基于DCS系统变频循环水泵节能自动控制

DCS-Based Energy-Saving Automatic Control on Variable-Frequency Circulating-Water Pump

以运行机组DCS系统为基础,介绍了一种变频循环水泵节能自动控制的实现方法。从节能自动控制的理论和原理出发,通过实时计算凝汽器的运行清洁系数,采用循环重复计算法求取凝汽器最佳真空及对应的变频循环水泵运行方式,对比分析并确定节能自动控制的实现方案,详细阐述了建立节能自动控制系统的注意事项以及实现过程中遇到的问题及解决方法,以某电厂330 MW热电联产机组为例进行了测算,实施变频循环水泵节能自动控制后年可节电376.16万kW·h。

Based on the DCS system for operating units, a method to realize the automatic control on the energy saving of variable frequency circulating-water pump is introduced. From the viewpoint of automatic control theory, the optimal condenser vacuum and the corresponding operation mode of the pump are obtained through the calculation of real-time condenser clean coefficient with the repeated cycle method. Then by comparison and analysis the implementation plan is determined for the energy-saving automatic control in which the matters needing attention in establishing the automatic control system as well as the issues and solutions in the implementation are proposed in details. Finally, the calculation on a 330-MW cogeneration unit is conducted, which concludes that the power consumption of the pump will decrease by 3 761.6 MW·h after the automatic control is implemented.