Rudolf Michel, GEA Brewery Systems GmbH, Kitzingen,
Germany
Hops
Friday, October 13
3:45–5:00 p.m.
Imperial Salon B
The paper gives an overview on the available techniques for processing hops in a brewhouse as well as in the cold block of a brewery including options for the craft brewers. For traditional brewhouses, a method is shown to reduce extract losses with pellet dosings above 200 g/hL. In a brewhouse there are special skid-mounted units for hop pre-isomerization available besides the typical hop dosing units for pellets and extract. The working principle of the pre-isomerization is explained with results from industrial trials in Europa and Asia. The isomerization is done in parallel to the wort boiling operation; this allows the reduction of boiling parameters to the needs of DMS transformation and the stripping process. For dry hopping, a new extraction unit was tested in an industrial environment. The process steps and the behavior of hop oil fractions are explained and discussed with first results. The overview also presents a method for continuous pellet dosing in large volume tanks.
Rudolf Michel finalized an apprenticeship as brewer and maltster and studied at the Technical University of Munich at Weihenstephan. Here he graduated as engineer and earned his Ph.D. degree. He worked with Professor Karl Sommer for several years on the mechanisms of hot break separation and on hygienic design of armatures and pipework systems. After different positions, he joined Huppmann in June 2000 and being involved in major brewhouse projects. After a takeover by GEA in 2006 the new entity GEA Brewery Systems was created in 2009. Currently he is leading the research and development team focusing on brewing technology and environmental aspects. He is a member of DBMB and VeW and has published more than 100 papers.
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