CN100420509C - Membrane cleaning device and method in membrane separating technology and its application - Google Patents

Membrane cleaning device and method in membrane separating technology and its application Download PDF

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CN100420509C
CN100420509C CNB2005101031224A CN200510103122A CN100420509C CN 100420509 C CN100420509 C CN 100420509C CN B2005101031224 A CNB2005101031224 A CN B2005101031224A CN 200510103122 A CN200510103122 A CN 200510103122A CN 100420509 C CN100420509 C CN 100420509C
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air
pulse
inlet pipeline
pipeline
backwash inlet
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CN1931419A (en
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李宏伟
李怀印
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China Petroleum and Chemical Corp
Sinopec Exploration and Production Research Institute
China Petrochemical Corp
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China Petroleum and Chemical Corp
Sinopec Exploration and Production Research Institute
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Abstract

The membrane cleaning device includes one back washing water intake pipeline connected to the membrane filter, and one pulse air pipeline connected to the back washing water intake pipeline to adding compressed air into the water flow of the back washing water intake pipeline. The pulse air pipeline includes one pulse valve connected directly to the back washing water intake pipeline, one air compressor with air storing packet and connected to the pulse valve and one PLC control system to control the pulse valve. The device of the present invention can generate high strength pulse air-mixing water flow to clean membrane, especially hollow fiber membrane effectively. The present invention may be used widely in the water flooding treatment of hyposmosis oil field, pure water preparation, product purification, waste water treatment, etc.

Description

Film cleaning device, cleaning method and application thereof in a kind of membrane separation technique
Technical field
The present invention relates to a kind of membrane separation technique, particularly relate to film cleaning method, device in a kind of membrane separation technique and the application of handling as recycle-water at water injection in low-permeability oilfield water treatment, pure water preparation, product purification and waste water thereof.
Background technology
Membrane material is a kind of porous media, and the film separation process is exactly the process that the solvent in the processed feed liquid is trapped by film, solute under pressure promotes.
One of key of application of membrane separation technology is exactly the cleaning and regeneration technology of film.Although micro-filtration mainly has the effect of screening cut-off filter, absorption is less in the hole in general.But it almost is inevitable that concentration polarization and film pollute.In order to keep higher membrane flux, suitable cleaning technique is most important.
In membrane separation technique, hollow-fibre membrane is a kind of broad-spectrum separation membrane.Because the good performance of hollow-fibre membrane, it is widely used in water injection in low-permeability oilfield water treatment, sewage disposal, high standard with fields such as water treatments, although hollow-fibre membrane allows by the backwash mode film to be cleaned, but because film pollution mechanism complexity, polluter are various informative, especially for being deep into the pollutant of membranous wall inside, depend merely on water and dash and to be difficult to gather effect sometimes, and often will expend a large amount of filtered waters.
For solving the problems of the technologies described above, it is that the method and apparatus that adopts the pulse air water to mix recoil comes film is cleaned that a kind of practice is arranged in the prior art.For example, in Chinese patent CN1415558A and the disclosed microfiltration equipment of Chinese patent CN1325957A, all relate to the mode of air water mixing recoil and carry out the film cleaning.
Wherein, patent of invention " middle water continuous Microfiltration cleaning system " (patent No. is 01133605.6), related to a kind of pulse air water back washing technology, its technical essential is, on gas piping, be connected in series a two position three-way valve and a cylinder successively, this two position three-way valve preestablishes, conversion on time, and cylinder stroke is adjustable, adjustable in pressure; The water route directly links to each other with gas circuit by a threeway.According to its technical scheme, its backwash process is " two position three-way valve is subjected to the regularly control of switching signal, realizes the pulsed recoil ".The backwash course of action of explaining from its Figure of description is, two position three-way valve is opened under the timing signal effect, compressed air enters cylinder, the motion of promotion cylinder piston, air is extruded, and with the backwash water " head-on collision " in the water lines, air water enters the membrane module water outlet side simultaneously, oppositely, realize the purpose of cleaning by face.
