Vapour phase digester and a method for continuous cooking
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United States of America Patent
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Jun 12, 2012
Grant Date -
Dec 30, 2010
app pub date -
Feb 19, 2008
filing date -
Feb 23, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
The system and method reduce the liquid/wood ratio at the top of a vapor phase digester in a continuous digester plant. Chips that are to be cooked in the vapor phase digester are fed as a mixture of chips and liquid at a liquid/wood ratio that exceeds 8:1 in a transfer line to an inverted top separator arranged at the top of the vapor phase digester. The top separator feeds the chips upwardly. More than 50% of the liquid content of the mixture of chips and liquid is withdrawn in the top separator and the remaining liquid is fed out from the top separator to the top of the vapor phase digester. A pile of chips and a liquid volume are established at the top, wherein the pile of chips is disposed above the liquid surface of the liquid volume.
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