CN102600728B - X-spiral-flow wound membrane diversion screen - Google Patents
X-spiral-flow wound membrane diversion screen Download PDFInfo
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- CN102600728B CN102600728B CN201210095663.7A CN201210095663A CN102600728B CN 102600728 B CN102600728 B CN 102600728B CN 201210095663 A CN201210095663 A CN 201210095663A CN 102600728 B CN102600728 B CN 102600728B
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- flow
- runner
- water conservancy
- conservancy diversion
- rolled film
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Abstract
The invention discloses an X-spiral-flow wound membrane diversion screen, which consists of a plurality of layers of flow passages which are overlapped together. Each layer of flow passages consists of longitudinal ribs. The layers of flow passages are in parallel with each other. Adjacent layers of flow passages are staggered in an X shape, i.e. the longitudinal ribs of the adjacent layers are connected in an X staggered and overlapped way to facilitate conversion from laminar flow to turbulent flow and eliminate influence caused by concentration polarization. Since the X-spiral-flow wound membrane diversion screen consists of a plurality of layers of flow passages consisting of longitudinal ribs, transverse ribs are not used and the scheme is different from the existing schemes, not only can the area of contact with a membrane surface be reduced and the effective available area of a separation membrane be increased, but also a dead corner is not produced, the disturbance of the laminar flow can be facilitated to convert the laminar flow to the turbulent flow under the secondary flow facilitating effect of an X spiral flow, the driving force and the mass transfer effect of solute diffusion are enhanced and the mass transfer capacity of primary liquid is greatly improved. The efficiency of membrane separation is improved, the volumetric percolate flux of the separation membrane is improved, the deposition of pollutants is avoided and the defects of the existing technical scheme are avoided.
Description
Technical field
The present invention relates to membrane separation technique field, relate in particular to a kind of being for example applied to, in high-purity separate use (in food, medical treatment and pharmaceutical industries), environment protection sewage processing or desalinization industry, use through engineering approaches osmosis (for example: counter-infiltration, just permeate) to carry out the water conservancy diversion filter of the just infiltration of separation and Extraction operation, reverse osmosis membrane, NF membrane, milipore filter, microfiltration membranes, electrodialytic membranes, Pervaporation membrane, membrane bioreactor etc.
Background technology
At present, the structure of various spiral wound membrane is roughly the same, by the film bag of built-in porous flow-guiding screen and the water conservancy diversion filter of an interval guide functions, is stacked, and is wound on a hollow antipriming pipe---and on the product-collecting pipe of center, be then tightly connected and form.The water conservancy diversion filter that existing domestic and international spiral wound film element is used, commonly rhombus filter and rectangle filter, be all structurally by the thicker longitudinal rib along runner direction, and is laterally interposed in horizontal bar thinner in runner and forms, all runner tiling one decks, form water conservancy diversion filter.Coordinate rectangular guiding filter shown in Fig. 1, Fig. 2, a certain side that its horizontal bar 1 is all partial to longitudinal rib 2 intersects, and is all that horizontal bar 1 is the structure contacting with face 6.Charging stoste is along the direction that is parallel to center product-collecting pipe---membrane component axial flow, axial line 5 is the some aphylactic map projections on water conservancy diversion filter of spiral wound film element axis, axial line 5 is parallel to membrane component axis, is for the dummy line of water conservancy diversion filter structure is described.
For solving existing this class filter structure, in when operation, exist, the formation dead angle, position contact with face 6 in four jiaos, mesh, easily cause deposition dirty stifled, and because horizontal bar 1 and face 6 close contacts cause the problem of the actual usable floor area reduction of membrane component.In Chinese patent CN201906567U, provide a solution for this reason, as shown in Figure 3, by filter, by a plurality of horizontal bars and longitudinal rib, formed, horizontal bar 1 is folded between longitudinal rib 2, from deflection runner on one side, move on to longitudinal rib middle part instead, horizontal bar is not contacted with face up and down.Separately there is Chinese patent CN202151550U to contact with all providing respectively in Chinese patent CN202155150U by reducing face, increase radially flow, and broadening thickening runner alleviates the technical scheme of four jiaos of easy pollution deposits of mesh.US Patent No. 3962096A has provided a kind of corrugated ripple water conservancy diversion filter design, expands runner, reduces the contact stain of filter and face, is convenient to clean and maintenance.
