Saline-alkali soil treatment device for circulating irrigation and salt leaching

Abstract

The utility model provides a saline-alkali land treatment device for circulating irrigation and salt leaching, which comprises a buried pipe and a water collecting tank which are both buried in the land; the sedimentation tank is arranged on the ground, the sedimentation tank is connected with the water collecting tank through a connecting pipe assembly, and a salt-containing water outlet and an overflow port are formed in the sedimentation tank; the irrigation assembly comprises a first irrigation pipe and a second irrigation pipe, and the first irrigation pipe is connected with the salt-containing water outlet; the desalting assembly comprises a water outlet, a heating assembly and a condensing assembly, the heating assembly is communicated with the sedimentation tank through the overflow port, the water outlet is formed in the condensing assembly, the heating assembly heats, evaporates and crystallizes liquid from the sedimentation tank, and formed steam is cooled by the condensing assembly and then becomes liquid which is discharged through the water outlet. The water outlet is connected with the second irrigation pipe. The saline-alkali soil treatment device for circulating irrigation and salt leaching solves the technical problems of high cost and high difficulty in saline-alkali soil treatment in related technologies.

Description

Technical Field

[0001] The utility model relates to the technical field of saline-alkali land salt washing and irrigation, in particular to a saline-alkali land treatment device for circulating irrigation and salt washing. Background Art

[0002] Saline-alkali land is an important land resource, but it contains a lot of salt, which makes the soil alkaline and inhibits plant growth. Therefore, the management of saline-alkali land is an important task for the development of cultivated land in my country.

[0003] At present, physical, chemical and biological methods are mainly used to treat saline-alkali land. Among them, physical methods mainly use water conservancy engineering measures, such as drainage and irrigation, to improve the salinity of the soil, which requires the extraction of a large amount of clean groundwater to dilute the saline-alkali land before reuse. Chemical methods mainly use chemical modifiers, such as gypsum and phosphate lime, to neutralize the alkalinity of the soil. However, when the modifiers are put into farmland, the salt content in the groundwater in some areas is high and cannot be directly irrigated. It is difficult to meet the agricultural water supply guarantee, making it more difficult to treat saline-alkali land.

[0004] Therefore, the prior art needs to be further developed. Utility Model Content

[0005] The purpose of the utility model is to overcome the above technical deficiencies and provide a saline-alkali land management device for circulating irrigation and salt washing to solve the technical problems of high cost and great difficulty in managing saline-alkali land in related technologies.

[0006] In order to achieve the above technical objectives, the utility model adopts the following technical solutions: a saline-alkali land management device for circulating irrigation and salt washing is provided, comprising: an underground pipe and a water collecting tank, both of which are buried in the ground, and the underground pipe is used to introduce liquid into the water collecting tank; a sedimentation tank, which is arranged on the ground, connected to the water collecting tank through a connecting pipe assembly, and provided with a salt-containing drain outlet and an overflow outlet; an irrigation assembly, which comprises a first irrigation pipe and a second irrigation pipe, and liquids in the first irrigation pipe and the second irrigation pipe are both used for irrigating the land, and the first irrigation pipe is connected to the salt-containing drain outlet; a desalination assembly, which comprises a drain outlet, and the desalination assembly comprises a heating assembly and a condensation assembly, the heating assembly is connected to the sedimentation tank through the overflow outlet, and the drain outlet is arranged on the condensation assembly, the heating assembly heats the liquid from the sedimentation tank to evaporate and crystallize, and the formed steam is cooled by the condensation assembly and then becomes liquid, and is discharged through the drain outlet, and the drain outlet is connected to the second irrigation pipe.

[0007] Furthermore, the heating assembly includes: a heating box, which is connected to the sedimentation tank through an overflow port; a heating plate, which is arranged in the heating box and is used to heat the liquid in the heating box; a steam port, which is arranged on the heating box and the steam generated in the heating box is discharged through the steam port.

