The behaviour of lifted oxy-fuel flames in burners with separated jets |
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Authors: | T Boushaki JC Sautet L Salentey B Labegorre |
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Affiliation: | 1. CORIA UMR 6614 CNRS — Université et INSA de ROUEN, Avenue de l''Université, BP 12, 76801 Saint Etienne du Rouvray, Cedex, France;2. Air Liquide CRCD, Les Loges en Josas, BP 126, 78350 Jouy en Josas, France |
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Abstract: | Oxy-fuel combustion in separated-jet burners has been proven to increase thermal efficiency and to have a potential for NOx emission reduction. This paper presents an investigation into confined, turbulent, oxy-flames generated by a burner consisting of a central natural gas jet surrounded by two oxygen jets. The study is focused on the identifying the influence of burner parameters on the flame characteristics and topology, namely stability, lift-off height and flame length. The effects of the natural gas and oxygen jet exit velocities, the distance separating the jets and the deflection of oxygen jets towards the natural gas jet are examined. The OH chemiluminescence. Results show that the lift-off heights increase when jet exit velocities and the distance separating the jets are increased. The deflection of oxygen jets decreases the lift-off height and increases the volume of flame in the transversal plane. The flame length increases principally with the oxygen exit velocity and the separation distance, and decreases considerably when the angle of oxygen jets is increased. |
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Keywords: | Separated-jet burner Oxy-flame Lifted flames Flame stability OH chemiluminescence |
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