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Filtering method and filtering device with alternating electric field on filter element

A filter device and filter method technology, applied in the direction of filter separation, separation method, chemical instrument and method, etc., can solve the problems of filter and solution properties, unfavorable aggregation of small particles, charged particles, etc., to achieve increased filter effect and stability, The effect of increasing the chance of coagulation and improving stability

Active Publication Date: 2012-03-21
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this device can only repel various charged particles of different masses outside the filter element and distribute them in an irregular manner, which is not conducive to the aggregation of small charged particles; at the same time, some particles in the solution will be charged under low-voltage direct current conditions. resolved out, affecting filtration and solution properties

Method used

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  • Filtering method and filtering device with alternating electric field on filter element
  • Filtering method and filtering device with alternating electric field on filter element
  • Filtering method and filtering device with alternating electric field on filter element

Examples

Experimental program
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Effect test

Embodiment 1

[0025] The filter device used in high-temperature gas filtration uses FeAl intermetallic compound porous material as the filter element, the gas temperature is 200°C during filtration, and the filter pressure difference is 1kPa. A 50-volt voltage is applied between the filter element 3 and the shell 2 of the filter device. Alternating voltage, the alternating frequency is 15HZ, and the filtering result is significantly higher than the filtering stability when a 50V DC voltage is applied between the filter element 3 and the shell 2 . Reflected in Figure 4 Among them, in order to maintain the filtration flux constant, when the above-mentioned alternating voltage is applied between the filter element and the shell, the filtration pressure difference remains basically unchanged over time, or even slightly decreases (indicating that a large number of small particles of charged particles are agglomerated); while when After a DC voltage is applied between the filter element and the ...

Embodiment 2

[0027] The filter device used in high-temperature gas filtration uses FeAl intermetallic compound porous material as the filter element, the gas temperature is 200°C during filtration, and the filter pressure difference is 3kPa. A 50-volt voltage is applied between the filter element 3 and the shell 2 of the filter device. Alternating voltage, the alternating frequency is 45HZ, and the filtering result is obviously improved in filtering stability compared with the case of applying 50V DC voltage between the filter element 3 and the shell 2.

Embodiment 3

[0029] The filter device used in liquid filtration uses TiAl intermetallic compound porous material as the filter element, the membrane surface flow velocity is 4m / s during cross-flow filtration, and the filtration pressure difference is 30kPa. The alternating voltage is 10 volts, the alternating frequency is 45HZ, and the filtering result is obviously improved compared with the case of applying a 10 volt direct current voltage between the filter element 3 and the shell 2 .

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Abstract

The invention discloses a filtering method, which not only can prevent charged particles from polluting a filter element, but also can increase filtering stability. The method includes that alternating voltage of 10HZ to 50HZ is applied between the filter element and a shell of a filtering device when substances to be filtered realize gas-solid or liquid-solid separation via the filtering device. Under the action of the alternating electric field, the charged particles in the filtering device move repeatedly, as masses of the particles are different and flowing speeds of the particles under the action of the same force are different, the particles with different masses can be separated within a certain space, so that the particles with different masses are successively distributed between the filter element and the shell, and the integral filtering stability is increased. The invention further provides a filtering device comprising a shell and a filter element which are insulated from each other, and the shell and the filter element are respectively connected with two output poles of a power polarity converting circuit with the alternating frequency of 10HZ to 50HZ.

Description

technical field [0001] The present invention relates to filtration methods and devices. Background technique [0002] The applicant of the present application provides a filter device in the patent literature of CN101721848A, the basic concept of which is to apply a weak, constant DC voltage on the filter element, thereby repelling the same charge as the filter element in the solution to be filtered by Coulomb force. Particles, to prevent charged particles from adsorbing to the filter element. However, this device can only repel various charged particles of different masses outside the filter element and distribute them in an irregular manner, which is not conducive to the aggregation of small charged particles; at the same time, some particles in the solution will be charged under low-voltage direct current conditions. resolved, affecting filtration and solution properties. Contents of the invention [0003] The first technical problem to be solved by the present invent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D35/06B01D29/86B01D65/08
Inventor 高麟汪涛林勇
Owner CHENGDU INTERMENT TECH
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