Capacitive seawater desalination device and applications thereof

Abstract

The application relates to the technical field of salt water desalination, in particular to a capacitive salt water desalination device and application thereof. The desalination device comprises a water tank, a charging power supply, a driving motor and a plurality of electrode modules. Each electrode module comprises a circular ring electrode, a charging brush and a discharging brush. A plurality of connecting rods are arranged between the inner ring and the outer ring of the circular ring electrode. A pair of electrode plates are arranged in the cavity formed between the inner ring, the outer ring and two adjacent connecting rods. The plurality of electrode modules are arranged on the rotating shaft of the driving motor through the inner rings. The charging brush and the discharging brush are arranged on the two sides of the part below the water surface of the water tank along the inner ring and are rotationally connected with the electrode plates. The charging brush is connected with the charging power supply, and the discharging brush is connected with the driving motor. The water tank is provided with a fresh water outlet on the side of the charging brush and a concentrated water outlet on the side of the discharging brush. The desalination device can realize effective desalination of concentrated salt water and recycling of charging electric energy in actual application.

Description

Technical Field

[0001] This invention relates to the field of brine desalination technology, specifically to a capacitive brine desalination device and its application. Background Technology

[0002] With the increasing scarcity of water resources, traditional water treatment technologies face numerous challenges in treating highly saline water, seawater, and industrial wastewater. Specifically, these shortcomings of traditional water treatment technologies are mainly reflected in the following aspects:

[0003] High energy consumption: Traditional membrane water treatment technologies such as reverse osmosis and dialysis operate at high pressures, consume a lot of energy, and have high operating costs. These technologies mainly rely on high-pressure pumps to provide power to separate water molecules through membrane pores, while removing dissolved salts and other impurities. However, this treatment method not only consumes a lot of energy, but may also lead to membrane fouling and damage, increasing maintenance costs.

[0004] Low treatment efficiency: While some traditional water treatment technologies, such as chemical precipitation and adsorption, can remove certain impurities from water, their treatment efficiency is relatively low, making it difficult to meet the needs of large-scale, high-efficiency water treatment. This is especially true for water bodies with high salinity, high hardness, or containing specific ions, where the treatment effect of these technologies is often unsatisfactory.

[0005] Secondary pollution risk: Some water treatment technologies require the addition of chemical agents during the treatment process, and these agents may remain in the treated water, causing secondary pollution. In addition, some membrane technologies may also experience membrane fouling during use, leading to a decline in effluent quality.

[0006] Complex equipment and high maintenance costs: Some traditional water treatment equipment has a complex structure and is cumbersome to operate, requiring professional technicians for maintenance and upkeep. This not only increases operating costs but may also affect the stability and reliability of the equipment.

[0007] Therefore, there is an urgent need for a capacitive brine desalination device to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to address the problems of high energy consumption, low processing efficiency, risk of secondary pollution, complex equipment, and high maintenance costs in existing concentrated brine treatment technologies, and to provide a capacitive brine desalination device and its application.

[0009] To achieve the above objectives, the first aspect of the present invention provides a capacitive brine desalination device, which includes a water tank, a charging power supply, a drive motor connected to an external driving power supply, and several electrode modules.

[0010] Each electrode module includes a circular electrode plate, a charging brush, and a discharging brush. Several connecting rods are provided between the inner and outer rings of the circular electrode plate. Pairs of electrode plates are installed in the cavity formed by the inner ring, the outer ring, and two adjacent connecting rods. Several electrode modules are installed on the rotating shaft of the drive motor at intervals through their inner rings. The charging brush and the discharging brush are respectively arranged on both sides of the portion of the inner ring below the water surface of the water tank and are rotatably connected to the electrode plates. The charging brush is connected to the charging power supply, and the discharging brush is connected to the drive motor. The water tank has a fresh water outlet on the charging brush side and a concentrated water outlet on the discharging brush side.

[0011] Preferably, both the charging brush and the discharging brush are arc-shaped, and the arc length of the charging brush is greater than the arc length of the discharging brush.

[0012] Preferably, the arc length of the charging brush is 4-8 times the arc length of the discharging brush.

[0013] Preferably, the inner ring, outer ring, and several connecting rods of the annular electrode are all made of insulating material.

[0014] Preferably, the electrode sheet is made of nano-graphene composite material or activated carbon.

