EFFECTS OF ADDED MATERIALS ON BLACK LIQUORS COMBUSTION, 2015 PEERS Conference

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Black liquor is often mixed with various types of materials before being burned in a recovery boiler in order to meet specific needs of kraft pulp mills. A systematic study was conducted using a thermogravimetric combustor to examine how added materials may affect the combustion behaviour of black liquors obtained from several pulp mills. The results show that adding soap, caustic, white liquor and sawdust significantly reduces the liquor swelling tendency, thereby requiring a longer time for the liquor to burn completely. Adding makeup saltcake, precipitator ash, Na₂CO₃ and biosludge, on the other hand, has little or no effect on the liquor combustion behavior.


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