Artificial microenvironment desalination and water and salt resource utilization device and method

Abstract

This invention discloses an artificial microenvironment desalination and water-salt resource utilization device and method, belonging to the technical field of saline-alkali soil treatment and resource recovery equipment. It includes a water supply system, a cold chamber, and a hot chamber. The hot chamber is placed on the desalinated soil, forming a sealed environment, and the light coverage of the entire hot chamber is controlled. The water supply system is used to irrigate the desalinated soil below the hot chamber. A cold chamber is installed on one side of the hot chamber, and a first dehumidifier is installed in the cold chamber. The air inlet of the first dehumidifier is connected to an exhaust fan installed near the top of the hot chamber via an exhaust pipe, and the air outlet of the first dehumidifier is connected to an air supply fan near the bottom of the hot chamber. This invention uses underground irrigation to dissolve salts in the soil at different depths, and then utilizes natural sunlight radiation and soil water potential as driving forces to drive the saline water in the soil to the soil surface. Crystallized salts are then manually scraped off, realizing the resource utilization of soil salts and solving the problems of high cost, low efficiency, and difficult desalination in existing saline-alkali land improvement methods.

Description

Technical Field

[0001] This invention relates to the technical field of saline-alkali soil treatment and salt resource recovery equipment, specifically to an artificial microenvironment desalination and water-salt resource recovery device, and also to a desalination method for the artificial microenvironment desalination and water-salt resource recovery device. Background Technology

[0002] The primary goal of saline-alkali land improvement is to reduce soil salinity. This is a complex systemic project requiring comprehensive consideration of various improvement measures, including physical, irrigation, biological, and chemical methods. Currently, the main measures include irrigation desalination, and physical, chemical, and biological measures to reduce soil salinity. Although various saline-alkali land improvement technologies have been proposed and applied, each technology has its applicable scope and limitations. Chemical and physical desalination methods, in particular, require high technological investment and costs; while biological improvement is slow, with uncertain long-term effects, making widespread adoption difficult. Furthermore, soil salinization is recurrent; after improvement, long-term and continuous regulation and management are essential, otherwise the soil can easily re-salinate.

[0003] High salt concentrations in agricultural production cause "physiological drought" in crops, making it difficult for roots to absorb water and even leading to dehydration and death. Through preliminary experimental observations and analysis of empirical data, the inventors have determined that among natural factors, drought and strong evaporation are the core driving forces. In areas where precipitation is far lower than evaporation, groundwater carrying salt rises with capillary water and accumulates on the surface, forming a salt crust. Based on this process, the inventors have developed related technologies to utilize the natural force of radiation to drive evaporation on the surface. By using engineering methods to improve the evaporation efficiency of the soil surface, salt in the soil can be driven to the surface layer, and then the surface salt can be collected and the water recycled. This would achieve efficient removal of salt from the soil and the resource recovery of water and salt. However, to date, no related salt extraction and collection technologies and equipment have been reported. Summary of the Invention

[0004] The first objective of this invention is to provide an artificial microenvironment desalination and water-salt resource utilization device, which improves soil surface evaporation efficiency and water-salt resource utilization by creating an artificial microenvironment on saline-alkali land, thereby solving the problems of high cost, low efficiency and difficulty in desalination in existing saline-alkali land improvement.

[0005] To achieve the first objective, the technical solution adopted by this invention is as follows: an artificial microenvironment desalination and water-salt resource utilization device, comprising a water supply system, a cold chamber, and a hot chamber. The hot chamber is placed on the desalinated soil and forms a sealed environment with it, and the light can cover the entire hot chamber. The water supply system is used to irrigate the desalinated soil below the hot chamber. The cold chamber is installed on one side of the hot chamber. A first dehumidifier is installed in the cold chamber. The air inlet of the first dehumidifier is connected to an exhaust fan installed near the top of the hot chamber through an exhaust pipe. The air outlet of the first dehumidifier is connected to the bottom of the hot chamber through an air supply fan. The first dehumidifier is used to dehumidify and temperature control the high-temperature and high-humidity air in the hot chamber, and to send the dehumidified medium-temperature dry air into the hot chamber.

