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基于温湿度数字传感的箱装烟丝物料再平衡时间分析

Analysis of equilibration time for cased cut tobacco based on digital temperature and humidity sensing

  • 摘要: 为明确贮存环境变化后箱装烟丝物料的适宜平衡时间,以实现快速投入使用,提升生产效率,开展了不同贮存环境下烟丝物料的平衡试验,并对比分析了不同类别烟丝物料的热传递特性。通过低温冷冻室和高温高湿室模拟冬夏两季极端气温场景,并基于数字传感技术实现密封状态下箱装烟丝物料温湿度的多点实时监控,从而获取烟丝物料在不同条件下的温湿度变化。结果表明,①在低温环境(温度约为‒20 ℃,相对湿度约为55%)下平衡后的叶丝、膨胀梗丝、膨胀叶丝,放置在恒温恒湿贮丝房(温度约为26 ℃,相对湿度约为60%)温度达到平衡所需要的时间分别为51.5、38.25、46.25 h;在高温环境(温度约为42 ℃,相对湿度为75%)下平衡后的叶丝、膨胀梗丝、膨胀叶丝,放置在恒温恒湿贮丝房,温度达到平衡所需要的时间分别为31.5、24.0、28.75 h。②箱装烟丝物料平衡过程中存在温度、湿度分布不均匀的情况,表现为表层物料温湿度更快达到平衡状态;相比于温度,在低温下,湿度更快达到平衡状态;叶丝回暖所需时间相对较多,膨胀梗丝和膨胀叶丝回暖所需时间相对较少。③温度平衡前后烟丝物料的填充值、整丝率、碎丝率、含水率等物理指标的变化均较小。该研究为异地供丝质量的稳定控制提供了理论参考。

     

    Abstract: In order to determine the appropriate equilibrium time of cased cut tobacco after changes in storage conditions, so as to enable rapid deployment and improve production efficiency, balance experiments were conducted on cut tobacco under different storage environments, and the heat transfer characteristics of different types of cut tobacco were compared and analyzed. Extreme temperature scenarios in winter and summer were simulated using a low-temperature freezer and a high-temperature, high-humidity chamber. Multi-point real-time monitoring of temperature and humidity inside sealed boxes of cut tobacco was achieved based on digital sensor technology, thereby obtaining the variation patterns of temperature and humidity under different conditions. The results showed that: 1) For leaf strips, expanded stem strips, and expanded leaf strips equilibrated in a low-temperature environment (approximately ‒20 ℃, relative humidity about 55%), the time required to reach temperature equilibrium after being transferred to a constant temperature and humidity storage room (approximately 26 ℃, relative humidity about 60%) was 51.5, 38.25, and 46.25 h, respectively. For those equilibrated in a high-temperature environment (approximately 42 ℃, relative humidity 75%), the corresponding times were 31.5 h, 24.0 h, and 28.75 h, respectively. 2) During the equilibrium process of boxed cut tobacco, uneven distribution of temperature and humidity was observed, with the surface layer reaching equilibrium faster. Compared with temperature, humidity reached equilibrium more quickly under low-temperature conditions. Leaf strips required relatively more time to warm up, while expanded stem strips and expanded leaf strips required relatively less. 3) The physical indicators of cut tobacco, such as filling value, whole strip ratio, broken strip ratio, and moisture content, showed only minor changes before and after temperature equilibrium. This study provides a theoretical reference for the stable quality control of cut tobacco supplied from different locations.

     

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