Junyu Tao , Ziqiang Du , Xu Zheng , Zhe Lin , Guang Zhang
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引用次数: 0
Abstract
The high-temperature mixing valve is widely used in petrochemical flue gas treatment systems to precisely control the inlet temperature; however, its internal flow and thermal fluctuation characteristics have not been sufficiently studied. The Detached Eddy Simulation (DES) method is employed in this study to analyze systematically the mixing mechanism of cold and hot fluids, temperature profile, flow field distribution, and vorticity distribution within the mixing valve. It is found that as the valve opening rises, the throttling effect decreases, and the distribution of high-temperature gas varies from the valve body center region to the entire valve chamber. The direction of the high-temperature jet on the downstream side of the valve core is shifted toward the main flow direction. Furthermore, the extension, rupture, and merging of different types of turbulence vortices within the valve significantly improve heat exchange efficiency. The study also predicts thermal fatigue failure is likely to occur in the lower regions on both sides near X = 250 mm of the valve core at valve openings of 0.2L and 0.4L . This research provides new theoretical support for the design optimization of high-temperature mixing valves, which helps to improve the thermal efficiency of flue gas treatment systems, extend equipment lifespan, and increase overall reliability.
期刊介绍:
International Journal of Heat and Mass Transfer is the vehicle for the exchange of basic ideas in heat and mass transfer between research workers and engineers throughout the world. It focuses on both analytical and experimental research, with an emphasis on contributions which increase the basic understanding of transfer processes and their application to engineering problems.
Topics include:
-New methods of measuring and/or correlating transport-property data
-Energy engineering
-Environmental applications of heat and/or mass transfer