Abstract
Application of pulsed electrical discharge for gas cleaning is gaining prominence. Particularly, various experiments using plasma techniques have been studied to reduce NOx generated from fossil fuel combustion. Different kinds of plasma reactors have been developed to remove NOx for high efficiency and low cost. However, energy efficiency (g-NO/kWh) is low in their techniques because large amount of exhaust gas are treated in plasma reactors with large power consumption. For improving energy efficiency, we have developed a new De-NOx system by ammonia radical injection. NO reduction experiment was performed by injecting ammonia radicals, which were externally generated by flowing the NH3 gas diluted with Ar gas through a dielectric barrier discharge (DBD) with a one-cycle sinusoidal-wave power source. An intermittent one-cycle-sinusoidal power source was employed as the power source for generating DBD. The discharge was intermittently formed between coaxial cylindrical electrodes with a space of 1.5 mm at an applied peak-to-peak voltage of 3-15kV. The generated radicals were injected to simulation gas (NO/O2/N2). The simulation gas contained 0-5 % O2, and the effect of O2 on NOx removal was investigated. As a result, the maximum energy efficiency in this system was 140 g/kWh.
