Urea utilization efficiency of hybrid SNCR-SCR reaction was measured with a variation of reaction temperature, NSR and additives using a pilot scale flow reactor. DeNOX efficiency of urea solution was 10~80% at 850~1,000? with NSR = 1.0~2.5 and NH3 concentration after the SNCR reaction was about 100~1ppm. DeNOX efficiency of hybrid SNCR-SCR reaction was about 50~92% and the utilization efficiency of urea was 46%. It should be noted that selectivity of slipped NH3 over V2O5/TiO2 catalyst was almost 1.0 and the utilization efficiency of urea in a hybrid SNCR-SCR reaction depends on the DeNOX efficiency of SNCR reaction. In our study, maximum utilization efficiency was found to be 98% at 940?, NSR=1.1, and SV of catalyst=30,000hr-1. At that time DeNOX efficiency was 54%.

Characteristics of urea utilization in a hybrid SNCR-SCR reaction using pilot scale flow reactor

244th National Meeting (2012)

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