Patent ID: 8486168
Filing Date: 2013-07-16
Classification: C10J,C10K,Y02E

Abstract:
1. A method for the gasification of solid fuel to produce a combustible effluent using a gasifier comprising: a) a solid fuel valve that supplies solid fuel to 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; which method comprises the steps of: 1) partially oxidising a biomass fuel in the first oxidation zone to produce char; 2) reducing the char in the reduction zone to form ash; 3) further oxidising any char residue in the ash in the second oxidation zone; and 4) extracting the combustible effluent produced in the above steps, by the discharge pipe wherein in the first oxidation zone the gas flow is in the same direction as fuel flow and in the second oxidation zone the gas flow is in the opposite direction to the fuel flow.