Device for filtering dust from gas

Apparatus for filtering dust from hot gas, comprising:

• a housing with a dirty-gas zone and a clean-gas zone and having porous-walled hollow structures that are continuous with the exception of an outlet opening into the clean-gas zone;
• a support fixed in said clean-gas zone;
• a tube surrounding said outlet and having an area with spherically convex base resting against a support in said clean-gas zone;
• an annular adapter between a base of said tube and said support and having a coefficient of linear heat expansion approximating at least that of said tube, said annular adapter fitting and resting against said convex base of said tube, said annular adapter having another flat surface resting against a matching flat surface on said support so that said adapter can slide horizontally over said support;
• said adapter and said support having mutually facing annular shoulders with a distance between said shoulders, said distance between said shoulders being at least equal to the greatest possible horizontal distance between the heat expansions of said adapter and said support.

Apparatus for filtering dust from hot gas, comprising:

• a housing with a dirty-gas zone and a clean-gas zone and having porous-walled hollow structures that are continuous with the exception of an outlet opening into the clean-gas zone;
• a support fixed in said clean-gas zone;
• a tube surrounding said outlet and having an area with spherically convex base resting against a support in said clean-gas zone;
• an annular adapter between a base of said tube and said support and having a coefficient of linear heat expansion approximating at least that of said tube, said annular adapter fitting and resting against said convex base of said tube, said annular adapter having another flat surface resting against a matching flat surface on said support so that said adapter can slide horizontally over said support fixedly connected to said clean-gas zone, sliding of said adapter relative to said support occurring over oppositely-lying flat parallel surfaces, one of said flat parallel surfaces being on said support and the other of said flat parallel surfaces being on said adapter, said support and said adapter being free to expand in all directions due to said sliding and different heat expansions being stress-free, said flat parallel surfaces remaining parallel and in contact during said heat expansions for generating air-tightness between said flat parallel surfaces also at high temperatures and large temperature variations;
• said tube being ceramic and said clean-gas zone being metallic, thermal stresses being avoided through the coefficients of linear heat expansion and clamping said convex base of said tube to said support is avoided, an air-tight connection being maintained between said ceramic tube and said metallic clean-gas zone.