Method and apparatus for the heat treatment of fine-grained material

US4808108A · kind A · utility

Assignee

• Krupp Polysius AG · DE

Inventors

• Peter Tiggesbaumker · Oelde, DE
• Manfred Durr · Bad Sobernheim, DE
• Jurgen Wurr · Ennigerloh, DE
• Karl Krutzner · Beckum, DE
• Wolfgang Rother
• Karl Menzel · Ennigerloh, DE
• Frank Schaberg · Oelde, DE
• Heinrich Klockenbusch
• Georg Unland · Ennigerloh, DE
• Gunter Driemeier · Lienen, DE

Key dates

• Filing date: Sep 28, 1987
• Grant date: Feb 28, 1989
• Expiry date: Sep 28, 2007

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F27B7/42
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

The heat treatment of fine-grained material wherein two quantities of fuel are delivered to a precalcination zone at two different levels. The first quantity of fuel is delivered at a lower level nearer the combustion zone and the oxygen content of the gases passing through this region of the precalcination zone are such that in this region a substoichiometric combustion takes place and a CO content between 0.05% and 1% is established. As a result a reducing decomposition of the NO.sub.x content of the exhaust gases from the combustion zone takes place.