[0015] Preferably, the electrode sheet is fan-shaped.

[0016] Preferably, the system also includes a sedimentation tank, which has a brine inlet at the bottom and an overflow outlet on the upper side. The overflow outlet is connected to the water inlet of the water tank via a pipeline.

[0017] Preferably, the sedimentation tank is provided with at least one layer of filter screen arranged parallel to the brine inlet.

[0018] Preferably, the overflow outlet of the sedimentation tank is equipped with a salt content monitoring instrument, which is used to dynamically adjust the adsorption voltage of the charging power supply and / or the speed of the drive motor according to the salt content of the overflow water; the charging power supply is a DC power supply and the drive motor is a DC motor.

[0019] The second aspect of the present invention provides the application of the aforementioned capacitive brine desalination device in brine desalination.

[0020] According to the above technical solution, in practical application of this capacitive brine desalination device, the rotating shaft of the drive motor rotates counterclockwise under the action of an external drive power supply. When it rotates to the charging brush, the electrode plates of the multiple spaced electrode modules are connected to the charging power supply and charged under the action of the charging power supply, thereby forming an electric field. Under the action of the electric field, soluble ions (such as sodium ions, chloride ions, etc.) in the water to be treated are attracted to the surface of the electrode plates, forming a double electric layer structure, realizing the separation of water molecules and soluble ions, and forming a desalination zone in the water tank. When it rotates to the discharge brush, the electrode plates are connected to the discharge brush and discharge, thereby recovering the power of the charging power supply to drive the drive motor to rotate and realizing the transfer and desorption of soluble ions in the concentrated water zone. Thus, based on the alternation of charging adsorption and discharge desorption, the concentrated brine is effectively desalinated while the charging energy is recovered and utilized. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a capacitor-type brine desalination device;

[0022] Figure 2 This is a schematic diagram of the electrode module of a capacitive brine desalination device.

[0023] Explanation of reference numerals in the attached figures

[0024] 1. Water tank; 2. Water inlet; 3. Fresh water outlet; 4. Concentrated water outlet; 5. Charging power supply; 6. Drive motor; 7. Circular electrode plate; 71. Inner ring; 72. Outer ring; 73. Connecting rod; 74. Electrode plate; 8. Charging brush; 9. Discharging brush. Detailed Implementation

[0025] The following provides a detailed description of specific embodiments of the present invention. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the present invention.

[0026] The first aspect of this invention provides a capacitive brine desalination device, such as... Figure 1-2 As shown, the capacitor-type brine desalination device includes a water tank 1, a charging power supply 5, a drive motor 6 connected to an external drive power supply, and several electrode modules.

[0027] Each electrode module includes a circular electrode plate 7, a charging brush 8, and a discharging brush 9. A plurality of connecting rods 73 are provided between the inner ring 71 and the outer ring 72 of the circular electrode plate 7. A pair of electrode plates 74 are installed in the cavity formed by the inner ring 71, the outer ring 72, and two adjacent connecting rods 73. A plurality of electrode modules are installed at intervals on the rotating shaft of the drive motor 6 through their inner rings 71. The charging brush 8 and the discharging brush 9 are respectively arranged on both sides of the portion of the water tank 1 below the water surface along the inner ring 71 and are rotatably connected to the electrode plates 74. The charging brush 8 is connected to the charging power supply 5, and the discharging brush 9 is connected to the drive motor 6. The water tank 1 has a fresh water outlet 3 on the charging brush side and a concentrated water outlet 4 on the discharging brush side.

[0028] Specifically, the positive and negative terminals of the charging brush 8 are rotatably connected to the positive and negative terminals of the two pairs of electrode plates 74, respectively; the positive and negative terminals of the discharging brush 9 are rotatably connected to the positive and negative terminals of the two pairs of electrode plates 74, respectively; the positive and negative terminals of the charging brush 8 are connected to the positive and negative terminals of the charging power supply 5, respectively; and the positive and negative terminals of the discharging brush 9 are connected to the positive and negative terminals of the drive motor 6, respectively.

