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Rolled membrane static mixed flow screen

A roll-type membrane and screen separation technology, 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, reducing membrane fouling, and changing hydrodynamic conditions

Active Publication Date: 2016-03-23
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
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  • 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 G / A 1 4 3 1 10 7 0.5

[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 36% after adopting the static mixe...

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 G / A 1 5 2 1 12 5 0.5

[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 50% after adopting the static mixe...

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 G / A 1 4 3 2 12 7 0.5

[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 47% after adopting the static mixe...

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Abstract

The invention discloses a static mixed flow separating screen for a spiral-wound membrane. The screen is composed of a plurality of separating screen strips which are fixed through a separating screen strip frame and uniformly distributed in the feeding direction at equal intervals. Each separating screen strip is composed of a plurality of separating screen units. Each separating screen unit is provided with three fluid channels perpendicular to the fluid inlet direction. Fluid carries out static flow mixing in the separating screen units and does not generate vortexes or turbulence, and fluid dead space does not exist when the fluid flows through the separating screen. According to the static mixed flow separating screen for the spiral-wound membrane, the fluid close to the surface of the membrane and the fluid in the centers of the fluid channels can be transferred mutually, the mechanical condition of the fluid on the surface of the membrane is changed, the vortexes and the turbulence are avoided, the separating screen is different from various existing schemes, the surface concentration of materials held back by the membrane is reduced, the mass transfer rate is increased, and fluid mixing is strengthened; moreover, pressure drop and pump consumption increased in the operating process of the membrane due to adding of the separating screen are reduced while concentration polarization and membrane pollution are effectively reduced, and the energy utilization ratio is increased.

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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