Patent ID: 7284491
Filing Date: 2007-10-23
Classification: C10J,F23H,Y02P

Abstract:
1. A solid fuel gasifier comprising: a housing defining a gasifier chamber; a grate structure in said gasifier chamber comprising a base, a plurality of agitator elements positioned relative to the base for reciprocating movement to agitate a fuel load in the gasifier, means to support the base and the agitator segments so that the latter reciprocate in a direction at a substantial inclination to both horizontal and vertical with an outward stroke that is also upward; and a solid fuel inlet; said grate structure arranged as a plurality of banks of agitator elements comprising a first bank that serves as a preheater and drying grate, and at least a second subsequent bank that provides for gasification of the fuel volatile matter and fixed carbon oxidation; whereby in use of the gasifier a deep burden of fuel accumulates on the grate structure, whereby said outward and upward stroke of said reciprocation is in the overall direction of flow of the fuel burden or generally oppositely thereto; and wherein said preheater and drying grate is arranged so that the agitator elements reciprocate in a direction more steeply inclined to the horizontal than that for the gasification grate(s).