CN207435163U - A kind of electric deionizer for strengthening antiscale - Google Patents
A kind of electric deionizer for strengthening antiscale Download PDFInfo
- Publication number
- CN207435163U CN207435163U CN201721260179.XU CN201721260179U CN207435163U CN 207435163 U CN207435163 U CN 207435163U CN 201721260179 U CN201721260179 U CN 201721260179U CN 207435163 U CN207435163 U CN 207435163U
- Authority
- CN
- China
- Prior art keywords
- water
- plate
- fresh water
- partition plate
- edi
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The utility model discloses a kind of electric deionizers for strengthening antiscale, the device includes positive plate, cathode chamber partition plate, the n repeatable groundwork unit being stacked successively in order, the 1 groundwork unit and negative plate for substituting concentrated stream partition plate with anode chamber partition plate with the groundwork unit of the light water flow partition board of fresh water commutation partition plate replacement, m repeatable groundwork units, 1, and n, m are integer and n >=m >=1.The internal water flow scheme design and operation process of electric deionizer provided by the utility model, so that electrodeionization desalination processes can both be run and non-scaling under the water inlet stiffness conditions of 5 10mg/L, the performance of excellent tolerance influent quality fluctuation is also equipped with simultaneously, is had both and is strengthened anti-scaling property and high operation stability.
Description
Technical field
The utility model is related to a kind of device of water desalination, particularly one kind possesses reinforcing anti-scaling property, is taken off for depth
Salt prepares the electric deionizer of high purity water, belongs to technical field of energy saving and environmental protection.
Background technology
Electrodeionization (Electrodeionization, abbreviation EDI), is referred to as packed-bed electrodialysis earliest, is by ion
The electric drive membrane separation technique that exchanger resin and electrodialysis organically combine.EDI is that ion exchange resin is filled in thickness increase
Electrodialytic freshwater room in, under DC electric field effect, positive and negative ion in freshwater room water is along ion exchange resin and ion
The ion channel that exchange membrane is formed migrates respectively to cathode and positive extreme direction, cation permselective cation-exchange membrane, cloudy
Ion selectivity penetrates anion-exchange membrane, respectively enters and is arrested in adjacent concentrated water room.EDI both make use of electrodialysis
Can the advantages of continuously desalination and ion exchange resin can be with deep desaltings, and overcome electrodialysis desalination and be not thorough, it is impossible to is straight
It connects the negative effect of high purity water and ion exchange resin needs frequently to consume a large amount of acid-alkali regenerations, exhaust emission gives up
Liquid is unable to the defects of continuous work, and water process processed can be carried out continuously for a long time.
EDI membrane technologies have obtained wide application in prepared by the high purity water in the fields such as the energy, electronics, bio-pharmaceuticals, but
Existing various business EDI technologies still have its limitation so that fail large area so far in pure water market segment and substitute tradition
Mixed bed ion switching technology.It is very harsh to flow condition requirement that this limitation is mainly manifested in EDI, wherein requirement water inlet
It is key point that hardness, which has to be lower than 1mg/L or even below 0.5mg/L,.
Why EDI has rigors to the hardness of raw water, is because its technical process is easy to there are hardness ionses
Under conditions of fouling is formed in compartment so that irreversible destruction occurs for process.High purity water is prepared for deep desalting
For EDI, the relatively conventional water body of ion concentration of raw water is very low, and such as most common raw water as reverse osmosis (RO) is produced
Water, typical salt content are essentially 1-10mg/L.Under the conditions of this low concentration raw water, resin and film in diluting compartment connect with water
Persistently there are water decomposition reactions in tactile boundary layer：H2O→H++OH-, then certain density Ca is contained in raw water2+、Mg2+Deng
When hardness ions and high valence ion, the easy OH with one of water decomposition reaction product-Ions binding, generation Mg (OH)2、Ca
(OH)2Slightly solubilities metal hydroxides is waited, the constantly improve of concentration will cause serious scale.Due under the working condition of EDI,
Water decomposition reaction is requirement, OH-The dynamic regeneration that ion pair fills negative resin is essential, because to avoid fouling shape
Into the Ca in accurate control water inlet2+、Mg2+Ion concentration becomes the key means of routine EDI technologies.
In actual engineering of water treatment, to reach above-mentioned water inlet hardness number, using two-stage RO as the prime of EDI at
Science and engineering skill becomes a realistic choice.For most water bodys, by two-stage RO film desalinations, the salt content of production water exists more
Below 3mg/L, wherein hardness are mostly in 0.5mg/L or even below 0.2mg/L, it is sufficient to ensure the safe and stable operation of EDI.For
For identical water yield, pre-treatment is compared using two-stage RO with level-one RO, cost of investment and the consumption difference to raw water
It is very greatly different.For example, the RO film dosages of two-stage RO techniques, will be 2.5 times or so of level-one RO technique film dosages, the RO of discharge is dense
Water is also higher by more than 50% compared with the latter.Prior, to considerable use " exchange of level-one RO- mixed bed ions ", technique was both
For having the high-purity water system of industry, since pre-treatment is only level-one RO, producing water water quality is difficult to the inflow requirement for meeting EDI, leads
Causing cannot be directly using the mixed bed ion switching equipment in EDI replacements downstream；And if upstream RO techniques are transformed, upgraded
For two-stage RO, then investment is not only dramatically increased, but also does not often also possess transformation condition in place etc..Therefore, although
EDI belongs to more advanced, efficient and environmental-friendly advanced desalination technology, but its share in Purewater Technique market in theory
Still less than 10%.The situation that mixed bed ion switching technology occupies about 90% market share is difficult to change always.As it can be seen that continuing pair
Conventional EDI technologies optimize development, relax its influent quality requirement so that its be resistant to most level-one RO production water and
Direct high purity water has highly important society, economy and environmental benefit, anticipates to the future of Purewater Technique with milestone
Justice.
