Patent ID: 8252072

Claim:
A gasifier for the gasification of biomass and waste to produce combustible effluent, comprising: a) a solid fuel valve that supplies solid fuel to a pyrolysis zone above a first oxidation zone and an air inlet that supplies oxygen to combust the fuel in the first oxidation zone; b) a first throat defining the lower edge of the first oxidation zone; c) a second throat defining the lower edge of a second oxidation zone; d) a reduction zone linking the first oxidation zone to the second oxidation zone; and e) a vortex discharge pipe for the combustible effluent; wherein gas flows in the first oxidation zone and the reduction zone in the same direction as fuel flow and gas flows in the second oxidation zone in the opposite direction to the fuel flow, and the cross-sectional area of the first oxidation zone is less than that of the pyrolysis zone.