CN111545070A - Electrodialysis device - Google Patents
Electrodialysis device Download PDFInfo
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- CN111545070A CN111545070A CN202010465985.0A CN202010465985A CN111545070A CN 111545070 A CN111545070 A CN 111545070A CN 202010465985 A CN202010465985 A CN 202010465985A CN 111545070 A CN111545070 A CN 111545070A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
- B01D61/46—Apparatus therefor
- B01D61/48—Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
- B01D61/54—Controlling or regulating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
- C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
- C02F1/4695—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis electrodeionisation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/04—Backflushing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/22—Electrical effects
- B01D2321/223—Polarity reversal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention relates to the technical field of electrodialysis devices and discloses an electrodialysis device. The electrodialysis device comprises an ionization filtering device, a liquid inlet pipe section and a liquid outlet pipe section, wherein the ionization filtering device comprises a first interface and a second interface which are positioned on one side, and a third interface and a fourth interface which are positioned on the other side, each interface in the first interface, the second interface and the third interface and the fourth interface is connected with the interface pipe section, each interface pipe section is connected with the liquid inlet pipe section and the liquid outlet pipe section in parallel, a liquid inlet control valve is arranged on each liquid inlet pipe section, a liquid outlet control valve is arranged on each liquid outlet pipe section, each liquid inlet control valve and each liquid outlet control valve can be opened and closed to enable the ionization filtering device to form a forward flow state and a reverse flow state which flow in opposite directions, so that surface scaling in the electrodialysis device is avoided or reduced, and meanwhile, the interface pipe sections can be cleaned. The electrodialysis device can prolong the service life of the ion exchange membrane, reduce the current loss and improve the desalination efficiency.
Description
Technical Field
The invention relates to the technical field of electrodialysis devices, in particular to an electrodialysis device.
Background
Electrodialysers are generally composed of main components such as water distribution plates, ion exchange membranes, electrodes, clamping devices, etc., for example, water distribution plates, anion exchange membranes (negative membranes) and cation exchange membranes (positive membranes) are alternately arranged in sequence between positive and negative electrodes to form multi-layered compartments. Under the action of an external electric field between the positive electrode and the negative electrode, anions and cations in the aqueous solution entering the compartment can directionally migrate to the anode and the cathode respectively, and because the positive membrane only allows cations to pass and prevents anions from passing, and the negative membrane only allows anions to pass and prevents cations from passing (namely if the fixed charge on the ion exchange membrane is opposite to the charge of the ions, the ions can pass, and if the charges of the ions are the same, the ions are repelled), the anions and the cations in the dilute chamber migrate to the adjacent concentrated chamber, so that the salt-containing water is desalinated.
After the electrodialyzer is used for a long time, the ion exchange membrane can generate the condition of surface scaling, thereby reducing the service life of the ion exchange membrane and influencing the desalination effect of the salt-containing water. Therefore, in order to prolong the service life of the ion exchange membrane, the prior art generally adopts a method of reversing the polarities of the positive and negative electrodes, namely, reversing the polarities of the positive and negative electrodes at regular intervals so as to automatically clean dirt formed on the surfaces of the ion exchange membrane and the electrodes and ensure the long-term stability of the working efficiency of the ion exchange membrane and the quality and quantity of fresh water.
Disclosure of Invention
The invention aims to provide an electrodialysis device, which can prolong the service life of an ion exchange membrane and improve the desalination efficiency.
The invention provides an electrodialysis device which comprises an ionization filtering device, a liquid inlet pipe section and a liquid outlet pipe section, wherein the ionization filtering device comprises a first connector and a second connector which are positioned on one side, and a third connector and a fourth connector which are positioned on the other side, each of the first connector, the second connector, the third connector and the fourth connector is connected with a connector pipe section, each connector pipe section is connected with the liquid inlet pipe section and the liquid outlet pipe section in parallel, a liquid inlet control valve is arranged on each liquid inlet pipe section, and a liquid outlet control valve is arranged on each liquid outlet pipe section, wherein each liquid inlet control valve and each liquid outlet control valve can be opened and closed so that a forward flow state and a reverse flow state with opposite flow directions can be formed in the ionization filtering device.
