Abstract: An improved hot gas filter candle is disclosed including an increase density flange portion adjacent the top of the filter for improving candle service life when the candle is mounted on a tube sheet. The area of flange densification is extended to a position beyond the bottom of the tube sheet. During vibration or swaying of the candle only the denser portion of the candle may impinge on the edge of the tube sheet aperture on which the candle is mounted Further, the denser portion of the candle is not so porous as to draw dirty particles into the clearance between the candle and the tube sheet aperture creating an area of increased stress in the candle adjacent the bottom of the tube sheet aperture.

Abstract: An improved cross flow ceramic filter is disclosed for utilization in high temperature, high pressure applications such as found in hot gas cleaning in coal based power generation. The cross flow ceramic filter of the present invention includes a plurality of identical corrugated sheets composed of chopped ceramic fiber matrix material and a plurality of predetermined sized end blocks shaped to fill the cross section passageways formed between the partly spaced corrugations of adjacent sheets of the filter material. One advantage of the corrugated sheet cross flow filter of the present invention is that the filter may be shipped to its site in semi-cured form unassembled. When the filter is received on site, the corrugated sheets are partially separated from each other until passageways of the desired dimension are achieved. Thereafter, the end blocks and glue may be applied between the blocks and the ends of the corrugated sheets and between the apexes of the corrugations where the corrugated sheets overlap.

Abstract: A unitary candle filter employs a wrapping of continuous filamentary ceramic material in the form of a yarn or twine wrapped over a porous ceramic support tube to hold the support structure intact during a high pressure backwash operation. A thin filtering layer of a ceramic material is deposited over the support structure and the wrapping is embedded in the filtering layer.

Abstract: The present invention is a combined gas flow resistance device and safety shield which incorporates a plurality of narrow parallel passageways through which filtered gas from a plurality of filter elements passes to a clean gas outlet. The device also has inlet for carrying pulses of high pressure gas to the downstream side of a plurality of filter elements, and a porous safety shield connected across the passageways to prevent solid particles from passing from the filter elements to the clean gas outlet.

Abstract: A hot gas filter utilizes a plurality of inclined, pie-shaped filter candle support members from which a plurality of filter candles are suspended in a filter chamber within a pressurized filter tank. The support members and associated filter candles are removable from the top of the tank for repair and maintenance, and a plurality of tiers of such assemblies are mounted in the tank.

Abstract: An improved filter candle is provided for filtering entrained particulate matter from hot gasses. The filter candle is constructed ceramic fibers bonded together into a porous unitary tubular mask having a bottom end and an annular flange at the top end. The top and bottom ends of the filter have substantially higher density than the tubular mid-section of the filter and as a result, the strength of the end portions of the filter is enhanced, and the ends are therefore less susceptible to damage.

Abstract: A combined hold-down and manifold member is formed of ceramic and holds a plurality of candle filters in sealing engagement with a ceramic tube sheet from which the filters are supported. The hold-down and manifold member supports a plurality of gas nozzles over the open ends of the candle filters to direct pulses of cleaning gas into the filters.

Abstract: A pressure filter includes a filter tank into which a rigid outlet conduit extends, and a plurality of clusters of filter tubes are suspended in the pressure chamber within the tank from a multi-tube manifold which is connected to and hangs from the outlet conduit. In the disclosed embodiment a purality of outlet conduits and associated manifolds and filter tubes are disposed within a single filter tank.

Abstract: A composite filter element for filtering hot gasses is made up of a porous ceramic core to which a porous ceramic, thin outer layer is integrally bonded. The outer layer has a mean pore size which is at least several times smaller than the mean pore size of the substrate and the substrate is at least several times thicker than is the outer layer. The outer layer and the substrate are preferably formed of the same material or of two different materials having essentially the same coefficient of thermal expansion.

Abstract: A filter suitable for the filtration of high temperature gasses includes a high pressure tank enclosing a chamber divided into a plurality of separate chambers by horizontally disposed rigid tube sheets. A plurality of banks of filter tubes are positioned in mutual alignment between adjacent ones of the tube sheets. Guide channels are provided on the tops and bottoms of the tube sheets for sealably mounting the filter tubes in place between the tube sheets. Fluid outlets open to the ambient through the wall of the tank between each adjacent pair of tube sheets and covers are removably secured over openings in the wall of the tank for access to the filter tubes.

Abstract: A multi-apertured flow control device is mounted over the exit end of a tubular filter element and is provided with a central bore through which a high velocity gas pulse is directed into the associated filter tube to dislodge a filter cake deposited on the exterior of the filter tube.

Abstract: A process for filtering fine particulates from a stream of hot gas wherein the particulates vary in size between about 0.15 and 250 microns includes the steps of removing a majority of the larger size particles from the gas stream, while leaving a majority of the smaller particles in the stream, then introducing into the gas stream particulates having an average size greater than the smaller size particulates, and thereafter passing the gas stream through a porous filter medium having a pore size exceeding the size of the smaller size particulates.

Abstract: A filter apparatus for clarifying liquids or gases includes a tank having a rigid horizontally disposed tube sheet contained therein for supporting a plurality of elongate tube filter elements. Each tube filter has an enlarged hub at one end configured with an exterior annular beveled surface. The tube sheet has apertures through which the tube filters extend and each aperture is configured with an interior annular beveled surface serving to cooperate with the beveled surface of a tube filter and prevent its downward movement within the tank. A gasket is interposed between the beveled surfaces of the tube sheet aperture and tube filter, and pins extend at an angle through the tube sheet into the hub of each filter for securing the filters in compressed engagement with the gaskets. The arrangement of the beveled surfaces and pins is such that the filter tubes remain sealed to the tube sheet regardless of the effects of differing coefficients of thermal expansion as between the filter tubes and tube sheet.

Abstract: Apparatus for filtering a fluid or gas stream under pressure includes a tank having inlet and outlet ports with a tube sheet disposed therebetween. The tube sheet supports one or more generally elongate filter tubes disposed in tube sheet apertures arranged in spaced relation one to another. Each filter tube has a flange which is sealed to the tube sheet by an annular gasket which expands as its temperature rises. The tube sheet is provided with upstanding circular wall members circumscribing the filter tube apertures. The inside diameter of the wall members is larger than the outside diameter of the filter tube flange forming a recess within which the flange is receivable. A plurality of through holes in the wall members receive pins extending across the filter tube flanges.

Abstract: An aqueous saline vapor is passed through a porous mass having a temperature no less than that of the vapor and subsequently condensed to provide substantially salt-free water.

Abstract: In the extraction of coal the liquid coal extract is filtered using a filter aid produced by washing the filter cake with a low viscosity, high boiling point, low vapor pressure ester and then calcining the cake to remove the wash solvent and other combustible constituents from the cake.