CN106474927B - Large-flux roll-type EDI assembly, assembly method thereof and desalination method - Google Patents

Large-flux roll-type EDI assembly, assembly method thereof and desalination method Download PDF

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CN106474927B
CN106474927B CN201611197806.XA CN201611197806A CN106474927B CN 106474927 B CN106474927 B CN 106474927B CN 201611197806 A CN201611197806 A CN 201611197806A CN 106474927 B CN106474927 B CN 106474927B
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membrane
core
sealing
shell
cover plate
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CN106474927A (en
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李光辉
吴建平
梁红波
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Zhejiang Cathayripe Environmental Engineering Co ltd
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • 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
    • 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
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Supply & Treatment (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Urology & Nephrology (AREA)
  • Analytical Chemistry (AREA)
  • Molecular Biology (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention relates to the field of water treatment equipment, in particular to a large-flux roll-type EDI component, an assembly method and a desalination method thereof. A large-throughput roll-to-roll EDI component, comprising: the sealing structure comprises a shell and a membrane core, wherein the shell comprises a shell body, sealing sleeves and a cover plate, the sealing sleeves and the cover plate form a group of sealing structures, two ends of the shell body are respectively provided with a group of sealing structures, and the sealing sleeves are arranged between the cover plate and the end part of the shell body; the membrane core comprises a core body and an end cover, the core body is arranged in the outer shell, and the end cover is sleeved in the connecting part of the sealing sleeve and the outer shell; the sealing sleeve and the end part of the outer shell are provided with first sealing rings, a second sealing ring is arranged between the sealing sleeve and the cover plate, and a third sealing ring is arranged between the sealing sleeve and the end cover.

Description

Large-flux roll-type EDI assembly, assembly method thereof and desalination method
Technical Field
The invention relates to the field of water treatment equipment, in particular to a large-flux roll-type EDI component, an assembly method and a desalination method thereof.
Background
At present, the EDI electric desalting device mainly comprises a plate type EDI and a roll type EDI. The traditional roll type EDI is mainly sealed by a top cover and a bottom cover, and the standard flow of a single membrane component is 2m 3 About/h, the water outlet pipe is large in occupied area, low in space utilization rate and high in water cost per ton when being installed and used under the same water outlet requirement, and meanwhile, a press machine is needed to assemble when the film cores are installed, and the production operation requirement is high.
Compared with the traditional plate-frame EDI, the roll-type EDI has concentric electric field distribution, higher current efficiency and lower power consumption; the dense and fresh water flow state design of the roll-type EDI is different from the same-direction flow design of the traditional plate-frame EDI, and the factors causing scaling can be better eliminated. Meanwhile, the structural design of the roll-type EDI creates a concentrated water flow channel unit and a fresh water flow channel unit from outside to inside, different resins can be configured in the same EDI component according to the water quality condition, the desalting efficiency can be improved, and the energy consumption for removing ions can be effectively reduced.
However, the roll-type EDI is formed by rolling a plurality of pairs of anion and cation exchange membranes into a cylindrical membrane stack, then filling ion exchange resins in a concentrated water flow channel and a fresh water flow channel respectively, and finally sealing the membrane stack by adding a lower end cover. However, in the whole cylindrical membrane stack, the water swelling properties of the ion exchange membrane and the ion exchange resin at each point in the circumferential axial direction and the longitudinal direction are different, and the difference is related to the materials of the ion exchange membrane and the ion exchange resin and the accuracy of the roll-type EDI assembly process. The direct result of this difference is water leakage of the rolled EDI module and the series flow of the concentrated and fresh water inside the module, which seriously affects the desalination effect of the module until the whole module is scrapped. Therefore, there is a need in the art for a roll-to-roll EDI module product that has a large throughput (throughput) of a single module and can operate reliably for long periods of time.
Disclosure of Invention
The invention aims to solve the problems in the background art and provides a large-flux roll-type EDI component, an assembling method and a desalting method thereof.
The technical purpose of the invention is realized by the following technical scheme:
a large-flux rolled EDI component comprising: the sealing structure comprises a shell and a membrane core, wherein the shell comprises a shell body, sealing sleeves and a cover plate, the sealing sleeves and the cover plate form a group of sealing structures, two ends of the shell body are respectively provided with a group of sealing structures, and the sealing sleeves are arranged between the cover plate and the end part of the shell body;
the membrane core comprises a core body and an end cover, the core body is arranged in the outer shell, and the end cover is sleeved in the connecting part of the sealing sleeve and the outer shell;
the sealing sleeve and the end part of the outer shell are provided with first sealing rings, a second sealing ring is arranged between the sealing sleeve and the cover plate, and a third sealing ring is arranged between the sealing sleeve and the end cover.
