Impact of enhanced oxygen levels on cyclic variability and performance parameters in a diesel engine fuelled by food waste-derived biogas

Document Type

Article

Publication Title

E Prime Advances in Electrical Engineering Electronics and Energy

Abstract

The global push to reduce fossil fuel dependence and minimize environmental impact has heightened interest in renewable alternatives like biogas. Despite its promise, dual-fuel diesel engines operating with biogas often face challenges such as reduced efficiency, unstable combustion, and elevated emissions. This study evaluates the impact of oxygen enrichment ranging from 21% to 27% by volume on the performance, combustion stability, and emission behavior of a 5.2 kW single-cylinder diesel engine running in dual-fuel mode with 50% food waste-derived biogas (BG50). Oxygen was introduced through the intake manifold in 2% increments across various engine loads. The findings reveal that oxygen enrichment significantly improved combustion by shortening ignition delay, reducing cyclic variations, and boosting power and thermal efficiency. At 27% oxygen, brake thermal efficiency increased by 18.37%, brake power by 22.22%, and peak cylinder pressure by 27.16% compared to unenriched BG50. Emissions of carbon monoxide and unburnt hydrocarbons were reduced by 20% and 27.27%, respectively, while nitrogen oxide emissions rose by 46.61% at full load. Cyclic variability, measured through the coefficient of variation of indicated mean effective pressure and peak pressure, decreased to below 2%, indicating improved combustion consistency. This study provides a novel and comprehensive quantitative analysis of oxygen-enriched biogas combustion and offers critical insights for optimizing engine performance in sustainable energy applications, while highlighting the need to manage NOx emissions.

DOI

10.1016/j.prime.2025.101116

Publication Date

12-1-2025

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