[0006] Furthermore, the aforementioned water supply system includes a water source, irrigation devices, and a first water pump. The irrigation devices are connected to the water source via water supply pipes and the first water pump. Multiple irrigation devices are used and arranged within the desalination soil.

[0007] Furthermore, the aforementioned first dehumidifier includes a casing and a heat exchange layer. The heat exchange layer is installed inside the casing and has a cold water inlet and a cold water outlet. The casing is fixedly connected to the cold room by a bracket. An air inlet is provided at the top of the casing and is connected to an exhaust fan through a pipe. An air outlet is provided at the bottom of the casing and is connected to a supply fan through a pipe. A liquid collection hopper with an open top is also installed inside the casing. The liquid collection hopper is located directly below the heat exchange layer and is connected to the outside of the cold room through a water outlet pipe.

[0008] Furthermore, the outlet of the aforementioned liquid collection hopper is connected to a water source via an outlet pipe.

[0009] Furthermore, the aforementioned cold water inlet is connected to a second water pump via a pipeline, the second water pump is connected to groundwater or liquid refrigerant, and the cold water outlet is connected to groundwater or liquid refrigerant via a pipeline.

[0010] Furthermore, the first dehumidifier is replaced by a second dehumidifier, which is installed outdoors. The air inlet of the second dehumidifier is connected to the hot air outlet of the heat exchanger through a pipe. The hot air inlet of the heat exchanger is connected to the exhaust fan through a pipe. The air outlet of the second dehumidifier is connected to the cold air inlet of the heat exchanger through a pipe. The preheated gas outlet of the heat exchanger is connected to the air supply fan through a pipe.

[0011] Furthermore, the outlet of the aforementioned air supply fan is connected to an air guide pipe, which is laid above the desalinated soil.

[0012] Furthermore, the aforementioned cold chamber includes an upper roof, a right insulation wall, a left insulation wall, and a rear insulation wall. One end of the right insulation wall and the left insulation wall are connected to the rear vertical wall of the hot chamber, and the other end is fixedly connected to the rear insulation wall, which is flush with them. The upper roof is sealed and covers the right insulation wall, the left insulation wall, and the rear insulation wall, forming a sealed space with the rear vertical wall of the hot chamber.

[0013] Furthermore, the aforementioned hot chamber includes a one-way transparent membrane, a left insulation wall, a right insulation wall, and a rear vertical wall. The left and right insulation walls are arc-shaped structures, namely, they include a vertical side, a bottom horizontal side, and an arc-shaped side extending from the top of the vertical side to the end of the bottom horizontal side. The left and right insulation walls are symmetrically arranged on the left and right sides of the rear vertical wall, and a support frame is fixedly connected between the two arc-shaped sides. The support frame is covered with a one-way transparent membrane.

[0014] The second objective of this invention is to provide a desalination method for an artificial microenvironment desalination and water-salt resource recovery device, which can quickly and reliably perform desalination and salt resource recovery.

[0015] Regarding the second objective of the invention, the technical solution adopted by the present invention is as follows: a desalination method using the above-mentioned artificial microenvironment desalination and water-salt resource utilization device. The method is as follows: fresh water (slightly saline water) is transported to the soil layer of the desalinated soil by the water supply system, which causes the salt in the desalinated soil to dissolve in the soil water. The soil surface radiation energy generated by the hot chamber and the soil water potential drive the soil water to move along the soil pores and capillaries towards the soil surface. The soil water that reaches the soil surface vaporizes into gaseous steam when it encounters the high temperature and dry air on the ground. The salt in the soil water crystallizes and remains on the soil surface due to loss of water. The hot air generated by the hot chamber is dehumidified by the dehumidifier in the cold chamber and then circulated back into the hot chamber.

