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Tube-Wall Temperature Prediction of a 660-MW Ultra-Supercritical Double-Reheat Boiler under Flexible Peak Shaving

Journal of Thermal Science 2024年第6期33卷 2372-2385页

作者： XU Jiaye FAN Haojie WU Xiaojiang ZHANG Jian YE Nina ZHANG Qichao ZHANG Zhongxiao School of Mechanical Engineering Shanghai Jiao Tong University

Ultra-supercritical double-reheat boilers employ multiple temperature-regulating methods during flexible peak *** exposes the boiler to significant tube-wall temperature deviations and *** this study,a compartment model was developed to subdivide the overlapping high-temperature heating surfaces of a 660-MW double-reheat boiler into smaller *** model was verified using field experimental data and was applied to calculate the enthalpy and tube-wall temperature distributions under different *** addition,the effects of three temperature-regulating methods(swinging burners,regulating dampers,and flue gas recirculation) on the variation tendency and deviations of the tube-wall temperature were *** results indicated that overtemperatures occurred in the high-temperature superheater under a low *** regulating damper method caused the high-temperature secondary reheater to exceed the permissible temperature by 21.4℃.The tube-wall temperature exhibited a bimodal distribution along the *** 0% flue gas recirculation,the maximum tube-wall temperature deviation attained 13.39℃,exceeding a reasonable value by 3.39℃.The swinging burner method was the least likely to cause tube-wall temperature deviations and *** reasonable regulation ranges for swinging burners,regulating dampers,and flue gas recirculation were-20° to 7°,45% to 60%,and 8% to 24%,*** on different flexible peak shaving constraints,an appropriate temperature-regulating method was selected,and the regulation range was specified.

关键词： compartment model double-reheat boiler enthalpy distribution flexible peak shaving tube-wall temperature

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Study on heat source model in twin-arc GMAW with a common weld pool

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China Welding 2009年第3期18卷 7-11页

作者：赵朋成王璐璐刘春廷黄石生 College of Electromechanical Engineering Qingdao University of Science and Technology Qingdao 266061 School of Mechanical and Automotive Engineering South China University of TechnologyGuangzhou 510640

The heat input from arcs to weld pool in twin-arc gas metal arc welding （GMAW） with a common weld pool is investigated by high-speed photography. The characteristics of arc shapes and droplet transfer are studied and then the models for heat flux distribution on top surface of weld pool and enthalpy distribution of metal droplets transferred into weld pool are established. By using the model, 3-D geometries of weld pools in twin-arc GMAW with a common weld pool are predicted. Corresponding welding experiments on mild steel plates are carried out and the results indicate that the predicted shape of weld bead on cross section shows good agreement with measured one.

关键词： droplet transfer heat source model enthalpy distribution twin-arc GMAW

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