In the technical scheme, each interface is connected with an interface pipe section, each interface pipe section is connected with a liquid inlet pipe section and a liquid outlet pipe section in parallel, each liquid inlet pipe section is provided with a liquid inlet control valve, each liquid outlet pipe section is provided with a liquid outlet control valve, so that in actual use of the electrodialysis device, one part of the liquid inlet control valves can be controlled to open and the other part of the liquid inlet control valves are controlled to close, and meanwhile, one part of the liquid outlet control valves are controlled to open and the other part of the liquid outlet control valves are controlled to close, so that liquid in the ionization filtering device flows in a positive flow state, and scales along the positive flow direction can be adhered to an ion exchange membrane, a water distribution network and the interface pipe sections of the electrodialysis device after the electrodialysis. Then, one part of the liquid inlet control valve can be controlled to close and the other part of the liquid inlet control valve is controlled to open, and meanwhile, one part of the liquid outlet control valve is controlled to close and the other part of the liquid outlet control valve is controlled to open, so that the liquid flow in the ionization filtering device is in a backflow state, the liquid flow direction in the backflow state is opposite to the liquid flow direction in the forward flow state, and the liquid flow direction in the backflow state is opposite to the scale adhered along the forward flow direction, therefore, the liquid flow in the backflow state can be reversely and continuously cut into the washing scale to peel off the scale, and therefore, the surface scale in the electrodialysis device can be avoided or reduced, and meanwhile, the interface pipe section. Therefore, the electrodialysis device can prolong the service life of the ion exchange membrane, reduce the current loss and improve the desalination efficiency.
Furthermore, the liquid inlet pipe section connected with the first interface and the liquid inlet pipe section connected with the third interface are connected in parallel with a first liquid inlet main pipe section, and a first liquid inlet main control valve is arranged on the first liquid inlet main pipe section.
Furthermore, the liquid inlet pipe section connected with the second interface and the liquid inlet pipe section connected with the fourth interface are connected in parallel with a second liquid inlet main pipe section, and a second liquid inlet main control valve is arranged on the second liquid inlet main pipe section.
Further, along the liquid outlet direction, a TDS detection device positioned at the downstream of the liquid outlet control valve is arranged on each liquid outlet pipe section.
Further, the electrodialysis device comprises a cocurrent flow mode, in which the flow direction of each flow path in the positive flow state is the same, and the flow direction of each flow path in the reverse flow state is the same.
Further, in the positive flow state, the liquid inlet control valve connected to each of the first port and the second port is opened and the liquid outlet control valve is closed, and the liquid inlet control valve connected to each of the third port and the fourth port is closed and the liquid outlet control valve is opened; in the backflow state, the liquid inlet control valve connected to each of the first port and the second port is closed and the liquid outlet control valve is opened, and the liquid inlet control valve connected to each of the third port and the fourth port is opened and the liquid outlet control valve is closed.
In addition, the electrodialysis device includes a cross flow mode in which the flow direction of each flow path in the forward flow state is opposite and the flow direction of each flow path in the reverse flow state is opposite.
Furthermore, in the positive flow state, the liquid inlet control valve connected in parallel at each of the first interface and the fourth interface is closed and the liquid outlet control valve is opened, and the liquid inlet control valve connected in parallel at each of the second interface and the third interface is opened and the liquid outlet control valve is closed; in the backflow state, the liquid inlet control valves connected in parallel at the first interface and the fourth interface respectively are opened and the liquid outlet control valves are closed, and the liquid inlet control valves connected in parallel at the second interface and the third interface respectively are closed and the liquid outlet control valves are opened.