But existing water conservancy diversion filter product all exists a problem, be exactly in film separation process, effectively to eliminate or to reduce concentration polarization phenomenon.
Concentration polarization phenomenon be a kind of in film separation process ubiquity, need again the problem of solution badly.Due to the selection permeability of film, the solvent in stoste sees through film and arrives low-pressure side from high-pressure side, and most of solute is accumulated on surface, film high-pressure side by obstruction.Because " the gathering inspissation " of solute causes by film surface to the concentration gradient main body solution, cause that the diffusion that solute carries out solute by boundary layer to main body solution from film surface transmits.When the diffusion of this solute, transmit flux and flow flux while reaching transfer spreading balance along with seeing through the solvent of film and arrive the solute main body on film surface, with regard to deserving to be called the no longer process of time to time change of stating, having reached standing state, i.e. stable state.
Under stable situation, when solvent flows to face, when the flowing velocity of the solute causing and concentration gradient cause solute to reach balance from the speed of film agent-oriention solution diffusion, by forming at film near surface, a thin layer that solute concentration is high, velocity gradient is very large---concentration polarization boundary layer, this phenomenon is concentration polarization.In order to distinguish boundary layer and the potential barrier layer of laminar flow, then people propose boundary layer thickness (
) concept, boundary layer thickness can directly affect the diffusion of solute, and then affect the degree of concentration polarization.
Concentration polarization phenomenon in film separation process can be brought following harmful effect:
The first, the rising of film surface osmotic pressure will cause the decline of product liquid (solvent) flux;
The second, the Solute flux by film rises;
Three, solute, because the concentration on film surface surpasses its solubility product, precipitates and stops up fenestra and form, and reduces product liquid (solvent) flux, can cause the change of membrane separating property when serious;
Four, the appearance that film pollutes, when particularly film is seriously polluted, no better than formed again one deck secondary film on film surface, certainly will cause declining to a great extent of membrane separating property, disappears even completely.
Because belonging to invertibity, concentration polarization pollutes, can be by improving the reverse mass tranfer coefficient of solute, and reduce concentration polarization boundary layer thickness and eliminate or alleviate polarization.Mass tranfer coefficient is a proportionality coefficient in mass transport process equation, with mass transfer rate (G), is directly proportional as foundation to mass transfer area (F) and mass transfer force (△ is equal), and mass transfer area is phase border contact area.Motive force can adopt the mean value of the poor or pressure differential of various variable concentrations, i.e. G=
kf △ is equal, wherein (
k) be the mass tranfer coefficient in face concentration polarization boundary layer.
By changing the hydrodynamics condition on film surface, can reduce concentration polarization boundary layer thickness, improve the mass tranfer coefficient in boundary layer, and then reduce concentration polarization, alleviate film and pollute, in membrane separation technique, be called change fluidised form and eliminate concentration polarization.Shown in Fig. 4, the concentration polarization schematic diagram of film near surface while being stable state.Mass tranfer coefficient be (
k) be defined as solute diffusion coefficient (
d) and boundary layer thickness (
) ratio,
k=
d/
.
The square root of the diffusion coefficient of solute in water and the molecular weight relation that is inversely proportional to, molecular weight is larger, and the diffusion coefficient of solute is less, and mass tranfer coefficient reduces with the decline of solute diffusion coefficient, thereby volume permeation flux improves the impact of face solute concentration.Face solute concentration is to raise along with the increase of volume permeation flux, and in the situation that volume permeation flux is identical, the diffusion coefficient of solute is less, and the ratio of face solute concentration and material liquid solute concentration is larger.For different fluid separation applications membrane process concentration polarizations, there is corresponding relation with permeation flux, as just infiltration, counter-infiltration, nanofiltration, ultrafiltration, micro-filtration, electrodialytic membranes, Pervaporation membrane, membrane bioreactor etc., difference according to the molecular cut off of film and to some extent.
