CN101664642A - Device and method for air-blowing vacuum membrane distillation - Google Patents
Device and method for air-blowing vacuum membrane distillation Download PDFInfo
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- CN101664642A CN101664642A CN200810146565A CN200810146565A CN101664642A CN 101664642 A CN101664642 A CN 101664642A CN 200810146565 A CN200810146565 A CN 200810146565A CN 200810146565 A CN200810146565 A CN 200810146565A CN 101664642 A CN101664642 A CN 101664642A
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Abstract
本发明提供一种鼓气减压膜蒸馏装置及方法。鼓气减压膜蒸馏装置包括依次连接的下述部件：在原水侧设置的水槽；连接于水槽上的水泵，抽吸水槽中的原水；设置于水泵下游的压缩空气进口，用于向原水鼓入低压压缩空气；气液混合器，用于混合压缩空气和液体，形成气液混合流体；疏水膜组件，处理气液混合流体；在疏水膜组件出水侧设置负压产生装置。本发明在膜的原水侧鼓入压缩空气的同时，在膜的出水侧施加负压。在负压的抽吸作用下，水蒸汽与部分压缩空气一起透过疏水膜。不仅利用压缩空气的夹带吹扫作用将水蒸汽输送至膜的另一侧，提高传质效率，同时，还降低了对出水侧的真空度要求，降低设备造价。同时，可以有效减缓膜污染。
The invention provides an air-blown vacuum membrane distillation device and method. The air blowing vacuum membrane distillation device includes the following components connected in sequence: a water tank set on the raw water side; a water pump connected to the water tank to suck the raw water in the water tank; a compressed air inlet set downstream of the water pump for blowing the raw water Inject low-pressure compressed air; gas-liquid mixer, used to mix compressed air and liquid to form gas-liquid mixed fluid; hydrophobic membrane module, process gas-liquid mixed fluid; set negative pressure generating device on the water outlet side of the hydrophobic membrane module. In the present invention, while blowing compressed air into the raw water side of the membrane, negative pressure is applied to the water outlet side of the membrane. Under the suction effect of negative pressure, water vapor and part of compressed air pass through the hydrophobic membrane. It not only uses the entrained purge effect of compressed air to transport water vapor to the other side of the membrane, which improves the mass transfer efficiency, but also reduces the vacuum requirement on the water outlet side and reduces the equipment cost. At the same time, membrane fouling can be effectively slowed down.
Description
Technical field
The present invention relates to a kind of distillation device and method, relate in particular to the film method for separating and processing of water purified treatment and chemical separating.
Background technology
The film distillation has attracted worldwide concern and research in recent years.With common evaporimeter relatively, the disengagement area that one of the film distillation notable attribute is a unit volume is big, thereby can make device operation efficiently in the evaporation process of normal pressure, lower temperature, and the required vapor phase space of distillation procedure is very little.Compare with counter-infiltration, film distillation is hot driving process, and operating pressure is low, therefore to the film mechanical performance require lowly, cost of equipment is also low, the process security is improved, and the operating pressure of film distillation is low, the salt rejection rate height, film pollutes few.The film distillation is a kind of employing dewatering microporous film, is the film separation process of mass transfer driving force with film both sides steam pressure difference.Under the driving of the steam pressure difference of microporous hydrophobic membrane both sides, water vapour is condensed into liquid separation process again after heated former water one side is passed hydrophobic membrane.Because the hydrophobicity of film, have only water vapour can see through fenestra, former water and the non-volatile solute that is dissolved in wherein can't pass fenestra, so the film still-process in theory can removing ion, big molecule, colloid, cell and other non-volatile matter realization 100%.Microporous hydrophobic membrane plays the support shielding action between the two-phase in the film still-process.In the process of film distillation, two kinds of processes of heat and mass transfer take place simultaneously, temperature difference polarization also can produce simultaneously with temperature difference polarization phenomena, thereby the process of film distillation is produced adverse influence.
