A 50-ton/batch electric grain circulation drying system was designed that adopted clean electric energy as a drying heat source. The exhaust gas of the dryer was recycled after condensation and dehumidification. The drying system has the advantages of energy saving and environmental protection. The corn drying test showed that the specific heat consumption was 3185 kJ/kg H2O in close operating mode, compared to the Chinese standard of 5700 kJ/kg H2O, and the energy consumption ratio was 44%. This research pioneers a way of saving energy and protecting the environment from drying and comes up with a new thought on how to utilize the waste heat from exhaust gas and the latent heat released by the evaporation of water vapor reasonably.
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