[0016] The beneficial effects of this invention are as follows: Compared with the prior art, this invention utilizes underground irrigation technology to dissolve the salt in the soil into soil water. It uses both the natural force of radiation evaporation and the natural force of soil water potential to drive the soil water to the soil surface. The high temperature and dry air at ground level cause the water to vaporize into gaseous steam, while the salt in the soil water crystallizes and remains on the soil surface due to the loss of water, thus separating water and salt. This solves the problems of high cost, low efficiency and incomplete desalination in existing saline-alkali land improvement methods. Attached Figure Description

[0017] Figure 1 A three-dimensional structural diagram of an artificial microenvironment desalination and water-salt resource recovery device;

[0018] Figure 2 A schematic diagram of the cross-sectional structure of an artificial microenvironment desalination and water-salt resource recovery device;

[0019] Figure 3 A three-dimensional schematic diagram of the construction of an artificial microenvironment desalination and water-salt resource utilization device;

[0020] Figure 4 This is a three-dimensional structural diagram of the first dehumidifier;

[0021] Figure 5 This is an application diagram of the first dehumidifier;

[0022] Figure 6 This is a three-dimensional structural diagram of a heat exchange type second dehumidifier;

[0023] Figure 7 This is an application diagram of a heat exchange type secondary dehumidifier;

[0024] Figure 8 To adopt Figure 4 The experimental results of the artificial microenvironment desalination and water-salt resource utilization device are shown in the figure. (a) Desalinated soil before treatment, (b) Desalinated soil after one week of treatment, and (c) Desalinated soil after two weeks of desalination.

[0025] Figure 9 This graph shows the changes in electrical conductivity values ​​measured in soil samples three times consecutively, with each measurement spaced one week apart.

[0026] Figure label:

[0027] 1. Water source, 2. Cold room, 3. Hot room, 4. First dehumidifier, 5. Exhaust fan, 6. Air supply fan, 7. Exhaust pipe, 8. Air supply pipe, 9. Air guide pipe, 10. Air inlet, 11. Water injector, 12. Water supply pipe, 13. High temperature and high humidity air, 14. Medium temperature and dry air, 15. Water outlet pipe, 16. Radiant energy, 17. Soil water potential, 18. Soil sensor, 19. Air sensor, 20. First water pump, 21. Groundwater, 22. Second water pump, 24. Water supply pipe, 25. Return water pipe, 26. Thermal insulation coating, 27. Desalinated soil;

[0028] 201. Top; 202. Right insulation wall; 203. Left insulation wall; 204. Rear insulation wall;

[0029] 301. One-way light transmission membrane; 302. Right insulation wall; 303. Left insulation wall; 304. Rear side wall.

[0030] 401. Air inlet; 402. Air outlet; 403. Drain outlet; 404. Cold water inlet; 405. Cold water outlet; 406. Heat exchange layer; 407. Heat exchanger; 4071. Heat exchanger tube-side inlet (hot air inlet); 4072. Heat exchanger tube-side outlet (hot air outlet); 4073. Heat exchanger shell-side inlet (cold air inlet); 4074. Heat exchanger shell-side outlet. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] The inventive concept of this invention is to address the technical problems of "high cost, low efficiency, and incomplete desalination in existing saline-alkali land improvement methods." This invention provides an artificial microenvironment desalination and water-salt resource recovery device. This device utilizes underground irrigation technology to dissolve salts in the soil into soil water. It uses both radiative evaporation and soil water potential forces to drive the soil water to the soil surface. The high temperature and dryness of the ground cause the air to vaporize into gaseous steam, while the salts in the soil water crystallize and remain on the soil surface due to water loss, thus separating water and salts. This solves the problems of high cost, low efficiency, and incomplete desalination in existing saline-alkali land improvement methods. See Examples 1-2 for details. Example 1: As shown... Figure 1-7 As shown, an artificial microenvironment desalination and water-salt resource recovery device includes a water supply system, a cold chamber 2, and a hot chamber 3. The cold chamber 2 and hot chamber 3 are placed on desalinated soil 27 in farmland and form a closed environment with it. The light (radiation energy 16) can cover the entire hot chamber 3. The water supply system is used to irrigate the desalinated soil 27 below the hot chamber 3. The cold chamber 2 is installed on one side of the hot chamber 3. A first dehumidifier 4 is installed in the cold chamber. The air inlet of the first dehumidifier 4 is connected to an exhaust fan 5 installed near the top of the hot chamber 3 through an exhaust pipe 7. The hot chamber 3 is connected to the first dehumidifier near the bottom through an air supply fan 6. At the air outlet of 4, the first dehumidifier 4 is used to dehumidify and temperature-control the high-temperature and high-humidity air 13 in the hot chamber 3, and send the dehumidified medium-temperature dry air 14 into the hot chamber 3. Using underground irrigation technology, the salt in the soil is dissolved in the soil water. The soil water is driven to the soil surface by the natural forces of radiation evaporation and soil water potential. The high-temperature dry air on the ground vaporizes into gaseous steam, while the salt in the soil water crystallizes and remains on the soil surface due to loss of water, thus separating water and salt. This solves the problems of high cost, low efficiency and incomplete desalination in the existing saline-alkali land improvement.

