Numerical simulation of urea based selective non-catalytic reduction deNOx process for industrial applications

Baleta, Jakov and Mikulčić, Hrvoje and Vujanović, Milan (2015) Numerical simulation of urea based selective non-catalytic reduction deNOx process for industrial applications. = Numerical simulation of urea based selective non-catalytic reduction deNOx process for industrial applications. In: 10th Conference on Sustainable Development of Energy, Water and Environment Systems - SDEWES, 27.09.2015.-02.10.2015., Dubrovnik, Hrvatska.

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Official URL: http://bib.irb.hr/prikazi-rad?&rad=779866

Abstract

Industrial processes emit large amounts of diverse pollutants into the atmosphere, among which NOx takes a significant portion. Selective non-catalytic reduction (SNCR) is a relatively simple method for the NOx reduction in large industrial facilities such as power plants, cement plants and waste incinerators plants. It consists of injecting the urea-water solution in the hot flue gas stream and its reaction with the NOx. 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. In order to cope with the ever stringent environmental norms, equipment manufacturers need to develop energy efficient products that are at the same time benign to environment. This is becoming increasingly complicated and costly, and one way to reduce production costs together with the maintaining the same competitiveness level is to employ computational fluid dynamics (CFD) as a tool, in a process today commonly known under the term “virtual prototyping”. The aim of this paper is to show capabilities of the developed mathematical framework implemented in the commercial CFD code Fire to simulate physical processes of all relevant phenomena occurring during the SNCR process. First, mathematical models for description of SNCR process are presented and afterwards, models are used on the 3D geometry of real industrial case to predict SNCR efficiency, temperature and velocity field. Influence of the main operational parameters on NOx reduction efficiency was performed on the same case. Finally, conclusions about validity of current framework are given together with recommendations for further work.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): computational fluid dynamics, NOx reduction, selective non-catalytic reduction, reaction kinetics, urea-water solution, Lagrangian spray
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: No
Indexed in Current Contents: No
Date Deposited: 14 Apr 2016 11:07
Last Modified: 20 Mar 2017 16:02
URI: http://repozitorij.fsb.hr/id/eprint/5637

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