Thermo-exergetic evaluation of a compact pyrotubular steam generator

Velázquez-González Alejandro, Corrales-Suárez Jorge Michel, Pérez-Molina Leonardo Rafael

Article ID: 1521
Vol 4, Issue 2, 2021

VIEWS - 276 (Abstract) 256 (pdf)

Abstract


One of the most important variables to know how efficient a thermal machine is the exergy. In practice, it is one of the least controlled variables. In this research, a thermal exergy study was carried out in a compact pyrotubular steam generator. To achieve this, an energy mass balance and entropy balance were carried out. The energy balance was carried out by direct and indirect methods. The percentages of the exergies of each working substance in the process are specified. The energy yield by the direct method was 0.901 and by the indirect method was 0.882, since each method has its role in the energy analysis. The irreversibilities in the process were 26%. The exergetic efficiency was 0.39, conditioned by a complete combustion in the hearth. It was demonstrated that the steam generator for the real operating conditions is oversized.

Keywords


Pyrotubular Steam Generator; Energy; Entropy; Exergy; Irreversibilities; Performance

Full Text:

pdf


References


1. Kitto JB, Stultz SC. Steam: Its generation and use. Ohio: The Babcock & Wilcox Company; 2005.

2. Dincer I, Rosen MA. A worldwide perspective on energy, environment and sustainable development. International Journal of Energy Research 1998; 22(15): 1305–1321.

3. Lozano MA. Metodología para el análisis exergético de calderas de vapor en centrales térmicas (Spainish) [Methodology for the exergetic analysis of steam boilers in thermal power plants]. Zaragoza; 1987.

4. Ayhan B, Demirtas C. Investigation of turbulators for fire tube boilers using exergy analysis. Turkish Journal of Engineering and Environmental Sciences 2001; 25(4): 249–258.

5. Sami S, Etesami N, Rahimi A. Energy and exergy analysis of an indirect solar cabinet dryer based on mathematical modelling results. Energy 2011; 36(5): 2847–2855. doi: 10.1016/j.Energy.2011.02.027.

6. Rodríguez NG. Catálogo de especificaciones de productos rama combustibles (Spainish) [Catalog of fuel branch product specifications]. La Habana; 2014.

7. Çengel YA, Boles MA. Termodinámica (Spainish) [Thermodynamics]. Mexico: Mc-GRAW-HILL; 2012.

8. Pankratov G. Problemas de termotecnia (Spainish) [Problems of thermotechnics]. Moscow: Mir; 1987.

9. Rubio A. Generadores de vapor. Funcionamiento y explotación (Spainish) [Steam generators. Operation and exploitation]. Santa Clara: Feijóo; 2015.

10. Pavlov KF, Romankov PG, Noskov AA. Problemas y ejemplos para el curso de operaciones básicas y aparatos en tecnología química (Spainish) [Problems and examples for the course of basic operations and apparatus in chemical technology]. Moscow: Mir; 1981.

11. Ohijeagbon IO, Waheed MA, Jekayinfa SO. Methodology for the physical and chemical exergetic analysis of steam boilers. Energy 2013; 53: 153–164. doi: 10.1016/j.energy.2013.02.039.

12. Oliva LO. Indicaciones metodológicas para el cálculo de los rendimientos de los generadores de vapor (Spainish) [Methodological indications for the calculation of steam generator performances]. Santiago de Cuba; 2012.

13. Nordelo AB, González ÁR. Combustión y generación de Vapor (Spainish) [Combustion and steam generation]. Havana: Félix Varela; 2010.

14. Dincer I, Rosen MA. Exergy. Energy, environment and sustainable development. London: Elsevier Ltd; 2013.

15. Kotas TJ. The exergy method of thermal plant analysis. Butterworths; 1985.

16. Oliveira Sd. Exergy. Production, cost and renewability. London: Springer-Verlag London; 2013.

17. Szargut J, Styrylska T. Angenäherte Bestimmung der Exergie von Brennstoffen (German) [Approximate determination of the exergy of fuels]. Brennstoff-Wärme-Kraft 1064; 589–596.

18. Querol E, Gonzalez-Regueral B, Perez-Benedito JL. Practical approach to exergy and thermoeconomic analyses of industrial processes. London: Springer; 2013.

19. Guoy M. Sur l’energie utilizable (French) [On usable energy]. Journal of Physics: Theories and Applications 1889; 8(1): 501–518.

20. Kreith F, Goswami YD. The CRC handbook of mechanical engineering. CRC Press LLC; 2005.

21. Borges RJ, Monzón JA, Rodríguez MJ, et al. Método para la evaluación de la eficiencia e impacto ambiental de un generador de vapor (Spainish) [Method for the evaluation of the efficiency and environmental impact of a steam generator]. Energy Engineering 2016; 27(2): 135–143.




DOI: https://doi.org/10.24294/tse.v4i2.1521

Refbacks

  • There are currently no refbacks.


Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

Creative Commons License

This site is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.