Resumo

VIGUERAS-ZUNIGA, Marco Osvaldo; VALERA-MEDINA, Agustín; SYRED, Nicholas  e  DE LA ROSA-URBALEJO, Daniel. Flashback Avoidance in Swirling Flow Burners. Ing. invest. y tecnol. [online]. 2014, vol.15, n.4, pp.603-614. ISSN 2594-0732.

Lean premixed combustion using swirling flows is widely used in gas turbines and combustion. Although flashback is not generally a problem with natural gas combustion, there are some reports of flashback damage with existing gas turbines, whilst hydrogen enriched fuel blends cause concerns in this area. Thus, this paper describes a practical approach to study and avoid flashback in a pilot scale 100 kW tangential swirl burner. The flashback phenomenon is studied experimentally via the derivation of flashback limits for a variety of different geometrical conditions. A high speed camera is used to visualize the process and distinguish new patterns of avoidance. The use of a central fuel injector is shown to give substantial benefits in terms of flashback resistance. Conclusions are drawn as to mitigation technologies

Palavras-chave : flashback; swirling flows; high speed photography.

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