实验室用叶丝滚筒干燥机的研制

摘要

In order to simulate cut tobacco drying in a primary processing line exactly, a laboratory cut tobacco cylinder dryer was designed based on the working principle of thin plate cylinder dryer. The designed dryer was mainly composed of a bracket, a drying cylinder, a frequency conversion drive system, a heating temperature control system and a moisture exhaust system. Cylinder wall temperature was controlled via a heater, a heat insulation layer and an automatic temperature control system; cylinder's rotational speed was regulated by a frequency conversion motor; and the wet air was exhausted through moisture exhaust system. The inlet and outlet of tobacco were combined into one, and the bracket structure was designed so as to facilitate drying cylinder tipping and accelerate tobacco discharging. Taking the cut rags of brand"Gold leaf (Dajinyuan)"as experimental material, three drying devices, laboratory cylinder dryer, electric oven and thin plate cylinder dryer (the control), were compared in terms of physical properties and sensory quality of dried tobacco. The results showed that:1)The filling value of cut strips dried by laboratory cylinder dryer was 4.54 cm3/g and that of the control was 4.62 cm3/g, the elasticity, crimpness and loosening degree of the two were close, and the consistent rate of sensory quality between them reached 68%, which satisfied the requirements of sensory quality consistency for cigarettes. 2) The filling value of cut strips dried by electric oven was 4.02 cm3/g, and the sensory quality of the same was slightly worse. 3) The performance of laboratory cylinder dryer was close to that of thin plate cylinder dryer.%为解决实验室与制丝生产线不同干燥设备干燥叶丝的感官质量存在较大差异等问题,基于叶丝薄板滚筒干燥机工作原理,研制了一种实验室用叶丝滚筒干燥机.该设备由机架、烘丝筒、变频驱动系统、加热控温系统和排潮系统等部分组成.通过加热器、保温层和自动控温系统对烘丝筒壁温度进行调控;利用变频电机调节滚筒转速;通过排潮系统对干燥机进行排潮;将出料口与进料口合二为一,自行设计的机架结构便于烘丝筒翻转倾斜,实现快速出料.利用"黄金叶(大金圆)"配方叶丝,考察了实验室用干燥机、电烘箱和生产线薄板滚筒干燥机(对照样)3种干燥方式对叶丝物理性能和卷烟感官质量的影响.结果表明:①采用实验室用干燥机,叶丝填充值为4.54 cm3/g,对照样为4.62 cm3/g.与对照样相比,叶丝弹性、卷曲度和松散性接近,卷烟感官同质化率达68%,达到了卷烟感官同质化要求.②采用烘箱法,叶丝填充值最低,为4.02 cm3/g,且卷烟样品感官质量稍差.③实验室用干燥机与薄板滚筒干燥机的干燥效果接近,均优于电烘箱,可以满足实验室与制丝生产线干燥叶丝感官质量无差异的需求.