Preparation method of a honeycomb ceramic regenerator with ultra-thick outer wall

Abstract

The invention discloses a preparation method of a honeycomb ceramic regenerator with an ultra-thick outer wall. On the outer wall surface of a mold sleeve outside the honeycomb ceramic regenerator, grooves parallel to the extruding direction of mud are arranged at intervals, and the outer wall of the mold sleeve is The surface is processed so that the surface roughness is above 3.2, and pins are arranged in the mud entry hole on the outer wall of the outer mold casing. Spherical fine particle ceramic raw materials and auxiliary materials are selected, and after kneading, mud refining and aging, the mud is extruded with a mud refining machine. , and then add the mud material to the extrusion die sleeve of the extrusion molding machine to make a honeycomb ceramic green body. After the green body is dried and shaped, it is fired at a high temperature. The heat storage per unit volume of the present invention can be increased by 2% to 5%; heat exchange efficiency It can be increased by 3% to 5% accordingly, and the damage rate of the product in the process of handling, transfer, transportation and application assembly is significantly reduced; the deformation defect in the drying and firing process is significantly reduced, the firing pass rate is increased, and the product is reduced. rate, on the other hand to achieve the purpose of energy saving and emission reduction.

Description

technical field [0001] The invention relates to the technical field of porous ceramic processing, in particular to a preparation method of a honeycomb ceramic regenerator with an ultra-thick outer wall. Background technique [0002] Honeycomb ceramic regenerator is widely used in energy-saving technology of industrial thermal equipment, which can improve equipment efficiency and reduce energy consumption, and is an important means to solve energy and environmental problems. Honeycomb ceramics have high specific surface area and good physical and chemical stability, in addition to low density, high permeability, good energy absorption performance, high temperature resistance, corrosion resistance, high chemical stability and dimensional stability, easy to Regeneration and many other features. In recent years, with the development of preparation technology, its application range has been continuously expanded, and its application level has been continuously improved. [0003...

AI Technical Summary

Problems solved by technology

First of all, due to the thinner outer wall thickness of the honeycomb ceramic green body, the support strength of the green body is poor during the drying and firing process, and bending deformation is easy to occur, which reduces the qualified rate of the product

Especially in the preparation of large-scale honeycomb ceramic regenerators, the qualified rate of the product is often less than 50%; secondly, as a brittle material, honeycomb ceramics are easily damaged by vibration, scratches and collisions during handling, transfer and transportation. Edge defects, edge chipping, and even overall fragmentation, and the thinner outer wall thickness further exacerbates such losses

Even in the assembly stage when the product is put into use, there is also the problem of damage caused by the insufficient strength of the outer wall of the honeycomb ceramic regenerator. All of the above problems have led to a great reduction in the use rate of the product and caused great unnecessary waste.

[0004] However, due to the limitations of the shape and formula of the honeycomb ceramic regenerator, the ratio of the thickness of the inner wall to the outer wall is difficult to break through 1:1.5, because when the thickness of the outer wall of the green body is further increased, the extrusion speed of the outer wall of the mold is much higher than The extrusion speed of the inner wall extrusion area, which causes the blank to be unable to form a whole after being extruded through the die, and even causes the inner core and the outer wall to separate into two parts

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