Study of Nox Treatment with Selective Catalytic Reduction and Diesel Exhaust Fluid with Emphasis on Importance of Mixer in Flow. - Y. Lethwala


This blog deals with chemical reactions of nitrogen oxide formation
at higher temperatures, when the stable nitrogen disintegrates and forms unstable
compounds. It discusses the effect of the unstable nitrogen compounds on human
health and environment. To meet Bharat Stage VI norms, which will be implemented
in the year 2020, NOx reduction techniques such as alteration in engine operation,
changes in engine design, alteration in fuel, after treatment of exhaust have been
discussed. Focus on after treatment of exhaust gas, by use of selective catalytic
reduction, with problems of urea decomposition, and the effect of further higher
temperature on urea was given. Properties of diesel exhaust fluid and factors affecting
NOX reduction such as droplet size, droplet behaviour, urea decomposition, urea
deposits, injector positions, vaporization rate, and mixer designs are also discussed.
Test method to obtain the best dynamic or static mixture increasing the urea exhaust
mixing for better ammonia formation and NOx reduction was also carried out.


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