Patent ID: 9664445
Date: 2017-05-30
CPC Classifications: F26B,F27B

Claim:
1. A tubular reactor for thermal treatment torrefaction of solid biomass material into bio-coal, comprising: a rotatable reactor drum extending longitudinally along a material flow axis, wherein said reactor drum defines an internal reactor chamber ( 9 ) having a chamber wall ( 11 ), an inlet end ( 2 , 3 ) and an outlet end ( 7 , 8 ); a system ( 4 ) for indirectly ( 7 , 8 ) heating the reactor chamber that includes heating tubes ( 12 ) arranged longitudinally in the reactor chamber ( 9 ) with a heating medium passing through the tubes; a feeder device ( 3 ) for delivery of untreated solid material into the inlet end of the reactor chamber; a discharge opening ( 16 ) for removal of torrefied bio-coal material that has passed from the inlet end to the outlet end of the reactor chamber; wherein the reactor chamber is subdivided into a longitudinal series of reaction zones by a plurality of longitudinally spaced apart ring-shaped plates ( 10 ) having a radially inner edge; whereby in each zone the material accumulates and is thermally treated by the indirect heat while retained by said plates until mechanically transported intermittently over the inner edge of a respective plate into a next zone of the series of zones.