Effect of Air-Fuel Equivalence Ratio on Combustion Process in Furnace of Razi Petrochemical Company’s Ammonia Unit
Article Type:
Research/Original Article (دارای رتبه معتبر)
Effect of fuel-to-air equivalence ratio on combustion process in the furnace of Razi petrochemical company’s ammonia unit is numerically analyzed in this paper. Three-dimensional geometry of the furnace has been modelled based on non-premixed fuel and air assumption. Modeling of steady-state compressible reactive-turbulent combustion is presented by the basic conservation equations considering the effects of conductive, convective and radiative heat transfers. Zeldovich and Fenimore mechanisms have been employed to account thermal and prompt NOx emission. Numerical results obtained with 99% accuracy compared to experimental data on a computational grid possessing 3165349 elements. Results showed that reduction of equivalence ratio causes the maximum flame temperature to approach inlet fuel nozzle and decrease flame length. High temperature at the furnace outlet is caused by better mixing of flows in great equivalence ratios. The production of NOx pollutants in the equivalence ratios of 0.833, 0.714 and 0.625 increases by 50.62, 53.23 and 56.2 percentages respectively with respect to the stoichiometric state.
Journal of Solid and Fluid Mechanics, Volume:11 Issue: 5, 2022
119 to 132
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