Measurement of CH density in a pulsed-dc hydrocarbon-gas-mixture dischargeNitrogen oxide γ -band emission from primary and secondary streamers in pulsed positive corona discharge J. Appl. Phys. 97, 013302 (2005); 10.1063/1.1829371Numerical analysis of repetitive pulsed-discharge de-NO x process with ammonia injection Emission regulations are gradually being tightened recently to prevent further air pollution. Cost-effective and efficient technologies must be developed to process the NO x generated in the combustion of fossil fuels. One of the candidate technologies to process NO x is the denitrification of flue gas by pulsed corona discharge, which has been demonstrated experimentally to show high de-NO x performance. However, the optimization of operation conditions and the appropriate understanding of the de-NO x process still remain to be clarified. Therefore, following our previous study on ammonia injection, we have simulated in the present study the de-NO x process to which hydrocarbons such as ethylene have been added to provide guidelines on its proper operation conditions and its main reaction paths to remove NO x . The simulated results show that the removal efficiency in a case of ethylene addition becomes lower than for ammonia addition, but the de-NO x energy consumption rate becomes lower than for ammonia injection. However, with ethylene injection the production of the pollutant, formaldehyde, limits the allowable amount of injected ethylene. The de-NO x performance is better with propylene than ethylene injection because propylene reacts with the OH radical more than ethylene to oxide NO x . However, formaldehyde is also produced in the case of propylene injection, limiting the allowable amount of injected propylene. The de-NO x performance is also assessed in a case where HNO 2 is considered as N x O y .