Process for heating up wood chips prior to steaming and pulping

Details Process for heating up wood chips prior to steaming and pulping Process for heating up wood chips prior to steaming and pulping

D - Textiles, Paper

21

C

92/52

D21C 1/02 (2006.01) D21B 1/02 (2006.01) D21C 1/00 (2006.01)

Patent

CA 1169285

ABSTRACT A process is provided for heating up wood chips in one or more stages at progressively higher temperatures prior to steaming and pulping in an economical manner at a considerable cost saving; heating the chips in at least a first preheating stage directly with moisture-saturated hot air, optionally admixed with inert gas, having a temperature within the range from about 55 to about 99°C, preferably from 70 to 90°C, having been brought to that temperature in a heat exchanger with hot water or air heaters with waste gases, such as gases drawn at different levels from an evaporator, for example, a multiflash pre-evaporator column.

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