贮叶房空调控制系统设计

发布时间：2018-05-24 00:34

本文选题：烟叶贮存 + 温度场　；参考：《哈尔滨理工大学》2014年硕士论文

【摘要】：烟叶贮存是卷烟生产工艺流程中的重要环节，目的是使烟叶中添加的水分、料液及香料等物料得以相互渗透平衡。贮叶过程的温湿度变化对烟叶中化学成分的变化产生显著作用，从而影响香烟的感官质量，烟叶贮存环境的温湿度是由专用空调系统来调节的。目前我国烟草行业作为国家专项利税来源，生产规模世界最大，但主要生产设备自给率较低，而烟叶贮存相关技术研究的欠缺导致许多烟厂在烟叶贮存环节的质量不稳定，损耗很大，因此对烟草贮房的主要控制系统进行理论及应用方面的研究具有重要的实用价值和现实意义。本文在对贮叶房结构及工艺要求充分研究的基础上，，完成了基于PLC的贮叶房空调控制系统结构设计，包括硬件的模件选型配置及电气拖动系统的设计。研究了贮房叶堆的温度场建模问题，采用有限差分法对温度场进行数值模拟计算得到了贮叶环境下烟叶温度场分布模型。基于根据能量守恒定理和质量守恒定理建立了空调系统各部分数学模型，并进行了仿真研究。根据贮叶房温湿度变化的规律，设计贮房空调控制系统模糊PID控制器。实验结果表明所设计的控制器使系统的响应速度明显加快，超调量显著减小，稳态误差变小，各方面性能指标都优于传统的PID控制器。
[Abstract]:The storage of tobacco leaves is an important link in the process of cigarette production. The purpose is to make the moisture, liquid and spices in tobacco leaves permeate and balance each other. The changes of temperature and humidity during leaf storage have a significant effect on the changes of chemical composition in tobacco leaves, thus affecting the sensory quality of tobacco. The temperature and humidity of storage environment of tobacco leaves are regulated by special air conditioning system. At present, the tobacco industry of our country, as the national special profit and tax source, has the largest production scale in the world, but the self-sufficiency rate of the main production equipment is relatively low, and the lack of research on tobacco leaf storage related technology leads to the instability of the quality of many tobacco factories in the tobacco storage link. Therefore, it is of great practical value and practical significance to study the main control system of tobacco storage house in theory and application. Based on the study of the structure and process requirements of the vane storage house, the structure design of the air conditioning control system based on PLC is completed in this paper, including the selection and configuration of the hardware module and the design of the electric drive system. In this paper, the modeling of the temperature field of leaf stack in storage house is studied, and the temperature field distribution model of tobacco leaf under the environment of storage leaf is obtained by numerical simulation of temperature field with finite difference method. Based on the energy conservation theorem and mass conservation theorem, the mathematical models of air conditioning system are established and simulated. A fuzzy PID controller for air conditioning control system of storage house is designed according to the changing rule of temperature and humidity in storage room. The experimental results show that the designed controller accelerates the response speed of the system, decreases the overshoot and reduces the steady-state error. The performance of the controller is better than that of the traditional PID controller.
【学位授予单位】：哈尔滨理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TS43;TB657.2

【引证文献】