氨/空气在多孔介质表面燃烧的实验研究OA

In order to investigate the combustion and emission characteristics of ammonia/air at porous media burners composed of silicon carbide foam ceramics,the effects of ammonia flow,equivalence ratio and pore density of silicon carbide materials on flame structure,temperature distribution,flammability limit and NOx e-missions were studied.The results show that the change of equivalence ratio makes the surface combustion flame shape change significantly.When the equivalence ratio φ is 1.0,the flame burns in close contact with the surface of the silicon carbide porous medium.The pore density of porous media and the flow rate of ammonia gas affect the gas outlet velocity on the surface of porous media,which changes the flame combustion intensity and then affects the difference of flame temperature distribution.The lean and rich limit equivalence ratio of the surface flame is approximately 0.6 and 1.4,respectively.The flammability limit slightly broadens with the in-crease of silicon carbide pore density,and gradually decreases with the increase of ammonia flow rate.With the increase of equivalence ratio or silicon carbide pore density,NOx emission decreases significantly in lean con-ditions,and decreases slightly in rich conditions,achieving its minimum emission of about 10 ppm.