Black liquor (BL), a by-product of the papermaking process, is an important liquid fuel in the pulp and paper industry. It consists of the remaining substances after the digestive process where the cellulose fibres have been cooked out from the wood. This report is aimed to provide a comparison of the recovery boiler with a pressurised gasifier for black liquor. Fundamentals concerning the conversion of black liquor, some details about the two recovery technologies and differences between these two will be presented.
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