Because concentration polarization is the main cause that causes film to pollute, so the molecular cut off of diffusion barrier is larger, and volume permeation flux is higher, and film surface pollution is more serious.For the solute system of macromolecule, as in ultrafiltration and microfiltration membranes separation process, because the diffusion coefficient of solute in material liquid is little, so concentration polarization phenomenon can be very serious.In the situation that flow process is certain, polarization can become large because flow velocity reduces, and when flowing in stagnant area, degree of polarization can be maximum, when transition region, takes second place, and during turbulent area, polarization is minimum.The diffusion coefficient that improves solute just needs promoting layer circulation to become turbulent flow, in theory when tangential flow velocity will form turbulent flow over after critical, but the size of the tangential flow velocity of face is by stoste supply flow rate, membrane component, the factors such as width and thickness of water conservancy diversion filter runner determine, due to stream quantitative limitation, the Reynolds number of existing water conservancy diversion filter is all 100 left and right, this numerical value makes filter current completely within the scope of the laminar flow in Reynolds number 0～2000, generally there will not be eddy current or turbulent flow, so, merely by further improving the tangential flow velocity of film table, can not play the effect of obvious reduction concentration polarization, thereby need certain methods, as accelerated the mass transport process on film surface by changing fluidised form.
Summary of the invention
In order to overcome existing water conservancy diversion filter in actual applications, can not effectively pass through turbulization, improve solute diffusion coefficient, eliminate the deficiency of concentration polarization, the invention provides a kind of X eddy flow rolled film water conservancy diversion filter and application, the present invention is mutually the staggered water conservancy diversion filter structural design of X by multi-layer flow channels, and the conversion between guiding laminar flow and two kinds of different fluidised forms of turbulent flow promotes laminar flow because cross-flow disturbance changes turbulent flow into.
The object of the invention is to be achieved through the following technical solutions: a kind of X eddy flow rolled film water conservancy diversion filter, it is characterized in that, it is comprised of some laminar flows road, and every laminar flow road is comprised of some the longitudinal ribs that are parallel to each other, the angle of the axial line of longitudinal rib and X eddy flow rolled film water conservancy diversion filter
all be greater than
and be less than
, between the longitudinal rib of adjacent layer runner, be mutually angle
, be X staggered,
be greater than
and be less than
, described axial line is the projection on water conservancy diversion filter of the axis of rolled film, axial line is parallel to the axis of rolled film.
Further, between the longitudinal rib of described adjacent layer runner, be mutually the staggered superimposed connection of X.The entrance and exit of described rolled film X eddy flow water conservancy diversion filter can be at same layer runner, also can be at different runners.Fluid has the two classes designs routing mode that flows along runner, and a kind of is to flow into from this laminar flow road entrance, flows out to this laminar flow road terminal; Another kind is to flow into from this laminar flow road entrance, to the filter mesh of this laminar flow road terminal and adjacent layer runner intersection, flows into adjacent layer runner, then flows out from adjacent layer runner terminal.It is staggered that adjacent layer runner is mutually X, the filter mesh place crossing between adjacent layer runner, and fluid becomes whirlpool in the mutual disturbance of contact-making surface.
