CN1465428A

CN1465428A - Application method for membrane

Info

Publication number: CN1465428A
Application number: CNA02124622XA
Authority: CN
Inventors: 杨时英; 杨蔡婷
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-06-20
Filing date: 2002-06-20
Publication date: 2004-01-07
Anticipated expiration: 2022-06-20
Also published as: CN100351005C

Abstract

The present invention discloses an application method of membrane. In the high-speed rotary membrane equipment it utilizes the pressure difference formed by different liquid levels in the centrifugal field and does not external pump, and can form permeable pressure of membrane and flowing force of filtrate, and under the action of centrifugal force it can make membrane surface retain clean, and can raise discharge concentration of trapped liquor.

Description

A kind of application process of film

The present invention relates to a kind of application technology of film.As a kind of separation, concentrate, the film of purification and process for purifying is applied in fields such as petrochemical industry, light industry, weaving, food, bioengineering, medicine, desalinization, environmental protection; but because the pollution problem in use of various films has limited film in wider use.So the concentration of emission of the control that film pollutes, the surplus liquid of raising filter just becomes the key technology in the film applied technical field.

For solving membrane pollution problem, all adopt the cross-flow technology as the main method of operation usually at present, adopt backwash intermittently or chemical cleaning method to recover the flux of film when seriously polluted.The feature of cross-flow technology is that a relative velocity is arranged between filtrate and the face, the shearing force removing that relies on liquid stream and face attached to face pollutant.Present known film using method all provides to see through with pump and presses and liquid supply rate, because the long-range what of filtrate throughput on the face sees through the clear liquid amount of film, in order to keep the certain operating pressure and the relative velocity of face, lot of energy consumes in the circulation of filtrate, because the dope in the cyclic process in the surplus liquid of filter can not effectively separate, repeat to participate in filtration, this concentration of emission that has just limited the surplus liquid of filter can't improve further.＜inoranic membrane technology and application thereof〉High-shear crossflow filtration described in the book p230, " its basic principle be with film (or near film surface) with respect to fluid motion to replace that the liquid pump is advanced fixing filter membrane runner, also can adopt making turning the film surface and produce the method for high-speed gradient in the fluid." wherein, " rotate in the liquid of film in entering static cover frame, filtrate is then extracted out by hollow rotating shaft "." has the axial filter that rotates filter membrane." similar a bit with present technique on these two kinds of mode images, but its essence still is that the pressure that produces with pump is filter pressure, the purpose of whirligig is only for obtaining the high shear rates of the relative face of filtrate.Therefore its housing must seal.Because this technology only reaches the removing of film surface deposits from the raising cross-flow velocity, the deposit that is eliminated is separated in the surplus liquid of filter with concentrate, thereby limited the raising of relief liquor concentration.

The purpose of this invention is to provide a kind of membrane filtering method of in centrifugal force field, working, it is on-stream not to rely on external pump and just can keep stable film to see through pressure, stable cross-flow velocity automatically, can also will filter heavy phase pollutant, dope and the light liquid layering that remains in the liquid in the centrifugal sedimentation mode.Make heavy phase pollutant, dope to the direction sedimentation of leaving the membrane filtration face, light liquid is at the machine internal circulation filtering.The cleaning that keeps face, the load that has alleviated filter membrane improves the concentration of emission that filter remains liquid.

The object of the present invention is achieved like this, and the film device of rotation drives the liquid at high speed rotation and formed centrifugal force field at a high speed, and the pressure differential that exists with filtrate face in the centrifugal force field and two different radii liquid level valves of clear liquid face is the pressure that sees through of film.In the filtrate and the face trapped substance in the heavy phase thing, under centrifugal action, to the direction sedimentation of leaving face.

In order to increase the filter area of film, film can also be made the membrane module of many filtration runners.The interior filtrate of centrifugal force field is divided into by membrane module treats filtrate and surplus liquid two parts of filter, it is characterized in that the surplus liquid of the filter of passing through in the membrane module runner can also pass through air deflector, is guided to and treats filtrate side circulating filtration.The surplus liquid level of filter, and treat that the pressure differential of different radii liquid level between the filtrate face and centrifugal force are the power that filtrate is passed through the membrane module runner.Filtrate can be filtered in the cross-flow mode in runner.Membrane module can be by multiple modes of forming such as garden sheet film, tubular film, hollow-fibre membranes.

The film device of high speed rotation, drive the centrifugal force field that the liquid at high speed rotation forms, seeing through pressure but also the mobilization force of filtrate in the membrane module runner being provided of film not only was provided, changed the film application mode of present known dependence pump, the settlement action of centrifugal force makes with the reciprocal face heavy phase of centrifugal force pollutant to break away from face, makes face keep good filter capacity, the sedimentation of heavy phase thing makes face only have comparatively clear light phase filtrate participation to filter again in the filtrate, has alleviated the load of film.

