CN101205086B - Strong brine vacuum membrane distillation technique for sea water desalination - Google Patents
Strong brine vacuum membrane distillation technique for sea water desalination Download PDFInfo
- Publication number
- CN101205086B CN101205086B CN2006101304809A CN200610130480A CN101205086B CN 101205086 B CN101205086 B CN 101205086B CN 2006101304809 A CN2006101304809 A CN 2006101304809A CN 200610130480 A CN200610130480 A CN 200610130480A CN 101205086 B CN101205086 B CN 101205086B
- Authority
- CN
- China
- Prior art keywords
- strong brine
- vacuum
- membrane
- membrane distillation
- sea water
- 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.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
Landscapes
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention relates to a process for distilling sea water desalination concentrated saltwater by using a vacuum membrane, which belongs to the technological fields of sea water desalination and salt making. In the process, hot solution of the sea water desalination concentrated saltwater passes through one side of membrane components and the other side of the membrane components is vacuumized so that a transmission vapor pressure gradient is formed between the two sides of the membrane; steam is generated on a vacuum side and is condensed into liquid water so as to realize the concentration and separation of the concentrated saltwater as well as determine process parameter in the reaction process.The distilling method by using the vacuum membrane combines the sea water desalination with the salt making and uses the pressure gradient between the two sides of the membrane as driving force with high separation efficiency and large membrane flux. Besides, the invention has the advantages of convenient operation, energy economization, small occupied area, low environmental pollution, etc., and has wide application prospect.
Description
Technical field
The invention belongs to sea water desaltination and salt making technology field, relate to a kind of strong brine vacuum membrane distillation technique for sea water desalination.
Background technology
Present industrialized method for desalting seawater mainly contains: methods such as multistage flash evaporation, reverse osmosis, multi-effect distilling and pressure steam distillation.Cost of seawater desalination is generally higher, and this has restricted the popularization of sea water desaltination industry undoubtedly, and therefore how reducing the sea water desaltination cost is that sea water desaltination realizes the subject matter that industrialization faces.In addition, the processing emission problem of a large amount of strong brines of big industrial scale sea water desaltination generation also can not be ignored; If have the long-term row of the strong brine of number of chemical additive certainly will cause pollution from the marine eco-environment to the ocean.The directly method in row sea is adopted towards rare back in the processing of external at present open marine site strong brine that sea water desaltination produces, but considers that from the recycling economy angle a large amount of dischargings of strong brine are the serious waste of resource.
Membrane distillation (MD) is to improve a kind of cheapness of sea water desalinization strong brine concentration, new membrane isolation technique efficiently, have and can under normal pressure or negative pressure, operate, can utilize low-grade heat sources such as sun power, underground heat, factory's used heat, waste heat, and equipment is simple, to advantages such as the requirement of mechanical strength of film are low.Membrane distillation is the membrane sepn process that membrane technique combines with evaporative process, and its used film is not by the dewatering microporous film of pending solution-wet.One side of film directly contacts (being called hot side) with pending hot solution, and opposite side contacts (being called cold side) with cold water solution directly or indirectly.Volatile component enters cold side and is condensed into liquid phase by film in the vaporization of face place in the hot side solution, and other components then are blocked in hot side by hydrophobic membrane, thereby realizes the purpose of mixture separation or purification.According to the difference of film cold side condensing mode, membrane distillation can be divided into four kinds of forms: directly contact membranes distills (DCMD), GAP TYPE membrane distillation (AGMD), sweep gas membrane distillation (SGMD) and vacuum membrane distillation (VMD).Adopt film distillation technology to handle the desalination strong brine, the ratio of desalinization that can make product fresh water is near 100%, and can realize membrane crystallization, therefore adopt this technology make the strong brine circulation and to greatest extent enrichment be fully feasible.
Over nearly 20 years, it is more that film distillation technology is used in the sea water desaltination area research, but have not yet to see the relevant report of sea water desaltination and salt industry being handled strong brine in conjunction with employing membrane distillation method.The present invention is the sea water desalinization strong brine film distillation technology, makes dense water cycle, when producing fresh water dense water is used for salt manufacturing.
