GASIFICATION APPARATUS

A combined fluidised bed (FB) and fixed bed (UB) gasifier in which the fixed bed gasifier is arranged in the path of the effluent gases from the fluidised bed gasifier. The fixed bed fuel (coal) acts as a filter for the entrained particles, char, ash etc. from the fluidised bed and in return the effluent gases devolatilise the fixed bed fuel. The latter is thus broken down and falls, or is driven, into the fluidised bed. The fixed bed (UB) may be arranged either (Fig. 1) directly above the fluidised bed (FB) or (Fig. 5) in an adjacent duct (27) from which it has to be driven up before falling into the fluidised bed.