US 6,981,455 B2
Two-stage wet waste gasifier and burner
Malcolm D. Lefcort, 3040 West 5th Avenue, Vancouver, British Columbia V6K 1T9 (Canada)
Filed on Mar. 07, 2003, as Appl. No. 10/383,991.
Claims priority of provisional application 60/362831, filed on Mar. 08, 2002.
Prior Publication US 2003/0196577 A1, Oct. 23, 2003
Int. Cl. F23K 3/08 (2006.01)
U.S. Cl. 110—268 7 Claims
OG exemplary drawing
 
1. In or for use in a first-stage gasifier chamber of a two-stage biomass waste burner, a grate comprising
an array of vertically and horizontally spaced and longitudinally aligned waste support means;
vertically and horizontally spaced and longitudinally aligned ash support and removal means; and
vertically and horizontally spaced and longitudinally aligned air supply means;
wherein
the grate is substantially symmetrical about a vertical plane parallel to the longitudinal alignment of the ash removal plates;
the waste support means includes the ash support and removal means;
the air supply means are separate from the ash support and removal means;
the air supply means have ports for introducing air into the gasification chamber;
the ports are spaced from the ash support and removal means and, in operation, the ports introduce air into the gasification chamber in streams at a substantial angle to vertically upwards, thereby limiting interference between the air supply means and the ash support and removal means;
the ash support and removal means comprise vertically and horizontally spaced, stacked, longitudinally aligned and horizontally movable ash removal plates having varying widths increasing from top to bottom of the grate and each in extended position overlying a unique associated stationary grate support plate;
the ash support and removal means comprise reciprocating means for imparting to the ash removal plates synchronized reciprocating horizontal motion transverse to the longitudinal extension of the ash removal plates, thereby to direct ash downwardly from higher to lower ash removal plates;
the distance of travel of each said ash removal plate imparted by the reciprocating means varies with the width of such ash removal plate; and
the reciprocating means comprises a pendular drive having in the vicinity of its upper end a pivotally mounted driving arm, and for each said ash removal plate, means for pivotally coupling such support plate directly or indirectly to the pendular drive at an associated pendular drive coupling means, the pivot axis of each said coupling being horizontal and extending generally parallel to the longitudinal extension of the ash removal plates, the pendular drive coupling means being generally vertically spaced from one another along the driving arm at intervals generally corresponding to the vertical spacing between the ash removal plates.