Summary of the invention
The object of the present invention is to provide a kind of strong brine vacuum membrane distillation technique for sea water desalination.This technological operation is convenient, energy-conservation, floor space is little, environmental pollution is little, is with a wide range of applications.
The present invention is achieved through the following technical solutions:
A kind of strong brine vacuum membrane distillation technique for sea water desalination, this technology may further comprise the steps:
(1) connects the membrane distillation system;
(2) in the storage tank of membrane distillation system, add strong brine;
(3) open brinepump, the still-process feeding temperature set(ting)value of setting the vacuum diaphragm membrane module is 40～90 ℃, and strong brine employing brinepump is transported in the coil heat exchanger and heats;
(4) open the water bath with thermostatic control temperature control of this coil heat exchanger, circulation heating strong brine; Adjust the flow of strong brine by under meter, after the feeding temperature for the treatment of this membrane module reaches set(ting)value and constant 8～12min, open cryogenic liquid recycle pump and cooling water system;
(5) open vacuum pump, read vacuum tightness, the membrane module still-process of membrane distillation system begins, and produces strong brine and fresh water, and this strong brine returns storage tank, and fresh water divides two-way to enter mixing condenser and coil condenser; Write down temperature, flow and pressure before current strong brine enters membrane module; Required time when measuring vacuum membrane distillation process permeate water steam, calculate the flux of this feed liquid vacuum membrane distillation under the predetermined operation condition;
(6) fresh water through low temperature thermostat bath enters the fresh water sampling bottle; The fresh water that enters mixing condenser enters the fresh water receiving flask; Measure the chlorine ion concentration of the strong brine and the fresh water that produces, and calculate the ratio of desalinization of feed liquid vacuum membrane distillation process;
(7) change stock liquid flow and membrane module inlet temperature, repeat above step.
And the predetermined operation condition of described strong brine vacuum membrane distillation technique for sea water desalination is: vacuum tightness is 0.05～0.2Mpa, and feeding temperature is 40～90 ℃, and the strong brine flow is 0.01～0.2m
3/ h; Wherein optimum process condition is: vacuum tightness is 0.1Mpa, and feeding temperature is 68 ℃, and the strong brine flow is 0.09m
3/ h.
And the concentration of described strong brine is 6～15 degree Beaume.
And the mould material that described membrane module adopted is the multiple film (PTFE) of polypropylene (PP) grid tetrafluoroethylene or multiple film (PTFE) film of polypropylene (PP) continuous yarn non-woven fabrics tetrafluoroethylene or poly-inclined to one side tetrafluoroethylene (PVDF) film.
Beneficial effect of the present invention and advantage are:
1. the present invention uses the vacuum membrane distillation method to desalinate strong brine, with strong brine circulation, produces fresh water and strong brine is carried to greatest extent dense, and its fresh water ratio of desalinization is more than 99.8%.
2. the present invention carries out strong brine vacuum membrane distillation mode and Study of optimization in conjunction with the low-grade heat source (waste water, low-pressure steam) of factory, determines optimum operation condition, reduces the cost of sea water desalinization strong brine greatly.
3. the present invention adopts vacuum membrane distillation discharging strong brine to be used for salt manufacturing in conjunction with salt industry, saves salt pan system halogen district area, increases substantially per unit area yield, and realizes the zero release of a whole set of technology.
4. vacuum membrane distillation method of the present invention combines sea water desaltination and salt industry, pressure difference with the film both sides is a motivating force, the separation efficiency height, and membrane flux is big, have advantages such as easy to operate, energy-conservation, that floor space is little, environmental pollution is little, be with a wide range of applications.
Description of drawings
Fig. 1 is system and device figure of the present invention.
Embodiment
The present invention is described in further detail by following examples, and following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.
The structure of this membrane distillation system is as shown in Figure 1:
Desalination strong brine in the storage tank 11 of left side is conveyed into coil heat exchanger 9 by brinepump 12, through water bath with thermostatic control 10 temperature controls, strong brine temperature in the membrane distillation process is consistent in this interchanger.Be separately installed with flow, pressure and temperature before under meter 1, tensimeter and thermometer (the two is label not) are used to measure strong brine and enter membrane module on the pipeline between interchanger and membrane module 8.Vacuum pump 2 is opened, and strong brine enters behind the membrane module and after distillment, the strong brine that the distillation back is produced flows out the back by membrane module and returns storage tank by pipeline, makes the strong brine enrichment in the storage tank.The right side of membrane module connects vacuum system, water molecules in the strong brine gasifies under the effect of membrane module pressure at both sides difference and sees through fenestra, after cooling, become fresh water, this fresh water one tunnel enters fresh water collecting bottle 3 as detecting after low temperature thermostat bath 5 coolings of coil condenser 6, another road enters fresh water receiving flask 4 after mixing condenser 7 coolings.
