废弃烟梗微波膨化过程多物理场耦合与调控机理研究

生物质资源的增值利用对促进我国循环经济发展具有重要科学意义和社会价值。本项目针对废弃烟梗微波膨化过程存在膨化不均匀、过程难以稳定控制等技术难题，开展废弃烟梗微波膨化过程多物理场耦合与调控机理研究。研究烟梗物料微波介电特性，探明物料介电特性随微波作用条件和温度变化的动态规律；通过数值模拟方法，建立烟梗微波膨化过程多物理场耦合动态介电特性模型和传热传质模型，探究微波能吸收与转化、传热传质与体积膨胀、孔隙形成等过程变化规律，阐明微波能量强度、物料温度与介电特性的构效关系，揭示烟梗微波膨化多场耦合机理，构建温度反馈-微波控制理论方法；研究烟梗微波膨化动力学特性，探索微波膨化条件对烟梗膨胀率、产物填充性能和色泽等指标的影响规律，揭示烟梗微波膨化与产物质量调控内在协同机制，形成烟梗微波膨化过程精准控制、产品质量稳定调控技术原型和基础理论。项目研究对促进废弃烟梗资源再制造产业发展和增值利用具有重要价值。

The value-added utilization of biomass resources has important scientific significance and social value to promote the development of circular economy in China. In this project, we have proposed the study on the mechanism of multi-physics coupling and regulating in the process of microwave expansion of waste tobacco stem, as there are some technical problems during tobacco stem expansion and product preparation via microwave radiation, such as non-uniform expansion, stability control difficulty in process, etc. The dielectric properties of tobacco stems will study under the microwave action, and to investigate the effects of microwave expansion conditions and temperature on the dielectric properties of materials. Mainly, the dynamic dielectric properties model and heat-mass transfer model are established by numerical simulation method during microwave expanding process of tobacco stems, which is to simulate the processes of microwave energy absorption and transformation, heat transfer and volume expansion, and pore forming, and explore the internal relationship among microwave energy intensity, material temperature and dielectric properties, revealing the microwave expanding mechanism and establishing the theory method on the temperature feedback-microwave control. Meanwhile, the dynamics of microwave expansion of tobacco stem are also studied for exploring the influence of microwave expansion conditions on key indexes such as tobacco stem expansion rate, product filling performance and color, revealing the cooperation mechanism of microwave expanding tobacco stem and the product quality control. Overall, the project will form the technical prototypes and basic theories in accurate control of microwave expansion process of tobacco stem and stable control of product quality. The research of this project has a great value to promote the remanufacturing industry development and value-added utilization of agricultural waste tobacco stem resources.