Citric acid vacuum disc dryer is an efficient conductive continuous drying equipment. Its structure and working principle determine that it has the characteristics of high thermal efficiency, low energy consumption, small footprint, simple configuration, convenient operation and control, and good operating environment. The cyclone dust collector necessary for spray drying is not required, and hot air is not used as the heating medium. Therefore, there will be no product loss caused by poor separation of hot air and dust with the tail gas. The disc continuous dryer is widely used for drying operations in industries such as chemical, pharmaceutical, pesticide, food, feed, and agricultural and sideline product processing.