在深入研究单行程红外辐射振动流化种子干燥的基础上,该文开拓出双行程振动流化干燥,其特点是在干燥过程中种子与供热热风均经两次行程,干燥装置总高度不变,其干燥行程增加20％.通过非稳态干燥动力学实验研究表明,增加内行程种子总脱水率增加87％,总干燥周期为单行程的1/1.8,料温为其0.82(47℃/57℃)倍.由于增加内筒使恒速段延长并提高了梅这段的干燥速率,整个干燥过程适应种子的生理生化特性,因而可保持种子的活力.文中根据干燥速率方程分别实验研究了辐射、对流与导热在强化种子传热传质过程中的各自贡献.这些研究为我国的''种子工程''尤其是品种繁多、特性各异干燥难度较高的蔬菜种子干燥提供了理论依据与技术基础.“,”Based on the deeply investigation of infrared Radiation One-pas Vibrofluidized Seeds Drying, this paper developed a new type of infrared Radiation Two-pas Vibrofluidized dryer. Its characteristic was that during the drying process both the seeds and the inlet hot air went through the outer cylinder and inner cylinder (two-pas), so that seeds drying travel extended 20%. Mom the unsteady drying dynamics experimental study, it showed that by the adding of inner travel, the seeds' dehydrating rate increased 87%, the total drying period was 1/1.8 of the One-pas dryer, and the seeds' temperature was the 0.82(47℃/57℃) of the one-pas dryer. In this case the constant-drying-speed period prolonged and its drying rate rose, because of the adding of the inner cylinder. Thus it made the whole drying process more adaptable to the physiology and biology characteristics of seeds and as a result it could keep the seeds' activity meanwhile enhancing heat and mass transfer. According to the drying rate equation, the paper studied experimentally the respective contribution of radiation, convection and conduction during the process of enhancing seeds' drying. These studies provided theoretical and technical basis for the drying of vegetable seeds that were hard to dry and had various varieties, different characteristics.