CN202297261U - Sea water desalination device using low-pressure membrane method - Google Patents
Sea water desalination device using low-pressure membrane method Download PDFInfo
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- CN202297261U CN202297261U CN2011203351976U CN201120335197U CN202297261U CN 202297261 U CN202297261 U CN 202297261U CN 2011203351976 U CN2011203351976 U CN 2011203351976U CN 201120335197 U CN201120335197 U CN 201120335197U CN 202297261 U CN202297261 U CN 202297261U
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- membrane system
- reverse osmosis
- ultrafiltration
- nanofiltration
- sea water
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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
Abstract
The utility model discloses a sea water desalination device using a low-pressure membrane method. The device comprises a precise filter, an ultrafiltration membrane system, an ultrafiltration dialysis tank, a nanofiltration membrane system, a nanofiltration dialysis tank, a reverse osmosis membrane system, a pump and pipelines connecting the above parts. In the sea water desalination device, sea water enters into a simple prefiltration device by a delivery pump for filtration, then enters into an ultrafiltration membrane separation system, is buffered in the ultrafiltration dialysis tank and then enters into a nanofiltration (or low-retention reverse osmosis) membrane device; dialyzate is buffered in the nanofiltration (or low-retention reverse osmosis) dialyzate tank, and then enters into a reverse osmosis membrane device for treatment, and finally, desalinated sea water is obtained at the dialysis side. According to the utility model, a concentrated liquid of a nanofiltration (or low-retention reverse osmosis) membrane and a reverse osmosis concentrated liquid can be used for reversely washing the ultrafiltration system, and partial energy can be recycled by using an energy recycling device. The sea water desalination device can bear microorganism and organic pollutants in sea water and osmosis pressure step by step, so that the pressure-resisting requirement of sea water desalination equipment is reduced, and the safety and usability of the equipment are improved, thereby achieving desalination of sea water under the conditions of low pressure and low energy consumption.
Description
Technical field
The utility model discloses a kind of low pressure embrane method sea water distiling plant, relates to a kind of desalting plant, is meant that especially low-pressure membrane method separation seawater salinity obtains the device of fresh water.
Background technology
Existing sea water desaltination membrane separation unit and desalination method are that seawater is through certain pre-treatment; General use high-pressure process overcomes the high osmotic pressure of seawater salinity, desalting is produced and obtained fresh water; This process method is in order to guarantee once to remove the effect of salinity; And prevent to pollute, just have following defective part:
The liquid concentrator salinity that 1, must overcome under the seawater very high osmotic pressure, particularly high-recovery doubles, and osmotic pressure is higher, and working pressure is higher;
2, the film core of once holding back must have high rejection, and the separating layer of film is must more common reverse osmosis membrane thicker or more closely knit; Under high pressure operation, rete is densification more easily simultaneously, and these two aspects all can cause membrane resistance to increase severely;
3, in order to prevent that film from polluting, just must have very high flow velocity to prevent the deposition pollution, or other measure prevent to pollute.
Have above three point defects of film device now, will increase the device fabrication cost and the running cost of seawater desalination system greatly.
China document CN201485337U discloses a kind of low-pressure membrane partition method sea water distiling plant; Comprise accurate filter, nanofiltration membrane separation device, nanofiltration dialysate tank, one-level low pressure reverse osmosis film system, first-stage reverse osmosis dialysate tank, secondary low pressure reverse osmosis film system, pump and be connected each pipeline partly; This device has utilized the nanofiltration/reverse osmosis membrane of the high working pressures in three roads to desalinate; And do not have recovered energy, unit consumption of energy is too high.
The utility model content
To the deficiency of prior art, the utility model provide a kind of less energy-consumption, low pressure embrane method sea water distiling plant, utilize low-pressure membrane to separate to realize the purpose of sea water desaltination; Reduce system pressure; Reduce the device fabrication requirement, reduce film simultaneously and pollute and membrane resistance, reduce film running cost.
For reaching this purpose, the utility model is realized through following technical scheme:
A kind of low pressure embrane method sea water distiling plant; Comprise accurate filter, ultrafiltration membrane system, ultrafiltration dialysis jar, nanofiltration (or low rejection r-o-) film system, nanofiltration (or low rejection r-o-) dialysate tank, reverse osmosis membrane system, pump and be connected each pipeline partly; The opening for feed of described accurate filter links to each other with the seawater transferpump and removes the PM for particulate matter in the seawater; The discharge port of accurate filter be linked in sequence ultrafiltration membrane system, ultrafiltration dialysis jar, nf membrane system, nanofiltration dialysate tank, reverse osmosis membrane system: described ultrafiltration membrane system is removed can cause in the seawater that film pollutes that the overwhelming majority is inorganic, organic pollutant and the dialyzate that sees through only contains the seawater of soluble salt, deposits ultrafiltration dialysis jar buffering in; Dialyzate in the ultrafiltration dialysis jar passes through pipe connection in the nf membrane system, and removes the salinity of major part, gets into nanofiltration dialysate tank buffering then; The seawater that has removed most of salinity gets in the reverse osmosis system again, and desalination obtains meeting the fresh water of standard for drinking once more.
