Method of purifying the exhaust gases from plants for the production of cement clinker

US5169611A · kind A · utility

Assignee

• Krupp Polysius AG · DE

Inventors

• Detlev Kupper · Telgte, DE
• Ludger Brentrop · Oelde, DE
• Wolfgang Rother
• Rainer Schutte · Ennigerloh, DE

Key dates

• Filing date: Dec 31, 1990
• Grant date: Dec 8, 1992
• Expiry date: Dec 31, 2010

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E50/30
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention relates to a method and apparatus for purifying the exhaust gases from plants for the production of cement clinker, in which in a multi-stage filter zone hot exhaust gases coming from a preheating zone are first of all cleaned of dust in a first filter stage and then in a further stage are purified of NH.sub.x compounds, heavy metals and trace pollutants, SO.sub.z and NO.sub.x. In order to achieve a particularly efficient and economic purification, the exhaust gases from the preheating zone are set before the first filter stage to such a filter zone inlet temperature that in this first filter stage at least a proportion of the easily volatile pollutant elements and pollutant compounds are precipitated out of the exhaust gases in addition to the dust.