Agricultural light complementary multipurpose comprehensive treatment irrigation and drainage system for saline-alkali soil

Abstract

The invention belongs to the technical field of saline-alkali land treatment, and particularly relates to an agriculture and light complementary multipurpose comprehensive treatment irrigation and drainage system for saline-alkali land, comprising: a planting area for planting crops or pasture; the saline-alkali soil vertical shaft drainage system is arranged in a planting area and used for discharging excessive underground water, collecting saline water, maintaining a low underground water level to restrain salt return and guaranteeing normal growth of crops. The photovoltaic power generation panel assembly is arranged above the planting area and used for reducing evaporation heat dissipation of crops or forage grass, inhibiting salt accumulation and providing electric energy; the raw water tank is used for collecting saline water; the water purification system is used for purifying and desalting saline water; the salt manufacturing system is used for preparing chemical raw materials by using concentrated water; the produced water reservoir is used for storing purified water; the irrigation system is communicated with one water outlet end of the produced water reservoir and is used for irrigating crops or pasture and the like; and the electrolytic storage system is communicated with the other water outlet end of the produced water reservoir and is used for electrolyzing the purified water to generate hydrogen and oxygen and storing the hydrogen and the oxygen.

Description

Technical Field

[0001] The invention belongs to the technical field of saline-alkali land management, and in particular relates to a multi-purpose comprehensive management irrigation and drainage system for saline-alkali land with complementary agriculture and light. Background Art

[0002] The traditional method of improving saline-alkali land is mainly to drain water through ditches, underground pipes or shafts, but this method only treats the symptoms and does not fundamentally remove the salt in the groundwater. The discharged brackish water re-enters the groundwater, causing the salt and alkali in the groundwater to return to the cultivated layer before farming every year, and the soil needs to be washed again. There are relatively mature water treatment technologies for removing salt from groundwater, but they consume a lot of electricity and are too expensive, making them impossible to use in large areas of saline-alkali land. Therefore, cheaply removing salt from saline-alkali groundwater and making it a resource is a key technology to fundamentally improve saline-alkali land. It will provide an innovative and sustainable solution for the improvement and management of saline-alkali land, which is of great significance to national food security. Therefore, we propose a multi-purpose integrated management irrigation and drainage system for saline-alkali land with complementary agriculture and light. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-purpose comprehensive irrigation and drainage system for saline-alkali land with agricultural and photovoltaic complementarity to solve the above problems.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] A multi-purpose comprehensive irrigation and drainage system for saline-alkali land with complementary agriculture and light, comprising:

[0006] Planting areas, used for growing crops or pasture;

[0007] The saline-alkali land vertical well drainage system is set up in the planting area to drain excess groundwater, collect salt water, and maintain a lower groundwater level to inhibit salt backflow and ensure normal growth of crops;

[0008] A photovoltaic panel assembly is arranged above the planting area to reduce evaporative heat dissipation of crops or pastures, inhibit salt inversion, and provide electrical energy;

[0009] Raw water tanks for salt water collection;

[0010] Water purification systems for brine purification and desalination to produce concentrated and clean water;

[0011] Salt production system, used to prepare chemical raw materials using concentrated water;

[0012] Produced water reservoir for clean water storage;

[0013] An irrigation system, connected to one of the water outlets of the water production reservoir, for irrigation of crops or pastures;

[0014] The electrolysis storage system is connected to the other water outlet end of the water production reservoir and is used to electrolyze clean water to generate hydrogen and oxygen and store them.

[0015] Preferably, the saline-alkali land vertical shaft drainage system comprises:

[0016] A vertical shaft drainage system is arranged in the planting area, and is used to drain excess groundwater in the planting area, collect salt water, and maintain a lower groundwater level to inhibit salt backflow and ensure normal growth of crops;

[0017] A pipeline system, wherein the water inlet of the pipeline system is connected to the vertical shaft drainage system, and the water outlet of the pipeline system is connected to the water inlet of the raw water pool through a water pump system, so as to transport the brine collected by the vertical shaft drainage system to the raw water pool.