[0029] According to the above technical solution, in practical application of this capacitive brine desalination device, the rotating shaft of the drive motor rotates counterclockwise under the action of an external drive power supply. When it rotates to the charging brush, the electrode plates of the multiple spaced electrode modules are connected to the charging power supply and charged under the action of the charging power supply, thereby forming an electric field. Under the action of the electric field, soluble ions (such as sodium ions, chloride ions, etc.) in the water to be treated are attracted to the surface of the electrode plates, forming a double electric layer structure, realizing the separation of water molecules and soluble ions, and forming a desalination zone in the water tank. When it rotates to the discharge brush, the electrode plates are connected to the discharge brush and discharge, thereby recovering the power of the charging power supply to drive the drive motor to rotate and realizing the transfer and desorption of soluble ions in the concentrated water zone. Thus, based on the alternation of charging adsorption and discharge desorption, the concentrated brine is effectively desalinated while the charging energy is recovered and utilized.

[0030] In the capacitive brine desalination device described in this invention, preferably, as follows: Figure 2As shown, both the charging brush 8 and the discharging brush 9 are arc-shaped, with the arc length of the charging brush 8 being greater than that of the discharging brush 9. By setting the charging brush 8 and the discharging brush 9 to arc shapes corresponding to the inner ring 71, they can better connect and contact with the electrode plate 74. Furthermore, by setting the arc length of the charging brush 8 to be greater than that of the discharging brush 9, the electrode plates 74 can have sufficient time to charge in the freshwater zone, allowing the electric field generated by charging to fully adsorb soluble ions in the water to be treated; and to fully discharge in the concentrated water zone, thus ensuring effective desorption of soluble ions while simultaneously recovering and utilizing the charging energy. In a more preferred embodiment, the arc length of the charging brush 8 is 4-8 times the arc length of the discharging brush 9, further ensuring sufficient adsorption of soluble ions in the freshwater zone and effective desorption of soluble ions in the concentrated water zone.

[0031] In the capacitive brine desalination device described in this invention, preferably, as follows: Figure 2 As shown, the inner ring 71, outer ring 72, and several connecting rods 73 of the annular electrode 7 are all made of insulating material. By using insulating material, such as rubber, for mounting the paired electrode plates 74, not only can the electrode plates 74 in each cavity section function independently to achieve the adsorption and desorption of soluble ions in the water to be treated, but also, if one or more electrode plates 74 in the cavity section fail, it will not affect the normal operation of the electrode plates 74 in other cavity sections. Furthermore, by using nano-graphene composite materials or activated carbon with high specific surface area and good conductivity, the adsorption effect and adsorption rate of soluble ions in the water to be treated can be further effectively improved. Furthermore, by designing the electrode plates 74 as fan-shaped and installing them in the cavity, the adsorption rate of soluble ions in the water to be treated can be further effectively improved by increasing the contact area with the water to be treated.

[0032] In the capacitive brine desalination device of the present invention, preferably, a sedimentation tank is further included. The sedimentation tank has a brine inlet at its bottom and an overflow outlet on its upper side. The overflow outlet is connected to the inlet 2 of the water tank 1 via a pipeline. By setting up a sedimentation tank to pre-treat the water entering the water tank 1, larger impurities in the water can be effectively prevented from directly entering the water tank 1 and affecting the adsorption efficiency of the electrode plate 74 for soluble ions in the water. In a more preferred embodiment, the sedimentation tank is provided with at least one layer of filter screen arranged parallel to the brine inlet. This further effectively intercepts and filters impurities in the water, and, based on the buffering and diversion effect of the filter screen, allows the water to enter the water tank 1 slowly, avoiding water flow impact and turbulence that could affect the adsorption effect of the electrode plate 74 on soluble ions. In a specific embodiment, the freshwater outlet 3 and concentrated water outlet 4 of the water tank 1 are respectively located on both sides of its inlet 2.

[0033] In the capacitive brine desalination device of the present invention, preferably, the overflow port of the sedimentation tank is equipped with a salt content monitoring instrument, which is used to dynamically adjust the adsorption voltage of the charging power supply 5 and / or the rotation speed of the drive motor 6 according to the salt content of the overflow water, thereby effectively improving the adsorption effect of brine and stabilizing the salt content of the freshwater at the freshwater outlet 3 within a set range without large fluctuations. More preferably, a salt content monitoring instrument is installed at the freshwater outlet 3, which is used to further dynamically adjust the adsorption voltage of the charging power supply 5 and / or the rotation speed of the drive motor 6 according to the salt content of the freshwater, thereby further stabilizing the salt content of the freshwater at the freshwater outlet 3 within a set range based on feedback regulation. In another preferred embodiment, the charging power supply 5 is a DC power supply, and the drive motor 6 is a DC motor, thereby ensuring the stability of the electrode plate 74 when adsorbing soluble ions in the water, and thus improving the adsorption effect.

