CN101874983A - Method and device for evaporation concentration of depressurized membrane - Google Patents
Method and device for evaporation concentration of depressurized membrane Download PDFInfo
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- CN101874983A CN101874983A CN2009100686388A CN200910068638A CN101874983A CN 101874983 A CN101874983 A CN 101874983A CN 2009100686388 A CN2009100686388 A CN 2009100686388A CN 200910068638 A CN200910068638 A CN 200910068638A CN 101874983 A CN101874983 A CN 101874983A
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Abstract
The invention provides a method for evaporation concentration of a depressurized bubbling membrane, which comprises the following steps of: simultaneously performing a membrane distillation process together with three processes of membrane drying, gas flushing of the surface of the membrane and floatation edulcoration with a treatment liquid by using an air bubbling function; simultaneously, using a pumping function generated by applying a negative pressure on a water yielding side of the membrane to obtain a higher water yielding flux; and unintermittently compressing air for continuous online bubbling while performing depressurized pumping, and obtaining a higher membrane water yielding flux while controlling membrane fouling and membrane hydrophilicity. The method has simple equipment, is convenient to operate, and can realize automatic control easily.
Description
Technical field
The present invention relates to a kind of film evaporation concentrating method and device thereof, relate in particular to the film method for separating and processing and the device thereof of water purified treatment and chemical separating.
Background technology
Film distillation technology and 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.Therefore, in recent years, film distillation technology has obtained extensive concern.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.
Pressure reducing film distillation is that the side that sees through in hydrophobic membrane applies a negative pressure, will be retracted to through the water vapour of perforated membrane in the membrane module condenser in addition and carry out condensation liquefaction.
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.
But, generally all exist in the film still-process: the hydrophobic membrane hydrophiling leakage problems that 1, occurs in the hydrophobic membrane use.2, along with the carrying out of film evaporating concentration process, material liquid constantly is concentrated, and causes in the feed liquid pollutant levels such as COD to increase, and makes membrane pollution problem serious.Though 3, conventional pressure reducing film distillation process product water water quality is good, the efficient height, operation energy consumption is bigger.These all are that film distillation technology is realized the essential problem that solves of industrial applications.
Summary of the invention
The objective of the invention is to overcome defective of the prior art, a kind of new film evaporation and concentration (Vacuum Bubble Membrane Distillation, VBMD) method and device thereof are provided.
The invention provides a kind of decompression blister film evaporation concentration device, it is characterized in that, comprise: at the former tank of former water side setting with lower member; Membrane module is used to handle former water; Be connected in the supply-water pump on the former tank, the pending liquid in the former tank is infeeded membrane module; Air blast is arranged on the outside of membrane module, and air infeeds in the membrane module through the air blast supercharging; Be connected in the first order condenser on the membrane module, be used for the air that blasts is carried out preheating; Second level condenser is communicated with first order condenser, is used for containing wet air and carrying out condensation saturated, obtains distillation and produces water; The chemical agent groove is connected between membrane module and the former tank, holds medicaments such as flocculant, and above-mentioned medicament infeeds in the membrane module through measuring pump; Dense water collecting container is arranged on the membrane module below, and the dense water of discharging from membrane module flows under the influence of gravity into dense water collecting container; Tank, the liquid in the collection container flow into tank under the gravity effect; Be provided with the immersion perforated membrane in the tank; Vavuum pump is producing the suction of water side generation negative pressure.
Membrane module is provided with the film silk, and compressed air is gone into bubble by the film silk to former drum.
Dense water out and overflow pipe are set in the membrane module, and the dense water after the evaporation flocculation flows out membrane module by the air supporting effect through overflow pipe and dense water out.
Dense water collecting container has the inlet valve often opened, normally closed air intake valve and normally closed outlet valve, also be provided with liquid-level switch in the dense water collecting container, when the liquid water level that flows into container reaches liquid-level switch, imported valve is closed automatically, air intake valve, outlet valve are opened automatically, and the liquid in the container flows under the influence of gravity into tank.
Tank also is provided with low level outlet and supernatant outlet; Through after placing the immersion membrane filtering of tank, supernatant turns back to membrane module; Mud is then discharged outside the tank.
Air blast is arranged on the outside of membrane module, and air enters first order condenser and carries out preheating through the air blast supercharging.
