Effect of H2 additive on SNCR denitrification characteristics
The denitrification characteristics of selective non-catalytic reduction(SNCR)in a tubular furnace were explored.The effects of with and without additive H2 under different normalized stoichiometric ratio(NSR)on NO removal process of SNCR and the emission of N2O,NO,NH3,and SO2 were investigated.The results showed that without additives,the maximum reduction efficiency of NO exceeded 90%occurs at temperature of 870 ℃ and NSR of 2.0.The variation trends of N2O emission and NO reduction efficiency are similar.The larger the NSR,the bigger the SNCR efficiency,and the larger the N2O emission.The temperature window of NO reduction is almost the same as that of N2O generation.The escape amount of NH3 increases on left of its temperature window and tends to zero on right of it.SO2 is contrary to NH3 with increase of temperature.As H2 addition is increasing,the NO reduction temperature window widens significantly and shifts to low temperature.The maximum NO reduction efficiency after adding H2 exceeds 90%at 820℃.N2O rises first with increment of temperature and then declines.With H2 addition,N2O ascends in low temperature zone and its peak moves towards low temperature zone and its temperature window broadens.NH3 escape amount rises first with increment of temperature and then declines which is apparent in low temperature zone.As it is over 800℃,NH3 escape tends to zero whatever addition of H2 or not.It is not apparent for the effect of addition of H2 on SO2 concentration.SO2 is opposite to NH3 as the temperature rises.
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