Metallurgical Gas Burner

Abstract

A steam generator gas burner for burning gases of low calorific value comprises a core air tube, a gas tube arranged coaxially around the core air tube to form a gas flow cross section, at least one further tube element arranged coaxially around the gas tube to form a secondary air flow cross section and first swirlers being arranged in the gas flow cross section. The first swirlers are adjustably arranged to allow for the steam generator gas burner to adjust to varying properties of the combustible gas, in particular a fluctuating calorific value, while taking into consideration the respective ignition intensity.

Description

PRIORITY CLAIM[0001]This application claims the priority to DE Patent Application Serial No. 10 2007 025 051.9-13, entitled “Metallurgical gas burner,” filed May 29, 2007. The specification of the above-identified application is incorporated herewith by reference.FIELD OF INVENTION[0002]The present invention relates to a steam generator gas burner for burning gases of low calorific value, which comprises a core air tube, a gas tube arranged coaxially around the core air tube to form a gas flow cross section, in particular an annular gas flow cross section, and at least one further tube element arranged coaxially around the gas tube to form a secondary air flow cross section, in particular an annular secondary air flow cross section, wherein first swirlers being arranged in the gas flow cross section.BACKGROUND INFORMATION[0003]When forming gas firing systems for steam generators, gas burners which burn gases of low calorific value are also used. Such gases of low calorific value are...

AI Technical Summary

Benefits of technology

"The present invention relates to a steam generator gas burner that can adapt to varying properties of the combustible gas, such as calorific value, while maintaining optimal burning and flame formation. The burner includes first swirlers that can be adjusted to influence the swirl of the gas flow, even during operation. The first swirlers are positioned in the gas flow cross section and can be rotated to change the cross-sectional area that opposes the gas flow direction, thereby adjusting the degree of swirl and flow obstacle. The arrangement of the first swirlers helps to achieve optimal ignition and flame formation, avoiding furnace chamber vibrations. The invention also includes a flow directing ring that deflects air and gas flows in opposite directions, delaying their meeting and optimizing ignition. The flow directing ring can be adjusted axially and has holes covered by a perforated plate. The invention provides a steam generator gas burner that can adapt to different combustible gas properties and optimize ignition and flame formation."

Problems solved by technology

In the case of gas firing systems, pressure vibrations may occur in the region of the combustion chamber and lead to damage to the lining of the steel structure.

If the combustion produces sufficiently strong pulses with a frequency close to the natural frequency of the combustion chamber, a resonance vibration is created, causing the additional loading.

The varying properties of the fuel have an influence on the formation of the flame and can then in turn lead to combustion chamber vibrations being caused by the combustion.

Images