[0033] The main functions of hot chamber 3 are: ① to create a closed environment above the desalinated soil; ② to provide an infiltration network for the desalinated soil layer; ③ to provide a hot air network for the surface of the desalinated soil layer; ④ to promote soil surface evaporation efficiency; and ⑤ to provide a place for efficient convection of dry and wet air.

[0034] An exhaust fan 5 is installed on the rear wall of the hot chamber 3. The exhaust fan 5 is connected to the air inlet 401 of the first dehumidifier 4 through the exhaust pipe 7. When the air sensor 19 in the hot chamber 3 detects the air temperature and humidity, it sends the signal to the controller. The controller controls the exhaust fan 5 to transport the high temperature and high humidity air 13 in the hot chamber 3 into the first dehumidifier 4 through the exhaust pipe 7.

[0035] The main functions of the cold chamber 2 are: ① to maintain a stable low-temperature environment for the first dehumidifier 4; ② to draw in high-temperature and high-humidity air from the hot chamber; ③ to dehumidify and control the temperature of the high-temperature and high-humidity air; ④ to discharge medium-temperature and dry air into the hot chamber; and ⑤ to collect the condensate produced during dehumidification.

[0036] The air inside the hot chamber 3 heats up rapidly under the action of natural radiation energy 16, accelerating the evaporation of the soil surface and providing the first driving force for the upward transport of deep soil water. With the assistance of the second driving force of soil water potential, the soil water moves towards the soil surface. When it encounters the high temperature air in the hot chamber 3, the water in the soil water vaporizes, and the high temperature air becomes high temperature and high humidity air 13. After the water vaporizes, the salt (solute) in the soil water crystallizes and remains on the soil surface due to the reduction of solution. It is then collected and utilized as a resource. The soil moisture sensor 18 installed in the farmland 27 detects the decrease in soil moisture and sends the signal to the controller, which controls the first water pump 20 to increase the water supply to the irrigation device 11. As the irrigation device 11 continues to supply water, this process will continue until the soil sensor 18 detects that the salt in the soil has been removed to the set target and stops.

[0037] This application utilizes an irrigation device to deliver fresh water (slightly saline water) into the soil layer of desalinated soil, causing the salt in the desalinated soil to dissolve in the soil water. The soil water is driven by the surface radiation energy (sunlight) and the soil water potential to move along the soil pores and capillaries towards the soil surface. When the soil water reaches the soil surface, it vaporizes into gaseous steam when it encounters the high temperature and dry air at the ground. The salt in the soil water crystallizes and remains on the soil surface due to the loss of water. By removing the soil on the soil surface, the crystallized salt in the soil is removed.

[0038] The water supply system includes a water source 1, irrigators 11, and a first water pump 20. Irrigators 11 are connected to the water source 1 via a water supply pipe 12 and the first water pump 20. Multiple irrigators 11 are arranged within the desalination soil 27. The water source 1 refers to the fresh water provided for soil desalination; slightly brackish water can also be used. The water source 1, the first water pump 20, and the irrigators 11 are connected via the water supply pipe 12 to form a water supply path. Multiple irrigators 11 are inserted into the soil, providing a solution to the salts (solutes) in the deeper soil layers of the desalination soil 27, dissolving the salts in the soil into the soil water.

