PLC在温度控制中应用研究.doc

PLC在温度控制中的应用研究 摘　　要 温度控制系统在工业控制领域中具有广泛的应用，如铸造厂、化工厂、炼钢厂等锅炉的温度控制系统，电加热炉的温度控制系统等。加热反应炉是冶金、化工工业常用的重要设备，过去仅依靠人工来进行操作，存在送料、温度、压力等条件变化时不能及时对其进行控制的问题，这就造成产品质量不稳定,甚至出现次品，造成原料浪费的后果。采用可编程控制器对加热炉进行控制，能大大提高生产效率和控制系统稳定性。而加热炉温度是一个大惯性系统，所以一般采用比例-积分-微分调节进行控制。本文在分析了温度控制系统研究现状的基础上，结合工业炉的工作原理和实际情况，给出了一种基于三菱FX2N系列可编程控制器的 温度自动控制系统设计方案，利用比例-积分-微分技术，实现了对工业用加热炉自动开启和加热的功能。本系统的应用有助于对生产过程中的升温进行精确、快速的控制，提高了工业生产中温度控制的效率。 关键词：可编程控制器；比例-积分-微分；温度控制  The Using of PLC in Temperature Control Abstract The temperature control system in the field of industrial control with a wide range of applications, such as casting plants, chemical plants, steel mills, boiler temperature control system, the electric furnace temperature control system. Heating reactor metallurgy, chemical industry, an important device to rely solely on the manual to operate, there is not timely feeding, temperature, pressure and other conditions change their control, which resulted in product quality is unstable, or even defective, resulting in the consequences of the waste of raw materials. Programmable controller to control the furnace can greatly increase the productivity and stability of the control system. The furnace temperature is an inertial system, so commonly used proportional - integral - differential regulation and control. On the basis of the temperature control system of the status quote, combined with the working principle and the actual situation of the industrial furnace is given based on Mitsubishi FX2N series PLC automatic temperature control system design, the use of proportional - integral - derivative technology, industrial furnace automatically turned on and heating. The applications of this system contribute to the accurate, rapid warming in the production process control and improve the efficiency of temperature control in industrial production. Key words：Programmable controllers, proportional - integral – differential， temperature control 目　　录 1 引言 1 1.1 论文研究背景及意义 1 1.2 国内外研究状况 1 1.3 本文研究思路 2 2 PLC简介 3 2.1