基于PLC的热风干燥机的设计..docx

南 京 工 程 学 院毕业设计说明书(论文)作 者： 乔峰 学 号： 1204354117系 部： 能源与电气工程学院 专 业： 自动化 题 目：基于多路PID的双热源式热风干燥机的设计 指导者： 刘利 讲师 (姓 名) (专业技术职务)评阅者： (姓 名) (专业技术职务) 2016年 5月 南 京热风干燥系统是一种提供温度恒定，风量恒定的工业热风的系统，在印刷行业和造纸等行业有着广泛的应用。传统的热风干燥系统只使用电加热作为热源，同时用作除湿装置，能耗较高；而新型的双热源式热风干燥机，增加了热泵装置，热泵可通过冷凝过程进行除湿，并且此过程吸收的热量又可以用来加热，大大降低了能耗。本文主要介绍了一种以PLC为控制中枢的双热源式热风干燥机，详细介绍了其硬件构成，控制要求以及控制算法的基本实现方法。在温度和风量的控制中，引入了PID算法，并结合PID功能，达到这两个参数的精确控制。并且由于PID的引入，使系统具有了很强的抗干扰能力。本文还涉及了组态技术，通过撰写组态界面使系统易于使用。此外，对系统的能耗进行了分析，提出了几种降低能耗提高效率的方法。经过调试和检验，本系统温度和风量的控制均稳定且快速，达到了预期的控制要求。关键词 热风干燥系统 热泵除湿 PID算法 组态 PLC毕业设计说明书（论文）中文摘要毕业设计说明书（论文）外文摘要Title The Design of A Convective Hot Air Dryer Based On Multi-loop PID Algorithm AbstractHot air drying system is a system that provides hot air which has constant temperature and air volume, it’s been widely used in printing and papermaking industry. The traditional hot air drying systems only use electrical heating as their heat source and at the same time the dehydrating unit. They have higher energy consumption than the new hot air drying systems which are equipped heat pump as the additional heat source. The condensation process of heat pump can not only be used to dehumidification but also to heat. It reduces the energy consumption quite a lot.This article is mainly focused on a bio heat source hot air system based on PLC, introduces its hardware, control requirement as well as the way to realize it in detail. PID algorithm is introduced to control temperature and air volume precisely and the system gets the very strong anti-interference ability in the wake of the introduction of PID algorithm. Configuration Technology is also involved in this article to make the system easier to use. Furthermore, we made some analyzes about power consumption of the system, after that came up with some kinds of methods to improve its efficiency.We can control temperature and air volume steady and quickly after tuning it. Which achieves the control requirement. Keywords Hot air drying