基于视觉识别的苜蓿远红外热风干燥工艺试验研究

Experimental research on the process of radon hot air drying based on visual recognition

针对苜蓿草在干燥过程中营养成分丢失的问题,提出远红外热风干燥技术,解决苜蓿草捆干燥过程成本高、效率低、品质低的问题。以苜蓿干燥过程中的苜蓿密度、加热板到物料的距离、加热温度进行单因素试验,比较不同影响因素下的水分变化情况。设计L9(3^4)正交试验,以干燥后视觉识别苜蓿叶绿素程度为感观指标,研究3个因素影响大小。并利用透射电镜将干燥前后的切片进行验证,分析结果可知:干燥后细胞间空隙率越高,失水程度越高,细胞内部器官叶绿体被溶解的越多,所得苜蓿营养较差。经过正交试验得出的最优组合为干燥温度40℃,密度为210 kg/m^3,距离150 mm。

Aiming at the problem of loss of nutrients during the drying process, a far-infrared hot air drying technology was proposed to solve the problems of high cost, low efficiency and low quality in the drying process of alfalfa bales. The single factor test was carried out with the density of tantalum in the drying process, the distance from the heating plate to the material, and the heating temperature, and the water changes under different influencing factors were compared. The L9(3^4) orthogonal test was designed to visually identify the chlorophyll degree as a sensory index after drying, and the influence of three factors was studied. The sections before and after drying were verified by transmission electron microscopy. The results showed that the higher the intercellular void ratio after drying, the higher the degree of water loss, and the more the chloroplasts in the internal organs of the cells were dissolved, the poor nutrition was obtained. The optimal combination obtained by orthogonal test is a drying temperature of 40 ℃, a density of 210 kg/m^3 and a distance of 150 mm.