电解铝烟气净化控制系统设计方案书.doc

电解铝烟气净化控制系统 摘 要 关键词： Electrolytic control flue gas purification system Abstract A large amount of harmful gas will emit In electrolytic aluminum production process. the flue gas which filled in the electrolysis electrolysis workshop deteriorate the working conditions, affect the health of production workers. Electrolysis gas spread to the surrounding of plant, the pollution of the atmospheric environment was caused by recurrent. Therefore, it is necessary to carry out treatment of electrolytic gas, so that it can protect the environment, but also recyclable fluoride salt and Al2O3, lower production costs.  In this paper,we design a control system of flue gas purification,which uses a S7-300 series PLC as the controller. Based on the idea of environmental protection and energy saving, according to process of the system, for the bag filter pressure, outlet pressure and fresh gas containing aluminum fluoride level of detection to control and design, in order to reduce the flue gas of the atmospheric pollution of the environment and improve the recovery efficiency, to improve the the work environment of the electrolytic production. Key words: aluminum; flue gas purification; PLC control 目 录 摘 要 I Abstract II 第一章 引 言 1 1.1 系统设计背景 1 1.1.1 课题来源 1 1.1.2 研究的目的和意义 1 1.2 国内外研究现状 2 1.2.1 国外研究现状 2 1.2.2 国内研究现状 3 第二章 电解铝烟气净化系统 6 2.1 电解铝生产的工艺特点 6 2.2 净化工艺流程 7 2.3 净化系统组成 9 2.3.1 文丘里反应器 9 2.3.2 脉冲袋式除尘器 9 2.3.3 气力提升机 10 2.3.4 风动溜槽 11 2.4 净化控制技术综述 11 2.4.1 自动控制方式选择 11 2.4.2 净化方式选择 15 第三章 系统设计 17 3.1 系统控制原理及目标 17 3.1.1 控制原理 17 3.1.2 控制目标 19 3.2 压力检测 19 3.3 物位检测 20 3.4 温度检测 21 第四章 硬件设计 23 4.1 PLC选型 23 4.1.1 SIMATIC S7—300 PLC简介 23 4.1.2 S7—300的组成部件 24 4.2 模块选择 25 4.2.1 CPU模块 25 4.2.2 数字量输入模块 26 4.2.3 模拟量输入模块 26 4.2.4 数字量输出模块 27 4.2.5 电源模块 27 4.2.6 通信模块 28 4.3 执行器 29 4.3.1 执行器简介 29 4.3.2 执行器选型 29 第五章 软件设计 31 5.1 STEP 7论述 31 5.1.1 STEP 7简介 31 5.1.2 STEP 7的功能 32 5.2 PLC的I/O地址分配 33 5.3 系统程序流程图 34 5.4 软件编程 40 5.4.1 项目创建 40 5.4.2 硬件组态 41 5.4.3 定义符号表 42 5.4.4 编程界面 43 结束语 44 参考文献