Further, on the pipeline between described ultrafiltration membrane system and the accurate filter recycle pump is installed, the ultrafiltration dialysis jar is connected with the nf membrane system through topping-up pump, and the nanofiltration dialysate tank links to each other with reverse osmosis membrane system through topping-up pump.
Further, the liquid concentrator of described nf membrane system directly the ultrafiltration membrane system that is used in discharging or gap carry out back flushing to keep the ultra-filtration membrane flux stabilized.
Further, described nf membrane system also connects an energy recycle device and is used to promote pressure and the flow velocity that dialyzate in the ultrafiltration dialysis jar gets into the nf membrane system with the high pressure potential energy that reclaims liquid concentrator, and this energy recycle device is connected with the ultrafiltration dialysis jar.
Further, the liquid concentrator of said reverse osmosis membrane system turns back to the ultrafiltration dialysis jar and carries out nanofiltration and r-o-the ultrafiltration system flux stabilized is kept in circulating filtration or the back flushing that is used for ultrafiltration system once more.
Further, described reverse osmosis membrane system also connects an energy recycle device and reclaims pressure and the flow velocity that reverse osmosis concentrated liquid high pressure potential energy is used to promote the nanofiltration dialyzate, and this energy recycle device is connected with the nanofiltration dialysate tank.
Further, described nf membrane system also can be substituted by low rejection reverse osmosis membrane system.
Further; It is 0.05-0.002um or molecular weight cut-off 2000D-500KD that the film of described ultrafiltration membrane system is held back the aperture; Between 40-95%, reverse osmosis membrane system is to the population mean rejection of salinity in the seawater to the population mean rejection of salinity in the seawater for nanofiltration or low rejection reverse osmosis membrane system>90%.
The utility model relates to a kind of low pressure embrane method seawater desalination system constructional device, and this constructional device has comprised the in-line pump valvegear of accurate pre-filtrating equipment, ultra-filtration membrane separation system or device, ultrafiltration dialysis flow container, nanofiltration (or low rejection r-o-) film device, nanofiltration (or low rejection r-o-) dialysis flow container, reverse osmosis membrane system or device and relevant connection.Seawater gets into the ultra-filtration membrane tripping device after getting into simple pre-filtrating equipment filtration through transferpump; Through the seawater after the ultrafiltration membrane system filtration, after ultrafiltration dialysis jar buffering, get into nanofiltration (or low rejection r-o-) film device; Nanofiltration or low rejection reverse osmosis membrane see through liquid after nanofiltration or nanofiltration or low rejection r-o-dialysis flow container buffering, get into reverse osmosis membrane apparatus and handle, finally obtain desalination water in the dialysis side.The liquid concentrator of nanofiltration or low rejection reverse osmosis membrane, the liquid concentrator of r-o-can be used for the back flushing ultrafiltration system, also can use energy recycle device to come the recovery part energy.This device can be born mikrobe and organic-inorganic pollutent, the osmotic pressure of seawater step by step, and the desalting plant requirement of withstand voltage is reduced, and has promoted the security and the ease for use of equipment, realizes the sea water desaltination under low pressure, the less energy-consumption.
