Detailed introduction
　　Solid fermentation tank is corresponding to liquid fermentation tank. Solid fermentation means that the fermentation medium is solid, and the completion of fermentation is also a solid fermentation process. Therefore, the solid fermentation tank is a tank which provides occasions and conditions for the completion of solid fermentation. Solid fermentation requires a certain degree of humidity and uniformity, so humidity control and the setting of stirring system are the key control of solid fermentation. Solid fermentation has the advantages of simple operation, low energy consumption, easy control of fermentation process, relatively low requirements for sterility, and not easy to produce large-scale pollution. After pre-processing of solid fermenter raw materials, such as cooking and sterilization, the solid materials containing certain moisture were made, and the pre-cultured strains were added to ferment. Fermentation ripening, timely discharging, and appropriate treatment, or extraction of products. The extraction process is simple and controllable.
　　Solid fermentation tank can be divided into vertical fermentation tank and horizontal fermentation tank. Whether vertical fermentation tank or horizontal fermentation tank is used in practice needs to be determined according to the specific state of culture medium. Solid fermentation tank can ensure the temperature needed for fermentation, through the jacket for constant temperature control. It can be sterilized either in the tank or in the fermentation tank after sterilization. Humidity is generally monitored by a humidity controller. Through sterile water spraying (fog) device and water evaporation device, 0-100% humidity sensor device can be arbitrarily adjusted, maintained constant humidity and displayed in its humidity range. Ventilation control is also a main control point of solid fermenter. The requirement of ventilation is sterility, and the air volume and speed can be adjusted. The setting of stirring system is a key control point of solid fermenter. Because inoculation of solid fermentation requires uniformity and is not easy to mix, the design of stirring must ensure uniformity of material mixing and even distribution of bacteria after inoculation. Generally, the inoculation is carried out by spraying. The stirring forms are mechanical stirring, tank and mechanical stirring synchronization. The stirring adopts up-direct mechanical or horizontal rotating shaft stirring, the kettle is mechanically sealed, various types of high-performance agitator, defoaming propeller, AC speed regulating motor, and the speed can be adjusted endlessly. Glass window, easy to observe the state of the tank. Various process interfaces, including temperature and humidity interface, aseptic sampling port, special large discharge port, liquid strain inoculation port, feed port, pressure gauge port, intake port, exhaust port, jacket upper and lower ports, etc.