the bottom of the conical cap 3. The water produced by the condensation of water vapor is fresh water. The fresh water drips along the inner edge of the conical cap 3 to the surface of the saline-alkali land. On the one hand, it can replenish the moisture of the saline-alkali land. After the fresh water enters the surface layer of the saline-alkali land, it will take away the salt of the surface layer of the saline-alkali land again. In conjunction with crop planting, when watering crops, the irrigation water will also flush the surface layer of the saline-alkali land and take away the salt. The continuous operation of this device can not only effectively utilize geothermal energy, but also continuously manage the saline-alkali land.

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

[0078] As an optional implementation, a plurality of hollow piles 2 are buried in the saline-alkali land in a matrix.

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

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

[0081] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A filtering device for improving saline-alkali land, characterized in that: include: Heat exchange station (1); A plurality of geothermal energy collection and desalination devices are connected to the heat exchange station (1), the geothermal energy collection and desalination devices are buried in saline-alkali land, the bottom of the buried geothermal energy collection and desalination devices extends into the geothermal layer, and the geothermal energy collection and desalination devices collect geothermal energy and then transport it to the heat exchange station (1); The geothermal heat collection and desalination device comprises: A hollow pile (2) is buried in saline-alkali land, and a water inlet (5) connected to the saline-alkali land is provided on a side wall of the hollow pile (2); A heat exchange pile (4) is coaxially fixed to the inner side of 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 saline cold water chamber (8) is provided between the outer wall of the heat exchange pile (4) and the hollow pile (2), and the saline cold water chamber (8) is connected to the outlet of the heat exchange station (1) through a cold water return pipe (13); A heat insulation portion, wrapped around the outside of the heat exchange pile (4) and located in the saline cold water chamber (8); A heat exchange filter unit is arranged above the inner side of the heat exchange pile (4), the heat exchange filter unit 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); A heat absorbing part is arranged at the lower inner side of the heat exchange pile (4), the water inlet end of the heat absorbing part is connected to the bottom of the saline cold water chamber (8), the heat absorbing part exchanges heat with the bottom of the heat exchange pile (4), the heat absorbing part is used to absorb geothermal energy, and the water outlet end of the heat absorbing part is connected to the water inlet end of the heat exchange filter part; The condensation part is arranged at the steam outlet of the heat exchange and filtration part, and is used for condensing the water vapor generated by the hot brine and directing it to the surface layer of the saline-alkali land.

2. A filtering device for improving saline-alkali land according to claim 1, characterized in that: A partition plate (16) is axially connected to the middle part of the inner side of the heat exchange pile (4), and the partition plate (16) divides the heat exchange pile (4) into a filter chamber located at the top and a geothermal heat exchange chamber (10) located at the bottom, and the heat exchange filter part is located in the filter chamber.

3. A filtering device for improving saline-alkali land according to claim 2, characterized in that: The heat exchange and filtering part comprises: A 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-alkali hot water chamber (15) located below, the top of the filter element (6) is in communication with the filtered hot water chamber (7), and the bottom of the filter element (6) is in communication with the saline-alkali hot water chamber (15); A hot water inlet pipe (14), one end of which is in communication with one side of the filtered hot water chamber (7), and the other end of which is in communication with the inlet of the heat exchange station (1); The condensation portion is located at the open top of the filtered hot water chamber (7).

4. The filtering device for improving saline-alkali land according to claim 3, characterized in that: The condensation part comprises a conical cap (3), the conical cap (3) is axially connected to the top end of the heat exchange pile (4), and the conical cap (3) is located directly above the open end of the filtered hot water chamber (7). After water vapor contacts the conical cap (3), it condenses into water droplets and drips along the inner edge of the conical cap (3) to the surface of the saline-alkali land.

5. The filtering device for improving saline-alkali land according to claim 3, characterized in that: The heat absorption part comprises: A water pump (11), the water outlet of which is in communication with the saline-alkali hot water chamber (15), the water inlet of which is in communication with the water outlets of a plurality of heat exchange tubes (9), the middle of which extends into the geothermal heat exchange chamber (10), the heat exchange tubes (9) are arranged for heat exchange with the geothermal heat exchange chamber (10), and the water inlet of which is in communication with the bottom of the saline-alkali cold water chamber (8).

6. The filtering device for improving saline-alkali land according to claim 1, characterized in that: The heat insulation part comprises heat insulation cotton (12), and the heat insulation cotton (12) is wrapped around the outside of the heat exchange pile (4) and is located in the saline cold water chamber (8).

7. The filtering device for improving saline-alkali land according to claim 1, characterized in that: A plurality of the hollow piles (2) are buried in the saline-alkali land in a matrix.

8. The filtering device for improving saline-alkali land according to claim 1, characterized in that: A filter screen is arranged inside the water inlet (5) to prevent soil from entering.

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