[0034] A second aspect of the present invention provides the application of the capacitive brine desalination device described above in brine desalination. Specifically, it is applied, for example, in the desalination process of high-salinity water, seawater, and desulfurization wastewater with high salinity.

[0035] The present invention will be described in detail below through embodiments, but the scope of protection of the present invention is not limited thereto.

[0036] Example 1

[0037] Adopting such Figure 1-2 The capacitor-type brine desalination device shown is used for desalination of concentrated brine. Specifically, the capacitor-type brine desalination device includes a water tank 1, a charging power supply 5, a drive motor 6 connected to an external drive power supply, and several electrode modules.

[0038] Each electrode module includes a circular electrode plate 7, a charging brush 8, and a discharging brush 9. A plurality of connecting rods 73 are provided between the inner ring 71 and the outer ring 72 of the circular electrode plate 7. A pair of electrode plates 74 are installed in the cavity formed by the inner ring 71, the outer ring 72, and two adjacent connecting rods 73. A plurality of electrode modules are installed at intervals on the rotating shaft of the drive motor 6 through their inner rings 71. The charging brush 8 and the discharging brush 9 are respectively arranged on both sides of the portion of the inner ring 71 below the water surface of the water tank 1 and are rotatably connected to the electrode plates 74. The charging brush 8 is connected to the charging power supply 5, and the discharging brush 9 is connected to the drive motor 6. The water tank 1 has a fresh water outlet 3 on the charging brush side and a concentrated water outlet 4 on the discharging brush side.

[0039] The overflow outlet of the sedimentation tank is equipped with a salt content monitoring instrument, which is used to dynamically adjust the adsorption voltage of the charging power supply 5 and / or the rotation speed of the drive motor 6 according to the salt content of the overflow water; the charging power supply 5 is a DC power supply, and the drive motor 6 is a DC motor; both the charging brush 8 and the discharging brush 9 are arc-shaped, and the arc length of the charging brush 8 is greater than the arc length of the discharging brush 9; the arc length of the charging brush 8 is 6 times the arc length of the discharging brush 9.

[0040] Specifically, such as Figure 2 As shown, the inner ring 71 and outer ring 72 of the annular electrode plate 7 are divided into eight cavities by eight connecting rods 73, each cavity being equipped with paired electrode plates 74. Charging brushes 8 and discharging brushes 9 are rotatably positioned relative to the electrode plates 74. In practical applications, the rotating shaft of the drive motor 6 rotates counterclockwise under the action of an external driving power supply. When it rotates to the charging brush 8, the electrode plates 74 of the multiple spaced electrode modules are connected to the charging power supply 5 and charged under its action, thus forming an electric field. Under the action of this electric field, soluble ions (such as sodium ions, chloride ions, etc.) in the water to be treated are attracted to the surface of the electrode plates, forming a double-layer structure, achieving the separation of water molecules and soluble ions, and forming a double-layer structure within the water tank 1. Figure 2 The freshwater area is shown; when it rotates to the discharge brush 9, the electrode plate 74 connects to the discharge brush 9 and discharges, thereby recovering the electricity from the charging power supply 5 to drive the drive motor 6 to rotate, and realizing the soluble ions in... Figure 2 The process involves the transfer and desorption of concentrated brine in the concentrated brine zone. Furthermore, based on the alternation of charging adsorption and discharging desorption, the concentrated brine is effectively desalinated while simultaneously recovering and utilizing the charging energy.

[0041] Testing has shown that, compared with existing technologies, the capacitive brine desalination device described in this invention can achieve efficient desalination of concentrated brine while simultaneously recovering and utilizing the charging energy. It also has the advantages of being pollution-free and having low maintenance and operating costs.

[0042] Example 2

[0043] The implementation is similar to Example 1, except that the inner ring 71, outer ring 72 and several connecting rods 73 of the annular electrode 7 are all made of insulating rubber, and the electrode sheet 74 is made of nano-graphene composite material and is fan-shaped.

[0044] Testing revealed that the capacitive brine desalination device described in this invention, compared to the solution in Example 1, can further improve the desalination effect and rate for high-salinity water.

