CN211896193U - Electrodialyzer with high desalination rate - Google Patents
Electrodialyzer with high desalination rate Download PDFInfo
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- CN211896193U CN211896193U CN201922477730.1U CN201922477730U CN211896193U CN 211896193 U CN211896193 U CN 211896193U CN 201922477730 U CN201922477730 U CN 201922477730U CN 211896193 U CN211896193 U CN 211896193U
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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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Abstract
The utility model discloses an electrodialyzer of high salt rejection is provided with membrane stack, positive plate electrode, negative plate electrode, upper cover plate and apron down, positive plate electrode and negative plate electrode compress tightly in the membrane stack both sides, upper cover plate, lower apron compress tightly in positive plate electrode, negative plate electrode both sides, membrane stack transverse arrangement is provided with the multistage membrane, the pressure difference osmotic coefficient of the water of back N section ion exchange membrane is less than the pressure difference osmotic coefficient of the water of preceding M section ion exchange membrane, M is greater than or equal to 1, N is greater than or equal to 1. By using ion exchange membranes with different water pressure difference permeability coefficients in different sections of the electrodialysis membrane stack, when the pressure of a dense chamber water channel is less than that of a dilute chamber water channel, the membrane section uses a high-water pressure difference permeability coefficient ion exchange membrane; when the pressure of the water channel of the dense chamber is greater than that of the water channel of the dilute chamber, the membrane section uses a low-water differential pressure permeability coefficient ion exchange membrane. The method can prevent the water in the water channel of the dense chamber from leaking into the water channel of the dilute chamber to pollute the fresh water, improve the desalting effect and solve the problem that the desalting rate of the membrane stack does not reach the standard.
Description
Technical Field
The utility model relates to an electrodialysis water purification field especially relates to an electrodialyzer of high desalination.
Background
The type of assembly of electrodialysers is generally indicated by the "stages" and "segments", the stack of membranes between a pair of electrodes being called "stage one", the plurality of membranes with the same direction of water flow being called "segment one". Increasing the number of stages is equal to increasing the length of the desalting process, so that the desalting effect is improved; the number of membrane pairs is increased, and the treatment capacity of raw water can be improved. The assembling mode of the electrodialyzer can also be adjusted according to different requirements of fresh water yield and effluent quality, and the assembling mode comprises the following steps: one stage, multiple stages, etc. The electrodialysis treater multistage membrane is favorable to improving the desalination effect, but the position of membrane section along the rivers direction is backward, and the salt concentration of fresh room water is lower, and the salt concentration of dense room water is higher, and when reaching certain degree, the water pressure of dense room runner is greater than the water pressure of fresh room runner far away, and at this moment, the water of dense room runner can permeate into fresh room under pressure drive for fresh room salt concentration sharply rises, and the membrane stack desalination descends by a wide margin, often can not reach the desalination requirement, for example more than 85% desalination.
Therefore, it is necessary to overcome the deficiencies of the prior art by providing an electrodialyzer with high salt rejection using ion exchange membranes with different water differential pressure permeability coefficients.
Disclosure of Invention
An object of the utility model is to avoid prior art's weak point and provide an electrodialyzer of high desalination, according to the quality of water condition, change the membrane stack at the same level for the ordinary ion exchange membrane of the rearmounted membrane section of rivers direction for low ion exchange membrane that permeates water, prevented that the rearmounted membrane from piling dense room runner strong brine to the leakage of light room runner, improved the desalination effect of membrane stack.
The purpose of the utility model is realized through the following technical measures.
The electrodialyzer with high desalination rate is provided with a membrane stack, an anode plate electrode, a cathode plate electrode, an upper cover plate and a lower cover plate, wherein the anode plate electrode and the cathode plate electrode are tightly pressed on two sides of the membrane stack, the upper cover plate and the lower cover plate are tightly pressed on two sides of the anode plate electrode and the cathode plate electrode, the membrane stack is transversely provided with a plurality of sections of membranes, the differential pressure permeability coefficient of water of a rear N section of ion exchange membrane is lower than that of water of a front M section of ion exchange membrane, M is not less than 1, and N is not less than 1.
Preferably, M is 3. ltoreq. M.ltoreq.100 and N is 1. ltoreq. N.ltoreq.30.
Preferably, the lowest water differential pressure permeability coefficient in the back N section ion exchange membrane is 5 to 40 percent of the highest water differential pressure permeability coefficient in the front M section ion exchange membrane.
Preferably, each membrane section is provided with a plurality of membrane pairs, each membrane pair is provided with an anion exchange membrane and a cation exchange membrane and a partition plate, and the anion exchange membrane and the cation exchange membrane and the partition plate are alternately arranged in each membrane section.
Preferably, a plurality of stages of films are arranged in the longitudinal direction between the positive electrode and the negative electrode.