The operating temperature of film still-process is lower than traditional still-process, and operating pressure is lower than traditional film separation process; Mechanical performance to film requires lower; Compare with traditional still-process, the vapor space significantly reduces.The assembly of film distillation can be designed to latent heat and reclaim form, and has with the flexibility of small-sized membrane module formation large-scale production system efficiently.This process can the high aqueous solution of concentration of treatment, if solute is the material of easy crystallization, can realize film distillation crystallization to solution concentration to hypersaturated state, it is the present unique membrane process that can from solution, directly isolate crystallized product, and as long as the suitable temperature difference is kept in the film both sides, this process just can be carried out, and can utilize solar energy, underground heat, hot spring, waste heat of plant and the warm cheap energy such as industrial wastewater.
It is low that film distillation technology has an operating pressure, can obtain 99.99% salt rejection rate and under the excellent operation condition, be higher than the water flux of counter-infiltration, shown its application potential that substitutes (extensive pure water preparation) or additional technology (as being used for boats and ships drinking water etc.) as reverse osmosis technology, reducing investment and operating cost, improve the utilization rate of water, reduce the concentrated water discharge aspect, be expected to obtain remarkable economic efficiency and social benefit.
On a large amount of theoretical and experimental study bases, present the development four kinds of different film distillation procedure modes, comprises the distillation of direct contact type film, the distillation of GAP TYPE film, the distillation of gas flow purging formula film and the distillation of vacuum type film.Wherein contact method is that the steam that will see through perforated membrane directly enter pure water at cold side and carry out condensation, so condensation process is integrated in the membrane module, operate simply relatively, therefore is to be studied maximum a kind of films to distill mode.Yet compare with other mode of operation, directly the contact membranes distillation can cause more heat loss and comparatively serious temperature difference polarization, is the influence factor that this method can not be ignored.Vacuum type film distillation rule is to apply a negative pressure through side, will be retracted to through the water vapour of perforated membrane in the membrane module condenser in addition and carry out condensation liquefaction.The advantage of this process is that thermal loss is all littler than other three kinds of film distillation procedure methods, and distillating ventilating amount is higher, simultaneously, guarantees that the negative pressure that applies is lower than liquid and enters the pressure of fenestra to prevent that the fenestra humidifying from being that the vacuum type film distills a crucial link in service.So far, the vacuum type membrane distillation method is applied to remove volatile solutes from water body, prepares ultra-pure water, and concentrated etc. the research work of solution worldwide launches from the brackish water desalination.In these researchs, the influence that various operating conditions and technological parameter such as inflow temperature and concentration, hot side water body rate of circulating flow and steam pressure difference etc. distill the steam flux to the vacuum type film is by to a certain degree discussion.In addition, the heat and mass transfer mechanism of vacuum type film still-process is also further inquired into.
Because the film still-process is to be driving force with steam pressure difference or temperature difference, with present technical merit, compare with reverse osmosis technology in the pure water preparation field and there is no clear superiority, still, the high concentration solution concentrate aspect the development potentiality of film still-process be that reverse osmosis process is incomparable.The high osmotic pressure of fortified aqueous can't move reverse osmosis process, and the film distillation can be concentrated into hypersaturated state to the aqueous solution.
But, up to now, more than four kinds of films distillation modes all have some problems such as energy consumption height, efficient is low, reliability is low.Though simple as direct contact type film distillation process equipment, because Cooling and Heat Source directly contacts, make the equipment operation energy consumption higher, and be easy to generate hydrophobic membrane hydrophiling leakage problems; Though vacuum type film distillation membrane flux is bigger, and is higher to system requirements.GAP TYPE film distillation and air-flow sweeping type film distill that then flux is lower.Therefore, study new film distillation technology, reduce investment and operating cost, can obtain remarkable economic efficiency and social benefit.
Summary of the invention
The objective of the invention is to overcome defective of the prior art, a kind of novel air-blowing vacuum distillation device and method are provided.
The invention provides a kind of air-blowing vacuum distillation device, it is characterized in that, comprise the following parts that connect successively: at the tank of former water side setting; Be connected in the water pump on the tank, the former water in the suction tank; Be arranged at the compressed air inlet in water pump downstream, be used for going into low-pressure compressed air to former drum; Air and liquid mixer is used to mix compressed air and liquid, forms gas-liquid mixture fluid; The hydrophobic membrane assembly is handled gas-liquid mixture fluid; At hydrophobic membrane assembly water outlet side the negative pressure generation device is set.
