高效、节能挤压制粒成形技术研究

发布时间：2018-01-20 10:48

本文关键词： 制粒压辊转子扭矩能耗　出处：《南京理工大学》2012年硕士论文　论文类型：学位论文

【摘要】：随着饲料产业和生物质能源产业的快速发展,制粒机的需求越来越大,性能要求也越来越高,但目前制粒设备低产能、高能耗问题很突出,已成为制约国内制粒机械装备发展的瓶颈,极大地削弱了产品的国际竞争力。本文通过理论建模、数值模拟分析和实验验证对高效节能挤压制粒成形技术进行了研究,主要工作如下： (1)基于对制粒结构和制粒机理的研究,建立了粉体单孔挤压力学模型,确定了压辊的受力区域,并建立了环模制粒扭矩模型和能耗模型。 (2)对设计的六种压辊支撑结构进行了有限元分析,结果表明支撑结构的刚性跟支承轴的位置、轴的截面形状和截面面积有关；只要采用合适的支撑方式,支撑刚性最多可以提高25%以上,有利于提高制粒稳定性,实现节能降耗。 (3)对模孔中不同物料挤压过程作了有限元分析,结果表明：长径比对挤压受力有重大影响,采用合适的长径比可有效降低能耗。 (4)对转子系统进行了模态分析,分析了不同模态下的固有频率和振型；基于不同边界条件和不同筋板厚度对转子系统进行了对比。 (5)建立了转子系统动态分析模型,基于该模型对转子系统的动态特性进行了分析,结果表明挤压制粒过程呈不稳定状态,不同转速下转子的动态特性存在差异,进而影响制粒稳定性。 (6)进行了扭矩实验,并验证了转子系统动态特性分析结果。本文研究成果对制粒机理的完善,制粒产量的提高及制粒能耗的降低具有重要的指导意义。
[Abstract]:With the rapid development of feed industry and biomass energy industry, the demand of granulator is increasing, and the performance requirements are higher and higher. But at present, the problem of low production capacity and high energy consumption of pelletizing equipment is very prominent. Has become a bottleneck restricting the development of domestic granulation machinery and equipment, greatly weakening the international competitiveness of products. Numerical simulation analysis and experimental verification are carried out to study the high efficiency and energy saving extrusion granulation technology. The main work is as follows: 1) based on the research of granulation structure and granulation mechanism, the mechanical model of single hole extrusion of powder is established, the force region of press roller is determined, and the torque model and energy consumption model of ring die granulation are established. The results show that the rigidity of the supporting structure is related to the position of the supporting shaft, the shape of the shaft section and the area of the section. As long as suitable support mode is adopted, the rigidity of support can be increased by more than 25%, which is helpful to improve the stability of granulation and realize energy saving and consumption reduction. The finite element analysis of the extrusion process of different materials in the die hole shows that the ratio of length to diameter has a great influence on the extrusion force, and the energy consumption can be effectively reduced by adopting the appropriate aspect ratio. (4) the modal analysis of rotor system is carried out, and the natural frequency and mode shape under different modes are analyzed, and the rotor system is compared based on different boundary conditions and different stiffened plate thickness. Based on the model, the dynamic characteristics of the rotor system are analyzed. The results show that the extrusion granulation process is unstable. The dynamic characteristics of rotor are different at different speeds, which will affect the stability of granulation. The torque experiment is carried out and the analysis results of the dynamic characteristics of the rotor system are verified. The research results in this paper have important guiding significance for the improvement of granulation mechanism, the increase of granulation yield and the reduction of granulation energy consumption.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH69;S817.12

【引证文献】