Fermentation tanks are widely used in industries such as beverages, chemicals, food, dairy products, seasoning, brewing, pharmaceuticals, etc., playing a fermentation role. The components of a fermentation tank include: the tank body is mainly used for cultivating and fermenting various bacterial bodies, with good sealing (to prevent bacterial contamination), and there is stirring slurry in the tank body, which is used for continuous stirring during the fermentation process; There is a aerated sparger at the bottom, which is used to introduce the air or oxygen required for bacterial growth. There is a control sensor on the top plate of the tank, and the most commonly used ones are pH electrodes and DO electrodes, which are used to monitor changes in the pH and DO of the fermentation broth during the fermentation process; The controller is used to display and control fermentation conditions. According to the equipment of the fermentation tank, it is divided into mechanical stirring ventilation fermentation tanks and non mechanical stirring ventilation fermentation tanks; According to the growth and metabolism needs of microorganisms, they can be divided into aerobic fermentation tanks and anaerobic fermentation tanks.