基于PLC双传式清污机自动控制系统探究
2021-09-03秦新风贺三清
秦新风 贺三清

[摘 要 ]为减少河道废物对机组的出力影响,提升水电站发电效率,同时杜绝采用人工清污方式产生的安全隐患,确保清污过程的可靠性,提出完善双传式清污机设计工作的建议。介绍该系统的主要构成、工作原理,提供一组经典的试验数据。通过分析研究后,认为双超声波液位传感器的安装过程简单,检查结果的精准性处于较高水平,配合使用PLC能明显提升清污机运作过程的可靠性,延长其使用年限,创造出更多的效益。
[关键词]PLC;清污机;自动化控制;水位差
[中图分类号]TP273 [文献标志码]A [文章编号]2095–6487(2021)06–00–02
[Abstract]In order to reduce the impact of river waste on the output of the unit, improve the power generation efficiency of hydropower stations, and at the same time eliminate the hidden safety hazards caused by the use of manual cleaning methods, and ensure the reliability of the cleaning process, a proposal to improve the design of the dual-pass cleaning machine is proposed. The article introduces the main composition and working principle of the system, and provides a set of very classic test data. After analysis and research, it is believed that the installation process of the dual ultrasonic liquid level sensor is simple, and the accuracy of the inspection results is at a high level. The use of PLC can significantly improve the reliability of the operation process of the cleaning machine, extend its service life, and create more Benefits.
[Keywords]PLC; cleaning machine; automatic control; water level difference
清污機是消除发电厂进水前池、泵站等其他水工建筑物附着在拦污栅上的树技、枯叶、杂草、城市垃圾、浮冰等常见装置之一,其功能以清除地表水中的杂物为主,减少发电站水头损失,提升水的流速进而确保发电机组、泵组等设备运行过程的安全、稳定、高效。近年,国内工业产业快速发展,与之相比的是白色污染程度不断加剧,特别是在汛期,地表水内悬浮杂物成倍增加,很可能堵塞拦污栅的网孔,以致拦污棚前后形成较大的水位差,影响水工建筑物正常功能的发挥,严重时造成设备停运。本课题介绍了一款PLC构成的清污机自动控制系统,其最大的特点是能实现对水位差及PLC的双重调控,进而保障系统运行安全性。
1 系统主要构成与工作原理
本系统投用阶段,先利用2个测深传感器依次测得栅前、栅后水位信号,利用输入电路滤波、隔离放大以后测算出差值,获得拦污栅前后的水位差信号,标定该信号后将其送进PLC内,通过触摸屏以厘米为单位清晰地呈现出栅前、栅后的真实水位差,为值班人员监测工作开展过程提供可靠信息。……
