Solid fuel pulverizer for pulverized fuel burning system
AssigneeTAS, Ltd.
InventorsWilliam H. Sayler, Justin C. White
Life of this patent
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Abstract
A solid fuel pulverizer especially useful in a system for pulverizing and burning solid fuel, such as coal or other fossil fuel, that is characterized by a possible turndown ratio of up to at least fifteen to one. The pulverizer is capable of both impact and autogenous pulverizing of the fuel so that about 80% will be no more than 40 microns in size and includes a series of impellers mounted for rotation on a preferably vertical shaft in a housing whose top wall has openings for the admission of air and a solid fuel to be pulverized. The fuel is pulverized by impact against the side walls of the housing and descends perpherially of the impellers to discharge adjacent to the bottom of the housing.
Claims9
A solid fuel pulverizer, comprising a vertical shaft rotatably mounted in a vertically positioned substantially cylindrical housing having a top wall, cylindrical side wall, and bottom wall;
- a series of horizontal impellers fixed to said shaft in mutually spaced arrangement and terminating short of but relatively close to said housing to define therewith relatively narrow peripheral flow space therearound, said impellers being provided with air-motivating, solid particle impact members thereon, and the inside face of the cylindrical side wall of said housing being provided with mutually spaced, substantially vertical, impact bars positioned within said flow space;
- a series of annular, substantially flat and horizontal partitions fixed to the housing, the individual partitions thereof extending peripherally inwardly thereof between mutually adjacent impellers, each of said individual partitions being spaced closely below and underlying a corresponding impeller to direct flow toward the axis of said shaft in opposition to centrifugal force exerted by the impellers;
- air inlet means in said top wall of the housing for introducing primary air to provide a carrier stream of air;
- solid fuel inlet means also in said top wall of the housing for introducing solid fuel to be pulverized;
- discharge conduit means adjacent to the lower end of the housing;
- and means for rotating the impeller shaft.
Dependencies are inferred from the claim text.