Abstract: A stoker comprising a housing defining first, second and third plenum chambers, a grate unit disposed at an upper end of each plenum chamber, a first residue removal means disposed at a lower end of the first plenum chamber, a second residue removal means disposed at a lower end of the second plenum chamber for receiving residue from the first residue removal means and a third residue removal means disposed at a lower end of the third plenum chamber for receiving residue from the second residue removal means.

Abstract: A stoker consisting of a support frame, a stationary assembly of longitudinally spaced sets of grates mounted on the support frame, a first movable assembly of longitudinally spaced sets of grates mounted on the support frame, the first movable assembly having first and second pluralities of grate sets, the first plurality of grate sets being disposed in a first set of alternate spaces between sets of grates of the stationary assembly, the second plurality of grate sets being disposed in successive spaces between sets of grates of the stationary assembly, a second movable assembly of longitudinally spaced sets of grates mounted on the support frame, the sets of grates of the second movable assembly being disposed in a second set of alternate spaces between sets of grates of the stationary assembly, and means for reciprocating the first and second movable assemblies.