In addition, the outlet at water pump is provided with heater.
In addition, the negative pressure generation device in the water outlet side setting of hydrophobic membrane assembly comprises: be connected in the condenser of hydrophobic membrane assembly delivery port, make steam and part compressed air by behind the membrane module, carry out condensation; The gas-liquid separator that is connected with condensator outlet carries out separating of gas and liquid; Water collect tank is arranged on the liquid flowing outlet of gas-liquid separator, is used to collect water; Vavuum pump is arranged on the gas discharge outlet of gas-liquid separator, is used to produce the negative pressure suction.
In addition, the negative pressure generation device in the water outlet side setting of hydrophobic membrane assembly comprises: be connected in the ejector of hydrophobic membrane assembly delivery port, produce the negative pressure suction; Water pump is arranged on the liquid inflow entrance of ejector, is used for liquid by tubes rows to circulating water chennel.
The present invention also provides a kind of air-blowing vacuum membrane distillation method, and the former water in the former tank is sneaked into compressed air by air and liquid mixer then through water pump lifting pressure, enters in the membrane module and evaporates; By the external negative pressure system of the water outlet side of hydrophobic membrane assembly, produce swabbing action.
The present invention also provides a kind of use aforesaid air-blowing vacuum distillation device, is used for the air-blowing vacuum membrane distillation method, it is characterized in that: the former water side at membrane module blasts the compressed-air actuated while, applies negative pressure at the water outlet side of film.
Obtain following effect by the present invention:
The present invention has designed new film still-process: blast low-pressure compressed air on the pipeline before Yuan Shui enters the hydrophobic membrane assembly, after mixing the formation gas-liquid mixture fluid, enter in the hydrophobic membrane assembly, the external negative pressure system of outlet that steams at the hydrophobic membrane assembly constitutes the air-blowing vacuum membrane Distallation systm again.Be that key point of the present invention is, blast the compressed-air actuated while, apply negative pressure at the water outlet side of film in the former water side of film.Under the swabbing action of negative pressure, water vapour sees through hydrophobic membrane with part compressed air, and mechanism of mass transfer is not only and is utilized hydrophobic membrane both sides steam partial pressure poor, but also directly utilizes hydrophobic membrane both sides gas differential pressure mass transfer, so the mass-transfer efficiency height.Not only utilize and compressed-air actuatedly carry the purging effect secretly water vapour is delivered to the opposite side of film, improve mass-transfer efficiency, simultaneously, can also reduce vacuum requirement, reduce equipment manufacturing cost water outlet side.
Carry the purging effect secretly by compressed-air actuated, change the mechanism of mass transfer of hydrophobic membrane both sides water vapour in the membrane module, can improve the saturating film transmission speed of water vapour, thereby improve the film distillating ventilating amount.Simultaneously, effective decelerating membrane pollution.
Sweep the distillation of formula film with gas and compare, compressed air process membrane filtration, cleaning, product water water quality is good; Air is wetting fully, and air consumption is few.
Compare with the distillation of direct contact type film, cold fluid and hot fluid directly in the condensation of film contact both sides, can significantly not cut down the consumption of energy.
Compare with vacuum membrane distillation, the air compressor energy consumption is lower than vavuum pump, utilization of power efficient height; Equipment requires simple.
In system of the present invention, pending liquid can be running water, seawater, cooling system hot water of discharging or chemical products solution etc.
The present invention can be used for the desalination of water or concentrating of non-volatile liquid.
Description of drawings
Fig. 1, Fig. 2 are air-blowing vacuum distillation device process unit schematic diagrames of the present invention.
The specific embodiment
System of the present invention as shown in Figure 1 and Figure 2.Air-blowing vacuum distillation device of the present invention is from former water side, comprise connect successively as lower member:
Tank 1 in former water side setting; Be connected in tank charging pump 2; Be connected in the heater 3 of pump outlet; Be connected the air and liquid mixer 5 in water pump 2 downstreams, be used to mix compressed air and liquid, form gas-liquid mixture fluid; Compressed air inlet 4 is arranged on the blender 5, is used for going into low-pressure compressed air to former drum; Be connected in the hydrophobic membrane assembly 6 of blender 5 outlets, handle gas-liquid mixture fluid.
