High-precision large-flow easy-to-backwash asymmetric metal sintered filter element

Abstract

The invention discloses a high-precision large-flow easy-to-backwash asymmetric metal sintered filter element. The filter element comprises a filter pipe and a mounting end arranged on the filter pipe. The mounting end and the open end of the filter pipe are integrally formed, and an axial through hole communicated with an inner cavity of the filter pipe is formed in the mounting end. The blind end of the filter pipe and the wall of the filter pipe are integrally formed. The filter pipe is composed of a cylindrical supporting layer formed through one-time sintering, a cylindrical transition layer and a cylindrical filter layer, wherein the cylindrical transition layer and the cylindrical filter layer are sequentially sintered on the cylindrical supporting layer. The mounting end is provided with a filter element positioning plate used for achieving mounting and positioning of adjacent filter elements and an external thread connecting pipe used for achieving connection and installationof the filter element and a filter element pipe plate. The invention further discloses a preparation method and application of the metal sintered filter element. Compared with a filter element with auniform aperture, the filter element with a gradient aperture is easier to backwash and regenerate, the required backwash pressure and system energy consumption are lower, and long-period operation isfacilitated.

Description

technical field [0001] The invention belongs to the technical field of asymmetric metal sintered filter elements, and in particular relates to an asymmetric metal sintered filter element with high precision and large flow and easy backwashing. Background technique [0002] Catalytic slurry filter is a filter device for removing catalyst particles in residual oil after catalytic cracking in ACO light oil processing unit. ACO catalyst slurry is used as a blending component of fuel oil, so it is necessary to further remove the impurity solid content in the catalyst slurry, and the filter device used requires the outlet solid content to be less than 50ppmw. The catalyst content in the catalyst slurry is as high as 12000~18000ppmw, the working temperature is 200°C and the slurry contains 10000ppmw colloid and asphalt, and the online backwash pressure is as high as 1.15MPa. Therefore, in order to achieve the target of the device, the required filtration accuracy and efficiency are...

AI Technical Summary

Problems solved by technology

[0013] The present invention provides a metal powder sintered filter element with gradual aperture diameter and its preparation method, aiming at solving the problem that the fine powder selection of the filter layer and the matching of the pore size of the substrate cannot take into account the backwashing effect and the strength of the filter element encountered in the production of asymmetric metal filter elements by the above-mentioned several methods The problem;

[0015] The invention provides an asymmetric metal sintered filter element with high precision, large flow rate and easy backwashing and its preparation method, which effectively solves the problems of filtration accuracy, filtration flow rate and backwashing effect in the actual application of the existing asymmetric metal sintered filter element. Insufficient consideration;

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