A rotary flexible electrode capacitor deionization device and method

Abstract

The present invention discloses a rotary flexible electrode capacitive deionization device and method, belonging to the field of electrochemical desalination technology. By respectively extending the column shells at both ends of the device into the liquid to be treated and the desorption liquid, the outer surfaces of the electrode belts on both sides of the electrode unit that are close to and parallel to each other are energized, so that the gap between the outer surfaces of the electrode belts forms an adsorption area and a desorption area. Through the rotary electrode belt, the dual advantages of the fixed electrode and the flow motor are taken into account, and the problems of the fixed electrode being difficult to be continuous and the flow electrode capacitive deionization electrode having poor conductivity and easy sedimentation or loss of electrode active materials are solved. This device has the characteristics of high stability of the fixed electrode and high adsorption efficiency of the flow electrode and easy continuous operation. The transmission of the electrode belt and the simultaneous rotation of the drainage paddle are realized by the rotation of the transmission roller. The drainage of several drainage paddles forms a unidirectional liquid flow trend in the column shell, thereby accelerating the speed of liquid treatment.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrochemical desalination, and in particular relates to a rotary flexible electrode capacitor deionization device and method. Background Art

[0002] Capacitive deionization (CDI) is an electrochemical water treatment technology that utilizes the phenomenon of charged electrodes adsorbing ions in water, thereby removing dissolved salts from the water. This technology is widely used in seawater desalination, industrial and agricultural water treatment, and domestic water desalination. Compared with conventional methods, CDI offers advantages such as low cost, low energy consumption, high efficiency at room temperature, easy regeneration, simple maintenance, and environmental friendliness, making it considered a highly promising desalination technology.

[0003] Capacitive deionization technology is based on the double-layer theory. An electrostatic field is applied between a pair of parallel plates. Charged particles in the bath between the plates migrate in a direction under the action of the electric field and are adsorbed on the electrode surface, reducing the ion concentration of the solution. After the electrodes are saturated with adsorption, they are short-circuited or reversed. Under the action of electrostatic repulsion, the adsorbed ions are desorbed from the plates, achieving regeneration of the electrode material.

[0004] Currently, capacitive deionization technologies primarily utilize fixed and mobile electrodes. Fixed electrodes remain stationary, while saltwater flows between the plates to create contact between the plates and ions. However, since the entire capacitive deionization process requires alternating adsorption and desorption, continuous desalination is difficult to achieve. Mobile electrodes replace solid plates with mobile electrode suspensions, separating the adsorption and desorption processes and addressing the issue of continuous operation. However, suspended electrodes exhibit poor conductivity, and precipitation can affect the motor area. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a rotary flexible electrode capacitor deionization device and method, which solves the technical problems of low conductivity and easy precipitation of the deionization device.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention includes an inverted U-shaped casing, in which two inverted U-shaped electrode units are arranged, and the electrode unit includes an electrode belt, four transmission rollers and two guide rollers, the four transmission rollers are distributed at four corners, the electrode belt is wrapped around the outside of the transmission roller in an inverted U shape, and the two guide rollers are pressed against the outside of the electrode belt to tighten the electrode belt; one of the electrode units is arranged on the inner side of the recess of the other electrode unit, and the two sides of the two electrode units are close to each other and parallel, and a conductive roller is respectively provided on the left and right sides of the two close electrode belts, and the transmission roller at the upper left position of a single electrode unit is driven to rotate by a motor, and the two sides of the casing are respectively cylindrical shells with closed bottoms, and the two sides of the electrode unit are respectively located in the cylindrical shells, and the transmission roller is rotatably arranged on the inner side of the cylindrical shell, and relative drainage holes are opened on the cylindrical shell, and drainage paddles are rotatably provided on the drainage holes, and the drainage paddles are driven to rotate by the transmission rollers.

[0008] Furthermore, the diversion paddle includes a swivel, a paddle body and a gear ring. The swivel is rotatably arranged on the inside of the diversion hole, the paddle body is coaxially fixed inside the swivel, the gear ring is coaxially fixed on the outside of the swivel, and the transmission roller is coaxially provided with drive teeth. The drive teeth are located on the outside of the column shell, and the drive teeth are engaged with the gear ring.

[0009] Furthermore, a plurality of water holes are provided on the column shell.

[0010] Furthermore, all the diversion paddles rotate in the same direction.