The utlity model has following beneficial effect:
1. utilize ultra-filtration membrane to soluble salt do not hold back, to the characteristics that membrane contaminant is held back, can realize the utmost point less energy-consumption water purification of plunging into the commercial sea, for the continual and steady operation of the film system of back lays the foundation;
2. the seawater after purifying through ultrafiltration only contains soluble salt, under the prerequisite of the control recovery, makes the film surface circular flow in nanofiltration and the reverse osmosis membrane system can be very low, and relevant with the recovery, this just greatly reduces energy consumption;
3. the characteristics of utilizing nanofiltration (or low rejection r-o-) film that the salt portions is held back can be shared the osmotic pressure of part, reduce the burden of back reverse osmosis system, and simultaneity factor self-operating pressure also so significantly reduces.In the responsive occasion of energy consumption, the high pressure potential energy available energy retrieving arrangement of liquid concentrator reclaims, and is used to promote pressure and the flow velocity that ultrafiltration dialysis liquid gets into nanofiltration (or low rejection r-o-) film; Also can intermittently be used for the back flushing of ultrafiltration system, keep the ultrafiltration system flux stabilized;
4. through the seawater of nanofiltration (or low rejection r-o-) after film has been removed the major part salinity; Osmotic pressure significantly reduces; And saltiness reduces; Can use the r-o-of common specification to carry out desalination work, can under lower working pressure, just can realize the purpose of desalination desalination, product water qualified water.Can the incorporating nanofiltration (or low rejection r-o-) film system into through pipeline and be used of reverse osmosis concentrated liquid; Or utilize energy recycle device to reclaim; Be used to promote the pressure and the flow velocity of ultrafiltration dialysis liquid, or can be used for the back flushing of ultrafiltration system, keep the ultrafiltration system flux stabilized;
5. in the film system of low pressure, rete densification degree is not high, and the resistance that sees through film is low, and power loss is few;
6. utilize the two-stage film except sharing osmotic pressure; Reduce outside the system energy consumption; Can form the double shield that produces water water quality, the trickle fluctuation of the rejection of twin-stage film can be inresponsive as the single stage membrane system yet, and wherein the slight variations of the rejection of one film can not cause very big fluctuation to producing water water quality;
7. the requirement of film core is reduced, do not need the reverse osmosis membrane of 99.7% rejection, only need the film core of common rejection to arrange in pairs or groups and get final product;
8. system's operating pressure is low, and the device fabrication cost reduces.
Description of drawings
Fig. 1 is the synoptic diagram of the utility model.
Fig. 2 is the synoptic diagram of the utility model energy content retrieving arrangement.
Label declaration: 1, seawater front pump, 2, accurate filter, 3, recycle pump; 4, ultrafiltration membrane system, 5, the ultrafiltration dialysis jar, 6, topping-up pump; 7, nanofiltration (or low rejection r-o-) film system, 8, nanofiltration (or low rejection r-o-) dialysate tank, 9 topping-up pumps; 10, reverse osmosis membrane system
11,12, energy recycle device.
Embodiment
Combine accompanying drawing and embodiment that the utility model is explained further details at present:
As depicted in figs. 1 and 2; A kind of low pressure embrane method sea water distiling plant; Comprise accurate filter 2, ultrafiltration membrane system 4, ultrafiltration dialysis jar 5, nf membrane system 7, nanofiltration dialysate tank 8, reverse osmosis membrane system 10, pump and be connected each pipeline partly; The opening for feed of described accurate filter 2 links to each other with seawater transferpump 1 and removes the PM for particulate matter in the seawater; The discharge port of accurate filter 2 be linked in sequence ultrafiltration membrane system 4, ultrafiltration dialysis jar 5, nf membrane system 7, nanofiltration dialysate tank 8, reverse osmosis membrane system 10: described ultrafiltration membrane system 4 is removed can cause in the seawater that film pollutes that the overwhelming majority is inorganic, organic pollutant and the dialyzate that sees through only contains the seawater of soluble salt, deposits ultrafiltration dialysis jar 5 bufferings in; Dialyzate in the ultrafiltration dialysis jar 5 passes through pipe connection in nf membrane system 7, and removes the salinity of major part, gets into nanofiltration dialysate tank 8 bufferings then; The seawater that has removed most of salinity gets in the reverse osmosis system 10 again, gets into the fresh water that the reverse osmosis membrane system desalination obtains meeting standard for drinking once more.In the utility model; It is 0.05-0.002um or molecular weight cut-off 2000D-500KD that ultrafiltration membrane system is held back the aperture; Between 40-95%, second stage reverse osmosis membrane is to the population mean rejection of salinity in the seawater to the population mean rejection of salinity in the seawater for first step nanofiltration or low pressure (low rejection) reverse osmosis membrane>90%.
See also Fig. 1 or Fig. 2, recycle pump 3 is installed on the pipeline between described ultrafiltration membrane system 4 and the accurate filter 2, ultrafiltration dialysis jar 5 is connected with nf membrane system 7 through topping-up pump 6, and nanofiltration dialysate tank 8 links to each other with reverse osmosis membrane system 10 through topping-up pump 9.
