Apparatus and methods for reducing the formation of scale in...

Details Apparatus and methods for reducing the formation of scale in... Apparatus and methods for reducing the formation of scale in...

D - Textiles, Paper

21

C

9/2, 92/56

D21C 3/22 (2006.01) D21C 7/00 (2006.01)

Patent

CA 1299322

23 APPARATUS AND METHODS FOR REDUCING THE FORMATION OF SCALE IN PULPING OPERATIONS ABSTRACT OF THE DISCLOSURE A retention vessel for the liquor heated by the lower heat exchanger in a continuous digester is provided. The lower heat exchanger heats the liquor to a temperature above which the calcium in solution precipitates. The liquor is retained in the retention vessel for a predetermined time sufficient for the calcium to either deposit as scale on the surfaces of the vessel or to flow through the system with the chips. In this manner, the scale-forming constituents of the liquor are reduced and a scale-forming constituent lean liquor is returned to the digester, whereby the tendency of the liquor to form scale on the component parts of the pulping system is minimized.

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