[0011] Furthermore, a filter housing covering the drainage hole is provided on the outside of the column housing, and a scraping portion is provided on the column housing. The scraping portion includes a limit plate fixed on the casing, and a plurality of vertical rods are provided on the limit plate for vertical movement. The lower end of the vertical rod is fixed with a C-shaped scraping strip, and the upper end is fixed with a blocking strip. The C-shaped scraping strip is also fixed with a floating plate, and the inner sides of the C-shaped scraping strip are in sliding contact with the two pieces of the filter housing.

[0012] Furthermore, the electrode belt includes a plurality of electrode plates connected in sequence, and the electrode plates are connected by insulating buckles.

[0013] Furthermore, the inner side of the electrode belt is provided with grouser teeth, and the outer side of the transmission roller is provided with tooth grooves that engage with the grouser teeth.

[0014] Furthermore, the electrode belt includes a flexible conductive belt, a flexible conductive layer and an ion exchange membrane which are arranged in sequence.

[0015] Furthermore, the conductive roller includes a roller body and a conductive shell wrapped around the outer periphery of the roller body, and the conductive shell is connected to a power source through an electric wire.

[0016] A method for deionization using a rotary flexible electrode capacitive deionization device, characterized in that:

[0017] S1: Place the two side shells of the deionization device in the liquid to be treated and the desorption liquid respectively;

[0018] S2: The left conductive roller in the treated liquid is connected to the anode of the power supply, and the right conductive roller is connected to the cathode of the power supply; the left conductive roller in the desorption liquid is connected to the cathode of the power supply, and the right conductive roller is connected to the anode of the power supply;

[0019] S3: The motor drives the transmission roller to rotate and perform deionization treatment.

[0020] The beneficial effects of the present invention are:

[0021] 1. By extending the column shells at both ends of the equipment into the liquid to be treated and the desorption liquid respectively, and by electrifying the outer surfaces of the electrode belts on both sides of the electrode unit that are close to and parallel to each other, the gap between the outer surfaces of the electrode belts forms an adsorption area and a desorption area. Through the rotary motor belt, this structure takes into account the dual advantages of fixed electrodes and flow motors, solving the problems of the fixed electrode being difficult to be continuous and the flow electrode capacitive deionization electrode having poor conductivity and the electrode active material being easy to settle or lose. This equipment has the characteristics of high stability of the fixed electrode and high adsorption efficiency of the flow electrode and easy realization of continuous process.

[0022] 2. The electrode belt is conveyed and the drainage paddle is rotated simultaneously by the rotation of the transmission roller. The drainage of several drainage paddles forms a unidirectional liquid flow trend in the column shell, which accelerates the speed of liquid treatment. The unidirectional liquid flow allows the sediment to be discharged from the column shell.

[0023] 3. In this structure, the filter housing is used to block large impurities to prevent them from blocking the transmission structure, and the scraping part is used to scrape off blockages on the filter housing caused by long-term water treatment. This structure ensures the circulation and use of water treatment.

[0024] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the purpose, technical solutions and beneficial effects of the present invention more clear, the present invention provides the following drawings for illustration:

[0026] Figure 1 This is an overall schematic diagram of a deionization device according to an embodiment of the present invention;

[0027] Figure 2This is a schematic diagram of the internal structure of a casing according to an embodiment of the present invention;

[0028] Figure 3 This is a structural diagram of the column shell according to an embodiment of the present invention;

[0029] Figure 4 A cross-sectional view of a column housing according to an embodiment of the present invention;

[0030] Figure 5 This is a schematic structural diagram of a diversion paddle according to an embodiment of the present invention;

[0031] Figure 6 This is a schematic structural diagram of a conductive roller according to an embodiment of the present invention;

[0032] Figure 7 This is a schematic structural diagram of an electrode plate according to an embodiment of the present invention;

[0033] Figure 8 This is a schematic structural diagram of a conductive roller according to an embodiment of the present invention;

[0034] Figure 9 This is a schematic structural diagram of a scraping portion according to an embodiment of the present invention;

[0035] The markings in the accompanying drawings are as follows: 1. Casing; 11. Column shell; 12. Drainage hole; 13. Water hole; 2. Electrode unit; 21. Electrode belt; 22. Drive roller; 221. Tooth groove; 23. Guide roller; 3. Conductive roller; 31. Roller body; 32. Conductive shell; 4. Drainage paddle; 41. Rotating ring; 42. Paddle body; 43. Gear ring; 44. Drive tooth; 45. Transmission tooth; 5. Filter housing; 6. Scraping part; 61. Limiting plate; 62. Vertical rod; 63. Baffle bar; 64. C-shaped scraper bar; 65. Floating plate; 7. Electrode plate; 71. Insulating buckle; 72. Track tooth; 73. Flexible conductive belt; 74. Flexible conductive layer; 75. Ion exchange membrane; 8. Adsorption area; 9. Desorption area. DETAILED DESCRIPTION

