Chemical Engineering

66th Conference on Glass Problems by Waltraud M. Kriven

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By Waltraud M. Kriven

This publication offers a state of the art selection of papers awarded on the 66th convention on Glass difficulties on the college of Illinois at Urbana-Champaign in October of 2005. 

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8. r @ - " - r r - " - 3 1 c - * =*= Operator's Control ----- Figure 6: Operators prefer to run melter hot versus cold while ES 40 . 66th Conference on Glass Problems -* -. --* ES illTM Contol uses gas efficiently Advanced Control System to Increase Glass Quality and Glass Production Yields Now there is time for discussion about first operator's dilemma. A continuous monitoring of all process inputs and outputs together with MPC control results into temperatures stabilization. Even in a case of unknown disturbance the MPC control can protect temperatures (and other outputs, of course) against excessive oscillation around requested zones.

Cooling down of these melts may lead to dross formation in the cold end. An online oxygen sensor can he very useful to monitor and control the oxygen level in order to stay in the area under the dashed line. In this respect. * value below unity at every measuring location along the entire bath length, no dross will be formed in the cold end area. * value above unity a higher hydrogen level or an increased venting of the float bath atmosphere may be considered. * values are lower than required for dross free operation.

Forehearth temperatures are fed forward, so bushings can adapt to incoming temperatures more effectively than PID loops. o Float plants see increased temperature stability and better glass level control in the melter as well as improved temperature control in the lehr. 52 .

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