The Green Fuel Nordic bio-oil production process comprises multiple parts, working together to form a functioning bio-oil refinery. In the refinery, renewable wood-based material is turned into advanced bio-oil.
The heart of the bio-oil refinery focused around fast pyrolysis is the pyrolysis unit, where pre-treated biomass is turned into bio-oil. Biomass pre-treated to the correct particle size and moisture level is fed to the reactor together with hot (approximately 500 degrees Celsius) sand, causing the biomass to vaporise. Vaporisation occurs in nearly oxygen-free conditions to prevent combustion.
The resulting gas is directed into a cyclone, where sand and carbon residue are mechanically separated from the gas flow. The gas passes through the cyclone into a condenser, where it cools down and condenses into bio-oil. Finally, the resulting bio-oil is filtered before it exits the pyrolysis unit.
The energy for the production comes from carbon residuals from the vaporisation, separated with the circulating sand and burnt in the combustion chamber. Smoke gases generated in the burning process are directed through a steam boiler into a pipe equipped with a purifier. Heat energy for drying the raw material is obtained via process steam.
Before the pyrolysis unit, the biomass is processed into the required particle size and moisture volume. Received raw material is refined by removing impurities and screening. A belt dryer is used for the drying process, utilising the heat energy from the hot smoke gases generated by the pyrolysis unit.
The filtered bio-oil prepared by the pyrolysis unit is directed to a storage tank for quality assurance.
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