Multistage centrifugal pump impeller cutting method to reduce energy consumption

The working principle of multistage centrifugal pump is that the fluid flowing through the impeller is influenced by centrifugal force through the impeller to increase the mechanical energy of the fluid and is used for overcoming the mechanical energy loss along the fluid conveying. The energy saving and retrofit measures taken are generally frequency conversion and impeller Cutting. But there are limitations of frequency control, investment, high maintenance costs, and when multi-stage centrifugal pump speed is too large will cause the operating efficiency decline.

Multistage centrifugal pumps account for the largest number of pumps of all types and are the major fluid delivery devices in the petrochemical industry. In the past when designers use centrifugal pumps, often leave a larger design margin.

In contrast, the impeller cutting method is simple and convenient to implement, and the cost is small and quick, only need to calculate the pump impeller cutting the implementation of cutting transformation, after calculation and evaluation of economic rationality can be put into operation. Change the pump structure to cut the impeller, reduce power to save energy program. After an impeller cut, the pump impeller diameter from the original 324 mm cut into 290 mm, while the head down from 140 meters to 112.16 meters, cutting power of 79.9 kW, the power down 30.1 kW, the flow of 183.3 ~ 222.4 cubic meters / Hour, to meet the needs of the scene craft.

Under the guidance of successful experience, technicians further promote the method of cutting impeller and adopt standardized, procedural and standard means. This type of multi-stage centrifugal pump has been implemented a total of 15 units, saving 10,836 kWh.

According to incomplete statistics, the annual power consumption of various types of multistage centrifugal pumps is 8.65 million kwh, and the electricity consumption after the renovation is reduced to 8.22 million kwh. The annual economic benefit of 220,000 yuan can be obtained. Thus, the implementation of multistage centrifugal pump cutting transformation is an important technical measure for enterprises to reduce "Malaysia", improve operational efficiency and reduce energy consumption.