Brackish water sub-desalination continuous water production mixed irrigation device and irrigation method

Abstract

The present invention proposes a brackish water sub-desalination continuous water production mixed irrigation device and irrigation method, the device includes a power supply and storage component, a monitoring and parameter setting component, a pretreatment component, a first capacitor deionization device, a second capacitor deionization device, a first sub-desalination water tank, a second sub-desalination water tank, a brine tank, a fresh water tank, a mixing water tank and an irrigation water tank. The present invention can switch between the salt absorption mode and the salt discharge mode by setting the first capacitor deionization device and the second capacitor deionization device, and can achieve continuous water production irrigation, reduce the time required for system shutdown, maintenance and restart, not only has obvious advantages in water supply stability, energy efficiency and water quality flexibility, but also is particularly suitable for application scenarios such as agricultural irrigation that have high requirements for water resource sustainability, so as to make efficient use of water resources. The capacitor deionization technology used in the present invention has the advantages of low energy consumption, easy installation, low pollution and sustainable utilization.

Description

Technical Field

[0001] The present invention relates to the field of irrigation technology, and in particular to a brackish water sub-salinity continuous water production mixing irrigation device and an irrigation method based on capacitive deionization technology. Background Art

[0002] Brackish water generally refers to salt water with a mineralization of 2 to 5 g / L. It is an unconventional water resource that is not often used. The Northwest region has an arid climate and scarce precipitation. It has long faced the problem of scarce freshwater resources. Since natural precipitation cannot meet the needs of crop growth, large-scale agricultural production must rely on irrigation. In order to meet the demand for agricultural water, groundwater and surface water resources are widely used in the arid areas of the Northwest. China has a large amount of brackish water resources that can be exploited, of which the total amount of brackish water resources in the arid areas of the Northwest is about 159.7263 billion m 3 The arid northwest region is an important grain producing area in my country. Many salt-tolerant crops (such as cotton and sugar beet) can adapt to irrigation with a certain concentration of brackish water. More and more agricultural production relies on secondary water sources such as widely distributed bitter and salty water resources. Therefore, using appropriate technology and equipment to desalinate or desalinate abundant salt or brackish water resources and using the desalinated or desalinated water for irrigation of salt-tolerant crops can alleviate the problem of water shortage in my country to a certain extent, protect my country's food security, and promote the sustainable development of my country's agriculture.

[0003] Capacitive deionization technology (CDI) has significant advantages and good application prospects in the field of agricultural saline water sub-desalination irrigation due to its low energy consumption, almost zero secondary pollution, economic and environmental advantages. Traditional capacitive deionization technology uses double layer or Faraday theory to cyclically adsorb and desorb saline water, thereby achieving the purpose of saline water desalination and CDI component salt removal and reuse. However, since the same group of CDI components use intermittent operation mode for adsorption and desorption, this means that traditional CDI equipment cannot produce water continuously, thus affecting the desalination efficiency and water supply stability of the entire CDI system. The desalination rate of CDI, that is, the speed of producing desalinated water, is limited. It is difficult to obtain water quality that can be directly used for crop irrigation by desalination using traditional CDI systems, and the existing CDI systems cannot achieve real-time water quality adjustment. The irrigation water after desalination often cannot meet the irrigation water quality requirements of typical salt-tolerant crops. Therefore, traditional CDI sub-desalination equipment cannot adapt to the demand for large-scale agricultural water and cannot achieve the maximum irrigation benefits. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems in the related art to a certain extent. To this end, the embodiment of the present invention provides a brackish water sub-salinity continuous water production mixed irrigation device and irrigation method based on capacitive deionization technology, which can realize continuous water production irrigation, make efficient use of water resources, and save water resources.

[0005] In one aspect, an embodiment of the present invention provides a brackish water sub-desalination continuous water production and mixing irrigation device based on capacitive deionization technology, comprising: a pretreatment component, a first capacitive deionization device, a second capacitive deionization device and a mixing water tank.

[0006] The pretreatment component includes a primary filtering device and a pretreatment water tank. The pretreatment water tank has a liquid inlet and a liquid outlet. The liquid inlet of the pretreatment water tank is connected to the primary filtering device to store the brackish water after primary filtering.

[0007] The first capacitor deionization device has a liquid inlet and a liquid outlet, the liquid inlet of the first capacitor deionization device is connected to the liquid outlet of the pretreatment water tank, the liquid outlet of the first capacitor deionization device is respectively connected to the first sub-desalination water tank and the brine tank, the second capacitor deionization device has the same structure as the first capacitor deionization device and can be switched between a salt absorption mode and a salt discharge mode, the liquid inlet of the second capacitor deionization device is connected to the liquid outlet of the pretreatment water tank, the liquid outlet of the second capacitor deionization device is respectively connected to the second sub-desalination water tank and the brine tank, and the first capacitor deionization device and the second capacitor deionization device are connected in parallel.

[0008] The mixing water tank has a first liquid inlet, a second liquid inlet and a liquid outlet. An agitator is arranged in the mixing water tank. The first liquid inlet of the mixing water tank is respectively connected to the liquid outlet of the first sub-desalination water tank and the liquid outlet of the second sub-desalination water tank. The second liquid inlet of the mixing water tank is connected to the fresh water tank. The liquid outlet of the mixing water tank is connected to the irrigation water tank. The liquid outlet of the irrigation water tank is connected to the irrigation water pipe, which leads to the irrigation area.

[0009] In some embodiments, the first capacitive deionization device includes a first support plate, a first silicone gasket, a deionization module, a second silicone gasket and a second support plate connected in sequence, the deionization module includes an electrode sheet and a silicone frame, the electrode sheet and the silicone frame are respectively provided with a plurality of and spaced apart connection, the electrical properties of two adjacent electrode sheets are opposite, the first support plate, the first silicone gasket, the electrode sheet, the silicone frame, the second silicone gasket and the second support plate are respectively provided with liquid holes, and the liquid holes are connected with the liquid inlet and the liquid outlet of the first capacitive deionization device.