[0018] Preferably, the water purification system includes a flocculation sedimentation purifier, a media filter, a filtered water supply tank, a high-pressure pump and a reverse osmosis membrane assembly which are sequentially connected, the clean water outlet of the reverse osmosis membrane assembly is connected to the water production reservoir, and the concentrated water outlet of the reverse osmosis membrane assembly is connected to the water inlet of the salt production system.

[0019] Preferably, the salt production system includes a concentrate water reservoir connected to the concentrate water outlet end of the reverse osmosis membrane assembly, the outlet end of the concentrate water reservoir is connected to a solar evaporation pool, the solar evaporation pool is used to increase the salt concentration in the concentrate, the solar evaporation pool is connected to a salt baking system, the salt baking system is electrically connected to the photovoltaic panel assembly, and the salt baking system is used to heat and evaporate the water in the high-concentration concentrate produced by the solar evaporation pool to obtain sodium sulfate.

[0020] Preferably, the electrolytic storage system comprises an electrolytic cell, the water inlet end of the electrolytic cell is connected to one of the water outlet ends of the water production reservoir, and a diaphragm is fixedly connected to the middle of the electrolytic cell for separating the electrolytic cell into a cathode electrolytic cell and an anode electrolytic cell;

[0021] The cathode electrolytic cell is provided with a cathode, and the cathode electrolytic cell is used for water electrolysis to generate hydrogen;

[0022] The anode electrolysis cell is provided with an anode, and the anode electrolysis cell is used for electrolyzing water to produce oxygen;

[0023] The cathode electrolytic cell is connected to a hydrogen collection system, and the hydrogen collection system is used to collect hydrogen; the anode electrolytic cell is connected to an oxygen gas collection system, and the oxygen gas collection system is used to collect oxygen;

[0024] The gas outlet ends of the oxygen gas collection system and the hydrogen gas collection system are connected to the gas inlet end of the processing system. The processing system includes an oxygen processing device and a hydrogen purification device. The oxygen processing device is connected to the gas outlet end of the oxygen gas collection system for oxygen collection, and the hydrogen purification device is connected to the gas outlet end of the hydrogen gas collection system for hydrogen purification and collection.

[0025] Preferably, the water inlet of the irrigation system is connected to the water outlet of the pumping system, and the water inlet of the pumping system is connected to the water outlet of the water production reservoir.

[0026] Preferably, the height of the photovoltaic panels of the photovoltaic panel assembly is 2-3 meters.

[0027] Preferably, the photovoltaic panel of the photovoltaic panel assembly has an inclination angle of 20-30 degrees.

[0028] Preferably, the distance between two adjacent photovoltaic panels of the photovoltaic panel assembly is 1.5-2 times the height of the photovoltaic panels.

[0029] Preferably, when drainage is not required and crops need irrigation, the system can switch to water purification mode to generate suitable irrigation water to ensure normal growth of crops and meet agricultural water needs.

[0030] Preferably, the system realizes multiple functions such as making salt from concentrated water to prepare chemical raw materials, storing clean water for crop irrigation, and electrolyzing clean water to generate hydrogen and oxygen through multifunctional comprehensive utilization of resources, which fully improves the utilization efficiency of resources and promotes sustainable development.

[0031] Compared with the prior art, the present invention has the following advantages and technical effects:

