RE:RE:RE:RE:RE:Induration furnaceThe picture on the right shows conveyors feeding dried concentrate to balling drums. The rolling action of the drum rotation causes agomeration of the feed into green balls, green pellets which are then fed to a travelling gate for further drying before they are cooked to create hard pellets which can be handled without breaking or creating too much dust.
On the left it looks like a travelling grate, doing what I cannot say, drying cooking ?
The round drum like things along the sides of the furnace could be air flow ducts and/or access ports for maintenance. I doubt if they are burners, too many. The large duct above the drums could be hot air going into or coming out of the furnace. This air may get heated before going back into the furnace by ?# of burner(s). Note that no air movement fans are shown.
Below the drums you can see a large number of round things which may be bearings associated with the travelling grate. These may be what you have identified as burners. Burners are associated with radiant heat which could simply be too hot for drying pellets and would over heat the pellets on the surface of the bed possibly leading to exploding pellets when water vapourizes into steam too rapidly. Remember that the objective is to heat the bed uniformly through it's thickness. That is part of the reason for up and down draft sections. I see no burners at all in the photos. Lots of burners would mean lots of maintenance. Reduce the # of burners to the minimum.
Heat the air at the exit of the fans before sending it to it's destination. Insulate the ducts.
Niether photos looks like what I have seen as they are too clean, not enough black dust laying around LOL.