[0045] Example 3

[0046] The embodiment is implemented with reference to Example 2, except that it also includes a sedimentation tank. The bottom of the sedimentation tank is provided with a brine inlet, and the upper side is provided with an overflow outlet. The overflow outlet is connected to the water inlet 2 of the water tank 1 through a pipeline. The interior of the sedimentation tank is provided with at least one layer of filter screen arranged parallel to the brine inlet.

[0047] Testing revealed that the capacitive brine desalination device described in this invention, compared to the solution in Example 2, can further improve the desalination effect for high-salinity water.

[0048] The capacitive brine desalination device provided by this invention, in practical application, involves the drive motor rotating counterclockwise under the action of an external drive power supply. When it rotates to the charging brush, the electrode plates of the multiple spaced electrode modules are connected to the charging power supply and charged under its action, thereby forming an electric field. Under the action of the electric field, soluble ions (such as sodium ions, chloride ions, etc.) in the water to be treated are attracted to the surface of the electrode plates, forming a double-layer structure, realizing the separation of water molecules and soluble ions, and forming a desalination zone in the water tank. When it rotates to the discharge brush, the electrode plates are connected to the discharge brush and discharge, thereby recovering the power from the charging power supply to drive the drive motor and realizing the transfer and desorption of soluble ions in the concentrated water zone. Thus, based on the alternation of charging adsorption and discharge desorption, effective desalination of concentrated brine is achieved while simultaneously recovering and utilizing the charging energy.

[0049] The preferred embodiments of the present invention have been described in detail above; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention. To avoid unnecessary repetition, the present invention will not describe all possible combinations separately. However, these simple modifications and combinations should also be considered as part of the content disclosed in this invention and are all within the protection scope of this invention.

Claims

1. A capacitive brine desalination device, characterized in that, The capacitive brine desalination device includes a water tank (1), a charging power supply (5), a drive motor (6) connected to an external drive power supply, and several electrode modules. Each electrode module includes a circular electrode plate (7), a charging brush (8), and a discharging brush (9). A plurality of connecting rods (73) are provided between the inner ring (71) and the outer ring (72) of the circular electrode plate (7). A pair of electrode plates (74) are installed in the cavity formed by the inner ring (71), the outer ring (72), and two adjacent connecting rods (73). A plurality of electrode modules are installed on the rotating shaft of the drive motor (6) at intervals through their inner rings (71). The charging brush (8) and the discharging brush (9) are respectively arranged on both sides of the portion of the water tank (1) below the water surface along the inner ring (71) and are rotatably connected to the electrode plates (74). The charging brush (8) is connected to the charging power supply (5), and the discharging brush (9) is connected to the drive motor (6). The water tank (1) has a fresh water outlet (3) on the charging brush side and a concentrated water outlet (4) on the discharging brush side. Both the charging brush (8) and the discharging brush (9) are arc-shaped, and the arc length of the charging brush (8) is greater than the arc length of the discharging brush (9). The electrode sheet (74) is made of nano-graphene composite material or activated carbon.

2. The capacitive brine desalination device according to claim 1, characterized in that, The arc length of the charging brush (8) is 4-8 times the arc length of the discharging brush (9).

3. The capacitive brine desalination device according to claim 1, characterized in that, The inner ring (71), outer ring (72), and several connecting rods (73) of the circular electrode (7) are all made of insulating material.

4. The capacitive brine desalination device according to claim 1 or 3, characterized in that, The electrode sheet (74) is fan-shaped.

5. The capacitive brine desalination device according to claim 1, characterized in that, It also includes a sedimentation tank, which has a brine inlet at the bottom and an overflow outlet on the upper side. The overflow outlet is connected to the inlet (2) of the water tank (1) through a pipeline.

6. The capacitive brine desalination device according to claim 5, characterized in that, The sedimentation tank is equipped with at least one layer of filter screen arranged parallel to the brine inlet.

7. The capacitive brine desalination device according to claim 5, characterized in that, The overflow outlet of the sedimentation tank is equipped with a salt content monitoring instrument, which is used to dynamically adjust the adsorption voltage of the charging power supply (5) and / or the speed of the drive motor (6) according to the salt content of the overflow water; the charging power supply (5) is a DC power supply and the drive motor (6) is a DC motor.

8. The application of the capacitive brine desalination device according to any one of claims 1-7 in brine desalination.

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