基于非设计工况运行的卧式水轮机增效扩容技术研究OA

To solve the problems such as runner cracks,aggravated cavitation,and relatively low efficiency caused by the long-term operation of horizontal-shaft Francis hydroturbines in the high-head range and the mismatch between the original design parameters and the actual operating conditions in a hydropower plant,and to achieve the efficiency improvement and capacity expansion of the hydroturbines,the key parameters such as rated head and output of the hydroturbines,were optimized based on the actual operation data of the hydropower plant.Based on the actual operation range,the runners matching the operating head parameters and having better performance were selected,and the material upgrade and structural retrofitting were carried out on core components such as the volute and gate operating mechanism.After the retrofitting,the efficiency of hydroturbines is improved,the high-efficiency operation range closely matches the main operating head range of the hydropower plant,and the efficiency of hydroturbines under rated conditions is increased to 92.02%,significantly improving hydroturbine operation stability and economic benefits under main operating conditions.This study establishes a technical route for efficiency improvement and capacity expansion of horizontal-shaft Francis hydroturbines based on operation data analysis,combined with parameter optimization and component retrofitting.It can provide engineering reference for the retrofitting of similar hydroturbines under high head operating conditions.