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Towards ideal NOx control technology using a plasma-chemical hybrid process

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4 Author(s)
T. Yamamoto ; Dept. of Energy Syst. Eng., Osaka Prefecture Univ., Japan ; M. Okubo ; K. Hayakawa ; K. Kitaura

The plasma-chemical hybrid process developed was extremely effective and economical in comparison with the conventional selective catalytic reduction (SCR) system and other technologies for NOx removal from flue gas emissions. A series of experiments was performed to quantify all the reaction by-products such as N2O, CO, HNO2, HNO3, and NO3 - and to evaluate NOx removal efficiency. The optimum plasma reactor and its operating characteristics were investigated with regard to reaction by-products and NOx removal efficiency using the ordinary ferroelectric packed-bed plasma reactor and the barrier-type packed-bed plasma reactor. The oxidation from NO to NO2 without decreasing NOx concentration (i.e., minimum reaction by-products) and with least power consumption is the key for the optimum reactor operating condition. The produced NO2 was totally converted to N2 and Na 2SO4 with Na2SO3 scrubbing. The barrier-type packed-bed plasma reactor having 1.5 mm diameter electrode and 3 mm diameter BaTiO3 pellets showed the superior NO oxidation without producing the by-products over the conventional packed-bed reactor. The barrier-type packed-bed plasma reactor followed by the chemical reactor showed extremely low operating costs (less than 1/6 of the SCR process) and achieved nearly 100% NOx removal with less than 6 ppm of N2O and 5 ppm of CO

Published in:

IEEE Transactions on Industry Applications  (Volume:37 ,  Issue: 5 )