Optimization and Experimental Study of Drying Process Parameters for Rice in Hot-air Drying
Rice is one of the important grain crops globally,with indica rice being the predominant variety cultivated in Southern China.The harvested fresh rice has high moisture content and is unsuitable for long-term storage.Aming at the challenges of grain quality deterioration,particularly the occurrence of rice grain fissures during hot air drying in southern China,this study took 2 typical indica rice varieties,Zhongzao 35 and Yuzhenxiang,to investigate the influence of drying temperature,tempering time ratio,and initial moisture content on the drying fissure formation rate and drying rate of rice grains through single-factor experiments and Box-Behnken Design trials.The results showed that drying temperature had the most significant impact on both drying rate and fissure formation rate,followed by the relaxation ratio and initial moisture content.Experimental trials were conducted to meet the national standard for fissure formation rate,and optimal drying temperature,relaxation ratio,and initial moisture content parameters were determined for the two rice varieties.The optimal parameters for Zhongzao 35 were found to be 49.48℃,0.67 and 26%;while for Yuzhenxiang,they were 45.00℃,0.698 and 26%,respectively.Subsequent drying experiments conducted under the optimal parameters yielded drying rates of 0.022 80%·min-1 and 0.024 61%·min-1 for Zhongzao 35 and Yuzhenxiang,respectively,with additional crack rateof 2.87%and 2.80%,both below the national standard of 3.00%.This study demonstrated that the optimized drying process parameters provided a theoretical foundation for practical production and in-depth exploration of rice grain quality changes.
ricedryingdrying speedadditional crack rate
刘大为、秦锋、廖骞、王修善、谢方平、李铁辉
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湖南农业大学机电工程学院,智能农机装备湖南省重点实验室,长沙 410128
中共沅江市委党校,湖南沅江 413100
湖南农友机械集团有限公司,湖南 娄底 417700
水稻 干燥 干燥速率 爆腰增率
Hunan Provincial Department of Education Scientific Research ProjectHunan Provincial Agriculture Commission Project
国家科技期刊平台
NSTL
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