At present EDI membrane module sealing means, mainly for passing through the closing cap direct seal at the both ends of membrane core, at the assembling process, need use the press and require very high to the concentricity of all parts, use the in-process that the press emboliaed the shell at the membrane core, the sealing washer is very big with the frictional force of shell, at this in-process of emboliaing, the sealing washer can receive very big degree's damage, is unfavorable for the permanent sealed effect of subassembly. In addition, in the practical process, because the exchange resin in the membrane core needs to be continuously regenerated in the using process, and the regeneration process is usually uneven, in the practical use, the expansion stress distribution of each point in the membrane component is uneven, so that the membrane core generates non-axial bending force, and the sealing mode of the traditional sealing cover can only achieve the effect of axially applying sealing force, so that the diameter of a single branch of the traditional membrane component is usually below 40cm, and once the diameter exceeds the value, the membrane component sealed by the traditional sealing cover is easy to leak after being used for a long time, and the desalting effect is influenced.
This technical scheme passes through above-mentioned structure, in the assembling process, need not use the press to the sealing washer can not rub with shell body long distance during the assembly, has guaranteed the reliability of sealing washer. In addition, in the process of long-term use of the membrane module, because the outer shell, the sealing sleeve and the cover plate are of a three-layer sealing structure, when the exchange resin generates irregular deformation, the distance between the outer shell and the sealing sleeve can change in a non-axial direction, namely the distance between each point between the outer shell and the sealing sleeve is not uniform, so that the axial directions of the outer shell and the sealing sleeve are not overlapped any more. Therefore, the membrane assembly of the scheme reduces the requirement on axial sealing and reduces the difficulty and cost of production.
Preferably, a cathode column is arranged at the center of the core body, a plurality of groups of film units wound in a roll mode are arranged on the cathode column, each film unit comprises an anode film and a cathode film, a concentrated water chamber is arranged between the anode film and the cathode film, polar water chambers are respectively arranged at two ends of the concentrated water chamber, a fresh water chamber is arranged between the film units, exchange resin is filled in the fresh water chamber, and grid plates are arranged at two ends of the fresh water chamber;
the cathode column is internally provided with a central pipeline, the end part of the central pipeline penetrates out of the cover plate to form a first outlet, the outer shell is provided with a first inlet, the cover plates at the two ends of the outer shell are respectively provided with a second inlet and a second outlet, and the outer shell is provided with an electrode water outlet communicated with the electrode water chamber.
Adopt aforementioned seal structure for the diameter of membrane core can improve, and the membrane unit quantity in the membrane core also correspondingly increases, therefore is provided with utmost point hydroecium respectively at the both ends of the dense hydroecium of membrane unit, can discharge after the effectual utmost point water that collects the electrode side, thereby avoids membrane core scaling.
Preferably, one end of the membrane unit, which is far away from the cathode column, is provided with an anode sheet, and one end of the membrane unit, which is close to the cathode column, is provided with a cathode sheet. By adopting the anode sheet and cathode sheet structures, each membrane unit has an independent pressurizing electric field after being electrified, and the water purification effect is improved.
Preferably, the outer side of the core body is sleeved with an anode cylinder, and the anode cylinder is arranged, so that the stability of anode electrification can be effectively ensured.
Preferably, a fourth sealing ring is arranged between the first outlet and the cover plate to ensure the sealing performance of the first outlet.
Preferably, a boss for positioning the end cover is arranged on the sealing sleeve, and connecting bosses for connecting the sealing sleeve and the cover plate are arranged at two ends of the outer shell.
Preferably, the core body at least comprises seven groups of uniformly distributed membrane units.
Preferably, the second inlet and the second outlet are communicated with the concentrated water chamber, the liquid flow direction is that concentrated water flows through the concentrated water chamber after entering from the second inlet, and then is discharged from the second outlet; the central pipeline, the first outlet and the first inlet are communicated with the fresh water chamber, and the liquid flows in the direction of flow, so that after the purified water enters from the first inlet, the purified water flows through the fresh water chamber and the central pipeline in sequence and then is discharged from the first outlet. Due to the flow channel design, the flow direction of the concentrated water and the water to be purified in the membrane core is crossed by 90 degrees, the possibility of scaling in the membrane unit is reduced, and the purification efficiency is improved.
