| 摘要 |
A method for bringing a digester up to cooking temperature efficiently and rapidly wherein wood chips are packed in the digester, covered with a hot spent liquor, and then a hot liquor displacing liquid is used to displace the hot spent liquor from the digester and send it to an alkali adjustment zone in an accumulator. After the hot spent liquor has been displaced, the hot liquor displacing liquid is passed through the digester and into a lower portion of the alkali adjustment zone. Hot liquor is constantly passed from a constant volume heating zone into the alkali adjustment zone by overflow or otherwise. Hot liquor at the cooking temperature is passed from the top of the heating zone into the bottom of the digester and relatively cool liquor after passage through the digester passes from the top of the digester to the bottom of the heating zone. This type of circulation is continued until liquor leaving the top of the digester is at the cooking temperature whereupon the circulation is terminated and the heat content of the liquor in the heating section is increased by passage through a separate heat exchanger.
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