Attention : the quality of coal obtained at 400°C is not optimal (65% pure carbon). A temperature of 500°C allows for better quality production of coal (around 85% of pure carbon). Therefore, the combustion of a part of the created coal is needed as an energy supply to raise the temperature to 500. The difficulty of carbonisation is therefore controlling the inflow of oxygen to ensure that the combustion of coal is kept as minimal as possible for the production of good quality coal.
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