CN1824610A - Cross flow designed roll type electric salt eliminator component element - Google Patents
Cross flow designed roll type electric salt eliminator component element Download PDFInfo
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- CN1824610A CN1824610A CN 200510049156 CN200510049156A CN1824610A CN 1824610 A CN1824610 A CN 1824610A CN 200510049156 CN200510049156 CN 200510049156 CN 200510049156 A CN200510049156 A CN 200510049156A CN 1824610 A CN1824610 A CN 1824610A
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Abstract
The present invention relates to a electric desalting component. Said desalting component includes a central tube and its concentric external shell which can be used as a pole of electrode, on the external shell another pole of electrode is set, between the central tube and external shell the alternatively-arranged cation-exchange membranes and anion-exchange membranes are set, and the alternative arrangement of cation-exchange membranes and anion-exchange membranes can make the space between the central tube and external shell be separated into electrode chamber, fresh water chamber and saltwater chamber, the opposite two ends of cation and anion exchange membranes are closed, and the saltwater inlet and outlet are respectively set on opened two ends of cation and anion exchange membranes. Besides, said invention also provides its working principle and concrete operation method.
Description
Technical field
The present invention relates to a kind of electric salt eliminator component element, relate in particular to a kind of fresh water and dense water and design, do not have the electric desalination assembly of dense water circulation system in the cross-flow mode.
Background technology
The electricity desalting process is under the effect of DC electric field and electroactive medium, make contained ion generation directional migration in the liquid, simultaneously, utilize the selection perviousness of anion and cation exchange membrane to zwitterion in the solution, make ion transfer to another kind of solution, thereby reach the membrane sepn process of desalination purpose from a kind of solution.
Typical electric desalination plant generally comprises positive and negative electrode, between positive and negative electrode, and the anion and cation exchange membrane of arranging alternately, and the electrode vessel, dense hydroecium and the freshwater room that are separated by the negative and positive film.Water to be processed enters freshwater room, and under the effect of ion exchange resin and electric current, the charged ion in the water is anode and cathode direction migration respectively, and positively charged ion moves to cathode direction, enters into dense hydroecium by cationic exchange membrane from freshwater room.Similarly, electronegative ion anode direction migration enters into dense hydroecium by anion-exchange membrane from freshwater room.The ion continuation meeting that enters into dense hydroecium is moved on original migratory direction, but because the selective permeation characteristic of ion-exchange membrane, promptly cationic exchange membrane only allows that positively charged ion passes through, and anion-exchange membrane only allows that negatively charged ion passes through, so the ion in dense hydroecium can't return in the freshwater room.So just reached the purpose of water in the purifying freshwater room.
In the EDI assembly, it is different that various ionic are deviate from order.At first being that high valence ion is deviate from, secondly is easily to deviate from ion at a low price to be deviate from, and is weak ionization ion and hydrogen ion and hydroxide ion at last.
And scission reaction also can take place in the water in the freshwater room under the effect of electric current, particularly at ion exchange resin and ion-exchange membrane interface, the scission reaction of water takes place easily.Scission reaction has generated hydrogen ion and hydroxide ion, and they play regeneration to amberlite.Therefore, the EDI technology is the process that realizes without soda acid ion exchange resin cyclic regeneration.