[0010] In some embodiments, the liquid holes of two adjacent electrode sheets are staggered to form a baffle structure.

[0011] In some embodiments, the first support plate and the second support plate are both made of acrylic material, the electrode sheet is a titanium plate coated with electrode material, and the electrode material is a composite material of activated carbon, polyvinylidene fluoride and conductive carbon black.

[0012] In some embodiments, the pretreatment component also includes a sedimentation tank having a liquid inlet and a liquid outlet. The liquid inlet of the sedimentation tank is connected to a water pump to extract brackish water, and the liquid outlet of the sedimentation tank is connected to the liquid inlet of the primary filtration device to transport the precipitated brackish water to the primary filtration device.

[0013] In some embodiments, the primary filtration device includes a screen filter and a granular activated carbon filter, and the granular activated carbon filter is connected between the screen filter and the pre-treatment water tank.

[0014] In some embodiments, the irrigation device also includes a power supply and storage component, which includes a lithium titanate battery and a controller. The lithium titanate battery is connected to an external power source and electrical equipment to store and provide electrical energy, and the controller connects the lithium titanate battery and the electrical equipment.

[0015] In some embodiments, multiple groups of lithium titanate batteries are connected in parallel to perform charging and discharging in turn.

[0016] In some embodiments, the sedimentation tank, pretreatment water tank, first sub-desalination water tank, second sub-desalination water tank, mixing water tank, fresh water tank and irrigation water tank are respectively provided with float level gauges, and the sedimentation tank, pretreatment water tank, first sub-desalination water tank, second sub-desalination water tank, mixing water tank and fresh water tank are respectively provided with salt concentration measuring instruments, and the float level gauge and the salt concentration measuring instrument are respectively electrically connected to the computer system.

[0017] Another embodiment of the present invention provides a method for mixed irrigation of brackish water sub-salinity based on capacitive deionization technology, using the brackish water sub-salinity based on capacitive deionization technology continuous water production device, comprising the following steps:

[0018] The required salt concentration and water consumption of irrigation water are determined based on crop information and input into the computer system. The computer system analyzes and sets the liquid level and salt concentration requirements of each device. After the setting is completed, the sedimentation tank transports the brackish water to the primary filtration device for primary filtration. The brackish water after primary filtration enters the pretreatment water tank.

[0019] After the water in the pretreatment water tank reaches the set water level, the first capacitor deionization device is set to the salt absorption mode, and the second capacitor deionization device is set to the salt discharge mode. The water in the pretreatment water tank enters the first capacitor deionization device and the second capacitor deionization device respectively. The concentrated brine treated by the second capacitor deionization device flows into the brine tank, and the sub-salted water treated by the first capacitor deionization device flows into the first sub-salted water tank.

[0020] After the water level of the first sub-desalinated water tank reaches the set value, it is detected whether the salt concentration of the sub-desalinated water in the first sub-desalinated water tank reaches the set value. When the salt concentration does not reach the set value, the sub-desalinated water in the first sub-desalinated water tank flows back to the pretreatment water tank and is desalinated again through the first capacitive deionization device; when the salt concentration of the sub-desalinated water in the first sub-desalinated water tank reaches the set value, the sub-desalinated water flows into the mixing water tank.

[0021] The fresh water tank inputs fresh water into the blending tank according to the set value to mix with the desalinated water, so that the salt concentration of the desalinated water in the blending tank reaches the set value, and then the desalinated water is transported to the irrigation tank for irrigation.

[0022] When it is detected that the salt concentration at the end of the first capacitor deionization device no longer changes, the first capacitor deionization device is switched to the salt discharge mode, and the second capacitor deionization device is switched to the salt absorption mode. The concentrated brine treated by the first capacitor deionization device flows into the brine tank, and the sub-salted water treated by the second capacitor deionization device flows into the second sub-salted water tank.

[0023] After the water level of the second sub-desalinated water tank reaches the set value, it is detected whether the salt concentration of the sub-desalinated water in the second sub-desalinated water tank reaches the set value. When the salt concentration does not reach the set value, the sub-desalinated water in the second sub-desalinated water tank flows back to the pretreatment water tank and is desalinated again through the second capacitive deionization device; when the salt concentration of the sub-desalinated water in the second sub-desalinated water tank reaches the set value, the sub-desalinated water flows into the mixing water tank.

[0024] The fresh water tank inputs fresh water into the blending water tank according to the set value and mixes it with the sub-desalinated water, so that the salt concentration of the sub-desalinated water in the blending water tank reaches the set value, and then the sub-desalinated water is transported to the irrigation water tank for irrigation. When it is detected that the salt concentration at the end of the second capacitive deionization device no longer changes, the second capacitive deionization device is switched to the salt discharge mode, the first capacitive deionization device is switched to the salt absorption mode, and the above steps are repeated. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings.

[0026] in:

[0027] Figure 1 It is a schematic diagram of the structure of a brackish water sub-desalination continuous water production and mixing irrigation device based on capacitive deionization technology in an embodiment of the present invention;

[0028] Figure 2 for Figure 1 A schematic structural diagram of the first capacitor deionization device;

[0029] Figure 3It is a flow chart of a method for continuous water production and mixed irrigation of brackish water sub-desalination based on capacitive deionization technology in an embodiment of the present invention;

[0030] Reference numerals:

[0031] 1. Sedimentation tank; 2. Primary filtration device; 3. Pretreatment water tank; 4. First capacitor deionization device; 5. Second capacitor deionization device; 6. First sub-desalination water tank; 7. Second sub-desalination water tank; 8. Brine tank; 9. Fresh water tank; 10. Mixing water tank; 11. Irrigation water tank;

[0032] 41. First support plate; 42. First silicone gasket; 43. Electrode sheet; 44. Silicone frame; 45. Second silicone gasket; 46. Second support plate. DETAILED DESCRIPTION

[0033] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0034] The following describes a brackish water sub-desalination continuous water production mixed irrigation device and irrigation method based on capacitive deionization technology according to an embodiment of the present invention with reference to the accompanying drawings.

