scholarly journals The design of a circulating water pump for a power plant based on CFD

2020 ◽  
Vol 194 ◽  
pp. 03026
Author(s):  
Wanbo Chen
Keyword(s):  
Power Plant ◽  
Guide Vane ◽  
Flow State ◽  
Water Pump ◽  
Mixed Flow ◽  
High Discharge ◽  
Circulating Water ◽  
Cfd Method ◽  
Flow Pump

Because of the head and efficiency of the circulating water pump in a power plant could not satisfy application requirement, the guide vane and impeller were optimized according to the CFD method. The optimization of the mixed-flow pump effectively improves the flow state at the design and high discharge conditions. Finally, the CFD results show that the head is improved by 3.49m and the efficiency is improved by 3.16% after the optimization, which has met the use requirements.

Study on 3-D Flow Field of Concrete Volute Conduit of Circulating Water Pump in Nuclear Power Plant

2011 ◽  
Vol 99-100 ◽  
pp. 350-353
Author(s):  
Xiao Bing Sun ◽  
Xu Bin Qiao
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Gradual Change ◽  
Water Pump ◽  
Pump System ◽  
Circulating Water ◽  
Operating Modes

As the largest unit capacity of nuclear power plant at present, the flow conduit of circulating water pump in EPR1750 nuclear power plant is a volute conduit, which is a cast-in-situ conceret structure with complexly gradual change cavity. Therefore, the hydraulic efficiency of circulating water pump is not only related with the design of pump leaves, but also closely related to the design of volute and the complicated spatial type of intake and outtake conduits. With the pump leaves and the intake and outtake conduits of conceret volute as the research model, based on computational fluid dynamics (CFD)and the three dimensional Reynolds averaged Navier-Stokes equations, an analytic model suitable for computation is established to simulate the three-dimensional steady flow in the whole pumping system under different operating modes. By use of the commercial fluid-computation softer ANSYS, the distribution of basic physic quantities in the fluid field inside the pump and the conduits is obtained. The analysis and prediction of the performance of pump system are made, and the spatial type design of intake and outtake conduits is evaluated. The calculation results can be referenced to improve the design of pump systems in the similar projects.

scholarly journals Failure Analysis of Shaft Circulating Water Pump (CWP) used in Power Plant

2018 ◽  
Vol 159 ◽  
pp. 02027 ◽  
Author(s):  
Abdul Hamid ◽  
Sri Nugroho ◽  
Gunawan Dwi Haryadi ◽  
Khaeroman
Keyword(s):  
Stainless Steel ◽  
Chemical Composition ◽  
Power Plant ◽  
Failure Analysis ◽  
Fatigue Cracking ◽  
Hardness Test ◽  
Water Pump ◽  
Circulating Water ◽  
Pump Shaft ◽  
Sem Test

Pump shafts are generally exposed to the liquid being pumped either on a continual basis or at certain locations along the length of the shaft. The shaft material is austenitic stainless steel, description ASTM AU 79 TY 316. The purpose of this study is to determine the failure of the water pump shaft used in the power plant. Metallography is the study of structure metal shaft can used as a means for CWP metal pelleting (Circulating Water Pump), for the purpose of damaged or deeply degraded areas. SEM test is used to know the beginning of the crack (crack initiation). EDS test is used to chemical composition and Vikers hardness test is also used to know the hardness material. These three tests to support in analyzing the failure of the pump shaft. The conclusion of this failure analysis is the shaft material has porosity. Fatigue cracking comes from the outer surface area.

scholarly journals Vortex Dynamics Analysis of Internal Flow Field of Mixed-Flow Pump under Alford Effect

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3575
Author(s):  
Shuo Li ◽  
Wei Li ◽  
Leilei Ji ◽  
Weidong Shi ◽  
Ramesh K. Agarwal
Keyword(s):  
Flow Field ◽  
Vortex Core ◽  
Guide Vane ◽  
Internal Flow ◽  
Tip Leakage Flow ◽  
Mixed Flow ◽  
Tip Leakage ◽  
L1 And L2 ◽  
The Impact ◽  
Flow Pump

