Numerical analysis of ammonia homogenization for selective catalytic reduction application

Baleta, Jakov and Martinjak, Matija and Vujanović, Milan and Pachler, Klaus and Wang, Jin and Duić, Neven (2017) Numerical analysis of ammonia homogenization for selective catalytic reduction application. = Numerical analysis of ammonia homogenization for selective catalytic reduction application. Journal of environmental management. ISSN 0301-4797. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. Kvartili JCR: Q1 (2016). Točan broj autora: 6. (In Press)

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Selective catalytic reduction based on urea water solution as ammonia precursor is a promising method for the NOx abatement form exhaust gasses of mobile diesel engine units. It consists of injecting the urea-water solution in the hot flue gas stream and reaction of its products with the NOx over the catalyst surface. During this process flue gas enthalpy is used for the urea-water droplet heating and for the evaporation of water content. After water evaporates, thermolysis of urea occurs, during which ammonia, a known NOx reductant, and isocyanic acid are generated. The uniformity of the ammonia before the catalyst as well as ammonia slip to the environment are important counteracting design requirements, optimization of which is crucial for development of efficient deNOx systems. The aim of this paper is to show capabilities of the developed mathematical framework implemented in the commercial CFD code AVL FIRE®, to simulate physical processes of all relevant phenomena occurring during the SCR process including chemical reactions taking part in the catalyst. First, mathematical models for description of SCR process are presented and afterwards, models are used on the 3D geometry of a real SCR reactor in order to predict ammonia generation, NOx reduction and resulting ammonia slip. Influence of the injection direction and droplet sizes was also investigated on the same geometry. The performed study indicates importance of droplet sizes on the SCR process and shows that counterflow injection is beneficial, especially in terms of minimizing harmful ammonia slip to environment.

Item Type: Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian): Computational fluid dynamics ; NOx reduction ; Selective catalytic reduction ; Spray preparation ; Urea-water solution ; Ammonia slip
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 500 Department of Energy, Power Engineering and Environment > 510 Power Engineering and Energy Management Chair
Indexed in Web of Science: Yes
Indexed in Current Contents: Yes
Quartiles: Q1 (2016)
Date Deposited: 08 Sep 2017 07:46
Last Modified: 08 Sep 2017 07:46

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