CN106422794A - Cleaning system and method for filter membrane used in membrane-method sea water desalination - Google Patents
Cleaning system and method for filter membrane used in membrane-method sea water desalination Download PDFInfo
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- CN106422794A CN106422794A CN201610721842.5A CN201610721842A CN106422794A CN 106422794 A CN106422794 A CN 106422794A CN 201610721842 A CN201610721842 A CN 201610721842A CN 106422794 A CN106422794 A CN 106422794A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/10—Energy recovery
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
Abstract
The invention provides a cleaning system and method for a filter membrane used in membrane-method sea water desalination, and belongs to the technical field of sea water desalination. The cleaning system for the filter membrane used in membrane-method sea water desalination comprises a reverse osmosis membrane separation device and an energy recycling device. The system is characterized in that a solar power system, an electrolysis tank and a water pump are further included, wherein electrodes are arranged in the electrolysis tank, and the solar power system supplies direct-current electric energy to the electrodes; a concentrated sea water discharge port of the reverse osmosis membrane separation device is connected to a concentrated sea water input port of the energy recycling device, and a concentrated sea water output port of the energy recycling device is connected to the electrolysis tank to supply concentrated sea water to the electrolysis tank; a pipeline connected to a water inlet of the water pump stretches into the electrolysis tank to draw electrolyte; a water outlet of the water pump is connected to a fresh water port of the reverse osmosis membrane separation device. According to the cleaning system and method for the filter membrane, the concentrated sea water generated in a membrane-method sea water desalination system is electrolyzed through solar energy to generate a chemical preparation for cleaning the filter membrane, and therefore generation cost and energy are reduced.
Description
Technical field
The present invention relates to filter membrane purging system in a kind of Membrane seawater desalination, more particularly, to a kind of using natural energy resources and
Natural object produces the filter membrane purging system of abluent.
Background technology
People have extensively carried out utilizing hydrophobic filter film（As hollow-fibre membrane）Membrane filtration, to remove sea water, discharge
Float included in water, water ballast etc..However, in the seawater, there is about 1ppm to some ppm is referred to as TEP（Transparent
Extracellular polymer composition granule）Stickum, this stickum is to extracellular by plankton and microorganism secretion.TEP
Comprise saccharide as its main component, and the deformable particle for respectively about 1 μm to 200 μm of particle diameter.The organic granulars such as TEP
（I.e. colloidal suspensions）Can deform.Therefore, when membrane filtration is carried out to the accessing pending water containing these colloidal suspensions, glue
Shape float can be adhered to the inside on film surface and hole and extend, thus easily causing the pollution in hole（Blocking）.
In comprising the membrane filtration of accessing pending water of this colloidal suspensions, when using by hydrophobic material（As fluororesin
Or polyethylene）Make and when aperture is more than about 1 μm of filter membrane, occur the probability of blocking to tend to reducing, and, processing stream
Speed extends in time and reduces（Or filter pressure extends in time and increases）Amplitude less.With hydrophilic filter film phase
It appears that colloidal suspensions are not easy to be adhered to and have wide-aperture hydrophobic filter film, therefore blocking is suppressed ratio.Thus
There is relatively wide-aperture hydrophobic filter film and be suitable for sea water, the membrane filtration of discharge water and water ballast etc..
Even if however, when using this filter membrane, also cannot fully prevent the blocking of filter membrane, processing the fall of flow velocity
The rising of low and filter pressure.Accordingly, it would be desirable to clean filter membrane during membrane filtration to recover to process flow velocity in good time（Or mistake
Filtering pressure power）, and need to clean and remove by the float of hole plug.
As the method for cleaning filter membrane, it is widely used and so that water is led to along the direction contrary with the liquor stream in filter process
The method of filter membrane（Hereinafter referred to as " back washing making liquid carry out by film " or " back washing "）.Additionally, also using
Physical cleaning etc., the method such as cleaning film by injected chemical solution（Chemical solution cleans）, the side of Manual-cleaning filter membrane
Method, make gas along and the cleaning method by filter membrane for the contrary direction of liquor stream during filtering（Air back washing）, by film
Apply the cleaning method of ultrasound wave（Ultrasound wave cleans）.In order to improve cleaning efficiency further it is also known that by said method in addition
The cleaning method of combination.
