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Rotating disc type dynamic membrane separating assembly

A technology of separation components and dynamic membranes, applied in semi-permeable membrane separation, membrane technology, chemical instruments and methods, etc., can solve the problem of affecting membrane permeation flux and mass transfer process, strict requirements for material and liquid pretreatment, and difficult flow paths. Cleaning and other issues to achieve the effect of extending the cleaning and maintenance cycle, reducing membrane pollution, and reducing requirements

Inactive Publication Date: 2015-09-23
徐永恒
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: the fluid flow path of the permeate edge is long and difficult to clean, the membrane must be weldable and bondable, and the pretreatment requirements for the feed liquid are strict
[0011] The above membrane separation modules will have membrane fouling and concentration polarization to varying degrees during the operation process, and have certain requirements on the feed concentration. The change of feed concentration has a great impact on the membrane separation system, and the The flow rate on the membrane surface has certain requirements. The rapid flow of the feed liquid on the membrane surface produces a better hydraulic shearing effect to reduce membrane fouling and concentration polarization, but too fast a feed liquid flow rate will produce a higher axis The pressure gradient along the membrane surface leads to uneven distribution of filtration pressure (TMP), which affects the permeation flux and mass transfer process of the membrane; and the high-speed tangential flow requires a high reflux ratio to achieve, and the reflux ratio is too high. As a result, the energy consumption of the feed pump is high, and the material heat is serious; therefore, how to reduce membrane fouling and delay the attenuation of membrane flux, so that the membrane separation system can continue to separate and extend the cleaning cycle, and reduce the calorific value and energy consumption ratio of membrane separation. , are the three main problems facing the development of membrane separation technology

Method used

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  • Rotating disc type dynamic membrane separating assembly
  • Rotating disc type dynamic membrane separating assembly
  • Rotating disc type dynamic membrane separating assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] as attached Figure 1 As shown, the rotating disc dynamic membrane separation module of the present invention includes a frame, a filter disc, a rotating hollow shaft, a motor, a bearing seat, a motor bottom plate, a rotating flow baffle, a dynamic sealing device, an outer cylinder, a cover plate, a rotary joint, etc. composition. The filter disc is installed in a closed cylinder, which has a feed port (material) and a discharge port (concentrate), a 0.08μm filter membrane is installed on the filter disc, and 5 The disc filter disc rotates at a certain speed, and the permeate is discharged from the rotating hollow shaft through the rotary joint. The material is commercially available soybeans. Soybeans are soaked for 17 hours and crushed with a special soymilk machine for restaurants, and filtered through a 100-mesh filter (the soymilk machine comes with it) to obtain the filtered raw material. The raw material obtained after filtration contains soybean starch, fiber...

Embodiment 2

[0048] The structure of the rotary disc dynamic membrane separation module is the same as that of Example 1, and a 0.1 μm microfiltration membrane is installed on the filter disc. The material is wine foot mud from a certain vat, which has a relatively large solid content and viscosity. The permeate is clear and meets the owner's requirements for finished wine. No pre-filtering. During the nearly 7 hours of membrane separation, the permeate flow rate was always kept near Q=X L / ㎡*h. The pressure in the experiment was provided by a centrifugal pump to circulate the material back. The experiment ended because the centrifugal pump was having a hard time pushing the material back through the cycle. The concentration at the end of the experiment was not measured due to limited experimental conditions. The maximum temperature of the material rises by 3°C. There is no difference in the data measured by the two sets of prototypes.

Embodiment 3

[0050] The structure of the rotary disc dynamic membrane separation module is the same as that of Example 1, and a 0.1 μm microfiltration membrane is installed on the filter disc. The material is river water (river water is extracted directly from a river). 0.1μm microfiltration membrane direct filtration. The permeate is very clear, and a bamboo basket is set at the water inlet of the centrifugal pump to block large particles without flocculants. During the nearly 6 hours of membrane separation, the flow rate of permeate was always kept near Q=X L / ㎡*h. The pressure in the experiment was provided by a centrifugal pump. There is no reflux of the material and no change in the temperature of the material. The concentrated water is retained by the microfiltration membrane and discharged directly. Only one set of prototypes was used in this experiment.

[0051] Through this experiment we can get the following conclusions:

[0052] 1. The experiments in the above examples show...

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Abstract

The invention relates to the technical field of filtering separation of membranes, in particular to a rotating disc type dynamic membrane separating assembly. The rotating disc type dynamic membrane separating assembly comprises a machine frame, an outer cylinder and a motor, wherein the outer cylinder is vertically arranged on a mounting plate, the lower port of the outer cylinder is connected with the mounting plate through sealing components, and a separation barrel is arranged in the outer cylinder; a dynamic sealing bearing is arranged on the mounting plate, a hollow shaft is arranged on the dynamic sealing bearing in a rotating manner, and a plurality of filtering discs are arranged in the separation barrel; a belt wheel is arranged on the hollow shaft under the dynamic sealing bearing, and the motor is arranged on the machine frame on one side of the outer cylinder and connected with the belt wheel in a transmission manner. According to the rotating disc type dynamic membrane separating assembly disclosed by the invention, organic filtering materials in various flux specifications can be mounted on the filtering discs, the filtering discs in flat design can improve the filling densities of the organic filtering materials, and hollow flow baffles in fluid flow passage design are arranged among the filtering discs, so that a good hydraulic shear effect and rotary currents are formed on the surfaces of the membranes of the filtering discs by the flow baffles, the membrane pollution can be reduced, the generation of the concentration polarization can be alleviated, the decay speed of membrane flux is lowered, and the cleaning and maintaining period is shortened.

Description

technical field [0001] The invention relates to the technical field of membrane filtration separation, in particular to a rotating disc dynamic membrane separation module. Background technique [0002] The core of membrane separation technology is to assemble various filter membranes in a certain way in order to realize the device for filtering and separating the components contained in the material. Membrane separation devices generally include membrane supports, separation membranes, connectors that assemble membrane supports in a certain order, flow channels related to material fluid distribution in membrane separation modules, and various seals and interfaces. In the development and design process of membrane separation device, several basic requirements need to be considered: uniform fluid distribution without dead angle; good mechanical stability, chemical stability and thermal stability; high packing density, low manufacturing cost, easy cleaning, pressure loss Small...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D63/16
Inventor 徐永恒
Owner 徐永恒
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