Patent CN105198133A discloses a kind of ultrapure water production system and method for preventing electric deionizer fouling,
It is mainly made for the treatment of nature water system, counter-infiltration system, electrodeionization system.By increasing additionally dense in this technique
Water treatment system realizes antiscale purpose, and concrete operations are sequentially connected demineralizer and precision for the water outlet of EDI concentrated waters by a water pump
Filter, concentrated water that treated carry out alone cycle；Concentrated water cyclic system is controlled by the cation exchange resin in external water softener
Hardness ions in system and prevent the fouling of concentrated water room.This method not only increases system investments and operation energy consumption, improves technique
Numerous and diverse degree, key in the fouling in it actually can not effectively prevent concentrated water room.Once this is because shape in concentrated water room
Into fouling, EDI devices are not discharged with current, but accumulated in concentrated water room.The main purpose of the technique is to realize
The part of concentrated water recycles, and can not prevent that fouling is generated in EDI because of possible higher hardness in raw water.Actually should
In, also there is the risk of softening resin replacement not in time.
United States Patent (USP) US6056878 is then prevented using the method for antisludging agent is added into concentrated stream and electrode water in EDI
Portion's fouling；Method is then the pH value for adjusting EDI raw waters used by patent EP0916620 and US6017433, by into raw water
Acid medicine is added to prevent fouling.Add the desalination principle that antisludging agent and raw water acid adding are consumed with EDI without extra chemicals
It disagrees, and so that operation process is more responsible, also increase cost of investment.
Patent CN101195081A discloses a kind of method and apparatus for preventing scaling in electrodeionization units, leads to
The mode of overrich fresh water whole process adverse current so that the metal cation that concentrated water room is just migrated into from freshwater room can be by concentrated stream
Device is taken out of so as to prevent fouling.In the patented technology, fresh water and concentrated water are the type of flow of one section of level-one, but its current side
To opposite.This deep or light water mutually in adverse current water flow mode cause residence time of the metal ion in the concentrated water room of EDI compared with
The mode of deep or light water fair current greatly shortens, to preventing fouling advantageously.
However, the conventional EDI technologies including above-mentioned patented technology, also there are the general character passes that some not yet achieve a solution
Key problem, these problems are mostly related with the Water flow-path design inside EDI.One problem is that most existing business EDI technologies are adopted
It is designed with one section of Water flow-path of level-one, i.e., fresh water enters with concentrated water raw water or from bottom of device, by the long flow path of a partition plate
After degree, just discharged from top；Or in contrast, arranged after entering from top after the operation length of a partition plate from bottom
Go out.In this design, the current in the diluting compartment of multiple parallel connections after the desalting processing of a compartment, are expelled directly out compartment；
It is the water outlet of whole device after the lightening products water mixing of multiple compartments.Since ultra-pure water requires ion concentration therein necessary
The extremely low level of micrograms per litre rank, if therefore there is the current desalination in some compartment to be not thorough, have it is a small amount of do not remove from
Son discharge compartment then just directly affects the producing water water quality of whole device；On the other hand, if certain fluctuation occurs for water inlet raw water
When, as electrical conductivity from below 5 μ S/cm improve to 10 μ S/cm levels when, due to lacking enough regeneration mixed bed buffering area, produce water
Resistivity can be directly reduced to from more than 15M Ω cm below 5M Ω cm.This illustrates that existing EDI technologies are improving tolerance water inlet
There is apparent deficiency in terms of the fluctuation of salt content and the stability of desalination processes.
Another problem of existing EDI technologies is related with electrode water system, and the problem is directly related to entire water process
The security of system.In the existing EDI technologies of majority including above-referenced technology, the current in electrode chamber are final
It is mutually mixed with concentrated stream, this is favourable for the facility of design and assembling, the production of device, but it is negative to bring other
Face is rung.For example, oxidation reaction can occur in cathode chamber, the Cl in water-Ionic valence condition raises, and becomes Cl2Gas, goes forward side by side one
Step, which is dissolved in the water, generates HCl, HClO and NaClO.In this series of reaction process, product is all the very strong oxidation of destructive power
Agent seriously affects the service life of resin and film.And in practical applications, since the condensed water of EDI is not generally in line, but recycle
To the water inlet of upstream RO, due to wherein containing the electrode water lumped together, then Cl therein is brought by electrode water2, hypochlorous acid
HClO, sodium hypochlorite NaClO will be to the polyamide RO films of resistance to oxidation do not play destruction completely.In order to avoid this to whole
The destruction of a water treatment system, and need to add reproducibility medicament such as NaHSO again before RO films3, Cl is neutralized using it2、
HClO and NaClO.This adds inconvenience to practical application, because it is difficult to accurately hold chlorine caused by electrode reaction and
Hypochlorous amount, thus can only in the feed water flow of RO films excessive addition reproducibility medicament, so as to additionally increase desalination burden.