This vacuum membrane distillation desalination process may further comprise the steps:
(1) connects the membrane distillation system;
(2) add strong brine in the storage tank of membrane distillation system, the concentration of this strong brine is 6～15 degree Beaume;
(3) open brinepump, the still-process feeding temperature set(ting)value of setting the vacuum diaphragm membrane module is 40～90 ℃, and strong brine employing brinepump is transported in the coil heat exchanger and heats;
(4) open the water bath with thermostatic control temperature control of this coil heat exchanger, circulation heating strong brine; By under meter strong brine flow is 0.09m
3/ h, the feeding temperature for the treatment of this membrane module open cryogenic liquid recycle pump and cooling water system after reaching 68 ℃ and constant 10min;
(5) open vacuum pump, reading vacuum tightness is 0.1Mpa, and the membrane module still-process of membrane distillation system begins, and produces strong brine and fresh water, and this strong brine returns storage tank, and fresh water divides two-way to enter mixing condenser and coil condenser; Write down temperature, flow and pressure before current strong brine enters membrane module; Required time when measuring vacuum membrane distillation process permeate water steam, calculate the flux of this feed liquid vacuum membrane distillation under the predetermined operation condition;
(6) fresh water through low temperature thermostat bath enters the fresh water sampling bottle; The fresh water that enters mixing condenser enters the fresh water receiving flask; Measure the chlorine ion concentration of the strong brine and the fresh water that produces, and calculate the ratio of desalinization of feed liquid vacuum membrane distillation process;
(7) change stock liquid flow and membrane module inlet temperature, repeat above step.
The mould material that this membrane module adopted is the multiple film (PTFE) of polypropylene (PP) grid tetrafluoroethylene or multiple film (PTFE) film of polypropylene (PP) continuous yarn non-woven fabrics tetrafluoroethylene or poly-inclined to one side tetrafluoroethylene (PVDF) film.
Further set forth substantive distinguishing features of the present invention below by application example.
Application example 1:
Adopt the multiple film (PTFE) of polypropylene (PP) grid tetrafluoroethylene to carry out the VMD experiment, when strong brine concentration is that 7 degree Beaume, feeding temperature are that 68 ℃, flow are 0.09m
3/ h, when vacuum tightness is 0.1Mpa, membrane flux is 32kgm
-2H
-1, the ratio of desalinization of this moment is more than 99.8%.
Application example 2:
Adopt multiple film (PTFE) film of polypropylene (PP) continuous yarn non-woven fabrics tetrafluoroethylene to carry out the VMD experiment, internal aperture is 0.2 μ m, and porosity is 20%, and useful area is 3.848 * 10
-3m
3, when strong brine concentration is that 10 degree Beaume, feeding temperature are 53 ℃, flow is 0.03m
3/ h, when vacuum tightness is 0.05Mpa, membrane flux is 20kgm
-2H
-1, the ratio of desalinization of this moment is more than 99%.
Application example 3:
Adopt poly-inclined to one side tetrafluoroethylene (PVDF) film to carry out the VMD experiment, internal aperture is 0.6mm, and length is 240mm, and porosity is 80%, and useful area is 0.2713m
3, film silk quantity is 600, when strong brine concentration is that 15 degree Beaume, feeding liquid temperature are that 80 ℃, feeding liquid flow are 0.2m
3/ h, when vacuum tightness is 0.2Mpa, membrane flux is 25kgm
-2H
-1, the ratio of desalinization of this moment is more than 99%.