[0032] By planting crops or forage in the planting area, the photovoltaic panel components are scientifically set above the planting area, and the photovoltaic panels block part of the sunlight to reduce the evaporation of crops or forage, which plays a role in inhibiting anti-salinity. The photovoltaic panel components convert solar energy into electrical energy and provide electricity for the operation of the water purification system, salt production system, irrigation system, and electrolysis system. The saline-alkali land shaft drainage system will discharge excess groundwater in the planting area, collect brine, and maintain a low groundwater level to inhibit anti-salinity and ensure normal growth of crops. After the brine is collected, it is passed into the raw water pool for storage, and the brine is purified and desalinated through the water purification system to produce concentrated water and clean water. The concentrated water is used to produce chemical raw materials through the salt production system. On the one hand, the clean water can be used in the planting area through the irrigation system. Crop or pasture irrigation, on the other hand, can be made into hydrogen and oxygen through the electrolysis system and stored. After the water for irrigating crops enters the soil, it is used for plant growth on the one hand, and on the other hand, it carries the salt in the soil into the saline-alkali land shaft drainage system, realizing continuous desalination in the planting area, essentially solving the saline-alkali land problem, using photovoltaic panels to supply energy, reducing dependence on traditional power grids, especially suitable for remote areas or areas with unstable power supply, realizing efficient utilization of renewable energy, greatly reducing energy consumption and operating costs in the purification process, making the entire system more economical and efficient, using solar energy as an energy source, without the use of fossil fuels, reducing carbon emissions, with significant environmental benefits, in line with the concept of green development. In addition, when the photovoltaic power generation is large and cannot be absorbed by users, this system can convert excess electricity into hydrogen and oxygen for storage, playing the role of energy storage. This system is suitable for saline-alkali land management, especially in saline-alkali land in areas with abundant light energy, areas with scarce water and soil resources or lack of energy, and has broad application prospects. The system not only effectively solves the problem of improving saline-alkali land to produce agricultural and animal husbandry products, but also can generate electricity and achieve efficient utilization of water and soil resources. At the same time, it promotes the development of renewable energy and is of great significance to the country's food security, energy security and water security. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] 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:

[0034] Figure 1 It is a schematic diagram of the structure of the present invention;

[0035] Among them, 1. Planting area; 2. Photovoltaic panel assembly; 3. Pipeline system; 4. Shaft drainage system; 5. Water pump system; 6. Raw water tank; 7. Flocculation sedimentation purifier; 8. Medium filter; 9. Filtered water supply tank; 10. High-pressure pump; 11. Reverse osmosis membrane assembly; 12. Water production reservoir; 13. Pumping system; 14. Concentrated water reservoir; 15. Cathode electrolytic cell; 16. Diaphragm; 17. Anode electrolytic cell; 18. Oxygen gas collection system; 19. Hydrogen collection system; 20. Treatment system; 21. Solar evaporation tank; 22. Salt drying system. DETAILED DESCRIPTION

[0036] 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.

[0037] 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.

[0038] Reference Figure 1 The present invention discloses a multi-purpose comprehensive irrigation and drainage system for saline-alkali land with complementary agriculture and light, comprising:

[0039] Planting area 1, used for growing crops or forage;

[0040] The saline-alkali land vertical shaft drainage system is set in the planting area 1 to drain excess groundwater, collect salt water, and maintain a lower groundwater level to inhibit salt backflow and ensure normal growth of crops;

[0041] The photovoltaic panel assembly 2 is arranged above the planting area 1 to reduce the evaporation and heat dissipation of crops or pastures, inhibit salt inversion, and provide electrical energy;

[0042] Raw water tank 6, for collecting salt water;

[0043] Water purification systems for brine purification and desalination to produce concentrated and clean water;

[0044] Salt production system, used to prepare chemical raw materials using concentrated water;

[0045] A water production reservoir 12 is used for storing purified water;

[0046] An irrigation system, connected to one of the water outlets of the water production reservoir 12, for irrigation of crops or pastures;

[0047] The electrolysis storage system is connected to the other water outlet of the water production reservoir 12 and is used to electrolyze clean water to generate hydrogen and oxygen and store them.