[0008] Furthermore, the condensation component includes: a radiator, which is arranged corresponding to the steam port to cool and dissipate the steam into liquid; a water tank, which is arranged below the radiator to receive the condensed liquid from the radiator, and the drain port is arranged on the water tank.

[0009] Furthermore, the irrigation assembly also includes a regulating valve, which is arranged on the first irrigation pipe and is used to adjust the liquid flow at the salt-containing drainage outlet.

[0010] Furthermore, the irrigation assembly also includes: a third irrigation pipe, to which the first irrigation pipe and the second irrigation pipe are both connected; a drip irrigation belt, to which the drip irrigation belt is connected; and a liquid mixer, which is arranged on the third irrigation pipe and is used to mix liquids from the first irrigation pipe and the second irrigation pipe.

[0011] Furthermore, it also includes a solar cell group, which is connected to the heating plate through a cable, and supplies power to the heating plate through the solar cell group.

[0012] Furthermore, the connecting pipe assembly includes: a water suction pipe connected to the water collection tank; a water pump, which is arranged on the water suction pipe; a water supply pipe, one end of which is connected to the water suction pipe and the other end of which is connected to the sedimentation tank.

[0013] Furthermore, a first liquid level sensor is provided in the sedimentation tank, and the first liquid level sensor is used to monitor the liquid level in the sedimentation tank. The saline-alkali land management device for circulating irrigation and salt washing also includes a controller, and the controller is respectively connected to the first liquid level sensor and the water pump signal.

[0014] Furthermore, a second liquid level sensor is provided in the heating box, which is used to monitor the liquid level in the heating box. A first switch valve is provided on the overflow port, which is used to open or close the overflow port. The controller is respectively connected to the first switch valve and the second liquid level sensor signal.

[0015] Furthermore, a third liquid level sensor is arranged in the water tank, which is used to monitor the liquid level in the water tank. A second switch valve is arranged on the drain outlet, which is used to open or close the drain outlet. The controller is respectively connected to the second switch valve, the regulating valve and the third liquid level sensor signal.

[0016] Beneficial effects:

[0017] 1. The saline-alkali land treatment device of the utility model for circulating irrigation and washing salt is used to wash the surface salt. The salt deep underground can be pumped out by pumping water, condensed in the heating box, and the crystallized salt in the heating box is cleaned regularly, thereby removing the salt in the saline-alkali land. This method can not only effectively reduce the salinity of saline-alkali land, but also greatly save water resources compared with traditional water conservancy engineering measures. It is especially suitable for saline-alkali land areas in the Hetao Plain and Songnen Plain with sufficient underground salt brine, greatly reducing the cost of treating saline-alkali land, and the device structure is simple and easy to operate.

[0018] 2. The saline-alkali land treatment device of the utility model for circulating irrigation and salt washing makes full use of the saline brine in some severe saline-alkali land, obtains clean water by continuously evaporating the brine, and uses the clean water mixed with part of the saline brine to irrigate the field. This device can not only reduce the salinity in the saline-alkali land, but also avoid the soil structure damage and environmental pollution problems that may be caused by chemical improvement.

[0019] 3. The saline-alkali land treatment device of the utility model for circulating irrigation and salt washing can be used for a long time to prevent soil from returning to salt after the treatment is completed.

[0020] 4. The saline-alkali land management device for circulating irrigation and salt washing of the utility model adopts an intelligent controller, which does not require a large amount of manpower for care, and only requires regular maintenance and cleaning of the salt-alkali agglomerates in the heating box. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of a saline-alkali land treatment device for circulating irrigation and salt washing adopted in an embodiment of the utility model.

