我单位有5台蒸汽锅炉,蒸汽用量35000t/a,由一台10t/h的水泵集中供水,电机功率18.5kW,连续运转,给水压力1MPa,供水能力80000t/a。由于用水量波动大,不能选用小容量水泵,所以大多数时间50%以上的水由阀门控制返回储水罐,造成电能浪费。我们用一台日本三垦22kVA变频器对水泵做调速控制,实现了按需恒压给水。大多数时间运行时,频率在30～40Hz之间自动调整,由于转速下降,噪声、发热显著降低,机械磨损减少,5年的 My unit has 5 steam boilers, steam 35000t / a, by a 10t / h pump centralized water supply, motor power 18.5kW, continuous operation, water pressure 1MPa, water supply capacity 80000t / a. Due to large fluctuations in water consumption, can not choose a small capacity pump, so most of the time more than 50% of the water by the valve control back to the water tank, resulting in wasted energy. We use a Japanese Sanken 22kVA converter to speed control of the pump, to achieve a constant pressure water supply. Most of the time running, the frequency automatically adjusts between 30 ~ 40Hz, due to the decline in speed, noise, heat significantly reduced, reduced mechanical wear and tear, 5 years