Accompanying drawing is the schematic diagram of film using method of the present invention, is further described below in conjunction with accompanying drawing: the film device of rotation is by main shaft 1 at a high speed, cylindrical shell 2, membrane module 3, clear liquid groove 6, clear liquid sucking pump 7, dense soiling solution groove 8, dense soiling solution sucking pump 9, communicating pipe 10, air deflector 11 is formed.Membrane module 3 is made up of membrane component 4, clear liquid chamber 5, membrane module 3 with cylindrical shell 2 every being divided into two parts, membrane module 3 inboards for treating filtrate part 13, between membrane module 3 outsides and cylindrical shell 2 for the surplus liquid part 14 of filter, flow guiding disc 11 is arranged therebetween.The film device of rotation drive filtrate is rotated at a high speed and has been formed centrifugal force field at a high speed, and suspension enters the film device of rotation at a high speed by 12 places.Filtrate at first enters the surplus liquid part 14 of filter, through the relative more clear minor radius place filtrate of sedimentation separation, treat filtrate part 13 through air deflector 11 importings, again by membrane component 4, at clear liquid tank liquor face with under treating that pressure that filtrate part liquid level semidiameter forms promotes, on the face of membrane component 4, form infiltration, the clear liquid that sees through face collects in clear liquid part 15 places in the membrane module 3, by being passed to communicating pipe 10 in the clear liquid groove 6, discharge through clear liquid pipe 16 by 7 sucking-offs of clear liquid sucking pump again.The liquid level radius of the pressure control clear liquid groove 6 in the position of clear liquid sucking pump 7 and the clear liquid pipe 16.The promotion that the surplus liquid of filter, concentrate, the pollutant of being held back by face is subjected to centrifugal force and treats the filtrate position and filter pressure reduction between surplus liquid level, flow in surplus liquid part 14 places to filter.Wherein the concentrate of heavy phase and pollutant are subjected to centrifugal force to the barrel sedimentation.The surplus liquid of the filter of light phase then by the air deflector water conservancy diversion to treating that the filtrate side circulates.The concentrate of sedimentation and pollutant lead to dense soiling solution groove 8 is discharged through dense soiling solution comb 17 by dense soiling solution sucking pump 9 sucking-offs.Also can directly discharge by hole uniform on the barrel.

Effective face in the membrane module is to arrange to parallel direction on the contrary with centrifugal force, filtrate pressure difference and centrifugal force drive, by the filtrate channel of forming by face, on face, be the cross-flow shape, the clear liquid that wherein sees through face then by membrane module inside by being pooled to communicating pipe in the outer clear liquid groove of body end surface, aspirate out by centripetal discharge pump in the clear liquid groove or suction pipe again, the surplus liquid of filter then accumulates between membrane module and the housing, because of being subjected to the settlement action of centrifugal force, the concentrate in the surplus liquid of filter and the barrel side of contaminants long radius in cylindrical shell are discharged by dense soiling solution sucking pump, the light liquid that is in the minor radius place is then treated filtrate part circulating filtration by what flow guiding disc drained into the membrane module inboard, flow guiding disc has stator in being, section is the garden dish of U-shaped, also can be that many sections are the pipe of U-shaped.Static or and the membrane module differential rotation of its relative membrane module.Surplus liquid level of control flow guiding disc import filter and membrane module inboard are treated that the liquid level semidiameter of filtrate face can be controlled and are treated the pressure reduction of filtrate between the filtration channel entrance and exit, under the acting in conjunction of this pressure reduction and centrifugal force, filtrate with very little pressure drop relatively face form flow at high speed and make face be in the work of cross-flow shape.Because the pressure gap of different liquids is that difference by the liquid level position forms in the machine, as long as so reduce or stop feed flow, filtrate face liquid level is reduced to purified liquor outlet liquid level position and forms the filter membrane backwash when following.

The present invention's film using method can be used in the field in micro-filtration, ultrafiltration, counter-infiltration: the supply of filtrate only need stress-free from flow liquid just can, the recirculation of filtrate is finished by the flow guiding disc in the machine, has reduced energy loss.The surplus liquid of filter discharges dope respectively after separating through centrifugal sedimentation, and light liquid filters to the recirculation of filtrate entrance side through water conservancy diversion, has not only alleviated the filtration load of face but also improved the concentration of discharging dope greatly.

The present invention's film using method can concentrating, separating, pectin separation, concentration of juices, the application of fields such as Separation of Proteins and sewage disposal at dairy products.Can improve the concentration of concentrate, fall end power consumption, prolong the service life of film.In sewage disposal is used, since low to the preliminary treatment requirement, the concentration of emission height, extremely with practical value.

Claims

1. the application process of a film is characterized in that, the film device of rotation drives the liquid at high speed rotation and formed centrifugal force field at a high speed, is the pressure that sees through of film with the pressure differential that exists between filtrate face in the centrifugal force field and two different radii liquid levels of clear liquid face.In the filtrate and the face trapped substance in the heavy phase thing, under centrifugal action, to the direction sedimentation of leaving face.

2. according to claim 1, the filtrate in the centrifugal force field can also be divided into by membrane module treats filtrate and surplus liquid two parts of filter.It is characterized in that the surplus liquid of the filter of passing through can also be guided to by air deflector treats filtrate side circulating filtration in the membrane module runner.To filter surplus liquid level and to treat that the pressure differential of different radii liquid level between the filtrate face and centrifugal force are the power that filtrate is passed through the membrane module runner.