Numerical Investigation of the Effect of Geometric Parameters of Nozzles on the Performance of Flameless Combustion of natural gas and NOx

Document Type : Mechanics article

Authors

1 Faculty of Mechanical Engineering,University of Kashan,Kashan,Iran

2 Associate professor, Faculty of Mechanical engineering, University of Kashan

Abstract

Flameless combustion is a leading way to increase combustion efficiency and reduce pollutant production. The investigation of the properties of flameless combustion in industrial furnaces needs further study.The purpose of this study is to numerically investigate the effect of geometric parameters including distance between the fuel and air injection nozzles and number of fuel nozzles on flameless combustion performance in a semi-industrial furnace.Standard k-ɛ and the eddy dissipation concept models are used to model turbulence and combustion, respectively, and the WSGGM model is used to calculate the absorption and emission coefficients. Comparison of preliminary simulation results with experimental data on temperature and velocity distribution at different cross sections shows good compatibility. The accuracy of the radiative model has been evaluated by examining the states without applying the radiative model,P1 model and DO model and based on results P1 model has been selected.The results show that changing the distance of the fuel and oxidizer nozzles is more effective in the upstream area of the combustion chamber.By removing the fuel nozzle from the center of the chamber, the effect of the return combustion products on the reaction zone intensifies and the peak temperature of the chamber decreases. Also,with the increase in the number of fuel injectors,more temperature gradient is created in the chamber and combustion from the flameless state leads to the unstable flame.Increasing the distance between the nozzles with fewer fuel nozzles improves the accessing to flameless combustion state in industrial furnaces and reduces the amount of nitrogen oxide emissions produced.

Keywords

References

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Journal of Modeling in Engineering
Volume 18, Issue 60
June 2020
Pages 245-256

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History

  • Receive Date: 16 November 2019
  • Revise Date: 07 January 2020
  • Accept Date: 12 January 2020

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