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The objective of this research was to test whether, under controlled laboratory conditions, hybrid SNCR/SCR process improves NO_x removal efficiency in comparison with the SNCR only. The hybrid process is a combination of a redesigned existing SNCR with a new downstream SCR. NO_x reduction experiments using a hybrid SNCR/SCR process have been conducted in simple N0/NH<sub>3</sub>/ O₂ gas mixtures. Total gas flow rate was kept constant 4 liter/min throughout the SNCR and SCR reactors, where initial NO_x concentration was 500 ppm in the presence of 5％ or 15％ O₂. Commercial catalysts, V₂O_(5)-WO<sub>3</sub>-SO<sub>4</sub>/TiO<sub>2</sub>, were used for SCR NO_x reduction. The residence time and space velocity were around 1.67 seconds and 2,400 h^(-1) or 6000 h^(-1) in SNCR and SCR reactors, respectively. NO_x reduction of the hybrid system was always higher than could be achieved by SNCR alone at a given value of NH_(3SLIP). Optimization of the hybrid system performance requires maximizing NO_x removal in the SNCR process. An analysis based on the hybrid system performance in this lab-scale work indicates that a equipment with NO_(X<sub>1</sub>)=500 ppm will achieve a total NO_(x) removal of about 90 percent with NH_(3SLIP)≤ 5 ppm only if the SNCR NO_x reduction is at least 60 percent. A hybrid SNCR/SCR process has shown about 26~37％ more NO_x reduction than a SNCR unit process in which a lower temperature of 850℃ turned out to be more effective.
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UCI(KEPA) : I410-ECN-0102-2023-451-001817400