Capacitive deionization device and system

Abstract

The present invention provides a capacitive deionization device and system device. The device includes a concentrated liquid chamber, the concentrated liquid chamber is divided into a cathode concentrated liquid chamber and an anode concentrated liquid chamber connected by an insulating partition, the cathode concentrated liquid chamber and the anode concentrated liquid chamber are both connected to a raw water chamber through an ion semipermeable membrane; current collectors are also provided on both sides of the insulating partition; an electrode is also provided in the concentrated liquid chamber, the electrode is annular and wound around the outer side of the insulating partition, and the electrode rotates around the insulating partition as the center, so that the part of the electrode located in the cathode concentrated liquid chamber enters the anode concentrated liquid chamber, and at the same time, the part of the electrode located in the anode concentrated liquid chamber enters the cathode concentrated liquid chamber. The present invention uses the method of electrode rotation to synchronously complete the ion adsorption raw water purification and counter-ion desorption electrode regeneration process in one chamber, with a simple structure, small volume, high electrode utilization rate, and high degree of automation.

Description

Technical Field

[0001] The invention belongs to the technical field of capacitive deionization, and in particular relates to a capacitive deionization device and system. Background Art

[0002] Capacitive deionization technology is based on the double-layer theory. An electrostatic field is applied between a pair of parallel plates. The charged particles in the solution between the plates migrate in a directional manner under the action of the electric field and are adsorbed on the electrode surface, reducing the ion concentration of the solution. After the electrode is saturated with adsorption, it is short-circuited or reversed. Under the action of electrostatic repulsion, the adsorbed ions are desorbed from the plate, achieving the regeneration of the electrode material, thereby removing dissolved salts in the water. It is an electrochemical water treatment technology with the advantages of low cost, low energy consumption, high efficiency at room temperature, easy regeneration, easy maintenance and environmental friendliness. Therefore, it is widely used in the fields of seawater desalination and wastewater desalination.

[0003] Currently, capacitive deionization devices can be divided into three categories according to the electrode type: fixed electrode device, mobile electrode device and rotating electrode device.

[0004] However, the three types of capacitive deionization devices in the prior art usually have the problems of low electrode utilization and large device size. Summary of the invention

[0005] In order to overcome the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a capacitive deionization device and system to solve the problems of low electrode utilization and large device size in traditional deionization devices.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] The first aspect of the present invention provides a capacitive deionization device, including a concentrate chamber, wherein the concentrate chamber is divided into a cathode concentrate chamber and an anode concentrate chamber which are connected by an insulating partition, wherein the cathode concentrate chamber and the anode concentrate chamber are both connected to a raw water chamber via an ion semipermeable membrane; current collectors are also provided on both sides of the insulating partition, respectively; an electrode is also provided in the concentrate chamber, wherein the electrode is annular and is wound around the outer side of the insulating partition, and the electrode rotates around the insulating partition so that the portion of the electrode located in the cathode concentrate chamber enters the anode concentrate chamber, and at the same time, the portion of the electrode located in the anode concentrate chamber enters the cathode concentrate chamber.

[0008] Furthermore, the electrode and the insulating separator are connected via a rotating wheel.

[0009] Furthermore, the rotating wheel is controlled by a rotating wheel controller to adjust the rotation speed of the electrode.

[0010] Furthermore, the electrode is a strip electrode.

[0011] Furthermore, the cathode concentrate chamber is provided with a flushing water inlet, and the anode concentrate chamber is provided with a concentrate outlet; flushing water enters the concentrate chamber from the flushing water inlet, carries the desorbed ions and then flows out from the concentrate outlet.

[0012] Furthermore, the current collector includes a cathode current collector and an anode current collector, the cathode current collector is connected to the negative electrode of the power supply, and the anode current collector is connected to the positive electrode of the power supply.

[0013] Furthermore, the raw water chamber includes a cathode raw water chamber and an anode raw water chamber, and the ion semipermeable membrane includes a cation semipermeable membrane and an anion semipermeable membrane; the cathode concentrate chamber is connected to the cathode raw water chamber through the cation semipermeable membrane, and the anode concentrate chamber is connected to the anode raw water chamber through the anion semipermeable membrane.

