摘要
为了提高稻谷机械干燥效率和干后品质,降低干燥能耗,以平均干燥速率r、爆腰率b和单位能耗e为指标,以热风温度(X1)、热风风速(X2)、转换点含水率(X3)、真空温度(X4)为试验因素,设计Box-Behnken Design(BBD)试验对稻谷热风-真空联合干燥工艺参数进行优化,并将优化结果与热风、真空单一干燥方式最优工艺参数对应的指标值相比较。结果表明,联合干燥的最优工艺参数为:X1=40℃、X2=0.7 m/s、X3=20.7%、X4=38.1℃,对应的平均干燥速率为0.000 483 g/(g·min)、爆腰率为6.3%、单位能耗为2 612 kJ/kg。联合干燥的平均干燥速率比热风干燥降低了29.5%,比真空干燥提高了33.1%;爆腰率比热风干燥降低了10%,比真空干燥降低了13.7%;单位能耗比热风干燥降低了60.1%,比真空干燥降低了12.6%,说明稻谷热风-真空联合干燥与单一干燥方式相比优势明显。
The study was conducted to improve the mechanical drying efficiency as well as the quality of dried rice,and reduce the energy consumption of drying.Taking average drying rate(r),crackle ratio(b)and unit energy consumption(e)as indicators,hot air temperature(X1),hot air speed(X2),moisture content at conversion point(X3)and vacuum temperature(X4)as test factors,a Box-Behnken Design(BBD)was designed to optimize the parameters of hot air and vacuum combined drying process for rice.The results were compared with the corresponding index values of single drying methods.The results showed that the optimum parameters of combined drying were:X1=40℃,X2=0.7 m/s,X3=20.7%,X4=38.1℃.In addition,the average drying rate was 0.000 483 g/(g·min),the crackle ratio was 6.3%,and the unit energy consumption was 2 612 kJ/kg.The average drying rate of combined drying was 29.5%lower than hot air drying and 33.1%higher than vacuum drying.The crackle ratio was 10%lower than hot air drying and 13.7%lower than vacuum drying.The unit energy consumption was reduced by 60.1%compared to hot air drying and 12.6%to that of vacuum drying.Overall,hot air and vacuum combined drying method for rice has obvious advantages over single drying methods,which provides a theoretical basis for its practical application.
作者
张记
孟国栋
彭桂兰
张雪峰
杨玲
ZHANG Ji;MENG Guodong;PENG Guilan;ZHANG Xuefeng;YANG Ling(College of Engineering and Technology,Southwest University,Chongqing 400715,China)
出处
《食品与发酵工业》
CAS
CSCD
北大核心
2019年第18期155-161,共7页
Food and Fermentation Industries
基金
国家自然科学基金项目(31301575)
关键词
稻谷
联合干燥
平均干燥速率
爆腰率
单位能耗
参数优化
rice
combination drying
average drying rate
crackle ratio
unit energy consumption
parameter optimization