For example, disclosing one kind in prior art makes filter assemblies regeneration method, wherein, in order to fine using hollow
While the filter assemblies of dimension film apply mechanical vibration, back washing water is made to pass through described filter assemblies and shake in described assembly
Water, the deposit that thus will attach to filtering surface is peeled off and is gone out described deposit, suitably in supply and the row of back washing water
Switch between going out, so that the water level in described assembly changes along hollow fiber bundle ".When the heap being difficult to stripping attachment
During long-pending thing, in order to strengthen cleaning performance, can by the aqueous solution of hydrochloric acid, citric acid, oxalic acid, hypochlorous acid and synthetic detergent individually or
It is applied in combination using as back washing water.But above-mentioned substance, all from being bought by desalinization producer, increased production cost.
Content of the invention
For overcome prior art exist shortcoming, the present invention provide a kind of Membrane seawater desalination in filter membrane purging system and
Method, concentrated seawater is electrolysed by it using solar energy, thus producing the chemicals of clear filter membrane, has saved production cost.
For realizing described goal of the invention, the present invention provides filter membrane purging system in a kind of Membrane seawater desalination, and it includes
Reverse osmosis membrane separation device and energy recycle device it is characterised in that also including solar power supply system, electrolytic cell and water pump,
Wherein, it is provided with electrode in electrolytic cell, solar power supply system provides direct current energy to electrode；Reverse osmosis membrane separation device dense
Sea water outlet is connected to the concentrated seawater input port of energy recycle device, and the concentrated seawater delivery outlet of energy recycle device is connected to electricity
Solution tank, for providing concentrated seawater to electrolytic cell；The pipeline being connected with the water inlet of water pump is stretched into and takes electrolytic cell to be used for drawing electrolysis
Liquid；The outlet of water pump is connected to reverse osmosis membrane separation device fresh water mouth.
Preferably, in Membrane seawater desalination, filter membrane purging system also includes vaporizer, and described vaporizer is arranged at energy
Between the concentrated seawater delivery outlet of retracting device and electrolytic cell, for concentrated seawater is concentrated further.
Preferably, filter membrane purging system in Membrane seawater desalination, also includes condenser, and described condenser is used for evaporation
The vapor that device is discharged carries out being condensed into pure water.
For realizing described goal of the invention, this bright another aspect provides and filters Membrane cleaning side in a kind of Membrane seawater desalination
Method is it is characterised in that utilize the concentrated seawater that ionization device ionization is discharged from reverse osmosis membrane separation device, using the electrolyte of electrolysis
Back washing is carried out to reverse osmosis membrane separation device.
Preferably, convert the solar into electric energy to be supplied to ionization device.
Compared with prior art, filter membrane purging system and method in the Membrane seawater desalination that this provides, it is using too
Concentrated seawater can be electrolysed by sun, thus producing the chemicals of clear filter membrane, has saved production cost.
Brief description
Fig. 1 is the composition schematic diagram of filter membrane purging system in the Membrane seawater desalination that first embodiment of the invention provides；
Fig. 2 is the schematic diagram of the first composition of the energy recycle device that first embodiment of the invention provides；
Fig. 3 is the schematic diagram of the second composition of the energy recycle device that first embodiment of the invention provides；
Fig. 4 is the composition schematic diagram of filter membrane purging system in the Membrane seawater desalination that second embodiment of the invention provides；
Fig. 5 is the composition schematic diagram of filter membrane purging system in the Membrane seawater desalination that third embodiment of the invention provides;
Fig. 6 is the composition schematic diagram of filter membrane purging system in the Membrane seawater desalination that fourth embodiment of the invention provides.
Specific embodiment
Below in conjunction with accompanying drawing, technical scheme is clearly and completely described with the enforcement it is clear that described
Example is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of not making creative work, broadly falls into the scope of protection of the invention.
In describing the invention, it should be noted that term " " center ", " on ", D score, " vertical ", " level ",
The orientation of instruction such as " interior ", " outward " or position relationship are based on orientation shown in the drawings or position relationship, are for only for ease of and retouch
State the present invention and simplify description, rather than the device of instruction or hint indication or element must have specific orientation, with specific
Azimuth configuration and operation, be therefore not considered as limiting the invention.
In describing the invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " set
Put ", should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly " being connected ", " connection "
Connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, can also be the connection of two element internals, right
For those of ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood with concrete condition.