[0039] The first dehumidifier 4 includes a casing 408 and a heat exchange layer 406. The heat exchange layer 406 is multi-layered and vertically connected in series inside the casing 408. The heat exchange layer 406 has a cold water inlet 404 and a cold water outlet 405. The casing 408 is fixedly connected to the cold chamber 2 by a bracket. An air inlet 401 is provided at the top of the casing 408, which is connected to an exhaust fan 5 through an exhaust pipe 7. An air outlet 402 is provided at the bottom of the casing 408, which is connected to a blower fan 6 through a pipe. A liquid collection hopper 409 with an open top is also installed inside the casing 408. The liquid collection hopper 409 is located directly below the heat exchange layer 406 and is connected to the outside of the cold chamber 2 through the water outlet pipe 15. It collects the condensate generated by the heat exchange layer and discharges it to the outside. The outlet of the liquid collection hopper 409 is connected to the water source 1 through the water outlet pipe 15. The cold water inlet 404 is connected to the second water pump 22 through a pipe. The second water pump 22 is connected to the groundwater 21 or liquid refrigerant. The cold water outlet 405 is connected to the groundwater 21 or liquid refrigerant through a pipe. The outlet of the air supply fan 6 is connected to the air guide pipe 9. The air guide pipe 9 is laid above the desalinated soil 27 and can uniformly supply air to the hot chamber.

[0040] The air outlet 402 of the first dehumidifier 4 is connected to the air supply fan 6 (the air supply fan 6 can be omitted when the exhaust fan pressure is sufficient). The air supply fan 6 is connected to the air supply pipe 8 and the air guide pipe 9 in sequence. The air guide pipe is laid in the desalinated soil 27 of the farmland to send the dehumidified gas into the heat chamber. The drain outlet 403 of the first dehumidifier 4 is connected to the water source 1. The high temperature and high humidity air 13 entering from the air inlet 401 encounters the low temperature cold water from the cold water inlet 404 in the heat exchange layer 406, and is cooled and condensed (releasing heat energy) to form condensate and medium temperature dry air 14. The condensate flows back into the water source 1 through the drain outlet 403 and the water outlet pipe 15 for recycling and reuse. The medium temperature dry air 14 passes through the air outlet 402, the air supply fan 6, the air supply pipe 8, and the air guide pipe 9 in sequence and blows directly onto the soil surface to increase the air flow in the soil layer and enhance the evaporation intensity of the soil surface.

[0041] To simulate a cold chamber for cooling, the cold chamber includes an upper roof 201, a right insulation wall 202, a left insulation wall 203, and a rear insulation wall 204. One end of the right insulation wall 202 and the left insulation wall 203 are connected to the rear vertical wall 304 of the hot chamber 3, and the other end is fixedly connected to the rear insulation wall 204, which is flush with the hot chamber. The upper roof 201 is sealed and covers the right insulation wall 202, the left insulation wall 203, and the rear insulation wall 204, forming a sealed space with the rear vertical wall 304 of the hot chamber.

[0042] To fully simulate the microenvironment, the hot chamber 3 includes a one-way transparent membrane 301, a left insulation wall 302, a right insulation wall 303, and a rear vertical wall 304. The left insulation wall 302 and the right insulation wall 303 are arc-shaped structures, including a vertical side, a bottom horizontal side, and an arc-shaped side extending from the top of the vertical side to the end of the bottom horizontal side. The left insulation wall 302 and the right insulation wall 303 are symmetrically arranged on the left and right sides of the rear vertical wall 304. A support frame (not shown in the figure) is fixedly connected between the two arc-shaped sides. The support frame is covered with a one-way transparent membrane 301. Through the arc-shaped one-way transparent membrane, sunlight from the outside can cover the entire interior of the hot chamber. The hot chamber heats up quickly, which can promote the movement of soil water towards the surface more vigorously and can more quickly achieve the formation of crystallized salt on the soil surface.

[0043] The source of cold water for the dehumidifier 4 can be groundwater 21 or refrigerant; in small-scale applications and with sufficient funds, the dehumidifier can also be replaced with a commercial distributed central dehumidifier; to simplify the control of the dehumidifier 4, a single dehumidifier 4 can also adopt a centralized heat exchange layer 406.

