TY - JOUR
T1 - Experimental study on the influence of the nitrogen concentration in the oxidizer on NOx and CO emissions during the oxy-fuel combustion of natural gas
AU - Gaber, Christian
AU - Schluckner, Christoph
AU - Wachter, Philipp
AU - Demuth, Martin
AU - Hochenauer, Christoph
PY - 2021/1/1
Y1 - 2021/1/1
N2 - In this research, the influence of the nitrogen concentration in the oxidizer, oxygen/fuel equivalence ratio and temperature of the combustion chamber on the combustion characteristics of a natural gas fired oxy-fuel jet burner was observed. The thermal input of the fuel was 600 kW and the nitrogen concentration in the oxidizer was varied between 0 and 15 vol.-%, wherein either the maximum combustion chamber temperature or the thermal output were held constant. It was observed that in case of a constant combustion temperature, even small volume fractions of nitrogen in the oxidizer resulted in non-negligible reductions in the thermal output. Furthermore, the experimental results showed that an increase in the nitrogen concentration from 0 to 15 vol.-% caused an approximately eight-fold increase in the NOx emissions and a considerable decrease in the CO emissions. The impact of the oxygen/fuel equivalence ratio on the NOx emissions was negligibly small up to a nitrogen concentration of 2 vol.-%. A reduction of the oxygen/fuel equivalence ratio to near stoichiometric levels resulted in NOx emission factors below 52 mg/kWh. The influence of the oxygen/fuel equivalence ratio on the NOx emissions was significantly more pronounced with an increasing amount of nitrogen present in the oxidizer.
AB - In this research, the influence of the nitrogen concentration in the oxidizer, oxygen/fuel equivalence ratio and temperature of the combustion chamber on the combustion characteristics of a natural gas fired oxy-fuel jet burner was observed. The thermal input of the fuel was 600 kW and the nitrogen concentration in the oxidizer was varied between 0 and 15 vol.-%, wherein either the maximum combustion chamber temperature or the thermal output were held constant. It was observed that in case of a constant combustion temperature, even small volume fractions of nitrogen in the oxidizer resulted in non-negligible reductions in the thermal output. Furthermore, the experimental results showed that an increase in the nitrogen concentration from 0 to 15 vol.-% caused an approximately eight-fold increase in the NOx emissions and a considerable decrease in the CO emissions. The impact of the oxygen/fuel equivalence ratio on the NOx emissions was negligibly small up to a nitrogen concentration of 2 vol.-%. A reduction of the oxygen/fuel equivalence ratio to near stoichiometric levels resulted in NOx emission factors below 52 mg/kWh. The influence of the oxygen/fuel equivalence ratio on the NOx emissions was significantly more pronounced with an increasing amount of nitrogen present in the oxidizer.
KW - Natural gas, NO and CO emissions
KW - Oxy-fuel combustion
KW - Oxy-fuel jet burner
KW - Semi-industrial combustion chamber
UR - http://www.scopus.com/inward/record.url?scp=85092260510&partnerID=8YFLogxK
U2 - 10.1016/j.energy.2020.118905
DO - 10.1016/j.energy.2020.118905
M3 - Article
AN - SCOPUS:85092260510
SN - 0360-5442
VL - 214
JO - Energy
JF - Energy
M1 - 118905
ER -