Burner for burning powdered fuel

US5651320A · kind A · utility

Assignee

• Babcock Lentjes Kraftwerkstechnik GmbH · DE

Inventors

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

Key dates

• Filing date: Jan 6, 1995
• Grant date: Jul 29, 1997
• Expiry date: Jan 6, 2015

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23D1/02
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A burner for burning powdered fuel in air. The air is divided into concentric annular currents. A tube (6) conveys primary air or gas. The tube is surrounded by another tube (12). The second tube conveys secondary air. The exit of the primary-air tube inside the secondary-air tube is surrounded by an annular baffle (26). The baffle is open at each end, has secondary air flowing through it, and extends axially beyond the primary-air tube as much as 25% of the tube's outside diameter. The thickness of the gap (25) between the primary-air tube and the baffle is at least 1.5% of that diameter.