CONTINUOUS DIGESTER WITH IMPROVED HEATING CIRCULATION

摘要

The present invention concerns an improvement of the heating circulation in a continuous digester for the production of cellulose pulp. The heating circulation withdraws treatment liquor from the vessel via a strainer section 61 arranged in the wall of the digester and after passing the withdrawn treatment liquor trough a heating device 40 is the heated treatment liquor added into the centre of the vessel via a central pipe 21a. According to the inventive arrangement and method is a part flow of the heated treatment liquor also added via nozzles arranged in the wall of the vessel close to the strainer section 61. A more uniform heating over the entire cross section of the vessel is thus possible in especially overloaded digesters.