[0044] In addition, further improvements to the desalination process:

[0045] Operating Condition 1: When soil pores and capillaries are blocked, soil water cannot move to the soil surface. Micro-sprinkler irrigation and other methods can be used to wet the upper surface of the soil, so that the surface water can seep downwards and merge with the soil water supplied by the deep irrigator 11, thus opening up the soil pores and capillary channels that allow soil water to move upwards.

[0046] Condition 2: When a lot of salt accumulates on the surface of the soil, a salt crust often forms, which reduces or even prevents the upward evaporation of water. In this case, manual or mechanical means should be used to scrape off the crystalline salt on the surface.

[0047] Operating Condition 3: In high-temperature environments (such as the saline-alkali land next to Xinjiang), the first dehumidifier 4 can be used. However, in areas with frequent rain and strong winds and sandstorms, the temperature of the medium-temperature dry air after being dehumidified by the first dehumidifier 4 is too low. When it is delivered to the soil surface of the hot chamber 3, it will reduce the temperature of the soil surface and reduce the evaporation effect of the soil surface. To address this issue, a heat exchanger 407 can be added to the dehumidifier to preheat the medium-temperature air 14 returning to the hot chamber using the high-temperature air 13 from the hot chamber 3.

[0048] Through experimental verification, Figure 9 It can be seen that soil salinity has been redistributed, and the salinity is gradually decreasing.

[0049] Example 2: The main structural difference from Example 1 is that the first dehumidifier 4 is replaced by a second dehumidifier 28. The second dehumidifier 28 is installed outdoors. The air inlet of the second dehumidifier 28 is connected to the hot air outlet 4072 of the heat exchanger 407 through a pipe. The hot air inlet 4071 of the heat exchanger 707 is connected to the exhaust fan 5 through a pipe. The air outlet of the second dehumidifier 28 is connected to the cold air inlet 4073 of the heat exchanger through a pipe. The preheated gas outlet 4074 of the heat exchanger 407 is connected to the air supply fan 6 through a pipe.

[0050] The reason for using the above-mentioned heat exchanger is that the first dehumidifier 4 can be used in high-temperature environments (such as the saline-alkali land next to Xinjiang). However, in areas with more rain and more sandstorms, the temperature of the medium-temperature dry air after dehumidification by the first dehumidifier 4 is too low. When it is delivered to the soil surface of the hot chamber 3, it will reduce the temperature of the soil surface, reduce the evaporation effect of the soil surface, and affect the desalination effect. To address this issue, a heat exchanger 407 can be added to the second dehumidifier 28 (or the same first dehumidifier as in Example 1). The high-temperature air 13 from the hot chamber 3 is used to preheat the medium-temperature air 14 returning to the hot chamber. This will solve the problem that in areas with more rain and more sandstorms, the air with too low a temperature after dehumidification will not enter the hot chamber and affect the desalination effect.

[0051] Example 3: A desalination method using the artificial microenvironment desalination and water-salt resource recovery device in Example 1. The method is as follows: Fresh water (slightly saline water) is transported to the soil layer of the desalinated soil by the water supply system's water emitter, causing the salt in the desalinated soil to dissolve in the soil water. The soil surface radiation energy generated by the hot chamber and the soil water potential drive the soil water to move along the soil pores and capillaries towards the soil surface. The soil water that reaches the soil surface vaporizes into gaseous steam when it encounters the high temperature and dry air on the ground. The salt in the soil water crystallizes and remains on the soil surface due to loss of water. The hot air generated by the hot chamber is dehumidified by the dehumidifier in the cold chamber and then circulated back into the hot chamber.

[0052] This application provides a desalination method for an artificial microenvironment desalination and water-salt resource recovery device, which can quickly and reliably perform desalination and salt resource recovery.

[0053] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection of the claims.

Claims

1. A device for desalination and water-salt resource recovery in an artificial microenvironment, characterized in that, It includes a water supply system, a cold chamber, and a hot chamber. The hot chamber is placed on desalinated soil and forms a sealed environment with it. The light can cover the entire hot chamber. The water supply system is used to irrigate the desalinated soil below the hot chamber. The cold chamber is installed on one side of the hot chamber. The first dehumidifier is installed in the cold chamber. The air inlet of the first dehumidifier is connected to the exhaust fan installed near the top of the hot chamber through the exhaust pipe. The air outlet of the first dehumidifier is connected to the air outlet of the hot chamber near the bottom through the air supply fan. The first dehumidifier is used to dehumidify and temperature control the high temperature and high humidity air in the hot chamber, and send the dehumidified medium temperature dry air into the hot chamber.

