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Preparation method of metal ceramic composite filtering element

A metal-ceramic composite and filter element technology, which is applied in the direction of filtration and separation, separation methods, chemical instruments and methods, etc., can solve the problems of low compressive strength, poor corrosion resistance, poor filtration accuracy, etc., and achieve fracture resistance, breathability and corrosion resistance Good performance and high precision

Active Publication Date: 2015-06-17
WESTERN BAODE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a metal-ceramic composite filter element, which solves the problems of poor corrosion resistance, poor filtration accuracy and low compressive strength of existing filter elements

Method used

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  • Preparation method of metal ceramic composite filtering element

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Experimental program
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Effect test

preparation example Construction

[0025] That is, the preparation of the metal-ceramic composite filter element is completed.

[0026] In step a, a spiral perforated tube 6 is installed on the side of the inner composite wire mesh 2 away from the annular space 3 . In step b, the vibration frequency is 1000Hz-1500Hz, and the amplitude is 1mm-1.5mm. Argon arc welding is used when welding the composite wire mesh 2 in step a, the welding current is 20A-70A, and the welding speed is 0.5m / min-1.5m / min. When welding the nozzle 5 in step c, argon arc welding is adopted, the welding current is 20A-70A, and the welding speed is 0.5m / min-1.5m / min. The precision of the composite wire mesh 2 is 25 μm to 400 μm. Two composite wire meshes 2 are separated by 3-10mm. The particle size of the ceramic powder 4 is 25 mesh to 400 mesh.

Embodiment 1

[0028] Two concentric annular 316L stainless steel composite screens are welded on the dense metal disc respectively. The filtration accuracy of the 316L composite screen is 250 μm, and the distance between the two composite screens is 8mm. Then fill the ring space formed by the dense metal disc and two 316L stainless steel composite wire mesh with 50 mesh Al 2 o 3 Ceramic powder, then on the high-efficiency vibration platform, the frequency is 1200Hz, the amplitude is 1.2mm to Al 2 o 3 Vibrate the ceramic powder for 10 minutes, and the tap density is 2.38g / cm 3 . Finally, the nozzle is welded at the open end of the annular gap, wherein the welding current is 70A, and the welding speed is 1.5m / min. After testing, the porosity of the filter element reaches 38%, the average pore size is 150μm, and the air permeability is 10000m 3 / m 2 ·KPa·h, the external compressive strength is 3.0KPa.

Embodiment 2

[0030] Two concentric annular 304 composite screens are welded on the dense metal disc respectively. The filtration accuracy of the composite screen is 25 μm, and the distance between the two composite screens is 3 mm. Then put 400 mesh Al in the ring space formed by the dense metal disc and two 304 composite wire mesh 2 o 3 Ceramic powder, then on the high-efficiency vibration platform, the frequency is 1500Hz, the amplitude is 1.5mm to Al 2 o 3 Vibrate the ceramic powder for 10 minutes, and the tap density is 3.16g / cm 3 . Finally, the nozzle is welded at the open end of the annular gap, wherein the welding current is 50A, and the welding speed is 1m / min. After testing, the porosity of the filter element reaches 30%, the average pore size is 20μm, and the air permeability is 5000m 3 / m 2 ·KPa·h, the external compressive strength is 3.2KPa. Example 3

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Abstract

The invention discloses a preparation method of a metal ceramic composite filtering element. The preparation method comprises the following steps: firstly, welding an inner annular composite metal wire net and an outer annular composite metal wire net, which are concentric, respectively on a compact metal sheet, so that the compact metal sheet and the two composite metal wire nets form an annular clearance with an open end; then putting ceramic powder in the annular clearance, and compacting; and finally, welding a pipe nozzle on the opening end of the annular clearance, and sealing the open end of the annular clearance, thereby preparing the metal ceramic composite filtering element. The filtering element prepared by the method provided by the invention not only has the characteristics of high ceramic powder precision and good abrasion resistance, but also has the advantages of thermal shock resistance, fracture resistance and favorable permeability of the composite metal wire nets.

Description

technical field [0001] The invention belongs to the technical field of high-temperature gas purification, and in particular relates to a preparation method of a cermet composite filter element. Background technique [0002] In the process of modern industrial production, there are a wide range of fields involving direct purification and dust removal of dusty gases at high temperatures, such as high-temperature gas purification in integrated gasification combined cycle (IGCC) power generation systems, high-temperature gas filtration and catalysts in petroleum catalytic cracking units recycling, steel plant blast furnace flue gas purification, high temperature waste gas purification of incinerator, metal industry, glass ceramics industry and other high temperature flue gas purification, etc. Due to the advantages of high temperature resistance and corrosion resistance, high temperature gas filters are widely used in high temperature gas purification technologies such as coal g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/20
Inventor 南海娟吴引江段庆文刘高建周济张晓晗王翠翠余勃强
Owner WESTERN BAODE TECH CO LTD
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