Lo-Solids® Cooking is a patented process which makes use of distributed white liquor addition (even alkali profile), clean filtrate addition, and multiple extraction points to create a “cleaner, lower solids cooking environment.
The Andritz Lo-Solids® cooking solution achieves high pulp strength and optimal properties for bleaching. The Lo-Solids® digester provides high cooking capacity and washing efficiency with minimal chemical consumption and low reject amounts. Significant cooking yield improvements have been measured on hardwood Lo-Solids® Cooking references.
Virtually every style and size of digester, whether vapor phase or hydraulic, can be retrofitted to Lo-Solids® Cooking. Return on investment for most digester retrofits can be achieved in one to two years of operation.
Over the years, the most common type of Lo-Solids® digester supplied by Andritz has been the single-vessel hydraulic digester. Having a hydraulically full vessel removes the need to control liquor level, making this type of digester is simple to operate. As an alternative, the Andritz two-vessel system utilizes an Impregnation Vessel before the Cooking Vessel to allow time for the cooking liquor to impregnate the chips. The transfer circulation between the vessels helps to uniform conditions prior to cooking. In some cases, the two-vessel approach can reduce the amount of necessary cooking circulations within the Cooking Vessel.
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