煤制甲醇水处理系统自动控制的研究与应用

刘艳红 项亚南 徐涛

摘要：针对某煤制甲醇项目废水水量大、水质复杂、处理流程复杂、人工控制影响控制精确度和实时性等问题，设计了一套高效稳定的深度水处理自动控制系统。根据煤化工污水处理工艺流程和出水水质要求，搭建了系统电气和网络拓扑结构，设计了由工控机、PLC、现场智能仪表、HMI 等组成的硬件系统，通过 PLC实现水处理自动控制，并利用 WINCC开发了上位机监控系统，最终实现了对水处理系统全过程的远程监视、参数设置、实时控制、报警、生成报表等功能。运行结果表明，设计的水处理控制系统长期稳定高效可靠运行，废水回用率高达97%，节约排污费超100万元/年，实现了节能减排和降本增效。

关键词：水处理;反渗透;PLC;监控

中图分类号：TP273             文献标志码：A        文章编号：1009-9492（2021）12-0155-07

Research and Application of Automatic Control of Water Treatment System in Coal-methanol Project

Liu Yanhong1，Xiang Yanan1，Xu Tao2

（1. Integrated Circuit Manufacturing Equipment Engineering Technology Research and Development Center， Jiangsu Vocational College ofInformation Technology， Wuxi， Jiangsu 214153， China;2. Wuxi Bozhong Automation Co.， Ltd.， Wuxi， Jiangsu 214124， China）

Abstract： In coal-methanol project， to solve the problems of large amount of wastewater， complex composition and treatment process， control accuracy and real-time performance are difficult to achieve by manual control. An efficient and stable automatic control system for advanced water treatment was designed. According to the requirements of coal chemical wastewater treatment process and effluent quality， the system electrical construction and network topology were built， and the hardware system composed of industrial computer， PLC， field intelligent instruments and HMI was designed. The automatic control of water treatment was realized through PLC， and the upper computer monitoring system was developed by WINCC. The remote monitoring， parameter setting and real time control， alarm， report generation and other functions were realized. The operation results show that the water treatment control system operates stably， efficiently and reliably for a long time， the wastewater reuse rate is as high as 97%， the sewage discharge fee is saved by more than one million yuan / year， and energy conservation， emission reduction， cost reduction and efficiency increase are realized.

Key words： water treatment; reverse osmosis; PLC; monitor

0 引言

《關于推进污水资源化利用的指导意见》提出，“双碳”形势下煤化工企业废水重在减排和资源化，需要企业践行低碳控制的水循环理念。近年来，煤化工行业快速发展，工业生产过程中产生的反渗透浓水、工业污水、循环排污水及部分工艺排水等污水量逐年增加，污水成分复杂、污染物多，其水处理流程复杂。现有水处理系统可采用人工控制现场电柜简单电气线路，此方式只适用于简单的水处理控制，很难实现精准实时控制和能耗节约，且存在安全隐患。在行业监管加强、人工成本大幅上升等因素影响下，本文旨在设计一套高效稳定的深度水处理自动控制系统，利用 PLC模块达到智能化控制和节约能耗目标，通过水处理远程监控系统，实现污水处理的智能监控、数据存储、预判预报警等功能。……