大型电站离心泵的节能设计

Energy- saving design of centrifugal pump in large hydropower station

针对某电站高扬程离心泵改造项目客户所提出的增加流量扬程、节能增效,而且设备安装尺寸不变的要求,运用UG三维建模及CFD数值模拟技术,对叶片翼型和流场进行了分析;并结合传统的设计理论和经验,选择合适的方法,从多个方面对设备进行改进,比如加大叶轮直径及出口宽度,调整叶轮前盖板及导叶体壳体尺寸,修改叶轮叶片及导叶体叶片的几何形状,以降低水力损失并符合流量扬程要求。通过多次分析及改进,在要求的流量扬程工况点,模拟的水力效率得到了明显提高,最终试验达到了预期目的,产品完全满足客户要求。

In a high lift centrifugal pump improvement project, it is required to increase the flow, head and energy - saving efficiency with fixed installation dimensions. The vane airfoil and flow field are analyzed by applying UG 3D modeling and CFD numerical simulation technology. With consideration of the traditional design theory and experience, the improvement is conducted by selecting suitable methods, i.e. , increasing the impeller diameter and exit width, adjusting the sizes of impeller front shroud and diffuser casing, modifying the geometrical shape of impeller vane and guide vane, so as to reduce the hydraulic loss and meet the requirements of flow and lift. Through repeated analysis and improvement, the simulated hydraulic efficiency is obviously improved at the required operating point of flow and head. The final test has met the requirements as expected.