The current density and the current magnitude are related to the passing area, the area of the anode outside the membrane core of the roll-type EDI component with the structure is larger than the area of the cathode in the center of the membrane core, so that the current density outside the membrane core is smaller than the current density in the center of the membrane core, the potential energy of the whole electric field is gradually weakened from inside to outside in the radial direction of the membrane core, and various regions which are gradually excessive are formed. Since the fresh water to be purified contains a plurality of different salts, the electrolyte obtained by electrolysis often contains Ca 2+ 、Mg 2+ 、Na + 、Cl - 、SO 4 2- Isoactive ions and HCO 3 - 、HSiO 3 - And the like, which are less reactive. Therefore, the runners and the electric field are arranged in the mode, various ions can be separated in different areas, and the utilization rate of electric energy is improved while assembly fouling is effectively prevented.
A method for assembling a large-flux roll-type EDI component comprises the following steps:
assembling a membrane core, attaching an anode membrane and a cathode membrane to form membrane units, winding a plurality of groups of membrane units on a cathode column, lining a grid plate between the membrane units during winding, and assembling an anode cylinder outside the core body after winding is finished;
b, assembling a shell, (1) sleeving a membrane core into the shell, and then sleeving end covers at two ends of the membrane core, wherein the end covers are partially sleeved into the shell; (2) a third sealing ring is sleeved outside the end cover, a sealing sleeve is sleeved outside the end cover, and a first sealing ring and a second sealing ring are arranged at the upper end and the lower end of the sealing sleeve; (3) buckling a lower end cover plate on the end cover, and injecting exchange resin into the fresh water chamber; (4) and the upper end cover plate is buckled on the end cover, and the cover plate, the sealing sleeve and the connecting boss are tightly connected through bolts.
The assembling method has the advantages of simple process, small damage to the sealing ring, no need of a press machine or other equipment, and capability of reducing the installation cost on the premise of ensuring the service life of the equipment.
Preferably, in the step B, when the end caps are sleeved on both ends of the membrane core, a fourth sealing ring is installed between the first outlet and the cover plate.
According to the desalination method adopting the large-flux roll-type EDI component, an electric field cathode is connected at the center of a membrane core, an electric field anode is connected at the outer side of the membrane core, so that an electric field is formed between the middle part of the membrane core and the periphery of the membrane core, fresh water enters the membrane core from a first inlet, flows through a fresh water chamber and a central pipeline in sequence and is discharged from a first outlet, concentrated water enters the membrane core from a second inlet and flows into a concentrated water chamber and is discharged from a second outlet, the fresh water flows in the membrane core along the direction vertical to the axial direction of the membrane core in the whole process, the concentrated water flows in the axial direction of the membrane core, and the concentrated water and the fresh water are in cross flow; the anions and cations in the fresh water move to two sides under the action of the electric field, the anions pass through the cation membrane, the cations pass through the anion membrane and respectively enter the concentrated water chambers at two sides, and the desalting effect on the fresh water is finished.
In the above method, the concentrated water flows in the axial direction, and the fresh water flows in the radial direction. In such a way, the thick water and the thin water are in a complete cross flow state, so that the possibility of scaling inside the membrane unit is reduced, and the purification efficiency is improved; fresh water enters from the outer side of the component, flows from the outer side to the inner side, flows from the low current density area to the strong current density area, just accords with the desalting sequence of strong and weak ions, has strong electronegativity, can be removed in the low current density area by the removed ions easily, has weak electronegativity, and the ions which are not removed easily just flow through the strong current density area, thereby improving the removal efficiency and the current efficiency.
Preferably, the flow direction of the concentrated fresh water is opposite to that of the method, namely the fresh water flows along the axial direction, enters the membrane core from the second inlet, flows into the fresh water chamber and then is discharged from the second outlet; the concentrated water flows in the radial direction, enters from the first inlet, sequentially flows through the concentrated water chamber and the central pipeline, and is discharged from the first outlet. In such a way, the thick and fresh water is in a complete cross flow state, so that the possibility of scaling inside the membrane unit is reduced, and the purification efficiency is improved; the Dean flow can be generated in the spiral flow channel by the fluid, so that the thickness of the diffusion layer is reduced, and the mass transfer process is enhanced; in addition, the close distance of the polar plates can generate a strong electric field and can also improve the ion migration rate, so that the electric desalting efficiency is improved on one hand, and the possibility of scaling inside the membrane unit can be reduced on the other hand.
