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Catalysts 2017, 7(10), 307;

Concept of Vaporized Urea Dosing in Selective Catalytic Reduction

BOSMAL Automotive Research & Development Institute Ltd., 43-300 Bielsko-Biala, Poland
Faculty of Mechanical Engineering, Cracow University of Technology, 31-864 Cracow, Poland
Author to whom correspondence should be addressed.
Received: 7 September 2017 / Revised: 28 September 2017 / Accepted: 13 October 2017 / Published: 19 October 2017
(This article belongs to the Special Issue Selective Catalytic Reduction of NOx)
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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. View Full-Text
Keywords: urea; vapor; ammonia; nitrogen oxides; catalytic reduction urea; vapor; ammonia; nitrogen oxides; catalytic reduction

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Sala, R.; Bielaczyc, P.; Brzezanski, M. Concept of Vaporized Urea Dosing in Selective Catalytic Reduction. Catalysts 2017, 7, 307.

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