Patent ID: 6312483
Filing Date: 2001-11-06
Classification: C10J,C10K

Abstract:
A method for generating combustible gases from a solid fuel comprising:a) semi-coking the solid fuel in a reactor in the absence of oxygen to produce a solids stream that includes carbonaceous material and a gas stream that includes hydrocarbon gases and tar fumes;b) gasifying the carbonaceous material in said solid stream in a fluidized bed using steam and hot air to produce an output stream that includes combustible gases and coke particles;c) combining said output stream with said gas stream to form a combined stream;d) separating said combined stream into a combustible gas stream and a hot particulate steam;e) dividing said hot particulate stream into a first portion that is applied to said reactor and a second portion that is burned to produce flue gases, and transferring heat from said flue gases to air for producing said hot air.