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Rolled membrane static mixed flow screen

A roll-type membrane and screen separation technology, which is applied in the field of membrane separation, can solve the problems of increasing pressure drop and pump consumption, achieve the effects of reducing pressure drop and pump consumption, changing hydrodynamic conditions, and reducing vortex and turbulence

Active Publication Date: 2016-05-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005]However, the existing diversion screens effectively reduce concentration polarization and membrane fouling, improve mass transfer, and increase the pressure drop during membrane operation and pump consumption

Method used

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  • Rolled membrane static mixed flow screen
  • Rolled membrane static mixed flow screen
  • Rolled membrane static mixed flow screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Select a screen unit size as shown in the table:

[0032] A(mm) B / A C / A D / A E / A F / A 1 4 3 1 10 7

[0033] The size of 13 mesh units constitutes a mesh strip, and 13 mesh strips form a mesh. The mesh is installed on a polyethersulfone ultrafiltration membrane with a length of 19cm and a width of 14cm. Glycans (important raw materials in medicine, food, cosmetics and other industries) are tested as solutes. The test pressure is 120kPa, and the concentration of dextran is 5.0kg / m 3 , and compared with conventional grids. The experimental results show that in the membrane process under the same pump consumption, the static mixed flow partition has similar or higher mass transfer performance than the conventional partition, and in the membrane process under the lowest pump consumption, compared with the conventional partition Compared with that, the mass transfer coefficient increased by nearly 33% after adopting the static mixed flow sepa...

Embodiment 2

[0035] Select a screen unit size as shown in the table:

[0036] A(mm) B / A C / A D / A E / A F / A 1 5 2 1 12 5

[0037] The size of 13 mesh units constitutes a mesh strip, and 13 mesh strips form a mesh. The mesh is installed on a polyethersulfone ultrafiltration membrane with a length of 19cm and a width of 14cm. Glycans (important raw materials in medicine, food, cosmetics and other industries) are tested as solutes. The test pressure is 120kPa, and the concentration of dextran is 5.0kg / m 3 , and compared with conventional grids. The experimental results show that in the membrane process under the same pump consumption, the static mixed flow partition has similar or higher mass transfer performance than the conventional partition, and in the membrane process under the lowest pump consumption, compared with the conventional partition Compared with that, the mass transfer coefficient increased by nearly 46% after adopting the static mixed flow sepa...

Embodiment 3

[0039] Select a screen unit size as shown in the table:

[0040] A(mm) B / A C / A D / A E / A F / A 1 4 3 2 12 7

[0041] The size of 13 mesh units constitutes a mesh strip, and 13 mesh strips form a mesh. The mesh is installed on a polyethersulfone ultrafiltration membrane with a length of 19cm and a width of 14cm. Glycans (important raw materials in medicine, food, cosmetics and other industries) are tested as solutes. The test pressure is 120kPa, and the concentration of dextran is 5.0kg / m 3 , and compared with conventional grids. The experimental results show that in the membrane process under the same pump consumption, the static mixed flow partition has similar or higher mass transfer performance than the conventional partition, and in the membrane process under the lowest pump consumption, compared with the conventional partition Compared with that, the mass transfer coefficient increased by nearly 40% after adopting the static mixed flow sepa...

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Abstract

The invention discloses a spiral-wound membrane static-state mixed flow filtering net. The spiral-wound membrane static-state mixed flow filtering net is composed of a plurality of filtering net strips and is fixed by a filtering net frame, and the filtering net strips are uniformly distributed at the same distance in a feeding direction, each filtering net strip is composed of a plurality of filtering net units, each filtering net unit is provided with three fluid passages perpendicular to the feeding fluid direction, fluid is statically mixed in the filtering net unit, no vortex and turbulent flow are caused, and no fluid dead angle is generated when the fluid passes through the filtering net. According to the spiral-wound membrane static-state mixed flow filtering net, fluid near the surface of the membrane and at the center of the fluid passage is inter-migrated, the fluid mechanical condition of the surface of the membrane is changed, no vortex and turbulent flow are generated, the above technical scheme is different from the various existing schemes, the surface concentration of the substance intercepted by the membrane can be reduced, the mass transfer rate is increased, the fluid mixing effect is improved, while the concentration polarization and the membrane pollution can be effectively reduced, the increased pressure drop and the pumping loss during membrane operation due to the arrangement of the filtering net can be reduced, and the energy utilization rate is improved.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a roll-type membrane separation net, in particular to a roll-type membrane static mixed-flow separation net. Background technique [0002] Membrane separation technology has the advantages of simple equipment, convenient operation, no phase change, high processing efficiency and energy saving. As a unit operation, people pay more and more attention to it. It has been widely used in fields such as industry, environmental protection and bioengineering. However, in the process of use, one of the main problems is that the permeation flow decreases with the prolongation of the operation time. The influencing factors are as follows: ①Concentration polarization makes the solute on the membrane surface diffuse to the bulk solution, thereby forming resistance and reducing the permeation flow; ②The interaction between the separated solute and the membrane or the concentration on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D63/10
Inventor 刘久清
Owner CENT SOUTH UNIV
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