First embodiment
Fig. 1 is the composition schematic diagram of filter membrane purging system in the Membrane seawater desalination that first embodiment of the invention provides.As Fig. 1
Shown, by water pump（Not shown）The sea water obtaining is carried out pretreatment and is adjusted to the water quality of regulation by pretreatment unit 1
After condition, supply to the high-pressure pump 3 being driven by motor M via sea water supply pipe 2.The sea water being boosted by high-pressure pump 3 via
Drain pipe 4 is supplied to reverse osmosis membrane separation device 5.Sea water is separated into high dense of salt component concentration by reverse osmosis membrane separation device 5
Sea water and the low fresh water of salt component concentration and obtain fresh water from sea water.Now, the high concentrated seawater of salt component concentration is from reverse osmosis membrane
Segregation apparatuss 5 are discharged, but this concentrated seawater still has high pressure.Connect from the concentrated seawater outlet of reverse osmosis membrane separation device 5
In the first port of electric control reversing valve 11, the concentrated seawater that the second port of electric control reversing valve 11 is connected to energy recycle device 8 is defeated
Inbound port, the 3rd port of electric control reversing valve 11 is connected to cesspool by the road.The supply of the sea water that preprocessed device 1 is processed
Pipe 2 is connected to the sea water water inlet of energy recycle device in the upstream branch of high-pressure pump 3 via valve 10, and described valve 10 is
One-way water inlet valve, sea water can only flow into energy recycle device through valve 10.The energy of concentrated seawater can be turned by energy recycle device 8
It is changed to electric energy, and low pressure seawater can be made to boost.
In energy recycle device 8, the sea water boosted using concentrated seawater is supplied to booster 6 by valve 9, described
Valve 9 is single slope drainage valve, and the sea water of boosting can only spouting energy retracting device through valve 9.Sea water is entered one by booster 6
Step boosting collaborates high pressure for reaching the pressure with the drain pipe 4 phase same level of high-pressure pump 3, the sea water after boosting via valve 7
The drain pipe 4 of pump 3 and be fed into reverse osmosis membrane separation device 5.On the other hand, sea water is boosted and produced electric energy and lose
The concentrated seawater removing energy is discharged through concentrated seawater discharge pipe 12 from energy recycle device 8.
The seawater desalination system that the present invention provides also includes manostat 13 and DC/DC transducer 15, and energy recycle device produces
Raw electric energy input manostat 13, the direct current energy that energy recycle device produces is carried out voltage stabilizing, then exports straight by manostat 13
Stream voltage U1, the positive terminal of voltage U1 connects the positive pole of diode D1, and the negative pole of diode pole D1 connects DC/DC transducer 15
Power input, the purpose of setting diode D1 is to prevent when the voltage U1 of manostat output is relatively low, and charging charger Ec gives
Manostat provides the energy.
The seawater desalination system that the present invention provides also includes sun-generated electric power Sc, rechargeable battery Ec, charger 14, its
In, photovoltaic energy is converted to electric energy by sun-generated electric power Sc, and described photovoltaic energy is setting floatation type photovoltaic energy across the sea
Origin system, so not only can make full use of natural energy resources, can also save land resources.Charger 14 utilizes sun-generated electric power
Charge to rechargeable battery Ec, thus solar energy is stored rechargeable battery Ec.Charger 14 includes MPPT control circuit, setting
MPPT control circuit is in order to solar energy ceiling capacity is followed the tracks of.The cathode output end of charger 14 is just being connected to diode D2
Pole, the negative pole of diode D2 is connected to the positive pole of rechargeable battery Ec, and the cathode connecting diode D3 of rechargeable battery Ec is just
Pole, the negative pole of diode D3 connects the power input of DC/DC transducer, and the negative pole of rechargeable battery Ec connects common port, can fill
The output voltage of battery Ec is U2, and the purpose of setting D2 is to prevent rechargeable battery from providing the energy to charger.Setting D3
Purpose be in order to when manostat has stable voltage output, the DC voltage that manostat provides is changed by DC/DC transducer
For the various direct current energies needing, when the DC voltage of manostat output is not enough, rechargeable battery Ec is carried by DC/DC transducer
For DC voltage be converted to the various direct current energies of needs, i.e. the direct current energy of input is converted to various by DC/DC transducer
Direct current energy, such as+24V ,+48V ,+110V ,+220V, -24V, -48V, -110V, -220V etc..In the present invention,, such as
This, when the piezoelectric voltage that the unidirectional current that energy recycle device produces exports through manostat is in the working range of DC/DC transducer, just
Powered using the electric energy that energy recycle device produces, if the voltage of manostat 13 output is not in the work of DC/DC transducer 15
In the range of when, just powered with rechargeable battery Ec, so save the energy.