See also Fig. 1 or Fig. 2, the liquid concentrator of nf membrane system 7 directly discharges or the ultrafiltration membrane system 4 that is used in gap is carried out back flushing to keep the ultra-filtration membrane flux stabilized; Nf membrane system 7 also connects an energy recycle device 12 and is used to promote pressure and the flow velocity that ultrafiltration dialysis jar 5 interior dialyzates get into the nf membrane system with the potential energy that reclaims liquid concentrator, and this energy recycle device 12 is connected with ultrafiltration dialysis jar 5.The liquid concentrator of said reverse osmosis membrane system 10 turns back to the ultrafiltration dialysis jar to carry out nanofiltration and r-o-the ultrafiltration system flux stabilized is kept in circulating filtration or the back flushing that is used for ultrafiltration system once more; Reverse osmosis membrane system 10 also connects an energy recycle device 11 and reclaims pressure and the flow velocity that reverse osmosis concentrated liquid is used to promote the nanofiltration dialyzate, and this energy recycle device 11 is connected with nanofiltration dialysate tank 8.
A kind of low pressure sea water distiling plant, it comprises accurate filter, ultra-filtration membrane tripping device, ultra-filtration membrane dialysate tank, nanofiltration (or low rejection r-o-) film system, nanofiltration (or low rejection r-o-) film dialysate tank, reverse osmosis membrane system, reverse osmosis membrane dialysate tank, pump, energy recycle device and the pipeline that is connected each several part.The seawater transferpump connects accurate filter; Accurate filter is connected with ultrafiltration membrane system through transferpump, and the ultrafiltration membrane system dialyzate is connected to the ultrafiltration dialysis jar; Ultrafiltration dialysis liquid is connected with nanofiltration (or low rejection r-o-) film system through transferpump (or and supercharging recycle pump), and the dialysis tubing of nanofiltration (or low rejection r-o-) film system is connected to nanofiltration (or low rejection r-o-) film dialysate tank; Nanofiltration (or low rejection r-o-) dialysate tank is connected with reverse osmosis system through transferpump (or and supercharging recycle pump) again.The liquid concentrator of nanofiltration (or low rejection r-o-) film system can connect energy recycle device according to the requirement of energy consumption; Be used to promote the pressure of a part of ultrafiltration dialysis liquid, the ultrafiltrated after the acquisition supercharging gets into nanofiltration (or low rejection r-o-) film system through pipeline.If liquid concentrator not recovered energy can be connected in ultra-filtration membrane dialysis side through pipeline and is used for recoil or discharging.The liquid concentrator of reverse osmosis membrane system can connect energy recycle device according to the requirement of energy consumption; Be used to promote the pressure of a part of nanofiltration (or low rejection r-o-) dialyzate, nanofiltration (or the low rejection r-o-) dialyzate after the acquisition supercharging gets into reverse osmosis membrane system through pipeline.If liquid concentrator not recovered energy can be connected in ultra-filtration membrane dialysis side through pipeline and is used for recoil or returns nanofiltration (or low rejection r-o-) film system reuse through pipeline.It is 0.05-0.002um or molecular weight cut-off 2000D-500KD that ultra-filtration membrane is held back the aperture, first step nanofiltration or low pressure reverse osmosis film to the population mean rejection of salinity in the seawater between 40-95%, the second stage>90%.
This patent adopts simple accurate filter to remove the PM for particulate matter that stops up ultrafiltration membrane system in the seawater; Connect ultra-filtration membrane again; Utilize ultra-filtration membrane to remove and to cause film to pollute inorganic, the organic pollutant of the overwhelming majority in the seawater, see through the seawater that only contains soluble salt, deposit ultrafiltration dialysis surge tank buffering in; Ultrafiltration dialysis liquid is connected in nanofiltration (or low rejection r-o-) the film system through pipeline, in nanofiltration (or low rejection r-o-) film system, removes the salinity of major part, gets into nanofiltration (or low rejection r-o-) film surge tank then; The seawater that has removed most of salinity gets in the reverse osmosis system again, advances the fresh water that the reverse osmosis membrane desalination obtains meeting standard for drinking once more, and reverse osmosis concentrated liquid returns to incorporate in nanofiltration (or low pressure reverse osmosis) the film system through pipeline and goes to utilize again.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; But the those skilled in the art should be understood that; In the spirit and scope of the utility model that does not break away from appended claims and limited; Can make various variations to the utility model in form with on the details, be the protection domain of the utility model.
Claims (9)
1. low pressure embrane method sea water distiling plant; It is characterized in that: this device comprises accurate filter, ultrafiltration membrane system, ultrafiltration dialysis jar, nf membrane system, nanofiltration dialysate tank, reverse osmosis membrane system, pump and is connected each pipeline partly; Accurate filter wherein; Its opening for feed links to each other with the seawater transferpump, the discharge port of accurate filter be linked in sequence ultrafiltration membrane system, ultrafiltration dialysis jar, nf membrane system, nanofiltration dialysate tank, reverse osmosis membrane system;
The dialyzate of described ultrafiltration membrane system deposits ultrafiltration dialysis jar buffering in;
Dialyzate in the ultrafiltration dialysis jar in the nf membrane system, gets into nanofiltration dialysate tank buffering through pipe connection then;
Removed the fresh water that seawater gets in the reverse osmosis system and desalination obtains meeting standard for drinking once more of most of salinity in the nanofiltration dialysate tank.