The present invention also provides a kind of decompression blister film evaporating concentrating method, it is characterized in that: film still-process and fenestra drying, the flushing of film surface gas, three processes of treatment fluid air supporting removal of impurities are carried out simultaneously; In film still-process and the fenestra dry run, the former water in the former tank enters through water pump and carries out the film evaporation in the membrane module; In the film surface gas flushing process, compressed air enters membrane module by the hydrophobic membrane bubbling, and the film surface is washed; In the treatment fluid air supporting removal of impurities process, medicaments such as flocculant are squeezed in the membrane module by measuring pump; Dense water after the evaporation flocculation flows out membrane module by the air supporting effect, flows under the influence of gravity into the tank of below; Through after placing the immersion membrane filtering of tank, supernatant returns membrane module; Compressed air enters membrane module by the hydrophobic membrane bubbling, after the saturated moisture absorption, under the decompression swabbing action, enters condenser liquefaction, obtains to produce water.
In the film evaporation process, blast air continuously, simultaneously, producing the suction of reducing pressure continuously of water side.
Obtain following effect by the present invention:
The present invention is characterised in that, by decompression suction and air for continuous online bubbling intermittently not: 1, make compressed air pass fenestra, prevent the hydrophiling that moisture condenses and causes in fenestra, thereby keep the drying property of hydrophobic membrane; 2, prevent pollutant at the film surface deposition, solve membrane pollution problem; 3, by in feed liquid, adding simultaneously chemical agent such as flocculant, the pollutant flocculation is blown take the film evaporation tank out of, realize that high concentration concentrates; 4, utilize the moisture absorption effect of carrying secretly and the decompression swabbing action of air bubble, the steam band from the film evaporation tank, is not needed high pressure air, operation energy consumption greatly reduces; 5, compressed air is through the filtration of hydrophobic membrane, and product water water quality is good.
Equipment is simple, and is easy to operate, is easy to realize automatic control.
Description of drawings
Fig. 1 is a decompression blister film evaporating and concentrating process device schematic diagram of the present invention.
The specific embodiment
System of the present invention as shown in Figure 1.The air-blowing vacuum distillation device that the present invention relates to is from former water side, comprise connect successively as lower member:
Former tank 1 in former water side setting; Membrane module 5 is used to handle former water; Be connected in the supply-water pump 2 on the former tank, the pending liquid in the former tank 4 is infeeded membrane module 5 by entering the mouth; Be arranged at the compressed air inlet 25 of membrane module below, air is infeeded in the membrane module 5; Be arranged on the film silk 26 in the membrane module 5, go into bubble to former drum by film silk 26; Be connected in the first order condenser 23 on the membrane module 5, be used for the air that blasts is carried out preheating; Second level condenser 28 is communicated with first order condenser, is used for containing wet air and carrying out condensation saturated, obtains distillation and produces water; Distilled water collection container 29 is collected condensed distilled water; Chemical agent groove 31 is connected between membrane module 5 and the former tank 1, holds medicaments such as flocculant, and above-mentioned medicament infeeds in the membrane module 5 in feeding opening 3 through measuring pump 32; Dense water out 7 and overflow pipe 6 are set in the membrane module 5, and the dense water after the evaporation flocculation flows out membrane module 5 by the air supporting effect through overflow pipe 6 and dense water out 7; Dense water collecting container 44 is arranged on membrane module 5 belows, and the dense water of discharging from membrane module 5 flows into dense water collecting container 44 via inlet valve 41 under the gravity effect; The inlet valve 41 that dense water collecting container 44 connects is often opened, and air intake valve 42, outlet valve 45 are normally closed.When the liquid water level that flows into container 44 reached liquid-level switch 43, imported valve 41 was closed automatically, and air intake valve 42, outlet valve 45 are opened automatically, made liquid in the container 44 under the gravity effect, 8 flowed into tanks 9 by entering the mouth; Be provided with immersion perforated membrane 10 in the tank 9, tank 9 also is provided with low level outlet 12 and supernatant outlet; After filtering through the immersion perforated membrane 10 that places tank 9, supernatant is by the control of valve 13,11 turns back to membrane module 5 by entering the mouth; Mud is then discharged outside the tank by low level outlet 12; Air blast 21 is arranged on the outside of membrane module 5, and air is through air blast 21 superchargings, enter first order condenser 23 through air intake 22, after the preheating, compressed air intlet 25 enters membrane module 5, enters in the pending liquid through film silk 26 bubblings, after the at high temperature saturated moisture absorption, flow out membrane module 5 through outlet 27, enter first order condenser 23, carry out heat exchange with new air, then in condenser 28 by the cold water total condensation, condensed water flows into container 29.More than unaccounted Reference numeral 30 be vavuum pump.