[0022] The above drawings include the following reference numerals:

[0023] 1. Underground pipe; 2. Water collecting tank; 3. Suction pipe; 4. Suction pump; 5. Water supply pipe; 6. Sedimentation tank; 7. First liquid level sensor; 8. Salt drain outlet; 9. Overflow outlet; 10. Mud outlet; 11. Solar cell group; 12. Cable; 13. Heating box; 14. Heating plate; 15. Second liquid level sensor; 16. Steam outlet; 17. Rain cover; 18. Radiator; 19. Water storage tank; 20. Drain outlet; 21. Third liquid level sensor; 22. First irrigation pipe; 23. Regulating valve; 24. Liquid mixer; 25. Drip irrigation belt; 26. Straw; 27. Second irrigation pipe; 28. Third irrigation pipe. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0025] According to the embodiment of the utility model, a saline-alkali land treatment device for circulating irrigation and washing salt is provided. Figure 1 , including: a buried pipe 1 and a water collecting tank 2, both of which are buried in the ground, and the buried pipe 1 is used to pass liquid into the water collecting tank 2; a sedimentation tank 6, which is arranged on the ground and connected to the water collecting tank 2 through a connecting pipe assembly, and a salt drain outlet 8 and an overflow outlet 9 are arranged on the sedimentation tank 6; an irrigation assembly, the irrigation assembly includes a first irrigation pipe 22 and a second irrigation pipe 27, and the liquid in the first irrigation pipe 22 and the second irrigation pipe 27 is used to irrigate the land, and the first irrigation pipe 22 is connected to the salt drain outlet 8; a desalination assembly, the desalination assembly includes a drain outlet 20, the desalination assembly includes a heating assembly and a condensation assembly, the heating assembly is connected to the sedimentation tank 6 through the overflow outlet 9, the drain outlet 20 is arranged on the condensation assembly, the heating assembly heats the liquid from the sedimentation tank 6 for evaporation and crystallization, and the formed steam is cooled by the condensation assembly and then becomes liquid, and is discharged through the drain outlet 20, and the drain outlet 20 is connected to the second irrigation pipe 27.

[0026] In the saline-alkali land treatment device for circulating irrigation and salt washing of this embodiment, the underground pipe 1 is laid at intervals in the saline-alkali land, and the water with high salt content entering the underground pipe 1 is concentrated and flows into the water collection tank 2. The water collection tank 2 is connected to the sedimentation tank 6, and the water with high salt content is passed into the sedimentation tank 6 on the ground. The sedimentation tank 6 is provided with two flow ports, one is the salt drain port 8, and the other is the overflow port 9. The sedimentation tank 6 is connected to the overflow port 9, and the water with high salt content flows to the desalination component through the overflow port 9. After evaporation and crystallization of the desalination component, the salt is agglomerated, and the formed steam is cooled and cooled by the condensation component and then becomes liquid. At this time, the salt content of the liquid water is significantly reduced after desalination treatment, and low-salt liquid water is formed and flows out from the drain port 20, and the drain port 20 is connected to the second irrigation pipe 27. A mud outlet 10 is provided at the bottom of the sedimentation tank 6, and the mud and sand settled at the bottom are discharged through the mud outlet 10. The salt drain outlet 8 is connected to the first irrigation pipe 22. The water in the saline-alkali land flows from the water collection tank 2 into the sedimentation tank 6. A part of the water flows directly from the salt drain outlet 8 into the first irrigation pipe 22, and the other part flows into the desalination component from the overflow port 9. After desalination, the water with a lower salt content flows into the second irrigation pipe 27. The water in the first irrigation pipe 22 and the second irrigation pipe 27 flows into the saline-alkali land again. Part of the water is crystallized and agglomerated through the desalination component to reduce the salt content. The desalination component works in a reciprocating manner, thereby continuously leaching salt and reducing the surface salt content, thereby achieving the purpose of treating saline-alkali land. The operation is simple and economical. The saline-alkali land treatment device for circulating irrigation and salt washing in this embodiment solves the technical problems of high cost and difficulty in treating saline-alkali land in the related art.

[0027] In this embodiment, the buried pipe 1 is made of PVC material, with a diameter of DN100, a screen on the outside, a screen seam thickness of 1mm, a screen rate of 80%, a single pipe length of 5m, threaded connection at both ends, and a layer of geotextile wrapped outside. The buried depth is at the initial water level, and the top of the buried pipe 1 is flush with the initial water level. The water collection tank 2 is connected to the buried pipe 1, and the water collected in the buried pipe 1 can flow into the water collection tank 2. The material of the water collection tank 2 is a PE barrel with a volume of 0.5m 3 The sedimentation tank 6 adopts masonry concrete structure and stainless steel structure; the volume of the sedimentation tank 6 is 2m 3 , the height is set to 2m.

