Influencia en el ranurado interno de un tubo receptor sobre la generación directa de vapor, deformación y esfuerzos térmicos
Influencia en el ranurado interno de un tubo receptor sobre la generación directa de vapor, deformación y esfuerzos térmicos
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DOI: https://doi.org/10.22533/at.ed.5022429053
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Palavras-chave: Tubo ranurado, Receptor tubular, Torre solar, Generación directa de vapor, Estrés térmico, Deformación
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Keywords: Grooved tube, Tubular receiver, Solar tower, Direct steam generation, Thermal stress, Deformation
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Abstract: This study focuses on the analysis of a passive strategy through the use of grooves, aimed at mitigating the thermal gradients present in standard, smooth solar receiver tubes, thereby improving their structural stability. The research involves a comparison between two tubes: one smooth, of conventional type, and another grooved. These tubes are representative of the external tubular receivers used in central tower systems, which operate through direct steam generation (DSG), under non-uniform solar concentration, reaching a maximum value of 0.93 MW/m². Additionally, a subcooled mass flow of 0.678 kg/s at 472 K and a pressure of 4.5 MPa are analyzed. The comparison encompasses temperature fields, thermal gradients in the tube wall, states of subcooling and superheating, detection of the onset of nucleate boiling and net vapor generation, as well as deformations and thermal stresses for each system. The results reveal that the grooved tube achieves a significant reduction in both thermal gradients and maximum temperature, with decreases of 27% and 130 K, respectively; thermal stresses are reduced by 33%, pressure drops by 20%, and the quality of the vapor at the outlet is maintained (11%). It is concluded that grooves, strategically placed inside the tube, offer a viable solution for operating the tubular receiver with greater structural safety and thermal efficiency, without compromising steam generation. This contributes to the increased durability of these solar technologies.
- Victor Manuel Maytorena Soria
- S. Moreno
- R.L. Duran
- J.F. Hinojosa