[0014] A second aspect of the present invention provides a capacitive deionization system, which includes the capacitive deionization device as described above; when the number of the capacitive deionization devices is at least two, at least two of the capacitive deionization devices are connected in series or in parallel.

[0015] Further, when the number of the capacitive deionization devices is at least three, at least three of the capacitive deionization devices are connected in series and / or in parallel.

[0016] Furthermore, two adjacent capacitive deionization devices connected in series share a raw water chamber.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention provides a capacitive deionization device and system device. The device adopts a rotatable annular electrode, which takes into account the high stability of the fixed electrode device and the high adsorption efficiency of the mobile electrode device, and is easy to realize the continuous process. The present invention utilizes the characteristics of the electrode rotation form combined with the ion semipermeable membrane, and sets the ion adsorption raw water purification and counter-ion desorption electrode regeneration process in a chamber to complete synchronously, avoiding the electrode idling phenomenon and improving the electrode utilization rate. At the same time, the higher counter-ion concentration in the concentrated liquid chamber provides additional driving force for the ions to be separated from the raw water, increasing the ion transfer efficiency. Moreover, since the ion adsorption and desorption processes are carried out synchronously, the desorption area of ​​the traditional capacitive deionization device is reduced and the device volume is reduced. Multiple sets of devices are connected in parallel to process raw water in batches, with a simple structure, a high degree of automation, convenient maintenance, and easy production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Unless otherwise stated, the pictures in the drawings do not constitute proportional limitations.

[0020] Figure 1 A schematic diagram of the structure of a capacitive deionization device provided by the present invention;

[0021] Figure 2 A schematic structural diagram of a capacitive deionization system provided by the present invention.

[0022] In the figure, 1-insulating partition;

[0023] 2-Current collector;

[0024] 3- Strip electrode;

[0025] 4-concentrate chamber, 401-cathode concentrate chamber, 402-anode concentrate chamber, 411-rinsing water inlet, 412-concentrate outlet;

[0026] 5-ion semipermeable membrane, 501-cation semipermeable membrane, 502-anion semipermeable membrane;

[0027] 6-raw water chamber, 601-cathode raw water chamber, 602-anode raw water chamber;

[0028] 7-wheel;

[0029] 8-wheel controller;

[0030] 9- Power supply. DETAILED DESCRIPTION

[0031] As can be seen from the background technology, the capacitor deionization device can be divided into three categories according to the electrode type: fixed electrode device, mobile electrode device and rotating electrode device. Among them, the electrodes of the fixed electrode capacitor deionization device are rigid and fixed, and the salt water flows between the electrode plates to realize the contact between the electrode plates and the ions. Since the entire capacitor deionization process requires adsorption and desorption to run alternately, it is not easy for the fixed electrode to realize a continuous desalination process. The mobile electrode capacitor deionization device changes the rigid electrode plate into a flowable electrolytic suspension, and the adsorption process and the desorption process are separated. Although the problem of continuous operation is solved, the electrolyte regeneration is not thorough, which is easy to cause the loss of active material particles, produce secondary pollution, and affect the operation effect. The fixed electrode needs to be powered off or the power supply is reversed during the desorption process, resulting in the process cannot be continuously operated. Although the mobile electrode can run continuously, the desorption process needs to be carried out outside the adsorption system. In this process, the flowing electrode has no adsorption effect, and the electrode utilization rate is low. CN111453820A discloses a track-shaped rotating electrode, which effectively overcomes the problem that fixed electrodes are not easy to continuously process and the flowing electrode electrolyte is not completely regenerated. However, the ion adsorption and electrode regeneration processes are still carried out separately. On the one hand, the electrode is bound to be in an idling state for part of the time, resulting in a problem of low electrode utilization. On the other hand, since the ion desorption and adsorption processes are carried out separately, the equipment volume is increased, which is not conducive to transportation and installation.

[0032] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0033] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "an", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may also be an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or coupling. The term "and / or" used herein includes any unit and all combinations of one or more associated listed items.

[0034] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless defined as herein.

[0035] To facilitate the understanding of the implementation examples of the present invention, further explanation will be given below by taking specific implementation examples as examples in conjunction with the drawings. The implementation examples do not constitute a limitation on the implementation of the present invention.

[0036] like Figure 1 As shown, the present invention provides a capacitive deionization device, comprising a current collector 2, an ion semipermeable membrane 5, a concentrate chamber 4 and a raw water chamber 6, which are symmetrically distributed on both sides of an insulating partition 1 from the inside to the outside.

