Asymetric membrane FeAl intermetallic compound porosint filter element and application thereof

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 form thin-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. The element 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, in particular to an asymmetric membrane FeAl intermetallic compound porous material filter element and its application. Background technique [0002] High-temperature gas usually refers to industrial gases with a temperature above 250°C, 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 and other industries High temperature gas generated during the process. Industrial high-temperature gas not only has the characteristics of high temperature (generally 150 ° C ~ 1400 ° C) and dust, but also often contains a large amount 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 hig...

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.