Digester Heating Systems: Heat Exchangers
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Walker Process heat exchangers are concentric tube counterflow type, that are proven to be the most efficient design available.
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Walker Process sludge-to-sludge heat exchangers are concentric tube counterflow type that are the same as water-to-sludge heat exchangers but with a larger annular area between tubes. Sludge-to-Sludge heat exchangers are used with almost any temperature phased anaerobic digestion system.