基于GE iFix软件和西门子PLC的碱回收蒸发控制系统

Control System of GE iFix and SIMATIC PLC in Alkali-callback Evaporator

通过VBA编程的方法,分析GE iFix数据库的结构和存储方式,结合后台调度,成功的开发了快速的日报表;并引入VBA数组概念,以数组名作起始地址,扩展下标进而扩展了GE iFix的I/O(输入/输出)点数;通过截取字符串,巧妙地解决了GE iFix数据库标签名不能很好的支持中文的问题。针对稳定的浓黑液浓度控制,分析了黑液浓度的主要影响因素——效压力和蒸气流量,采用了串级以及前馈控制,在实践中综合使用了GE iFix和SIMATIC PLC,获得了比较好的效果。

Quick daily reporter was successfully developed by using VBA programming, analyzing structure and storage manner, integrating background scheduler. With the aid of importing array concept of VBA, defining array name as starting address, extending subscript, problem ot l/O extension has been worked out; by intercepting character strings, insufficiency of sustaining Chinese in GE database has been solved. Focusing on stably controlling the black liquor density,analysing the main influence factors on black liquor density-effect pressure and steam flow,adopting series and fore-feedback control, some successful examples were obtained by using GE iFix and SIMATIC PLC in practice.