Numerical Simulation On Two-dimensional Slit Flame Of Oxygen Diluted Partially Premixed/Oxygen Enriched Supplemental Combustion

The burning of fossil fuels is the main source of energy and power in the humansociety. At the same time, we could not ignore the negative effects. Therefore, seeking akind of cleaning and efficient combustion technology is particularly important.This paper conducts the numerical simulations on diffusion flames, lean premixedflames, partially premixed methane/air counter-flow flames and oxygen diluted partiallypremixed/oxygen enriched supplemental combustion flames by simplifying the physicalgeometry and basing on the platform of FLUENT software and analyses the effects oftwo-dimensional oxygen concentration distribution on flame structure, reactionmechanism and pollutant emissions. Some studies have found that numerical simulation isconsistent with the experiment which implies that the numerical simulation method isfeasible. Oxygen diluted partially premixed/oxygen enriched supplemental combustion cannot only effectively increase the combustion efficiency but also improve the characteristicsof pollutant emissions by controlling oxygen concentration distribution.A comparative analysis is done on the following conditions which include equivalenceratio of the overallt=0.65、0.8、0.9, equivalence ratio of partially premixedp=1.2、1.3、1.4and the oxygen diluted concentration=0.17、0.18、0.19、0.20. The optimum conditionsareP=1.3-1.4for the equivalence ratio of the partially premixed flow and=18%-19%forthe oxygen diluted concentration. The emission of Nitrogen oxides is reduced by22%andthe emission of CO can reduce an order of magnitude by comparison to partially premixedmethane/air counter-flow flames when the equivalence ratio of the premixed flow is thesame.