The electrode water of EDI is that the flow of electrode water and pressure cannot be separately adjustable with another potential risk that condensed water mixes,
But it is distributed automatically depending on the number of electrode water partition plate and concentrated stream partition plate.This may cause specifically running compared with high workload electric current
Under the conditions of, electrode water flow is relatively low and is not enough to the heat that electrode reaction generates discharging EDI membrane stacks in time, so as to certain
After run time accumulation, because accumulation of heat, electrode room temperature improve the water flow partition board deformation so that corresponding plastic material, to whole
A EDI membrane stacks device band carrys out high risks.In view of this, completely self-contained electrode water piping system is designed, minute quantity is contained
The electrode water and the dense of EDI, fresh water stream of harmful substance are mutually isolated, and individually discharge is to improving EDI and entire water treatment system
Operation stability is favourable.
As it can be seen that existing EDI technologies are not yet capable of providing a feasible technical solution so that it can effectively relax into water
Hardness limits, and improves the operation stability of the resistance to raw water quality fluctuation of EDI simultaneously, and provides and can be completely independent, isolate
Electrode water lines, to ensure the safety in operation of EDI and entire water treatment system.
Utility model content
The utility model is directed to the deficiency of above existing electrodeionization technology, provide it is a kind of be both suitable for 5-10mg/L compared with
High rigidity flow condition, while influent quality fluctuation is more tolerant of, possess completely self-contained electrode water system, have both high ant-scaling
With high stable desalting performance, the electric deionizing method and device of more stable, the safe reinforcing antiscale of operation.The utility model provides
EDI desalting technologies core thinking, be that the fresh water stream of EDI is designed as two sections of level-one, and concentrated stream is then one section of level-one, and
In the first segment flow of fresh water stream, dense, fresh water stream is mutually adverse current.This aspect causes hardness ions and OH-、CO3 2-Deng from
Son inside EDI into being difficult to combine, alternatively, having been discharged EDI modules before it is not yet combined；On the other hand, EDI
Fresh water stream is level-one two-piece design so that entire fresh water realizes between one, two section of EDI and remixes and reallocated
Journey, this can fundamentally improve the stability of operation, be advantageous to the fluctuation of tolerance influent quality.In addition, by special
The design of electrode sheet frame so that electrode water completely with it is dense, fresh water stream is mutually isolated, so as to utmostly avoid to EDI and entire
The damaging influence of water treatment system.
Wherein, in the electric deionizing method of above-mentioned reinforcing antiscale, the fresh water is referred to by the way of two sections of level-one：It is light
Water, which is intake, to be imported by the upper end fresh water hole of one side electrode plate in each light water flow partition board of deionized membrane stack fresh water stream first segment, directly
It is prevented to arrival fresh water commutation partition plate and carries out current commutation, the water (flow) direction in fresh water stream first segment is from top to bottom；Fresh water
Each light water flow partition board water outlet for flowing first segment re-mixes in interconnected fresh water hole, and into the after redistributing automatically
In two sections of each light water flow partition board, from bottom to top, last fresh water outlet is from opposite side electrode plate for water (flow) direction in second segment
The fresh water hole export at end.
Wherein, in the electric deionizing method of above-mentioned reinforcing antiscale, the fresh water is referred to by the way of two sections of level-one：It is light
Water, which is intake, to be imported by the lower end fresh water hole of one side electrode plate in each light water flow partition board of deionized membrane stack fresh water stream first segment, directly
It is prevented to arrival fresh water commutation partition plate and carries out current commutation, the water (flow) direction in fresh water stream first segment is from bottom to top；Fresh water
Each light water flow partition board water outlet for flowing first segment re-mixes in interconnected fresh water hole, and into the after redistributing automatically
In two sections of each light water flow partition board, from top to bottom, last fresh water outlet is under opposite side electrode plate for water (flow) direction in second segment
The fresh water hole export at end.
Between two sections, current, which realize, to be remixed and reallocates：The water outlet of each partition plate is being interconnected in first segment
Fresh water hole composition water stream channel in re-mix, then again mean allocation enter in each partition plate of second segment；In addition,
If necessary, the water inlet of concentrated stream can be distributed offer by fresh water outlet, remaining fresh water outlet then enters production water for ultrapure product water
Case.
Wherein, in the electric deionizing method of above-mentioned reinforcing antiscale, the concentrated water is referred to by the way of one section of level-one：It is dense
Water water inlet imports electricity by the concentrated water hole of one side electrode plate lower end or upper end (depending on the water (flow) direction of fresh water stream in the first paragraph)
Deionization membrane stack is evenly distributed in interconnected concentrated water hole in each enriched chamber's partition plate on each partition plate, from bottom to top or certainly
Each enriched chamber's partition plate is above flowed through lowerly, is directly exported by the corresponding concentrated water apopore of the electrode plate other end；Wherein, each concentrated water
The water (flow) direction flowed in partition plate is opposite with the direction of fresh water stream in fresh water stream first segment.
Wherein, in the electric deionizing method of above-mentioned reinforcing antiscale, the method further includes independent electrode water disengaging mode,
Which refers specifically to：Pole water water inlet is imported the electrode chamber of the side by the electrode water inlet opening of one side electrode plate lower end, at this
EDI membrane stacks are discharged in lateral electrode room upper end, and further pass through another electrode water hole of the lateral electrode plate lower end through external pipe
Reenter EDI membrane stacks, through all dense, light water flow partition boards on corresponding position electrode water hole, opposite side is entered by lower end
Electrode chamber passes through corresponding another electrode water in the electrode water hole of opposite side electrode chamber upper end and whole dense, light water flow partition boards
Hole returns, final to discharge EDI membrane stacks.
Wherein, in the electric deionizing method of above-mentioned reinforcing antiscale, the electrode water is under in the flow direction of positive and negative pole room
On and, so as to which the various gases for being conducive to electrode reaction generation effectively discharge EDI membrane stacks.
