Abstract
We have been developed a unique De-NO_x system by direct ammonia radical injection using an intermittent dielectric barrier discharge (DBD) with a one-cycle sinusoidal-wave power source. Energy efficiency of De-NO_x in this system is 120g-NO/kWh, which is the higher efficiency than other De-NO_x systems using different plasma techniques. However, more improvements of energy efficiency are needed for practical use. In this study, effects of gas mixing between ammonia radicals and model gas (NO/N_2) in a reaction chamber on the energy efficiency are investigated. It is found that an increasing of the gas mixing contribute to a substantial increase of the energy efficiency. Three dimension computational fluid dynamics (3D-CFD) simulation coupled with De-NO_x mechanisms was carried out to analyze effects of gas mixing. Gas mixing conditions for complete De-NO_x reaction were estimated by 3D-CFD simulation with elemental reactions in H-N-O system.
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