[0048] By planting crops in the planting area 1 and laying a saline-alkali land shaft drainage system, and scientifically arranging the photovoltaic panel assembly 2 above the planting area 1, evaporation is reduced and reverse salt is suppressed without affecting the normal growth of crops. The photovoltaic panel assembly 2 converts solar energy into electrical energy, which can provide electrical energy for the operation of the water purification system, the salt-making system, the irrigation system, and the electrolysis system. The saline-alkali land shaft drainage system discharges excess groundwater in the planting area 1, maintains a low groundwater level to suppress reverse salt, ensures the normal growth of crops, collects brine, and passes it into the raw water pool 6 for storage. The brine is purified and desalinated through the water purification system to produce concentrated water and clean water. The concentrated water is used to produce chemical raw materials, such as sodium sulfate, through the salt-making system. The clean water can be used in the planting area 1 through the irrigation system. Crop irrigation, on the other hand, can be made into hydrogen and oxygen through the electrolysis system and stored. After the water for irrigating crops enters the soil, it is used for plant growth on the one hand, and on the other hand, it carries the salt in the soil into the groundwater, and then is discharged by this system for collection and desalination and other steps in a cyclic operation to achieve continuous desalination in the planting area 1, and finally completely cure the saline-alkali land. The photovoltaic panel assembly 2 is used for energy supply, which reduces the dependence on the traditional power grid. It is particularly suitable for remote areas or areas with unstable power supply, realizes the efficient use of renewable energy, greatly reduces the energy consumption and operating costs in the purification process, and makes the operation of the entire system more economical and efficient. It uses solar energy as an energy source, does not need to use fossil fuels, reduces carbon emissions, has significant environmental benefits, and is in line with the concept of green development.

[0049] In addition, this system can be used in four situations: [1] When both irrigation and drainage are needed, when crops are short of water after a period of evapotranspiration, irrigation is needed, and at this time the groundwater level reaches a relatively high position and the groundwater depth is less than 2.6m, and drainage is needed. Enable this system to drain and irrigate at the same time. [2] When only irrigation is needed and drainage is not needed, when crops are short of water after a period of evapotranspiration, irrigation is needed, and at this time the groundwater level is at a relatively low position and the groundwater depth is greater than 2.6m, and drainage is not needed. Enable this system to pump water from the shaft and then irrigate only. [3] When only irrigation is not needed and drainage is needed, when crops are still not short of water after a period of evapotranspiration, irrigation is not needed, but at this time the groundwater level is at a relatively high position: the groundwater depth is less than 2.6m, and drainage is needed. Enable this system to drain and the discharged water is used to produce hydrogen energy storage. [4] When no irrigation or drainage is required but the photovoltaic power generation load cannot be absorbed, when the crop has not experienced water shortage after a period of evaporation, no irrigation is required, and the groundwater level is also at a relatively low position: the groundwater depth is greater than 2.6m, and no drainage is required, but the photovoltaic power generation cannot be absorbed by the electricity users at that time. This system is activated to pump water to produce hydrogen energy storage and produce industrial raw materials without irrigation. The raw water is reused through the purification process, which improves the utilization rate of water resources, reduces wastewater discharge, and maximizes the use of limited water resources. The water purification system removes salt from the water, significantly improves the water quality, and makes the purified water meet the needs of agricultural irrigation. This system is suitable for saline-alkali land management, especially in saline-alkali land in areas with abundant light energy, areas with scarce water and soil resources or energy, and has broad application prospects. The system not only effectively solves the problem of improving saline-alkali land to produce agricultural and animal husbandry products, but also can generate electricity, realize the efficient use of water and soil resources, and promote the development of renewable energy. It is of great significance to the country's food security, energy security, and water security.

[0050] To further optimize the solution, the vertical shaft drainage system for saline-alkali land includes:

[0051] A vertical shaft drainage system 4 is arranged in the planting area 1. The vertical shaft drainage system 4 is used to drain the excessive groundwater in the planting area 1, collect salt water, and maintain a lower groundwater level to inhibit salt backflow and ensure normal growth of crops;

[0052] The pipeline system 3, the water inlet end of the pipeline system 3 is connected to the shaft drainage system 4, and the water outlet end of the pipeline system 3 is connected to the water inlet end of the raw water tank 6 through the water pump system 5, which is used to transport the brine collected by the shaft drainage system 4 to the raw water tank 6.

