冷却塔风机优化节能控制系统的设计

Design of the Optimization Energy-Saving Control System of Cooling Tower Fan

针对国内外冷却塔风机节能系统的现状,在研究分析冷却塔风机闭环变频节能控制原理的基础上,设计开发了一种冷却塔风机优化节能控制系统。采用S7-200系列PLC与变频器技术的结合,实现了变频调速风机运行的闭环控制;对变频信号的离散化处理和转速的台阶式控制,有效地避免了风机变频调速时转速震荡引起的工作寿命降低的问题;与风机故障预警报警系统的有机结合,实现了风机的安全控制,大大减少了风机的检修次数,解决了监控过程中误报漏报问题。通过力控组态软件实现了上位机对风机节能控制的远程操作和实时运行状态的远程监控。经生产实践证明,该优化节能控制系统的工作性能稳定,具有良好的推广应用价值。

In allusion to the present situation of cooling tower fan energy saving system at domestic and abroad, a kind of cooling tower fan optimization energy-saving control system was designed and developed based on the research and analysis of the cooling tower fan energy-saving closed-loop control principle. Combined with S7-200 series PLC and frequency converter, the optimization energy-saving control system realized the fan running frequency control of motor speed closed loop control; discretized the vaviable frequency signal processing and terraced control of rotational speed, it avoided the problem of reduction of working life caused by fan frequency conversion speed shock effectively; and the organic combination af fan failure warning alarm system, realized the cooling tower fan safety control, reduced the fan maintenance times greatly, and solved the problem of false alarms and missed alarms in the monitoring process. Through the force control configuration software, it realized the upper machine fan energy-saving control of the remote operation and real-time remote monitoring of running status. It has been found that this optimal energy-saving control system had stable performance, therefore it is valuable in promotion and application.