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2017

新莆京变频器在自来水行业的成功应用

作者：

　　一、序言

　　传统风机、水泵调节流量大小是依靠调节阀门进行控制，事实上这种调节方法操作极不方便、又不能保证恒定的供水压力，节能效果差。而如今大部分工厂、企业都已认识到应用变频器确实降低了能耗。节省了成本，尤其再大功率风机、水泵上节能效果更为显著。本文介绍了EV系列变频器在深圳市石岩湖自来水厂应用案例。

　　二、机组参数情况

　　该期工程投入使用共有6台355kw水泵机组，其中3台采用660V电源供电。另3台为10KV高压供电。新莆京SVF-EV变频器应用在两台660V机组上，机组是单机双吸式离心水泵。型号：SC350-440BO、流量：1800米3时、扬程50米、转速1480、功率：365kw/4极。

　　三、控制方式

　　DCS集散系统+人机界面+新莆京EV/660V/355P变频器+PID控制仪+压力传感器。可通过现场和面板以及接触屏进行设定操作启、停、调整运行频率和监控电机的电流、转速、电压、压力、运行时间和故障报警。通过压力变送器将信号传送给PID控制仪，根据设定值与反馈信号的差值进行PID运算后，给变频器一个4-20ma信号，从而保证了恒定的水压输出。

　　四、总结

　　1)采用EV/660V系列变频器对水泵进行节能改造具有结构简单、改造方便、节能效果明显、投资回收期短的特点。

　　2)使用变频器后，水泵可软起软停、减少设备机械冲击、延长设备使用寿命、降低设备的维修费用。

　　3)由于水泵平均转速下降、工作过程中平均转矩减小的原因，叶片、叶轮的磨损也大为减小。维护费用、人工、停产损失大大降低。

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