三元流技术在循环水泵改造中的应用

Application of 3-Dimensional Flow Technology in Modification of Circulating Water Pumps

洛阳石化化纤装置循环水站的6台离心式清水泵,其叶轮是依据二元流理论设计制造的,但二元流理论并不完善,造成泵的实际运行工况偏离额定工况,同时由于存在不同程度的汽蚀现象,致使6台清水泵在较低的效率(75%～80%)下运行。为此,应用三元流技术对清水泵的叶轮进行改造:不改变电机、泵壳体、进出水管路等现有水泵系统,对叶片的进出安放角、叶片数、扭曲叶片各截面形状等进行优化设计,并采用铸焊结构进行加工制造,从而避免叶片工作面的流动分离,减少流动损失,提高叶轮的工作效率,最终达到提高水泵效率、节能降耗的目的。改造后的运行情况表明:机泵运行平稳,噪音减小,汽蚀现象明显减少,泵组效率由改造前的80%提高88.6%;改造后单台泵(流量为5000m3/h)电流降低13A,每年可节电168.48×104kW·h,节省电费67.392万元。

The impellers of six centrifugal pumps in the circulating Sinopec Luoyang Company were designed and manufactured based flaws in 2-dimensional flow theories,the actual operating conditions operating conditions.In addition,due to the existence of different water station for chemical fiber plants in on 2-dimensional flow theories.Due to of these pumps deviated from their rated degrees of cavitation,all the six pumps had been operating with low efficiencies （ranging from 75% to 80%）.Technicians revamped the impellers of the pumps using 3-dimensional flow technology ：making no changes to the existing pump system including motors, the shell of pumps and water inlets and outlets;optimizing design for the inlet and outlet angles of impellers,the number of impellers and the shapes of all sections of twisted impellers ;adopting castweld constructions in processing.These measures could reduce the flow separation on the working face of impellers,reduce flow loss and raise the working efficiency of impellers ,thereby raising the efficiency of these pumps and reducing energy consumption.After the revamp,the pumps operated very well with lower noises and significantly reduced cavitation.The efficiency of the pump set rose to 88.6% from 80% ,the single-pump current dropped by 13A （the flow rate was 5000m3/h） and 168.48×10^4kW·h,or 673920 Yuan of electricity could be saved annually.