Another invention " a kind of inorganic ceramic membrane microfilter for automatic low-temp bacteria removal of beer " (patent No. is 0114590.8), just the same with the backwash technical scheme that " middle water continuous Microfiltration cleaning system (patent No. is 01133605.6) " adopts.
But there is following technical disadvantages in above-mentioned method and apparatus,
(1) above-mentioned two inventions utilize the keying of two position three-way valve to control to gas, and normally closed flap is opened back compressed air and entered cylinder under signal drives, and promotion piston release compressed air enters the backwash water in the water route.Two position three-way valve does not possess the fast opening and closing function, and motion extruded air by piston after air entered cylinder, and a pulse process at least also has the several seconds, can't form tangible pulse effects.
(2) compressed gas contacts with the front of water and also is difficult to realize full and uniform mixing, and gas is disperseed fast, forms tiny bubble, and the effect of air water back washing is had a greatly reduced quality.
(3) two inventions all connect a cylinder behind triple valve, air pulse is regulated kinetic energy through cylinder and will be reduced significantly.
(4) because the mechanical flap of plain triple valve can not adapt to frequent keying requirement, limited backwash frequency, this use to film is totally unfavorable.Because the backwash process of a film in the cleaning frequency is not that one or several adds gas pulse and can gather effect, but needs the concentrated effect of the frequent pulse aerated flow of certain time, could thoroughly clean up, and recovers membrane flux to greatest extent.
Therefore the recoil cleaning performance of said apparatus is relatively poor.The film cleaning device that needs a kind of efficient more and simple possible is to prolong the service life of film.
Summary of the invention
According to the technical problem that exists in the prior art, the inventor has invented a kind of apparatus and method that film cleans that are used for through long-term experiment and research.
Film cleaning device in a kind of membrane separation technique is achieved in that and comprises film filter 1, backwash inlet pipeline 2 and pulse of air pipeline 3; Described film filter 1 is connected with backwash inlet pipeline 2, and pulse of air pipeline 3 is connected with this backwash inlet pipeline 2, and the current in the backwash inlet pipeline periodically mix compressed air.
Also include the pulse valve 4 and the air compressor 5 that can produce the impulse hunting air-flow in the described film cleaning device; Described pulse valve 4 directly with after pulse of air pipeline 3 is connected puts in the described backwash inlet pipeline 2; Described air compressor 5 is connected with pulse valve 4.
In the device of the present invention, because pulse valve directly links to each other with the backwash inlet pipeline, thereby compare with the structure of centre intervention cylinder, device of the present invention can directly be applied to air pulse in the backwash water, produces more high-intensity aerated flow, and repercussion effect is better.
In addition, the present invention is in order to obtain better pulsatile effect, pulse valve described in the concrete technical scheme adopts the jet ash pulse valve that blows, this is because it has the advantages that but moment starts, be Millisecond its start-up time, pulse is clear, intensity is high, and pulse width, pulse frequency and always give the gas time can be in PLC (programmable logic controller (PLC)) control adjusting down, thereby produce a series of pulse aerated flow in a period of time, polluted membrane is continued and effectively concussion flushing.The pulse valve opening time is the 30-100 millisecond; It starts frequency is 1-3 time/second.And be second level the start-up time of triple valve of the prior art, and the back also has been connected in series a cylinder, is actually the piston that utilizes cylinder interior and makes air pulse, mixes its pulsatile effect of back and not obvious in the water.
In the concrete device, described film cleaning device includes air purifier 6, inserts air purifier 6 between described pulse valve 4 and air compressor 5.Promptly inserting air purifier between described pulse valve and air compressor, is clean air with the air of guaranteeing to enter the backwash inlet pipeline.
In order to improve the air water mixed effect, make aeration more even, described pulse of air pipeline 3 puts in backwash inlet pipeline 2 by groove pipe 7.