Further, the electrodialysis device also comprises an electric control device, and the electric control device can control the opening and closing of each liquid inlet control valve and each liquid outlet control valve.
Furthermore, the electric control device can receive a detection signal of the total amount of soluble solids in the liquid flowing out of each liquid outlet pipe section, and controls the liquid inlet control valves and the liquid outlet control valves to be opened and closed according to the detection signal; or, the electric control device can control the opening and closing of each liquid inlet control valve and each liquid outlet control valve according to set time.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic view of an electrodialysis unit according to an embodiment of the present invention;
fig. 2 is a schematic view of the forward flow regime of the electrodialysis unit of fig. 1 in co-current flow mode;
FIG. 3 is a schematic view of the reverse flow state of the electrodialysis unit of FIG. 2 in a co-current flow mode;
fig. 4 is a schematic view of the forward flow regime of the electrodialysis unit of fig. 1 in a cross flow mode;
fig. 5 is a schematic view of the reverse flow state of the electrodialysis unit of fig. 4 in a staggered flow mode.
Description of the reference numerals
1-a first interface, 2-a second interface, 3-a third interface, 4-a fourth interface, 5-an ionization filtration state, 6-a first liquid inlet main pipe section, 7-a first liquid inlet main control valve, 8-a second liquid inlet main pipe section, 9-a second liquid inlet main control valve, 11-a first liquid inlet control valve, 12-a first liquid outlet control valve, 13-a first interface pipe section, 21-a second liquid inlet control valve, 22-a second liquid outlet control valve, 23-a second interface pipe section, 31-a third liquid inlet control valve, 32-a third liquid outlet control valve, 33-a third interface pipe section, 41-a fourth liquid inlet control valve, 42-a fourth liquid outlet control valve, 43-a fourth interface pipe section, 121-a first TDS detection device, 221-a second TDS detection device. 321-third TDS detection device, 421-fourth TDS detection device.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In a first aspect, referring to fig. 1, the electrodialysis device provided by the present invention includes an ionization filter device 5, a liquid inlet pipe section and a liquid outlet pipe section, wherein the ionization filter device 5 includes a first connector 1 and a second connector 2 located on one side, and a third connector 3 and a fourth connector 4 located on the other side, each of the first connector 1, the second connector 2, the third connector 3 and the fourth connector 4 is connected with a connector pipe section, that is, the first connector 1 is connected with a first connector pipe section 13, the second connector 2 is connected with a second connector pipe section 23, the third connector 3 is connected with a third connector pipe section 33, the fourth connector 4 is connected with a fourth connector pipe section 43, each connector pipe section is connected in parallel with a liquid inlet pipe section and a liquid outlet pipe section, that is, the first connector pipe section 13 is connected in parallel with a first liquid inlet pipe section and a first liquid outlet pipe section, the second connector pipe section 23 is connected in parallel with a second liquid inlet pipe section and, the third interface pipe section 33 is connected in parallel with a third liquid inlet pipe section and a third liquid outlet pipe section, the fourth interface pipe section 43 is connected in parallel with a fourth liquid inlet pipe section and a fourth liquid outlet pipe section, each liquid inlet pipe section is provided with a liquid inlet control valve, each liquid outlet pipe section is provided with a liquid outlet control valve, namely, the first liquid inlet pipe section is provided with a first liquid inlet control valve 11, the first liquid outlet pipe section is provided with a first liquid outlet control valve 12, the second liquid inlet pipe section is provided with a second liquid inlet control valve 21, the second liquid outlet pipe section is provided with a second liquid outlet control valve 22, the third liquid inlet pipe section is provided with a third liquid inlet control valve 31, the third liquid outlet pipe section is provided with a third liquid outlet control valve 32, the fourth liquid inlet pipe section is provided with a fourth liquid inlet control valve 41, the fourth liquid outlet pipe section is provided with a fourth liquid outlet control valve 42, wherein, each liquid inlet control valve (the first liquid inlet control valve 11, the second liquid inlet control valve 21, the fourth liquid outlet control, Third liquid inlet control valve 31 and fourth liquid inlet control valve 41) and the respective liquid outlet control valves (first liquid outlet control valve 12, second liquid outlet control valve 22, third liquid outlet control valve 32, and fourth liquid outlet control valve 42) can be opened and closed so that a forward flow state and a reverse flow state in opposite directions can be formed in the ionization filter device 5.