In existing electric desalination plant, especially in plate and frame EDI assembly, the current in freshwater room and the dense hydroecium generally be in the same way or claim and stream (as shown in Figure 3).1 be dense hydroecium among the figure wherein, 2 is freshwater room, the 3rd, and utmost point hydroecium; The 5th, dense water water inlet, 6 are the fresh water water inlet; The 7th, anodal, the 8th, negative pole; 9 and 10 is respectively the water inlet of utmost point water, and 11 is cationic exchange membrane, the 12nd, and anion-exchange membrane; The 13rd, dense water water outlet, 14 is the fresh water water outlet, 15 and 16 is respectively the water outlet of utmost point water.Dose ion-exchange material such as ion exchange resin at the assembly freshwater room, dense hydroecium and utmost point hydroecium are dosed ion-exchange material such as ion exchange resin or inertia and are supported grid.In this design, Ca
++And Mg
++Move to the dense hydroecium 1 through cationic exchange membrane 11 from freshwater room, this migration is to take place at the feed-water end of assembly, after they enter into dense hydroecium, under the effect of electric current, will continue to move to cathode direction, meanwhile they can move with the water side of current direction assembly again.Work as Ca
++And Mg
++After arriving anion-exchange membrane 12, they can't get back in the freshwater room 2 by anion-exchange membrane 12, and they can go out assembly with concentrated stream as a result.
And on the other hand, part hydrogen ion that water-splitting reaction is produced and hydroxide ion and the luxuriant son of light current such as bicarbonate radical and carbanion also can see through ion-exchange membrane enter into dense hydroecium, dense hydroecium hydrogen ion and hydroxide ion in conjunction with and generate water.But,, and present strongly-acid because local hydrogen ion concentration is higher at cationic exchange membrane 11 dense hydroecium side surfaces.At anion-exchange membrane 12 dense hydroecium side surfaces,, and present strong basicity because local hydroxide radical, bicarbonate radical and carbon acid ion concentration are higher.This surface layer thickness depends on and concentrated stream condition emotionally that when the moving disturbance of concentrated stream was violent, surface layer thickness was just thin; And the moving disturbance of concentrated stream hour, surface layer thickness is just thick.
In existing plate and frame electricity desalination plant, the dense hydroecium side of anion-exchange membrane is near the position of assembly water side, by the Ca that anion-exchange membrane stopped
++And Mg
++Ion will and hydroxide radical, hardness ions combinations such as bicarbonate radical and carbonate produce the precipitation fouling.
In existing rolling electricity desalination plant, be that three bandings with anion and cation exchange membrane close and form a film bag shape, one detached strips be set, make the flow direction of dense water take the shape of the letter U in the centre of film bag, detached strips bottom correspondence dense water water inlet, and detached strips top correspondence dense water water outlet.It is the detached strips bottom that the hardness ions of moving to dense hydroecium from freshwater room is introduced into dense water water inlet, and entering into dense water water outlet with concentrated stream then is detached strips top; Move to the hydroxide radical of dense hydroecium from freshwater room, bicarbonate radical and carbanion, then entering into dense water water outlet is detached strips top.So, be detached strips top hardness ions and hydroxide radical in dense water water outlet, bicarbonate radical and carbanion etc. will meet, and precipitation forms dirt.In addition, easily dense water is formed the dead angle at some position of film bag (as corner), herein water flow velocity slowly or not mobile, therefore easier fouling on these positions.Fouling not only influences the works better of ion-exchange membrane, also can increase the concentrated stream dynamic resistance simultaneously, reduces the concentrated stream amount, after flow reduces, because flow velocity descends hardness ions that makes such as Ca
++And Mg
++Deng can not in time flowing out dense hydroecium, also aggravated fouling, so just formed vicious cycle, influence the desalination performance and the work-ing life of assembly, thereby influence the interchange of water body and cause water-yielding capacity to reduce.