Because being superimposed with each other, water conservancy diversion filter and film bag be wound on the product-collecting pipe of center, be the oblique staggered two-layer or multi-layer flow channels of X by around center product-collecting pipe twist up, when charging stoste enters after water conservancy diversion filter, from membrane component axle center away from, the stoste in outer side runner is around screw winding face helical flow.It should be noted that, by Fluid Mechanics Computation (CFD) model analysis, fluid is under the effect of cross force, and the internal fluid advancing along spiral runner can produce Dien (Dean) eddy current.The circulation of eddy current energy promoting layer becomes turbulent flow, turbulent flow is that the fluid of being everlasting flows through the surface of solids, or a kind of irregular situation occurring in the laminar flow of same fluid, utilize momentum horizontal proliferation and the transmission characteristic of turbulent flow, with the concentration polarization and the film that greatly improve mixing efficiency and reduce in film separation process, pollute.
The invention has the beneficial effects as follows, the runner that X eddy flow rolled film water conservancy diversion filter of the present invention consists of multilayer longitudinal rib forms, there is no horizontal bar, this is different from existing various scheme, has so both reduced and the contacting of face, increased effective usable floor area of diffusion barrier, can not produce dead angle again, can also pass through the short Secondary Flow effect of X eddy flow, promoting layer flow disturbance changes turbulent flow into simultaneously, motive force and the mass transfer effect of having strengthened solute diffusion, strengthen stoste mass transfer ability greatly.Improve the efficiency of film separation, improve diffusion barrier volume permeation flux, prevent the deposition of pollutant, avoid the defect of prior art scheme.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described:
Fig. 1 is existing filter front view;
Fig. 2 is Fig. 1 structure cutaway view;
Fig. 3 is the cutaway view of Chinese patent CN201906567 U scheme;
Fig. 4 is the concentration polarization phenomenon schematic diagram of film near surface concentration;
Fig. 5 is X eddy flow rolled membrane screen front view;
Fig. 6 is Fig. 5 cutaway view;
Fig. 7 is Fig. 5 sectional view;
Fig. 8 is upper strata runner cutaway view;
Fig. 9 is Fig. 1 along flow passage direction muscle angle schematic diagram in length and breadth;
In figure, horizontal bar 1, longitudinal rib 2, runner 3, stoste stream 4, axial line 5, film 6, lower floor's longitudinal rib 7, upper strata longitudinal rib 8, lower floor's runner 9, upper strata runner 10, upper strata runner stoste stream 11, lower floor's runner stoste stream 12.
The specific embodiment
By reference to the accompanying drawings embodiment is described further, as shown in Figures 5 to 9, X eddy flow rolled film water conservancy diversion filter of the present invention is comprised of lower floor's runner 9 and upper strata runner 10, upper strata runner 10 is comprised of many upper strata longitudinal ribs 8 that are parallel to each other, and lower floor's runner 9 is comprised of many lower floor's longitudinal ribs 7 that are parallel to each other.In runner, the flow direction of stoste has formed the direction vector of runner, and axial line 5 is the projections on water conservancy diversion filter of rolled film axis, and axial line 5 is parallel to rolled film axis, is for the dummy line of water conservancy diversion filter structure is described.The angle of lower floor's longitudinal rib 7, upper strata longitudinal rib 8 and axial line 5
all be greater than
and be less than
, between lower floor's longitudinal rib 7 and upper strata longitudinal rib 8, be mutually angle
, be X staggered,
be greater than
and be less than or equal to
.Between lower floor's longitudinal rib 7 and upper strata longitudinal rib 8, can fix by modes such as welding, one casting, bonding, riveted joints.
Water conservancy diversion filter has tiling and reels two states is installed.
When water conservancy diversion filter is when tiling, can see by the neighbouring two-layer X of being mutually and interlocking, and streamwise is mutually angle
longitudinal runner form, in runner, there is no horizontal bar.Length according to module element in enforcement is selected
span, recommend 90
o, 60
otwo angles.Every layer of some runner that is parallel to each other consisting of some the lower floor's longitudinal ribs 7 that are parallel to each other and upper strata longitudinal rib 8 are formed, and each laminar flow road is interlaced.Too generous runner at flow one regularly, can reduce flow velocity, therefore selects longitudinal rib diameter 0.35mm, the interval 2mm of two adjacent parallel longitudinal ribs of same layer.