[0035] like Figure 1 As shown, an embodiment of the present invention proposes a brackish water sub-desalination continuous water production mixing irrigation device based on capacitive deionization technology, including: a pretreatment component, a first capacitive deionization device 4, a second capacitive deionization device 5 and a mixing water tank 10.

[0036] The pretreatment component includes a primary filter device 2 and a pretreatment water tank 3. The pretreatment water tank 3 has a liquid inlet and a liquid outlet. The liquid inlet of the pretreatment water tank 3 is connected to the primary filter device 2 to store the brackish water after primary filtration.

[0037] The first capacitor deionization device 4 has a liquid inlet and a liquid outlet, the liquid inlet of the first capacitor deionization device 4 is connected to the liquid outlet of the pretreatment water tank 3, the liquid outlet of the first capacitor deionization device 4 is respectively connected to the first sub-desalination water tank 6 and the brine tank 8, the second capacitor deionization device 5 has the same structure as the first capacitor deionization device 4 and can be switched between the salt absorption mode and the salt discharge mode, the liquid inlet of the second capacitor deionization device 5 is connected to the liquid outlet of the pretreatment water tank 3, the liquid outlet of the second capacitor deionization device 5 is respectively connected to the second sub-desalination water tank 7 and the brine tank 8, and the first capacitor deionization device 4 and the second capacitor deionization device 5 are connected in parallel.

[0038] The mixing water tank 10 has a first liquid inlet, a second liquid inlet and a liquid outlet. A stirrer is provided in the mixing water tank 10 for stirring the mixed brackish water in the mixing water tank 10. The first liquid inlet of the mixing water tank 10 is connected to the liquid outlet of the first sub-desalinated water tank 6 and the liquid outlet of the second sub-desalinated water tank 7, respectively. The second liquid inlet of the mixing water tank 10 is connected to the fresh water tank 9. The liquid outlet of the mixing water tank 10 is connected to the irrigation water tank 11. The liquid outlet of the irrigation water tank 11 is connected to the irrigation water pipe, which leads to the irrigation area.

[0039] The embodiment of the present invention can alternately switch between the salt absorption mode and the salt discharge mode by setting the first capacitor deionization device 4 and the second capacitor deionization device 5 in parallel, thereby realizing continuous water production for irrigation and reducing the time required for system shutdown, maintenance and restart. It not only has obvious advantages in water supply stability, energy efficiency and water quality flexibility, but is also particularly suitable for application scenarios such as agricultural irrigation that have high requirements for water resource sustainability, thereby making efficient use of water resources.

[0040] The capacitive deionization technology used in the embodiment of the present invention has the advantages of low energy consumption, easy installation, low pollution and sustainable utilization. The sub-salinated irrigation water can meet the irrigation needs of salt-tolerant crops in the arid areas of Northwest China, making full use of the regional characteristics of rich bitter and salty water resources in the arid areas of Northwest China and the large water demand for crop irrigation, promoting stable and sustainable agricultural irrigation in the arid areas, providing targeted and adjustable brackish water irrigation for different salt-tolerant crops in the arid areas of Northwest China, and saving water resources.

[0041] It should be noted that the first capacitive deionization device 4 and the second capacitive deionization device 5 are connected to a DC power supply, the DC power supply is connected to a battery, and a controller is connected to the DC power supply and the battery. The DC power supply provides electrical energy for the entire irrigation device and charges the battery. The battery is used to store electrical energy for backup, and the controller is used to control the working state of the DC power supply and the battery.

[0042] The DC power supply provides voltage for the first capacitor deionization device 4 and the second capacitor deionization device 5. After the capacitor deionization device is powered on, it adsorbs salt ions in the water according to the double electric layer principle, thereby achieving the purpose of sub-desalination of brackish water. The sub-desalination water tank is used to store water treated by the capacitor deionization device.

[0043] like Figure 2As shown, in some embodiments, the first capacitive deionization device 4 includes a first support plate 41, a first silicone gasket 42, a deionization module, a second silicone gasket 45 and a second support plate 46 connected in sequence, the deionization module includes an electrode sheet 43 and a silicone frame 44, the electrode sheet 43 and the silicone frame 44 are respectively provided with a plurality of and spaced apart connection, the electrical properties of two adjacent electrode sheets 43 are opposite, the first support plate 41, the first silicone gasket 42, the electrode sheet 43, the silicone frame 44, the second silicone gasket 45 and the second support plate 46 are respectively provided with liquid holes, and the liquid holes are connected to the liquid inlet and the liquid outlet of the first capacitive deionization device 4.

[0044] A silicone frame 44 is provided between two adjacent electrode sheets 43 to separate adjacent electrode sheets 43 and prevent the capacitor deionization device from short-circuiting. The silicone frame 44 is made of silicone, and has an external dimension of 250×250×2mm, and an internal empty area dimension of 220×220×2mm. The first silicone gasket 42 and the second silicone gasket 45 are made of silicone, and have a dimension of 250×250×2mm. They are respectively provided on the inner side of the first support plate 41 and the second support plate 46. The position and size of the liquid hole of the silicone gasket are the same as those of the liquid hole of the support plate. The silicone gasket is used to separate the support plate and the electrode sheet 43 to prevent the metal electrode sheet 43 from wearing the support plate.