A multi-region dynamic slip method was established to study the internal flow characteristics of the mixed-flow pump under the Alford effect. The ANSYS Fluent software and the standard k-ε two-equation model were used to numerically predict the mixed-flow pump’s external characteristics and analyze the forces on the impeller and guide vane internal vortex structure and non-uniform tip gap of the mixed-flow pump at different eccentric distances. The research results show that the external characteristic results of the numerical calculation are consistent with the experimental measurement. The head error of the design flow operating point is about 5%, and the efficiency error is no more than 3%, indicating the high accuracy of numerical calculation. Eccentricity has a significant influence on the flow field in the tip area of the mixed-flow pump impeller, the distribution of vortex core in the impeller presents obvious asymmetry, the strength and distribution area of the vortex core in the small gap area of the tip increase obviously, which aggravates the flow instability and increases the energy loss. With the increase of eccentricity, the strength and number of vortex core structures in the guide vane also increase significantly, and obvious flow separation occurs near the inlet of the guide vane suction surface on the eccentric side of the impeller. The circumferential distribution of L1 and L2 values represents the friction pressure gap in the eccentric state, and the eccentricity has a more noticeable effect on L1 and L2 values at the small gap; With the increase of eccentricity, the values of vorticity moment components L1 and L2 increase, and the Alford moment on the impeller increases. The leading-edge region of the blade is the main part affected by the unstable torque of the flow field. With the increase of eccentricity, the impact degree of tip leakage flow deepens, and the change of the tip surface pressure is the most obvious. The impact area of tip leakage flow is mainly concentrated in the first half of the impeller channel, which has an impact on the blade inlet flow field but has little impact on the blade outlet flow field.

scholarly journals Influence of impeller and guide vane hub size on hydraulic performance of mixed-flow pump

2019 ◽  
Vol 240 ◽  
pp. 032012
Author(s):  
Wenpeng Zhang ◽  
Fangping Tang ◽  
Sheng-ying Zhou ◽  
Lijian Shi ◽  
Ye Xia
Keyword(s):  
Guide Vane ◽  
Hydraulic Performance ◽  
Mixed Flow ◽  
Flow Pump

Security Reliability Analysis of Circulating Water Pump House Pit Excavation of Chen Jiagang Power Plant

2013 ◽  
Vol 353-356 ◽  
pp. 229-234
Author(s):  
Jian Pan ◽  
Xiao Yong Ding
Keyword(s):  
Power Plant ◽  
Taylor Series ◽  
Feedback System ◽  
Successful Implementation ◽  
Series Method ◽  
Water Pump ◽  
Foundation Pit ◽  
Circulating Water ◽  
Taylor Series Method ◽  
Pump House

The circulating water pump house pit excavation of Chen Jiagang power plant is characterized with complex geological and hydrological condition, high water level, and weakly permeable silt layer within the scope of pit excavation. Based on design and construction principles of safety, feasibility, rationality and economy, different foundation pit dewatering and support programs were analyzed and compared, a excavation method featured with well dewatering and steel pipe soil nails hanging net and stakes was elaborately designed, and establish a monitoring feedback system. And in the base of mathematical statistics, Taylor series method is used to analyze the reliability probability problems of excavation slope stability analysis. The successful implementation of the project indicated that the design and parameters of Chen Jiagang power plant circulating water pump house pit excavation is feasible, and Taylor series method combined with conventional safety factor is able to analyze the influence of material parameters variation on the excavation of the slopes safety.

scholarly journals Economic Operation Analysis of Circulating Water Pump in a Power Plant

2019 ◽  
Vol 118 ◽  
pp. 02067
Author(s):  
Shuai Chen
Keyword(s):  
Power Plant ◽  
Flow Rate ◽  
Test Results ◽  
Water Pump ◽  
Circulating Water ◽  
Operation Analysis ◽  
Economic Operation ◽  
Shaft Power ◽  
Technical Specifications

This paper calculates the main indexes of circulating water pump in a power plant, such as flow rate, head, shaft power and efficiency, and shows the test results. The results reach the guaranteed value of design technical specifications.

