Double-layer asymmetrical surface film of porous ceramic filter tube for dust filter and preparation method thereof

A technology for porous ceramics and dust filtration, applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of reducing filtration pressure drop, reducing surface film thickness, etc. low cost effect

Active Publication Date: 2011-01-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This filter tube with a single-layer surface film has the problem that the surface film powder enters the pores of the support during the film-making process, so that the actual thickness of the surface film is greater than its nominal thickness. Therefore, it is necessary to f

Method used

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  • Double-layer asymmetrical surface film of porous ceramic filter tube for dust filter and preparation method thereof
  • Double-layer asymmetrical surface film of porous ceramic filter tube for dust filter and preparation method thereof
  • Double-layer asymmetrical surface film of porous ceramic filter tube for dust filter and preparation method thereof

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preparation example Construction

[0031] (1) First prepare the ceramic fiber slurry; add the ceramic fiber and dispersant to a certain solvent, heat the solvent and keep stirring the mixed solution until the ceramic fiber is evenly dispersed;

[0032] (2) The ceramic fiber slurry with good dispersibility prepared in step 1 is coated on the porous ceramic support by a suitable film-making method to form a ceramic fiber blank film with a complete surface and uniform film thickness of a certain thickness, and It is dried at a certain temperature;

[0033] (3) Prepare the slurry of the filter membrane; select ceramic powder and binder with a specific average particle size, disperse it in a specific solvent, and finally form a filter membrane slurry with well-dispersed solid particles and suitable viscosity;

[0034] (4) The slurry prepared in step 3 is formed on the ceramic fiber blank membrane with a suitable thickness and good integrity of the filter membrane blank membrane by a suitable membrane-making method, ...

Embodiment 1

[0047] First, add 2g of mullite fiber with a diameter distribution of 1μm to 500μm and an aspect ratio greater than 10 and 1.5g of sodium carboxymethylcellulose into a beaker, then add a sufficient amount of water, heat to boil and stir at the same time until the mullite The fibers are uniformly dispersed and the mullite fiber mass fraction reaches 5%, and the fiber film slurry is obtained. In addition, 9 g of silicon carbide powder with a particle size of 54 μm and 1 g of kaolin were magnetically stirred and mixed in 35 ml of deionized water to obtain filter membrane slurry.

[0048] The obtained mullite fiber slurry was cast on a silicon carbide support sheet to prepare a fiber blank film, and the fiber blank film was dried at 110°C. Then, a filter membrane is prepared on the mullite fiber blank membrane by casting method, which is also dried at 110°C. Finally, the porous ceramic with double-layer asymmetric surface membrane was sintered at 1280°C for 3h.

[0049] The prep...

Embodiment 2

[0052] First, add 1g of mullite fibers with a diameter distribution of 1 μm to 500 μm and an aspect ratio greater than 10, 1 g of aluminum silicate fibers with a diameter distribution of 1 μm to 500 μm and an aspect ratio greater than 10, and 2 g of polyvinyl alcohol into a beaker, and then add A sufficient amount of water is heated and boiled while stirring until the mullite fibers are uniformly dispersed and the mass fraction of the mullite fibers reaches 10%, to obtain a fiber film slurry. In addition, 9 g of mullite powder with a particle size of 20 μm and 1 g of kaolin were magnetically stirred and mixed in 35 ml of deionized water to obtain filter membrane slurry.

[0053] The prepared mixed slurry of mullite fiber and aluminum silicate fiber was cast on a silicon carbide support sheet to prepare a fiber blank film, and the fiber blank film was dried at 110°C. Then, a filter membrane is prepared on the mullite fiber blank membrane by casting method, which is also dried a...

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Abstract

The invention relates to a double-layer asymmetrical surface film of a porous ceramic filter tube for a dust filter and a preparation method thereof, belonging to the field of a porous ceramic filter tube manufacture technology. The double-layer asymmetrical surface film is characterized in that ceramic fibers are prepared into fiber film slurry; a ceramic fiber filter film of the set thickness is prepared on the surface of a support of the aperture larger than the particle size of surface film powder; and a filter film having the action of filtering is prepared on the surface of the ceramic fiber film after dried and sintered at high temperature. The prepared double-layer asymmetrical surface film has the advantages of more effective filter pressure drop reduction of the filter tube and longer service life prolongation compared with the traditional single-layer particle surface film.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic filter tube manufacturing, and in particular relates to a method for preparing a double-layer asymmetric surface membrane of a high-temperature filter porous ceramic filter tube. This double-layer asymmetric surface membrane is mainly used in the field of high-temperature gas filtration and dust removal. Background technique [0002] Traditional thermal power generation not only has low energy utilization efficiency, but also emits a large amount of dust, which is very serious to environmental pollution. Therefore, new thermal power generation systems with high energy utilization and almost no dust emissions, such as clean coal power generation systems such as integrated gasification combined cycle (IGCC) and pressurized fluidized bed combustion combined cycle (PFBC), are favored and have broad prospects . In these clean coal power generation systems, coal is gasified at high temperature ...

Claims

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Application Information

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IPC IPC(8): B01D71/02B01D67/00B01D69/12
Inventor 李建保李俊峰林红
Owner TSINGHUA UNIV
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