Decompression blister film evaporating concentrating method provided by the invention is that film still-process and fenestra drying, the flushing of film surface gas, three processes of treatment fluid air supporting removal of impurities are carried out simultaneously.Former water in the former tank enters and carries out the film evaporation in the membrane module through water pump; By measuring pump medicaments such as flocculant are squeezed in the membrane module; Dense water after the evaporation flocculation flows out membrane module by the air supporting effect, flows under the influence of gravity into the tank of below; Through after placing the immersion membrane filtering of tank, supernatant returns former tank; Mud is then discharged outside the tank; Compressed air enters membrane module by the hydrophobic membrane bubbling, after the saturated moisture absorption, under the decompression swabbing action, enters condenser liquefaction, obtains to produce water.
Former water can be preheated or not the heating or directly be heated to the evaporation temperature required, the film evaporating temperature is generally 50～90 ℃.
According to the process lot size of film vapo(u)rization system, need preset air section height ha, make the boiling shape gas-liquid mixed phase in the membrane module 5, fully gas-liquid separation under the gravity effect prevents to produce water conductivity because the spittle of water droplet is carried the phenomenon influence secretly.It is 0.3～3.0 meter that the ha value can be set.
Process lot size according to the film vapo(u)rization system, need preset the saturated moisture absorption liquid level of air bubble h, h is relevant with the compressed air air pressure that blasts, and when air bubble through hydrophobic membrane is risen in hot liquid naturally, with hot liquid is arranged enough interface times of contact and is heated and humidifying.It is 0.3～3.0 meter that the h value can be set.
The present invention is characterised in that, by decompression suction air for continuous online bubbling intermittently not simultaneously, pollutes and the hydrophilic while of film at controlling diaphragm, obtains higher film product water flux.
Equipment is simple, and is easy to operate, is easy to realize automatic control.
Claims (8)
1. a decompression blister film evaporation concentration device is characterized in that, comprises with lower member:
Former tank (1) in former water side setting;
Membrane module (5) is used to handle former water;
Be connected in the supply-water pump (2) on the former tank, the pending liquid in the former tank is infeeded membrane module (5);
Air blast (21) is arranged on the outside of membrane module (5), and air infeeds in the membrane module (5) through air blast (21) supercharging;
Be connected in the first order condenser (23) on the membrane module (5), be used for the air that blasts is carried out preheating;
Second level condenser (28) is communicated with first order condenser, is used for containing wet air and carrying out condensation saturated, obtains distillation and produces water;
Chemical agent groove (31) is connected between membrane module (5) and the former tank (1), holds medicaments such as flocculant, and above-mentioned medicament infeeds in the membrane module (5) through measuring pump (32);
Dense water collecting container (44) is arranged on membrane module (5) below, and the dense water of discharging from membrane module (5) flows under the influence of gravity into dense water collecting container (44);
Tank (9), the liquid in the collection container (44) flow into tank (9) under the gravity effect;
Be provided with immersion perforated membrane (10) in the tank (9);
Vavuum pump (30) is producing the suction of water side generation negative pressure.
2. decompression blister film evaporation concentration device according to claim 1 is characterized in that:
Membrane module (5) is provided with film silk (26), and compressed air is gone into bubble by film silk (26) to former drum.
3. decompression blister film evaporation concentration device according to claim 1 is characterized in that:
Dense water out (7) and overflow pipe (6) are set in the membrane module (5), and the dense water after the evaporation flocculation flows out membrane module (5) by the air supporting effect through overflow pipe (6) and dense water out (7).
4. decompression blister film evaporation concentration device according to claim 1 is characterized in that:
Dense water collecting container (44) has the inlet valve (41) often opened, normally closed air intake valve (42) and normally closed outlet valve (45), also be provided with liquid-level switch (43) in the dense water collecting container (44), when the liquid water level that flows into container (44) reaches liquid-level switch (43), imported valve (41) is closed automatically, air intake valve (42), outlet valve (45) are opened automatically, and the liquid in the container (44) flows under the influence of gravity into tank (9).