[0037] In the present invention, the annular electrode 3 is wound around the insulating partition 1 , passes through the concentrated liquid chamber 4 , and is connected to the areas on both sides of the insulating partition 1 under the drive of the rotating wheel 7 .

[0038] Preferably, the electrode 3 is a strip electrode, thereby increasing the adsorption area.

[0039] In the present invention, the ions in the raw water chamber 6 are directed to move through the ion semipermeable membrane 5 and are enriched on the electrode 3 under the action of the electric field force of the current collector 2, completing the deionization process of the raw water. The electrode 3 fragments enriched with ions enter the concentrated liquid chamber 4 on the symmetrical plane under the drive of the rotor 7. Under the action of the reverse electric field provided by the symmetrical current collector 2, the desorbed ions synchronously adsorb the counter ions. The electrode 3 fragments adsorbing the counter ions are returned to the concentrated liquid chamber 4 to complete the desorption, and the next stage of the adsorption process is carried out again to complete the cycle.

[0040] In the present invention, the rotation speed of the electrode 3 is regulated by controlling the rotation speed of the wheel 7 through the wheel controller 8 .

[0041] In the present invention, the ion semipermeable membrane 5 allows ions to enter while preventing counter ions from flowing out of the concentrate chamber 4 .

[0042] Furthermore, the electric field force provided by the current collector 2 attracts ions in the raw water chamber 6 and repels counter ions on the electrode 3 .

[0043] Furthermore, a flushing water inlet 411 is provided on one side of the concentrate chamber 4 , and a concentrate outlet 412 is provided on the other side. The flushing water continuously enters the concentrate chamber 4 from the flushing water inlet 411 , and flows out from the concentrate outlet 412 after carrying the desorbed ions.

[0044] Furthermore, the concentrated solution chamber 4 simultaneously completes the ion adsorption purification of raw water and the counter ion desorption electrode regeneration process.

[0045] Furthermore, the desorbed counter ions in the concentrate chamber 4 increase the potential difference of the concentrate chamber, prompting the ions in the raw water to pass through the semipermeable membrane into the concentrate chamber, thereby increasing the driving force for the ions in the raw water to enter the concentrate chamber.

[0046] Preferably, multiple sets of devices are connected in parallel to achieve batch purification of raw water.

[0047] It can be seen that the ions in the raw water chamber 6 move directionally through the ion semipermeable membrane 5 under the action of the electric field force of the current collector 2 and are enriched on the strip electrode to complete the deionization process of the raw water. The strip electrode 3 fragments enriched with ions enter the concentrated liquid chamber 4 on the symmetrical plane under the drive of the runner 7. Under the action of the reverse electric field provided by the symmetrical current collector 2, the desorbed ions adsorb counterions synchronously. The strip electrode 3 fragments adsorbing counterions return to the concentrated liquid chamber 4 to complete desorption, and the adsorption process of the next stage is carried out again to complete the cycle. During the entire operation process, the ions in the raw water chamber 6 continue to enter the concentrated liquid chamber 4, and the ion adsorption and counterion desorption processes in the concentrated liquid chamber 4 are carried out uninterruptedly, so that the entire system operates continuously and efficiently. Multiple sets of devices are used in parallel or in series to achieve batch purification of raw water. The capacitive deionization device provided by the present invention inherits the dual advantages of fixed electrodes and mobile electrodes, and solves the problems of low electrode utilization and large volume of conventional capacitive deionization devices. The present invention utilizes the electrode rotation mode to synchronously complete the ion adsorption raw water purification and counter ion desorption electrode regeneration process in one chamber, ensuring the efficient and continuous operation of the deionization process, with simple structure, small volume, high electrode utilization rate, high degree of automation, convenient maintenance and easy production.

[0048] The present invention also provides a capacitive deionization system, such as Figure 2 As shown, on one side of the insulating partition 1, from the inside to the outside, there are distributed anion current collector 201, cation semipermeable membrane 501, cathode concentrate chamber 401 and cathode raw water chamber 6, and on the other side, there are distributed symmetrically from the inside to the outside, there are distributed cation current collector 201, anion semipermeable membrane 501, anode concentrate chamber 401 and anode raw water chamber 6.

