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Extra resources for Chemical Recovery in Pulp and Papermaking
Falling-film evaporator). g. g. combustion in a recovery boiler). Part of the black liquor in the recirculation system is returned directly to the retention vessel in order to facilitate mixing and thus to bring about, in the retention vessel, crystallisation of inorganic salts of the black liquor that is as complete as possible. Some of the discharged black liquor may also be returned, and a mixer and/or baffles disposed in the retention tank in order to enhance the mixing still further (Agren 1998).
1). 2 Source: reproduced from Vakkilainen (2000c), with permission from Fapet Oy, Finland Steam generation increases as black liquor dry solids content increases. For a rise in dry solids content from 65% to 80%, the main steam flow increases by about 7%. The increase is more than 2% for each 5% increase in dry solids.
The availability of the system was as high as 93% during the first 18 months of operation. The three-dimensional model was used by Karvinen et al. (1991) to investigate the effects of increasing the dry solids content of black liquor on its combustion in a recovery Page 32 © Copyright Pira International Ltd 2008 Chemical Recovery in Pulp and Papermaking Black liquor evaporation 2 boiler. It was found that increasing the solids content to more than 75% produced advantages over conventional firing.