5. decompression blister film evaporation concentration device according to claim 5 is characterized in that:
Tank (9) also is provided with low level outlet (12) and supernatant outlet; After immersion perforated membrane (10) filtration that places tank (9), supernatant turns back to membrane module (5); Mud is then discharged outside the tank.
6. decompression blister film evaporation concentration device according to claim 1 is characterized in that:
Air blast (21) is arranged on the outside of membrane module (5), and air enters first order condenser (23) and carries out preheating through air blast (21) supercharging.
7. decompression blister film evaporating concentrating method is characterized in that:
Film still-process and fenestra drying, the flushing of film surface gas, three processes of treatment fluid air supporting removal of impurities are carried out simultaneously;
In film still-process and the fenestra dry run, the former water in the former tank enters through water pump and carries out the film evaporation in the membrane module;
In the film surface gas flushing process, compressed air enters membrane module by the hydrophobic membrane bubbling, and the film surface is washed;
In the treatment fluid air supporting removal of impurities process, medicaments such as flocculant are squeezed in the membrane module by measuring pump; Dense water after the evaporation flocculation flows out membrane module by the air supporting effect, flows under the influence of gravity into the tank of below; Through after placing the immersion membrane filtering of tank, supernatant returns membrane module;
Compressed air enters membrane module by the hydrophobic membrane bubbling, after the saturated moisture absorption, under the decompression swabbing action, enters condenser liquefaction, obtains to produce water.
8. method as claimed in claim 2 is characterized in that: in the film evaporation process, blast air continuously, simultaneously, producing the suction of reducing pressure continuously of water side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100686388A CN101874983B (en) | 2009-04-28 | 2009-04-28 | Method and device for evaporation concentration of depressurized membrane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100686388A CN101874983B (en) | 2009-04-28 | 2009-04-28 | Method and device for evaporation concentration of depressurized membrane |
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| Publication Number | Publication Date |
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| CN101874983A true CN101874983A (en) | 2010-11-03 |
| CN101874983B CN101874983B (en) | 2012-04-18 |
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| CN2009100686388A Expired - Fee Related CN101874983B (en) | 2009-04-28 | 2009-04-28 | Method and device for evaporation concentration of depressurized membrane |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103803669A (en) * | 2013-12-26 | 2014-05-21 | 许昌学院 | Desalination device and desalination method for brackish water and seawater through air purging and vacuum membrane distillation |
| CN106237649A (en) * | 2016-07-27 | 2016-12-21 | 大唐环境产业集团股份有限公司 | A kind of Membrane Materials crystallization treatment device and method |
| CN109336222A (en) * | 2018-10-25 | 2019-02-15 | 浙江利欧环保科技有限公司 | Immersion gravity stream ceramic membrane microkinetic ultrafiltration system sewage disposal device and method |
| CN109966923A (en) * | 2019-03-13 | 2019-07-05 | 南京利福达膜科技有限公司 | A kind of decompression film evaporator of evaporation and heat-exchange one |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1124873C (en) * | 1998-12-08 | 2003-10-22 | 天津纺织工学院膜天膜技术工程公司 | Cleaning method and corresponding membrane assembly of externally pressured hollow fiber membrane |
| RU2256614C2 (en) * | 2003-10-16 | 2005-07-20 | Открытое акционерное общество "Сибирско-Уральская алюминиевая компания" | Bauxite leaching process |
| CN101204641A (en) * | 2006-12-22 | 2008-06-25 | 天津工业大学 | Treating system for film evaporating concentrated liquid and method therefor |
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2009
- 2009-04-28 CN CN2009100686388A patent/CN101874983B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103803669A (en) * | 2013-12-26 | 2014-05-21 | 许昌学院 | Desalination device and desalination method for brackish water and seawater through air purging and vacuum membrane distillation |
| CN106237649A (en) * | 2016-07-27 | 2016-12-21 | 大唐环境产业集团股份有限公司 | A kind of Membrane Materials crystallization treatment device and method |
| CN109336222A (en) * | 2018-10-25 | 2019-02-15 | 浙江利欧环保科技有限公司 | Immersion gravity stream ceramic membrane microkinetic ultrafiltration system sewage disposal device and method |
| CN109966923A (en) * | 2019-03-13 | 2019-07-05 | 南京利福达膜科技有限公司 | A kind of decompression film evaporator of evaporation and heat-exchange one |
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| CN101874983B (en) | 2012-04-18 |
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