Asymetric membrane FeAl intermetallic compound porosint filter element and application thereof

A technology of intermetallic compounds and filter elements, which is applied in the fields of filtration and separation, chemical instruments and methods, and gas dust removal, etc. It can solve the problems of serious corrosion of washing equipment, long purification process, and many processes, and achieve good high-temperature oxidation/sulfurization resistance. , Expand the scope of the use of the environment, shorten the effect of the process

Active Publication Date: 2011-04-13
CHENGDU INTERMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the first method is that the high-temperature gas needs to be cooled first, which requires the use of corresponding gas cooling equipment or water resources, and consumes a lot of energy.
[0018] The disadvantages of the current converter gas dedusting and purification methods are: wet dedusting requires a large amount of water, and causes secondary water pollution, serious corrosion of washing equipment, water in the gas, long purification process, many procedures, large energy consumption, and unsatisfactory purification effect ;Dry electrostatic precipitator has a large investment and is prone to explosion
In the actual use process, it is found that there are problems with ceramic porous materials: the pore-forming mechanism of ceramic porous materials leads to poor backflush regeneration effect, fast decay of filtration capacity, and short life; the inherent hardness and brittleness of ceramics makes ceramic porous materials resistant to heat under high temperature conditions Poor shock and pressure fluctuation resistance, easy to crack the pipe
The above reasons lead to frequent replacement of broken ceramic filter elements during production and use, which also makes production discontinuous and greatly increases production costs
Moreover, the gas has to be discharged into the atmosphere during the pipe replacement process, resulting in aggravated environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1 Preparation of filter element

[0051] The Fe powder with an average particle size of 100μm and the Al powder with an average particle size of 90μm are mechanically mixed according to the ratio of Fe-30at% Al (that is, the number of Fe atoms is 70% of the total number of atoms), and then the ordinary molding method is used at 240MPa The sheet blank (￠350×4.0mm) is pressed under the pressure of the same. Sintering in a vacuum atmosphere, the vacuum degree is controlled at 1.0×10 -1 ~1.0×10 -2 Pa. First sinter at 130°C for 45 minutes to remove adsorbed water. Subsequently, medium temperature solid phase diffusion was performed at a temperature of 520°C for 60 minutes. The final high-temperature component homogenization and structure stabilization treatment temperature is 1050° C., the time is 120 minutes, and the cooling process produces a FeAl intermetallic compound porous support with a maximum pore size of 35 μm and a porosity of 43%.

[0052] Fe and Al powders...

Embodiment 2

[0055] Example 2 Preparation of filter element

[0056] Fe powder with an average particle size of 5μm and Al powder with an average particle size of 10μm are mechanically mixed according to the ratio of Fe-60at% Al, and then pressed into a sheet blank (￠300×3.5 mm). Sintering in a vacuum atmosphere, the vacuum degree is controlled at 1.0×10 -1 ~1.0×10 -2 Pa. First, heat at 150°C for 50 minutes; then, carry out intermediate temperature solid phase diffusion at 560°C for 120 minutes. The final high-temperature component homogenization and structure stabilization treatment temperature is 1100°C, and the time is 30 minutes. A FeAl intermetallic compound porous support with a maximum pore diameter of 12 μm and a porosity of 38% was prepared.

[0057] Fe and Al powders with an average particle diameter of 1.0 μm are uniformly mixed at a ratio of Fe-60 at% Al to prepare a powder mixture; ethylene glycol and polyvinyl alcohol are mixed at a mass ratio of 1:1 as organic additives. The ...

Embodiment 3

[0060] Example 3 Preparation of filter element

[0061] Fe powder with an average particle size of 40μm and Al powder with an average particle size of 30μm are mechanically mixed at the ratio of Fe-40at% Al, and then compressed by cold isostatic pressing at a pressure of 180MPa, and the core rod taper is 1.8 °, after manual demolding, a tubular shaped blank (Ф50*300mm) with a slightly taper inner diameter (3°) is obtained. Adopt vacuum atmosphere for sintering, the vacuum degree is controlled at 1.0×10 -1 ~1.0×10 -2 Pa. First, heat at 120°C for 30 minutes to remove the adsorbed water; then, carry out medium-temperature solid phase diffusion at 600°C for 120 minutes. The final temperature of high-temperature component homogenization and structure stabilization treatment is 1200 DEG C, and the time is 90 minutes to prepare a FeAl intermetallic compound porous support.

[0062] Fe and Al powders with an average particle size of 1.5μm are mixed according to the ratio of Fe-40at% Al t...

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PUM

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Abstract

The invention belongs to the field of inorganic porosint and particularly relates to an asymetric membrane FeAl intermetallic compound porosint filter element and the application thereof. The filter element of the invention consists of a multiaperture support body and complex film; wherein, the multiaperture support body is in tubular shape or platy shape, the complex film is made in the following steps: a compound sizing agent is coated on outer surface of a single side of the multiaperture support body; and degreasing, bias diffusion, reaction synthesis and sintering are carried out to formthin-layer complex film with millipores. The millipores on the surface of the filter element is small and uniform, porosity is high, no dust is blocked inside filter material, filtering gas circuit is smooth, and resistance is small; in addition, the element has good resistance to high temperature oxidation / vulcanization and good normal temperature and high temperature mechanical properties. Theelement can directly carry out solid-gas separation on industrial gasses, bear top load and high-pressure and high-speed back washing, thus saving relative cooling devices, saving a large amount of water resources, avoiding cooling water treatment, lowering energy loss, shortening process flow and improving work efficiency.

Description

Technical field [0001] The invention belongs to the field of inorganic porous materials, and particularly relates to an asymmetric membrane FeAl intermetallic compound porous material filter element and its application. Background technique [0002] High-temperature gas usually refers to industrial gas with a temperature above 250℃, such as metallurgy, steel plant blast furnace or converter gas waste heat recovery, coal chemical industry, coal-fired boilers, thermal power generation, industrial furnaces, calcination and incineration of sulfur-containing minerals, etc. High temperature gas produced in the process. Industrial high-temperature gas not only has the characteristics of high temperature (usually 150℃~1400℃) and dust, but also contains a lot of corrosive substances and dangerous substances (such as CO, H 2 , CH 4 Wait). Therefore, the high-temperature gas dust removal and purification device must have the characteristics of high temperature resistance, heat shock resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/02C21C5/40C21B7/22C10K1/02
CPCY02P10/25
Inventor 高麟贺跃辉徐进辉汪涛
Owner CHENGDU INTERMENT TECH
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