Shenyang Getai Hydropower Equipment Co., Ltd.

Turbine Wear Repair

Jan. 07, 2020

Sediment is an important issue for hydropower stations. It not only wears and damages the power plant unit components, but also reduces the unit efficiency, and ultimately affects the power generation capacity of the power plant. Failure to restore it through thorough repairs will lead to increased power station operation and maintenance costs.

In recent years, a large number of laboratory and field tests have been conducted on the mechanism of silt abrasion at home and abroad, and various technical measures to prevent silt abrasion of hydraulic turbines. A lot of results have been achieved. Some Hydraulic Turbine Generator China on the Yellow River in China have also accumulated successful experience in repair welding and repairing of runners, and overcoating of non-metallic materials with resistance to mud and abrasion of runner blades. However, the problems in the sand and sand wear field of hydraulic turbines are still very large, and further research is needed, especially to eradicate the serious hazards caused by sand and sand wear and tear to the operation of hydraulic turbines. It is necessary to improve the The anti-wear performance of hydraulic turbines working in water flows, the development of metal and non-metal materials with high resistance to mud and sand wear, and other comprehensive technical measures can be used to achieve this goal.

Pelton Turbine Generator 

Hazards of water turbine cavitation:

The damage of hydro-cavity to the hydropower station is relatively large, it will not only affect the normal operation of the unit, but also reduce the operating life of the unit. It mainly causes damage to the turbine's over-current components, Casting Guide Vane, runners, tailpipes, etc.

Because cavitation will disturb the normal operation of the water flow and energy conversion, increasing the leakage and hydraulic loss of the water flow will directly reduce the output and efficiency of the turbine. Once severe cavitation occurs, it will cause strong vibration, noise, The fluctuation of output caused the unsafe operation of the unit, which increased the frequency and complexity of the unit's maintenance. At the same time, the cavitation and cavitation maintenance not only increased the consumption of steel, but also increased the construction period, which had a serious impact on power production.

Destructive effects of water turbine cavitation:

Cavitation is mainly the erosion of the surface of metal materials. It includes three functions: mechanical, chemical, and electrochemical. Polymer elastic and rigid wear-resistant materials are based on silicon steel alloy and mixed with alumina silicon carbide and other components. Shore 85 hardness, flexible silicon carbide repair material has the lack of concession that metal lacks. It can effectively resist cavitation and sediment erosion and protect the impeller body. The original state of the silicon carbide repair material is paste. Filling and repairing of various shapes can be done at will. The smooth and flat surface after repairing can significantly improve the efficiency of the turbine, avoid thermal deformation caused by welding and make the turbine run more smoothly. The repair time of a single turbine can be completed in one day. The material can triple the life of the turbine blade, and the normal temperature operation during the repair process avoids thermal stress caused by welding.

The above is the relevant introduction about the repair of turbine wear.

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