Wort boiling today - are there alternatives?
Wort boiling on average accounts for 33 - 50% of total heat requirements in a brewery. Large energy quantities (about 55% primary energy) can be saved by adopting measures such as reducing total evaporation and using heat recovery. This is state-of-the-art.
The various boiling systems operated under atmospheric pressure or a slight overpressure, including heat recovery procedures, are meantime technologically mature. Using current practices, these concepts result in gentle boiling (coagulable nitrogen, foam), low DMS level in pitched wort, low thermal stress (TBI) and further reduction in total evaporation (energy saving). The objectives of wort boiling are well known.Altogether, this already evaporates about 1.5%. This is followed by evaporation using stripping (1%) in a column..
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