Papermachine Hood and Air Systems, 19PaperCon
Drying is the most energy‐intensive process in the papermaking process accounting for 80% of all energy costs due principally to cylinder drying and supply air heating. Drying energy consumption depends on many factors such as press design concept, steam and condensate system optimization, hood air balance and exhaust humidity control. This paper will focus on the latter two factors, namely the optimization of the papermachine hood and air systems.
Just looking at the tons of steam consumed per ton of paper produced (tsteam/tproduction) doesn’t correctly rate the efficiency of the drying process. A more complete and realistic evaluation is the steam consumption per ton of water evaporated: tsteam/tevaporated H2O. For example, air balance of the papermachine hood has a significant impact on steam consumption at the drying cylinders if we consider that all air flow through the dryer section is heated up to exhaust air temperature, including the cold, ambient leakage air that infiltrates into the hood; this air is also being heated by the dryer cylinders, in turn consuming steam.
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Papermachine Hood and Air Systems, 19PaperCon
