New wort boiling system combined withthermal-VRC vacuum evaporator in SuntoryKyushu-Kumamoto Brewery

摘要

For the construction of the new Suntory Kyushu-Kumamoto Brewery in July 2003, werndesigned a new wort boiling system to achieve lower thermal and shear stress on the wort,rnfurther energy savings and easier maintenance. It has an internal heater with a very largernheating surface to reduce the heating steam pressure and temperature, and this lower steamrnpressure enabled the combination of thermal VRC and an internal heater in an industrial scalernbrewhouse. Furthermore, by using a Vacuum Evaporator after whirlpool, total evaporation inrnthe boiling process could be reduced free from the insufficient evaporation of undesirablernvolatile compounds like DMS in cold wort. This gentle and simple boiling system workedrnwell with recycling ca. 50 % of vapors arising in the wort kettle, and the actual resultsrnindicated the possibility of achieving good flavor stability and foam quality by reducing thernthermal stress on the wort.