The main technical innovations use the theory of surface erosion of rubber sand wheel polishing blades to tell us that the smoother the surface of the blade, the less likely it is to generate cavitation and the lighter the degree. Therefore, in the last process of the surface treatment of the blade, rubber sand wheel polishing is used to increase the surface finish of the blade, and the anti-cavitation performance of the blade is remarkably enhanced. Theoretical study on the density L/t value of the cascade and careful selection of the blade airfoil: After detailed inspection of the original blade airfoil, combined with the actual head, flow and flow path of the power station, a modification plan is proposed. The blade airfoil was redesigned. The airfoil was tested by the manufacturer, and the airfoil cavitation of the blade was significantly reduced. The theoretical study on the density L/t of the cascade was carried out. The overcurrent performance, rotational speed, efficiency and cavitation performance of the turbine were calculated and analyzed. The impact of the L/t value on turbine over-current performance, rotational speed, efficiency and cavitation performance. Therefore, when replacing the stainless steel blades, the cascade L/t size of the cascades was recalculated, analyzed and selected in combination with the actual conditions of the screw and the operation of the unit, and was approved by the design manufacturer. The L/t value was increased from the original 1.83 to 1.86. The actual operation results after replacing the stainless steel blades proved that the size of the cascade density L/t was suitable.
Optimized processing technology The screw plant has been fully operational in 1992 for more than 10 years, but the engineers and technicians of the power plant have not stopped exploring and researching the turbine cavitation treatment process, such as redesigning the blade airfoil, replacing the stainless steel blades, New materials and new processes have been used for repairs. The actual operation check shows that the series of measures taken have achieved obvious results and produced the following good economic benefits. The turbine erosion damage of the turbine is significantly reduced. The blade is basically free of cavitation damage, including the front surface of the blade that is easily cavitation, the water outlet at the back, and the cavitation damage of the blade bolt, the blade root and the runner chamber. The unit operating efficiency is improved. The original design head of the unit is 11.5m and the output is 10500kW. According to the analysis and demonstration by Dongfang Motor Factory, when the water head is increased to 13.4m, the maximum output of the unit can reach 12000kW. The comparison results show that before the replacement of the stainless steel blades, the output of the unit When the temperature reaches 11000 kW, the vibration, swing and noise are unqualified; after replacing the stainless steel blades, under the same head and water level conditions, the vibration, swing and noise of the unit reach a good standard when the unit output is running at 11000 kW. The vibration, noise and swing of the unit are reduced. When the unit is running under rated conditions, the horizontal vibration of the hydro-generator unit is reduced by 0.04mm, the vertical vibration is reduced by 0.06mm, the swing is reduced by 0.03mm (double amplitude), and the noise is reduced by 5dB. Economic and social benefits Luoji invested 1.95 million yuan, replaced the cast steel blades of three hydro-generator sets with stainless steel blades, made turbine runner blade profile inspection samples and repaired with TS216 cavitation repair agent. The series of active and effective measures reduce the vibration and noise of the unit, reduce the cavitation damage, and prolong the overhaul period of the unit, thereby improving the unit efficiency and generating a large amount of electric energy.
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