In addition, the ionization and filtration device 5 includes an anion exchange membrane (cathode membrane), a cation exchange membrane (anode membrane), and positive and negative electrodes, the cathode membrane and the anode membrane being alternately arranged in sequence between the positive electrode and the negative electrode to form a plurality of compartments, and the first port 1, the second port 2, the third port 3, and the fourth port 4 are communicated with the respective compartments.
In the electrodialysis device, each interface is connected with an interface pipe section, each interface pipe section is connected with a liquid inlet pipe section and a liquid outlet pipe section in parallel, each liquid inlet pipe section is provided with a liquid inlet control valve, each liquid outlet pipe section is provided with a liquid outlet control valve, so that in actual use of the electrodialysis device, one part of the liquid inlet control valves can be controlled to open and the other part of the liquid inlet control valves can be controlled to close, and meanwhile, one part of the liquid outlet control valves can be controlled to open and the other part of the liquid outlet control valves can be controlled to close, so that liquid flowing in the ionization filtering device is in a positive flow state, and scales along the positive flow direction can be adhered to an ion exchange membrane, a water distribution network and the interface pipe sections of the electrodialysis. Then, one part of the liquid inlet control valve can be controlled to close and the other part of the liquid inlet control valve is controlled to open, and simultaneously one part of the liquid outlet control valve is controlled to close and the other part of the liquid outlet control valve is controlled to open, so that the liquid flow in the ionization filtering device is in a backflow state, the liquid flow direction in the backflow state is opposite to the liquid flow direction in the positive current state, and the liquid flow direction in the backflow state is opposite to the scale adhered in the positive current direction, therefore, the liquid flow in the backflow state can be reversely and continuously cut into the scouring scale to strip the scale, when the backflow state is switched to the positive current state, the liquid flow in the positive current state can be reversely and continuously cut into the scouring scale to strip the scale, and therefore, the surface scale in the electrodialysis device can be avoided or reduced, and meanwhile. Therefore, the electrodialysis device can prolong the service life of the ion exchange membrane, reduce the current loss and improve the desalination efficiency.
Of course, in the electrodialysis apparatus, in a first embodiment, a first liquid inlet pipe section, a second liquid inlet pipe section, a third liquid inlet pipe section and a fourth liquid inlet pipe section may be respectively used for connecting a liquid inlet source, or, in a second embodiment, the first liquid inlet pipe section and the second liquid inlet pipe section are connected in parallel to one liquid inlet header pipe section, and the third liquid inlet pipe section and the fourth liquid inlet pipe section are connected in parallel to another liquid inlet header pipe section, or, in a third embodiment, as shown in fig. 1, the liquid inlet pipe section connected with the first connector 1 and the liquid inlet pipe section connected with the third connector 3 are connected in parallel to the first liquid inlet header pipe section 6, and the first liquid inlet header pipe section 6 is provided with a first liquid inlet general control valve 7, that is, the first liquid inlet pipe section and the third liquid inlet pipe section are connected in parallel to the first liquid inlet header pipe. Thus, in this third embodiment, after the first liquid inlet total control valve 7 is opened, if the first liquid inlet control valve 11 is opened and the third liquid inlet control valve 31 is closed, the liquid inlet enters the ionization and filtration device 5 through the first port 1, the liquid outlet can flow out through the second liquid outlet control valve 22, the third liquid outlet control valve 32 or the fourth liquid outlet control valve 42, if the first liquid inlet control valve 11 is closed and the third liquid inlet control valve 31 is opened, the liquid inlet enters the ionization and filtration device 5 through the second port 2, and the liquid outlet can flow out through the first liquid outlet control valve 12, the second liquid outlet control valve 22 or the fourth liquid outlet control valve 42.