Claims (2)
1. strong brine vacuum membrane distillation technique for sea water desalination is characterized in that:
This technology may further comprise the steps:
(1) connects the membrane distillation system;
(2) in the storage tank of membrane distillation system, add strong brine;
(3) open brinepump, the still-process feeding temperature set(ting)value of setting the vacuum diaphragm membrane module is 40～90 ℃, and strong brine employing brinepump is transported in the coil heat exchanger and heats;
(4) open the water bath with thermostatic control temperature control of this coil heat exchanger, circulation heating strong brine; Adjust the flow of strong brine by under meter, after the feeding temperature for the treatment of this membrane module reaches set(ting)value and constant 8～12min, open cryogenic liquid recycle pump and cooling water system;
(5) open vacuum pump, read vacuum tightness, the membrane module still-process of membrane distillation system begins, and produces strong brine and fresh water, and this strong brine returns storage tank, and fresh water divides two-way to enter mixing condenser and coil condenser; Write down temperature, flow and pressure before current strong brine enters membrane module; Required time when measuring vacuum membrane distillation process permeate water steam, calculate the flux of this feed liquid vacuum membrane distillation under the predetermined operation condition;
(6) fresh water through low temperature thermostat bath enters the fresh water sampling bottle; The fresh water that enters mixing condenser enters the fresh water receiving flask; Measure the chlorine ion concentration of the strong brine and the fresh water that produces, and calculate the ratio of desalinization of feed liquid vacuum membrane distillation process;
(7) change stock liquid flow and membrane module inlet temperature, repeat above step;
The predetermined operation condition of described strong brine vacuum membrane distillation technique for sea water desalination is: vacuum tightness is 0.05～0.2Mpa, and feeding temperature is 40～90 ℃, and the strong brine flow is 0.01～0.2m
3/ h;
The concentration of described strong brine is 6～15 degree Beaume.
2. strong brine vacuum membrane distillation technique for sea water desalination according to claim 1 is characterized in that: the mould material that described membrane module adopted is the multiple film of polypropylene lattice tetrafluoroethylene or multiple film of polypropylene filament non-woven fabrics tetrafluoroethylene or poly-inclined to one side tetrafluoroethylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101304809A CN101205086B (en) | 2006-12-21 | 2006-12-21 | Strong brine vacuum membrane distillation technique for sea water desalination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101304809A CN101205086B (en) | 2006-12-21 | 2006-12-21 | Strong brine vacuum membrane distillation technique for sea water desalination |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101205086A CN101205086A (en) | 2008-06-25 |
| CN101205086B true CN101205086B (en) | 2010-09-01 |
Family
ID=39565597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101304809A Expired - Fee Related CN101205086B (en) | 2006-12-21 | 2006-12-21 | Strong brine vacuum membrane distillation technique for sea water desalination |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101205086B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101891279B (en) * | 2009-05-19 | 2012-05-23 | 江苏卡特新能源有限公司 | Epoxy plasticizer production wastewater processing system and method thereof |
| CN102433434A (en) * | 2010-09-29 | 2012-05-02 | 王辉 | Method for increasing recovery rate of lithium separated with lithium-containing brine membrane method by using water as circulating working substance (water washing circulation method) |
| CN102491374A (en) * | 2011-11-23 | 2012-06-13 | 华东理工大学 | Method for alkali making by membrane crystallization |
| CN102600626B (en) * | 2012-03-23 | 2014-04-02 | 胡治邠 | Cascade highly-dispersed dehydration equipment for strong brine |
| CN103663627B (en) * | 2013-12-13 | 2015-11-11 | 哈尔滨锅炉厂有限责任公司 | Membrane distillation concentration and utilize concentrated seawater system and concentration method |
| KR101695779B1 (en) * | 2015-05-13 | 2017-01-12 | 한국에너지기술연구원 | Intelligent vacuum membrane distillation module and freshwater apparatus of seawater comprising the same |
| CN106237649B (en) * | 2016-07-27 | 2019-03-26 | 大唐环境产业集团股份有限公司 | A kind of membrane distillation crystallization treatment device and method |
| CN106946320A (en) * | 2017-04-14 | 2017-07-14 | 东华大学 | One kind processing high salt dangerous waste percolate system and its application method |