Preferably, a multi-stage membrane stack is provided, which is arranged transversely or longitudinally.
Preferably, any two adjacent membrane stacks arranged transversely share one positive electrode plate or one negative electrode plate.
Preferably, the upper cover plate and the lower cover plate are respectively provided with a screw hole, and the upper cover plate and the lower cover plate are connected through screws.
Preferably, each section of membrane is provided with a plurality of clapboards, and a plurality of clapboards match the laminating with a plurality of membrane pairs, and anion exchange membrane and cation exchange membrane laminate in the baffle both sides.
Preferably, the baffle is provided with supporting network and sealed limit, and the sealed limit surrounds to connect around the supporting network, and the sealed limit width is 5 ~ 20 mm.
The utility model discloses an electrodialyzer of high salt rejection is provided with membrane stack, positive plate electrode, negative plate electrode, upper cover plate and apron down, positive plate electrode and negative plate electrode compress tightly in the membrane stack both sides, upper cover plate, lower apron compress tightly in positive plate electrode, negative plate electrode both sides, membrane stack transverse arrangement is provided with the multistage membrane, the pressure difference osmotic coefficient of the water of back N section ion exchange membrane is less than the pressure difference osmotic coefficient of the water of preceding M section ion exchange membrane, M is greater than or equal to 1, N is greater than or equal to 1. By using ion exchange membranes with different water pressure difference permeability coefficients in different sections of the electrodialysis membrane stack, when the pressure of a dense chamber water channel is less than that of a dilute chamber water channel, the membrane section uses a high-water pressure difference permeability coefficient ion exchange membrane; when the pressure of the water channel of the dense chamber is greater than that of the water channel of the dilute chamber, the membrane section uses a low-water differential pressure permeability coefficient ion exchange membrane. The method can prevent the water in the water channel of the dense chamber from leaking into the water channel of the dilute chamber to pollute the fresh water, improve the desalting effect and solve the problem that the desalting rate of the membrane stack does not reach the standard.
Drawings
The present invention will be further described with reference to the accompanying drawings, but the contents in the drawings do not constitute any limitation to the present invention.
Fig. 1 is a schematic structural view of a membrane stack according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of the structure of the membrane segment of the present invention.
Fig. 3 is a schematic structural view of a membrane stack according to embodiment 2 of the present invention.
Fig. 4 is a schematic diagram of a transverse arrangement structure of a multi-stage membrane stack according to embodiment 3 of the present invention.
Fig. 5 is a schematic view of a longitudinal arrangement structure of a multistage membrane stack according to embodiment 3 of the present invention.
Fig. 6 is a schematic structural view of a membrane stack according to embodiment 4 of the present invention.
In fig. 1 to 6, there are included:
100 parts of high water differential pressure permeability coefficient ion exchange membrane, 200 parts of low water differential pressure permeability coefficient ion exchange membrane, 300 parts of anion exchange membrane, 400 parts of cation exchange membrane,
A dilute chamber flow channel 500, a dense chamber flow channel 600, a positive electrode plate 700 and a negative electrode plate 800.
Detailed Description
The present invention will be further illustrated with reference to the following examples.
Example 1.
An electrodialyzer with high desalination rate is provided with a membrane stack, a positive electrode plate 700, a negative electrode plate 800, an upper cover plate and a lower cover plate, wherein the positive electrode plate 700 and the negative electrode plate 800 are tightly pressed on two sides of the membrane stack, the upper cover plate and the lower cover plate are tightly pressed on two sides of the positive electrode plate 700 and the negative electrode plate 800, the membrane stack is transversely provided with a plurality of sections of membranes, the differential pressure permeability coefficient of water of a back N section of ion exchange membrane is lower than that of water of a front M section of ion exchange membrane, M is larger than or equal to 1, and N is larger than or equal to 1. The ion exchange membrane 100 has a good differential pressure permeability coefficient of water, when the pressure of the dilute chamber channel 500 is greater than that of the concentrated water channel, pure water can permeate into the concentrated chamber channel 600, so that the electrodialytic pure cost ratio is reduced, but the desalination rate of produced water is not affected, when the pressure of the concentrated chamber channel 600 is greater than that of the dilute chamber channel 500, concentrated water can permeate into the dilute chamber channel 500, so that the desalination rate of produced water of the electrodialyser cannot reach the standard, therefore, the membrane with a low differential pressure permeability coefficient of water is used for replacing a common membrane for the N-section membrane after membrane stacking, the permeation amount of concentrated water into the dilute chamber channel 500 is reduced, and the desalination amount of produced water of the electrodialyser is ensured. The membrane stack is provided with a plurality of sections of membranes, so that the electrodialysis times of water flow are increased, and the produced water desalting rate obtained by the electrodialyzer is higher. In this embodiment, two membranes are taken as an example, the first membrane is a high water pressure difference permeability coefficient ion exchange membrane 100, and the second membrane is a low water pressure difference permeability coefficient ion exchange membrane 200. According to the standard T166.1-2013 of the ion exchange membrane industry: differential pressure permeability coefficient of water (mL/cm2.h.mpa) for type I electrodriven membranes the universal male and female membranes are not standard, but low permeability male and female membranes need to be < 0.05. The low-permeability positive film and the low-permeability negative film are mainly applied to EDI, salt concentration, electrophoretic coating, fine chemical engineering and the like.
