Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
THE FORMATION OF NITRIC OXIDE IN FLAMES: A NUMERICAL ASSESSMENT USING DETAILED CHEMICAL KINETICS
Submission Author:
Vinicius Rugeri Borges Bonini , SC , Brazil
Co-Authors:
Vinicius Rugeri Borges Bonini, Moisés Sousa, Kathleen Mayara Balestrin, Jônatas Vicente, Leonel R Cancino
Presenter: Vinicius Rugeri Borges Bonini
doi://10.26678/ABCM.COBEM2021.COB2021-1185
Abstract
Nitric oxide (NO) emissions derived from combustion process, is a topic of great concern due to the environmental impact caused by this pollutant. In recent years, strict governmental regulatory policies have been implemented, aiming to reduce environmental damages. In this sense, there is a demand to understand how these chemical compounds are formed along the combustion. Numerical approach of combustion processes is extensively used to understand these phenomena, where mathematical models validated with experimental data are used. Numerically, the chemical kinetics behind a combustion process can be represented by kinetics models (detailed, skeletal, or global models) in which a set of chemical reactions describes the kinetics evolution of chemical species, step by step, along the combustion process. Regarding the formation of NOX compounds, it occurs through five known routes, which depend on the thermochemical conditions of mixture. These routes are: thermal-NO (Zeldovich), the prompt-NO (Fenimore), the route intermediated by nitrous oxide (N2O), the NNH mechanism and the formation through the nitrogen from the fuel. In this work, experimental NOX-related data (in the post-flame region) available in the literature for small hydrocarbons and alcohols was collected and used for validation of detailed kinetics models also available in the literature. It was identified that there are some disagreements between the results calculated by different models and the experimental data found in the literature, additionally, not all the NOX formation routes are available in the kinetics models analyzed in this work. Multicomponent transport, thermal diffusion (Soret effect) and radiative heat losses were leave into account for the calculations in the CANTERA software. Along this process, the detailed kinetics models were tested and tuned by using several analysis techniques, pointed out the more influencing chemical reactions in the mechanism and allowing of this form possibilities of Arrhenius parameters up-grade in the detailed kinetics model.
Keywords
Nitric oxide, detailed chemical kinetics models, CANTERA software
