CN2191031Y - Film separating assembly - Google Patents

Abstract

The utility model provides an assembly suitable for the hollow fibre and the external press tube type film. The film separating assembly forms a cuboid shape. The flow direction of the feed liquid is perpendicular to a film tube in axial direction, and the flow passage area is reduced. The flow speed of the feed liquid is increased under the condition that the pump discharge is unchanging. The utility model promotes the torrential flow using the file tube. So the flow condition of the feed liquid is improved; the phenomenon of concentration polarization and deposition gelatin is lightened; the separation performance of the film separating assembly is raised; the recovery rate of the film separating assembly is raised under the condition that the flow speed is the same. The film separating assembly with the external press tube is most suitable for dealing with the feed liquid with higher turbidity and viscosity and the occasions requiring big recovery rate and high cycles of concentration. The utility model has the advantages of big loading density, easy installation and easy exchanging film.

Description

Film separating assembly

The invention relates to a kind of invention of membrane module in the membrane separation technique.

Membrane separation technique is an emerging new and high technology.Comprise: counter-infiltration, ultrafiltration, micro-filtration, gas separation etc. have been applied to every field.At present, the principal mode of membrane module has: rolling, plate and frame, doughnut and tubular type.Wherein tubular type is divided into inside and outside pressure-pipe type, bushing type and inside and outside pressure bundled tube again.Various components ubiquity at work concentration polarization and surface deposition gelatin phenomenon, thereby has reduced the separating property and the service life of film.The flow regime that changes feed liquid can alleviate concentration polarization and surface deposition gelatin phenomenon, and wherein the method for most convenient is to improve flow velocity.Improving flow velocity concerning a certain assembly is exactly the flow that increases pump, thereby equipment investment is increased, and the assembly rate of recovery reduces, energy consumption strengthens.Be illustrated in figure 1 as the structure chart of doughnut and external pressure bundled tube assembly, 1 package shell, 2 film cores, 3 central tubes, the casting of 4 epoxies, 5 feed liquids inlet, 6 concentrated solution outlets, the outlet of 7 desalination solution.

The object of the present invention is to provide a kind of new assembly that is suitable for doughnut and external pressure tubular membrane, make that it has again when having big loading density that flow area is little, materials flow is evenly distributed, flow regime good, concentration polarization and the surface deposition gelatin phenomenon is light, the rate of recovery is big characteristics.

The present invention realizes like this.Assembly is a cuboid, and the film pipe is arranged along the length component direction, and the import and export of feed liquid is respectively at the two ends of cuboid, and the flow direction of feed liquid and film tubular axis are to vertical.Be illustrated in figure 2 as the assembly assumption diagram master, bow and analyse and observe, 1 package shell, 2 film cores, the casting of 4,12 epoxies, 7 desalination liquid chamber outlets, 5 feed liquids inlet, 6 material liquid outlets, 14,13 are imported and exported feed liquid distribution grid, 8 flanges, 9 seal washers, 10,11 resilient protection bodies.Feed liquid 5 is entered by inlet during work, and is uniform after face is flow through in intermembranous gap through distribution grid 7, and its direction of advance and film tubular axis are to vertical.Feed liquid after concentrating is discharged by outlet distribution grid and outlet 6 again.Desalination solution after film is handled imports the desalination liquid chamber by centre bore and is discharged by outlet 4.The length of cuboid is L, W, H, usually L＞H＞W.More even for materials flow is distributed, import and export can be taked taper or arc transition, and import and export also can be located at the bottom at two ends.(being that membrane area is identical) compared with assembly shown in Figure 1 under the identical situation of volume, and the flow area of assembly of the present invention reduces (referring to data behind the embodiment) greatly, and materials flow distributes more even, the accumulation of film and the easier control of arrangement.In assembly since the direction of advance of materials flow and film tubular axis to vertical, the direction of materials flow constantly change between pipe under the effect of film pipe, the film pipe plays the turbulent flow facilitation.Feed liquid can form turbulence state under low flow velocity.Take equilateral triangle to arrange along length component direction (materials flow direction) film Guan Yinying when the film pipe is the external pressure tubular membrane, this moment, the turbulent flow facilitation effect and the materials flow of film pipe distributed best.The film core of assembly can be divided into several sections, and the one, be convenient to make, can reduce the scrappage when changing film besides.Bigger as used film pipe diameter, the film core also can be cast and directly be assembled with screw thread, and it is more convenient to change film like this, and expense is lower.When handling the feed liquid of higher turbidity or viscosity, assembly should be selected tubular membrane for use and make has suitable gap in order to avoid stop up runner between pipe.One deck resilient protection body is arranged on both sides and bottom interior wall, play diaphragm and prevent runner short circuit effect.The doughnut that assembly is used and its manufacturing technology of external pressure tubular membrane are prior art.Assembly of the present invention can be made various specification, selects for use or makes up according to actual conditions such as feed liquid character, production capacity, rate of recovery etc.