[0028] In this embodiment, the height of the overflow port 9 is lower than that of the salt drain port 8. The salt drain port 8 of the sedimentation tank 6 is located at a height of 1.2 m in the sedimentation tank, with an outlet radius of 2.5 cm. The height of the overflow port 9 is 1 m, with an outlet radius of 2.5 cm. This arrangement allows the water entering the sedimentation tank 6 to enter the desalination component first for desalination treatment.

[0029] See also Figure 1In the saline-alkali land treatment device for circulating irrigation and salt washing of this embodiment, the heating component includes: a heating box 13, which is connected to the sedimentation tank 6 through the overflow port 9; a heating plate 14, which is arranged in the heating box 13 and is used to heat the liquid in the heating box 13; a steam port 16, which is arranged on the heating box 13, and the steam generated in the heating box 13 is discharged through the steam port 16. The sedimentation tank 6 is connected to the heating box 13, and the salt-containing water flowing into the heating box 13 from the overflow port 9 is heated and evaporated by the heating plate 14, and the formed water vapor is discharged from the steam port 16. After being heated by the heating box 13, the salt is continuously evaporated and formed, and large pieces of salt crystals will appear inside, which can be cleaned regularly.

[0030] In this embodiment, the volume of the heating box 13 is 1m 3 , height 1m, made of iron, with polyurethane insulation layer wrapped on the outside.

[0031] See also Figure 1 In the saline-alkali land treatment device for circulating irrigation and salt washing of this embodiment, the condensation component includes: a radiator 18, which is arranged corresponding to the steam port 16 to cool and dissipate the steam into liquid; a water storage tank 19, which is arranged below the radiator 18 to receive the condensed liquid from the radiator 18, and a drain port 20 is arranged on the water storage tank 19. The water vapor discharged from the steam port 16 condenses through the radiator 18 to form liquid water, drips into the water storage tank 19, and is finally discharged from the drain port 20.

[0032] In this embodiment, a rain cover 17 is provided on the upper part of the water tank 18 to shield the water tank 19. The material of the water tank 19 can be iron, PE or stainless steel, with a volume of 1m 3 , height 0.8m. A disc radiator 18 is connected to the top of the water tank 19. The disc radiator 18 is made of stainless steel pipe with an inner diameter of 10mm. The top of the radiator 18 is connected to the heating box 13 and the pipe is upturned to prevent the hot water in the heating box 13 from pouring into the disc radiator 18. There is a drain outlet 20 at the bottom of the water tank 19, and the radius of the drain outlet 20 is 2.5cm.

[0033] See also Figure 1 In the saline-alkali land treatment device for circulating irrigation and salt washing of this embodiment, the irrigation component also includes a regulating valve 23, which is arranged on the first irrigation pipe 22 and is used to adjust the liquid flow at the saline drain outlet 8. By regularly testing the mixed water flowing into the saline-alkali land from the first irrigation pipe 22 and the second irrigation pipe 27, if the salt content is high, the opening of the regulating valve 23 is reduced to ensure that the salt content of the water entering the saline-alkali land again is within an appropriate range.

[0034] See also Figure 1In the saline-alkali land treatment device for circulating irrigation and salt washing of this embodiment, the irrigation assembly further includes: a third irrigation pipe 28, the first irrigation pipe 22 and the second irrigation pipe 27 are both connected to the third irrigation pipe 28; a drip irrigation belt 25, the drip irrigation belt 25 is connected to the third irrigation pipe 28; a liquid mixer 24, the liquid mixer 24 is arranged on the third irrigation pipe 28, and the liquid mixer 24 is used to mix the liquid from the first irrigation pipe 22 and the second irrigation pipe 27. The liquid mixer 24 is arranged to facilitate mixing the salt water from the first irrigation pipe 22 and the desalted water from the second irrigation pipe 27, so that the mixed water flows into the field evenly through the third irrigation pipe 28.

