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Investigation of Thermodynamics Parameters on Flameless Combustion in Semi-Industrial Fixed Burners

Ghamari, Mahdi | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 58012 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Saeedi, Mohammad Hassan
  7. Abstract:
  8. Flameless or Moderate and Intense Low-oxygen Dilution (MILD) combustion represents a promising advancement in combustion technology, offering enhanced efficiency and significant reductions in pollutant emissions. This is achieved through the expansion of the reaction zone, uniform temperature distribution, elimination of hot spots, reduced oxygen concentration, and recirculation of flue gases. While extensive research has been conducted on flameless combustion and its influencing parameters, the majority of experimental and numerical studies have been limited to lab-scale conditions. Comprehensive investigations into the scale-up of flameless combustion systems remain scarce. In this study, four distinct scale-up methods were employed to examine the impact of oxidizer temperature on the occurrence of flameless combustion, flow regime, and pollutant emissions. The results indicate that the effect of temperature variation depends on the chosen scale-up method. For instance, higher oxidizer temperatures favor the H-R-K-Variable method, whereas in other methods, increased temperature shifts the combustion system towards alternative modes such as High Temperature Air Combustion (HiTAC). Additionally, higher temperatures lead to increased pollutant emissions due to elevated average combustor temperatures, activating NOx formation pathways and incomplete CO oxidation. Among the methods analyzed, the H-R-K-Variable approach demonstrated the closest correlation between pollutant emissions per power input, aligning with lab-scale results. Furthermore, the study highlights that flue gas recirculation significantly influences NOx formation, while CO production is primarily governed by temperature. This work provides valuable insights into the scale-up of flameless combustion systems, offering a pathway to bridge the gap between lab-scale research and industrial application
  9. Keywords:
  10. Flameless Combustion Scale ; Autoignition ; Path Reaction Analysis ; Carbon Monoxide Path Reaction ; Nitrogen Oxide Path Reaction ; Oxidizer Temperature ; Moderate or Intense Low Axygen Dilution (MILD) ; Methane

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