Stretch into backwash inlet pipeline 2 places at pulse of air pipeline 3 and comprise a contraction section 8 and a diffuser 9 that produces Venturi effect; Described groove pipe 7 is inserted in the backwash inlet pipeline 2 that puts in contraction section 8 and place, diffuser 9 centre positions.
Be that pulse of air pipeline in apparatus of the present invention stretches into backwash inlet pipeline middle part by a groove pipe, clean compressed air is injected water.The backwash inlet pipeline with pulse of air pipeline junction (aerating point upstream and downstream side), be designed to a contraction section and diffuser, be used for producing Venturi effect, strengthen the aeration effect.
The film cleaning method of using according to above-mentioned film cleaning device is,
Comprise film filter 1, backwash inlet pipeline 2 and pulse of air pipeline 3 in the described method; Described film filter 1 is connected with backwash inlet pipeline 2, and pulse of air pipeline 3 is connected with this backwash inlet pipeline 2, and the current in the backwash inlet pipeline periodically mix compressed air;
Also include the pulse valve 4 and the air compressor 5 that can produce the impulse hunting air-flow in the described film cleaning method; Described pulse valve 4 directly with after pulse of air pipeline 3 is connected puts in the described backwash inlet pipeline 2; Described air compressor 5 is connected with pulse valve 4;
Described film cleaning method is, described air compressor 5 produces compressed gas, pulse valve 4 periodically opens and closes under special PLC control, produce periodic high voltage pulse air-flow, promptly the current in the backwash inlet pipeline 2 are provided a high voltage pulse air-flow, make backwash water become the pulse aerated flow film is carried out anti-cleaning operation by steadily even stream;
The aeration ratio that this method is regulated current by the parameter of control impuls valve 4 is carried out oscillating impulse to film and is cleaned; Described aeration ratio starts frequency and opening time decision by pulse valve 4;
In the described method, described pulse of air pipeline 3 puts in backwash inlet pipeline 2 by groove pipe 7; And on backwash inlet pipeline 2, stretch into backwash inlet pipeline 2 places at pulse of air pipeline 3 and comprise a contraction section 8 and a diffuser 9 that produces Venturi effect; Described groove pipe 7 is inserted in the backwash inlet pipeline 2 that puts in contraction section 8 and place, diffuser 9 centre positions;
Described film cleaning method has been used the Venturi tube mixed method, after promptly air pulse enters in the water of contraction section 8, in diffuser 9 subsequently along with water flow velocity reduce progressively to be released into micro air bubble, form uniform aerated flow.
The present invention can be used for water injection in low-permeability oilfield water treatment, pure water preparation, product purification and the waste water fields such as processing as recycle-water.
The mode of operation of film cleaning device of the present invention is specially, air compressor by band gas storage bag produces compressed gas, periodically moment opens and closes pulse valve, current in the backwash inlet pipeline are provided a high voltage pulse air-flow, make backwash water become the pulse aerated flow by steadily even stream, by the aeration ratio that control impuls valve parameter can be regulated current, film is carried out oscillating impulse clean.Described aeration ratio starts frequency and opening time decision by pulse valve, and wherein the pulse valve operating frequency is preferred 1-3 time/second; Preferred 50-100 millisecond of pulse valve opening time (pulse width).
Outside the cleaning fluid that film cleans dewaters, can also select to mix the water of organic solvent etc. as required.By screening suitable Chemical cleaning prescription and backwash operation condition, can guarantee that irreversible silting up do not appear in film, prolongs its life-span to greatest extent.
The advantage of film cleaning device of the present invention:
1. in apparatus of the present invention, pulse valve directly links to each other with the backwash inlet pipeline, directly air pulse is applied in the backwash water, can produce the high strength aerated flow, and backwash is effective.
2. apparatus of the present invention adopt the jet ash pulse valve that blows, but moment (Millisecond) opens and closes, pulse is clear, intensity is high, and in pulse width, pulse frequency and backwash cycle total aerating time all can regulate by PLC according to actual conditions, make the backwash best results.
