| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for continuously cooking, increasing heat economy and obtaining high quality pulp. SOLUTION: The method of continuous cooking of chemical pulp comprises a impregnation vessel 101 and a digester 102. Chips are impregnated in the impregnation vessel 101 and are fed after impregnation together with circulation fluid through a transfer line 103 to a top separator 105 on the digester 102 in order to be cooked. A fraction of the circulation fluid is withdrawn at the top separator 105 and returned to the bottom of the impregnation vessel 101 via a return line 106. Black liquor is withdrawn from the digester via a black liquor line 108 to the impregnation vessel 101. A heat exchanger 107 is arranged between the return line 106 and the black liquor line 108. The heat exchanger 107 allows heat exchange between the two lines, but does not allow fluid exchange. The temperature of the black liquor in the black liquor line 108 after passing through the heat exchanger 107 is cooled by 10-15°C. COPYRIGHT: (C)2005,JPO&NCIPI
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