The drying blower blows the dehumidified air to the drying electric heat for heating and then sends it to material tank to be the power source for dehumidifying air in the drying circuit. The circulating blower sends the air to the regenerated electric heat for heating and then blows it to the honeycomb rotor to get the moisture absorbed by the honeycomb rotor evaporated, which will make the honeycomb rotor capable of moisture absorption again.