基于PLC的自动加氯系统在智能水厂中的应用

Application of PLC-based automatic chlorination system in intelligent waterworks

以金华仙源湖水厂为研究对象,结合其智能水厂升级建设实际应用,介绍了可编程逻辑控制器(PLC)在自动加氯系统中的应用模式。根据自动加氯系统中智能配药和智能投加2个子系统的功能需求和操作要求,分别介绍了编程实现逻辑及程序源代码。在智能投加系统中,投加的控制方式对系统整体运行效果起决定性作用,仙源湖水厂采用精细投药算法,前加氯采用流量比例控制,调控快速,效率高,后加氯和补氯采用流量比例复合环控制。引入余氯仪实际测量值,进行反馈对比运算,对扰动进行有效补偿,提高系统运行稳定性,投加效果更佳。水厂实际运行表明,运用基于PLC的智能控制技术能较好地提升加氯系统的整体性能,非常适合智能水厂的日常生产。

Taking Jinhua Xianyuanhu Waterworks as a case,combined with the practical application of its intelligent waterworks construction and upgrading,the application mode of programmable logic controller(PLC)in the automatic chlorination system was described.According to the functional requirements and operation requirements of the dispensing and dosing subsystems in the automatic chlorination system,the programming logic and program source code were introduced,respectively.In the intelligent dosing system,the control mode of dosing played a decisive role in the overall operation effect of the system.The fine dosing algorithm was applied in Xianyuanhu waterworks,the flow proportion control was adopted for the pre-chlorination with fast and efficient regulation,and the flow proportion compound circle control was adopted for the post-chlorination and the chlorine supplement.The actual measured value by the residual chlorine meter was introduced to carry out the feedback comparison,to effectively compensate the disturbance,improve the operation stability of the system,and achieve a better dosing effect.After the actual operation of the waterworks,the use of PLC-based intelligent control technology improved the overall performance of the chlorination system,which was very suitable for the daily production of the intelligent waterworks.