某工厂反应炉控制系统设计.doc

摘要 水玻璃生产过程主要包括加、混料过程和加热炉燃烧换向过程，传统生产控制采用继电器—接触器电气控制系统存在线路复杂、可靠性稳定性差、故障诊断和排除困难等难题。 本文分析了控制原理，同时根据的控制要求和特点，制定了PLC为核心的控制系统的设计方案，完成了电气控制系统硬件和软件的设计。其中硬件设计包括PLC机型的选择、I/O端口的分配I/O硬件接线图的绘制；软件设计选用的是经验设计法，设计出PLC的梯形图程序。对PLC控制的工作过程作了详细阐述 最后对该系统进行了模拟演示，通过调试，本设计能完成的控制功能。 PLC设计该工厂控制系统，使系统控制变得灵活、控制线路得到了简化、可靠性稳定性得到提高、故障率降低。 关键词:水玻璃;PLC;控制;系统 Abstract Water- glass production process includes adding, mixing process and the combustion furnace commutation process, the traditional production control using relay - contactor electrical control system, such a system exists circuit complexity, reliability, poor stability, fault diagnostics and troubleshooting difficulties and other problems. This paper analyzes a plant reactor system control theory, and according to the system control requirements and characteristics developed by PLC as the core of the control system design, and completed the electrical control system hardware and software design. The hardware design includes the selection of the motor, the motor main circuit drawing, valve selection, sensor selection, PLC choice of models, I / O port assignment and I / O hardware wiring diagram drawing, etc.; software design empirical design method is chosen and designed according to the design method of the PLC ladder program. In this paper, plus PLC control, mixing process and the furnace combustion process of commutation process works elaborated. At last, the control system was simulated demonstration, through commissioning, the design of the system to complete the required control functions. By adopting the PLC design the control system of the plant, the system control becomes flexible control circuit is simplified and reliability improved stability, the failure rate is reduced Keywords：Water- glass; PLC; control; system 目 录 1 绪论 1 1.1研究背景与意义 1 1.1.1水玻璃主要生产过程 1 1.1.2研究目的与意义 1 1.2 PLC研究现状 1 1.2.1 PLC的发展历史及定义 1 1.2.2 PLC的特点 3 1.2.3 PLC的应用领域 4 1.3 本设计的研究内容 4 2 方案选择与确定 7 2.1 方案一：采用单片机为核心设计系统 7 2.2 方案二：采用PLC为核心设计系统 8 2.3 方案比较与确定 8 3 硬件的设计及选择