Chinese Journal of Chemical Engineering, Vol.27, No.2, 426-443, 2019
Advances in reduction of NOx and N(2)O1 emission formation in an oxy-fired fluidized bed boiler
Fossil fuel combustion is one of the major means to meet the mounting global energy demand. However, the increasing NOx and N2O emissions arising from fossil fuel combustion process have hazardous effects. Thus, mitigating these gases is vital to attain a sustainable environment. Interestingly, oxy-fuel combustion in fluidized bed for carbon capture and minimized NOx emissions is strongly sustainable compare to the other approaches. It was assessed that NOx formation and fuel-N conversion have significant limitation under oxy-fluidized bed compared to air mode and the mechanism of NOx formation is still deficient and requires further development. In addition, this review paper discussed the potential of primary measure as low emission process with others supplementary techniques for feasible NOx reduction. The influences of combustion mode, operating parameters, and reduction techniques such as flue gas recirculation, oxygen staging, biomass co-firing, catalyst, influence of fluidized bed design and structure, decoupling combustion and their merges are respectively evaluated. Findings show that significant minimization of NOx emission can be achieved through combination of primary and secondary reduction techniques. (C) 2018 The Chemical Industry and Engineering Society of China, and Chemical Industry Press. All rights reserved.
Keywords:Oxy-fuel combustion;Fluidized bed technology;Biomass blend;Primary/secondary measures;NOx emission