In conclusion, the invention has the beneficial effects that:
(1) according to the large-flux roll-type EDI component, the strength of an electric field in the flow direction of water to be purified is changed by the roll-type wound membrane core and the internal and external arranged negative and positive stages, so that the step-by-step separation of different particles is completed, the electric energy is fully utilized, and the scaling tendency of a concentrated water chamber is relieved.
(2) According to the large-flux roll-type EDI component, the shell adopts a split flange structure, the structure is simple, the assembly is convenient, the leakage problem of the traditional membrane component which is easy to produce is solved, the diameter of a single membrane component is increased, the system pipeline and the occupied space are saved, and the ton water cost is reduced.
(3) According to the large-flux roll-type EDI component and the assembly method thereof, the flux of a single membrane core of the prepared membrane component can reach 4m 3 More than h, reduces the cost per ton of water, saves system pipelines and occupied space, and has the cost ratio of 2 to 2m 3 The/h component is reduced by about 30%.
(4) According to the large-flux roll-type EDI component desalting method, the concentrated water and fresh water of the membrane unit are designed to be completely cross-flow, so that Ca2+ and Mg2+ ions which are easy to form scales in the membrane stack migrate through the cation exchange membrane from the fresh water inlet end when the component runs, and the Ca2+ and Mg2+ ions are prevented from being enriched to the concentrated water chamber cathode side along with the movement of water to the concentrated water outlet end while migrating to the cathode, so that the scaling possibility of the concentrated water chamber cathode side is reduced.
(5) According to the large-flux roll-type EDI component desalting method, the membrane unit has the characteristics that the spiral flow channel structure and the distance between polar plates are close, a Dean flow can be generated in a fluid in the spiral flow channel, the thickness of a diffusion layer is reduced, and the mass transfer process is enhanced; in addition, the close distance of the polar plates can generate a strong electric field and can also improve the ion migration rate, so that the electric desalting efficiency is improved on one hand, and the possibility of scaling inside the membrane unit can be reduced on the other hand.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a film core of the present invention;
FIG. 3 is an enlarged view of portion A of the present invention;
FIG. 4 is an enlarged view of the portion B of the present invention;
figure 5 is a schematic view of the winding of a film core in accordance with the present invention.
Detailed Description
The following specific examples are given by way of illustration only and not by way of limitation, and it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made in the examples without inventive faculty, and yet still be protected by the scope of the claims.
The present invention will be described in detail below by way of examples with reference to the accompanying drawings.
Example 1:
according to fig. 1, 3, 4, a large flux roll-type EDI module comprises: the membrane comprises a shell 1 and a membrane core 2, wherein the shell 1 comprises a shell body 11, sealing sleeves 12 and a cover plate 13, one sealing sleeve 12 and one cover plate 13 form a group of sealing structures, two ends of the shell body 11 are respectively provided with a group of sealing structures, and the sealing sleeves 12 are arranged between the cover plate 13 and the end part of the shell body 11;
the membrane core 2 comprises a core body 21 and an end cover 22, wherein the core body 21 is arranged inside the outer shell 11, the end cover 22 is sleeved inside the joint of the sealing sleeve 12 and the outer shell 11, and seven groups of uniformly distributed membrane units 3 are arranged in the core body 21.
A first sealing ring 14 is arranged at the end part of the sealing sleeve 12 and the outer shell 11, a second sealing ring 15 is arranged between the sealing sleeve 12 and the cover plate 13, a third sealing ring 16 is arranged between the sealing sleeve 12 and the end cover 22, and a fourth sealing ring 17 is arranged between the first outlet 42 and the cover plate 13.
The sealing sleeve 12 is provided with a boss 121 for positioning the end cap 22, and the two ends of the outer housing 11 are provided with connecting bosses 111 for connecting the sealing sleeve 12 and the cover plate 13.