The seawater desalination system that the present invention provides also includes electrolytic cell 16, is provided with a pair of electrodes 19, described electrode in it
There is provided direct current energy using DC/DC transducer 15.Energy recycle device 8 concentrated seawater outlet is connected to entering of electric control reversing valve 18
The mouth of a river, the first discharge outlet of electric control reversing valve 18 connects leads in the inlet of electrolytic cell 16, the second discharge outlet of electric control reversing valve
It is connected to outer row water pipe, so, when the concentrated seawater in electrolytic cell 16 is discontented with, concentrated seawater is drained into electrolytic cell 16, works as electricity
When sea water in solution tank 16 is full of, concentrated seawater being discharged to the outside through electric control reversing valve 18 that energy recycle device is discharged.
When the electrode 19 in electrolytic cell 16 applies direct current energy, then there is following reaction in cathode electrode：
4H++4e-+(4OH-)→2H2+(4OH-)
And there is following reaction in anode electrode：
2H2O→4H++O2+4e-
Meanwhile, there is following reaction in the chloride ion containing in solution：
2Cl-→Cl2+2e-
In addition, this Cl2Reacted as follows with water：
Cl2+H2O→HClO+HCl.
Due to containing the sodium ion of non-lipid in concentrated seawater, therefore, by being energized to electrode 19 and to produce sodium hypochlorite molten
Liquid.When needing infiltration membrane separation device 5 is carried out, using liquor natrii hypochloritises, back washing is carried out to reverse osmosis membrane apparatus,
The deposit being difficult to peel off attachment can easily be removed.
In first embodiment, the relatively top of electrolytic cell 16 is provided with valve 22, when the concentrated seawater in electrolytic cell 16 is too full
When, can be able to be drained part concentrated seawater by valve 22.
The seawater desalination system that the present invention provides also includes booster 20, electric control reversing valve 17 and electrically-controlled valve 21, wherein, instead
The fresh water discharge outlet of infiltration membrane separation device 5 is connected to electric control reversing valve 17 first port by the road；Feed liquor with booster 20
The pipeline that mouth connects extend into the bottom in electrolytic cell；The liquid outlet of press pump 20 is connected to the second of electric control reversing valve 17 by the road
Port；3rd port of three-way valve 17 is connected to fresh water water tank or tank by the road.When needing to reverse osmosis membrane separation
When device 5 is carried out, so that the first port of electric control reversing valve 17 and second port is connected, make the first end of electric control reversing valve 11
Mouth and the 3rd port connect, and are thusly-formed purge path.Booster 20 extracts the solution in electrolytic cell, with to reverse osmosis membrane separation
Device 5 carries out back washing, and the sewage after back washing enters and takes in cesspool.
Fig. 2 is the schematic diagram of the first composition of the energy recycle device that first embodiment of the invention provides, as Fig. 2 institute
Show, Fig. 2 is that the energy recycle device 8 that the present invention provides includes the hydraulic turbine（In figure is not shown）, fluid cylinder 807, piston 808, connecting rod
806th, curved bar 805 and circle wheel 802, wherein, the water inlet of the hydraulic turbine is connected to the second port of electric control reversing valve 11；The hydraulic turbine
Discharge outlet is connected to concentrated seawater drain pipe 12；Piston 808 is movably set in fluid cylinder 807；One end of connecting rod 806 and piston 808
It is fixedly connected with；The other end of connecting rod is connected with the first end of curved bar 805；The axle 803 of the hydraulic turbine be fixed on circle wheel 802 center so that
During hydraulic turbine rotation, circle wheel also rotates with；Second end of curved bar 805 is movably connected on the connection in the deviation center of circle of circle wheel 802
On part 804, the bottom of fluid cylinder 807 is provided with seawater inlet port and high pressure sea water discharge outlet, is provided with valve at seawater inlet port
10, it is provided with one-way cock 9 at high pressure sea water discharge outlet；The discharge outlet of fluid cylinder is connected to the water inlet of high-pressure pump 6 through valve 9,
In described circle wheel 802, setting is cored, the iron core in circle wheel is provided with rotor windings, described energy recycle device 8 also wraps
Include the iron core 801 being enclosed in circle wheel exterior measuring and having gap and circle wheel between, the iron core 801 in circle wheel outside is provided with three groups of stators
Winding.First exit U of first stator winding1It is connected to the positive pole of diode D7, and be connected to the negative pole of diode D4；The
First exit V of two stator winding1It is connected to the positive pole of diode D8, and be connected to the negative pole of diode D5；3rd fixed
First exit W of sub- winding1It is connected to the positive pole of diode D9, and be connected to the negative pole of diode D6；Diode D7, D8 and D9
Negative pole link together, the positive pole of diode D4, D5 and D6 links together and is grounded, thus outwardly provide positive voltage.
