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Catalysts 2017, 7(10), 307; doi:10.3390/catal7100307

Concept of Vaporized Urea Dosing in Selective Catalytic Reduction

1
BOSMAL Automotive Research & Development Institute Ltd., 43-300 Bielsko-Biala, Poland
2
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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Abstract

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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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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