Method and apparatus for the reduction of NO.sub.x generation during coal dust combustion

US5979342A · kind A · utility

Assignee

• Babcock Lentjes Kraftwerkstechnik GmbH · DE

Inventors

• Alfons Leisse · Essen, DE
• Michael Streffing · Beckum, DE

Key dates

• Filing date: Aug 14, 1998
• Grant date: Nov 9, 1999
• Expiry date: Aug 14, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23D2201/20
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A burner for the combustion of coal dust in which a stream of primary air and coal dust mixture is conducted through a dust conduit connected to a primary dust tube. A secondary air tube surrounds the primary dust tube, and a tertiary air tube surrounds the secondary air tube. The secondary and tertiary air tubes are connected to a helically-shaped input housing, and a conically flared section extends from each of the secondary and tertiary air tubes. An angular momentum is applied in the dust conduit divides the primary air and coal dust mixture into high-dust and low-dust partial streams, so that the high-dust partial stream flows through the primary dust tube, and the low-dust partial stream flows through the primary gas tube.