The embodiment of the invention is as follows:

Be illustrated in figure 3 as embodiment modular construction master, the cutaway view of bowing, its each several part title is same as shown in Figure 2, the inner cavity size of assembly is 800 * 200 * 500 to select different materials for use and satisfy different requirement of strength according to the different package shells of purposes.The resilient protection body is a foamed plastics, is bonded on the inwall.Film is selected the external pressure tubular membrane of band supporter for use, external diameter φ 3, and internal diameter φ 1 is cast into three elements.At first the film pipe is arranged boundling, end casting sealing, other end casting back is cut and is exposed centre bore, sticks to one and proof strength and sealing with diluting compartment again.Cast and adjust intermembranous gap as required when bonding, and make it be equilateral triangle to arrange, the size of film core will match with shell.At last the film core is connected sealing by the flange on the diluting compartment with shell, the outlet of three desalination liquid chambers connects with pipeline.This moment, the membrane area of assembly can reach 58m ², loading density is 725m ²/ m ³

When the film effective length of assembly shown in Figure 1 is 1 meter, as to make its membrane area be 58m ², use with a kind of film filling, then this moment, the assembly internal diameter was 2 * (58/725 * π) ^1/2=32cm.As disregard the film pipe and occupy part, the average flow area of this assembly is π * 32 * 100/2=5024cm ², for 5024/20 * 50=5 of embodiment assembly doubly.As Fig. 1 assembly film effective length is 50cm, as calculated this moment this assembly average flow area be 3.5 times of embodiment assembly.When the effective length of Fig. 1 assembly is 50cm, as its average flow area is equated with embodiment, this moment, the internal diameter of assembly was 2 * 20/ π=12.7cm, and membrane area is π * 0.127 ²* 0.5 * 725/4=4.59m ², be 58m as membrane area ²Need 58/4.59=12.6 this assembly.Do not consider others, only 12.6 assemblies be together in series that its flow resistance is more much bigger than embodiment assembly.

To sum up the present invention that chats of institute is by changing modular construction, greatly reduce flow area, improved the uniformity that materials flow distributes, under the identical situation of flow, compared to Figure 1 can improve the flow velocity of feed liquid greatly, the turbulent flow facilitation is played in the arrangement that makes full use of the film pipe is further improved fluidised form, thereby alleviated the stain resistance that concentration polarization and surface deposition gelatin phenomenon have strengthened assembly, improved the separating property and the service life of assembly.The flow of pump can reduce greatly under the identical situation of crossflow velocity, and the rate of recovery increases.When assembly of the present invention uses the external pressure tubular membrane and makes it that certain clearance be arranged, can reduce requirement to pre-treatment, reduced equipment investment and running expense and operation easier, be suitable for handling the feed liquid of higher turbidity and viscosity most and require the rate of recovery big, the occasion that cycles of concentration is high.This assembly loading density is big, installs and changes film conveniently.

Claims (1)

1, a kind of membrane separation assemblies is applicable to doughnut and external pressure tubular membrane, it is characterized in that: assembly is a cuboid, and the charging and discharging mouth is at the two ends of cuboid, and the film pipe is arranged along the length component direction, and feed liquid flow direction and film tubular axis are to vertical.

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