Second exit U of first stator winding2Connect, second exit V of second stator winding2With the 3rd stator around
3rd exit W of group2Link together, thus three stator winding are connected into Y shape and connect.
The energy recycle device operation principle that the present invention provides is such, when starting working, if piston is placed in fluid cylinder
Bottom, adds DC voltage at this moment to the rotor windings on the iron core in circle wheel 802, now, rotor windings, create in coil
Magnetic field, according to left hand rule, one end of iron core is equivalent to N pole, and the other end is equivalent to S pole, now, is driving circle wheel when the hydraulic turbine
Rotate counterclockwise, in three windings of stator（I.e. coil）On induced alternating voltage, on first stator winding produce
Alternating voltage becomes DC voltage through diode D7 and D4 rectification；The alternating voltage producing on second stator winding is through diode
D8 and D5 rectification becomes DC voltage；The alternating voltage producing on 3rd stator winding becomes through diode D93 and D5 rectification
DC voltage；Outwardly power after three DC voltage parallel connections.After energy recycle device work, added direct current on rotor windings
Electricity can be by the rectified rear offer of induced voltage produced on stator winding.While water wheels locomotive drives circle wheel rotation,
Curved bar also and then rotates, and curved bar drivening rod moves up, and piston 808 moves to fluid cylinder top, and valve 10 is opened, and sea water injects
Fluid cylinder 807, when circle takes turns rotate counterclockwise 180 degree, piston 808 moves to topmost, and fluid cylinder 807 has filled sea water, then, circle
Wheel drives curved bar to continue rotate counterclockwise, and curved bar drivening rod moves down, and piston 808 moves to cylinder bottom, and valve 10 closes
Close, valve 9 is opened, the sea water in fluid cylinder 9 is added to the water inlet of high-pressure pump 6；During 360 degree of circle wheel rotate counterclockwise, piston 808
Move to the bottom of fluid cylinder, the sea water in fluid cylinder 808 is all for giving high-pressure pump 6.So circulate, same what sea water boosted
When, three stator winding create alternating current, described electric energy can give high-pressure pump supply portion electric energy.
Fig. 2 is the schematic diagram of the second composition of the energy recycle device that first embodiment of the invention provides, as Fig. 3 institute
Show, the energy regenerating that the second composition of the energy recycle device that first embodiment of the invention provides is provided with first embodiment fills
It to be only iron core in circle wheel that the first composition of putting is different and rotor windings are replaced by permanent magnet, so, from reverse osmosiss
The concentrated seawater that membrane separation device 5 is discharged creates mechanical energy, axle band circle wheel 802 rotation of the hydraulic turbine, circle wheel 802 band through the hydraulic turbine
Moving magnet rotates thus creating electric energy in three stator winding, and described electric energy can give high-pressure pump supply portion electric energy, circle
While wheel rotation, piston 808 runs in fluid cylinder, so that sea water is boosted.
Second embodiment
Fig. 4 is the composition schematic diagram of filter membrane purging system in the Membrane seawater desalination that second embodiment of the invention provides, such as Fig. 4
Shown, the seawater desalination system that seawater desalination system and first embodiment that second embodiment that the present invention provides provides are provided
Except that：Seawater desalination system also includes vaporizer 22 and condenser 21, loses energy by what energy recycle device was discharged
Sea water be connected to vaporizer 22 through two position three-way valve 18, be provided with adding thermal resistance coil in vaporizer 22（In figure is not shown）, plus
Thermal resistance coil provides electric energy by DC/DC transducer 15, and vaporizer 22, by concentrated seawater heating evaporation, improves the dense of sea water further
Degree.The drain pipe of vaporizer 22 is connected to electrolytic cell 16 through valve 23, and the steam outlet of vaporizer is connected to condenser 21, cold
Vapor cooling is obtained pure water by condenser.Sea water in vaporizer 22 is drained into electrolytic cell 16 after reaching setting concentration, electrolysis
Tank is electrolysed using the electric energy that DC/DC transducer provides, thus obtaining liquor natrii hypochloritises.Electrolytic cell 16 is connected by water pipe
In the water inlet of booster 20, the discharge outlet of booster 20 by the road, two position three-way valve 17 be connected to reverse osmosis membrane separation device 5
Water outlet, back washing is carried out to reverse osmosis membrane separation device 5 using liquor natrii hypochloritises.
