초록 ▼

A filtering apparatus for separating particulates from a hot gas stream using hollow, tubular filter elements has a housing with a laterally extending support plate for the filter elements separating the housing into upper and lower sections. The tops of the filter elements are biased against the su

A filtering apparatus for separating particulates from a hot gas stream using hollow, tubular filter elements has a housing with a laterally extending support plate for the filter elements separating the housing into upper and lower sections. The tops of the filter elements are biased against the support plate and the bottoms thereof restrained from lateral movement by restraining rings. Blowback and purge gas systems provide for cleaning of the filter elements and maintenance of the blowback system clear of the solids or condensation products that might form during the separation. The apparatus is especially useful in filtering solids from a hot, corrosive gaseous stream, such as a zirconium tetrachloride process gas stream, where the gas stream contains gaseous constituents that are subject to condensation or solids formation during separation of the particulates and prior to discharge from the filtering apparatus.

대표청구항 ▼

In an apparatus for filtering of particulates from a particulate-containing high temperature gas stream wherein the gas stream is passed through the walls of a hollow, tubular filter element having an outer wall and clean gas discharged from an open end of the filter element and particulates collect

In an apparatus for filtering of particulates from a particulate-containing high temperature gas stream wherein the gas stream is passed through the walls of a hollow, tubular filter element having an outer wall and clean gas discharged from an open end of the filter element and particulates collected on the outer wall thereof, with means provided to pass a blowback gas into the open end of the filter element to discharge collected particulate material from the outer wall thereof and clean the same, the improvement comprising: a housing, having a wall with an inner surface and an interior diameter, and having a lower section with an open bottom and an upper closed section having a discharge vent therein; means extending laterally across said housing for dividing said housing and sealing the same into said upper and lower sections comprising a support plate having a plurality of orifices therethrough in which a plurality of the hollow, tubular filter elements are suspended, said support plate having a diameter less than the interior diameter of the housing; laterally flexible means connecting the support plate to the inner surface of the wall of the housing, comprising a U-shaped ring member formed from a pair of downwardly depending skirts, one of said pair of skirts connected to the support plate and the other of said skirts connected to the wall of the housing, with a closure plate connecting said two skirts together at the bottom thereof; means on said dividing means for suspending said plurality of said hollow, tubular filter elements such that the same extend into said lower section of the housing with the open ends thereof communicating with the upper section of the housing; and means within said lower section of the housing for restraining the bottoms of said filter elements from lateral movement, whereby a particulate-containing high temperature gas stream passed into said lower section of the housing passes through the hollow, tubular filter elements into said upper section and clean gas is discharged through said discharge vent. In an apparatus for filtering of particulates from a particulate-containing high temperature gas stream wherein the gas stream is passed through the walls of a hollow, tubular filter element having an open top and an outer wall and clean gas discharged from the open top of the filter element and particulates collected on the outer wall thereof, with means provided to pass a blowback gas into the open top of the filter element to discharge collected particulate material from the outer wall thereof and clean the same, the improvement comprising: a housing having a lower section with an open bottom and an upper closed section having a discharge vent therein; a filter element support plate, having a plurality of orifices therethrough, extending laterally across said housing for dividing said housing and sealing the same into said upper and lower sections; means on said support plate for suspending a plurality of said hollow, tubular filter elements through the orifices thereof, such that the same extend into said lower section of the housing with the open tops thereof communicating with the upper section of the housing, said support plate having a bevelled portion about the top edge of each of said orifices and each of said hollow, tubular filter elements having a complementary bevelled shoulder about the open top thereof which nests in said bevelled portion; a gasket disposed between each bevelled portion of the support plate and the complementary bevelled shoulder of said hollow, tubular filter elements; biasing means provided on the support plate to bias each of the complementary bevelled shoulders of said hollow, tubular filter elements into contact with the bevelled portions of the support plate; means within said lower section of the housing for restraining the bottoms of said filter elements from lateral movement, whereby a particulate-containing high temperature gas stream passed into said lower section of the housing passes through the hollow, tubular filter elements into said upper section and clean gas is discharged through said discharge vent. A process for separating particulate material from a particulate-containing hot stream of zirconium tetrachloride gas, which contains gaseous constituents that are subject to condensation or solids formation during said separation comprising: passing said particulate-containing hot stream of zirconium tetrachloride gas into a housing having separated upper and lower sections, said gas being passed into the lower section of said filter housing having ceramic, hollow, tubular filter elements therein, which ceramic, hollow, tubular filter elements each have an outer surface and an open top; passing said hot stream of zirconium tetrachloride gas through said ceramic, hollow, tubular filter elements whereby solid particulates collect on the outer surfaces thereof and a filtered gas stream is discharged from the open tops of said ceramic, hollow, tubular filter elements into the separated upper section of the filter housing and discharged therefrom; sensing the pressure within said lower section and said upper section of the filter housing to determine a pressure differential therein caused by collection of said solid particulates on the outer surfaces of the ceramic, hollow, tubular filter elements in said lower section; periodically dislodging, upon sensing of a predetermined pressure differential, said particulate solids from the ceramic, hollow, tubular filter elements by passage of a blowback gas through said ceramic, hollow tubular filter elements from the open tops thereof, through ports in conduits spaced from the open tops of said ceramic, hollow, tubular filter elements, and a pressurized gas is continually passed through said ports to prevent ingress of said zirconium tetrachloride gas thereto; and maintaining the temperature of the upper section and lower section of said filter housing at a temperature in excess of about 450°C. to prevent condensation or solids formation of said gaseous constituents in the hot zirconium tetrachloride gas stream.