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KMID : 1024520030120090997
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Journal of the Environmental Sciences
2003 Volume.12 No. 9 p.997 ~ p.1002
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Application of Hybrid SNCR/SCR process for Improved NOχ Removals Efficiency of SNCR
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Choi Sang-Ki
Choi Sung-Woo
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Abstract
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The objective of this research was to test whether, under controlled laboratory conditions, hybrid SNCR/SCR process improves N removal efficiency in comparison with the SNCR only. The hybrid process is a combination of a redesigned existing SNCR with a new downstream SCR. N reduction experiments using a hybrid SNCR/SCR process have been conducted in simple NO/N / gas mixtures. Total gas flow rate was kept constant 4 liter/min throughout the SNCR and SCR reactors, where initial N concentration was 500 ppm in the presence of 5% or 15% . Commercial catalysts, -W -S /Ti , were used for SCR N reduction. The residence time and space velocity were around 1.67 seconds and 2,400 or 6000 in SNCR and SCR reactors, respectively. N reduction of the hybrid system was always higher than could be achieved by SNCR alone at a given value of N . Optimization of the hybrid system performance requires maximizing N removal in the SNCR process. An analysis based on the hybrid system performance in this lab-scale work indicates that a equipment with N =500 ppm will achieve a total N removal of about 90 percent with N 5 ppm only if the SNCR N reduction is at least 60 percent. A hybrid SNCR/SCR process has shown about 26∼37% more N reduction than a SNCR unit process in which a lower temperature of 85 turned out to be more effective.be more effective.
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KEYWORD
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Hybrid SNCR/SCR process, SNCR, SCR, NOχ
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