[0053] The photovoltaic panel assembly 2 is composed of a plurality of photovoltaic panels. The photovoltaic panels are scientifically and reasonably arranged on saline-alkali land to ensure that the growth of crops is not affected and normal production is guaranteed. It can also reduce field evaporation and inhibit reverse salting, and finally provide clean energy for water purification systems and salt production systems.

[0054] Photovoltaic panels should be designed with an elevated structure and be erected at a height of 2-3 meters, so that crops can be planted under the photovoltaic panels. The height of the support depends on the growth height of the crops. If the crops are shorter, the height of the support can be appropriately lowered, but it is necessary to ensure that the growth of the crops is not affected by shading.

[0055] The tilt angle of the photovoltaic panel is set according to the local latitude, and is generally around 20-30 degrees. The spacing between panels should ensure that the crops can get enough sunlight while reducing shadow overlap. The recommended spacing is 1.5 to 2 times the height of the photovoltaic panel, which can ensure that the crops receive light at different times of the day.

[0056] At the same time, a north-south vertical arrangement or a staggered arrangement is adopted, so that the shadows of the photovoltaic panels can alternately provide shade in the morning and evening, ensuring that crops in different time periods can obtain light.

[0057] At the same time, choosing photovoltaic panels with a certain degree of light transmittance can ensure that the crops underneath can still obtain some sunlight, which is helpful for the growth of crops, especially for some salt-alkali tolerant crops that require less light.

[0058] Divide the planting area 1 into several small zones, and select different crops in each zone according to the shading conditions of the photovoltaic panels. Shade-tolerant crops or salt-tolerant crops with low light requirements, such as quinoa and alfalfa, can be planted in the shaded areas close to the photovoltaic panels. Crops with higher light requirements, such as corn, can be planted in the sunny areas farther away.

[0059] At the same time, a combination of high and low crops and compound planting patterns can be used.

[0060] For example, the combination of high and low crops: in the shaded area below the photovoltaic panels, you can consider planting low crops, such as forage grass, legumes, etc. The gaps between the photovoltaic panels can be planted with taller crops, such as salt-tolerant trees (such as Tamarix) or tall crops (such as corn).

[0061] Composite planting mode: Adopting composite planting mode, combined with multiple crop rotation or intercropping, can improve land utilization and improve soil salinity. Composite planting can increase crop diversity and reduce excessive consumption of soil nutrients by a single crop.

[0062] The shaft drainage system 4 includes a plurality of shafts dug in the planting area 1. In saline-alkali land, the groundwater level is generally controlled below 2.6 meters to prevent the groundwater from bringing salt to the surface through capillary action. The depth of the shaft is usually between 5 and 10 meters, and the specific depth is determined according to the local groundwater level. The bottom of the shaft needs to be below the groundwater level to effectively collect groundwater.

[0063] For groundwater at different depths, different depths of shaft drainage systems can be used. For example, shallow groundwater can be drained through a shallow shaft system, while deep groundwater requires deeper shafts for drainage.

[0064] The spacing between shafts depends on the permeability of the soil and the flow rate of groundwater. For clay-alkali soils with poor permeability, the distance between shafts should be relatively close, usually around 100-200 meters; for sandy soils with good permeability, the spacing can be appropriately increased, usually 200-500 meters.

[0065] The well group arrangement can adopt a grid layout, with vertical wells evenly distributed in the planting area 1; or the drainage well group can be arranged along the low-lying areas in the field or the groundwater collection area to lower the groundwater level in the area through centralized drainage.

[0066] Vertical shafts usually use prefabricated concrete pipes, PVC pipes or steel pipes. In order to prevent the shaft wall from collapsing, the shaft wall needs to be reinforced and water filter holes are set on the shaft wall. The hole diameter of the water filter hole should be designed according to the soil particle size to avoid soil blocking the pores and affecting drainage. The bottom of the well and around the well wall can be filled with permeable sand and gravel filter materials, which can increase the drainage capacity of the shaft and prevent sediment from blocking the wellhead.

