The main reasons why spent yeast needs to be dried are as follows:

1. Convenient storage and transportation: The volume of dried waste yeast is reduced, making it easier to store and transport, reducing transportation costs.

2. Prevent fermentation and deterioration: Drying can remove most of the water in spent yeast, effectively preventing it from fermenting or deteriorating again during storage.

3. Facilitate subsequent processing: The dried waste yeast can be more easily crushed, screened and other subsequent processing, which provides convenience for subsequent use.

The scraper type double drum dryer is a commonly used drying equipment used to dry wet materials. During the drying process of waste yeast, the heating device in the drum heats the waste yeast evenly. At the same time, through the scraping effect of the scraper, the waste yeast is fully contacted with the heating medium to achieve efficient drying.