In this embodiment, the lowest differential pressure permeability coefficient of water in the rear N-stage ion exchange membrane is 5% to 40% of the highest differential pressure permeability coefficient of water in the front M-stage ion exchange membrane. The ratio can be specifically set according to the actual quality of the raw water to be purified.
In this embodiment, each membrane stage is provided with a plurality of membrane pairs, each membrane pair is provided with an anion exchange membrane 300 and a cation exchange membrane 400 and a separator, and the anion exchange membrane 300 and the cation exchange membrane 400 and the separator are alternately arranged in each membrane stage. In this embodiment, two membrane pairs are provided in each membrane stage, and the larger the number of membrane pairs contained in each membrane stage is, the larger the purified water amount of the electrodialyzer is. A plurality of membrane pairs are arranged to form a membrane section, and the anion exchange membrane 300 and the cation exchange membrane 400 corresponding to two adjacent membrane pairs form a new water chamber.
In this embodiment, the upper cover plate and the lower cover plate are respectively provided with a screw hole, and the upper cover plate and the lower cover plate are connected through a screw. The tightness of the membrane stack is formed by the flatness and the elastic compression matching of the membrane and the partition plate, and leakage can be caused by slight unevenness or foreign matters between layers. The key of the water leakage of the membrane stack is to ensure that the upper and lower pressing plates of the membrane stack and the cover plate tightened by the bolt are kept completely flat under long-time high pressure, and the reinforced membrane stack usually needs to use steel plates with the thickness of more than 10mm as the upper and lower cover plates. In addition, other modes can be adopted, so that rigid plastics can be used as the cover plate under the condition that the stress of the cover plate is more uniform, such as PC, POM, PP + glass fiber, PPO, glass fiber reinforced plastic, acrylic or carbon fiber plates and the like.
In this embodiment, each membrane section is provided with a plurality of separators, the separators are matched and attached to the membrane pairs, and the anion exchange membrane 300 and the cation exchange membrane 400 are attached to two sides of the separators. The baffle is provided with supporting network and sealed limit, and the sealed limit surrounds to be connected around the supporting network, and the sealed limit width is 8 ~ 20 mm. The partition plate is positioned between the anion exchange membrane 300 and the cation exchange membrane 400, so that a water chamber is formed between the anion exchange membrane 400 and the cation exchange membrane 400, the support net plays a role in supporting the two membranes to obtain a water chamber space, and the sealing edge plays a role in sealing the water chamber. It should be noted that the sealing edge and the ion exchange membrane are both provided with a water inlet and a water outlet to ensure that water flows through the water chamber.
The electrodialyzer with high desalination rate uses ion exchange membranes with different water pressure difference permeability coefficients in different sections of an electrodialyzer membrane stack, and when the pressure of a dense chamber water channel is smaller than that of a dilute chamber water channel, the membrane section uses a high water pressure difference permeability coefficient ion exchange membrane 100; when the pressure of the water channel of the dense chamber is larger than that of the water channel of the dilute chamber, the membrane section uses the ion exchange membrane 200 with low water differential pressure permeability coefficient. The method can prevent the water in the water channel of the dense chamber from leaking into the water channel of the dilute chamber to pollute the fresh water, improve the desalting effect and solve the problem that the desalting rate of the membrane stack does not reach the standard.
Example 2.
An electrodialyzer with high salt rejection, as shown in FIG. 3, has the same other features as those of example 1 except that: m is more than or equal to 3 and less than or equal to 100, and N is more than or equal to 1 and less than or equal to 30. The specific settings of M and N are specifically adjusted according to the actual purified water source. And a plurality of sections of membranes are longitudinally arranged between the positive electrode and the negative electrode. The multi-section membranes are longitudinally arranged, the ion exchange membrane 200 with the low water differential pressure permeability coefficient is used in the back N section, the desalination rate of the electrodialyzer is ensured, meanwhile, the thickness of the membrane stack can be reduced, the pressure of the membrane stack is reduced, and the complexity of a water channel of the electrodialyzer can also be reduced.
Example 3.