The device of the electric deionizing method provided by the utility model for implementing above-mentioned reinforcing antiscale, including in order successively
The positive plate that is stacked, cathode chamber partition plate, the n groundwork unit repeated, 1 fresh water is substituted with fresh water commutation partition plate
Flow the groundwork unit, the m groundwork unit repeated, 1 base that concentrated stream partition plate is substituted with anode chamber partition plate of partition plate
This working cell and negative plate；The groundwork unit by from anode to the anion-exchange membrane in cathode direction successively closed assembly,
Light water flow partition board, cation-exchange membrane and concentrated stream partition plate are formed；N, m is integer and n >=m >=1.
Wherein, in the electric deionizer of above-mentioned reinforcing antiscale, the positive and negative of the light water flow partition board are equipped with reinforcing rib
And seal groove.
Further, seal groove is additionally arranged at the outer periphery of whole water flow holes and to filling ion-exchange resin
Central cavity outer periphery.
Wherein, clamping plate is matched somebody with somebody in the outside of the positive/negative plate at the electric deionizer both ends of above-mentioned reinforcing antiscale, and using spiral shell
Bar fastens whole device.
Wherein, the electric deionizer of above-mentioned reinforcing antiscale, when using positive plate as fresh water influent side electrode plate, cathode
Plate is then used as fresh water outlet lateral electrode plate.
Wherein, the electric deionizer of above-mentioned reinforcing antiscale, when using positive plate as fresh water outlet lateral electrode plate, cathode
Plate is then used as fresh water influent side electrode plate.
Wherein, in the electric deionizer of above-mentioned reinforcing antiscale, one end of the fresh water influent side electrode plate is equipped with fresh water
Inlet opening；One end of the fresh water outlet lateral electrode plate is equipped with fresh water outlet hole, concentrated water apopore, pole water apopore, dynode
Water leadout hole is equipped with concentrated water inlet opening, pole water inlet opening and dynode water entrance hole in the other end of fresh water outlet lateral electrode plate.
Compared with prior art, the present invention has apparent advantage and advantageous effect, embodies in the following areas：1、
By two sections of fresh water stream level-one, one section of concentrated stream level-one inside EDI devices, and dense, fresh water stream is in the first segment of fresh water stream
Unique construction and the Water flow-path design of adverse current effectively prevent the internal fouling when generating precipitate metal hydroxides, significantly put
Wide water inlet stiffness conditions limitations；2nd, fresh water stream is level-one two-part flow so that current can occur again in first and second section
Mixing and reallocation effect, make EDI possess more stable desalting performance, the fluctuation into water salt content are more tolerant of, relatively
It is high into can still stablize high purity water under the conditions of water conductivity；3rd, possess completely self-contained electrode water piping system, electrode water
With it is dense, fresh water stream is completely isolated, avoid destruction of harmful electrode reaction to EDI devices and entire water treatment system；4th, fresh water
Stream partition plate positive and negative are equipped with the reinforcing rib of large area distribution and place the seal groove of O-ring seal, and electrode plate is towards membrane stack
Corresponding O-ring seal groove is also equipped on medial surface, between partition plate and amberplex, between partition plate and partition plate, partition plate with
Good airproof performance between electrode plate can thoroughly prevent from altering leakage in current；
Description of the drawings
Fig. 1 is a kind of internal water flow diagram of existing EDI technologies；
Fig. 2 is a kind of internal water flow diagram of the electric deionizing method of reinforcing antiscale provided by the utility model；
Fig. 3 is another internal water flow signal of the electric deionizing method of reinforcing antiscale provided by the utility model
Figure；
Fig. 4 is that the ion in the groundwork unit of the electric deionizing method of reinforcing antiscale provided by the utility model moves
Move, prevent the principle schematic of fouling；
Fig. 5 is a kind of electrode water idiographic flow signal of electric deionizing method for strengthening antiscale provided by the utility model
Figure；
Fig. 6 is the closed assembly schematic diagram of the electric deionizer of reinforcing antiscale provided by the utility model；
Fig. 7 is the assembling schematic diagram of the electric deionizer of reinforcing antiscale provided by the utility model；
Fig. 8 is the agent structure of the light water flow partition board of the electric deionizer of reinforcing antiscale provided by the utility model
Figure；
Fig. 9 is the flow chart of embodiment device provided by the utility model；
Figure 10 is that the production water resistance rate of embodiment provided by the utility model changes over time graph；
Figure 11 is that the ton water body energy consumption of embodiment provided by the utility model changes over time graph.
In figure, 1- positive plates, 2- negative plates, 3- anion-exchange membranes, 4- cation-exchange membranes, the water inlet of 5- fresh water, 6- are light
Water water outlet, the water inlet of 7- concentrated waters, the water outlet of 8- concentrated waters, the water inlet of 9- cathode chambers, the water outlet of 10- cathode chambers, the water inlet of 11- anode chambers, 12- cathode
Room water outlet, the water inlet of 13- poles water, the water water outlet of 14- poles, 15- groundworks unit, 16- anode chambers partition plate, the light water flow partition boards of 17-,
18- concentrated streams partition plate, 19- fresh water commutation partition plate, 20- cathode chambers partition plate, 21- reinforcing ribs, 22-O type circles seal groove, 23- raw waters
Case, 24- regulating valves, 25- water pumps, the online conductivity meters of 26-, 27- flowmeters, 28-EDI devices, 29- D.C. regulated power supplies, 30-
Online resistance rate instrument, 31-EDI water tanks.