2. low pressure embrane method sea water distiling plant according to claim 1; It is characterized in that: on the pipeline between described ultrafiltration membrane system and the accurate filter recycle pump is installed; The ultrafiltration dialysis jar is connected with the nf membrane system through topping-up pump, and the nanofiltration dialysate tank links to each other with reverse osmosis membrane system through topping-up pump.
3. low pressure embrane method sea water distiling plant according to claim 1 is characterized in that: the liquid concentrator of the described nf membrane system directly ultrafiltration membrane system that is used in discharging or gap carries out back flushing to keep the ultra-filtration membrane flux stabilized.
4. according to claim 1 or 3 described low pressure embrane method sea water distiling plants; It is characterized in that: described nf membrane system also connects an energy recycle device and is used to promote pressure and the flow velocity that dialyzate in the ultrafiltration dialysis jar gets into the nf membrane system with the potential energy that reclaims liquid concentrator, and this energy recycle device is connected with the ultrafiltration dialysis jar.
5. low pressure embrane method sea water distiling plant according to claim 1 is characterized in that: the liquid concentrator of said reverse osmosis membrane system turns back to the ultrafiltration dialysis jar to carry out nanofiltration and r-o-the ultrafiltration system flux stabilized is kept in circulating filtration or the back flushing that is used for ultrafiltration system once more.
6. according to claim 1 or 5 described low pressure embrane method sea water distiling plants; It is characterized in that: described reverse osmosis membrane system also connects an energy recycle device and reclaims pressure and the flow velocity that reverse osmosis concentrated liquid is used to promote the nanofiltration dialyzate, and this energy recycle device is connected with the nanofiltration dialysate tank.
7. according to claim 1 or 2 or 3 or 5 described low pressure embrane method sea water distiling plants, it is characterized in that: described nf membrane system can be substituted by low rejection reverse osmosis membrane system.
8. according to claim 1 or 2 or 3 or 5 described low pressure embrane method sea water distiling plants; It is characterized in that: it is 0.05-0.002um or molecular weight cut-off 2000D-500KD that the film of described ultrafiltration membrane system is held back the aperture; Between 40-95%, reverse osmosis membrane system is to the population mean rejection of salinity in the seawater to the population mean rejection of salinity in the seawater for nanofiltration or low rejection reverse osmosis membrane system>90%.
9. low pressure embrane method sea water distiling plant according to claim 4; It is characterized in that: it is 0.05-0.002um or molecular weight cut-off 2000D-500KD that the film of described ultrafiltration membrane system is held back the aperture; Between 40-95%, reverse osmosis membrane system is to the population mean rejection of salinity in the seawater to the population mean rejection of salinity in the seawater for nanofiltration or low rejection reverse osmosis membrane system>90%.
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| CN2011203351976U CN202297261U (en) | 2011-09-08 | 2011-09-08 | Sea water desalination device using low-pressure membrane method |
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| CN2011203351976U CN202297261U (en) | 2011-09-08 | 2011-09-08 | Sea water desalination device using low-pressure membrane method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047725A (en) * | 2013-01-14 | 2013-04-17 | 浙江理工大学 | Two-stage reverse osmosis regenerative heat source tower heat pump system |
| CN105214501A (en) * | 2014-05-29 | 2016-01-06 | 北京朗新明环保科技有限公司 | Turbine Inner eycle surpasses/microfiltration systems |
-
2011
- 2011-09-08 CN CN2011203351976U patent/CN202297261U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047725A (en) * | 2013-01-14 | 2013-04-17 | 浙江理工大学 | Two-stage reverse osmosis regenerative heat source tower heat pump system |
| CN103047725B (en) * | 2013-01-14 | 2015-09-09 | 浙江理工大学 | The heat source tower heat pump system of double-stage reverse osmosis regeneration |
| CN105214501A (en) * | 2014-05-29 | 2016-01-06 | 北京朗新明环保科技有限公司 | Turbine Inner eycle surpasses/microfiltration systems |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Xiamen Zhengcheng Membrane Cleaning Technology Co.,Ltd. Assignor: Wu Zhangfeng Contract record no.: 2012350000082 Denomination of utility model: Device for desalting sea water by low-pressure membrane method Granted publication date: 20120704 License type: Exclusive License Record date: 20120817 |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120704 Termination date: 20170908 |