Method of reducing the nox-emissions during combustion of nitrogen-containing fuels

US4790743A · kind A · utility

Assignee

• L & C Steinmuller GmbH · DE

Inventors

• Klaus Leikert · Gummersbach, DE
• Klaus-Dieter Rennert · Gummersbach, DE
• Gerhard Buttner

Key dates

• Filing date: Dec 3, 1986
• Grant date: Dec 13, 1988
• Expiry date: Dec 3, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23C2201/30
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method of reducing the NO.sub.x --emissions during combustion of nitrogen-containing fuels via burner units each including a primary burner and being arranged in a wall of a closed combustion chamber; fuel and air for combustion are supplied to the burner flame in stages as partial flows via delivery means which are separate from one another. With a number of primary burners being arranged one above the other the method is carried out in three steps: feeding coal dust along with its carrier gas to the primary burner and generating a primary flame zone having a strong internal back flow region and burning the coal dust under fuel-rich conditions, feeding reduction fuel into the combustion chamber and generating a secondary flame zone in the vicinity of the primary flame zone and being operated under more-fuel-rich conditions than the primary flame zone, feeding reduction fuel into the combustion chamber and generating a secondary flame zone in the vicinity of the primary flame zone and being operated under more-fuel-rich conditions than the primary flame zone, and feeding state air into the combustion chamber of the secondary flame zone and being operated under fuel lean condition…