The present invention not only can be achieved independent of the hot-air drying, a combination of hot air drying and radiation drying organically, it is possible to fully utilize the energy of the high-temperature heat medium in the high-grade and low-grade, thermal efficiency high energy consumption is small, the drying is sufficient and uniform drying cost is low, the temperature is uniform and provides a circulation type grain dryer which is excellent in safety A radiation drying unit 2, which is provided in order from the bottom to the top to the base 1, grain discharge section 4, including a hot-air drying unit 7, and the grain storage part 8-10, radiation drying section and a grain storage unit material circulating transport device is arranged between the radiation drying section heat source 3 that can generate heat medium at one side of communicated, the suction fan 6 and wind the mixing chamber 14 respectively provided on both sides of the hot air drying unit, entrance of wind mixing chamber is communicated with the heat medium exit of radiation drying section, the exit of the wind mixing chamber is passed through the suction fan and the other by a hot air drying sectionFIELD 1【課題】熱風乾燥を独立して達成できるだけでなく、熱風乾燥及び放射乾燥を有機的に組み合わせ、高温熱媒のエネルギーを高品位及び低品位において十分に利用することができ、熱効率が高く、エネルギー消費量が小さく、乾燥が十分で均一であり、乾燥コストが低く、温度が均一で、安全性に優れる循環型穀物乾燥機を提供する。【解決手段】台座1に下から上へ順に設けられた放射乾燥部2、穀物排出部4、熱風乾燥部7及び穀物貯蔵部8~10を含み、放射乾燥部と穀物貯蔵部との間に材料循環搬送装置が設けられ、放射乾燥部の一側に熱媒を生成可能な熱源3が連通され、熱風乾燥部の両側にそれぞれ吸込ファン6及び風混合室14が設けられ、風混合室の入り口が放射乾燥部の熱媒出口と連通され、風混合室の出口が熱風乾燥部によって吸込ファンと連通される。【選択図】図1