Specific embodiment
The utility model is further described with reference to the accompanying drawings and examples.
A kind of electric deionizing method for strengthening antiscale provided by the utility model, this method include：Fresh water stream uses level-one
Two sections of Water flow-path mode, concentrated stream uses the Water flow-path mode of one section of level-one, and dense, fresh water is in the paragraph 1 of fresh water stream
Reverse flow；In addition, the electrode current of entire EDI devices with it is dense, fresh water stream is completely isolated, flow, pressure can be independent
It adjusts.
Fig. 1 is a kind of internal water flow diagram of existing EDI technologies.Fresh water stream, concentrated stream are one-part form stream in figure
Journey, two bursts of flow reversal flowings；Electrode water is mixed with concentrated stream, and the flow and pressure of electrode water cannot be separately adjustable.
Fig. 2 is a kind of internal water flow diagram of the electric deionizing method of reinforcing antiscale provided by the utility model,
Wherein fresh water raw water enters from side of the positive electrode, and n, m are 2；Fig. 3 is the electric deionizing method of reinforcing antiscale provided by the utility model
Another internal water flow diagram, wherein fresh water raw water from negative side enter, n, m are also 2.Involved by the utility model
Equal filling ion-exchange resin in the diluting compartments of EDI devices, enriched chamber and positive and negative electrode room, to fill uniform mixed bed tree in figure
It is illustrated exemplified by fat, specific filling Strategy can make the appropriate adjustments according to water quality treatment.
According to Fig. 2, fresh water water inlet 5 is imported by anode upper end enters paragraph 1, the 3rd light water flow partition board in paragraph 1
For the partition plate 19 that commutates, i.e. the top fresh water hole of the partition plate allows current to enter, but completely closed towards the water hole bottom of negative side,
So as to which current be forced to commutate.Water (flow) direction from top to bottom, connects in the fresh water hole of the 1st, 2 section of whole partition plate bottoms in paragraph 1
It re-mixes, and is redistributed automatically into the 2nd section of 3 light water flow partition boards in the 2nd section, water in the water stream channel of formation
Flow direction from bottom to top, last fresh water outlet 6 is exported from negative plate upper end.This design is so that the desalination stroke of fresh water stream is longer
More fully, even if desalting effect is insufficient in some compartment of paragraph 1, salinity can also be through the entrance that remixes, reallocates
It is thoroughly removed in 2nd section, so as to which device effluent quality will not be directly affected, drastically increases the resistance to raw water quality fluctuations of EDI
Operation stability.
In Fig. 2, fresh water outlet 6 distributes one as concentrated water water inlet 7, remaining is largely ultrapure product water.Concentrated water
Water inlet 7 is imported by negative plate lower end, is evenly distributed in each concentrated stream compartment, is flowed from bottom to top, concentrated water water outlet 8 is by negative plate
Upper end exports.The specific Principle of Scale Prevention of this design is as shown in Figure 4.In a groundwork unit 15, laterally born from anode
Pole side is anion-exchange membrane 3, diluting compartment, cation-exchange membrane 4, enriched chamber successively, wherein two strands of current are counter-current flow.It is former
Salt ion in water, including Ga2+、Mg2+Hardness ions, the i.e. lateral transfer under the action of DC electric field after diluting compartment is entered,
And enter adjacent enriched chamber through cation-exchange membrane 4, and in opposite direction flowing, the condensed water of only one section of short route
It can be taken out of EDI membrane stacks by stream within the shortest time；In addition, concentration polarization and water decomposition in diluting compartment mainly salt from
The downstream for the water (flow) direction that sub- concentration progressively reduces just acutely occurs, therefore water decomposition product H+、OH-Concentration be along fresh water
The direction of stream gradually increases, and including Ga2+、Mg2+Salt ionic concentration including hardness ions is gradual along the direction of fresh water stream
Reduce, this allows for the Ga of rather high concentration2+、Mg2+Hardness ions and OH-Ion cannot be formed at same Water flow-path position, it
Be respectively at the entrance and exit of fresh water stream.As it can be seen that in electric deionizing method provided by the utility model, hardness ions can
Rapid discharge EDI devices, and the hardness ions and OH of high concentration-Ion distribution is at the entrance and exit of fresh water stream, so as to most
Big degree avoids to form Mg (OH)2、Ga(OH)2Wait foulings precipitation.Dense, fresh water stream counter-flow pattern and concentrated water water inlet are by fresh water
The design method of shunting, similarly avoids CO3 2-Ion continues to build up in concentrated water flow, it is with Ga2+、Mg2+Ion is the same,
It can be quickly discharged outside EDI, therefore also avoid GaCO well3Fouling precipitation.Electricity provided by the utility model is gone
Ion method use two sections of fresh water level-one, the unique design that one section of concentrated water level-one, taken into account effective anti-scaling property and efficiently,
Stable desalting performance so that under the conditions of the higher raw water salt content of more existing EDI technologies, original water hardness, EDI still can be high
Effect steadily prepares ultra-pure water.
