Nozzles for fluidized bed vessel construction plate

Claim 2

A nozzle for a fluidized-bed heat transfer apparatus of the type having a constriction plate with a plurality of spaced holes in which the nozzles are installed, a plenum chamber for the fluidizing gas under the constriction plate, and a heat transfer chamber above the constriction plate in which a bed of particulate material is formed, the combination which comprises: a. a vertical tubular member mounted in one of the holes of the constriction plate, said tubular member being adjustable vertically and projecting above the constriction plate into the bed of material; and b. a cap member removably attached to the upper end of said tubular member, said cap member having a closed top portion and a vertical skirt portion depending from said top portion, said skirt being provided with a plurality of orifices controlling the flow of gas, said skirt having a vertical wall of sufficient thickness for each of said orifices to form a downwardly inclined passageway connecting the interior of said cap member above the top of said tubular member to a discharge point on the outer surface of said skirt portion, whereby the fluidizing gas can flow under pressure from below the constriction plate relatively unrestrictedly through the bore of said vertical tubular member into the interior of said cap member and then flow controllably downwardly and outwardly through said plurality of orifices in said cap member to uniformly distribute the gas into the bed of particulate material surrounding the base of said tubular member to thereby fluidize the bed of particulate material and to prevent buildup of material around the base of said tubular member.

Claim 3

A nozzle for a fluidized bed heat transfer apparatus of the type having a constriction plate with a plurality of spaced holes in which the nozzles are installed, a plenum chamber under the constriction plate with a source of fluidizing gas under pressure, and a heat transfer chamber above the constriction plate in which a bed of particulate material is formed, the combination which comprises: a. a vertical tubular member removably and adjustably mounted in one of the holes of said constriction plate and projecting above the constriction plate into the bed of material, said tubular member having a relatively unrestricted internal passageway therethrough communicating with the plenum chamber; and b. a cap member removably attached to the upper end of said tubular member, said cap member having a short annular body portion, a closed top portion, and pressure tight fastening means for attaching said cap member to said tubular member, said cap member having a plurality of orifices in the periphery of said body portion, said Orifices controlling the flow of fluidizing gas to the bed of particulate material, said annular body portion having a vertical wall of sufficient thickness for each of said orifices to form a downwardly inclined passageway connecting the interior of said annular body portion above the top of said tubular member to a discharge point on the periphery of said body portion, whereby the fluidizing gas can flow unrestrictedly from the plenum chamber through the tubular member into the annular body portion of the cap member and then be uniformly distributed through the plurality of inclined orifice passageways in said cap member into the bed of particulate material around the base of the tubular member to thereby fluidize this material and upon stopping the flow of pressurized fluidizing gas, the inclined passageways prevent the inward flow of material into the nozzle which might thereby plug the nozzle.

Claim 4

A nozzle for a fluidized bed heat transfer apparatus of the type having a constriction plate with a plurality of spaced holes in which the nozzles are installed, a plenum chamber under the constriction plate with a source of fluidizing gas under pressure, and a heat transfer chamber above the constriction plate in which a bed of particulate material is formed, the combination which comprises: a. a vertical tubular member removably and adjustably mounted in one of the holes of said constriction plate and projecting above the constriction plate into the bed of material, said tubular member having a relatively unrestricted internal passageway therethrough communicating with the plenum chamber; and b. a cap member removably attached to the upper end of said tubular member, said cap member having a short annular body portion, a closed top portion, and pressure tight fastening means for attaching said cap member to said tubular member, said cap member having a plurality of orifices in the periphery of said body portion, said Orifices controlling the flow of fluidizing gas to the bed of particulate material, said annular body portion having a vertical wall of sufficient thickness for each of said orifices to form a downwardly inclined passageway connecting the interior of said annular body portion above the top of said tubular member to a discharge point on the periphery of said body portion, whereby the fluidizing gas can flow unrestrictedly from the plenum chamber through the tubular member into the annular body portion of the cap member and then be uniformly distributed through the plurality of inclined orifice passageways in said cap member into the bed of particulate material around the base of the tubular member to thereby fluidize this material and upon stopping the flow of pressurized fluidizing gas, the inclined passageways prevent the inward flow of material into the nozzle which might thereby plug the nozzle.

Claim 5

In a nozzle for a fluidized bed heat transfer apparatus of the type having a constriction plate in which a plurality of the nozzles are mounted, a plenum chamber under the constriction plate with a source of fluidizing gas under pressure, and a heat transfer chamber above the constriction plate in which a bed of particulate material is formed, the improvement which comprises: a. a vertical hollow member removably mounted in the constriction plate, the hollow portion of said member providing a relatively unrestricted communicating passage between the plenum chamber and the top of said hollow member, said hollow member being adjustably mounted in the constriction plate to vary the projection of the nozzle into the bed of material above the constriction plate; and b. a cap member detachably secured to the upper end of said hollow member, said cap member having an annular body portion, a closed top portion and pressure tight fastening means for securing said cap member to said hollow member, said body portion having a plurality of orifices providing a series of passageways from the interior of said body portion above the top of said hollow member to the outer periphery of said body portion, said passageways being inclined downwardly and being oriented radially from the center of said cap member, said annular body portion having a sidewall thickness such that the interrelationship between the vertical height of the orifice, the angle of inclination of the orifice passageway and the angle of repose of the particulate material will not permit the particulate material to flow upwardly through the inclined passageway and into the interior of the cap member when the flow of pressurized fluidizing gas is stopped, said orifices further providing for controlled flow of the fluidizing gas from the interior of said cap member to uniformly distribute the gas into the particulate material to thereby fluidize the bed of material and to prevent buildup of the material around the base of said hollow member.

Claim 6

In a nozzle for a fluidized bed heat transfer apparatus of the type having a constriction plate in which a plurality of the nozzles are mounted, a plenum chamber under the constriction plate with a source of fluidizing gas under pressure, and a heat transfer chamber above the constriction plate in which a bed of particulate material is formed, the improvement which comprises: a. a vertical hollow member removably mounted in the constriction plate, the hollow portion of said member providing a relatively unrestricted communicating passage between the plenum chamber and the top of said hollow member, said hollow member being adjustably mounted in the constriction plate to vary the projection of the nozzle into the bed of material above the constriction plate; and b. a cap member detachably secured to the upper end of said hollow member, said cap member having an annular body portion, a closed top portion and pressure tight fastening means for securing said cap member to said hollow member, said body portion having a plurality of orifices providing a series of passageways from the interior of said body portion above the top of said hollow member to the outer periphery of said body portion, said passageways being inclined downwardly and being oriented radially from the center of said cap member, said annular body portion having a sidewall thickness such that the interrelationship between the vertical height of the orifice, the angle of inclination of the orifice passageway and the angle of repose of the particulate material will not permit the particulate material to flow upwardly through the inclined passageway and into the interior of the cap member when the flow of pressurized fluidizing gas is stopped, said orifices further providing for controlled flow of the fluidizing gas from the interior of said cap member to uniformly distribute the gas into the particulate material to thereby fluidize the bed of material and to prevent buildup of the material around the base of said hollow member.