Summary of the invention
It is more reasonable that the present invention mainly provides a kind of structure, make the current in freshwater room and the dense hydroecium realize the cross-flow design, thereby can avoid hardness ions and hydroxide radical, bicarbonate radical and carbanion plasma meet, shorten the moving stroke of concentrated stream simultaneously, remove the dead angle in the film bag, reduced the electric desalination assembly of the possibility of dense hydroecium fouling; Solve current in existing in prior technology freshwater room and the dense hydroecium and generally be in the same way or claim and stream, and generally adopt dense water cycle, make the dense hydroecium side of anion-exchange membrane near the position of assembly water side, fouling very easily takes place, influence the desalination performance and the work-ing life of assembly, thus the technical problem that causes water-yielding capacity to reduce.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of electric salt eliminator component element, comprise as the pipe core of electrode one utmost point and with its concentric shell, shell is provided with another utmost point of electrode, between pipe core and shell, be provided with the anion and cation exchange membrane of alternately arranging, the electrode vessel, dense hydroecium and the freshwater room that are separated by the negative and positive film, the closed at both ends that described anion and cation exchange membrane is relative, and the water-in of dense water and water outlet are divided into the two ends of anion and cation exchange membrane opening.Dense hydroecium need not with salt, can fill the sub-material of diversion in it, also can not fill the sub-material of diversion; Current in freshwater room and the dense hydroecium are designed to the cross-flow form, be that freshet flows along the assembly axial direction due, dense water then is radially spiral and flows, and dense water does not circulate, directly discharge with utmost point water at the assembly exit end, because dense water and fresh water flow direction are the cross-flow designs, so reduced Ca
++And Mg
++The hydroxide radical at ion and dense hydroecium water exit end place, the chance that bicarbonate radical and carbonate meet, thus reduced the possibility of dense hydroecium fouling.
As preferably, described anion and cation exchange membrane forms the film bag shape of both ends open, leads directly between the film bag both ends open, and opening direction is along diametric(al), and opening can be the standard-sized sheet mouth or be provided with several spaced apertures.Has removed in the middle of the film bag at interval, thereby avoided or slowed down Ca
++, Mg
++Etc. easy scale-forming ion in the dense hydroecium side of anion-exchange membrane, close assembly water side, be the fouling at more alkaline position, and dense water takes the air line, shortened the flow process of dense water, directly discharge with utmost point water at the assembly water outlet, removed the dead angle problem in the film bag, thereby reduced the possibility of the fouling of dense hydroecium.
As preferably, described pipe core is the direct piping of the one of hollow.Pipe core can be used as the water-in of dense water, also can be used as the water outlet of dense water.
As preferably, described pipe core is provided with several equally distributed openings, and opening links to each other with unit, concentrated stream road.The number of openings that is provided with on the pipe core is corresponding with the opening on the film bag.
As preferably, collecting chamber is arranged on shell one side, is provided with some uniform openings at collecting chamber one end, and opening links to each other with corresponding opening on the film bag.The opening of collecting chamber one end is identical with number of openings on the film bag, and relative position can align, and also can have staggeredly, and it is moving to be more conducive to concentrated stream like this.The opening of collecting chamber one side also can be the water-in of dense water, also can be water outlet.
As preferably, as dense water water-in, be dense water water outlet with near the opening the water collection sheet on the shell with pipe core.Dense water can enter from pipe core, flow out with utmost point water from outer cover port, and original freshet is to constant, and the trend of dense water and fresh water is 90 ° substantially.
Therefore, the present invention has the hardness ions of avoiding and hydroxide radical, bicarbonate radical and carbanion plasma meet, shorten the concentrated stream journey, eliminated the problems such as the moving dead angle of concentrated stream in the film bag, reduce the possibility of fouling, simultaneously, structure is also comparatively simple, thereby has improved water production rate and ion-exchange performance, has prolonged the work-ing life of electric salt remover.
Description of drawings:
Accompanying drawing 1 is the overview of the roll type electric salt eliminator component element of a kind of cross-flow design of the present invention.
Accompanying drawing 2 is to move towards synoptic diagram in the deep or light moisture film bag of roll type electric salt eliminator component element of a kind of cross-flow design of the present invention.
Accompanying drawing 3 is to move towards synoptic diagram in the deep or light moisture film bag of original roll type electric salt eliminator component element.
Accompanying drawing 4 is roll type electric salt eliminator component element test flow charts of a kind of cross-flow design of the present invention.
