The principle of beer fermentation

Beer brewing includes several steps such as raw material crushing - saccharification - filtration - cooling - fermentation, among which fermentation is the key step in brewing beer, and fermentation is one of the very important factors affecting the taste of beer. How to ferment, let you have a clearer understanding of the whole process of brewing beer raw materials into beer.

1. Yeast breeding period: 8-16 hours after adding yeast to the wort, small carbon dioxide bubbles appear on the liquid surface, and gradually form white, creamy foam, and the yeast enters the main fermentation tank immediately after 20 hours of breeding.

2. Foaming period: After 4-5 hours of returning to the wort, more foam gradually appeared on the surface of the wort, from the surrounding to the middle, white and delicate, thick and tight, like a cauliflower, with small carbon dioxide bubbles rising up, and Brings out some precipitates.

DEGONG 1000L fermentation tanks

3. High-foaming period: 2-3 days after fermentation, the foam increases to form a bulge, and gradually turns brown due to the precipitation of hop resin and protein-tannin complex in the wine. This is the vigorous fermentation period, which requires artificial Cool down, but not too violently, so as to avoid premature precipitation of yeast and affect fermentation.

4. Foaming period: After 5 days of fermentation, the fermentation power gradually weakened, the carbon dioxide bubbles decreased, the foam retracted, the precipitates in the wine increased, and the foam turned brown.

5. Foam cover formation period: After 7-8 days of fermentation, the foam shrinks to form a bubble cover, and the precipitated polyphenol compounds, hop resin, yeast cells and other impurities are skimmed off. At this time, the temperature should be greatly reduced to make the yeast precipitate. .

DEGONG 500L beer brewery equipment

6. Post-fermentation and storage: The fermentation liquid after the main fermentation of the wort is called tender beer. At this time, the carbon dioxide content of the wine is insufficient, and the volatile substances such as diacetyl, acetaldehyde, and hydrogen sulfide are not reduced to a reasonable level. The mouth dares to be immature and not suitable for drinking. A large amount of suspended yeast and coagulated substances have not yet settled, and the wine is not clear enough. Generally, it will take several weeks for post-fermentation and wine storage. The maturity and clarification of beer are in the post-fermentation and wine storage period.

After these several periods of fermentation, the wort can be turned into a craft beer with rich taste and dense foam. Today's sharing of Maid's home brewing equipment is here. I hope it will be helpful to you. Do you have any suggestions? Or you can leave a message to DEGONG equipment if you have any doubts.