3. apparatus of the present invention are injected water with the groove pipe that stretches into backwash water pipeline middle part with clean compressed air, good mixing effect, and aeration is even.Near the aerating point backwash inlet pipeline has a contraction section and diffuser, can produce Venturi effect, strengthens the aeration effect.
4. the most important index of characterization of membrane cleaning performance is the membrane flux recovery rate, the membrane flux after promptly film cleans and the ratio of initial flux.The film cleaning technique that current domestic literature is openly reported, membrane flux recovery rate are generally 55%~76%, and some technology can reach 80% in the short time in the early stage, and patent of invention 01133605.6 does not disclose the index of cleaning performance aspect.The present invention is at the use initial stage, and the membrane flux recovery rate can reach 95%, reduces gradually later on, finally is stabilized in about 85% by adjusting operational factor, obviously is better than prior art.
The present invention compares with patent of invention of the prior art " middle water continuous Microfiltration cleaning system " (patent No. is 01133605.6) and " a kind of inorganic ceramic membrane microfilter for automatic low-temp bacteria removal of beer " (patent No. is 00114590.8),
(1) at first in the control of gas circuit, what the present invention adopted is the jet ash pulse valve that blows, its control assembly is the diaphragm of being made by special material, has the function that high flow capacity, long-life and high-speed switch switch, can open and close with interior finishing once at 50 milliseconds, pulse width (pulse flap opening time) and interpulse period can be regulated under the control system effect, according to different situation optimum organization, realize the optimization of backwash effect.The application of pulse valve aspect bag-type dust is very extensive and ripe, does not clean the field but also be applied to film.In principle, pulse valve is applied to the bag-type dust aspect, mainly is to utilize it to open quick, the huge air pulse that the back forms fast, forms the local decompression district, the air of introducing several times shakes disturbance to the dust in the cloth bag, the dirt cake is come off reach the purpose of dedusting.Pulse valve is applied to film cleans the field. mainly be to utilize its fast opening and closing function, during unlatching can with compressed air with high strength and fast mode be incorporated in the backwash water, form air pulse, when adding fashionable by certain blanking time, can produce a series of air water pulse, agitate effect thereby produce, strengthen the cleaning performance of fenestra (in the film) and film surface (film is outer).Ripe PLC control technology can make cleaning performance the best according to opening time of different application scenario free adjustment pulse valves and action blanking time.
(2) have only a pulse valve to carry out air-flow control on the air pipe line, the back does not connect cylinder, but directly enters in the backwash water, has eliminated the cushioning effect of cylinder, can form clear and strong air pulse under pulse valve control.
(3) after air is introduced in the water, can carry out Rapid and uniform mixing, also very big to the influence of air water backwash effect.Mix if only utilize a threeway to carry out air water simply, the air water head-on collision, air bubble is difficult to fragmentation and dissolves in the water with the form of micro air bubble.The present invention is deep into the centre of conduit position with air hose, and adopted the Venturi tube hybrid technology, after gas enters in the water of convergent pipeline section, can be in diffuser subsequently along with flow velocity reduce progressively to be released into micro air bubble, form the aerated flow that mixes.Because aerated flow is low than pure water viscosity, surface-active is strong, and is better to the oil substances cleaning performance attached to fenestra inside, thereby and this class material often other cleaning methods be difficult to gather imitate and cause the film operation conditions to continue the major reason that worsens.When the doughnut membrane module adopted backwash technology of the present invention, the vibration that continual pulse aerated flow can also make the film silk produce controllable intensity was strengthened the surface and is washed by rubbing with the hands, improves the surface clean effect.
To sum up, the present invention has outstanding technique effect and significant technological progress, has novelty and creationary.
Description of drawings
Fig. 1 is the schematic diagram of film cleaning device of the present invention
Fig. 2 is the enlarged diagram of backwash inlet pipeline and pulse of air pipeline junction in the film cleaning device of the present invention.
