A Kinetic Study of NO Removal from Combustion Gases by Injection of NH_i-Containing Compounds

Abstract

Detailed kinetic calculations have been carried out to evaluate candidate schemes for the removal of NO from combustion gases by injection of compounds leading to homogeneous NH_i-NO reactions (i = 2, 1, 0). NO removal is calculated as a function of temperature and reaction time for prescribed initial levels of NO in otherwise equilibrated fuel lean combustion gases. Four different compositions are considered, chosen to include mixtures representative of the Thermal DeNO_x Process (injection of NH₃ or NH₃/H₂), as well as alternative mixtures (NH₃/H₂O₂ and NH₂/CO, the latter chosen to simulate urea) which may have advantages for particular applications, for example in shifting the temperature for optimum NO conversion or in reducing the required reaction time.