[0067] The brine in the shaft drainage system 4 is pumped through the water pump system 5 and the pipeline system 3 and stored in the raw water tank 6 .

[0068] According to a further optimization scheme, the water purification system includes a flocculation sedimentation purifier 7, a medium filter 8, a filtered water supply tank 9, a high-pressure pump 10 and a reverse osmosis membrane assembly 11 which are connected in sequence. The clean water outlet of the reverse osmosis membrane assembly 11 is connected to the water production reservoir 12, and the concentrated water outlet of the reverse osmosis membrane assembly 11 is connected to the water inlet of the salt production system.

[0069] The water in the raw water tank 6 passes through the flocculation sedimentation purifier 7, and the suspended matter and other tiny particles in the water are aggregated into larger flocs by adding flocculants, so that they can be separated from the water through the sedimentation process.

[0070] After passing through the flocculation sedimentation purifier 7, the water passes through the medium filter 8, and the suspended matter, silt and other impurities in the water are further removed by utilizing the physical interception effect of the medium.

[0071] The filtered water supply tank 9 is used to store pre-treated water after passing through the flocculation sedimentation purifier 7 and the media filter 8. The pre-treated water is pushed through the reverse osmosis membrane assembly 11 by the high-pressure pump 10, so that water molecules can pass through the membrane, while salt and other impurities are retained.

[0072] The reverse osmosis membrane assembly 11 performs desalination through the selective permeation principle of a semipermeable membrane, and can effectively intercept dissolved salts, heavy metals, organic matter and other pollutants while allowing water molecules to pass through.

[0073] The purified and desalinated water is stored in the water production reservoir 12 .

[0074] A further optimized solution is provided, in which the salt production system includes a concentrate water reservoir 14 connected to the concentrate water outlet end of the reverse osmosis membrane assembly 11; the concentrate water reservoir 14 is connected to a solar evaporation tank 21 at the outlet end thereof; the solar evaporation tank 21 is used to increase the salt concentration in the concentrate; the solar evaporation tank 21 is connected to a salt drying system 22; the salt drying system 22 is electrically connected to the photovoltaic panel assembly 2; the salt drying system 22 is used to heat and evaporate the water in the high-concentration concentrate produced by the solar evaporation tank 21 to obtain sodium sulfate.

[0075] The concentrated water produced by the reverse osmosis membrane assembly 11 enters the concentrated water reservoir 14, and the concentrated water in the concentrated water reservoir 14 is passed into the solar evaporation pool 21. The wastewater is initially evaporated and concentrated by the solar evaporation pool 21 to reduce the water content and increase the salt concentration in the wastewater, so that the saltpeter can be extracted more efficiently in the oven. The high-concentration salt water enters the salt drying system 22, and the clean energy generated by the photovoltaic panels is used to drive the oven of the salt drying system 22. The water in the wastewater is evaporated by heating, and the sodium sulfate (saltpeter) therein is concentrated and precipitated. Through electric heating, temperature control system, and automated collection device, efficient separation of salts can be achieved, and energy utilization can be maximized.

[0076] According to a further optimization scheme, the electrolytic storage system includes an electrolytic cell, the water inlet of the electrolytic cell is connected to one of the water outlets of the water production reservoir 12, and a diaphragm 16 is fixedly connected to the middle of the electrolytic cell for separating the electrolytic cell into a cathode electrolytic cell 15 and an anode electrolytic cell 17;

[0077] A cathode is provided in the cathode electrolytic cell 15, and the cathode electrolytic cell 15 is used for water electrolysis to generate hydrogen;

[0078] An anode is provided in the anode electrolysis cell 17, and the anode electrolysis cell 17 is used for electrolyzing water to produce oxygen;

[0079] The cathode electrolytic cell 15 is connected to a hydrogen collecting system 19, which is used to collect hydrogen. The anode electrolytic cell 17 is connected to an oxygen gas collecting system 18, which is used to collect oxygen.