The specific embodiment
Fig. 1 is the schematic diagram of film cleaning device of the present invention, 1: film filter 2: backwash inlet pipeline 3: pulse of air pipeline 4: pulse valve 5: air compressor 6: air purifier.
Film cleaning device in a kind of membrane separation technique is achieved in that and comprises film filter 1, backwash inlet pipeline 2 and pulse of air pipeline 3; Described film filter 1 is connected with backwash inlet pipeline 2, and pulse of air pipeline 3 is connected with this backwash inlet pipeline 2, and the current in the backwash inlet pipeline periodically mix compressed air.
Also include the pulse valve 4 and the air compressor 5 that can produce the impulse hunting air-flow in the described film cleaning device; Described pulse valve 4 directly with after pulse of air pipeline 3 is connected puts in the described backwash inlet pipeline 2; Described air compressor 5 is connected with pulse valve 4.
In the device of the present invention, because pulse valve directly links to each other with the backwash inlet pipeline, thereby compare with the structure of centre intervention cylinder, device of the present invention can directly be applied to air pulse in the backwash water, produces more high-intensity aerated flow, and repercussion effect is better.
In addition, the present invention is in order to obtain better pulsatile effect, and the pulse valve described in the concrete technical scheme adopts the jet ash pulse valve that blows, this is because it has the advantages that but moment starts, be Millisecond its start-up time, and pulse is clear, intensity is high, and characteristics such as pulse width is adjustable.The pulse valve opening time is the 30-100 millisecond; It starts frequency is 1-3 time/second.And be second level the start-up time of triple valve of the prior art, and the back also has been connected in series a cylinder, is actually the piston that utilizes cylinder interior and makes air pulse, mixes its pulsatile effect of back and not obvious in the water.
Described film cleaning device includes air purifier 6, inserts air purifier 6 between described pulse valve 4 and air compressor 5.Promptly inserting air purifier between described pulse valve and air compressor, is clean air with the air of guaranteeing to enter the backwash inlet pipeline.
Fig. 2 is the enlarged diagram of backwash inlet pipeline and pulse of air pipeline junction in the film cleaning device of the present invention.7: groove pipe 8: contraction section 9: diffuser.
" water inlet " end of indicating among Fig. 1 reality in the cleaning and regeneration process of film is the water side after cleaning, and " water outlet " indicated among figure end is connected with the inlet end of intaking by a threeway.In the cleaning and regeneration process of film, " water outlet " end is by valve closing, and backwash water, air-flow and normal process water (flow) direction (flowing to " water outlet " end from " water inlet " end) enter film on the contrary, realize cleaning performance.
In order to improve the air water mixed effect, make aeration more even, described pulse of air pipeline 3 puts in backwash inlet pipeline 2 by groove pipe 7.
Stretch into backwash inlet pipeline 2 places at pulse of air pipeline 3 and comprise a contraction section 8 and a diffuser 9 that produces Venturi effect; Described groove pipe 7 is inserted in the backwash inlet pipeline 2 that puts in contraction section 8 and place, diffuser 9 centre positions.
Be that pulse of air pipeline in apparatus of the present invention stretches into backwash inlet pipeline middle part by a groove pipe, clean compressed air is injected water.The backwash inlet pipeline with pulse of air pipeline junction (aerating point upstream and downstream side), be designed to a contraction section and diffuser, be used for producing Venturi effect, strengthen the aeration effect.
The mode of operation of film cleaning device of the present invention is specially, air compressor by band gas storage bag produces compressed gas, periodically moment opens and closes pulse valve, current in the backwash inlet pipeline are provided a high voltage pulse air-flow, make backwash water become the pulse aerated flow by steadily even stream, by the aeration ratio that control impuls valve parameter can be regulated current, film is carried out oscillating impulse clean.Described aeration ratio starts frequency and opening time decision by pulse valve, and wherein the pulse valve operating frequency is preferred 1-3 time/second; Preferred 50-100 millisecond of pulse valve opening time (pulse width).

