RECOVERY BOILER AIR SYSTEMS Objectives of Air Systems
entering superheater tube banks AIR SUPPLY AND DELIVERY Slide 4 shows a side elevation of the lower furnace of a recovery boiler along with its dissolving tank. Slide 4 Air System Components (3Levels) Primary Secondary Liquor Guns Tertiary This boiler has a 3level air system. The primary air level is very near the bottom of the furnace.