[0036] like Figures 1 to 9 As shown, the present invention provides a rotary flexible electrode capacitor deionization device, referring to Figure 1 as well as Figure 2 , including an inverted U-shaped housing 1, which can be made of insulating material; two inverted U-shaped electrode units 2 are provided in the housing 1, and the electrode units 2 include an electrode belt 21, four transmission rollers 22 and two guide rollers 23. The four transmission rollers 22 are distributed at four corners, and the electrode belt 21 surrounds the outer side of the transmission roller 22 in an inverted U shape, such as Figure 7 and Figure 8As shown, the inner side of the electrode belt 21 is provided with a grouser 72, the outer side of the drive roller 22 is provided with a tooth groove 221 engaged with the grouser 72, and the two guide rollers 23 are pressed against the outer side of the electrode belt 21 to tighten the electrode belt 21; the electrode belt 21 includes a flexible conductive belt 73, a flexible conductive layer 74 and an ion exchange membrane 75 arranged in sequence, and the electrode belt 21 is composed of a plurality of electrode plates 7 connected in sequence, and the electrode plates 7 are connected by insulating buckles 71; one of the electrode units 2 is arranged on the inner side of the recess of the other electrode unit 2, and the two sides of the electrode units 2 are close to and parallel to each other, and a conductive roller 3 is provided on the left and right sides of the two close electrode belts 21, respectively. Figure 6 The conductive roller 3 includes a roller body 31 and a conductive shell 32 wrapped around the outer periphery of the roller body 31. The conductive shell 32 is connected to the power supply through a wire. The two conductive rollers 3 on one side of the electrode unit 2 are connected to the positive and negative poles of the power supply. The transmission roller 22 at the upper left position of the single electrode unit 2 is driven by the motor to rotate. Driven by the motor, the electrode belt 21 on one side of the electrode unit 2 is slowly transferred to the other side of the electrode unit 2. Figure 1 、 Figure 3 and Figure 4 As shown, the housing 1 has two sides with closed bottom cylindrical shells 11, and the two sides of the electrode unit 2 are respectively located in the cylindrical shells 11. The transmission roller 22 is rotatably arranged inside the cylindrical shell 11. At the inner bottom end of the cylindrical shell 11, two transmission rollers 22 are arranged side by side. The rotating shafts of the two transmission rollers 22 pass through the cylindrical shell 11 from both ends of the transmission rollers 22 and are respectively connected to a driving tooth 44. On the side of the cylindrical shell 11, two drainage holes 12 are opened on each driving tooth 44. A drainage paddle 4 is rotatably provided on the drainage hole 12. Figure 5 The drainage paddle 4 shown in the figure includes a swivel 41, a paddle body 42 and a gear ring 43. The paddle body 42 is coaxially fixed inside the swivel 41, and the gear ring 43 is coaxially fixed outside the swivel 41. The swivel 41 is rotatably arranged on the inside of the drainage hole 12, and a transmission tooth 45 is also provided between the two drainage holes 12 above the driving tooth 44, so that the driving tooth 44, the drainage paddle 4, the transmission tooth 45, and the drainage paddle 4 are engaged in sequence. Under this structure, the paddle bodies 42 of all the drainage paddles 4 on the column shell 11 on one side of the shell have the same deflection angle in the same direction, so that all the drainage paddles 4 have the same rotation direction and the same direction of fluid transmission.

