深度调峰机组电动给水泵的变频改造节能分析

Energy-saving analysis of the frequency conversion transformation of an electric boiler water feed pump of the deep peak regulation unit

为了改善东北燃煤机组深度调峰运行期间电动给水泵的节流损失,提高电能、煤耗的利用率,以某电厂600 MW电动给水泵组为例,采用变频改造方案,通过分析不同工况(100%、92%、83%、67%、60%、53%、50%额定负荷)下,给水单双泵的工变频情况,得出流量、负荷与电效率、电机有功功率之间的关系。试验结果表明:变频后,流量越低,电效率、电机有功功率提升的越多,最多可达30%、33%;变频改造适用于该机组且能使厂用电率降低0.45%~0.87%,节电率达21%~33%。变频拖动对机组深调峰的节能效果十分显著,为同类型机组的改造提供了借鉴。

To improve the throttling loss of an electric water feed pump during the deep peak shaving operation of northeast coal-fired units,and the utilization rate of electric energy and coal consumption,a 600 MW electric water feed pump unit in power plant is taken as an example,using a frequency conversion scheme,under different working conditions(100%,92%,83%,67%,60%,53%,and 50%rated loads),to analyze the power and frequency conversion conditions of single and double water feed pumps and identify the relationship between the flow rate,load,electrical efficiency,and active power of the motor.The test results show that the lower the flow,the more greater will be the improvements in the electrical efficiency and active power of the motor,up to 30%and 33%,respectively,subsequent to frequency conversion.Frequency conversion transformation is suitable for this unit,reducing the plant power consumption rate by 0.45%~0.87%,the power saving rate is 21%~33%.The variable frequency drive has a significant energy-saving effect on the deep peak shaving operation of the unit,providing a certain degree of reference for the transformation of the same type of unit.