Papers by Keyword: Pump Station

Abstract: In the summer of southern cities of China, the duration of high temperature becomes longer which requires stricter temperature control and crack prevention measures for mass concrete in construction. By using finite element method for unsteady temperature field and stress field a simulation is made for a pump station built in summer. The cement hydration velocity of this engineering is so high that makes the temperature control very difficulty. Through result analysis of different cases, some optimized measures which include surface preservation and water cooling are proposed. It has an important significance for concrete structure in the same area.

Abstract: Rapid increase of energy consumption greatly restrains China’s sustainable development. Pump station is one of the high consumption systems in national economy. However, issues in design and management like low availability of equipment, unreasonable selection of water pump and no reactive power consumption capacitor lead to waste of energy and low efficiency of pump station, which shall be resolved during innovation of energy saving technology. Beginning with the current status of the pump station and through analyzing current problems, technology improvement measures are put forward in this paper such as expansion of irrigation area and performance adjustment of water pump. The sample evaluation is treated in a normalized way to get the optimal policy for energy saving technology innovation solution and achieve better economic benefits.

Abstract: Taking a pumping station project with large scale centrifugal pumps as working example, an extreme transient flow in the pumping system caused by tripping pump due to electric supply failure was analyzed, and hydraulic disturbance or impulsion to the rest working running pumps were investigated by using the software of the Deltares WANDA 3.73. The results show that the rest running pumps in the system due to a sudden tripping pump disturbance are heavy disturbed when the tripping pump is suddenly failed from the pumping system. The flow rate and input power for the working pumps are greatly jumped shortly. The strongly transient impulsion to the pumping system is quite significant.

Abstract: Atract: Taking the underground powerhouse in a large pumping station as an example, to establish the geometric model of the underground powerhouse structure, and finite element division, analysis of the natural vibration characteristics of the structure, using the method of harmonic response analysis, calculation and analysis to the vibration response of the structure under different conditions. Provide a theoretical basis for the safety evaluation of building structure.

Abstract: In this paper, a model that optimal daily operation(without considering peak and valley price) of single adjustable-blade pump unit in the large pumping station along the Yangtze River is established. Where the minimum cost of energy consumption of single pump unit is set as the objective function, the periods are defined as stage variables, the blade angle is expressed as a decision variable and the daily quantity of delivery water is considered as constraint. The No. 4 Jiangdu Pump Station is taken as a study case. Dynamic programming is adopted to carry out the tidal large pumping station along the Yangtze River. Through this method, under the condition of different water quantity constraint, different average pumping head and different average tidal range amplitude,the influence of the tidal variation on optimal operation of single pump unit in the pumping station is determined. The application results shows that: With the decreased of average pumping head and the increased of average tidal range, the effect of optimal operation of adjustable-blade pump unit in the pumping station along the Yangtze River is getting more and more obvious.

Abstract: Physical and numerical model studies were performed in order to study the flow conditions for the proposed pump station of Shuangwangcheng reservoir, Shouguang Ctiy. The flow velocity and the pressure distribution in the bidirectional culvert of Shuangwangcheng Pump Station had been obtained by hydraulic model test and numerical simulation. The physical model was constructed to a Froude scale of 1:20. A general conclusion was that, the computed results were good agreement with the data measured in physical model, and could be good complement for physical model test. Furthermore, negative pressure existing in discharge steep culvert in the initial scheme design was eliminated by moving the culvert controlling gate to the end of culvert in the modified scheme, and the flow conditions was improved.

Abstract: Considering the contacts between solid and fluid are subjected to dynamic lodes, the influence of vibration characteristic of structure which is coupled with solid and fluid are applied to calculation. In this paper, the calculation formula of structure vibration between solid mass and fluid is derived and the finite element method (FEM) is adopted for discrete of pump station structure and fluid, considering the effect of fluid flow to solid structure, the natural frequency of pump station is acquired. The result shows the method is correct and reasonable.