[0045] like Figure 2 As shown, in some embodiments, the liquid holes of two adjacent electrode sheets 43 are staggered to form a baffle structure, which can extend the water flow path and the adsorption time of salt ions in brackish water, thereby ensuring that the brackish water is fully desalinated.

[0046] Furthermore, liquid holes with a diameter of 20 mm are respectively provided at the lower left and upper right of two adjacent electrode sheets 43 .

[0047] In some embodiments, the first support plate 41 and the second support plate 46 are both made of acrylic material, the electrode sheet 43 is a titanium plate coated with an electrode material, and the electrode material is a composite material of activated carbon, polyvinylidene fluoride and conductive carbon black.

[0048] Furthermore, the electrode sheet 43 is composed of an upper lug area and a lower coating area, and is made of titanium. The lug area has a size of 50×80×0.5 mm (length×height×thickness), and the coating area has a size of 250×250×0.5 mm. The first support plate 41 and the second support plate 46 both have a size of 250×250×30 mm.

[0049] Furthermore, the coating area of ​​the electrode sheet 43 is coated with an electrode material, and the electrode material is a mixture of activated carbon, conductive carbon black, and polyvinylidene fluoride. The production process is as follows: polyvinylidene fluoride is dissolved in N-2 methylpyrrolidone solution to prepare a 2.25% N-2 methylpyrrolidone solution of polyvinylidene fluoride, and then the activated carbon, conductive carbon black, and N-2 methylpyrrolidone solution of polyvinylidene fluoride are mixed in a ratio of 8:1:1 to the mass ratio of activated carbon, conductive carbon black, and polyvinylidene fluoride, and the electrode material slurry is prepared by fully stirring for 8 hours. The electrode sheet 43 without material coating is stably installed on the coating machine, and the coating thickness of the coating machine is set to 200μm and the coating speed is set to 5mm / s. The electrode material is coated on the coating area of ​​the electrode sheet 43, and then the coated electrode sheet 43 is dried for 1 hour and then placed in a vacuum oven at 80°C for 12 hours to finally prepare the electrode sheet 43 in the capacitor deionization device.

[0050] like Figure 1 As shown, in some embodiments, the pretreatment component also includes a sedimentation tank 1, which has a liquid inlet and a liquid outlet. The liquid inlet of the sedimentation tank 1 is connected to a water pump to extract brackish water, and the liquid outlet of the sedimentation tank 1 is connected to the liquid inlet of the primary filtration device 2 to transport the precipitated brackish water to the primary filtration device 2.

[0051] Furthermore, the sedimentation tank 1 is a vertical flow sedimentation tank. The vertical flow sedimentation tank uses the principle of gravity sedimentation. Brackish water flows into the sedimentation tank from the bottom of the sedimentation tank. The suspended matter in the water gradually sinks to the bottom of the tank under the action of gravity, and the precipitated particles accumulate at the bottom of the sedimentation tank. The mud is discharged regularly through the mud discharge equipment at the bottom of the vertical flow sedimentation tank, and the upper layer of water flows into the primary filter device 2 through the connecting pipe.

[0052] In some embodiments, the primary filtration device 2 includes a screen filter and a granular activated carbon filter, and the granular activated carbon filter is connected between the screen filter and the pre-treatment water tank 3. The screen filter and the granular activated carbon filter are used in combination to remove smaller particles in the water, and the treated water flows into the pre-treatment water tank 3 through the connecting pipe.

[0053] In some embodiments, the irrigation device also includes a power supply and storage component, which includes a lithium titanate battery and a controller. The lithium titanate battery connects an external power source and electrical equipment in the irrigation device to store and provide electrical energy, and the controller connects the lithium titanate battery and the electrical equipment.

[0054] The battery uses lithium titanate battery, which supports fast charging and discharging, and has a very long cycle life, which can reach tens of thousands of charge and discharge cycles. The battery is charged in a constant current and constant voltage charging mode. The controller is connected to the battery to control the working state, charge and discharge state of the battery, and the current and voltage output to the device.

[0055] The working process of the power supply and storage component is as follows: first, use the computer system to check whether the health status and power status of each battery are normal. The computer system inputs the voltage value required by the battery based on the analysis results of the voltage required for CDI desalination of irrigation water with different salt concentrations by the loading intelligent system. The working mode of the battery is constant voltage mode, and the healthy and fully charged batteries are regulated to discharge, and the remaining healthy batteries are charged; when it is detected that the power of the battery in discharge operation is less than 5%, the charging battery is changed to the discharge working state, and the discharging battery is changed to the charging state. In this way, the batteries work in a cycle to continuously provide the required voltage for the device.

[0056] Furthermore, the constant voltage range of the battery output is 0.8-2V, and the output current range is 0-20A. The lower DC voltage saves energy and does not cause water electrolysis. The controller is equipped with a programmable logic controller and is connected to all electrical devices on the device. It can control the power supply status and operating mode of all electrical devices.

[0057] Furthermore, the irrigation device of the embodiment of the present invention also includes a monitoring and parameter setting component, which includes a computer system and a device parameter control system mounted thereon. The computer system is connected to the controller. The computer system controls the power supply and operation status of the entire irrigation device in real time and quickly by connecting to the controller. After the device parameter control system in the computer system is connected to the programmable logic controller in the controller, it can detect and control various parameters and components of the device, mainly including: equipment component overview, battery parameters, salt concentration parameters and conditions, irrigation conditions, etc. The equipment component overview can view the operation status of each component and control it; the battery parameters can view the current battery power, charge and discharge status, output voltage, output current and battery temperature and other parameters and control them; the salt concentration parameters and conditions can view the salt concentration status of water in each water storage component, as well as the set salt concentration of irrigation water; the irrigation status includes the opening and closing status of each water pump, valve, the amount of water in each water tank, and the storage or flow status of water in the device and control them.

