Circulating improved water turbine cavitation erosion initial state discrimination system and method

Abstract

The invention relates to a circulating improved water turbine cavitation erosion initial state discrimination system and method, and belongs to the field of a water turbine cavitation erosion initial state. The system comprises an in-situ measurement layer, a signal preprocessing layer and a data processing and analysis layer. Cavitation characteristic values are extracted by applying a data fusion technology and an acoustic emission detection technology, and important auxiliary variables such as unit top cover vibration, water pressure pulsation, a water head, a downstream water level, a large-shaft air supply amount and other working condition data are fused to establish a circulating improved cavitation erosion initial state discrimination model, and realize cavitation state identification and cavitation erosion working condition prediction of a water turbine. A situation that runner blades are damaged and forced to rotate for maintenance due to the long-term cavitation erosion working condition of a water turbine set is reduced, the healthy operation level of the water turbine set is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to a discrimination system, in particular to a cycle-improved water turbine cavitation primary state discrimination system, which belongs to the field of hydraulic turbine cavitation primary. Background technique [0002] In recent years, with the construction of large-scale water conservancy projects and the successive completion and commissioning of large and medium-sized hydropower stations, the proportion of hydropower in the entire power grid is increasing, and the safety, stability, and economical problems of hydro turbine operation have become increasingly prominent. [0003] For hydro turbines, cavitation cavitation has always been a difficult and common problem in the industry, which has a very bad impact on the safe operation and efficiency of hydro turbines. First, due to cavitation, the overhaul of many large and medium-sized turbines was forced to be changed from 5-10 years to 2-3 years, and the maintenance cost was r...

AI Technical Summary

Problems solved by technology

[0003]For hydro turbines, cavitation cavitation has always been a difficult and common problem in the industry, which has a very bad impact on the safe operation and efficiency of hydro turbines

First, due to cavitation, the overhaul of many large and medium-sized turbines was forced to be changed from 5-10 years to 2-3 years, and the maintenance cost was relatively high, which brought huge economic losses to the power station

Second, the damage to the flow-passing parts of the turbine has affected the safe and stable operation of the unit: a large amount of dirt and sediment is carried in the water flow during the flood season. The wall will be worn; combined with the inherent cavitation of clean water, the so-called combined effect of cavitation and abrasion will be formed on the flow surface of the turbine, which will aggravate the damage of the flow parts, the efficiency of the unit will decrease, the load fluctuation and strong vibration will seriously threaten the unit. safe operation

Although this patent provides a water turbine cavitation state monitoring system with good safety performance, high efficiency and stable operation, it cannot be applied to existing requirements, and is not as effective as the present application, so it still has defects

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