The product water of a. electric salt remover in the accompanying drawing 4; B. the water inlet c. concentrated water discharge d. utmost point water of electric salt remover discharging
The concrete example of implementing:
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment 1: as shown in Figure 1, a kind of rolling electricity desalination assembly of cross-flow design is the center with the dense water pipe in center, and ion-exchange membrane is rolled into cylindrical shape, alternately is arranged among the cylindrical metal housing, and whole device is rolled structure in the shape of a spiral.Described ion-exchange membrane is divided into anion-exchange membrane 12 and cationic exchange membrane 11, constitutes dense hydroecium 1, the freshwater room 2 of electric desalination assembly respectively, utmost point hydroecium 3.Described freshwater room 2 is filled with ion exchange resin, and dense hydroecium 1 is not then filled.The positive pole 7 of center dense water pipe 17 double as electricity desalination assembly, and place metal shell outside it as negative pole 8.Two electrodes are adjacent near anion and cation exchange membrane again respectively and constitute utmost point hydroecium 3.
The rolling electric salt remover of above-mentioned cross-flow design is tested by the flow process shown in the accompanying drawing 4, and test condition is that fresh water water inlet specific conductivity is 21.9 μ S/cm, water outlet flow 2.0m
3/ hr, dense water and utmost point discharge are 0.11m
3/ hr, fresh water water inlet and dense water inflow temperature are respectively 25.6 ℃ and 25.8 ℃, and fresh water water inlet pH is 6.5, and actuating current is 6A.
Test result is that fresh water production water resistance rate is 17.2M Ω .cm, and component voltage is 148V, and dense water out specific conductivity is 273.5 μ S/cm, and the rate of recovery is 94.8%.
The structure of invention is identical with embodiment 1, has used in the dense hydroecium of test suite and can arrive ionic material as upholder, and other is as embodiment 1.Test condition is that fresh water water inlet specific conductivity is 4.0 μ S/cm, water outlet flow 2.0m
3/ hr, dense water and utmost point discharge are 0.10m
3/ hr, fresh water water inlet and dense water inflow temperature are respectively 24.5 ℃ and 24.6 ℃, and fresh water water inlet pH is 7.0, and actuating current is 3A.
Test result is that fresh water production water resistance rate is 18.0M Ω .cm, and component voltage is 33V, and dense water out specific conductivity is 82.2 μ S/cm, and the rate of recovery is 95.2%.
Claims (8)
1. the roll type electric salt eliminator component element of cross-flow design, comprise as the pipe core (17) of electrode one utmost point and with its concentric shell (18), shell (18) is provided with another utmost point of electrode, between pipe core (17) and shell (18), be provided with the yin, yang ion-exchange membrane of alternately arranging, the utmost point hydroecium (3), dense hydroecium (1) and the freshwater room (2) that are separated by the yin, yang ion-exchange membrane, it is characterized in that: the relative closed at both ends of described yin, yang ion-exchange membrane, and the water-in of dense water and water outlet are divided into the two ends of yin, yang ion-exchange membrane opening.
2. the roll type electric salt eliminator component element of cross-flow design according to claim 1, it is characterized in that: described anion and cation exchange membrane forms the film bag shape of both ends open, lead directly between the film bag both ends open, opening direction is along diametric(al), and opening can be the standard-sized sheet mouth or be provided with several spaced apertures.
3. the roll type electric salt eliminator component element of cross-flow design according to claim 1 is characterized in that: described pipe core (17) is the direct piping of the one of hollow.
4. according to the roll type electric salt eliminator component element of claim 1 or 2 or 3 described cross-flow designs, it is characterized in that: described pipe core (17) is provided with several equally distributed openings, and opening links to each other with unit, concentrated stream road.
5. according to the roll type electric salt eliminator component element of claim 1 or 2 or 3 described cross-flow designs, it is characterized in that: collecting chamber is arranged on shell (18) one sides, is provided with some uniform openings at collecting chamber one end, and opening links to each other with corresponding opening on the film bag.
