Kraft Pulping Warm and Hot Water System Strategies, 2018 PEERS



Kraft pulp mills utilize both warm (110 to 130°F) and hot water (160 to 180°F) depending on the process.  The primary source of warm water is evaporator surface condenser cooling return water.  Warm water temperature can then be increased to desired levels for process use by integration with various pulp mill secondary heat sources (cooling loads).  Depending on the mill configuration, these heat sources can include batch digester blow heat recovery systems, turpentine recovery systems, continuous digester cold blow coolers, and washer filtrate coolers.  The blow heat recovery and turpentine recovery systems include primary, secondary, and sometimes tertiary condensers.  Each of these condensers lends themselves to particular heat loads and temperature ranges for producing either warm or hot water.  End users of heated water include bleach plant washer showers, brownstock decker and/or washer showers, dilution water makeup, causticizing area hot water needs, white water makeup, and paper machine cleaning showers.  The intent of this paper is to review warm and hot water system strategies that optimize energy and water conservation. 

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Author: James Cantrell
Kraft Pulping Warm and Hot Water System Strategies, 2018 PEE
Kraft Pulping Warm and Hot Water System Strategies, 2018 PEERS
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