[0058] In some embodiments, multiple groups of lithium titanate batteries are connected in parallel to charge and discharge in turn, thereby ensuring a sustainable supply of electrical energy.

[0059] In some embodiments, a float level gauge is provided in the sedimentation tank 1, the pretreatment tank 3, the first sub-desalination tank 6, the second sub-desalination tank 7, the blending tank 10, the fresh water tank 9 and the irrigation tank 11, respectively, and the float level gauge is used to monitor the liquid level in each device. A salt concentration meter is provided in the sedimentation tank 1, the pretreatment tank 3, the first sub-desalination tank 6, the second sub-desalination tank 7, the blending tank 10 and the fresh water tank 9, respectively, and the salt concentration meter is used to monitor the salt concentration in each device. The float level gauge and the salt concentration meter are electrically connected to the computer system, respectively, and the computer system is electrically connected to the controller to transmit the monitored data information to the computer system in a timely manner, and then the computer system sends instructions to each device based on the data information.

[0060] Furthermore, in any two connected devices among the sedimentation tank 1, the primary filtration device 2, the pretreatment water tank 3, the first capacitive deionization device 4, the second capacitive deionization device 5, the brine tank 8, the first sub-desalination water tank 6, the second sub-desalination water tank 7, the blending water tank 10, the fresh water tank 9 and the irrigation water tank 11, the liquid inlet of one device is connected to the liquid outlet of the other device through a connecting pipe. An intelligent water pump is connected to the corresponding connecting pipe as needed to provide power for conveying water.

[0061] Furthermore, a first water pump is connected to the connecting pipe between the sedimentation tank 1 and the primary filter device 2 to facilitate the water in the sedimentation tank 1 to be transported to the primary filter device 2 and the water in the primary filter device 2 to be transported to the pretreatment water tank 3 .

[0062] A second water pump is connected to the connecting pipe between the pretreatment water tank 3 and the first capacitor deionization device 4 and the second capacitor deionization device 5, which is used to promote the water in the pretreatment water tank 3 to be transported to the first capacitor deionization device 4 and the second capacitor deionization device 5, and to promote the water in the first capacitor deionization device 4 and the second capacitor deionization device 5 to be transported to the brine tank 8, and to promote the water in the first capacitor deionization device 4 to be transported to the first sub-desalination water tank 6, and to promote the water in the second capacitor deionization device 5 to be transported to the second sub-desalination water storage tank.

[0063] The connecting pipe between the first sub-desalinated water tank 6 and the blending water tank 10 is connected to a third water pump for promoting the water in the first sub-desalinated water tank 6 to be transported to the blending water tank 10 .

[0064] The connecting pipe between the second sub-desalinated water tank 7 and the blending water tank 10 is connected to a fourth water pump for promoting the water in the second sub-desalinated water tank 7 to be transported to the blending water tank 10 .

[0065] A fifth water pump is connected to the connecting pipes between the fresh water tank 9 and the mixing water tank 10 and the irrigation water tank 11 to facilitate the water in the fresh water tank 9 to be transported to the mixing water tank 10 , and to transport the water in the mixing water tank 10 to the irrigation water tank 11 .

[0066] The connecting pipe between the first sub-desalinated water tank 6 and the pre-treatment water tank 3 is connected to a sixth water pump for promoting the water in the first sub-desalinated water tank 6 to be transported to the pre-treatment water tank 3 .

[0067] The connecting pipe between the second sub-desalinated water tank 7 and the pre-treatment water tank 3 is connected to a seventh water pump for promoting the water in the second sub-desalinated water tank 7 to be transported to the pre-treatment water tank 3 .

[0068] The first water pump, the second water pump, the third water pump, the fourth water pump, the fifth water pump, the sixth water pump and the seventh water pump are all intelligent water pumps. All the intelligent water pumps are electrically connected to the computer system through data lines to control the opening and closing of the water pumps.

[0069] Furthermore, electric stop valves are connected to corresponding connecting pipes as required, and all electric stop valves are electrically connected to the computer system via data cables to control the circulation of water.

[0070] Further, a first electric stop valve is connected to the connecting pipe between the sedimentation tank 1 and the primary filtration device 2, a second electric stop valve is connected to the connecting pipe between the primary filtration device 2 and the pretreatment water tank 3, a third electric stop valve is connected to the connecting pipe between the pretreatment water tank 3 and the first capacitive deionization device 4, a fourth electric stop valve is connected to the connecting pipe between the pretreatment water tank 3 and the second capacitive deionization device 5, a fifth electric stop valve is connected to the connecting pipe between the first capacitive deionization device 4 and the brine tank 8, a sixth electric stop valve is connected to the connecting pipe between the second capacitive deionization device 5 and the brine tank 8, a seventh electric stop valve is connected to the connecting pipe between the first capacitive deionization device 4 and the first sub-desalination water tank 6, an eighth electric stop valve is connected to the connecting pipe between the second capacitive deionization device 5 and the second sub-desalination water tank 7, a ninth electric stop valve is connected to the connecting pipe between the first sub-desalination water tank 6 and the pretreatment water tank 3, and a tenth electric stop valve is connected to the connecting pipe between the second sub-desalination water tank 7 and the pretreatment water tank 3. The first mixing electric stop valve is connected to the connecting pipe between the first sub-desalinated water tank 6 and the mixing water tank 10, the second mixing electric stop valve is connected to the connecting pipe between the second sub-desalinated water tank 7 and the mixing water tank 10, the third mixing electric stop valve is connected to the connecting pipe between the fresh water tank 9 and the mixing water tank 10, and the fourth mixing electric stop valve is connected to the connecting pipe between the mixing water tank 10 and the irrigation water tank 11.