According to the fig. 2 and 5, a cathode column 211 is arranged at the center of the core body 21, a plurality of groups of film units 3 wound in a roll manner are arranged on the cathode column 211, each film unit 3 comprises an anode film 31 and a cathode film 32, a concentrated water chamber 4 is arranged between the anode film 31 and the cathode film 32, two ends of the concentrated water chamber 4 are respectively provided with a polar water chamber 7, a fresh water chamber 5 is arranged between the film units 3, exchange resin 51 is filled in the fresh water chamber 5, and grid plates 52 are arranged at two ends of the fresh water chamber 5; be provided with central pipeline 41 in the cathode column 211, outside the apron 13 was worn out to the tip of central pipeline 41, formed first export 42, be provided with first import 43 on the shell body 11, be provided with second import 61 and second export 62 on the apron 13 at shell body 11 both ends respectively, be provided with the utmost point water export 71 that is linked together with utmost point water room 7 on the shell body 11, the one end that membrane unit 3 kept away from cathode column 211 is provided with anode strip 33, the one end that membrane unit 3 is close to cathode column 211 is provided with cathode strip 34.
In the large-flux roll-type EDI component, a second inlet 61 and a second outlet 62 are communicated with the concentrated water chamber 4, the liquid flow direction is that concentrated water enters from the second inlet 61, flows through the concentrated water chamber 4 and then is discharged from the second outlet 62; the central tube 41, the first outlet 42, and the first inlet 43 are connected to the fresh water chamber 5, and the flow direction of the liquid is such that the water to be purified flows through the fresh water chamber 5 and the central tube 41 in sequence after entering from the first inlet 43, and then is discharged from the first outlet 42.
Example 2:
the difference from the embodiment 1 is that, as shown in fig. 2, the anode cylinder 212 is sleeved outside the core body 21, so that the anode can be electrified stably.
Example 3:
the method for assembling the large-flux roll-type EDI module of embodiment 1 includes the steps of:
assembling a membrane core 2, attaching an anode membrane 31 and a cathode membrane 32 to form membrane units 3, winding a plurality of groups of membrane units 3 on a cathode column 211, lining a grid plate 52 between the membrane units 3 during winding, and assembling an anode cylinder 212 on the outer side of a core body 21 after winding is finished;
b, assembling the shell, (1) sleeving the membrane core 2 into the shell body 11, then sleeving the end covers 22 at two ends of the membrane core 2, partially sleeving the end covers 22 into the shell body 11, and assembling the fourth sealing ring 17 into the first outlet 42 and the cover plate 13 when the end covers 22 are sleeved at two ends of the membrane core 2; (2) a third sealing ring 16 is sleeved outside the end cover 22, a sealing sleeve 12 is sleeved outside the end cover 22, and a first sealing ring 14 and a second sealing ring 15 are arranged at the upper end and the lower end of the sealing sleeve 12; (3) buckling the lower end cover plate 13 on the end cover 22, and injecting exchange resin 51 into the fresh water chamber 5; (4) the upper end cover plate 13 is buckled on the end cover 22, and the cover plate 13, the sealing sleeve 12 and the connecting boss 111 are tightly connected through bolts.
Example 4:
the desalination method of the roll-type EDI module with medium and large flux in embodiment 1 or 2 includes connecting an electric field cathode at the cathode column 211 or the cathode sheet 34 of the membrane core 2, and connecting an electric field anode at the anode cylinder 212 or the anode sheet 33 of the membrane core 2, so that an electric field is formed between the middle of the membrane core 2 and the periphery of the membrane core 2, fresh water enters the membrane core 2 from the first inlet 43, sequentially flows through the fresh water chamber 5 and the central pipeline 41, and is discharged from the first outlet 42, concentrated water enters the membrane core 2 from the second inlet 61, flows into the concentrated water chamber 4, and is discharged from the second outlet 62, and in the whole process, the fresh water flows in the membrane core 2 along the direction perpendicular to the axial direction of the membrane core 2, and the concentrated water flows in the axial direction of the membrane core 2, and the concentrated water and the fresh water cross-flow; the anions and cations in the fresh water move to two sides under the action of the electric field, the anions pass through the cation membrane 31, the cations pass through the anion membrane 32 and respectively enter the concentrated water chambers 4 at two sides, and the desalting effect on the fresh water is finished. The flow of the concentrated water is in the axial direction, and the flow of the fresh water is in the radial direction. In such a flow direction, the thick water and the thin water are in a complete cross flow state, so that the possibility of scaling inside the membrane unit is reduced, and the purification efficiency is improved; fresh water enters from the outer side of the component, flows from the outer side to the inner side, flows from the low current density area to the strong current density area, just accords with the desalting sequence of strong and weak ions, has strong electronegativity, can be removed in the low current density area by the removed ions easily, has weak electronegativity, and the ions which are not removed easily just flow through the strong current density area, thereby improving the removal efficiency and the current efficiency.
