Ammonia (SCR) NOx reduction of choice Catalysts RN-302 some of the effects

Selective catalytic reduction (Selective Catalytic Reduction, SCR) is the principle of the catalyst, a reducing agent under the NH3 290-400 ℃ reduction of NO and NO2 N2, NH3 hardly occurs while the oxidation reaction, thereby increasing the N2 selectivity, reduced consumption of NH3.
System is the SCR catalytic reaction process is the core, with the NH3 purge nozzles and fly ash, flue gas along the catalyst loaded into the SCR reactor, the catalyst surface of the catalytic reduction of NH3 to N2. The SCR catalyst is a key system, the design and selection of the catalyst is determined by the flue gas conditions, the component to determine, influence the design of the three interacting factors removal rate of NOx, NH3 escape rate and volume of catalyst. 2013 is commonly used in commercial vanadium catalyst, such as V2O5/TiO2 and V2O5-WO3/TiO2. Mainly in the form of plate, honeycomb and corrugated plate three. The process in the late 1970s, developed first in Japan, 80 years later, Europe and the United States have been put into industrial applications. In a molar ratio of NH3/NOx is 1, NOx removal rate of 90%, NH3 control the amount of escaping 5 mg / L or less.
As the technology matures and the high denitrification rate, SCR method is now in the world into a large industrial boiler flue gas denitrification mainstream technology. As of the end of 2010, China has put into operation the flue gas denitration unit capacity of more than 200 million kW, accounting for about 28% of the capacity of coal-fired generating units, which accounted for 95% of the SCR unit.
Diesel particulates generated (PM) and nitrogen oxide (NOx) emissions in the two most contaminants. From 2013 to reduce vehicle exhaust emissions technology pathways of view, to reach Euro Ⅳ emission standards, generally no longer from the structural aspects of the engine itself measures are often taken in the exhaust aftertreatment way to reduce pollutant emissions, while Urea-SCR Selective Catalytic Reduction is the most realistic approach, which can reduce NOx in the engine exhaust more than 50%.


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