Fig. 5 is the schematic diagram of electrode water current in electrodeionization internal water flow shown in Fig. 3.Electrode water water inlet 13, by
The pole water hole of positive plate lower part enters, as anode water inlet 9.Since perforate of the anode partition plate at this causes electrode water only
Can be into anode partition plate, and at the pole water hole on positive plate top, be expelled directly out in a manner of anode water outlet 10.Anode water outlet 10
Through external connecting pipeline, EDI membrane stacks are entered by another pole water hole of positive plate lower part again, are horizontally through whole the lower partition
The reserved pole water hole of corresponding site, reach cathode partition plate as cathode intake 11, equally flowed from lower to upper in cathode partition plate,
Cathode water outlet 12 continues to be horizontally through the reserved pole water hole of whole partition plate tops corresponding site, another pole water from positive plate top
It sentences electrode water water outlet 14 and discharges EDI membrane stacks in hole.When electrode water is through the reserved pole water hole at position above and below each partition plate, due to
The sealing function of the O-ring on water hole periphery, electrode water and the dense of each partition plate, fresh water stream are completely isolated, will not also leak.
This design causes electrode water lines to be completely independent, and can regard scale, the size and water quality of whole device processing water of membrane stack,
By the opening and closings of external pump, flowmeter and respective valves flexibly, be independently adjusted its operating pressure and flow；It is in addition, positive and negative
Current in electrode chamber are the H for being from bottom to top conducive to electrode reaction generation2、O2、Cl2Wait the discharge of gases.These effects
Damaging influence of the electrode reaction noxious products to whole system is fundamentally prevented.Further, electrode water from anode to
Cathode serial communication can be such that the acidity of anode current is mutually neutralized with the alkalescence of cathode current, be also beneficial to improve anode chamber
Operational reliability.Positive and negative anodes water Natural communication inside membrane stack only has a small amount of connecting pipe, pole water outside the electrode plate of one side
Water-in and water-out in electrode plate one side, avoid traditional multiple, complicated exterior line connection mode, beneficial to entire EDI systems
The simplification of operation, arrangement and management.
Fig. 6 and Fig. 7 is respectively a kind of closed assembly signal of electric deionizer for strengthening antiscale provided by the utility model
Figure and assembling schematic diagram, in Fig. 7 each groundwork unit 15 equally containing each 1 cation-exchange membrane, anion-exchange membrane,
Light water flow partition board and concentrated stream partition plate, but order of arranging is to be followed successively by concentrated stream partition plate 18, anion exchange by anode to cathode
Film 3, light water flow partition board 17 and cation-exchange membrane 4.The device includes the positive plate 1, the anode that are stacked successively in order
Room partition plate 20, n repeatable 15,1 basic works that light water flow partition board 17 is substituted with fresh water commutation partition plate 19 of groundwork unit
Make unit, m repeatable 15,1 groundwork lists that concentrated stream partition plate 18 is substituted with anode chamber partition plate 16 of groundwork unit
Member and negative plate 2；
The groundwork unit 15 by from anode to cathode direction successively closed assembly anion-exchange membrane 3, fresh water stream every
Plate 17, cation-exchange membrane 4 and concentrated stream partition plate 18 are formed.N+m+2 groundwork unit 15 forms membrane stack, groundwork list
Member is also referred to as film pair.The quantity of motor-driven adjustment groundwork unit 15, it is possible to the processing water of adjustment equipment.In parallel is basic
The number of working cell 15 is more, and the water yield of EDI devices is bigger.
Specifically, the electric deionizer is at work, it is independent when fresh water raw water enters deionized membrane stack by negative side
Electrode water raw water by positive plate lower end electrode water water inlet import cathode chamber partition plate, cathode chamber partition plate upper end i.e. discharge electricity go
Ion membrane stack, and deionized membrane stack is further reentered by another electrode water hole of positive plate lower end through external pipe,
The electrode water hole of corresponding position, enters opposite side anode chamber partition plate by lower end, passes through cathode on through all dense, light water flow partition boards
Corresponding another electrode water hole returns in the electrode water hole of room partition plate upper end and all dense, light water flow partition board, final discharge electricity
Deionization membrane stack；Or when fresh water raw water enters deionized membrane stack by side of the positive electrode, independent electrode water raw water is by cathode chamber
The pole water hole of partition plate lower end imports, and is exported in the pole water hole of cathode chamber partition plate upper end, through all dense, light water flow partition board, cathode
The pole water hole of room partition plate and negative plate upper end exports, and is further entered through external pipe by the electrode water hole of negative plate lower end
Anode chamber partition plate finally discharges deionized membrane stack by another pole water hole of anode chamber partition plate and negative plate upper end.
Fig. 8 is a kind of main body knot of the diluting compartment partition plate of electric deionizer for strengthening antiscale provided by the utility model
Composition.It is shown in figure, the positive and negative of diluting compartment partition plate 17 are equipped with widely distributed reinforcing rib 21 and place O-ring seal
Seal groove 22.Between partition plate and amberplex, good airproof performance between partition plate and partition plate prevents from altering leakage in current.Difference every
The water hole of plate same position is interconnected, the closed corresponding water stream channel of composition under membrane stack impaction state by O-ring.
Fig. 9 is a kind of process flow chart of embodiment device provided by the utility model.It is shown according to flow in figure, it is former
First-stage reverse osmosis production water in water tank 23 additionally adds the CaCl of debita spissitudo again2、MgCl2Solution is made after regulating into the water hardness
Intake for EDI, through water pump 25 into EDI modules 28, flow of inlet water is controlled to adjust by flowmeter 27, into water conductivity by
Line conductivity meter 26 is monitored in real time.EDI fresh water productions water 6 is used as concentrated water water inlet 7 to enter dense outdoor except part, remaining all enters
Water producing tank 31, fresh water producing water water quality are detected by online resistance rate instrument 30.Pole water water outlet 15 and the directly outer row of concentrated water water outlet 8,
Concentrated water production water conductivity is detected by online conductivity meter.D.C. regulated power supply 29 provides direct current for entire EDI modules.
