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10 months ago

MDA Technologies 2/2014

MDA Technologies 2/2014

Drive

Drive Technologies Powerful drives for Italy’s only private brewery The brewery Forst commissioned leading German companies to construct five large vats, complete with brewing technology and piping systems, a newly designed water supply, a malting plant with twelve silos, and three separate storage vats. Nord Drivesystems custom-tailored all necessary drive units. With a 156 year tradition, Forst (Algund, South Tirol) is a well-renowned name in beer brewing in Italy. The new brew house is located at the perimeter of the extensive brewery premises and can easily be seen from the road passing by. It is a landmark with its distinctive 4,800 m² glass façade. Up to twelve brews per day can be produced here, each with a volume of 630 hectoliters. The annual production capacity is 900,000 hl. Trouble-free transition to the new facilities The engineers and technicians had just 16 months to construct the main components from scratch. “The tight schedule was the greatest challenge with such a complex and technically sophisticated plant”, says Werner Würth, Development Engineer at Ziemann International GmbH. The general contractor specializing in breweries was responsible for the planning and construction of the brewing equipment. The five brewing vessels and the machinery were manufactured in the Ziemann factory in Bürgstadt/Main from where they travelled the 550 km to South Tirol on trucks. During construction the actual brewing process had to continue as usual. Even the transition to the new plant had to take place without any interruption to production. Each drive unit tailored to its task Nord Drivesystems (Germany) assembled the geared motors for all the vessels according to the specific requirements of the various applications, from the grinding mill, which gently grinds the malt at the start of the brewing process, to the screw conveyor removing the spent grain. In the first stage of the process the malt is mixed with spring water from the nearby mountains in the mash tuns. The mixture is then heated to various temperatures by means of thermally optimized conducting surfaces at the bottom and the frames of the mash tun. A frequency-controlled Nord helical bevel gear motor, equipped with a temperature 26 MDA Technologies 2/2014

Drive Technologies 01 A helical bevel gear motor powering the mash tun sensor, drives the agitator inside the vessel. Subsequently, the liquid is pumped into the lauter tun. Smooth lauter speed adjustment Measuring 8.6 m in diameter and weighing close to 21.5 t, the lauter tun is the heart of the brew house. The liquid and solid parts of the mash are separated in a fully automated process. As the spent grain settles on the floor of the vat, it forms a natural filter layer. A special raking machine loosens this layer in order to ensure an optimum flow of the beer wort. Thus, the wort quality improves and raw materials are used efficiently. Pressure sensors at the bottom of the vessel detect the spent grain’s consistency, and the drive adjusts the machine’s speed accordingly. “This intelligent control system enables flow rates between 9 and 14 liters per minute and square meter”, says Würth. Next, the spent grain is removed: the machine is gradually lowered and the flat bars mounted on its six arms push the spent grain out of the tun through a hatch. This 02 A parallel shaft gear unit drives the screw conveyor removing the spent grain 03 A single drive unit actuates the lautering process, both loosening the spent grain and clearing out the tun MDA Technologies 2/2014 27

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