Meanwhile, the fresh water chamber 5 contains exchange resin 51, and under the action of an electric field, a part of water molecules of the fresh water are decomposed into hydrogen ions and hydroxyl ions. These hydrogen ions and hydroxide ions continuously regenerate the exchange resin 51 filled in the fresh water chamber 5. The positive cations and negative anions are respectively adsorbed on the corresponding resins, and are migrated through the corresponding resins by the electric field anode and cathode, pass through the anode membrane 31 and the cathode membrane 32, enter the concentrated water chamber 4 and are discharged. The positive membrane 31 allows only anions to pass through, while cations and liquids cannot; the negative membrane 32 allows only anions to pass through, but anions and liquids cannot.
Figure DEST_PATH_IMAGE001
TABLE 1
Table 1 shows the water treatment parameters of a single membrane core of the membrane module of this example, and Table 2 shows the conventional 2m 3 H water treatment parameters of single membrane core of the membrane component.
Figure 638272DEST_PATH_IMAGE002
TABLE 2
The table comparison data shows that the water yield of a single mold core is greatly improved, and the water quality similar to that of the traditional membrane component is still kept in the aspects of water yield resistivity and component pressure drop, so that the water treatment efficiency is improved.
Example 5:
the difference from the embodiment 4 is that the flow direction of the concentrated fresh water is opposite to the method in the embodiment 4, namely the fresh water flows along the axial direction, enters the membrane core 2 from the second inlet 61, flows into the fresh water chamber 5 and then is discharged from the second outlet 62; the concentrated water flows in the radial direction, and the concentrated water enters from the first inlet 43, flows through the concentrated water chamber 5 and the central pipeline 41 in sequence, and is discharged from the first outlet 42. In such a flow direction, the concentrated fresh water is in a complete cross flow state, so that the possibility of scaling inside the membrane unit is reduced, and the purification efficiency is improved; dean flow can be generated in the spiral flow channel by the fluid, so that the thickness of the diffusion layer is reduced, and the mass transfer process is enhanced; in addition, the close distance of the polar plates can generate a strong electric field and can also improve the ion migration rate, so that the electric desalting efficiency is improved on one hand, and the possibility of scaling inside the membrane unit can be reduced on the other hand.

Claims (9)

1. A large-flux rolled EDI component comprising: the membrane comprises a shell (1) and a membrane core (2), and is characterized in that the shell (1) comprises a shell body (11), sealing sleeves (12) and a cover plate (13), wherein one sealing sleeve (12) and one cover plate (13) form a group of sealing structures, two ends of the shell body (11) are respectively provided with a group of sealing structures, and the sealing sleeves (12) are arranged between the cover plate (13) and the end part of the shell body (11);
the membrane core (2) comprises a core body (21) and an end cover (22), the core body (21) is arranged in the outer shell (11), and the end cover (22) is sleeved in the connecting part of the sealing sleeve (12) and the outer shell (11);
a first sealing ring (14) is arranged at the end parts of the sealing sleeve (12) and the outer shell (11), a second sealing ring (15) is arranged between the sealing sleeve (12) and the cover plate (13), and a third sealing ring (16) is arranged between the sealing sleeve (12) and the end cover (22);
the sealing sleeve (12) is provided with a boss for positioning the end cover (22), and two ends of the outer shell (11) are provided with connecting bosses for the sealing sleeve (12) and the cover plate (13);
the water yield of the single membrane core (2) is 3.8-4.5m 3 /h；
The cover plate (13), the sealing sleeve (12) and the connecting boss are tightly connected through bolts.
2. The roll type EDI component of claim 1, wherein a cathode column (211) is arranged at the center of the core body (21), a plurality of groups of roll type wound membrane units (3) are arranged on the cathode column (211), the membrane units (3) comprise an anode membrane (31) and a cathode membrane (32), a concentrated water chamber (4) is arranged between the anode membrane (31) and the cathode membrane (32), two ends of the concentrated water chamber (4) are respectively provided with an electrode water chamber (7), a fresh water chamber (5) is arranged between the membrane units (3), the fresh water chamber (5) is filled with exchange resin (51), and two ends of the fresh water chamber (5) are provided with grid plates (52);
be provided with central pipeline (41) in negative pole post (211), the tip of central pipeline (41) is worn out outside apron (13), forms first export (42), be provided with first import (43) on shell body (11), be provided with second import (61) and second export (62) on apron (13) at shell body (11) both ends respectively, be provided with on shell body (11) with utmost point water export (71) that utmost point hydroecium (7) are linked together.