Embodiment
In the example, EDI devices use two sections of fresh water level-one, the frame mode that one section of concentrated water level-one, containing 10 basic works
Make unit.Diluting compartment partition plate specification is 668mm × 330mm × 10mm, concentrated stream and electrode chamber partition plate specification be 668mm ×
330mm × 4.9mm, effective membrane area of each partition plate is 888cm2.The number of the groundwork unit, i.e. film pair of EDI membrane stacks
For 10.Amberplex used in EDI is the special heterogeneous ion-exchange membranes of EDI, is produced by Hangzhou Ai Er Environmental Protection Technology Co., Ltd；
Ion exchange resin is the Marathon cation exchange resins (Na of DOW companies production+Type) and Marathon anion exchanges
Resin (Cl-Type).The volume ratio of yin, yang resin is 1 in whole compartments:1.
Ca in raw water box 232+Ion concentration is 1.71mg/L, mg2+Ion concentration is 0.78mg/L.According to based on CaCO3
The hardness conversion formula of calculating, then the calcium hardness in raw water be 1.71* (100/40), i.e., 4.275, and magnesium hardness be 0.78*
(100/24.4), i.e., 3.223, then total hardness is 7.5mg/L (with CaCO3Meter).The raw water is produced water for level-one RO and is additionally added
CaCl2And MgCl2Salting liquid is prepared and obtained, and produces water to simulate the RO of higher hardness, electrical conductivity is 17.5 μ S/cm.
Fresh water flow of inlet water is 1m3/ h, fresh water outlet shunting 0.2m3The flow of/h as concentrated water intake, lightening products water and
The flow of condensed water is respectively then 0.8m3/ h and 0.2m3/h.Electrode water is intake by directly being provided in raw water box, flow 60L/h.
The operating current of initial stage adjustment EDI is 1.6A, after running 10h under galvanostatic conditions, lightening products water resistance rate
15.0M Ω cm are gradually increased to by 0.1M Ω cm, are persistently raised thereafter, are stablized between 16.0-17.6M Ω cm.About
After 100h, the operating current of EDI is properly increased as 1.8A, hereafter continuous service.In accumulative 500h, it is equal to fade out water resistance rate
To stablize between 16.0-17.5M Ω cm (as shown in Figure 10), corresponding membrane stack operating voltage is persistently increased by initial 20V,
It is final to stablize in 40V.This be by EDI processes anion-exchange membrane and anion exchange resin with the passage of run time,
Under the working condition of water decomposition, partial function group quaternary ammonium group occurs caused by tertiary-aminated degradation institute nature.With the work under stable state
Make voltage 40V, operating current 1.8A, fresh water production water 0.8m3/ h is calculated, and the ton water body energy consumption of EDI is by initial in the embodiment
0.04kWh step up, finally stabilize to 0.09kWh (as shown in figure 11).Relatively existing commodity EDI technologies and product
0.15-0.3kWh/m3Normal energy consumption for, it is seen that electric deionizing method provided by the utility model also has significant energy saving
Effect.
In the present embodiment, EDI's has reached 7.5mg/L (with CaCO into the water hardness3Meter), more existing EDI is into the water hardness
Common demands will much relax less than 1.0mg/L.Estimation is guarded to the steady removal rate 99% of hardness ions in water with RO films,
The Ca of its upstream RO raw water allowed2+Ion concentration can reach 170mg/L, while also allow the mg for having 78mg/L2+Ion is deposited
.For most city tap-waters, surface water and groundwater, the Ca in water2+、Mg2+Ion is substantially lower than this water
It is flat.Obviously, using only the pre-treatment that single-stage RO is EDI, production water hardness index is all in electrodeionization provided by the utility model
Within the processing capacity of method.It is necessary severe less than 1mg/L into the water hardness for existing EDI technologies for another angle
Requirement is carved, such as when RO production water contains the Ca of 0.4mg/L2+Ion, alternatively, the Ca containing 0.3mg/L simultaneously2+And 0.063mg/L
Mg2+During ion, total hardness is just up to 1.0mg/L.Equally using single-stage RO as pre-treatment, RO films are to the steady removal of hardness
Rate is also in terms of 99%, it is clear that when preparing ultra-pure water using the integrated technique of " the existing EDI of RO/ ", handled by raw water in it is necessary
Contain the Ca no more than 40mg/L2+Ion contains the Ca for being no more than 30mg/L respectively simultaneously2+The Mg of ion and 6.3mg/L2+
Ion or the combination with this other comparable calcium ions and magnesium ions.As it can be seen that most of tap water, surface water and groundwater
For, this is all implacable condition.In the present embodiment, electric deionizing method provided by the present invention so that entire water
The more existing EDI technologies of hardness number of raw water and upstream RO production water handled by processing system relax 7.5 times, and to majority certainly
For water, surface water and groundwater, all so that preparing ultra-pure water with the integrated technique stabilization of " single-stage RO/EDI " possesses reality
Feasibility.This is to the production of the pure water, ultra-pure water of numerous industrial departments such as electric power, electronics, bio-pharmaceuticals, really promoting the use of
EDI this green, cleaning, environmental-friendly membrane technology, save significantly on upstream UF, RO film dosage, save RO concentrated water drainages all
It is of great significance.
