稀土产品专用正压过滤设备研究

发布时间：2018-02-25 18:20

本文关键词： 稀土产品正压过滤工艺设备自动化过滤流场分析　出处：《集美大学》2016年硕士论文　论文类型：学位论文

【摘要】：稀土元素由于特殊的原子结构导致它们具有优异的发光特性,因此稀土产品被广泛使用在各行各业中,然而稀土资源的珍贵性就对其加工处理技术和设备提出了更高的要求。过滤脱水作为后续处理稀土产品的一个重要步骤,其生产工艺技术和设备也在面临不断的挑战与发展。在生产过程自动化需求的大环境下,本文针对某企业实际要求对其用于稀土产品滤水处理的一套过滤工艺及其设备进行了分析与改进。稀土产品生产过程中,过滤脱水工艺过程是滤水处理设备设计的关键。文中首先简要分析了稀土荧光粉的生产工艺和生产过程对过滤脱水的工艺要求。在原有过滤生产工艺基础上,提出了增加热风干燥过程,并利用Pro/E软件对过滤系统管路和设备进行了合理的空间布置。根据已有滤芯的工作情况,修改滤芯的结构,在不影响过滤效率的条件下,有效提高了滤饼的附着能力,保证了正压脱水和热风对滤饼的作用时间,提高了滤饼的干燥度。计算了滤芯的过滤能力、滤布和滤饼产生的压降,并得到总压降计算公式;根据生产要求,设计选择了管径规格、阀门以及打料泵,对过滤压力容器进行了结构设计,并利用ANSYS软件对其进行有限元强度校核。为提高生产效率,保证工艺过程先进性和可靠性,根据生产工艺过程所需的分段处理时间、工作压力等参数,设计通过可编程控制器(PLC)控制电磁阀开启或报警,完全实现工艺生产过程电气自动化。讨论了过滤控制系统电路、元器件和接口等软硬件设计。通过对滤芯结构的简化,建立了4个不同滤饼厚度下的过滤流场模型,分别从边界条件和滤芯结构两个方面对滤孔产生的平均压差变化和过滤时出口平均速度变化进行分析,并通过对比选出了滤芯过滤的最佳边界条件和滤芯结构。本文根据企业实际需求,研究了稀土荧光粉过滤工艺设备的相关关键技术,研究的设备可以提高过滤生产工艺中的过滤精度和荧光粉的脱水率,既保证了企业的产品质量和生产效率,还减少了环境污染。因此,具有较好的经济和社会效益。
[Abstract]:Due to their special atomic structure, rare earth elements have excellent luminescent properties, so rare earth products are widely used in various industries. However, the scarcity of rare earth resources puts forward higher requirements for its processing technology and equipment. Filtration dehydration is an important step in the subsequent processing of rare earth products. Its production process technology and equipment are also facing constant challenges and development. In the production process automation environment, This paper analyzes and improves a set of filtration process and its equipment for rare earth products in accordance with the actual requirements of a certain enterprise. The process of filtration dehydration is the key to the design of filter water treatment equipment. Firstly, the production process of rare earth phosphors and the process requirements for filtration dehydration are briefly analyzed in this paper. It is proposed that the hot air drying process be increased, and the reasonable space arrangement of the pipe and equipment of the filter system is carried out by using Pro/E software. According to the working conditions of the existing filter elements, the structure of the filter element is modified without affecting the filtration efficiency. The adhesion ability of filter cake is improved effectively, the action time of positive pressure dehydration and hot air on filter cake is guaranteed, and the drying degree of filter cake is improved. The filter ability of filter core, the pressure drop produced by filter cloth and filter cake are calculated, and the calculation formula of total pressure drop is obtained. According to the production requirements, the pipe diameter specification, valve and charging pump are selected to design the structure of the filter pressure vessel, and the finite element strength check is carried out by using ANSYS software. In order to improve the production efficiency, To ensure the advanced and reliability of the process, according to the processing time, working pressure and other parameters required by the production process, the programmable controller (PLC) is designed to control the solenoid valve to open or alarm. The design of hardware and software of filter control system circuit, components and interfaces are discussed. By simplifying the structure of filter element, four filter flow field models with different filter cake thickness are established. The variation of the average pressure difference produced by the filter hole and the average velocity of the outlet during filtration are analyzed from the two aspects of the boundary conditions and the structure of the filter core, respectively. The optimum boundary conditions and filter element structure of filter element filtration were selected by comparison. According to the actual demand of enterprises, the key technologies of rare earth phosphor filter technology were studied in this paper. The equipment studied can improve the filtration precision and the dewatering rate of phosphor in the filtration production process, which not only guarantees the product quality and production efficiency of the enterprise, but also reduces the environmental pollution. Therefore, it has good economic and social benefits.
【学位授予单位】：集美大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TQ051.85

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