In addition, in the fourth embodiment, as shown in fig. 1, the liquid inlet pipe section connected with the second port 2 and the liquid inlet pipe section connected with the fourth port 4 are connected in parallel to the second liquid inlet main pipe section 8, and a second liquid inlet total control valve 9 is arranged on the second liquid inlet main pipe section 8, that is, the second liquid inlet pipe section and the fourth liquid inlet pipe section are connected in parallel to the second liquid inlet main pipe section 8. Thus, in the fourth embodiment, after the second liquid inlet total control valve 9 is opened, if the second liquid inlet control valve 21 is opened and the fourth liquid inlet control valve 41 is closed, the liquid inlet enters the ionization and filtration device 5 through the second port 2, the liquid outlet can flow out through the first liquid outlet control valve 12, the third liquid outlet control valve 32 or the fourth liquid outlet control valve 42, if the second liquid inlet control valve 21 is closed and the fourth liquid inlet control valve 41 is opened, the liquid inlet enters the ionization and filtration device 5 through the fourth port 2, and the liquid outlet can flow out through the first liquid outlet control valve 12, the second liquid outlet control valve 22 or the third liquid outlet control valve 32.
In addition, the liquid inlet control valve and the liquid outlet control valve of the electrodialysis device can be opened and closed by an operator, or can be automatically opened and closed after running for a certain period of time, or can be determined according to the fixed total solubility (TDS) of the outlet liquid such as the outlet water, that is, the fixed total solubility of the outlet water is detected in real time, and when the fixed total solubility reaches a set value, an alarm can be sent to the operator to enable the operator to operate, or a detection signal is sent to the electric control device, so that the electric control device controls the opening and closing of each liquid inlet control valve and each liquid outlet control valve according to the received detection signal.
Therefore, in an embodiment, as shown in fig. 1, along the liquid outlet direction, each liquid outlet pipe segment is provided with a TDS detection device located downstream of the liquid outlet control valve, that is, a first TDS detection device 121 located downstream of the first liquid outlet control valve 12 is provided on the first liquid outlet pipe segment to detect TDS of the liquid outlet of the first liquid outlet pipe segment, a second TDS detection device 221 located downstream of the second liquid outlet control valve 22 is provided on the second liquid outlet pipe segment to detect TDS of the liquid outlet of the second liquid outlet pipe segment, a third TDS detection device 321 located downstream of the third liquid outlet control valve 32 is provided on the third liquid outlet pipe segment to detect TDS of the liquid outlet of the third liquid outlet pipe segment, and a fourth TDS detection device 421 located downstream of the fourth liquid outlet control valve 42 is provided on the fourth liquid outlet pipe segment to detect TDS of the liquid outlet of the fourth liquid outlet pipe segment. Therefore, as mentioned above, when each liquid outlet pipe section is discharging liquid, the TDS detection device on the liquid outlet pipe section in the liquid discharging state can detect the TDS of the discharged liquid in real time, and when the fixed total solubility amount reaches a set value, the TDS detection device can give an alarm to an operator to enable the operator to operate, or send a detection signal to the electric control device, so that the electric control device controls the opening and closing of each liquid inlet control valve and each liquid outlet control valve according to the received detection signal, and the electrodialysis device is switched between the forward flow state and the reverse flow state.
In addition, referring to fig. 2 and 3, the electrodialysis device includes a cocurrent flow mode in which the flow direction of each flow path in a forward flow state is the same and the flow direction of each flow path in a reverse flow state is the same. The flow path formed between the first port 1 and the third port 3 and the flow path formed between the second port 2 and the fourth port 4 have the same flow direction depending on the arrangement position of the positive and negative electrodes and the ion exchange membrane in the electrodialysis device. Alternatively, the flow path formed between the first port 1 and the second port 2 is in the same flow direction as the flow path formed between the third port 3 and the fourth port 4.
