Zero Line Control for the Dryer Hood, 18PaperCon



To minimize drying energy costs this paper proposes optimizing dryer section hood and air system efficiency via the use of zero pressure line control combined with humidity control to maintain maximum exhaust humidity.

An overview of the dryer hood and its air system will be presented in order to understand hood balance principles and the determination of the required hood air quantities.

The quality of the vapor hood over the drying section influences the energy requirement for the drying process. Of prime importance is the sealing of the hood in order to attain the highest possible dew point temperature and exhaust pick-up humidity.

This approach yields the smallest exhaust air quantity, in turn lowering the energy demand on the air system of the dryer section as well as smaller process air system equipment.

A case study will be presented to examine the benefits of the proposed control strategy. 

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Author: Alfredo Sarli
Zero Line Control for the Dryer Hood, 18PaperCon
Zero Line Control for the Dryer Hood, 18PaperCon
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