Apparatus and method for treatment of loose material

D - Textiles – Paper – 21 – C

Patent

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D21C 1/02 (2006.01) D21C 7/06 (2006.01) D21C 7/14 (2006.01)

Patent

CA 2431555

A pre-treatment device for wood chips for pulping comprises a tube through which the wood chips fall into a digester. Steam is injected into the tube through rings of nozzles, which are angled circumferentially to impart a rotary and turbulent motion to the falling chips. Some nozzles are angled downwardly to encourage the chips to flow freely through the tube, some are horizontal to encourage a longer dwell time near the nozzles. Digesting liquor is also sprayed onto the chips from spray nozzles after the first ring of steam nozzles. The heat and steam expel air and other non-condensable gases and volatiles from the chips, allowing them to absorb the liquor. At the bottom of the tube, the chips are propelled down and outwards by jets of higher-pressure steam, spreading and packing them into the digester.

L'invention concerne un dispositif de prétraitement de copeaux de bois, pour réduction en pâte à papier, comprenant un tube à travers lequel les copeaux tombent dans un lessiveur. De la vapeur est injectée dans le tube via des anneaux de buses orientées selon la circonférence afin de communiquer un mouvement turbulent et de rotation aux copeaux en chute. Certaines buses sont orientées vers le bas afin de forcer les copeaux à s'écouler librement à travers le tube, d'autres étant en position horizontale afin de favoriser un temps de séjour plus long près des buses. De la liqueur de cuisson est aussi pulvérisée sur les copeaux à partir de buses disposées après le premier anneau de buses de vapeur. La chaleur et la vapeur provoquent l'expulsion de l'air et d'autres gaz non condensables provenant des copeaux, leur permettant ainsi d'absorber la liqueur. A l'extrémité inférieure du tube, les copeaux sont propulsés dans un mouvement vers le bas et vers l'extérieur au moyen de jets de vapeur de pression plus élevée, ce qui produit leur étalement et leur entassement dans le lessiveur.

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