TECHNOLOGY FOCUS - CHEMICAL ENGINEERING - Preferred Process: The char reduction or conversion process comprises gasification step and total char combustion step. The combustion step incorporates a tar cracking step and is performed between pyrolysis and char gasification. Combustion and tar cracking are performed as single, combined, total char combustion and tar cracking step. The char conversion is performed in a char reduction reactor (CRC) for converting carbon of char, which is supplied directly from the biomass pyrolysis unit, into gas by reduction reactions. The converting step is performed in (TCC)2 reactor to completely convert the remaining carbon from CRC drain, to thermally crack the pyrolysis gases and to vitrify the residual ashes to eliminate as slag. The fluidized bed gasifier is combined with biomass pyrolyser and (TCC)2 reactor. The energy required for gasification of char is generated by (TCC)2 due to combustion of ashes and fraction of pyrolysis gases. A portion of char from pyrolysis unit is directly by-passed to (TCC)2 and a portion of ashes from CRC is recycled. A portion of (TCC)2 gases is by-passed in the pyrolyser used the energy from the hot gases for pyrolysis reaction. The gasification is started in the pyrolyser. The remaining portion of carbon in ashes and the tar flowing with pyrolysis gases are recycled to completely convert the original carbon content in the biomass. The high temperature combustion reactor has two zones: Z1 for combustion and melting of ashes resulting from gasification, and Z2 for cracking and/or combustion of pyrolysis gases.Preferred Conditions: Pyrolysis is performed at 500-1000 degreesC and under vibrating conditions. The combustion of gasification ashes is performed under stoichiometric conditions. The (TCC)2 is performed at 1200-1500 degreesC, preferably higher than 1300 degreesC to eliminate a liquid fraction containing mineral matters, which is produced during combustion of carbon with pyrolysis gases, as slag after vitrification. The temperature at the CRC outlet is higher than 700 degreesC to allow gasification reaction in fluidized bed reactor and less than 1000degrees to avoid partial ash slagging. The CRC has carbon conversion rate of 20-100 %. The zone Z1 is maintained at an elevated temperature of greater than 1200 degreesCPreferred Properties: The biomass has 50 % or less of ash content and 50 % or less of water content. The TCC allows 98 % carbon conversion of the initial carbon content of biomass and decreases the tar content of exhaust gases to 10-50 mg/Nm3. The treated biomass has 0.1 % of carbon in ash, 80 % of raw biomass energy efficiency, heat value of 5000 kJ/kg of dry gas with air and 7000 kJ/kg of dry gas with enriched air, nitrogen content of 43 % and low air factor of 0.26.