Based on the investigation of drying of seeds by one-pass infrared radiation vibration, the present study developed a two-pass infrared radiation vibrated dryer. One of its characteristics was that during the drying process both seeds and the inlet hot air went through outer and inner cylinders (two-pass) so that the drying travel distance of seeds was extended by 20%. Unsteady drying dynamic experiments showed that by increasing the inner travel distance, the seed dehydration rate increased by 87%, the total drying period was 1/1.8 times that of the one-pass dryer, and the seed temperature was 0.82 times that of the one-pass dryer. With the constant-drying-rate period prolonged and the drying rate increased due to the addition of the inner cylinder, the whole drying process was better adaptable to the physiology and biology of seeds and thus kept the seeds viable and enhanced heat and mass transfer. Against the drying rate equation, the paper experimentally studied the effects of radiation, convection, and conduction on the seed drying process. The study provided theoretical and technical bases for the drying of various vegetable seeds.

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