[0037] This deionization device is used for electrolytic treatment of sewage. The two end shells 11 of the device are respectively extended into the liquid to be treated and the desorption liquid. By energizing the outer surfaces of the electrode belts 21 on one side of the electrode unit 2, which are close to and parallel to each other, the gap between the outer surfaces of the electrode belts 21 forms an adsorption zone 8. Figure 2Schematic diagram of ion transfer on the left side of the electrode unit 2 in the figure. Under the electric field drive of the anode conductive roller 3 and the cathode conductive roller 3, the ions in the liquid to be treated form a directional migration and are adsorbed into the electrode belt 21, thereby achieving purification of the liquid to be treated; the electrode belt 21 can be transferred to the other side of the electrode unit 2 along the transmission roller 22. The conductive roller 3 on the other side of the electrode unit 2 is arranged opposite to form a desorption zone 9 between the outer surfaces of the electrode belt 21 on the other side of the electrode unit 2, and the ions in the electrode belt 21 migrate into the desorption liquid again; this structure takes into account the dual advantages of fixed electrodes and flow motors, and solves the problem of difficult connection of fixed electrodes. The problem of poor conductivity of deionized electrodes and easy sedimentation or loss of active electrode materials due to continuous and mobile electrode capacitance is solved. This equipment has the characteristics of high stability of fixed electrodes and high adsorption efficiency of mobile electrodes and is easy to realize continuous process. In addition, this structure can adjust the rotation speed according to the purification requirements of the liquid to be treated, and can accurately control the treatment time of the liquid. This structure has strong continuity and can ensure efficient operation of liquid treatment. The present invention also forms a continuous ion storage section of the electrode belt 21 by arranging an insulating buckle 71, which effectively prevents the electrode belt 21 in the adsorption area 8 and the analysis area 9 from short circuiting, thereby ensuring stable operation of the equipment.

[0038] This device also drives several drainage paddles 4 located on the column shell 11 to rotate through the rotation of the transmission roller 22, causing the water flow to move; the drainage paddle 4 is provided with a paddle body 42 inside the rotating ring 41, and the rotating ring 41 is rotated outside the drainage hole 12 of the column shell 11, so that the entire drainage paddle 4 structure is flat, not easy to be damaged, and not easy to cause bumps and impacts on other structures; the water holes 13 arranged around the drainage hole 12 can avoid the water pressure difference inside and outside the column shell 11 being too large, resulting in insufficient water flow in the column shell 11. The transmission of the electrode belt 21 and the simultaneous rotation of the drainage paddle 4 are achieved through the rotation of the transmission roller 22. The drainage of several drainage paddles 4 forms a unidirectional liquid flow trend in the column shell 11, accelerates the speed of liquid treatment, and discharges the sediment out of the column shell 11 through the unidirectional liquid flow.

[0039] In a further solution, Figure 1 and Figure 9As shown, the outside of the column housing 11 is provided with a filter housing 5 covering the drainage hole 12, and further includes a scraping portion 6 provided on the column housing 11, the scraping portion 6 includes a limit plate 61 fixed to the housing 1, and a plurality of vertical rods 62 are provided on the limit plate 61 for vertical movement. The lower end of the vertical rod 62 is fixedly connected to a C-shaped scraping strip 64, and the upper end is fixedly connected to a blocking strip 63. The C-shaped scraping strip 64 is also fixed with a floating plate 65. The inner sides of the C-shaped scraping strip 64 slide in contact with the two pieces of the filter housing 5. When this When the device is placed in water in two areas, the middle section of the casing 1 is placed on the shore of the pool, and the two column shells 11 are respectively inserted into the water. At this time, under the action of buoyancy, the C-shaped scraper 64 floats on the water surface and is located at the upper end of the filter housing 5. When the water treatment is completed or the filter housing 5 is blocked, the entire device is lifted, and the C-shaped scraper 64 moves downward under the action of gravity to clean the filter housing 5. If necessary, an outlet for sediment discharge can be opened at the bottom of the filter housing 5 in the direction of sediment discharge from the column shell 11 to avoid the problem of sediment being difficult to clean.

[0040] In this structure, the filter housing 5 is used to block large impurities to prevent the transmission structure from being stuck by large impurities, and the scraper 6 is used to scrape off blockages on the filter housing 5 caused by long-term water treatment; this structure ensures the circulation and use of water treatment.

[0041] The method for deionization using a rotary flexible electrode capacitive deionization device is as follows:

[0042] S1: placing the column shells 11 on both sides of the deionization device in the liquid to be treated and the desorption liquid respectively;

[0043] S2: The left conductive roller 3 in the liquid to be treated is connected to the anode of the power supply, and the right conductive roller 3 is connected to the cathode of the power supply; the left conductive roller 3 in the desorption liquid is connected to the cathode of the power supply, and the right conductive roller 3 is connected to the anode of the power supply;

[0044] S3: The motor drives the transmission roller 22 to rotate and perform deionization treatment.

