炼油厂的水源加压泵、循环水泵、污水泵的选型,即使采用了大小泵匹配,其水量、扬程也还会因用水量或排水量的变化而比要求的扬程缩大、偏高。因此,可采用水泵调速装置以达到节能目的。据统计,在正确选择机泵及其进行调整等节电措施后仍有10～15％的电能消耗在节流阀门和过高的余压上。目前常用的水泵调速方法有两种。 The water source pressure pump, circulating water pump, and sewage pump of the refinery are selected. Even if a large and small pump is used for matching, the amount of water and the head of the refinery will also be larger and higher than the required lift due to changes in the amount of water or displacement. Therefore, the water pump speed control device can be used to achieve the purpose of energy saving. According to statistics, 10 to 15% of the electric energy is still consumed in throttle valves and excessive residual pressure after the correct selection of the pump and its adjustment and other power-saving measures. There are two types of commonly used water pump speed control methods.