多品种烟丝平衡含水率模型构建及机理研究

Model Fitting and Mechanism Study of Equilibrium Moisture Content for Multi-Variety Tobacco Shreds

摘要

为满足生产过程中对烟丝含水率的稳定控制，迫切需要对环境温湿度进行精准预测。针对叶丝、膨胀烟丝、薄片丝和膨胀梗丝等的平衡含水率，分别构建了恒定温度下以水活度为自变量的典型等温吸湿模型和包含温度、湿度双变量的平衡含水率/平衡相对湿度模型。通过评估决定系数 （R²） 和均方根误差 （RMSE） ，确定 DLP（Double Logarithm Polynomial） 模型和 Modify Oswin 模型具有较好的拟合精度，其中 Modify Oswin 模型的R²>0.99，RMSE<0.3%。通过分析不同烟丝的孔隙结构、糖类物质等，发现膨胀梗丝和薄片丝的中大孔径（>7.5 μm）占比较高，其水分主要以自由水形式存在，吸湿性波动较大；而叶丝和膨胀烟丝的还原糖质量分数较高，易于形成结合水，具有较强的水分保持能力。研究结果为车间烟丝生产和贮藏过程的温湿度设置提供了指导。

Abstract

Moisture content in cut tobacco is a critical factor influencing cigarette production efficiency, product qualification rate, and smoking quality. To achieve stable control of tobacco moisture content during production, accurate prediction of ambient temperature and humidity is urgently required. Typical isothermal moisture absorption models with water activity as the independent variable at constant temperature, as well as equilibrium moisture content/equilibrium relative humidity models involving both temperature and humidity variables, were established for the equilibrium moisture content of cut leaf tobacco, expanded cut tobacco, cut sheet tobacco and expanded cut stem tobacco, respectively. By evaluating the coefficient of determination (R²) and Root Mean Square Error (RMSE), the Double Logarithm Polynomial (DLP) model and the Modify Oswin model were confirmed to exhibit satisfactory fitting accuracy, among which the Modify Oswin model achievedR² > 0.99 and RMSE < 0.3%. Through analyzing the pore structure and sugar components of different cut tobacco types, it was found that expanded cut stem tobacco and cut sheet tobacco have a high proportion of mesopores and macropores (>7.5 μm), with moisture mainly existing as free water, resulting in significant fluctuations in hygroscopicity. In contrast, cut leaf tobacco and expanded cut tobacco possess a higher mass fraction of reducing sugars, which tend to form bound water and present strong water retention capacity. The results provide guidance for setting temperature and humidity parameters in the production and storage of cut tobacco in manufacturing workshops.

关键词

平衡含水率 / 环境温湿度 / 数学模型 / 孔隙结构 / 糖类质量分数

Key words

equilibrium moisture content / environmental temperature and humidity / mathematical model / pore structure / sugar mass fraction

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基金资助

教育部基本科研业务费(222201717003)

中国烟草总公司重点研发项目(110202402027)

浙江中烟工业有限责任公司重点科技项目(ZJZY2023A003)