1. The fermentation process produces a large amount of […]
1. The fermentation process produces a large amount of organic matter such as protein, hop resin, polysaccharide, yeast, etc., and inorganic substances such as calcium oxalate and sulfate. After the fermenter is emptied, organic matter and inorganic matter adhere to the tank wall, which is yellowish brown. When the amount of tartar is large, the surface is white, and like the skin of saline-alkali, inorganic matter and organic matter are intertwined.
The use of caustic soda during cleaning only has an effect on the removal of organic matter, and the cleaning temperature reaches 80 ° C or higher, so that it has a good cleaning effect.
Cleaning with a single nitric acid, only a certain effect on inorganic substances, almost ineffective for organic matter. The fouling of the fermenter wall is a mixture of inorganic and organic materials, and it is difficult to clean with a single cleaning agent. Therefore, some breweries will carry out a large cleaning of the fermenter every year and thoroughly clean the fermenter.
2. The anti-corrosion layer of the fermenter wall T541 is partially damaged. After repairing, the surface finish is obviously reduced, which makes it difficult to clean the tank wall.
3. The wear or blockage of the washing tank or the washing ball leads to incomplete cleaning of some fermenters and accumulation of dirt. Due to the above factors, after a few years of use, the fermenter has accumulated a certain amount of dirt on the tank wall, which is difficult to completely remove using conventional cleaning processes. Therefore, every 4 to 5 years, the fermenter can be deeply cleaned in the off-season.