For heater 3, if former coolant-temperature gage reaches requirement, also desirable fpc heater 3.
In addition, former water can be preheated or not the heating or directly be heated to temperature required.
At hydrophobic membrane assembly water outlet side the negative pressure generation device is set.
At water outlet side two kinds of negative pressure presentation modes can be arranged.It is connected and composed by condenser 7, gas-liquid separator 9, water collect tank 8 and vavuum pump 10 successively just like Fig. 1.Wherein condenser 7 is connected in hydrophobic membrane assembly delivery port, makes steam and part compressed air by behind the membrane module 6, carries out condensation; The gas-liquid separator 9 that is connected with condensator outlet carries out separating of gas and liquid; Water collect tank 8 is arranged on the liquid flowing outlet of gas-liquid separator 9, is used to collect water; Vavuum pump 10 is arranged on the gas discharge outlet of gas-liquid separator 9, is used to produce the negative pressure suction.
It is two as Fig. 2, directly absorbs the liquefaction water vapour by the pure water of jetting stream vacuum system, is connected and composed by water pump 11, ejector 12, circulating water chennel 13 successively.Wherein ejector 12 is connected in hydrophobic membrane assembly delivery port, produces the negative pressure suction; Water pump 11 is arranged on the liquid inflow entrance of ejector, is used for liquid by tubes rows to circulating water chennel 13; The gas vent of ejector also is connected to circulating water chennel 13 by pipeline.
Implementation method of the present invention is: the former water in the former tank (can be preheated or not the heating or directly be heated to temperature required), through water pump 2 adherence pressures, by heater 3 (if former coolant-temperature gage reaches requirement, also desirable fpc heater 3), air and liquid mixer 5, enter in the membrane module 6 and evaporate, unevaporated fluid returns former tank 1.Compressed air enters air and liquid mixer 5 by managing 4.Under the negative pressure swabbing action of vavuum pump 10 (as Fig. 1) or ejector 12 (as Fig. 2), the steam of evaporation is carried secretly with part compressed air and is mixed in the membrane module 6, sees through hydrophobic membrane, is condensed (as Fig. 1) or absorbs liquefy (as Fig. 2) at the water outlet side of device.Carry the purging effect secretly by compressed-air actuated, change the mechanism of mass transfer of hydrophobic membrane both sides water vapour in the membrane module, can improve the saturating film transmission speed of water vapour, thereby improve the film distillating ventilating amount.Simultaneously, effective decelerating membrane pollution.
Claims (6)
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| CN200810146565A CN101664642A (en) | 2008-09-04 | 2008-09-04 | Device and method for air-blowing vacuum membrane distillation |
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| CN200810146565A CN101664642A (en) | 2008-09-04 | 2008-09-04 | Device and method for air-blowing vacuum membrane distillation |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101822931A (en) * | 2010-05-11 | 2010-09-08 | 浙江大学 | Decompression regeneration system and method for hollow fiber membrane contactor of carbon dioxide enriched absorbent solution |
| CN102417210A (en) * | 2010-09-28 | 2012-04-18 | 中国石油化工股份有限公司 | Immersed vacuum membrane distillation device and sewage treatment method thereof |
| CN103193286A (en) * | 2012-01-06 | 2013-07-10 | 中国石油化工股份有限公司 | Reverse osmosis concentrated water dissolved gas type vacuum membrane distillation water processing method |
| CN103193295A (en) * | 2012-01-06 | 2013-07-10 | 中国石油化工股份有限公司 | Immersed dissolved gas vacuum membrane distillation water processing method |
| CN104445478A (en) * | 2014-12-05 | 2015-03-25 | 耿安朝 | Rotating cross-flow type vacuum membrane distillation device |
