Zero-gas-consumption waste heat regeneration dryer

The utility model discloses a zero-gas-consumption waste heat regeneration dryer which comprises a compressed gas source, a gas-water separator, a drying tower A and a drying tower B. The drying tower A and the drying tower B are arranged in parallel, the two ends of the drying tower A and the drying tower B are respectively connected with three groups of pipelines in parallel, and a compressed air recovery system is connected between two valves of the third group of pipelines on the outlet end side. The compressed air recovery system comprises a fourth pipeline communicated with the two valves of the third group of pipelines, the fourth pipeline is communicated with the third pipeline, the two ends of the fourth pipeline are respectively provided with a one-way valve, the fourth pipeline is further provided with an air ejector, and the inlet end of the air ejector is connected with the guide instrument air system through a fifth pipeline. According to the medium-pressure emergency instrument air system based