关键词: 油菜籽, 太阳能, 热风, 循环, 含水率, 干燥效率

Abstract: In order to further meet the requirements of low energy consumption and high efficiency in rapeseed drying process, this paper designed a small rapeseed circulating and drying machine by solar hot air. Its device relied on solar collector to provide hot air. The drying chamber provided a pair of screen impeller turning in the opposite direction. The rotating impeller could extend the rapeseed retention time on air, and the bucket elevator could make rapeseed move circularly in the drying device. Rapeseed was tested as a drying object to find out the changes in moisture content, hot air wind speed from the drying room inlet, screen impeller rotation speed, material circulation rate, etc., so as to obtain optimal equipment operating conditions combined with these experimental results. The results showed that by the corrugated solar collectors, the inlet hot air speed, material circulation speed and rotation speed of screen impeller were 5 m/s, 800 kg/h and 50 r/min, respectively. The drying efficiency of rapeseed could reach a maximum level, which could met daily drying requirement of 250 kg could be met.

Key words: rapeseed, solar energy, hot air, circulation, moisture content, drying efficiency