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Effect of Variability on the ffermal Efficiency of a Kraft Mill Evaporation Unit


April 1, 2010
By Pulp & Paper Canada

L’effet de la variabilit sur l’efficacit thermique de l’unit d’vaporation dans une usine de pte kraft

L’effet de la variabilit sur l’efficacit thermique de l’unit d’vaporation dans une usine de pte kraft

Abstract: The effect of variability on the black liquor evaporation unit thermal efficiency was studied. The multiple effect evaporators thermal efficiency was low during the summer because of lack of steam flow adjustment coupled with large variability. This was attributed to periodic operation of the High-Solids-Concentrator and fast dynamic variations caused by inadequate unit control of the black liquor outlet flow. It was estimated that approximately 12% steam could be saved through proper control of heat balance and stabilization of the black liquor outlet flow.

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Paper presented at the PAPTAC 95th Annual Meeting in Montreal, Que., February 3-4, 2009.

Keywords: BLACK LIQUOR EVAPORATION, MULTIff PLE EFFECT EVAPORATORS, THERMAL EFFICIENff CY, VARIABILITY

Full manuscript available at www.paptac.ca.


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