Grate for coal gasifier
AssigneeGeneral Electric Company
InventorStanley J. Godwin
Life of this patent
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Abstract
An improved grate construction for a fixed bed coal gasifier comprises an interrupted generally cylindrical platform including a plurality of sector-like portions and rotatable means, e.g. a stirrer, mounted for rotation adjacent the upper surface of each platform portion. The upper surface of each portion is inclined upwardly in a circumferential direction to an upper leading edge thereof from which an upright wall depends. The stirrer is rotated in the opposite circumferential direction for cooperating with the depending walls to reduce the size of clinkers and for promoting movement of solids from the shaft over the platform.
Claims11
In an apparatus for producing a fuel gas from coal including a shaft disposed over an enclosed grate assembly whereby coal moving by gravity down said shaft is subjected first to carbonization and then to reduction, the improvement for reducing the size of clinkers wherein said grate assembly comprises, in combination:
- (A) a generally cylindrical platform including means in the upper surface thereof for defining a generally radially extending notch therein and
- (B) means rotatable relative to said platform in a plane generally parallel thereto and in register with said notch-defining means to co-act therewith in a scissors-like action.
In a process for producing a fuel gas from coal by subjecting the coal to carbonization and then to reduction as it moves by gravity down a shaft, with the solids remaining at the lower end of said shaft being removed from the gasification process by passage through a grate structure including a platform, the improvement comprising the step of:
- reducing the size of clinkers contained in the solids on the platform by trapping the clinkers in a notch defined in the upper surface of said platform by a generally upright wall and an inclined surface thereof and simultaneously applying a shearing force to the clinkers by rotating an arm relative to said notch in cooperation with said upright wall to effect size reduction of the trapped clinkers in a vertical dimension thereof to a value of not more than the height of the wall above the inclined surface.
Dependencies are inferred from the claim text.