Author:
Wang Yongfei,Li Xiaofei,Wang Tong,Zhang Jian,Li Longcheng,Zhang Yu
Abstract
AbstractThe radiator with heat transfer capability is able to guarantee the stable operation of hydro generator set, while the long-term and continuous scouring on radiator pipes by cooling medium will lead to thinning or even perforation of pipe wall, which triggers wall failure. This paper analyzes and predicts the failure mechanism of radiator’s pipe wall, and investigates the effects of water flow velocity, sand content and sand particle size on erosion damage of radiator pipe by establishing a test bench for pipe erosion. The results show that the increase of above parameters will lead to the increasing erosion rate, especially when the sand content is 1%, the velocity is 8 m/s and the sand particle size is 0.85 mm, the erosion damage will be particularly serious. Based on experimental data, BP and LSSVM models are employed to predict the pipe wall failure, and PSO algorithm is used to optimize the two models. The optimized PSO-BP has the highest accuracy with the mean absolute error (MAE) of 0.2070 and the mean absolute percentage error (MAPE) of 4.702%. The findings provide a reference for wall failure analysis of radiator, which is of great significance for unit's safe operation.
Funder
National Natural Science Foundation of China
Publisher
Springer Science and Business Media LLC
Reference33 articles.
1. Dang, D. D. et al. CFD analysis of turbulent convective heat transfer in a hydro-generator rotor-stator system. Appl. Therm. Eng. 130, 17–28 (2018).
2. Goričanec, D., Pozeb, V., Tomšič, L. & Trop, P. Exploitation of the waste-heat from hydro power plants. Energy 77, 220–225 (2014).
3. Milić, S. D., Žigić, A. D. & Ponjavić, M. M. Online temperature monitoring, fault detection, and a novel heat run test of a water-cooled rotor of a hydrogenerator. IEEE Trans. Energy Convers. 28(3), 698–706 (2013).
4. Frota M N, Hernández-Vásquez J, Castro-Pacheco E, Germano S, Jr J B. Enhancing the effectiveness of hydro generator heat exchangers through the control of measurement uncertainties. XIII Heat Exchanger Fouling and Cleaning Conference, Warsaw, Poland. (2019).
5. Frota, M. N. et al. On-line cleaning technique for mitigation of biofouling in heat exchangers: A case study of a hydroelectric power plant in Brazil. Exp. Therm. Fluid Sci. 53, 197–206 (2014).