Heat Transfer Analysis for Combustion under Low-Gradient Conditions in a Small-Scale Industrial Energy Systems

Mieszko Tokarski () and Rafał Buczyński
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Mieszko Tokarski: Department of Fuels Technology, Faculty of Energy and Fuels, AGH University of Kraków, al. Adama Mickiewicza 30, 30-059 Cracow, Poland
Rafał Buczyński: Department of Fuels Technology, Faculty of Energy and Fuels, AGH University of Kraków, al. Adama Mickiewicza 30, 30-059 Cracow, Poland

Energies, 2023, vol. 17, issue 1, 1-18

Abstract: The issue of maintaining low-gradient combustion in the conditions of high heat extraction has been investigated numerically in this work. The analyses include the application of a convective boundary condition at the wall (with estimated boiling heat transfer coefficient); analysis of the Internal Recirculation Device’s impact on combustion products and heat transfer under low-gradient conditions; and comparison of both traditional and low-gradient combustion modes. It was shown that the Internal Recirculation Device material and geometry has a significant impact on the nitrogen oxide (NO x ) formation mechanism, as NO 2 emission becomes predominant and can rise up to several hundreds ppm. What is more, along with decrease in thermal resistance of the IRD, CO emissions also increase rapidly, even achieving over 2000 ppm. Additionally, the convective heat transfer rate decreased by about 25% after switching from traditional to low-gradient combustion, whereas the radiative mechanism increased by ≈40% compared to traditional mode. It should also be mentioned that the low-gradient combustion applied in this work achieved approximately 10% higher efficiency than conventional combustion.

Keywords: CFD; combustion; low-gradient combustion; heat transfer; fire-tube boiler (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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