Drying device and drying method

The invention discloses a drying device and a drying method, and relates to the technical field of drying equipment. The drying device comprises a drying system and a steam recovery system, the drying system comprises a drying machine and a steam generator, the drying machine comprises a drying chamber and a dryer arranged in the drying chamber, a feeding port and a tail gas outlet are formed in the top of the drying chamber, a discharging port, a steam convection drying air inlet and an air outlet are formed in the bottom of the drying chamber, the steam convection drying air inlet and the dryer both communicate with the steam generator, and the steam recovery system comprises a separation buffer tank. The separation buffer tank is used for separating water and steam, the tail gas outlet communicates with an air inlet of the separation buffer tank, and an air outlet of the separation buffer tank respectively communicates with the steam convection drying air inlet and the dryer. The problem that the heat exch