Claims (7)

1. the film cleaning device in the membrane separation technique, it comprises film filter (1), backwash inlet pipeline (2) and pulse of air pipeline (3); Described film filter (1) is connected with backwash inlet pipeline (2), and pulse of air pipeline (3) is connected with this backwash inlet pipeline (2), and the current in backwash inlet pipeline (2) periodically mix compressed air; It is characterized in that:
Also include the pulse valve (4) and the air compressor (5) that can produce the impulse hunting air-flow in the described film cleaning device;
Described pulse valve (4) directly with after pulse of air pipeline (3) is connected puts in the described backwash inlet pipeline (2);
Described pulse valve (4) is the jet ash pulse valve that blows;
The pulse valve opening time is the 30-100 millisecond; It starts frequency is 1-3 time/second.
2. the film cleaning device in a kind of membrane separation technique according to claim 1 is characterized in that: the described pulse valve opening time is 50 milliseconds, and it is 2 times/second that described pulse valve starts frequency.
3. the film cleaning device in a kind of membrane separation technique according to claim 1 is characterized in that:
Described pulse of air pipeline (3) puts in backwash inlet pipeline (2) by groove pipe (7);
Stretch into backwash inlet pipeline (2) at pulse of air pipeline (3) and locate to be provided with a contraction section (8) and a diffuser (9) that produces Venturi effect; Described groove pipe (7) is inserted in the backwash inlet pipeline (2) that puts in contraction section (8) and place, diffuser (9) centre position.
4. the film cleaning device in a kind of membrane separation technique according to claim 3 is characterized in that:
The described pulse valve opening time is 50 milliseconds, and it is 2 times/second that described pulse valve starts frequency;
Described film cleaning device includes air purifier (6), inserts air purifier (6) between described pulse valve (4) and air compressor (5).
5. according to the film cleaning method of using in the described film cleaning device of one of claim 1-4, it is characterized in that:
Comprise film filter (1), backwash inlet pipeline (2) and pulse of air pipeline (3) in the described method; Described film filter (1) is connected with backwash inlet pipeline (2), and pulse of air pipeline (3) is connected with this backwash inlet pipeline (2), and the current in the backwash inlet pipeline periodically mix compressed air;
Also include the pulse valve (4) and the air compressor (5) that can produce the impulse hunting air-flow in the described film cleaning method; Described pulse valve (4) directly with after pulse of air pipeline (3) is connected puts in the described backwash inlet pipeline (2); Described air compressor (5) is connected with pulse valve (4);
Described film cleaning method is, described air compressor (5) produces compressed gas periodically opens and closes pulse valve (4), produce periodic high voltage pulse air-flow, promptly the current in the backwash inlet pipeline (2) are provided a high voltage pulse air-flow, make backwash water become the pulse aerated flow film is carried out anti-cleaning operation by steadily even stream.
6. the film cleaning method of using in a kind of film cleaning device according to claim 5 is characterized in that:
In the described method, described pulse of air pipeline (3) puts in backwash inlet pipeline (2) by groove pipe (7); And go up at backwash inlet pipeline (2), stretch into contraction section (8) and the diffuser (9) that backwash inlet pipeline (2) locates to comprise a generation Venturi effect at pulse of air pipeline (3); Described groove pipe (7) is inserted in the backwash inlet pipeline (2) that puts in contraction section (8) and place, diffuser (9) centre position;
Described film cleaning method has been used the Venturi tube mixed method, after promptly air pulse enters in the water of contraction section (8), in diffuser (9) subsequently along with water flow velocity reduce progressively to be released into micro air bubble, form the aerated flow that mixes.
7. according to the application of the film cleaning device in the described a kind of membrane separation technique of one of claim 1-4, it is characterized in that:
Described film cleaning device can be applied to the processing of water injection in low-permeability oilfield water treatment and product purification.
CNB2005101031224A 2005-09-16 2005-09-16 Membrane cleaning device and method in membrane separating technology and its application Active CN100420509C (en)

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