[0071] like Figure 3 As shown, another embodiment of the present invention proposes a method for mixed irrigation of brackish water sub-salinity based on capacitive deionization technology, using the brackish water sub-salinity based on capacitive deionization technology continuous water production device, comprising the following steps:

[0072] When crops need irrigation, the salt concentration and water consumption of the required irrigation water are determined based on the crop information and input into the computer system. The computer system analyzes and sets the liquid level and salt concentration requirements of each device. After the setting is completed, the sedimentation tank 1 transports the brackish water to the primary filtration device 2 for primary filtration. The brackish water after primary filtration enters the pretreatment water tank 3.

[0073] After the water in the pretreatment water tank 3 reaches the set water level, the first capacitor deionization device 4 is set to the salt absorption mode, and the second capacitor deionization device 5 is set to the salt discharge mode. The water in the pretreatment water tank 3 enters the first capacitor deionization device 4 and the second capacitor deionization device 5 respectively. The concentrated brine treated by the second capacitor deionization device 5 flows into the brine tank 8, and the sub-desalinated water obtained after treatment by the first capacitor deionization device 4 flows into the first sub-desalinated water tank 6.

[0074] After the water level of the first sub-desalinated water tank 6 reaches the set value, it is detected whether the salt concentration of the sub-desalinated water in the first sub-desalinated water tank 6 reaches the set value. When the salt concentration does not reach the set value, the sub-desalinated water in the first sub-desalinated water tank 6 flows back to the pretreatment water tank 3 and is desalinated again through the first capacitive deionization device 4; when the salt concentration of the sub-desalinated water in the first sub-desalinated water tank 6 reaches the set value, the sub-desalinated water flows into the mixing water tank 10.

[0075] The fresh water tank 9 inputs fresh water into the blending water tank 10 according to the set value to mix with the desalinated water, so that the salt concentration of the desalinated water in the blending water tank 10 reaches the set value, and then the desalinated water is transported to the irrigation water tank 11 for irrigation.

[0076] When it is detected that the salt concentration at the end of the first capacitor deionization device 4 no longer changes, the first capacitor deionization device 4 is switched to the salt discharge mode, and the second capacitor deionization device 5 is switched to the salt absorption mode. The concentrated brine treated by the first capacitor deionization device 4 flows into the brine tank 8, and the sub-salted water treated by the second capacitor deionization device 5 flows into the second sub-salted water tank 7.

[0077] After the water level of the second sub-desalinated water tank 7 reaches the set value, it is detected whether the salt concentration of the sub-desalinated water in the second sub-desalinated water tank 7 reaches the set value. When the salt concentration does not reach the set value, the sub-desalinated water in the second sub-desalinated water tank 7 flows back to the pretreatment water tank 3 and is desalinated again through the second capacitive deionization device 5; when the salt concentration of the sub-desalinated water in the second sub-desalinated water tank 7 reaches the set value, the sub-desalinated water flows into the mixing water tank 10.

[0078] The fresh water tank 9 inputs fresh water into the blending water tank 10 according to the set value to mix with the sub-desalinated water, so that the salt concentration of the sub-desalinated water in the blending water tank 10 reaches the set value, and then the sub-desalinated water is transported to the irrigation water tank 11 for irrigation. When it is detected that the salt concentration at the end of the second capacitive deionization device 5 no longer changes, the second capacitive deionization device 5 is switched to the salt discharge mode, and the first capacitive deionization device 4 is switched to the salt absorption mode, and the above steps are repeated.

[0079] Furthermore, the crop information includes but is not limited to the crop variety, planting area, soil moisture at that time and other information.

[0080] Furthermore, when the crop needs irrigation, the salt concentration and water consumption of the required irrigation water are determined according to the crop variety, planting area, soil humidity at that time and other information, and input into the computer system. The computer system analyzes and sets the liquid level and salt concentration requirements of each device. After the setting is completed, the sedimentation tank 1 starts to take in water. After the water level reaches the connecting pipe between the sedimentation tank 1 and the primary filter device 2, the first electric stop valve is opened to allow the brackish water to flow into the primary filter device 2 for primary filtration. At the same time, the first water pump and the second electric stop valve are opened to allow the brackish water after primary filtration to enter the pretreatment water tank 3. After the water in the pretreatment water tank 3 reaches the set water level, the first capacitor deionization device 4 and the second capacitor deionization device 5 are selected as the salt absorption mode and the salt discharge mode, respectively. The battery generates electricity to provide electrical energy for the first capacitor deionization device 4 and the second capacitor deionization device 5.

[0081] If the first capacitor deionization device 4 is set to the salt absorption mode and the second capacitor deionization device 5 is set to the salt discharge mode, the second water pump and the third electric stop valve and the fourth electric stop valve are opened to allow the water in the pretreatment water tank 3 to enter the first capacitor deionization device 4 and the second capacitor deionization device 5 respectively. The sixth electric stop valve is opened to allow the concentrated salt water treated by the second capacitor deionization device 5 to flow into the brine tank 8. The seventh electric stop valve is opened to allow the sub-salted water treated by the first capacitor deionization device 4 to flow into the first sub-salted water tank 6. When the water level of the first sub-desalinated water tank 6 reaches the set value, it is detected whether the salt concentration of the sub-desalinated water in the first sub-desalinated water tank 6 reaches the set value. If the salt concentration does not reach the set value, the ninth electric stop valve and the sixth water pump are opened to make the sub-desalinated water in the first sub-desalinated water tank 6 flow back to the pretreatment water tank 3 and desalinate again through the first capacitor deionization device 4; if the salt concentration of the sub-desalinated water in the first sub-desalinated water tank 6 reaches the set value, the third water pump and the first mixing electric stop valve are opened to make the sub-desalinated water flow into the mixing water tank 10. At this time, the fifth water pump and the third mixing electric stop valve are opened to make the fresh water tank 9 input fresh water into the mixing water tank 10 according to the set value to mix with the sub-desalinated water, so that the salt concentration of the sub-desalinated water in the mixing water tank 10 reaches the set value, and then the fifth water pump reverses and opens the fourth mixing electric stop valve to transport the sub-desalinated water to the irrigation water tank 11, and the irrigation water tank 11 stores water for irrigation.