[0045] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A rotary flexible electrode capacitive deionization device, characterized by: The invention comprises an inverted U-shaped housing (1), wherein two inverted U-shaped electrode units (2) are arranged in the housing (1), wherein the electrode unit (2) comprises an electrode belt (21), four transmission rollers (22) and two guide rollers (23), wherein the four transmission rollers (22) are distributed at four corners, wherein the electrode belt (21) is wrapped around the outside of the transmission rollers (22) in an inverted U shape, and the two guide rollers (23) are pressed against the outside of the electrode belt (21) to tighten the electrode belt (21); wherein one electrode unit (2) is arranged inside the recess of the other electrode unit (2), and the two sides of the two electrode units (2) are close to each other and parallel, and a conductive roller (3) is respectively arranged on the left and right sides of the two close electrode belts (21), and the transmission roller (22) at the upper left position of a single electrode unit (2) is driven to rotate by a motor, and the two sides of the housing (1) are respectively closed at the bottom. The column shell (11) is provided with a cylindrical shell (11), the two sides of the electrode unit (2) are respectively located in the column shell (11), the transmission roller (22) is rotatably arranged on the inner side of the column shell (11), the column shell (11) is provided with a drainage hole (12) opposite to the column shell, the drainage hole (12) is rotatably provided with a drainage paddle (4), and the drainage paddle (4) is driven to rotate by the transmission roller (22); the drainage paddle (4) comprises a rotating ring (41), a paddle body (42) and a gear ring (43), the rotating ring (41) is rotatably arranged on the inner side of the drainage hole (12), the paddle body (42) is coaxially fixed inside the rotating ring (41), the gear ring (43) is coaxially fixed outside the rotating ring (41), the transmission roller (22) is coaxially provided with a driving tooth (44), the driving tooth (44) is located outside the column shell (11), and the driving tooth (44) is meshed with the gear ring (43).

2. The rotary flexible electrode capacitive deionization device according to claim 1, characterized in that: A plurality of water holes (13) are provided on the column shell (11).

3. The rotary flexible electrode capacitive deionization device according to claim 1, characterized in that: All the drainage paddles (4) rotate in the same direction.

4. The rotary flexible electrode capacitive deionization device according to claim 1, characterized in that: The column housing (11) is provided with a filter housing (5) covering the drainage hole (12) on the outside thereof, and further includes a scraping portion (6) provided on the column housing (11), the scraping portion (6) including a limit plate (61) fixed on the housing (1), a plurality of vertical rods (62) being provided on the limit plate (61) for vertical movement, the lower ends of the vertical rods (62) being fixedly connected to C-shaped scraping strips (64), and the upper ends of the vertical rods (62) being fixedly connected to blocking strips (63), the C-shaped scraping strips (64) being further fixed to floating plates (65), and the inner sides of the C-shaped scraping strips (64) being in sliding contact with the two filter housings (5).

5. The rotary flexible electrode capacitive deionization device according to claim 1, characterized in that: The electrode belt (21) comprises a plurality of electrode plates (7) connected in sequence, wherein the electrode plates (7) are connected via insulating buckles (71).

6. The rotary flexible electrode capacitive deionization device according to claim 1, characterized in that: Grouser teeth (72) are provided on the inner side of the electrode belt (21), and tooth grooves (221) meshing with the groove teeth (72) are provided on the outer side of the transmission roller (22).

7. The rotary flexible electrode capacitive deionization device according to claim 1, characterized in that: The electrode belt (21) comprises a flexible conductive belt (73), a flexible conductive layer (74), and an ion exchange membrane (75) which are arranged in sequence.

8. The rotary flexible electrode capacitive deionization device according to claim 1, characterized in that: The conductive roller (3) comprises a roller body (31) and a conductive shell (32) wrapped around the outer periphery of the roller body (31), and the conductive shell (32) is connected to a power source via an electric wire.

9. A rotary flexible electrode capacitive deionization method, characterized by: The use of the rotary flexible electrode capacitive deionization device according to any one of claims 1 to 8 comprises the following steps: S1: placing the column shells (11) on both sides of the deionization device in the liquid to be treated and the desorption liquid respectively; S2: The left conductive roller (3) in the liquid to be treated is connected to the anode of the power supply, and the right conductive roller (3) is connected to the cathode of the power supply; the left conductive roller (3) in the desorption liquid is connected to the cathode of the power supply, and the right conductive roller (3) is connected to the anode of the power supply; S3: The motor drives the transmission roller (22) to rotate and perform deionization treatment.

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