2. The artificial microenvironment desalination and water-salt resource recovery device according to claim 1, characterized in that, The water supply system includes a water source, irrigation devices, and a first water pump. The irrigation devices are connected to the water source through water supply pipes and the first water pump. Multiple irrigation devices are used and arranged in the desalination soil.

3. The artificial microenvironment desalination and water-salt resource recovery device according to claim 1, characterized in that, The first dehumidifier includes a casing and a heat exchange layer. The heat exchange layer is installed inside the casing and has a cold water inlet and a cold water outlet. The casing is fixedly connected to the cold room by a bracket. An air inlet is provided at the top of the casing and is connected to an exhaust fan through a pipe. An air outlet is provided at the bottom of the casing and is connected to a supply fan through a pipe. A liquid collection hopper with an open top is also installed inside the casing. The liquid collection hopper is located directly below the heat exchange layer and is connected to the outside of the cold room through a water outlet pipe.

4. The artificial microenvironment desalination and water-salt resource recovery device according to claim 3, characterized in that, The outlet of the liquid collection hopper is connected to a water source via an outlet pipe.

5. The artificial microenvironment desalination and water-salt resource recovery device according to claim 3, characterized in that, The cold water inlet is connected to the second water pump via a pipe, the second water pump is connected to groundwater or liquid refrigerant, and the cold water outlet is connected to groundwater or liquid refrigerant via a pipe.

6. The artificial microenvironment desalination and water-salt resource recovery device according to claim 1, characterized in that, The first dehumidifier is replaced by a second dehumidifier, which is installed outdoors. The air inlet of the second dehumidifier is connected to the hot air outlet of the heat exchanger through a pipe. The hot air inlet of the heat exchanger is connected to the exhaust fan through a pipe. The air outlet of the second dehumidifier is connected to the cold air inlet of the heat exchanger through a pipe. The preheated gas outlet of the heat exchanger is connected to the air supply fan through a pipe.

7. The artificial microenvironment desalination and water-salt resource recovery device according to claim 1, characterized in that, The outlet of the air blower is connected to an air guide pipe, which is laid above the desalinated soil.

8. The artificial microenvironment desalination and water-salt resource recovery device according to claim 1, characterized in that, The cold chamber includes a top, a right insulation wall, a left insulation wall, and a rear insulation wall. One end of the right and left insulation walls is connected to the rear vertical wall of the hot chamber, and the other end is fixedly connected to the rear insulation wall, which is flush with them. The top seals and covers the right, left, and rear insulation walls, forming a sealed space with the rear vertical wall of the hot chamber.

9. The artificial microenvironment desalination and water-salt resource recovery device according to claim 1, characterized in that, The hot chamber includes a one-way transparent membrane, a left insulation wall, a right insulation wall, and a rear vertical wall. The left and right insulation walls are arc-shaped structures, which include a vertical side, a bottom horizontal side, and an arc-shaped side extending from the top of the vertical side to the end of the bottom horizontal side. The left and right insulation walls are symmetrically arranged on the left and right sides of the rear vertical wall. A support frame is fixedly connected between the two arc-shaped sides, and the support frame is covered with a one-way transparent membrane.

10. A desalination method using the artificial microenvironment desalination and water-salt resource recovery device as described in any one of claims 1-9, characterized in that, The method is as follows: Fresh water (slightly saline water) is delivered to the soil layer of desalinated soil using the water supply system's water generator, causing the salt in the desalinated soil to dissolve in the soil water. The soil surface radiation energy generated by the hot chamber and the soil water potential drive the soil water to move along the soil pores and capillaries towards the soil surface. The soil water that reaches the soil surface vaporizes into gaseous steam when it encounters the high temperature and dry air on the ground. The salt in the soil water crystallizes and remains on the soil surface due to the loss of water. The hot air generated by the hot chamber is dehumidified by the dehumidifier in the cold chamber and then circulated back into the hot chamber.

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