Selection And Optimization Of Pump System In Hangtang Port Pump Station

Shanghai Hangtang Port Pumping Station is a new one-way drainage pumping station,it directly protect the economically developed Shanghai plain area,densely populated,belongs to the "particularly important" protection of the town.The design flow of the pumping station is 60m3/s,and the net head is 0.0m～3.87m.The main building,such as pumping station,is a class 1 hydraulic building,and the structure of the pump house is complex and large in scale,and there are many factors affecting the structure type.Pump device is the core component of the whole pumping station,in order to ensure that the pumping station can be safe and efficient operation,the hydraulic performance of the pump device of Hangtang Port pumping station needs to be further studied.In this paper,based on the basic parameters of Hangtang Port pumping station,the pumping unit of Hangtang Port is studied from the two perspectives of pump model selection and flow channel optimization,and the results of the study are tested through pumping unit model tests.The main research contents and results are as follows.The pump models of Hangtang Port were selected,mainly including "S" shaped axial extension pump,vertical axial flow pump,vertical shaft cross-flow pump,inclined axial flow pump and submersible cross-flow pump.According to the characteristics and advantages and disadvantages of the five pumping devices,the most suitable pumping device for the Hangtang Port pumping station was selected,and the inclined 30° axial flow pumping scheme was recommended by the comparison analysis.The number of main pumps is compared,and according to the production capacity of the pumps and the specific conditions of the project,4 machines are recommended for this project.According to the requirements of pumping station head and flow rate,the three axial flow pump hydraulic models available in the same test results of the Ministry of Water Resources in Tianjin were selected and converted respectively according to the model test results of similar inclined axial flow pumping stations already built.Comparing the head,efficiency and cavitation performance of each unit at the minimum flow rate,design flow rate and maximum flow rate required by the Hangtang Port pumping station,the hydraulic model TJ04-ZL-23 was selected on a comprehensive basis,with the prototype pump impeller diameter of 2200 mm and speed of 172 r/min.Based on the hydraulic model TJ04-ZL-23 and its supporting rear guide vane,numerical calculation and optimization of the inclined axial flow pump unit were carried out.Through orthogonal test design,four factors were selected:inlet channel length L,inlet channel width B,throat height Hk,and turning radius R.It was found that the throat height has the greatest influence on the evaluation index.The impact of the outlet height of the bend section of the straight pipe outlet channel on the performance of the pump unit was studied.It was found that when the outlet height of the bend section was reduced by a small amount,it had a good rectification effect.Numerical simulations of the optimized scheme showed that the design flow rate of 15 m3/s at+2°resulted in a head of 3.57 m and an efficiency of 76.43%,while the flow rate of 16.5 m3/s resulted in a head of 3.02 m and an efficiency of 78.5%,which is a good optimization effect.The optimized Hangtang Port pumping unit was subjected to model tests,and the energy,cavitation curve,pressure pulsation and flyaway characteristics data of the model pumping unit of Hangtang Port pumping station project under five vane angles were obtained.The head is 3.18 m and the efficiency is 77.03%when the model design flow rate is 280 L/s under the placement angle of 0° is obtained.In order to operate the pump unit at the highest efficiency operating point,the prototype pump speed is recommended to be 178 r/min and the design vane settling angle is 0°.The test results are good and can be applied in engineering.