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THE SECOND LAW OPTIMAL OPERATION OF A VALMET NEWSPRINT PAPER DRYING MACHINE


ZVOLINSCHI ANITA
NORWEGIAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Issue:

MOCM, Number 11, Volume III

Section:

Efficient Utilization of Thermic and Electric Energy

Abstract:

The entropy production for the paper drying process was derived for a newsprint paper drying machine located at Norske Skog ASA in Skogn, Norway. The entropy production of the total process was calculated for actual operating conditions (i.e. reference conditions) and then optimised subject to a defined outlet paper moisture content (i.e. 0.07 kg H2O per kg dry paper). Inlet air humidity and cylinder group conditions were varied. Optimum conditions were obtained for a range of inlet air humidities, and for different cylinder groupings. We found that it was very favourable to increase the inlet air humidity. The realisation of such a change is probably hampered by unwanted condensation. Other changes had a negligible effect on the entropy production.

Keywords:

paper drying process, entropy production, optimum control theory.

Code [ID]:

MOCM200511V03S03A0012 [0000134]


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