Combustion of black liquor and processing of lime sludge in...

D - Textiles – Paper – 21 – C

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D21C 11/12 (2006.01) D21C 11/00 (2006.01) D21C 11/04 (2006.01) F23G 7/04 (2006.01)

Patent

CA 2164328

A method of modifying the course of combustion when evaporated black liquor is burnt in the furnace cavity of a recovery boiler is described. The method implies that lime sludge is supplied to the furnace cavity whereby the course of combustion is modified so that the temperature in the furnace cavity is raised. Also use of a recovery boiler for simultaneous combustion of black liquor and processing of lime sludge is described. In one embodiment of this use is disclosed that the processing of lime sludge is performed so that increased formation of calcium sulphide in the smelt of inorganic chemicals, which is formed in the recovery boiler, is obtained and/or so that the lime sludge is calcined.

L'invention concerne un procédé de modification du processus de combustion lorsque la liqueur noire évaporée est brûlée dans la cavité du four d'une chaudière de récupération. Le procédé consiste à envoyer les boues de caustification dans la cavité du four, le processus de combustion étant modifié de sorte que la température dans cette dernière augmente. L'invention porte également sur l'utilisation d'une chaudière de récupération pour la combustion simultanée de la liqueur noire et le traitement des boues de caustification. Dans un mode de réalisation, le traitement des boues résiduaires s'effectue de manière à augmenter la formation de sulfure de calcium dans le salin constitué de produits chimiques inorganiques formé dans la chaudière de récupération, et/ou à obtenir la calcination des boues résiduaires.

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