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An experimental investigation of the stability limits of biogas in a swirling   non-premixed burner has been carried out. A mixture of 60% methane (CH4) and   40% carbon dioxide (CO2) was used to reach the typical biogas composition.   Vane swirlers with 30º, 45º and 60º angles were used to make the swirling   air. The biogas stability limits and flame behavior under swirling conditions   were tested. Besides, effects of air dilution with nitrogen (N2) and CO2 on   biogas stability limits were investigated. The results show that using swirl   can enhance the flame stability limits approximately four or five times   comparing to non-swirling air stream. Adding N2/CO2 to the air had negative   effects on the flame stability but no changes were observed in the flame   structure. The maximum air dilution was also obtained when 27% and 15% N2 was   added to the swirling air under strong and weak swirl, respectively

Experimental study of the effects of swirl and air dilution on biogas non-premixed flame stability