Modelling of Incompressible Three-Dimensional Flow in Rotating Turbomachinery Passages

2002 ◽  
Author(s):  
C. Cravero ◽  
A. Satta ◽  
M. Marini
Keyword(s):  
Compressible Flows ◽  
Incompressible Flows ◽  
Three Dimensional ◽  
Inviscid Flow ◽  
Mixed Flow ◽  
Three Dimensional Flow ◽  
Pump Impeller ◽  
Preconditioning Technique ◽  
Cfd Method ◽  
Flow Pump

A CFD method, previously developed by the authors for compressible flows, has been modified through a preconditioning technique to account for purely incompressible flows. Such a code is used to compute three-dimensional flows in a mixed flow pump impeller at design and off-design conditions. The results of the inviscid flow approach are critically discussed by comparison to available experimental data.

Optimization of Condenser Vacuum Based on Neural Network and SA-BBO

2013 ◽  
Vol 860-863 ◽  
pp. 676-679
Author(s):  
Lei Zhang ◽  
Ya Lan Ye ◽  
Feng Qi Si
Keyword(s):  
Neural Network ◽  
Power Plant ◽  
Hybrid Algorithm ◽  
Market Value ◽  
Operating Conditions ◽  
Steam Turbines ◽  
Water Pump ◽  
Characteristic Analysis ◽  
Circulating Water ◽  
Save Energy

The optimization of condenser vacuum is significant to improve efficiency and save energy in the power plant. Taking a 600MW unit as the research object, the condenser vacuum optimization model was established synthetically based on neural network, simulated annealing and biogeography optimization hybrid algorithm (SA-BBO). Circulating pumps power, slight increase of turbine power as well as the market value difference between coal and electric were included in the model. The objective function of the model is to maximize the profit of the power plant. The most effective combinations of the condenser vacuum and the circulating water pump were calculated eventually in different operating conditions by using characteristic analysis of variable condenser conditions. In a certain condition, running three circulating pumps for two steam turbines instead of two pumps can make the condenser vacuum reduce 0.49kPa, and increase revenue 110.2 yuan/h.

Large Eddy Simulation of Unsteady Flow in a Mixed Flow Pump Guide Vane

2013 ◽  
Vol 444-445 ◽  
pp. 555-560 ◽  
Author(s):  
Yi Bin Li ◽  
Ren Nian Li ◽  
Xiu Yong Wang
Keyword(s):  
Large Eddy Simulation ◽  
Unsteady Flow ◽  
Pressure Fluctuation ◽  
Guide Vane ◽  
Suction Surface ◽  
Mixed Flow ◽  
Eddy Simulation ◽  
Large Eddy ◽  
Small Flow ◽  
Flow Pump

In order to investigate the characteristics of unsteady flow in a mixed flow pump guide vane under the small flow conditions, several indicator points in a mixed flow pump guide vane was set, the three-dimensional unsteady turbulence numerical value of the mixed flow pump which is in the whole flow field will be calculated by means of the large eddy simulation (LES), sub-grid scale model and sliding mesh technology. The experimental results suggest that the large eddy simulation can estimate the positive slope characteristic of head & capacity curve. And the calculation results show that the pressure fluctuation coefficients of the middle section in guide vane inlet will decrease firstly and then increase. In guide vane outlet, the pressure fluctuation coefficients of section will be approximately axially symmetrical distribution. The pressure fluctuation minimum of section in guide vane inlet is above the middle location of the guide vane suction surface, and the pressure fluctuation minimum of section in which located the middle and outlet of guide vane. When it is under the small flow operating condition, the eddy scale of guide vane is larger, and the pressure fluctuation of the channel in guide vane being cyclical fluctuations obviously which leads to the area of eddy expanding to the whole channel from the suction side. The middle of the guide vane suction surface of the minimum amplitude pressure fluctuation to which the vortex core of eddy scale whose direction of fluids rotation is the same to impeller in the guide vane adhere.

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