| 摘要 |
<p>The invention concerns a method and an arrangement for improved impregnation of chips in association with the manufacture of chemical cellulose pulp. Unsteamed chips are fed into an impregnation vessel (30) in which a fluid level (LIQ&lowbar;LEV) is established under the highest level (CH&lowbar;LEV) of the chips. An improved impregnation arrangement for the chips is obtained by the addition of impregnation fluids (BL1/BL2/BL3) with increasing temperatures at different heights (P1, P2, P3), and by the establishment of a counterflow zone (Z1) in the uppermost part of the impregnation vessel. The requirement for steaming can in this way be dramatically reduced while at the same time the amount of expelled waste gases can be minimised. A major part of the volatile compounds present in the wood are bound to the impregnation fluid (REC) that is withdrawn.</p> |
