Process for the regulating or controlling the NOx content of exhaust gases given off during the operating of glass melting furnaces with several burners run alternately

US6237368A · kind A · utility

Assignee

• Metallgesellschaft AG · DE

Inventors

• Hans Beisswenger · Bad Soden, DE
• Klaus Hasselwander · Oberursel, DE
• Hansjorg Herden · Rodgau, DE
• Gernot Mayer-Schwinning · Bad Homburg vor der Höhe, DE
• Gurudas Samant · Fronhausen, DE
• Peter Ludwig

Key dates

• Filing date: Aug 30, 1999
• Grant date: May 29, 2001
• Expiry date: Aug 30, 2019

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S422/90
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method for regulating or controlling the content of NO.sub.x in the exhaust gases of a glass-melting furnace having several burners operated in alternation, wherein both the beginning and the end of a combustion break (FP.sup.+, FP.sup.-) are supplied to a binary signal generator (8) which passes a signal to a regulator (4) with a time delay and upon receipt of the time-regulator (4), and the amount of NH.sub.3 supplied to the denitrating plant is adjusted to a lower constant fixed value F1 via a control, and by means of a memory element (7) a higher constant fixed value F2 is calculated as amount of NH.sub.3 and supplied to the regulator (4), whereupon as soon as the regulator (4) has received the signal of the time-delayed end of a combustion break, the fixed value F1 is adjusted to the fixed value F2 via a control, and subsequently the regulation is directly continued.