[0082] When it is detected that the salt concentration at the end of the first capacitor deionization device 4 no longer changes, the first capacitor deionization device 4 is switched to the salt discharge mode, and the second capacitor deionization device 5 is switched to the salt absorption mode. The second water pump and the third electric stop valve and the fourth electric stop valve are turned on to allow the water in the pretreatment water tank 3 to flow into the first capacitor deionization device 4 and the second capacitor deionization device 5 respectively. The fifth electric stop valve is turned on to allow the concentrated salt water treated by the first capacitor deionization device 4 to flow into the brine tank 8. The eighth electric stop valve is turned on to allow the sub-salted water obtained after the treatment by the second capacitor deionization device 5 to flow into the second sub-salted water tank 7.

[0083] When the water level of the second sub-desalinated water tank 7 reaches the set value, it is detected whether the salt concentration of the sub-desalinated water in the second sub-desalinated water tank 7 reaches the set value. If the salt concentration does not reach the set value, the tenth electric stop valve and the seventh water pump are opened to make the sub-desalinated water in the second sub-desalinated water tank 7 flow back to the pretreatment water tank 3 and desalinate again through the second capacitor deionization device 5; if the salt concentration of the sub-desalinated water in the second sub-desalinated water tank 7 reaches the set value, the fourth water pump and the second mixing electric stop valve are opened to make the sub-desalinated water flow into the mixing water tank 10. At this time, the fifth water pump and the third mixing electric stop valve are opened, and the fresh water tank 9 inputs fresh water into the mixing water tank 10 according to the set value to mix with the sub-desalinated water, so that the salt concentration of the sub-desalinated water in the mixing water tank 10 reaches the set value, and then the fifth water pump reverses and opens the fourth mixing electric stop valve to transport the sub-desalinated water to the irrigation water tank 11, and the irrigation water tank 11 stores water for irrigation.

[0084] When it is detected that the salt concentration at the end of the second capacitive deionization device 5 no longer changes, the second capacitive deionization device 5 is switched to the salt discharge mode, the first capacitive deionization device 4 is switched to the salt absorption mode, and the above steps are repeated.

[0085] The embodiment of the present invention can switch between the salt absorption mode and the salt discharge mode, and can realize continuous water production for irrigation, reducing the time required for system shutdown, maintenance and restart. It not only has obvious advantages in water supply stability, energy efficiency and water quality flexibility, but is also particularly suitable for application scenarios such as agricultural irrigation that have high requirements for water resource sustainability, so as to make efficient use of water resources.

[0086] The embodiments of the present invention can adjust the salt concentration of desalinated water to meet the needs of different salt-tolerant crops.

[0087] The capacitive deionization technology used in the embodiment of the present invention has the advantages of low energy consumption, easy installation, low pollution and sustainable utilization. The sub-salinated irrigation water can meet the irrigation needs of salt-tolerant crops in the arid areas of Northwest China, making full use of the regional characteristics of rich bitter and salty water resources in the arid areas of Northwest China and the large water demand for crop irrigation, promoting stable and sustainable agricultural irrigation in the arid areas, and providing targeted and adjustable brackish water irrigation for different salt-tolerant crops in the arid areas of Northwest China.

[0088] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0089] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] In the present invention, the term "some embodiments" and the like means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments and features of the different embodiments described in this specification without contradiction.

[0091] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A brackish water sub-salinity continuous water production and mixing irrigation device, characterized in that: include: A pretreatment component, the pretreatment component includes a primary filtering device and a pretreatment water tank, the pretreatment water tank has a liquid inlet and a liquid outlet, the liquid inlet of the pretreatment water tank is connected to the primary filtering device to filter the brackish water and then store it; A first capacitor deionization device and a second capacitor deionization device, wherein the first capacitor deionization device has a liquid inlet and a liquid outlet, the liquid inlet of the first capacitor deionization device is connected to the liquid outlet of the pretreatment water tank, the liquid outlet of the first capacitor deionization device is respectively connected to a first sub-desalinated water tank and a brine tank, the second capacitor deionization device has the same structure as the first capacitor deionization device and can be switched between a salt absorption mode and a salt discharge mode, the liquid inlet of the second capacitor deionization device is connected to the liquid outlet of the pretreatment water tank, the liquid outlet of the second capacitor deionization device is respectively connected to a second sub-desalinated water tank and a brine tank, and the first capacitor deionization device and the second capacitor deionization device are connected in parallel; A mixing water tank, the mixing water tank having a first liquid inlet, a second liquid inlet and a liquid outlet, a stirrer is arranged in the mixing water tank, the first liquid inlet of the mixing water tank is respectively connected to the liquid outlet of the first sub-desalinated water tank and the liquid outlet of the second sub-desalinated water tank, the second liquid inlet of the mixing water tank is connected to the fresh water tank, the liquid outlet of the mixing water tank is connected to the irrigation water tank, the liquid outlet of the irrigation water tank is connected to the irrigation water pipe, and the irrigation water pipe leads to the irrigation area; The pretreatment component further comprises a sedimentation water tank, wherein the sedimentation water tank has a liquid inlet and a liquid outlet, wherein the liquid inlet of the sedimentation water tank is connected to a pump to extract brackish water, and the liquid outlet of the sedimentation water tank is connected to the liquid inlet of the primary filtration device to transport the precipitated brackish water to the primary filtration device; The sedimentation water tank, the pretreatment water tank, the first sub-desalination water tank, the second sub-desalination water tank, the mixing water tank, the fresh water tank and the irrigation water tank are respectively provided with float level gauges, and the sedimentation water tank, the pretreatment water tank, the first sub-desalination water tank, the second sub-desalination water tank, the mixing water tank and the fresh water tank are respectively provided with salt concentration measuring instruments, and the float level gauge and the salt concentration measuring instrument are respectively electrically connected to the computer system.

