【摘要】 为解决秋季稻谷热泵干燥中温升难的问题,设计两个低温恒风速与变风速干燥试验方案,并对干燥箱稻谷脱水过程进行了总能耗比较和火用分析。结果表明:恒风速干燥过程中干燥速率随风速和温度的增大而增大,火用效率随风速的增大而减少。相同温度条件下变风速分程干燥,比恒风速干燥总能耗低,比大风速干燥火用效率值大,比小风速干燥消耗时间短。试验得到最优参数为前7h风速为0.7 m/s、后程风速为0.4m/s,当温度为45℃和55℃时干燥的火用效率分别为44.05%和57.49%,对南方秋季稻谷干燥具有一定指导意义。更多还原

【Abstract】 In order to solve the problem of temperature rise in heat pump drying rice in autumn.Two drying test scheme were been set,for the low temperature constant rate drying and variable wind speed drying.Both the total energy consumption and exergy analysis were been taken comparison of the drying process of rice.Experimental results show that the drying rate increases with wind speed and temperature go up in constant speed drying process.However,both the exergy efficiency and total energy consumption decrease with the increase of the wind speed.The total energy consumption of the variable wind speed drying is lower than that of the big constant wind speed experience groups.And the drying time is shorter than the small constant wind speed groups under the same temperature condition.The optimal parameters are obtained by experiment is that the first 7hours the wind speed is 0.7 m/s,then 0.4 m/s.When the temperature is 45 ℃,the exergy efficiency is 44.05% and the temperature in 55 ℃ is 57.49%.It has a certain guiding significance for rice drying in southern china.更多还原