6. the roll type electric salt eliminator component element of cross-flow design according to claim 4, it is characterized in that: collecting chamber is arranged on shell (18) one sides, is provided with some uniform openings at collecting chamber one end, and opening links to each other with corresponding opening on the film bag.
7. according to the roll type electric salt eliminator component element of claim 1 or 2 or 3 described cross-flow designs, it is characterized in that: as dense water water-in (19), is dense water water outlet (20) with near the opening the water collection sheet on the shell with pipe core.
8. the roll type electric salt eliminator component element of cross-flow design according to claim 6, it is characterized in that: as dense water water-in (19), is dense water water outlet (20) with near the opening the water collection sheet on the shell with pipe core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510049156 CN1824610A (en) | 2005-02-25 | 2005-02-25 | Cross flow designed roll type electric salt eliminator component element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510049156 CN1824610A (en) | 2005-02-25 | 2005-02-25 | Cross flow designed roll type electric salt eliminator component element |
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| Publication Number | Publication Date |
|---|---|
| CN1824610A true CN1824610A (en) | 2006-08-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510049156 Pending CN1824610A (en) | 2005-02-25 | 2005-02-25 | Cross flow designed roll type electric salt eliminator component element |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104192956A (en) * | 2014-08-15 | 2014-12-10 | 浙江中凯瑞普环境工程股份有限公司 | Roll electric demineralizer |
| WO2018157327A1 (en) * | 2017-03-01 | 2018-09-07 | General Electric Company | Spiral wound bipolar electrodialysis cell |
| CN111003764A (en) * | 2019-12-31 | 2020-04-14 | 浙江中凯瑞普环境工程股份有限公司 | Electric desalting system for reclaimed water and application thereof |
| CN115259331A (en) * | 2022-08-26 | 2022-11-01 | 中国科学院生态环境研究中心 | Membrane contact reactor and treatment system for wastewater deamination |
| CN115636483A (en) * | 2022-12-14 | 2023-01-24 | 中国科学院合肥物质科学研究院 | Sewage treatment system based on electro-adsorption and control method |
-
2005
- 2005-02-25 CN CN 200510049156 patent/CN1824610A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104192956A (en) * | 2014-08-15 | 2014-12-10 | 浙江中凯瑞普环境工程股份有限公司 | Roll electric demineralizer |
| CN104192956B (en) * | 2014-08-15 | 2015-10-28 | 浙江中凯瑞普环境工程股份有限公司 | A kind of coiling type electric salt remover |
| WO2018157327A1 (en) * | 2017-03-01 | 2018-09-07 | General Electric Company | Spiral wound bipolar electrodialysis cell |
| GB2574566A (en) * | 2017-03-01 | 2019-12-11 | Gen Electric | Spiral wound bipolar electrodialysis cell |
| GB2574566B (en) * | 2017-03-01 | 2022-07-13 | Gen Electric | Spiral wound bipolar electrodialysis cell |
| CN111003764A (en) * | 2019-12-31 | 2020-04-14 | 浙江中凯瑞普环境工程股份有限公司 | Electric desalting system for reclaimed water and application thereof |
| CN115259331A (en) * | 2022-08-26 | 2022-11-01 | 中国科学院生态环境研究中心 | Membrane contact reactor and treatment system for wastewater deamination |
| CN115259331B (en) * | 2022-08-26 | 2023-09-08 | 中国科学院生态环境研究中心 | Membrane contact reactor and treatment system for deamination of wastewater |
| CN115636483A (en) * | 2022-12-14 | 2023-01-24 | 中国科学院合肥物质科学研究院 | Sewage treatment system based on electro-adsorption and control method |
| CN115636483B (en) * | 2022-12-14 | 2023-07-04 | 中国科学院合肥物质科学研究院 | Sewage treatment system based on electro-adsorption and control method |
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