The tube bundle dryer is an indirect heating contact dryer, which can work according to both countercurrent and countercurrent principles. This machine has many advantages. The tube bundle dryer mainly has low energy consumption, a wide range of drying materials, high output, large water evaporation capacity, and can dry high moisture materials. It has high drying elasticity (can adjust the drying time according to different material moisture requirements), continuous production (i.e. high degree of automation), and intermittent production (suitable for special production processes). The materials are dried in a closed cavity under negative pressure. The bundle dryer can be widely used for drying loose materials (such as powder, granular, and flaky materials with low viscosity) in industries such as chemical, light industry, food, grain, and feed. Such as Baijiu tanks and beer tanks in light industry; Pork wool, bone meal (boneless), and pig blood fermentation powder in the meat industry; Granular and powdery fertilizers, as well as inorganic minerals and other materials in the chemical industry; Corn germ, corn fiber (corn residue), protein powder, etc. in the starch industry; There are also carriers for the feed industry, such as bran, corn kernels, soybean residue, etc; Fish and shrimp scraps in the fishing industry, as well as rapeseed (non seed) used in the oil industry.