[0049] In the present invention, the annular electrode 3 is wound around the insulating partition 1 , passes through the cathode concentrated solution chamber 401 and the anode concentrated solution chamber 402 , and is connected to the areas on both sides of the insulating partition 1 under the drive of the rotating wheel 7 .

[0050] In the present invention, the cations in the cathode raw water chamber 601 are directed to move through the cation semipermeable membrane 501 under the action of the electric field force of the cathode current collector 201 and are enriched on the electrode 3 located in the cathode concentrate chamber 401, thereby completing the process of removing the cations in the raw water. Then, the electrode 3 fragments enriched with cations enter the anode concentrate chamber 402 on the symmetrical plane under the drive of the rotor 7, and are affected by the electric field provided by the anode current collector 202. On the one hand, the electric field provided by the anode current collector 202 exhibits electrostatic repulsion to the cations adsorbed on the strip electrode, accelerating the desorption of the adsorbed cations on the electrode. On the other hand, the electric field provided by the anode current collector 202 exhibits electrostatic attraction to the anions in the raw water, accelerating the anions in the anode raw water chamber 202 to pass through the anion semipermeable membrane 502, enter the anode concentrate chamber 402, and finally adsorb on the strip electrode.

[0051] During the entire operation, the cation desorption and anion adsorption processes proceed synchronously and continuously. The annular electrode 3 that has adsorbed anions rotates back to the cathode concentrate chamber 401 again. Under the action of the electric field repulsion provided by the anion current collector, the anions that have been adsorbed by the annular electrode are desorbed. At the same time, the cations in the cathode raw water chamber 601, under the action of the electric field attraction, cross the cation semipermeable membrane 501 and enter the cathode concentrate chamber 401, and are finally adsorbed on the annular electrode 3 to complete the cycle.

[0052] Preferably, the anion semipermeable membrane 502 allows anions in the anode raw water chamber 602 to enter the anode concentrate chamber 402 on the one hand, and prevents cations desorbed from the anode concentrate chamber 402 from entering the anode raw water chamber 602 on the other hand.

[0053] Similarly, the anion semipermeable membrane 501 allows cations in the cathode raw water chamber 601 to enter the cathode concentrate chamber 401 on the one hand, and prevents anions desorbed from the cathode concentrate chamber 401 from entering the cathode raw water chamber 601 on the other hand.

[0054] Furthermore, the rotation speed of the electrode 3 is regulated by controlling the rotation speed of the wheel 7 through the wheel controller 8 .

[0055] Preferably, the higher the ion concentration in the raw water, the faster the rotation speed of the belt electrode.

[0056] Preferably, the electrode 3 is a flexible annular conductive material with abundant pores, which can provide active sites for the adsorption of charged ions, such as activated carbon cloth, etc. Its function is to realize the adsorption of ions in the water body and transfer the adsorbed ions to the concentrated liquid chamber 6 on the symmetry plane to complete desorption, while realizing regeneration and restoring its own adsorption capacity.

[0057] Furthermore, a flushing water inlet is provided on one side of the concentrate chamber, and a concentrate outlet is provided on the other side. The flushing water continuously enters the concentrate chamber from the flushing water inlet, and flows out from the concentrate outlet after carrying the desorbed ions.

[0058] Furthermore, the anode concentrate chamber 402 simultaneously completes the anion adsorption purification of raw water and the cation desorption electrode regeneration process. After cation desorption, the cation concentration in the anode concentrate chamber 402 is higher than that in the anode raw water chamber 602, forming a potential difference, thereby accelerating the anions in the anode raw water chamber 602 to enter the anode concentrate chamber 402.

[0059] Similarly, the cathode concentrate chamber 401 simultaneously completes the cation adsorption purification of raw water and the anion desorption electrode regeneration process. After anion desorption, the anion concentration in the cathode concentrate chamber 401 is higher than that in the cathode raw water chamber 601, forming an electric potential difference, thereby accelerating the cations in the cathode raw water chamber 601 to enter the cathode concentrate chamber 401.

[0060] Preferentially, if Figure 2 As shown, multiple sets of devices are connected in parallel, and two adjacent sets of devices share a raw water chamber 6 to remove ions and counterions in the raw water respectively.

