Effects of Temperature and Flue Gas Recycle on the SO2 and NOx Emissions in an Oxy-fuel Fluidized Bed Combustor

A review of oxy-fuel combustion in fluidized bed reactors

“…This study showed that SO 2 recirculation increased the Ca‐based sorbent activity; however, it did not affect N 2 O emission, while most of the recycled NO was reduced to N 2 and N 2 O. Lastly, steam recirculation resulted in a sharp decrease in NO emissions, a minor increase in N 2 O emissions, and the CO concentration in the flue gas was not affected. De las Obras‐Loscertales et al studied the effects of temperature and flue gas recycle on the SO 2 and NOx emissions also using the same facility and Spanish anthracite coal as fuel together with a high purity Spanish limestone as calcium‐based sorbent for sulfur retention. They found that the optimum operating temperature for sulfur retention shifted from about 860 °C in enriched air combustion to 900–925 °C in oxy‐combustion mode.…”

“…Researchers at ICB‐CSIC in Spain observed that NO and N 2 O emissions were almost similar under both combustion atmospheres (air and oxy). NO was found to increase slightly with temperature, while N 2 O decreased with rising temperature.…”

Effects of Gas Staging on the NO Emission during O2/CO2 Combustion with High Oxygen Concentration in Circulating Fluidized Bed

“…The higher temperatures and the higher location of chars that burned cause the increasing of NO emission. 48 Another interesting point is the significant NO formation near the injection when the secondary gas was injected into the combustor, as given in Figure 8. It is associated with the oxidation of combustible species, mainly gases, coming from the fuel-rich dense zone.…”

Introduction of Novel Method for Sweetening of Sour Petroleum

“…So, the resulting fuels meet environmental protection standards [4][5][6][7]. The challenge of fulfilling the world's growing transportation energy needs is no longer a simple issue of producing enough liquid hydrocarbon fuels [8].…”