Packaging

Controlled aromatics evaporation with Boreas

Wednesday 17. November 2010 - Krones AG's, Steinecker plant is showcasing a new solution in the brewing process, called Boreas, for controlled evaporation of unwanted aromatics from the hot wort.

The salient features of this process are its small space requirement, its easy retrofittability, and a mode of operation that does not need a vacuum or any additional thermal energy. Instead, Boreas utilises a very large evaporation surface, created in an external stripping vessel featuring an innovative wort inflow configuration. The evaporation rates can be regulated using temperature-controlled stripping gas injection. The reduction in unwanted aromatics can thus, for example, be maintained at a consistently high level independently of the wort’s inlet temperature. Depending on the starting level involved, Boreas can achieve DMS reduction rates of up to 70 per cent.

The newly developed Boreas wort stripping sysem requires no additional energy whatever in the form of heat or vacuum generation in order to function effectively. Thanks to the short dwell time of the hot wort, there is no measurable energy loss from radiation at the tank either. In contrast to stripping with vacuum, moreover, no water is consumed for the vacuum pump, and the systems do not have to withstand vacuum pressures in terms of mechanical strength and leakproofing.
Thanks to its evaporation efficiency (which can be precisely controlled using the stripping gas’s volume flow), its minimised footprint, and its stand-alone construction, the Boreas wort stripping system offers for mid-tier and large breweries alike an attractive system technology that can be easily integrated into any brewhouse. Nor are there any problems in having several brewing lines served by one system alternately, since it requires no intermediate cleaning procedures or additional manipulation times, with their concomitant interruptions in the production flow.