Eventos Anais de eventos
CONEM 2022
XI Congresso Nacional de Engenharia Mecânica - CONEM 2022
Influence of hydrogen addition on the steric factor of natural gas/hydrogen mixtures
Submission Author:
Edwin Santiago Rios Escalante , SP , Peru
Co-Authors:
Edwin Santiago Rios Escalante, João Carvalho
Presenter: Edwin Santiago Rios Escalante
doi://10.26678/ABCM.CONEM2022.CON22-0421
Abstract
Currently, the intense consumption of fossil fuels has caused an increase in greenhouse gases emissions into the atmosphere. For this reason, alternative energy sources are being considered as partial or total substitutes for these fuels. Hydrogen (H_2) is the most promising fuel gas due to its different production routes such as steam reforming of methane, gasification and electrolysis of water. Thus, several investigations have focused on the possibility of mixing hydrogen with natural gas (NG) as an alternative for the generation of clean energy. On the other hand, chemical kinetic is one of the most important fundamentals that is closely related to the ignition and extinction of the flame. In this context, the identification of detailed pathways that convert reactants to products has made it possible to advance the field of combustion. However, the reactants are not converted directly into products, but intermediate products are obtained. Thus, the set of elementary reactions used to describe the global reaction is called chemical kinetic mechanisms. Most of the elementary reactions relevant to combustion are bimolecular, i.e., two molecules collide and react to become two different molecules. This event can be evaluated taking into account two very important factors, that is; 1) activation energy and 2) steric factor, both factors are part of the collision theory. The objective of this work was to evaluate the prediction of collision theory in the combustion process of hydrogen/natural gas mixtures through the steric factor. Besides, a detailed mathematical model was provided for the calculation of the adiabatic flame temperature under lean stoichiometric conditions, as well as its effect on the steric factor. The results showed that by adding hydrogen to the natural gas/hydrogen mixture, the steric factor decreases. On the other hand, as the equivalence ratio increases, the steric factor decreases, therefore, increasing the adiabatic flame temperature there is a decrease in the steric factor.
Keywords
Steric factor, Collision theory, Hydrogen, natural gas, mixtures
