The combustion process will continue to be one of the main sources of energy for some time. However, this process causes environmental impacts with its use, which brings global problems such as the greenhouse effect and particulate emissions, such as soot. Therefore, studies are needed to make more sustainable and efficient combustion processes. With this in mind, the use of biomass gasification has been studied, resulting in a fuel known as syngas, composed largely of hydrogen and carbon monoxide, which, as it comes from biomass, has a reduced effect on emissions. Studies of combustion are also carried out in lean conditions that allow reduced emissions. In this context, the work aims to present the experimental study of the correlation between syngas use, the oxygen enhanced combustion (OEC) technique in lean conditions with acetylene doping, in a confined diffuse flame and its associated effects on soot formation. The laser light extinction technique was used to measure the concentration of soot. Soot concentration were evaluated in equivalence ratios of 0.7 and 1.0, 21 and 30% of volumetric oxygen content in the oxidant and acetylene doping of 5% (by volume). Analyzing the results in the condition of using OEC associated with lean conditions in syngas burning, it was noticed an increase in the soot concentration trend compared to the result without enrichment.
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