Less Emissions and improved efficiency in Coat Drying - Project Implemented in Sappi Gratkorn OMC 9, 2021 TAPPICon Live (21TAPL)

The article is describing optimization of the total non-contact drying process of coated paper. The different technologies for non-contact drying are infra-red radiation with electricity or gas as energy source and convectional heat transfer via hot air where the energy source is normally gas or steam.

The primary energy input for the drying energy is via new developed infrared emitters. The focus is set on maximizing the portion of infrared radiation as well as having the optimal combustion process. Thereby the emission of organic carbon, NOX and CO is minimized.

Next step in the drying optimization is the multiple utilization of the hot flue gases for convective heat transfer in several steps. The idea is to have a limited and controlled amount of exhaust air flow from the IR emitters in order to achieve an air temperature high enough for most efficient convective heat transfer. 

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