[0061] In summary, during the entire operation of the present invention, raw water continuously flows in the raw water chamber 6, the electrode 3 continuously rotates, ions in the raw water continuously enter the concentrate chamber, the concentrate chamber continuously completes the ion adsorption and counter-ion desorption process, the ion concentrate in the concentrate chamber continuously flows out, and the entire system continuously operates to ensure that the deionization process is carried out efficiently and stably.

[0062] The present invention utilizes the electrode rotation form combined with the characteristics of the anion and cation semipermeable membrane selectively permeating ions, and sets the ion adsorption raw water purification and counter ion desorption electrode regeneration process in one chamber to be completed synchronously, avoiding the electrode idling phenomenon and improving the electrode utilization rate. At the same time, the higher counter ion concentration in the concentrated liquid chamber provides additional driving force for the ions to separate from the raw water, increasing the ion transfer efficiency. Furthermore, since the ion adsorption and desorption processes are carried out synchronously, the desorption area of ​​the traditional capacitive deionization device is reduced and the device volume is reduced. Multiple sets of devices are connected in parallel to batch process raw water, with a simple structure, a high degree of automation, convenient maintenance, and convenient production.

[0063] Those skilled in the art can understand that the accompanying drawings are only schematic diagrams of an embodiment, and the modules or processes in the accompanying drawings are not necessarily required to implement the present invention.

[0064] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device or system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The device and system embodiments described above are merely schematic, in which the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative work.

[0065] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A capacitive deionization device, characterized in that: The invention comprises a concentrated solution chamber (4), wherein the concentrated solution chamber (4) is divided into a cathode concentrated solution chamber (401) and an anode concentrated solution chamber (402) which are connected by an insulating partition (1), and the cathode concentrated solution chamber (401) and the anode concentrated solution chamber (402) are both connected to a raw water chamber (6) via an ion semipermeable membrane (5); Current collectors (2) are also provided on both sides of the insulating partition (1); An electrode (3) is also arranged in the concentrated solution chamber (4); the electrode (3) is annular and is arranged around the outer side of the insulating partition (1); the electrode (3) performs a rotational motion with the insulating partition (1) as the center, so that the portion of the electrode (3) located in the cathode concentrated solution chamber (401) enters the anode concentrated solution chamber (402), and at the same time, the portion of the electrode (3) located in the anode concentrated solution chamber (402) enters the cathode concentrated solution chamber (401); The electrode (3) and the insulating partition (1) are connected via a rotating wheel (7); The electrode (3) is a strip electrode; The current collector (2) comprises a cathode current collector (201) and an anode current collector (202), wherein the cathode current collector (201) is connected to the negative electrode of a power source (9), and the anode current collector (202) is connected to the positive electrode of the power source (9).

2. The capacitive deionization device according to claim 1, characterized in that: The rotating wheel (7) is controlled by a rotating wheel controller (8) to adjust the rotation speed of the electrode (3).

3. The capacitive deionization device according to claim 1, characterized in that: The cathode concentrate chamber (401) is provided with a flushing water inlet (411), and the anode concentrate chamber (402) is provided with a concentrate outlet (412); flushing water enters the concentrate chamber (4) from the flushing water inlet (411), carries desorbed ions, and flows out from the concentrate outlet (412).

4. The capacitive deionization device according to claim 1, characterized in that: The raw water chamber (6) comprises a cathode raw water chamber (601) and an anode raw water chamber (602); the ion semipermeable membrane (5) comprises a cation semipermeable membrane (501) and an anion semipermeable membrane (502); the cathode concentrated solution chamber (401) is connected to the cathode raw water chamber (601) via the cation semipermeable membrane (501); the anode concentrated solution chamber (402) is connected to the anode raw water chamber (602) via the anion semipermeable membrane (502).

5. A capacitive deionization system, characterized in that: The system comprises a capacitive deionization device as claimed in any one of claims 1 to 4; When the number of the capacitive deionization devices is at least two, at least two of the capacitive deionization devices are connected in series or in parallel.

6. The capacitive deionization system according to claim 5, characterized in that: In the case where the number of the capacitive deionization devices is at least three, at least three of the capacitive deionization devices are connected in series and / or Connected in parallel.

7. The capacitive deionization system according to claim 6, characterized in that: Two adjacent capacitive deionization devices connected in series share a raw water chamber (6).

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