Studies on development of drying system using the far-infrared heater for agricultural products

本课题研究了利用远红外加热器对农产品进行干燥的干燥系统。这项研究是日本最有趣的研究课题。这项发展科学研究历时三年完成。对远红外加热干燥设备进行了试制，建立了利用远红外加热干燥设备对大米、红薯、香菇、紫菜进行干燥的方法。在红薯加热实验中，供试物料的表面和内部温度均高于干燥室内的空气温度。这一事实被认为是远红外干燥的特殊特点。粗米干燥1 h最大含水率为17.7%/h。甘薯以20%的含水率干燥6-9小时。采用远红外加热器对香菇进行干燥，模仿了传统的加热空气干燥方法，远红外干燥时间比加热空气干燥时间短。在香菇干燥中，远红外干燥是一种有效的干燥方法。本研究为紫菜的干燥提供了一种基于远红外加热器的干燥方法，是一种有效的方法。

This research studies on the drying system using the far-infrared heater and drying of agricultural products. This study is the most interesting research subject in Japan.This developmental scientific research was accomplished for three years. There were to make the trial manufacture of drying equipment with far-infrared heater and to establish the drying method for rough rices, sweet potatoes, SHIITAKE mushrooms and lavers using the drying equipment with far-infrared heater.In heating experiment of sweet potatoes, surface and inside temperatures of supplied materials were higher than the air temperatures inside drying room. This fact was considered a special characteristics of far-infrared drying.Maximum reduse ratio of moisture content per one hour for rough rice drying was 17.7%/h. Sweet potoes were dried the moisture content of 20% for 6-9 hours. SHIITAKE mushrooms drying by far-infrared heater were done a method which imitated the tradisional drying method by heating air, and the period of drying by far-infrared was shorter than the drying by heating air. In SHIITAKE mushroom drying, far-infrared drying was an effective drying method. For laver drying, a method according to use far-infrared heater could be established by this research, and was an effective method.