3. A large flux rolled EDI module according to claim 2, characterized in that the end of the membrane unit (3) remote from the cathode column (211) is provided with an anode sheet (33) and the end of the membrane unit (3) close to the cathode column (211) is provided with a cathode sheet (34).
4. A large flux rolled EDI assembly according to claim 2 or 3, characterized by an anode barrel (212) sleeved outside the core (21).
5. A large flux rolled EDI assembly according to claim 4 wherein a fourth seal (17) is disposed between said first outlet (42) and said cover plate (13).
6. A large flux rolled EDI module according to claim 5 wherein said core (21) comprises at least seven groups of equispaced membrane units (3).
7. A method of assembling a large flux roll-type EDI module according to any one of claims 4 to 6, comprising the steps of:
a, assembling a membrane core (2), attaching an anode membrane (31) and a cathode membrane (32) to form membrane units (3), winding a plurality of groups of membrane units (3) on a cathode column (211), lining a grid plate (52) between the membrane units (3) during winding, and assembling an anode cylinder (212) on the outer side of a core body (21) after winding is completed;
b, assembling a shell, (1) sleeving a membrane core (2) into the shell (11), then sleeving end covers (22) at two ends of the membrane core (2), and partially sleeving the end covers (22) into the shell (11); (2) a third sealing ring (16) is sleeved outside the end cover (22), a sealing sleeve (12) is sleeved outside the end cover (22), and a first sealing ring (14) and a second sealing ring (15) are arranged at the upper end and the lower end of the sealing sleeve (12); (3) buckling a lower end cover plate (13) on the end cover (22), and injecting exchange resin (51) into the fresh water chamber (5); (4) and an upper end cover plate (13) is buckled on the end cover (22), and the cover plate (13), the sealing sleeve (12) and the connecting boss are tightly connected through bolts.
8. The method for assembling a large-flux rolled EDI component as claimed in claim 7, wherein in step B, when the membrane core (2) is sleeved on the end cap (22) at both ends, a fourth sealing ring (17) is arranged between the first outlet (42) and the cover plate (13).
9. A desalination method using the large-flux rolled EDI module according to any one of claims 4 to 6, characterized in that an electric field cathode is connected to the center of the membrane core (2), an electric field anode is connected to the outer side of the membrane core (2), so that an electric field is formed between the middle of the membrane core (2) and the outer periphery of the membrane core (2), fresh water enters the membrane core (2) from the first inlet (43), and flows through the fresh water chamber (5) and the central pipe (41) in sequence, and then is discharged from the first outlet (42), concentrated water enters the membrane core (2) from the second inlet (61), and flows into the concentrated water chamber (4), and then is discharged from the second outlet (62), and during the whole process, the fresh water flows in the membrane core (2) in a direction perpendicular to the axial direction of the membrane core (2), and the concentrated water flows in the axial direction of the membrane core (2), and the concentrated water and the fresh water cross-flow; the anions and cations in the fresh water move to two sides under the action of the electric field, the anions pass through the cation membrane (31), the cations pass through the anion membrane (32) and respectively enter the concentrated water chambers (4) at two sides, and the desalting effect of the fresh water is finished.
CN201611197806.XA 2016-12-22 2016-12-22 Large-flux roll-type EDI assembly, assembly method thereof and desalination method Active CN106474927B (en)

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CN204198466U (en) * 2014-08-15 2015-03-11 浙江中凯瑞普环境工程股份有限公司 A kind of electric salt remover with integral type filter plate
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CN206951003U (en) * 2016-12-22 2018-02-02 浙江中凯瑞普环境工程股份有限公司 A kind of big flux rolling EDI components

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Denomination of invention: A high flux roll EDI component, its assembly method, and desalination method

Effective date of registration: 20230330

Granted publication date: 20230310

Pledgee: South Taihu New Area sub branch of Huzhou Wuxing Rural Commercial Bank Co.,Ltd.

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