Charging stoste in each runner is at the mesh place that crosses of adjacent two layers runner, and interlaced disturbance, forms horizontal eddy current, makes the stoste in runner present the fluidised form of advancing around runner axis spiral.In the water conservancy diversion filter of adjacent two layers runner, stoste flow path is changeable, especially three layers and with the filter of upper runner in more intricate, design path is broadly divided into two classes:
The first kind, is to flow into from this laminar flow road entrance, flows out to this laminar flow road terminal;
Equations of The Second Kind, is to flow into from this laminar flow road entrance, to the filter mesh of this laminar flow road terminal and adjacent layer runner intersection, flows into adjacent layer runner, then flows out from adjacent bed runner terminal.
As shown in Figure 6, Figure 7, be respectively the cross sectional view along levels longitudinal rib direction.In shown in Fig. 6,12 is to see lower floor runner stoste stream view from afterbody, 11 is to see upper stream road stoste stream view from afterbody in shown in Fig. 7, the mutual cross-flow of fluid of adjacent two layers runner, and disturbance becomes whirlpool, forms Secondary Flow.Shown in Fig. 8, be upper strata runner cutaway view, in figure, 12 is to see from the head lower floor's runner stoste stream view, and the liquid in adjacent two layers runner flows mutual cross-flow, and disturbance becomes whirlpool, and each runner all can form Secondary Flow.If by existing filter product structure, by improving tangential velocity, can not form such effect merely.
The perturbation action of eddy current significantly improves the mass tranfer coefficient of face solute, has strengthened the interfacial mass transfer effect in film separation process.Meanwhile, in the oblique adjacent two layers runner mesh intersection intermeshing of X, the mutual disturbance on contact-making surface of the stoste in two runners becomes whirlpool, forms the limit Secondary Flow that mobile limit rotates around runner axial line forward.In stoste, with solvent, arrive the solute of face, the turbulent flow and the whirlpool that by the various points that superpose, are confluxed, put the formation such as eddy current near face are taken away, by continuous disturbance between fluid, stir, reach the thickness of attenuate concentration polarization boundary layer, improve diffusion coefficient, strengthen the migration of solute, solute is left in the main body stoste that film surf zone turns back to cross-flow.By being optimized design to improving to flow with mass transfer implementation procedure, can obviously suppress to occur that concentration polarization phenomenon and film pollute near face, strengthen the separating property of film, improve diffusion barrier volume permeation flux.
When water conservancy diversion filter is reeled while installing, the upper and lower two-layer X that is mutually is staggered, and streamwise is mutually angle
longitudinal runner, just become the spiral flow channel that the two-layer hand of spiral is contrary.Fluid in runner, when along runner helical flow, can produce Dien (Dean) eddy current, and the two-layer runner that the is mutually backpitch mesh place that crosses, cross-flow mutually between upper and lower liquid stream, disturbance mass transfer, plays raising diffusion coefficient, increases the effect of mass transfer ability.
Each laminar flow road of water conservancy diversion filter of the present invention forms by longitudinal rib parallel to each other, there is no horizontal bar, has both reduced and the contacting of face, and has increased the effective area of film separation, can not produce dead angle again simultaneously.
The technical program is compared with existing spiral wound membrane charging stoste water conservancy diversion filter, has the effect of obvious elimination or reduction face concentration polarization and film surface pollution, saves power consumption, and obviously improves separative efficiency and volume permeation flux.In the separated application of the films such as the technical program can be used for just permeating, counter-infiltration, nanofiltration, ultrafiltration, micro-filtration, electrodialysis, infiltration gasification, membrane bioreactor.
It should be noted that, in this embodiment, X eddy flow rolled film water conservancy diversion filter is comprised of upper and lower two-layer runner, and still, in actual production, according to the requirement of specific product design, X eddy flow rolled film water conservancy diversion filter of the present invention can be comprised of some laminar flows road.Above-described embodiment is just used for the present invention that explains, rather than limits the invention, and in the protection domain of spirit of the present invention and claim, any modification and change that the present invention is made, all fall into protection scope of the present invention.
