关键词: 凝结水泵, 变频改造, 耗电率, 给水泵, 密封水, 控制逻辑, 保护逻辑

Abstract: In this paper, the analysis on the high power consumption of the condensate pump in the 1 000-MW unit of Huadian Zouxian Power Company is conducted. The major cause is then concluded as the rotating speed of the condensate pump motor inverter reduced to its lower limit in order to ensure the safety margin of the seal water pressure of the boiler feed water pump . Therefore, the booster pump is added to the seal water pipeline and meanwhile, the related control and protection logics are optimized. After such innovation and adjustment, the motor inverter can run safely and economically between 0% and 100% load ranges with the power consumption rate of the condensate pump reduced by about 0.2 percent and the coal consumption rate reduced by 0.7 g/(kW·h), which demonstrates significant economic benefits.

Key words: condensate pump, frequency conversion transformation, power consumption rate, feed water pump, sealing water, control logic, protection logic