In this talk, a numerical study of characteristics of syngas diffusion flames in multi-slot burner is presented. The salient features of the numerical model include temperature and species concentration dependent thermo-physical properties, multi-component species diffusion including Soret diffusion, multi-step chemical kinetics mechanism and optically thin approximation based radiation sub-model. A multi-slot burner with five fuel slots and seven air slots, arranged in alternate manner with fuel slots in between air slots, has been chosen. Total power of the burner is kept as 10 kW and total air flow is taken as 400% of stoichiometric air. The percent of primary air (in fuel stream) or primary fuel (in air stream) is varied to observe its effects on flame characteristics. Maximum flame temperature remains almost constant with primary air and primary fuel variation because total mixture composition is kept the same. Vertical extent of temperature field is highest for the central flame and it decreases for middle and side flames in all cases. Time averaged lateral temperature profile shows that the location of peak value varies with mixture composition. Flame structure has been presented for these cases. Further, the characteristics of these flames impinging over isothermal solid walls are also studied. Here, location, height and length of impinging surface, and surface temperature have been varied. As the impinging surface location moves closer to the exits of the slots, a recirculation zone forms near the bottom surface. Recirculation zones are found to be affected by primary air and primary fuel percentages. Velocity vector fields are plotted to identify the recirculation zone in the flame zone. Distribution of averaged heat flux on all the surfaces have also been analyzed. Lateral distribution of heat flux shows that there is an optimum height at which uniform heat flux is obtained.