Claims (5)
1. an X eddy flow rolled film water conservancy diversion filter, is characterized in that, it is comprised of some laminar flows road, and every laminar flow road is comprised of some the longitudinal ribs that are parallel to each other, the angle of the axial line of longitudinal rib and X eddy flow rolled film water conservancy diversion filter
all be greater than
and be less than
, between the longitudinal rib of adjacent layer runner, be mutually angle
, be X staggered,
be greater than
and be less than
, described axial line is the projection on water conservancy diversion filter of the axis of rolled film, axial line is parallel to the axis of rolled film.
2. rolled film X eddy flow water conservancy diversion filter according to claim 1, is characterized in that, is mutually the staggered superimposed connection of X between described adjacent layer runner longitudinal rib.
3. rolled film X eddy flow water conservancy diversion filter according to claim 1, is characterized in that, the entrance and exit of described rolled film X eddy flow water conservancy diversion filter is at same layer runner or at different runners.
4. rolled film X eddy flow water conservancy diversion filter according to claim 3, is characterized in that, fluid has the two classes designs routing mode that flows along runner, and a kind of is to flow into from this laminar flow road entrance, flows out to this laminar flow road terminal; Another kind is to flow into from this laminar flow road entrance, to the filter mesh of this laminar flow road terminal and adjacent layer runner intersection, flows into adjacent layer runner, then flows out from adjacent bed runner terminal.
5. rolled film X eddy flow water conservancy diversion filter according to claim 1, is characterized in that, it is staggered that adjacent layer runner is mutually X, the filter mesh place crossing between adjacent layer runner, and fluid becomes whirlpool in the mutual disturbance of contact-making surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210095663.7A CN102600728B (en) | 2012-04-01 | 2012-04-01 | X-spiral-flow wound membrane diversion screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210095663.7A CN102600728B (en) | 2012-04-01 | 2012-04-01 | X-spiral-flow wound membrane diversion screen |
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| Publication Number | Publication Date |
|---|---|
| CN102600728A CN102600728A (en) | 2012-07-25 |
| CN102600728B true CN102600728B (en) | 2014-03-26 |
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|---|---|---|---|---|
| CN105435641A (en) * | 2016-01-06 | 2016-03-30 | 大连理工大学 | Forward permeable membrane cross-flow filtration device for retarding concentration polarization and membrane pollution through folded plate vortex increasing |
| KR102166477B1 (en) * | 2017-11-03 | 2020-10-16 | 주식회사 엘지화학 | Apparatus and method for manufacturing helical strand of water-treatment filter module |
| CN108993166B (en) * | 2018-08-14 | 2023-11-21 | 三达膜科技（厦门）有限公司 | Anti-pollution formula roll-type membrane water conservancy diversion separates net |
| CN111992053B (en) * | 2020-08-17 | 2023-05-02 | 杭州科百特科技有限公司 | Gas exchange membrane, preparation method thereof and gas exchange assembly |
| CN112007519B (en) * | 2020-08-17 | 2023-05-02 | 杭州科百特科技有限公司 | Oxygenation membrane, preparation method thereof and oxygenation assembly |
| CN113262392B (en) * | 2021-04-25 | 2022-08-09 | 泰尔茂医疗产品(杭州)有限公司 | Connector with a locking member |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100522325C (en) * | 2004-03-26 | 2009-08-05 | 日东电工株式会社 | Spiral type separation membrane element |
| CN201906567U (en) * | 2010-12-15 | 2011-07-27 | 厦门征成膜清洗科技有限公司 | Rolled membrane screen structure |
| CN202538650U (en) * | 2012-04-01 | 2012-11-21 | 王旭东 | X rotational flow coiled film diversion filter |
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