Method and treatment facility for physical and thermochemical treatment of biomass

A method for physically and thermochemically treating a biomass, the method comprising:

• providing a biomass to be treated,
• providing a drying device,
• providing a pyrolysis reactor,
• providing a combustion device,
• providing a mixing device,
• feeding the biomass to be treated into the drying device, wherein a moisture contained in the biomass is reduced and ammonia (NH3) is released from the biomass during a drying process,
• discharging the biomass to be treated from the drying device,
• feeding the biomass to be treated into the pyrolysis reactor,
• pyrolyzing the biomass in the pyrolysis reactor, thereby thermally decomposing the biomass into pyrolysis coke and pyrolysis gas,
• discharging the pyrolysis coke and discharging the pyrolysis gas from the pyrolysis reactor,
• feeding the pyrolysis gas discharged from the pyrolysis reactor into the combustion device and combusting the pyrolysis gas thus forming a flue gas,
• discharging the flue gas from the combustion device and feeding the flue gas into the mixing device,
• adding oxygen (O2) and/or at least an oxygen (O2)-containing gas to the flue gas in the mixing device and forming a drying gas, the drying gas containing, inter alia, sulfur dioxide (SO2) and/or sulfur trioxide (SO3),
• discharging the drying gas from the mixing device and feeding the drying gas into the drying device,
• guiding the drying gas through the drying device, wherein the sulfur dioxide (SO2) and/or the sulfur trioxide (SO3), which is inter alia contained in the drying gas, chemically reacts with the ammonia (NH3) to form ammonium sulfite ((NH4)2SO3) and/or to form ammonium sulfate ((NH4)2SO4).