An electrodialyzer with high salt rejection, as shown in FIG. 4 or FIG. 5, has the same other features as those of example 1 except that: is provided with a plurality of film stacks which are transversely arranged or longitudinally arranged. The present embodiment is exemplified by two stages. A plurality of stages of membrane stacks are arranged in an electrodialyzer, and N sections of membranes behind the membrane sections of each stage of membrane stack use low-water differential pressure permeability coefficient ion exchange membranes 200, so that the desalting rate of the electrodialyzer is ensured. In addition, the multi-stage membrane pairs are simultaneously arranged in one electrodialyzer, so that the water purification amount of the electrodialyzer can be greatly improved.
Example 4.
An electrodialyzer with high salt rejection, as shown in FIG. 6, has the same other features as those of example 1 except that: any two adjacent membrane stacks arranged in the transverse direction share one positive electrode plate 700 or one negative electrode plate 800. In this embodiment, two adjacent membrane stacks share one positive electrode plate 700. The N sections of membranes behind the membrane section of each stage of membrane stack use the low-water differential pressure permeability coefficient ion exchange membrane 200, thus ensuring the desalination rate of the electrodialyzer and being beneficial to improving the water purification amount of the multistage membrane stack. In addition, the common electrode plate also saves the manufacturing cost of the electrodialyzer.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. An electrodialyser of high salt rejection, characterized by: the device is provided with a membrane stack, a positive electrode, a negative electrode, an upper cover plate and a lower cover plate, wherein the positive electrode and the negative electrode are tightly pressed on two sides of the membrane stack, and the upper cover plate and the lower cover plate are tightly pressed on two sides of the positive electrode and the negative electrode;
the membrane stack is transversely provided with a plurality of sections of membranes, the differential pressure permeability coefficient of water of the back N sections of ion exchange membranes is lower than that of water of the front M sections of ion exchange membranes, M is larger than or equal to 1, and N is larger than or equal to 1.
2. The electrodialyser of high salt rejection according to claim 1, wherein: m is more than or equal to 3 and less than or equal to 100, and N is more than or equal to 1 and less than or equal to 30.
3. The electrodialyser of high salt rejection according to claim 1 or 2, characterized in that: the lowest water pressure difference permeability coefficient in the back N section of ion exchange membrane is 5 to 40 percent of the highest water pressure difference permeability coefficient in the front M section of ion exchange membrane.
4. The electrodialyser of high salt rejection according to claim 3, wherein: each section of membrane is provided with a plurality of membrane pairs, each membrane pair is provided with an anion exchange membrane, a cation exchange membrane and a clapboard, and the anion exchange membrane, the cation exchange membrane and the clapboard are alternately arranged in each section of membrane.
5. The electrodialyser of high salt rejection according to claim 3, wherein: and a plurality of sections of membranes are longitudinally arranged between the positive electrode and the negative electrode.
6. The electrodialyser of high salt rejection according to claim 3, wherein: is provided with a plurality of film stacks which are transversely arranged or longitudinally arranged.
7. The electrodialyser of high salt rejection according to claim 6, wherein: any two adjacent membrane stacks arranged transversely share one positive electrode or one negative electrode.
8. The electrodialyser of high salt rejection according to claim 3, wherein: the upper cover plate and the lower cover plate are respectively provided with a screw hole, and the upper cover plate is connected with the lower cover plate through a screw.
9. The electrodialyser of high salt rejection according to claim 4, wherein: every section membrane is provided with a plurality of baffles, and a plurality of baffles match the laminating with a plurality of membrane pairs, and anion exchange membrane and cation exchange membrane laminate in the baffle both sides.
10. The electrodialyser of high salt rejection according to claim 4, wherein: the baffle is provided with supporting network and sealed limit, and the sealed limit surrounds to be connected around the supporting network, and the sealed limit width is 5 ~ 20 mm.
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| CN201922477730.1U CN211896193U (en) | 2019-12-31 | 2019-12-31 | Electrodialyzer with high desalination rate |
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| CN201922477730.1U CN211896193U (en) | 2019-12-31 | 2019-12-31 | Electrodialyzer with high desalination rate |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114149058A (en) * | 2020-12-10 | 2022-03-08 | 佛山市美的清湖净水设备有限公司 | Membrane stack for water purification unit and water purification unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114149058A (en) * | 2020-12-10 | 2022-03-08 | 佛山市美的清湖净水设备有限公司 | Membrane stack for water purification unit and water purification unit |
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Effective date of registration: 20211026 Address after: 528308 No.2, North Xinxi 4th Road, Xiashi village, Lunjiao street, Shunde District, Foshan City, Guangdong Province Patentee after: Guangdong Chestnut Technology Co.,Ltd. Address before: 528300 Nepheline Village Committee, Lunjiao Sub-district Office, Shunde District, Foshan City, Guangdong Province Patentee before: FOSHAN VIOMI ELECTRICAL TECHNOLOGY Co.,Ltd. Patentee before: Chen Xiaoping |