[0080] The gas outlet ends of the oxygen gas collection system 18 and the hydrogen gas collection system 19 are connected to the gas inlet end of the processing system 20. The processing system 20 includes an oxygen processing device and a hydrogen purification device. The oxygen processing device is connected to the gas outlet end of the oxygen gas collection system 18 for oxygen collection, and the hydrogen purification device is connected to the gas outlet end of the hydrogen gas collection system 19 for hydrogen purification and collection.

[0081] The cathode electrolytic cell 15 converts water molecules into hydrogen through a reduction reaction, while consuming electrons to generate hydrogen, which is then transported to the hydrogen collection system 19 through a pipeline.

[0082] The diaphragm 16 is used to separate the anode and cathode regions, prevent the mixing of oxygen and oxygen, ensure the safe and stable operation of the electrolysis process, and maintain the balance of ion conduction.

[0083] The anode electrolysis cell 17 uses an oxidation reaction to decompose water molecules into oxygen (O 2 ) and hydrogen ions (H + ). Oxygen is produced as a product on the anode side and is transported to the oxygen gas collection system 18 through a pipeline.

[0084] The processing system 20 includes an oxygen processing device and a hydrogen purification device. Hydrogen and oxygen can be purified and then stored or used.

[0085] According to a further optimization scheme, the water inlet of the irrigation system is connected to the water outlet of the pumping system 13 , and the water inlet of the pumping system 13 is connected to the water outlet of the water production reservoir 12 .

[0086] The pumping system 13 can extract water from the water production reservoir 12 safely and efficiently and transport it to the area that needs irrigation.

[0087] According to a further optimization scheme, the height of the photovoltaic panels of the photovoltaic panel assembly 2 is 2-3 meters.

[0088] According to a further optimization scheme, the photovoltaic panel of the photovoltaic panel assembly 2 has an inclination angle of 20-30 degrees.

[0089] According to a further optimization scheme, the distance between two adjacent photovoltaic panels of the photovoltaic panel assembly 2 is 1.5-2 times of the height of the photovoltaic panels.

[0090] 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.

[0091] 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 multi-purpose comprehensive irrigation and drainage system for saline-alkali land with agricultural and photovoltaic complementarity, characterized in that: include: Planting area (1), used for growing crops or pasture; A saline-alkali land vertical well drainage system is arranged in the planting area (1) to drain excess groundwater, collect salt water, and maintain a lower groundwater level to inhibit salt backflow and ensure normal growth of crops; A photovoltaic power generation panel assembly (2) is arranged above the planting area (1) and is used to reduce evaporative heat dissipation of crops or pastures, inhibit salt inversion, and provide electrical energy; A raw water tank (6) for collecting salt water; Water purification systems for brine purification and desalination to produce concentrated and clean water; Salt production system, used to prepare chemical raw materials using concentrated water; A water production reservoir (12) for storing purified water; An irrigation system, connected to one of the water outlets of the water production reservoir (12), for irrigation of crops or pastures; The electrolysis storage system is connected to the other water outlet end of the water production reservoir (12) and is used for electrolyzing clean water to generate hydrogen and oxygen and store them.

2. The multi-purpose comprehensive irrigation and drainage system for saline-alkali land with agricultural and photovoltaic complementarity according to claim 1 is characterized in that: The saline-alkali land vertical shaft drainage system comprises: A vertical shaft drainage system (4), the vertical shaft drainage system (4) being arranged in the planting area (1), the vertical shaft drainage system (4) being used to drain excess groundwater in the planting area (1), collect salt water, and maintain a lower groundwater level to inhibit salt backflow, thereby ensuring normal growth of crops; A pipe system (3), wherein the water inlet of the pipe system (3) is connected to the vertical shaft drainage system (4), and the water outlet of the pipe system (3) is connected to the water inlet of the raw water pool (6) through a water pump system (5), so as to transport the salt water collected by the vertical shaft drainage system (4) to the raw water pool (6).

