扇贝柱热风干燥工艺及干燥模型的研究

Hot-air drying process and drying models for scallops

以海湾扇贝柱为原料,研究了热风温度、风速对其干燥速率的影响,并进一步采用非线性回归分析比较Newton、Page、Henderson and Pabis、Logarilunic和Wang and Singh 5种薄层干燥模型的拟合程度,确定扇贝柱热风干燥最适干燥模型,求得模型表达式。结果表明,扇贝柱热风干燥是一个降速干燥过程,提高热风温度和风速可以显著缩短干燥时间,但是干燥强度过大会使干制品品质下降。因此,综合考虑干燥效率和干制品品质,在试验条件下,选择热风温度55℃、风速1.0 m/s为扇贝柱较适宜的干燥条件,试验条件下Logarithmic模型拟合度最高,可以用来预测海湾扇贝柱热风干燥过程中的含水率,模型表达式为MR=0.9920exp(-(-0.00028T2-0.08666T+0.23677U2-6.52129U+0.10584TU+6.54635)t)+0.0067。

The scallops was chosen as hot-air drying material, analyzed the influence of the main parameters air temperature and air flow velocity on the drying rate and energy consumption in the drying process. Using five kind of thin layer drying models to investigated the thin layer drying characteristics. Compared Newton and Page, Logarilunic, Henderson and Pabis, Wang and Singh models according to their coefficient of correlation to estimate drying process, and determined the optimum drying air drying model. So as to identify a suitable for scallops drying conditions. The results show that, increasing temperature or air flow velocit can greatly shorten the drying time. But the quality of scallops maybe declined if the drying strength is too large. Therefore, the optimal parameters are temperature 55 ℃, air flow velocity 1.0 m/s. Under certain experimental conditions, Loqarithmic modles fit the hi qhest.