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US 2006/0231222 A1Published application
Method and apparatus to decrease steam consumption in conventional batch digesters
OwnerCraig Bianchiniinventor
Life of this patent
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Abstract
Method and apparatus for conventional batch digesters to retain thermal energy typically lost in the flashing blow operation by transferring the thermal energy to fresh cooking liquors from hot spent cooking liquor.
Claims7
In a process for producing pulp using at least two batch digesters the improvement comprising:
- removing hot spent cooking liquor from a first digester;
- passing said hot spent cooking liquor in heat exchanger with a supply of fresh cooking liquor to be supplied to a second digester thereby heating said fresh cooking liquor.
A system for producing pulp from lignocellulosic material comprising in combination:
- at least two batch digesters each digester having means to introduce lignocellulosic material and cooking liquor into each of digesters, means to re-circulate cooking liquor with intermediate heating as required, and means to withdraw cooked pulp from said digesters;
- and
- heat exchange means to use spent cooking liquor from one digester at the end of a cooking cycle to pre-heat fresh cooking liquor prior to introduction into said other digester at the beginning of a cooking cycle.
Dependencies are inferred from the claim text.