【作者】 王正顺；

【导师】 陈克复；

【作者基本信息】 华南理工大学 ， 制浆造纸工程， 2010， 博士

【摘要】 纸张电磁干燥技术是利用电磁加热原理干燥纸张,是一种不同于传统蒸汽干燥的全新的纸张干燥技术。在环保压力日益严峻、能源危机日益逼近的今天,研究纸张电磁干燥技术就有其特别重要的意义,特别是对于高速卫生纸机来说,更有其客观现实需要和巨大发展潜力。本论文综述了国内外相关研究中对纸张干燥传热传质、电磁感应加热、工业过程控制等的研究进展,介绍了研究多孔介质传热传质过程的Luikov唯象理论和Whitaker体积平均理论,提出了电磁穿透干燥的概念,分析了电磁干燥技术的传热传质过程,利用多孔介质气流干燥理论,结合纸张气流穿透干燥的特点,模拟干燥条件,建立了纸张气流穿透干燥的数学模型：纤维颗粒热平衡方程：穿透空气气相能量方程：气相物质连续平衡方程：纸页干燥固相纤维连续方程：纤维固相动量方程：并对数学模型进行了分析求解。利用自制实验装置进行了穿透热风干燥实验。通过实验发现,利用数学模型计算的理论数值与实验结果吻合较好,证明本研究提出的数学模型和数值计算方法比较可靠和有效。本论文以电磁感应原理为基础,结合纸张干燥的要求,运用AUTOCAD软件设计了相应的实验室用电磁干燥装置,并详细剖析了其各个部分的选材和结构,通过UG软件的实体建模、装配建模等模块对电磁干燥装置的各个部分进行了三维仿真设计和整体装配,最后用ANSYS软件对电磁烘缸干燥装置主体部分进行了传热和受力分析,从理论上验证其设计的合理性。本论文利用自制实验装置,进行了电磁干燥装置的过程控制实验、加热均匀性实验、加热温度反馈滞后性及准确性实验,证明电磁干燥技术能够满足纸张干燥的要求。通过纸张电磁干燥实验,探讨了电磁干燥技术对纸张性能的影响,证明其更适合于吸收性高的生活用纸等的生产。通过应用实验,证明电磁干燥技术干燥效率高,干燥速度快,为电磁干燥技术的工程化提供了理论支持。本论文相应开发了用于电磁干燥装置的隔热保温有机硅涂料。采用甲基三氯硅烷、二甲基二氯硅烷和苯基三氯硅烷通过加温催化水解缩合,制得了有机硅树脂。通过对单体配比、催化剂、反应温度和时间等因素的研究,确定了合成性能良好的有机硅树脂的原料配比——甲基三氯硅烷：二甲基二氯硅烷：苯基三氯硅烷=2.5：1：5。通过对耐高温颜填料及助剂的选择和实验,确定了耐高温涂料配方。通过应用实验及ANSYS模拟仿真表明,所得到的涂料具有较好的物理机械性能、耐高温、耐冲击及隔热保温等性能。本论文对纸张电磁烘缸干燥技术的研究,是对节能、环保、高效的纸张干燥新技术的一种探索,在纸张电磁干燥技术理论和实践两方面都有较大的意义。更多还原

【Abstract】 Electromagnetic drying of paper is based on the principle of electromagnetic heating drying, which is different from the traditional steam drying of paper. In the day of increasingly energy and environment pressure, it is full of high sense to search the electromagnetic drying of paper. Especially for high-speed tissue paper machine, it possesses objective reality and great potential for development.This dissertation reviews the domestic and international research in heat and mass transfer for paper drying, electromagnetic induction heating, industrial process control, etc. It introduced heat and mass transfer in porous media of Luikov Whitaker phenomenological theory and the average volume theory. Following that, the concept of electromagnetic penetration drying was put forward. The drying of the electromagnetic heat and mass transfer process were analyzed. Using air drying of porous media theory, combined with the characteristics of flow through air drying, the mathematical model was established by simulating drying conditions, which concludes five differential equations: Fiber particle heat balance equation: Gaseous phase energy equation of through air: Gas continuous balance equation:. Continuous equation of solid fiber: Momentum equation of solid fiber: The mathematical model was analyzed and solved.Through hot air drying experiments was carried out by using home-made experimental device. It was found that the theoretical calculations using mathematical agreed well with the experimental results. It was proved that the mathematical model and numerical calculations were reliable and effective.Based on the principles of electromagnetic induction, combined with paper drying requirements, the dissertation uses AutoCAD software to design the appropriate laboratory electromagnetic drying device. The selection of material and structure of it’s parts were analyzed. By using UG software modeling, assembly modeling module, it carried out three-dimensional simulation of the design and overall assembly of the electromagnetic drying unit. Finally, by using ANSYS software, the heat transfer and stress analysis were carried out for the main part of electromagnetic dryer device, which verified the rationality of the design in theory.By using self-made experimental device, the dissertation carried out process control experiment, experiment heating uniformity experiment, heating temperature and the accuracy of the feedback lag experiment. The results proved that electromagnetic drying technology could meet the requirements of paper drying. Through making the experiments of paper electromagnetic drying, the dissertation discussed the effects on paper physical characteristics and demonstrated that it is more suitable for production of the high absorption tissue paper. By the application experiments, it proved that electromagnetic drying was of high drying efficiency and significant economic benefits, which provides the theoretical support for the application of electromagnetic drying technology.The silicone coating of thermal insulation was developed for electromagnetic drying system. The silicone resin was obtained by the use of methyl trichlorosilane, dimethyl dichlorosilane, and phenyl-trichlorosilane. Through the study of monomer ratio, catalyst, reaction temperature and time, the well-received performance of silicone resin ratio of raw materials was that methyl trichlorosilane:dimethyldichlorosilane:phenyl trichlorosilane 2.5: 1:5. By the selection and testing of filler and additive, the high temperature resistant coating formulations were confirmed. Through a series of application experiments, it showed that the coating has good mechanical properties, thermal insulation, impact resistance properties and high temperature resistance.The study of electromagnetic drying technology of paper has both theoretical and practical significance.更多还原