ASH PRODUCTION CONTROLLING VALVE FOR A CIRCULATORY FLUIDISED-BED COMBUSTION CHAMBER ASSEMBLY

摘要

An ash control valve apparatus for use in a system that includes a fluidized-bed system which includes a housing, a seat in the housing for passage of particulate material, a plug dimensioned and configured for mating engagement with the seat, and apparatus for moving the plug from a first position wherein the plug is disposed in seated engagement with the seat to a second position wherein the plug is disposed in spaced relationship to the seat. The apparatus for moving the plug includes apparatus for mounting the plug that includes an elongated tube to which the plug is fixed. The apparatus for mounting includes a plurality of axially extending ribs disposed on the circumference of the elongated tube and a plurality of channels disposed in a bore in the plug. Apparatus in the plug cooperates with the plurality of channels to define a bayonet type receiving structure dimensioned and configured for receiving the plurality of axially extending ribs and allowing relative rotational movement between the plug and the ribs to produce locking engagement therebetween. In some forms of the apparatus the apparatus for cooling the tube includes a concentric hollow internal member for directing flow of a coolant along the axial extent of the tube. A portion of the tube may extend through a wall of the housing opposite the seat; and a bonnet assembly may surround the axial portion of the tube may extending through a wall of the housing, the bonnet assembly insures a dynamic seal between the tube and the bonnet assembly as the tube is moved axially from the first position to the second position.