Method and device for operating a combined burner for liquid and gaseous fuels

US5664943A · kind A · utility

Assignee

• ABB RESEARCH LTD. · CH

Inventors

• Franz Joos · Waldshut-Tiengen, DE
• Tino-Martin Marling · Berau, DE
• Peter Senior · Kraainem, BE

Key dates

• Filing date: May 25, 1995
• Grant date: Sep 9, 1997
• Expiry date: May 25, 2015

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F23C2900/07002
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A method and device for operating a combined burner for liquid and gaseous fuels for the purpose of generating hot gases functions to raise the lean stability limit of the gas flame without impairing the atomization of the liquid fuel and improve the regulating range of the burner. According to the invention, this is achieved when the inflow rate and/or swirl of the blast air (5) into the inner burner space (16) is controlled. To this end, the blast air (5), during operation with gaseous fuel (6), is throttled back by injection of pilot fuel into the blast air, and additionally swirled by swirl generators in the burner. In addition, active regulation of the blast air inflow rate is effected at the burner inlet during the use of both gaseous fuel and liquid fuel.