Production technology

Green Fuel Nordic Oy’s bio-oil production process consists of several parts that together form a functioning biorefinery. In the biorefinery, renewable wood-based raw material is converted into second-generation bio-oil.

The pyrolysis unit is at the core of the rapid pyrolysis-based biorefinery and is where the preprocessed biomass is converted into bio-oil. Bio-mass that has been preprocessed to the correct particle size and moisture content is fed into the reactor and then gasified by a circulating fluidized bed of hot material (sand). The gasification takes place in virtually oxygen-free conditions and thus no combustion occurs.

The gas that is generated is led to a cyclone, where the bed material and char are mechanically separated from the gas stream. The gas moves from the cyclone into a condenser, where it is cooled and condensed into bio-oil. Finally, the bio-oil produced is filtered before exiting the pyrolysis unit.

The char (biocoal) that is produced as a by-product returns from the cyclone to the boiler to heat the reactor’s bed material; this is where it is burned and generates the thermal energy required by the process. The product gas generated as a by-product in the condensing process is used in the drying of the biomass.

Before reaching the pyrolysis unit, the biomass is processed into the correct particle size and moisture content. Feedstock processing requires numerous screens and grinding equipment. Drying takes place in a drying drum that uses the thermal energy of the pyrolysis unit’s hot flue gases. After drying, the moist flue gas is led to the flue-gas scrubber, where the majority of the environmentally harmful substances are separated from the flue gas.

The filtered bio-oil produced in the pyrolysis unit is fed into day tanks and the quality is analyzed before being piped to storage tanks.

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