3. The multi-purpose comprehensive irrigation and drainage system for saline-alkali land with agricultural and photovoltaic complementarity according to claim 1 is characterized in that: The water purification system comprises a flocculation sedimentation purifier (7), a medium filter (8), a filtered water supply tank (9), a high-pressure pump (10) and a reverse osmosis membrane assembly (11) which are sequentially connected and arranged, wherein the purified water outlet of the reverse osmosis membrane assembly (11) is connected to the produced water reservoir (12), and the concentrated water outlet of the reverse osmosis membrane assembly (11) is connected to the water inlet of the salt production system.

4. The multi-purpose comprehensive irrigation and drainage system for saline-alkali land with agricultural and photovoltaic complementation according to claim 3 is characterized by: The salt production system comprises a concentrated water reservoir (14) connected to the concentrated water outlet end of the reverse osmosis membrane assembly (11); the outlet end of the concentrated water reservoir (14) is connected to a solar evaporation pool (21); the solar evaporation pool (21) is used to increase the salt concentration in the concentrated water; the solar evaporation pool (21) is connected to a salt drying system (22); the salt drying system (22) is electrically connected to the photovoltaic panel assembly (2); the salt drying system (22) is used to heat and evaporate the water in the high-concentration concentrated water produced by the solar evaporation pool (21) to obtain sodium sulfate.

5. The multi-purpose comprehensive irrigation and drainage system for saline-alkali land with agricultural and photovoltaic complementarity according to claim 1 is characterized by: The electrolytic storage system comprises an electrolytic cell, the water inlet of the electrolytic cell is connected to one of the water outlets of the water production reservoir (12), and a diaphragm (16) is fixedly connected to the middle of the electrolytic cell for separating the electrolytic cell into a cathode electrolytic cell (15) and an anode electrolytic cell (17); The cathode electrolytic cell (15) is provided with a cathode, and the cathode electrolytic cell (15) is used for electrolyzing water to generate hydrogen; The anode electrolysis cell (17) is provided with an anode, and the anode electrolysis cell (17) is used for electrolyzing water to produce oxygen; The cathode electrolytic cell (15) is connected to a hydrogen collection system (19), and the hydrogen collection system (19) is used to collect hydrogen. The anode electrolytic cell (17) is connected to an oxygen gas collection system (18), and the oxygen gas collection system (18) is used to collect oxygen. The gas outlet ends of the oxygen gas collection system (18) and the hydrogen gas collection system (19) are connected to the gas inlet end of the processing system (20). The processing system (20) comprises an oxygen processing device and a hydrogen purification device. The oxygen processing device is connected to the gas outlet end of the oxygen gas collection system (18) for oxygen collection. The hydrogen purification device is connected to the gas outlet end of the hydrogen gas collection system (19) for hydrogen purification and collection.

6. The multi-purpose comprehensive irrigation and drainage system for saline-alkali land with agricultural and photovoltaic complementarity according to claim 1 is characterized by: The water inlet of the irrigation system is connected to the water outlet of the pumping system (13), and the water inlet of the pumping system (13) is connected to the water outlet of the water production reservoir (12).

7. The multi-purpose comprehensive irrigation and drainage system for saline-alkali land with agricultural and photovoltaic complementation according to claim 1 is characterized by: The photovoltaic panel of the photovoltaic power generation panel assembly (2) has a height of 2-3 meters.

8. The multi-purpose comprehensive irrigation and drainage system for saline-alkali land with agricultural and photovoltaic complementation according to claim 1 is characterized by: The photovoltaic panel of the photovoltaic power generation panel assembly (2) has an inclination angle of 20-30 degrees.

9. The multi-purpose comprehensive irrigation and drainage system for saline-alkali land with agricultural and photovoltaic complementation according to claim 4 is characterized by: The distance between two adjacent photovoltaic panels of the photovoltaic power generation panel assembly (2) is 1.5 to 2 times the height of the photovoltaic panels.

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