For example, in one embodiment, as shown in fig. 2, in a forward flow state, the inlet control valve connected to each of the first port 1 and the second port 2 is opened and the outlet control valve is closed, the inlet control valve connected to each of the third port 3 and the fourth port 4 is closed and the outlet control valve is opened, that is, the first inlet control valve 11 and the second inlet control valve 21 are opened, the second outlet control valve 12 and the second outlet control valve 22 are closed, the third inlet control valve 31 and the fourth inlet control valve 41 are closed, the third outlet control valve 32 and the fourth outlet control valve 42 are opened, so that the inlet liquid in the first inlet manifold section 6 enters the ionization filtering device 5 through the first inlet control valve 11 and the first port 1, and after ionization (for example, fresh water) is discharged through the third port 3 and the third outlet control valve 32, the inlet liquid in the second inlet manifold section 8 enters the ionization filtering device 5 through the second inlet control valve 21 and the second port 2, the liquid (for example, the concentrated water) is discharged from the fourth port 4 and the fourth liquid outlet control valve 42, and at this time, the liquid inlet in the first liquid inlet header section 6 and the liquid inlet in the second liquid inlet header section 8 may be the same or different. In the reverse flow state, as shown in fig. 3, the liquid inlet control valve connected to each of the first connection port 1 and the second connection port 2 is closed and the liquid outlet control valve is opened, the liquid inlet control valve connected to each of the third connection port 3 and the fourth connection port 4 is opened and the liquid outlet control valve is closed, that is, the first liquid inlet control valve 11 and the second liquid inlet control valve 21 are closed, the second liquid outlet control valve 12 and the second liquid outlet control valve 22 are opened, the third liquid inlet control valve 31 and the fourth liquid inlet control valve 41 are opened, the third liquid outlet control valve 32 and the fourth liquid outlet control valve 42 are closed, so that the feed liquid in the first feed liquid main pipe section 6 enters the ionization and filtration device 5 through the third liquid inlet control valve 31 and the third connection port 3, and is discharged (for example, fresh water) through the first connection port 1 and the first liquid outlet control valve 12, and the feed liquid in the second feed liquid main pipe section 8 enters the ionization and filtration device 5 through the fourth liquid inlet control valve 41 and the fourth connection port 4, the liquid (for example, the concentrated water) is discharged from the second connector 2 and the second liquid outlet control valve 22, and at this time, the liquid inlet in the first liquid inlet header section 6 and the liquid inlet in the second liquid inlet header section 8 may be the same or different. Thus, as described above, by switching the flow direction between the forward flow state and the reverse flow state, the liquid flow will be cut back and forth to wash out the scale to peel off the scale, so that the surface scale in the electrodialysis device can be avoided or reduced, and the interface section can be cleaned at the same time. Therefore, the electrodialysis device can prolong the service life of the ion exchange membrane, reduce the current loss and improve the desalination efficiency.
