In addition to producing a large amount of beer grains during the beer brewing process in a brewery, some waste beer yeasts are also produced. These waste yeasts contain a large amount of nutrients and can be reused after treatment. So how to deal with the waste yeast in the brewery?
How to deal with spent yeast in breweries?
At present, the commonly used method for processing waste yeast in breweries is mechanical drying, which uses heat exchange to quickly reduce the yeast moisture to about 12 parts of water, which is convenient for long-term storage of yeast or feed processing. Its process principle: its drying cylinder (drum) is a metal hollow cylinder with a processed outer surface and extremely smooth surface. Driven by the transmission device (large and small gear transmission), the drying cylinder rotates around the axis and the speed can be adjusted. The slurry is preheated in the preheating tank to about 50°C, and is fed into the immersion tank at the bottom of the drying cylinder with a feed pump. The drying cylinder is immersed about 60-80mm, and the outer surface of the rotating drying cylinder is coated with a coating. To create a uniform layer of slurry (i.e. film thickness), the steam pressure introduced into the drying cylinder is 0.15-0.3Mpa. The slurry is heated on the outer wall of the drying cylinder, and the moisture is vaporized and discharged by the axial flow fan. The drying cylinder rotates once, the material is dried, and the flaked material is discharged by the scraper on the outer wall of the drying cylinder.
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