[0035] In this embodiment, a drip irrigation belt 25 is used to drip irrigation water into the farmland, and the third irrigation pipe 28 is connected to the drip irrigation belt 25, and the drip irrigation belt is placed in the field. The material of the drip irrigation belt is DN16PVC pipe or LDPE material, the drip hole spacing is 0.5m, and the length of the drip irrigation belt 25 is determined according to the width of the field.

[0036] In this embodiment, in order to prevent a large amount of water evaporation from causing salt and alkali to migrate upward with water, straw 26, such as rice stalks, corn stalks, wheat stalks, etc., is selected to cover the farmland with a thickness of about 5 cm. The surface can be covered with wire mesh or dustproof net to prevent it from being blown away by the wind.

[0037] See also Figure 1 The saline-alkali land treatment device for circulating irrigation and salt washing of this embodiment also includes a solar cell group 11, which is connected to the heating plate 14 through a cable 12, and supplies power to the heating plate 14 through the solar cell group 11. The solar cell group 11 is used to supply power to the heating plate 14, so as to make full use of energy and save the cost of saline-alkali land treatment.

[0038] See also Figure 1 The saline-alkali land treatment device for circulating irrigation and salt washing of this embodiment includes: a water pumping pipe 3, which is connected to the water collection tank 2; a water pump 4, which is arranged on the water pumping pipe 3; a water supply pipe 5, one end of which is connected to the water pumping pipe 3, and the other end of which is connected to the sedimentation tank 6. The water pumping pipe 3 is connected to the water collection tank 2, directly passes through the ground, and is exposed 0.3m above the ground. It is connected to the water pump 4, and the water in the water collection tank 2 is sucked into the sedimentation tank 6 through the water supply pipe 5.

[0039] See also Figure 1In the saline-alkali land treatment device for circulating irrigation and salt washing of this embodiment, a first liquid level sensor 7 is arranged in the sedimentation tank 6, and the first liquid level sensor 7 is used to monitor the liquid level in the sedimentation tank 6. The saline-alkali land treatment device for circulating irrigation and salt washing also includes a controller, and the controller is respectively connected to the first liquid level sensor 7 and the pump 4 by signal. The height of the first liquid level sensor 7 is flush with the salt-containing drain outlet 8, and the height is 1.2m. When the liquid level is lower than 1.2m, the controller will automatically start the pump 4 to replenish water.

[0040] See also Figure 1 In the saline-alkali land treatment device for circulating irrigation and salt washing of this embodiment, a second liquid level sensor 15 is provided in the heating box 13, and the second liquid level sensor 15 is used to monitor the liquid level in the heating box 13. A first switch valve is provided on the overflow port 9, and the first switch valve is used to open or close the overflow port 9. The controller is respectively connected to the first switch valve and the second liquid level sensor 15 by signal. The second liquid level sensor 15 is located slightly above the heating box 13, with a height of 0.8m. When the liquid level is lower than 0.8m, the controller opens the first switch valve on the overflow port 9 to replenish water into the heating box 13, and stops when the water level reaches the height of the overflow port 9.

[0041] See also Figure 1 In the saline-alkali land treatment device for circulating irrigation and salt washing of this embodiment, a third liquid level sensor 21 is arranged in the water storage tank 19, and the third liquid level sensor 21 is used to monitor the liquid level in the water storage tank 19. A second switch valve is arranged on the drain outlet 20, and the second switch valve is used to open or close the drain outlet 20. The controller is respectively connected to the second switch valve, the regulating valve 23 and the third liquid level sensor 21 by signal. The third liquid level sensor 21 is installed on the top of the water storage tank 19. When the liquid level reaches a certain height, the controller opens the second switch valve, and the drain outlet 20 is used to drain water. The water in the sedimentation tank 6 and the desalted water in the water storage tank 19 together constitute the irrigation water. The regulating valve 23 can adjust the water flow rate. The drain outlet 20 of the water storage tank 19 does not need valve adjustment, and only needs to be opened and closed by the second switch valve. The salt water in the sedimentation tank 6 and the desalted water in the water storage tank 19 both flow into the third irrigation pipe 28, and the conductivity of the irrigation water is measured regularly. If the conductivity is too high, the water flow rate of the sedimentation tank 6 can be appropriately reduced.

