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NOX reburning in oxy-fuel combustion - An experimental investigation

Daniel Kühnemuth (Institutionen för energi och miljö, Energiteknik) ; Fredrik Normann (Institutionen för energi och miljö, Energiteknik) ; Klas Andersson (Institutionen för energi och miljö, Energiteknik) ; Filip Johnsson (Institutionen för energi och miljö, Energiteknik) ; Bo Leckner (Institutionen för energi och miljö, Energiteknik)
27th Annual International Pittsburgh Coal Conference 2010, PCC 2010; Istanbul; Turkey; 11 October 2010 Vol. 1 (2010), p. 256-270.
[Konferensbidrag, övrigt]

This work investigates the reburning reduction of nitric oxide (NO) in a 100 kW propane-fired oxyfuel flame. The conducted experiments include a comprehensive parameter study: NO was injected into the recycled flue-gas, the inlet oxygen concentration was varied between 25 and 37 vol. % and the stoichiometric ratios at the burner inlet ranged from 0.7 and 1.15. The respective influence of inlet oxygen concentration and burner stoichiometry on once-through and total reduction of NO was measured. Furthermore, concentration and temperature in the furnace were mapped to identify important differences between oxy and air-fired conditions. The furnace measurements show that the peak concentration of carbon monoxide may be more than twice as high as in air-fired conditions. The formation paths of CO and its influence on the NO x chemistry are therefore discussed. The results of the parameter study show that reburning is favored by decreased burner stoichiometry. The effect of inlet oxygen concentration on once-through NO reduction is of minor importance. Changes in stoichiometry and oxygen inlet concentration are associated with changes in recycle ratio. The influence of the recycle ratio on the NO reduction is of great importance and is investigated as separate parameter.

Nyckelord: Oxy-fuel, reburning, NOx, CO2/O2



Denna post skapades 2010-12-01. Senast ändrad 2016-08-15.
CPL Pubid: 129892

 

Institutioner (Chalmers)

Institutionen för energi och miljö, Energiteknik

Ämnesområden

Termisk energiteknik

Chalmers infrastruktur

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