NOVELTY - Treating biomass containing burnable organic constituents, comprises: thermally drying the biomass to a reduced moisture content in a dryer; thermally torrefying at least a portion of the dried biomass in an indirect torrefaction reactor different than the dryer; and carbonizing at least a portion of the hot torrefied biomass from the first solid product output stream in an indirect carbonization reactor different than the torrefaction reactor using a portion of the hot gas output of the burner assembly to generate e.g. (i) a second solid product output stream.    USE - The process is useful for treating biomass (claimed), such as wood or crop residues, and food waste or animal waste, for preparing thermally processed final products, such as combination of torrefied and carbonized products i.e. charcoal.    ADVANTAGE - The improved process provides torrefied and carbonized products i.e. charcoal with high yield in high energy efficiency manner.    DETAILED DESCRIPTION - Treating biomass containing burnable organic constituents, comprises: thermally drying the biomass to a reduced moisture content in a dryer using the hot gas output of a fuel-operated burner assembly; thermally torrefying at least a portion of the dried biomass in an indirect torrefaction reactor different than the dryer using the hot gas output of the fuel-operated burner assembly to generate (a) a first solid product output stream comprising hot torrefied biomass, (b) a first burnable gaseous output stream comprising a first portion of the burnable organic constituents evolved from the torrefaction of the biomass, and (c) a first residual gas stream from the torrefaction reactor comprising the gas used to indirectly torrefy the dried biomass; and carbonizing at least a portion of the hot torrefied biomass from the first solid product output stream in an indirect carbonization reactor different than the torrefaction reactor using a portion of the hot gas output of the burner assembly to generate (i) a second solid product output stream comprising carbonized biomass, (ii) a second burnable gaseous output stream comprising a second portion of the burnable organic constituents evolved from the carbonization of the torrefied biomass, and (iii) a second residual gas stream from the carbonization reactor comprising the gas used to indirectly carbonize the torrefied biomass, where the drying, torrefying, and carbonizing steps are carried out continuously. An INDEPENDENT CLAIM is included for a system for treating the biomass, comprising: a fuel-operated burner assembly operable to generate hot output gas; a dryer coupled with the burner assembly and operable to dry the biomass to a reduced moisture content using hot gas from the burner assembly; an indirect torrefaction reactor coupled with the burner assembly and dryer for receiving dried biomass from the dryer, the torrefaction reactor operable to torrefy the dried biomass using hot gas from the burner assembly; and an indirect carbonization reactor coupled with the burner assembly and the torrefaction reactor, the carbonization reactor operable to carbonize at least a part of the hot torrefied biomass of the first solid output stream using hot gas from the burner assembly.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic flow diagram of a system for treating biomass.    Rotary drum dryer (12)    Rotary torrefaction reactor (14)    Rotary carbonization reactor (16)    Conventional dryer burner (18)    Conventional reactor burner. (20)