Reactions of NH3 with NO in coal-derived combustion products

Selective Noncatalytic Reduction of NOx Using Ammonium Sulfate

“…The SNCR process is known to be strongly temperature dependent, with a narrow temperature window of effective NO reduction, typically located around 850–1100 °C. The process has been studied extensively in the past and is considered a mature technology for NO x reduction in stationary sources. , Previous studies have shown that important process parameters for SNCR include temperature, residence time, injection rate of the chemical reducing agent, mixing of reagent with the flue gas, , oxygen concentration, , and presence of combustibles. − Also the impact of alkali metals − and SO 2 has been investigated. − …”

Research of the SNCR Process and its Application

“…Normalized stoichiometric ratio (NSR) refers to the ratio between the molar ratio and equivalent molar ratio of active ingredient in ammonia and nitrogen oxides in flue gas. When ammonia is used as the reducing agent, Muzio et al [6,13] find that the SNCR denitrification efficiency significantly increases with NSR. Lucas et al [16] find that the optimum reaction temperature of fuel oil burner SNCR increases with NSR.…”

Experimental Study of the Enhancement of the Selective Noncatalytic Reduction Denitrification Process with Methane and Propane in a Circulating Fluidized Bed

“…NOx will be reduced to harmless N 2 by the reducing agents. Compared to other de-NOx technologies such as selective catalytic reduction (SCR), SNCR is superior because (1) there is a low investment cost because no catalysts are used in the reaction process, which can also prevent the transformation of SO 2 to SO 3 in conventional SCR, and (2) the reaction temperature range, known as the temperature window, is suitable for the direct injection of the reducing agents into the furnace. , Despite the aforementioned advantages of SNCR, the de-NOx efficiency is merely approximately 30–60%, and it is sensitive to the change in temperature. − …”