In addition, the electrodialysis device comprises a staggered flow mode, in the staggered flow mode, the flow direction of each flow path in a positive flow state is opposite, and the flow direction of each flow path in a reverse flow state is opposite, so that the flow direction of each flow path in the ionization filtering device 5 is opposite no matter in the positive flow state or the reverse flow state, therefore, the scaling of the surface of the membrane can be further reduced, the service life of the ion exchange membrane is prolonged, and the desalination efficiency is improved. The flow path formed between the first port 1 and the third port 3 and the flow path formed between the second port 2 and the fourth port 4 have opposite flow directions to form a cross flow depending on the arrangement positions of the positive and negative electrodes and the ion exchange membrane in the electrodialysis device. Alternatively, the flow path formed between the first port 1 and the second port 2 and the flow path formed between the third port 3 and the fourth port 4 are in opposite directions to form a cross flow. For example, in one embodiment, as shown in fig. 4, in a forward flow state, the liquid inlet control valve connected in parallel at the first connection port 1 and the fourth connection port 4 is closed and the liquid outlet control valve is opened, the liquid inlet control valve connected in parallel at the second connection port 2 and the third connection port 3 is opened and the liquid outlet control valve is closed, that is, the first liquid inlet control valve 11 and the fourth liquid inlet control valve 41 are closed, the second liquid inlet control valve 21 and the third liquid inlet control valve 31 are opened, the first liquid outlet control valve 12 and the fourth liquid outlet control valve 42 are opened, the second liquid outlet control valve 22 and the third liquid outlet control valve 32 are closed, so that the inlet liquid in the first inlet manifold section 6 enters the ionization filtering device 5 through the third liquid inlet control valve 31 and the third connection port 3, and is discharged after ionization (for example, fresh water) through the first connection port 1 and the first liquid outlet control valve 12, the inlet liquid in the second inlet manifold section 8 enters the ionization filtering device 5 through the second liquid inlet control valve 21 and the second connection port 2, the liquid (such as concentrated water) is discharged from the fourth connector 4 and the fourth liquid outlet control valve 42, and at this time, the liquid inlet in the first liquid inlet main pipe section 6 and the liquid inlet in the second liquid inlet main pipe section 8 can be the same or different; in the reverse flow state, as shown in fig. 5, the liquid inlet control valve connected in parallel at the first port 1 and the fourth port 4 is opened and the liquid outlet control valve is closed, the liquid inlet control valve connected in parallel at the second port 2 and the third port 3 is closed and the liquid outlet control valve is opened, that is, the first liquid inlet control valve 11 and the fourth liquid inlet control valve 41 are opened, the second liquid inlet control valve 21 and the third liquid inlet control valve 31 are closed, the second liquid outlet control valve 12 and the fourth liquid outlet control valve 42 are closed, the second liquid outlet control valve 22 and the third liquid outlet control valve 32 are opened, so that the inlet liquid in the first inlet pipe section 6 enters the ionization filtering device 5 through the first inlet control valve 11 and the first port 1, and is discharged after ionization (for example, fresh water) through the third port 3 and the third liquid outlet control valve 32, the inlet liquid in the second inlet pipe section 8 enters the ionization filtering device 5 through the fourth liquid inlet control valve 41 and the fourth port 4, the liquid (for example, the concentrated water) is discharged from the second connector 2 and the second liquid outlet control valve 22, and at this time, the liquid inlet in the first liquid inlet header section 6 and the liquid inlet in the second liquid inlet header section 8 may be the same or different.
In addition, the electrodialysis device further comprises an electric control device (not shown in the figure), and the electric control device can control the opening and closing of each liquid inlet control valve and each liquid outlet control valve so as to realize the switching between the forward flow state and the reverse flow state. For example, after the operation reaches a certain period of time, the electronic control device can control each liquid inlet control valve and each liquid outlet control valve to automatically open and close so as to realize the switching between the positive flow state and the reverse flow state.
In addition, the electric control device can receive detection signals of the total amount of soluble solids in the liquid flowing out of each liquid outlet pipe section, and controls the liquid inlet control valves and the liquid outlet control valves to be opened and closed according to the detection signals. That is, the fixed total amount of solubility in water is detected in real time and a detection signal is sent to the electric control device, and when the detection signal of the fixed total amount of solubility received by the electric control device reaches a set value, the electric control device controls the liquid inlet control valve and the liquid outlet control valve to be opened and closed so as to realize the switching between the forward flow state and the reverse flow state.
