| abstract |
A gasifier ( 1 ) for the gasification of biomass and waste to produce combustible effluent, comprising: a fuel valve ( 22 ) for loading solid fuel ( 11 ) into a first oxidation zone ( 8 ); a first throat ( 2 ) defining the lower edge of the first oxidation zone ( 8 ); a second throat ( 4 ) defining the lower edge of a second oxidation zone ( 14 ); a reduction zone ( 5 ) linking the first oxidation zone ( 8 ) to the second oxidation zone ( 14 ) and ; two oppositely located (at the reduction zone) vortex discharge pipes ( 18 ) for the combustible effluent 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; n a method for the gasification of biomass and waste to produce a combustible effluent using the gasifier, comprising the steps of: partially oxidising a biomass fuel in the first oxidation zone ( 8 ) to produce char; reducing the char in the reduction zone ( 5 ) to form ash; further oxidising any char residue in the ash in the second oxidation zone ( 14 ); extracting the combustible effluent produced in the above steps, by the discharge pipe ( 18 ) 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; a novel gasification system and method incorporating the gasifier, a novel filter and method for filtration for use in the system; a novel polymer for use in the filter; and the use thereof in combusting solid fuel such as biomass, fossil fuel, waste, or combinations thereof in producing combustible gases for energy generation. |