| CN114873672B (en) * | 2022-04-24 | 2024-02-27 | 扬州大学 | Membrane distillation assembly for synchronously strengthening membrane pollution control and water production |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3964985A (en) * | 1974-10-29 | 1976-06-22 | Ionics, Incorporated | Electrodialysis apparatus and process for ion modification |
| CN85109400A (en) * | 1984-11-21 | 1987-07-01 | 赛林斯研究有限公司 | About utilizing permeable pressure head concentrated liquid and the corresponding apparatus thereof that exists between two kinds of liquid |
| CN1352573A (en) * | 1999-05-27 | 2002-06-05 | 荷兰应用科学研究会(Nto) | Method for the purification of a liquid by membrane distillation, in particular for the production of desalinated water from seawater or brackish water or process water |
| CN1787970A (en) * | 2003-05-12 | 2006-06-14 | 清洁水净化技术有限责任公司 | Method and device for the purification, especially desalination, of water |
-
2006
- 2006-12-21 CN CN2006101304809A patent/CN101205086B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3964985A (en) * | 1974-10-29 | 1976-06-22 | Ionics, Incorporated | Electrodialysis apparatus and process for ion modification |
| CN85109400A (en) * | 1984-11-21 | 1987-07-01 | 赛林斯研究有限公司 | About utilizing permeable pressure head concentrated liquid and the corresponding apparatus thereof that exists between two kinds of liquid |
| CN1352573A (en) * | 1999-05-27 | 2002-06-05 | 荷兰应用科学研究会(Nto) | Method for the purification of a liquid by membrane distillation, in particular for the production of desalinated water from seawater or brackish water or process water |
| CN1787970A (en) * | 2003-05-12 | 2006-06-14 | 清洁水净化技术有限责任公司 | Method and device for the purification, especially desalination, of water |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101205086A (en) | 2008-06-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101205086B (en) | Strong brine vacuum membrane distillation technique for sea water desalination | |
| Ghalavand et al. | A review on energy consumption of desalination processes | |
| Meindersma et al. | Desalination and water recycling by air gap membrane distillation | |
| CN101417209B (en) | Energy-saving pressure-reduction distillation device and method | |
| CN104190258B (en) | Liquid gap multiple-effect membrane distillation technique and device thereof | |
| CN102060344B (en) | Multiple-effect membrane distillation method with high-efficiency inner heat recovering function | |
| CN102491577A (en) | Multi-stage series membrane distillation strong brine desalting method and device | |
| CN101204641A (en) | Treating system for film evaporating concentrated liquid and method therefor | |
| CN211595081U (en) | Sea water desalting device by liquid gravity distillation method | |
| CN104190260A (en) | Decompression combination airgap membrane distillation method and device thereof | |
| CN105709601A (en) | Heat pump-double-effect membrane distillation apparatus and distillation method | |
| CN102107120A (en) | Sweeping gas membrane distillation method | |
| Bahar et al. | Desalination: conversion of seawater to freshwater | |
| Chang et al. | Numerical study on performance and efficiency of batch submerged vacuum membrane distillation for desalination | |
| Cipollina et al. | Coupling sustainable energy with membrane distillation processes for seawater desalination | |
| CN101767841A (en) | Vacuum membrane distillation water-treatment plant utilizing solar energy | |
| CN201834781U (en) | Single-stage vacuum distillation seawater desalination device | |
| CN202193691U (en) | Equipment for triple-effect waste water desalination process | |
| CN104190259A (en) | Multi-effect decompression membrane distillation method and device thereof | |
| CN103626249A (en) | Sea water desalting device and method for solar photovoltaic semiconductor refrigeration | |
| CN102872721B (en) | Marine sea water desalinization device and desalinization method | |
| CN106995228B (en) | Membrane distillation method and distillation device for high-concentration brine | |
| CN103316588A (en) | Multiple-effect membrane distillation device and method | |
| CN207632539U (en) | A kind of groove type solar desalination plant based on film distillation | |
| KR101675639B1 (en) | Efficient open cycle ocean thermal energy conversion (OTEC) using vacuum membrane distillation (VMD) for selective power generation and seawater desalination |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Tianjin Haide Runzi Food Co., Ltd. Assignor: Tianjin University of Science & Technology Contract record no.: 2012120000045 Denomination of invention: Strong brine vacuum membrane distillation technique for sea water desalination Granted publication date: 20100901 License type: Exclusive License Open date: 20080625 Record date: 20120711 |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100901 Termination date: 20111221 |