Or, the electric control device can control the opening and closing of each liquid inlet control valve and each liquid outlet control valve according to the set time, for example, the opening time and the closing time of each liquid inlet control valve and each liquid outlet control valve can be set by the electric control device, and when the set time is reached, the electric control device controls the opening and closing of each liquid inlet control valve and each liquid outlet control valve to realize the switching between the forward flow state and the reverse flow state.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (10)
1. An electrodialysis device is characterized by comprising an ionization filtering device (5), a liquid inlet pipe section and a liquid outlet pipe section, wherein the ionization filter device (5) comprises a first interface (1) and a second interface (2) on one side and a third interface (3) and a fourth interface (4) on the other side, each interface of the first interface (1), the second interface (2), the third interface (3) and the fourth interface (4) is connected with an interface pipe section, each interface pipe section is connected with a liquid inlet pipe section and a liquid outlet pipe section in parallel, each liquid inlet pipe section is provided with a liquid inlet control valve, each liquid outlet pipe section is provided with a liquid outlet control valve, wherein each of the liquid inlet control valves and each of the liquid outlet control valves can be opened and closed so that a positive flow state and a reverse flow state in opposite directions can be formed in the ionization filter device (5).
2. Electrodialysis unit according to claim 1, characterized in that the inlet pipe section connected to the first port (1) and the inlet pipe section connected to the third port (3) are connected in parallel to a first inlet manifold section (6), and a first inlet manifold control valve (7) is arranged on the first inlet manifold section (6).
3. Electrodialysis device according to claim 1, wherein the liquid inlet pipe section connected to the second port (2) and the liquid inlet pipe section connected to the fourth port (4) are connected in parallel to a second liquid inlet header pipe section (8), and a second liquid inlet total control valve (9) is arranged on the second liquid inlet header pipe section (8).
4. Electrodialysis unit according to claim 1, characterized in that in the tapping direction, each tapping section is provided with a TDS detection device downstream of the tapping control valve.
5. Electrodialysis unit according to any one of claims 1-4, characterized in that the electrodialysis unit comprises a co-current mode, in which the flow direction of the flow paths in the forward flow state is the same and the flow direction of the flow paths in the reverse flow state is the same.
6. Electrodialysis unit according to claim 5, characterized in that in the positive flow state, the inlet control valve connected at each of the first and second connections (1, 2) is open and the outlet control valve is closed, the inlet control valve connected at each of the third and fourth connections (3, 4) is closed and the outlet control valve is open;
in the backflow state, the liquid inlet control valve connected to each of the first port (1) and the second port (2) is closed and the liquid outlet control valve is opened, and the liquid inlet control valve connected to each of the third port (3) and the fourth port (4) is opened and the liquid outlet control valve is closed.
7. Electrodialysis unit according to any one of claims 1-4, characterized in that the electrodialysis unit comprises a staggered flow mode, in which the flow directions of the flow paths in the forward flow state are opposite and the flow directions of the flow paths in the reverse flow state are opposite.
8. Electrodialysis unit according to claim 7, wherein in the positive flow state, the inlet control valve in parallel at the first interface (1) and the fourth interface (4) is closed and the outlet control valve is open, the inlet control valve in parallel at the second interface (2) and the third interface (3) is open and the outlet control valve is closed;
in the backflow state, the liquid inlet control valves connected in parallel at the first interface (1) and the fourth interface (4) are opened and the liquid outlet control valves are closed, the liquid inlet control valves connected in parallel at the second interface (2) and the third interface (3) are closed and the liquid outlet control valves are opened.
9. The electrodialysis unit according to claim 1, further comprising an electrical control device capable of controlling the opening and closing of each of the liquid inlet control valves and each of the liquid outlet control valves.
10. Electrodialysis unit according to claim 9, wherein the electrical control means is capable of receiving a detection signal of the total amount of soluble solids in the liquid exiting from each of the outlet sections and controlling the opening and closing of each of the inlet control valves and each of the outlet control valves according to the detection signal;
alternatively, the first and second electrodes may be,
the electric control device can control the opening and closing of each liquid inlet control valve and each liquid outlet control valve according to set time.
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