US 4,979,969 AGranted

Filter for the separating of solids particles from hot, gaseous or liquid media

AssigneeHerding GmbH

InventorWalter Herding

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Abstract

A filter for the separating of solids particles from hot, gaseous or liquid media, especially separating dust particles from hot flue gases in the temperature range of within 250.degree. C. to 800.degree. C., which consists of a permeable, inherently stable carrier material or substrate which is provided with larger pores; in essence, a support member in which the carrier material is constructed so as to be heat-resistant, and which especially contains constituents of non-corroding materials, such as glass, ceramic, metals or compounds thereof; and in which filter the carrier material can be produced through the intimate, partial bonding of the heat-resistant particles thereof, and wherein the carrier material also possesses a strucutre or, essentially, a spatial or three-dimensional configuration, which is correlated with the type of utilization and the specified capacity. The carrier material is covered at least on the outer surface along its mantle surface with a filler material allowing for finer pores, which is fine-grained and also heat-resistant, wherein the filler material is, in particular, applied as a thinner film-like coating on the carrier material, and in which this film material is constituted from particles of a dispersed mixture, of which one part is volatilized out of the mixture during a baking process, and in contrast therewith another part is introducible into the larger pores of the carrier material.

In a filter for the separation of solids particles from hot, gaseous or liquid media, especially dust particles from hot flue gases in the temperature range of between 250.degree. C. to 800.degree. C., including a permeable, inherently stable, heat-resistant carrier material forming a support member and having larger-sized pores, said material containing constituents of non-corroding materials selected from the group consisting of glass, ceramic, metal compounds, said carrier material being producible through intimate partial bonding of the heat-resistant particles thereof and having a structure correlated with the intended utilization and specific capacity of the filter;

the improvement comprising in that the larger-pored carrier material has at least the outer surface of the mantle surface thereof covered with a heat-resistant, ceramic fine-grained filler material for the formation of finer pores, said- filler material being applied on the carrier material as a thin covering, said filler material being constituted of parts of a dispersed mixture, a portion of said mixture being introducible into the larger pores of the carrier material and another portion being volatilized during a firing process, said mixture being produced through an adhesive agent and suspension liquid and applied in this aggregate condition thereof onto the carrier material where it is partly bonded with itself and partly with the carrier material, the fine-grained constituents of the filler material and the adhesive agent each being constituted from material having a linear coefficient of thermal expansion which is generally equal to that of the carrier material, the material of the filler material being dimensioned in, the grain size thereof such that the pore size of said filter material is still below 10 .mu.m, and said filler material is introduced into the larger pores about the mantle region of the carrier material and there at least partly fills the larger pores of the carrier material.

Abstract

Claims19