| CN105157280A (en) * | 2015-09-18 | 2015-12-16 | 合肥海尔电冰箱有限公司 | Anti-icing fin evaporator system, fin evaporator anti-icing method and refrigerator thereof |
| CN106348393A (en) * | 2016-09-30 | 2017-01-25 | 新奥科技发展有限公司 | Membrane distillation system and membrane distillation method |
| CN106430421A (en) * | 2016-09-30 | 2017-02-22 | 新奥科技发展有限公司 | Membrane distillation system and membrane distillation method |
| CN106659944A (en) * | 2014-07-29 | 2017-05-10 | 梅杰布拉沃有限公司 | Method for the regeneration of a membrane wall in a distillation device |
| CN110124551A (en) * | 2019-06-24 | 2019-08-16 | 四川绿沃创新环保工程有限公司 | Improve the device and its process of the gas-liquid two-phase flow of membrane flux |
| CN112919660A (en) * | 2021-01-26 | 2021-06-08 | 中国人民解放军海军特色医学中心 | Air-blowing type ship cooling seawater desalination system and method |
| CN116407858A (en) * | 2023-04-13 | 2023-07-11 | 山东旭锐新材股份有限公司 | A brominated polystyrene solvent online water removal system and water removal method |
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2008
- 2008-09-04 CN CN200810146565A patent/CN101664642A/en active Pending
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101822931A (en) * | 2010-05-11 | 2010-09-08 | 浙江大学 | Decompression regeneration system and method for hollow fiber membrane contactor of carbon dioxide enriched absorbent solution |
| CN102417210A (en) * | 2010-09-28 | 2012-04-18 | 中国石油化工股份有限公司 | Immersed vacuum membrane distillation device and sewage treatment method thereof |
| CN102417210B (en) * | 2010-09-28 | 2013-11-06 | 中国石油化工股份有限公司 | Immersed vacuum membrane distillation plant and sewage treatment technology using the same |
| CN103193295B (en) * | 2012-01-06 | 2015-04-15 | 中国石油化工股份有限公司 | Immersed dissolved gas vacuum membrane distillation water processing method |
| CN103193286A (en) * | 2012-01-06 | 2013-07-10 | 中国石油化工股份有限公司 | Reverse osmosis concentrated water dissolved gas type vacuum membrane distillation water processing method |
| CN103193295A (en) * | 2012-01-06 | 2013-07-10 | 中国石油化工股份有限公司 | Immersed dissolved gas vacuum membrane distillation water processing method |
| CN103193286B (en) * | 2012-01-06 | 2015-02-11 | 中国石油化工股份有限公司 | Reverse osmosis concentrated water dissolved gas type vacuum membrane distillation water processing method |
| CN106659944A (en) * | 2014-07-29 | 2017-05-10 | 梅杰布拉沃有限公司 | Method for the regeneration of a membrane wall in a distillation device |
| CN106659944B (en) * | 2014-07-29 | 2019-08-13 | 梅杰布拉沃有限公司 | For carrying out regeneration method to the membranous wall in distilling apparatus |
| CN104445478B (en) * | 2014-12-05 | 2016-06-01 | 耿安朝 | A kind of rotation cross-current type vacuum membrane distillation device |
| CN104445478A (en) * | 2014-12-05 | 2015-03-25 | 耿安朝 | Rotating cross-flow type vacuum membrane distillation device |
| CN105157280A (en) * | 2015-09-18 | 2015-12-16 | 合肥海尔电冰箱有限公司 | Anti-icing fin evaporator system, fin evaporator anti-icing method and refrigerator thereof |
| CN105157280B (en) * | 2015-09-18 | 2019-01-18 | 合肥海尔电冰箱有限公司 | Anti-freeze evaporator fin system and its refrigerator |
| CN106348393A (en) * | 2016-09-30 | 2017-01-25 | 新奥科技发展有限公司 | Membrane distillation system and membrane distillation method |
| CN106430421A (en) * | 2016-09-30 | 2017-02-22 | 新奥科技发展有限公司 | Membrane distillation system and membrane distillation method |
| CN110124551A (en) * | 2019-06-24 | 2019-08-16 | 四川绿沃创新环保工程有限公司 | Improve the device and its process of the gas-liquid two-phase flow of membrane flux |
| CN112919660A (en) * | 2021-01-26 | 2021-06-08 | 中国人民解放军海军特色医学中心 | Air-blowing type ship cooling seawater desalination system and method |
| CN116407858A (en) * | 2023-04-13 | 2023-07-11 | 山东旭锐新材股份有限公司 | A brominated polystyrene solvent online water removal system and water removal method |
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Open date: 20100310 |