Journal
CATALYSTS
Volume 7, Issue 10, Pages -Publisher
MDPI AG
DOI: 10.3390/catal7100307
Keywords
urea; vapor; ammonia; nitrogen oxides; catalytic reduction
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Funding
- Engine Testing Laboratory at BOSMAL R&D Institute based in Bielsko-Biala, Poland
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This work tried to identify the influence of dosing vaporized urea solution in a selective catalytic reduction (SCR) system. In the SCR method, optimising the urea evaporation and mixing properties can significantly improve the NOx conversion efficiency in the catalyst. It can also exert a positive effect on the uniformity of NH3 concentration distribution across the catalyst face. The concept of an electrically evaporated urea-dosing system was investigated and it was found that urea pre-heating prior to introduction into the exhaust gas is favourable for enhancing NOx removal under steady-state and transient engine operation. In the urea evaporating system the heating chamber was of a cylindrical tube shape and the urea vapour was introduced into the exhaust by means of a Venturi orifice. The concept urea dosing was only a custom-made solution, but proved to be superior to the regular dosing system operating in the liquid phase.
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