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Device and method for separating films by using Karman vortex street principle

A Karman vortex street and membrane separation technology, which is applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of low separation efficiency and easy pollution, reduce concentration time, increase service life, and improve concentration efficiency effect

Inactive Publication Date: 2012-01-25
NANJING UNIVERSITY OF TRADITIONAL CHINESE MEDICINE
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved: the present invention aims at the problems of easy pollution and low separation efficiency in the membrane separation process, and proposes a method of using the vortex generated by the Karman vortex street to continuously scour the membrane surface, thereby reducing membrane fouling, increasing membrane flux, and further Apparatus and method for realizing fast and efficient separation

Method used

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  • Device and method for separating films by using Karman vortex street principle
  • Device and method for separating films by using Karman vortex street principle
  • Device and method for separating films by using Karman vortex street principle

Examples

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Embodiment 1

[0034] use figure 2 The shown flat-plate cross-flow membrane separation device with Karman vortex street is equipped with a flat-plate separation membrane 1 (effective membrane area 40cm 2 ), the separation membrane is a PES polyethersulfone ultrafiltration membrane with a molecular weight cut-off (MWCO) of 50kDa (Shanghai Snap Membrane Separation Technology Co., Ltd.), and a stainless steel Karman vortex generator is installed at the inlet of the membrane separation module.

[0035] The water extract of Huanglian Jiedu Decoction with a fixed volume (2L) is delivered to the membrane separation module through the feed pump. The length along the direction of fluid movement is d=0.1m. After measurement, the viscosity of the water extract of Huanglian Jiedu Decoction is θ=20.14×10 -6 m 2 / s. As verified by the previous formula, the Karman vortex street phenomenon will be generated under this condition. The raw material liquid cross-flows through the membrane module and return...

Embodiment 2

[0038] use image 3 The shown tubular cross-flow membrane separation device with Karman vortex street is installed with tubular separation membrane 1 (effective membrane area 50cm 2 ), the separation membrane uses zirconia with a pore size of 0.2 μm (produced by Jiangsu Jiuwu High-Tech Co., Ltd.), and a stainless steel Karman vortex generator is installed at the inlet end of the membrane separation module.

[0039]The fixed volume (5L) of Huanglianjiedu decoction Chinese medicinal water extract is transported to the membrane separation module through the feed pump. The length along the direction of fluid movement is d=0.2m. After measurement, the viscosity of the water extract of Huanglian Jiedu Decoction is θ=20.14×10 -6 m 2 / s. As verified by the previous formula, the Karman vortex street phenomenon will be generated under this condition. The raw material liquid cross-flows through the membrane module and returns to the feed system for recycling; the permeate that passes...

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Abstract

The invention discloses a device for separating a film by using the Karman vortex street principle. The device is characterized by comprising a film separating chamber, wherein the fluid inlet of the film separating chamber is provided with a Karman vortex street generating device. Re=Vd / theta, wherein V refers to the flowing speed of a fluid, d refers to the length of the film separating chamber along the moving direction of the fluid, theta refers to the kinematic viscosity coefficient of the fluid, and Re is more than 47 and less than 107. In the method, by using a fluid mechanics technology, the Karman vortex street is introduced into the design of a film assembly for the first time. Compared with the conventional film separating process, the method has the advantages: the separating time can be reduced greatly, the separating efficiency is increased, and the energy consumption is lowered. Compared with the conventional film separating assembly, the film separating device has the advantages: the film pollution in the film separating process can be lowered remarkably, and the service life of the film is prolonged.

Description

technical field [0001] The invention belongs to the technical field of membrane separation equipment, and relates to a device and method for using "Karman vortex street" to improve the motion state of fluid in the membrane separation process, increase the flux of the separation process, reduce membrane pollution, and quickly realize high-efficiency separation. Background technique [0002] Membrane separation technology is a new type of separation technology developed in the middle of the 20th century. Due to its simple equipment, convenient operation, high separation efficiency, low temperature (around room temperature), low energy consumption, and environmental protection, it has gradually become one of the irreplaceable unit operations. . Different from the existing equilibrium separation process, the membrane separation technology uses a selectively permeable membrane as the separation medium. Under the action of the driving force (such as pressure difference, concentrat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/00
Inventor 李博郭立玮付廷明
Owner NANJING UNIVERSITY OF TRADITIONAL CHINESE MEDICINE