3rd embodiment
Fig. 5 is the composition schematic diagram of filter membrane purging system in the Membrane seawater desalination that third embodiment of the invention provides, such as Fig. 5
Shown, the seawater desalination system that seawater desalination system and second embodiment that 3rd embodiment that the present invention provides provides are provided
Except that：Seawater desalination system also includes filter 24, described filter be arranged on two position three-way valve 18 and vaporizer
Between 22, it is mainly used in filtering the impurity in the sea water losing energy.
Fourth embodiment
Fig. 6 is the composition schematic diagram of filter membrane purging system in the Membrane seawater desalination that fourth embodiment of the invention provides, such as Fig. 6
Shown, the seawater desalination system that fourth embodiment of the invention provides is different only from the first seawater desalination system implementing to provide
It is, using cation exchange membrane 26 and anion exchange membrane film 25, electrolytic cell is divided into three rooms, in first indoor setting sun
Pole 19A, it provides positive polarity power supply by DC/DC transducer；The concentrated seawater discharge outlet of energy recycle device is connected by reversal valve
In the water inlet of second room, second room lower end is provided with fresh water delivery outlet；3rd interior is provided with negative electrode 19B, its by
DC/DC transducer provides negative polarity power supply.First Room and the 3rd Room are connected to reservoir 24 by valve and pipeline, with booster
The pipeline that water inlet is connected extend in reservoir 24 and is used for extracting solution to carry out back washing to reverse osmosis membrane separation device 5.
Above in association with accompanying drawing, the operation principle of the present invention is described in detail.But those of ordinary skill in the art should
Understand, description is only for explaining claims.But protection scope of the present invention is not limited to description.Any familiar
Those skilled in the art in the technical scope that the present invention discloses, the change that can readily occur in or replacement, all should contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by the protection domain of claims.
Claims (5)
1. filter membrane purging system in a kind of Membrane seawater desalination, it includes reverse osmosis membrane separation device and energy recycle device,
It is characterized in that, also include solar power supply system, electrolytic cell and water pump, wherein, in electrolytic cell, be provided with electrode, solar-electricity
Origin system provides direct current energy to electrode；The concentrated seawater outlet of reverse osmosis membrane separation device is connected to the dense of energy recycle device
Sea water input port, the concentrated seawater delivery outlet of energy recycle device is connected to electrolytic cell, for providing concentrated seawater to electrolytic cell；With water
The pipeline that the water inlet of pump connects stretches into and takes electrolytic cell to be used for drawing electrolyte；The outlet of water pump is connected to reverse osmosis membrane separation
Device fresh water mouth.
2. in Membrane seawater desalination according to claim 1 filter membrane purging system it is characterised in that also include evaporate
Device, described vaporizer is arranged between the concentrated seawater delivery outlet of energy recycle device and electrolytic cell, for concentrated seawater is further
Concentrate.
3. in Membrane seawater desalination according to claim 3 filter membrane purging system it is characterised in that also include condense
Device, the vapor that described condenser is used for vaporizer is discharged carries out being condensed into pure water.
4. in a kind of Membrane seawater desalination filter membrane cleaning method it is characterised in that using ionization device ionize from reverse osmosis membrane
The concentrated seawater that segregation apparatuss are discharged, the electrolyte using electrolysis carries out back washing to reverse osmosis membrane separation device.
5. in Membrane seawater desalination according to claim 4 filter membrane cleaning method it is characterised in that solar energy is changed
For electric energy to be supplied to ionization device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610721842.5A CN106422794A (en) | 2016-08-25 | 2016-08-25 | Cleaning system and method for filter membrane used in membrane-method sea water desalination |
Applications Claiming Priority (1)
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