Paper Pulp Processing

To produce paper, the pulp wood is placed in a digester to dissolve the cellulose and produce wood fibers. The by-product of this process, black liquor, is sprayed into a recovery boiler and burned, producing green liquor in a bed combustion unit, where the temperature has to be maintained at approximately 1037°C (1900°F) to keep it burning. If the liquor is too wet, it will cause a “black-out” condition. If there is a lack of combustible material, then a starving condition occurs.