[0042] In this embodiment, the buried pipe 1 is buried according to the depth of the initial water level in the field, and the saline groundwater infiltrates into the buried pipe 1 and flows into the water collection tank 2. The saline groundwater is pumped into the sedimentation tank 6 by the pumping pipe 3 placed in the water collection tank 2 using the pump 4, and the silt is deposited in the sedimentation tank and dredged through the mud outlet 10. The clean water after sedimentation flows into the heating box 13 through the overflow port 9. When the liquid level in the sedimentation tank 6 is lower than the liquid level indicator light, the indicator light flashes. The water in the water collection tank 2 is pumped into the sedimentation tank 6 by the water pump 4 again. After the solar cell group 11 generates electricity, the water in the heating box 13 is evaporated by the electric heating plate 14 in the heating box 13. The steam enters the disc radiator 18 along the steam port 16, condenses to form desalted water and flows into the water storage tank 19. After the water level in the water storage tank 19 triggers the liquid level sensor, the salt-containing drain port 8 and the water storage tank drain port 20 are opened at the same time. The salt-containing water in the sedimentation tank 6 and the salt-free water after evaporation and condensation in the water storage tank are mixed through the liquid mixer 24. The mixed irrigation water is drip-irrigated into the field through the disc drip irrigation belt 25. The surface of the field is covered with straw 26 to prevent excessive evaporation. The irrigation water washes the surface salt into the underground and is collected by the buried pipe 1 again, flows into the water collection tank 2, and is pumped to the sedimentation tank 6 for circulation. After being heated by the heating box 13, salt is continuously evaporated and formed, and large pieces of salt crystals will appear inside, which need to be cleaned regularly. After evaporation, the device works in a reciprocating cycle, thereby continuously leaching salt, reducing the surface salt content, and achieving the purpose of treating saline-alkali land. The salt content of the mixed irrigation water is measured regularly. If the salt content is too high, the regulating valve 23 at the salt-containing drain outlet 8 can be adjusted to reduce the flow of salt-containing water flowing out of the sedimentation tank 6. Only regular maintenance is required, and a large amount of manpower is not required to save labor costs. The saline-alkali land treatment device with circulating irrigation and salt washing can be used for a long time to prevent soil salt reversal after the treatment is completed.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0044] Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments, and this embodiment will not be described in detail here.

[0045] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0046] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0047] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A saline-alkali land treatment device for circulating irrigation and salt washing, characterized in that: include: A buried pipe (1) and a water collecting pool (2), wherein the buried pipe (1) and the water collecting pool (2) are both buried in the ground, and the buried pipe (1) is used to pass liquid into the water collecting pool (2); A sedimentation tank (6), wherein the sedimentation tank (6) is arranged on the ground, the sedimentation tank (6) is connected to the water collection tank (2) via a connecting pipe assembly, and the sedimentation tank (6) is provided with a salt drain outlet (8) and an overflow outlet (9); An irrigation assembly, the irrigation assembly comprising a first irrigation pipe (22) and a second irrigation pipe (27), the liquid in the first irrigation pipe (22) and the liquid in the second irrigation pipe (27) are both used for irrigating land, and the first irrigation pipe (22) is connected to the salt-containing drainage outlet (8); A desalination component, the desalination component comprises a drain (20), the desalination component comprises a heating component and a condensation component, the heating component is connected to the sedimentation tank (6) through the overflow port (9), the drain (20) is arranged on the condensation component, the heating component heats the liquid from the sedimentation tank (6) to evaporate and crystallize, the formed steam is cooled by the condensation component and then becomes liquid, and is discharged through the drain (20), and the drain (20) is connected to the second irrigation pipe (27).