2. The brackish water sub-desalination continuous water production and mixing irrigation device according to claim 1 is characterized in that: The first capacitive deionization device comprises a first support plate, a first silicone gasket, a deionization module, a second silicone gasket and a second support plate which are connected in sequence, the deionization module comprises an electrode sheet and a silicone frame, the electrode sheet and the silicone frame are respectively provided with a plurality of electrodes and are connected at intervals, the electrical properties of two adjacent electrode sheets are opposite, the first support plate, the first silicone gasket, the electrode sheet, the silicone frame, the second silicone gasket and the second support plate are respectively provided with liquid holes, and the liquid holes are connected with the liquid inlet and the liquid outlet of the first capacitive deionization device.

3. The brackish water sub-desalination continuous water production and mixing irrigation device according to claim 2 is characterized in that: The liquid holes of two adjacent electrode sheets are arranged in a staggered manner to form a baffle structure.

4. The brackish water sub-desalination continuous water production and mixing irrigation device according to claim 2, characterized in that: The first support plate and the second support plate are both made of acrylic material, the electrode sheet is a titanium plate coated with electrode material, and the electrode material is a composite material of activated carbon, polyvinylidene fluoride and conductive carbon black.

5. The brackish water sub-desalination continuous water production and mixing irrigation device according to claim 1, characterized in that: The primary filtration device comprises a screen filter and a granular activated carbon filter, and the granular activated carbon filter is connected between the screen filter and the pre-treatment water tank.

6. The brackish water sub-desalination continuous water production and mixing irrigation device according to claim 1, characterized in that: It also includes a power supply and storage component, which includes a lithium titanate battery and a controller. The lithium titanate battery is connected to an external power source and electrical equipment to store and provide electrical energy, and the controller connects the lithium titanate battery and the electrical equipment.

7. The brackish water sub-desalination continuous water production and mixing irrigation device according to claim 6, characterized in that: The lithium titanate storage batteries are arranged in multiple groups in parallel to be charged and discharged in turn.

8. A method for continuous water production and mixed irrigation of brackish water sub-desalination, characterized in that: The brackish water sub-salinity continuous water production and mixing irrigation device according to any one of claims 1 to 7 comprises the following steps: The required salt concentration and water consumption of the irrigation water are determined according to the crop information and input into the computer system. The computer system analyzes and sets the liquid level and salt concentration requirements of each device. After the setting is completed, the sedimentation tank transports the brackish water to the primary filtration device for primary filtration. The brackish water after the primary filtration enters the pretreatment water tank; After the water in the pretreatment water tank reaches the set water level, the first capacitor deionization device is set to the salt absorption mode, and the second capacitor deionization device is set to the salt discharge mode. The water in the pretreatment water tank enters the first capacitor deionization device and the second capacitor deionization device respectively. The concentrated salt water treated by the second capacitor deionization device flows into the brine tank, and the sub-salted water treated by the first capacitor deionization device flows into the first sub-salted water tank. After the water level of the first sub-desalinated water tank reaches a set value, it is detected whether the salt concentration of the sub-desalinated water in the first sub-desalinated water tank reaches a set value. When the salt concentration does not reach the set value, the sub-desalinated water in the first sub-desalinated water tank is made to flow back to the pretreatment water tank and be desalinated again through the first capacitive deionization device; when the salt concentration of the sub-desalinated water in the first sub-desalinated water tank reaches a set value, the sub-desalinated water is made to flow into the mixing water tank; The fresh water tank inputs fresh water into the blending water tank according to a set value to mix with the desalinated water, so that the salt concentration of the desalinated water in the blending water tank reaches the set value, and then the desalinated water is transported to the irrigation water tank for irrigation; When it is detected that the salt concentration at the end of the first capacitive deionization device no longer changes, the first capacitive deionization device is switched to a salt discharge mode, and the second capacitive deionization device is switched to a salt absorption mode, and the concentrated salt water treated by the first capacitive deionization device flows into the brine tank, and the sub-salted water treated by the second capacitive deionization device flows into the second sub-salted water tank; After the water level of the second sub-desalinated water tank reaches the set value, it is detected whether the salt concentration of the sub-desalinated water in the second sub-desalinated water tank reaches the set value. When the salt concentration does not reach the set value, the sub-desalinated water in the second sub-desalinated water tank is made to flow back to the pretreatment water tank and be desalinated again through the second capacitive deionization device; when the salt concentration of the sub-desalinated water in the second sub-desalinated water tank reaches the set value, the sub-desalinated water is made to flow into the mixing water tank; The fresh water tank inputs fresh water into the mixing water tank according to the set value and mixes it with the sub-desalinated water, so that the salt concentration of the sub-desalinated water in the mixing water tank reaches the set value, and then the sub-desalinated water is transported to the irrigation water tank for irrigation. When it is detected that the salt concentration at the end of the second capacitive deionization device no longer changes, the second capacitive deionization device is switched to a salt discharge mode, and the first capacitive deionization device is switched to a salt absorption mode, and the above steps are repeated.

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