CHEMICAL KINETIC MODELING OF HYDROGEN-ENRICHED NATURAL GAS BLEND OXIDATION

Abstract

Natural Gas Vehicles fueled with a new fuel made of a hydrogen/natural gas blends (HCNG) is being considered as initial step towards hydrogen economy. Small percentage of hydrogen mixed into compressed natural gas (CNG) is known to improve emissions performance of Internal Combustion Engine (ICE) powered compressed natural gas vehicles (CNGVs). Indeed the chemical kinetics effect of hydrogen addition on methane or natural gas chemical reaction process was not well understood. Although the chemical kinetic mechanism of both methane and hydrogen are reasonably well understood, but the combination of methane and hydrogen in goal to form a new fuel may demonstrate different behavior. In the same vein, the objective of this study is to clarify the behaviors of engine fueled with HCNG mixtures blend of 8 % hydrogen in natural gas by volume, to analyze the influence of chemical kinetics on the combustion efficiency, other to confirm the feasibility of using blends of hydrogen and natural gas to improve the performance, controllability and emissions of CNG engines. The chemical kinetic modeling of combustion in the presented blended Fuel, we enabled us to examined the possibility of increases of the natural gas blend reactivity with this proportion auditing and his effect on reducing the ignition delay of the mixture in comparison with higher proportions of hydrogen addition in the mixture, and to calculate the reaction order to determine the species and intermediate radicals involved in this reaction mechanism