The above is only the preferred embodiment of the utility model, it is noted that for the general of the art
For logical technical staff, on the premise of the utility model principle is not departed from, several improvement can also be made, are included but not limited to
It is to change from top to bottom or from bottom to top, suitably in diluting compartment and enriched chamber to change water (flow) direction in two sections of fresh water streams of EDI
Yin and yang resin ratio, the particle size range of institute's filling ion-exchange resin in suitable control diluting compartment and enriched chamber, directly with RO
Water is produced as the raw water of concentrated water and electrode water or completely by fresh water outlet shunting as concentrated water and the raw water of electrode water etc., these
It improves within similarly belonging to the scope of protection of the present invention.
Claims (6)
1. a kind of electric deionizer for strengthening antiscale, which is characterized in that the device includes what is be stacked successively in order
Positive plate, cathode chamber partition plate, the n groundwork unit repeated, 1 the basic of light water flow partition board is substituted with fresh water commutation partition plate
Working cell, m repeat groundwork unit, 1 with anode chamber partition plate substitute concentrated stream partition plate groundwork unit and
Negative plate, n, m are integer and n >=m >=1, and the groundwork unit is by from anode to the anion in cathode direction successively closed assembly
Exchange membrane, light water flow partition board, cation-exchange membrane and concentrated stream partition plate are formed.
A kind of 2. electric deionizer for strengthening antiscale according to claim 1, which is characterized in that the light water flow partition board
Positive and negative be equipped with reinforcing rib and seal groove.
3. a kind of electric deionizer for strengthening antiscale according to claim 1, which is characterized in that whole device both ends
Clamping plate is matched somebody with somebody in the outside of positive/negative plate, and is fastened whole device using screw rod.
4. it is according to claim 1 it is a kind of strengthen antiscale electric deionizer, which is characterized in that when using positive plate as
During fresh water influent side electrode plate, negative plate is then used as fresh water outlet lateral electrode plate.
5. it is according to claim 1 it is a kind of strengthen antiscale electric deionizer, which is characterized in that when using positive plate as
During fresh water outlet lateral electrode plate, negative plate is then used as fresh water influent side electrode plate.
6. it is according to claim 4 or 5 it is a kind of strengthen antiscale electric deionizer, which is characterized in that the fresh water into
One end of water lateral electrode plate is equipped with fresh water inlet opening；One end of the fresh water outlet lateral electrode plate is equipped with fresh water outlet hole, concentrated water
Apopore, pole water apopore, dynode water leadout hole are equipped with concentrated water inlet opening, pole in the other end of fresh water outlet lateral electrode plate
Water inlet opening and dynode water entrance hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721260179.XU CN207435163U (en) | 2017-09-28 | 2017-09-28 | A kind of electric deionizer for strengthening antiscale |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721260179.XU CN207435163U (en) | 2017-09-28 | 2017-09-28 | A kind of electric deionizer for strengthening antiscale |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207435163U true CN207435163U (en) | 2018-06-01 |
Family
ID=62294963
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721260179.XU Active CN207435163U (en) | 2017-09-28 | 2017-09-28 | A kind of electric deionizer for strengthening antiscale |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207435163U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107555619A (en) * | 2017-09-28 | 2018-01-09 | 天津中领水系统技术有限公司 | A kind of electric deionizing method and device for strengthening antiscale |
-
2017
- 2017-09-28 CN CN201721260179.XU patent/CN207435163U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107555619A (en) * | 2017-09-28 | 2018-01-09 | 天津中领水系统技术有限公司 | A kind of electric deionizing method and device for strengthening antiscale |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9162906B2 (en) | Method for desalinating saltwater using concentration gradient energy | |
| JP3794268B2 (en) | Electrodeionization apparatus and operation method thereof | |
| JP3385553B2 (en) | Electric deionized water production apparatus and deionized water production method | |
| CN106630040A (en) | Selective bipolar membrane electrodialysis system and application thereof | |
| CA2459840A1 (en) | Apparatus for electrodeionization of water | |
| CN105198133A (en) | Ultra-pure water preparation system and method capable of preventing electrodeionization device from scaling | |
| CN106315935B (en) | Water quality desalting plant and the method for desalinating water quality using the device | |
| CN107555619A (en) | A kind of electric deionizing method and device for strengthening antiscale | |
| CN101007663A (en) | Electrodeionization water-purifying device and method for recovering cation and anion without scaling | |
| CN111954568B (en) | Saline water recovery system based on bipolar membrane | |
| CN101723491A (en) | Electrodeionization method and device for basic working unit containing three compartments | |
| KR101066939B1 (en) | Electric deionization apparatus and method of operating the same | |
| CN108298644A (en) | A kind of efficient waste water salt separation concentrating and desalinating integrated apparatus | |
| Liu et al. | Energy-saving “NF/EDR” integrated membrane process for seawater desalination. Part II. The optimization of ED process | |
| CN207435163U (en) | A kind of electric deionizer for strengthening antiscale | |
| CN104909503B (en) | A kind of integrated membrane process method for desalting seawater | |
| CN114014415A (en) | Continuous regeneration deionization cation exchanger and anion exchanger system by using direct-current power supply | |
| CN108793522A (en) | A kind of desulfurization wastewater concentration decrement process | |
| JP2008036473A (en) | Electric deionizer | |
| CN101671070B (en) | Electric deionizing method and device containing protective water flow | |
| CN208667184U (en) | A kind of efficient waste water salt separation concentrating and desalinating integrated apparatus | |
| CN216614124U (en) | Continuous regeneration deionization cation exchanger and anion exchanger system by using direct-current power supply | |
| JP3695338B2 (en) | Method for producing deionized water | |
| JP4505965B2 (en) | Pure water production method | |
| CN201037122Y (en) | Counter current type electricity desalination equipment |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |