High-precision filter element for adsorption desulfurization device, filter element assembly and preparation method

Abstract

The invention provides a high-precision filter element for an adsorption desulfurization device, a filter element assembly and a preparation method, the high-precision filter element is a gradient composite sintered metal filter element, and the preparation method of the high-precision filter element comprises the following steps: performing isostatic compaction on matrix powder to obtain a matrix powder green body; the base body powder green body is sintered for the first time under the vacuum condition, a base body powder sintered body is obtained, the thickness of the base body powder sintered body is 2-5 mm, and the average pore diameter of the base body powder sintered body is 5-35 micrometers; the surface of the matrix powder sintered body is coated with a filtering membrane coating, a gradient composite sintered metal filter element blank is obtained, the thickness of the filtering membrane coating ranges from 0.1 mm to 0.5 mm, and the average pore diameter of the gradient composite sintered metal filter element ranges from 3 micrometers to 7 micrometers. The problems that an existing sintered metal powder filter element is low in filtering precision, small in fluid flux and poor in back flushing effect, and a reactor filter cannot guarantee long-period stable operation of a gasoline adsorption desulfurization device due to the fact that the existing sintered metal powder filter element is low in filtering precision, small in fluid flux and poor in back flushing effect are solved.

Description

technical field [0001] The invention relates to the field of powder metallurgy materials and filtration technology, in particular to a high-precision filter element for an adsorption desulfurization device, a filter element assembly and a preparation method. Background technique [0002] In order to cope with the increasingly serious environmental pollution problems, many countries have continuously updated and revised environmental protection regulations, among which clear and strict regulations have been made on gasoline sulfur content indicators, such as the Euro III standard stipulates that the sulfur content of gasoline is less than 150ppm, and the Euro IV standard stipulates that the sulfur content of gasoline is less than 150ppm The standard stipulates that the sulfur content of gasoline should not exceed 50ppm. Therefore, in order to reduce the sulfur content in gasoline, gasoline adsorption desulfurization technology has emerged in response to the situation. The gas...

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Problems solved by technology

[0006] In order to overcome the defects of the prior art, the present invention provides a high-precision filter element for an adsorption desulfurization device, a filter element assembly and a preparation method to solve the problem of low filtration accuracy, small fluid flux and backflushing effect of the existing sintered metal powder filter element Poor and the resulting reactor filter cannot guarantee the long-term stable operation of the gasoline adsorption desulfurization unit

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