2. The saline-alkali land treatment device for circulating irrigation and salt washing according to claim 1 is characterized in that: The heating assembly comprises: A heating box (13), wherein the heating box (13) is connected to the sedimentation tank (6) through the overflow port (9); A heating plate (14), the heating plate (14) being arranged in the heating box (13), the heating plate (14) being used to heat the liquid in the heating box (13); A steam port (16), wherein the steam port (16) is arranged on the heating box (13), and the steam generated in the heating box (13) is discharged through the steam port (16).

3. The saline-alkali land treatment device for circulating irrigation and salt washing according to claim 2 is characterized in that: The condensing assembly comprises: A radiator (18), the radiator (18) being arranged corresponding to the steam port (16) to cool and dissipate the steam to convert it into liquid; A water storage tank (19) is arranged below the radiator (18) to receive condensed liquid from the radiator (18), and the drain port (20) is arranged on the water storage tank (19).

4. The saline-alkali land treatment device for circulating irrigation and salt washing according to claim 3 is characterized in that: The irrigation assembly further comprises a regulating valve (23), wherein the regulating valve (23) is arranged on the first irrigation pipe (22), and the regulating valve (23) is used to regulate the liquid flow at the salt-containing drainage outlet (8).

5. The saline-alkali land treatment device for circulating irrigation and salt washing according to claim 4 is characterized in that: The irrigation assembly also includes: a third irrigation pipe (28), the first irrigation pipe (22) and the second irrigation pipe (27) being connected to the third irrigation pipe (28); A drip irrigation belt (25), wherein the drip irrigation belt (25) is connected to the third irrigation pipe (28); A liquid mixer (24), the liquid mixer (24) is arranged on the third irrigation pipe (28), and the liquid mixer (24) is used to mix the liquid from the first irrigation pipe (22) and the second irrigation pipe (27).

6. The saline-alkali land treatment device for circulating irrigation and salt washing according to claim 2 is characterized in that: It also comprises a solar cell group (11), wherein the solar cell group (11) is connected to the heating plate (14) via a cable (12), and the solar cell group (11) supplies power to the heating plate (14).

7. The saline-alkali land treatment device for circulating irrigation and salt washing according to claim 4 is characterized in that: The connecting pipe assembly comprises: A water pumping pipe (3), the water pumping pipe (3) being connected to the water collecting tank (2); A water pump (4), wherein the water pump (4) is arranged on the water pump pipe (3); A water supply pipe (5), one end of which is connected to the water pumping pipe (3), and the other end of which is connected to the sedimentation tank (6).

8. The saline-alkali land treatment device for circulating irrigation and salt washing according to claim 7 is characterized in that: A first liquid level sensor (7) is arranged in the sedimentation tank (6), and the first liquid level sensor (7) is used to monitor the liquid level in the sedimentation tank (6). The saline-alkali land treatment device for circulating irrigation and salt washing also includes a controller, and the controller is respectively connected to the first liquid level sensor (7) and the water pump (4) by signal.

9. The saline-alkali land treatment device for circulating irrigation and salt washing according to claim 8 is characterized in that: A second liquid level sensor (15) is arranged in the heating box (13), and the second liquid level sensor (15) is used to monitor the liquid level in the heating box (13). A first switch valve is arranged on the overflow port (9), and the first switch valve is used to open or close the overflow port (9). The controller is respectively connected to the first switch valve and the second liquid level sensor (15) by signals.

10. The saline-alkali land treatment device for circulating irrigation and salt washing according to claim 9 is characterized in that: A third liquid level sensor (21) is arranged in the water storage tank (19), and the third liquid level sensor (21) is used to monitor the liquid level in the water storage tank (19). A second switch valve is arranged on the drain outlet (20), and the second switch valve is used to open or close the drain outlet (20). The controller is respectively connected to the second switch valve, the regulating valve (23) and the third liquid level sensor (21) by signals.

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