Production of waste tyre pyrolysis oil as the replacement for fossil fuel for diesel engines with constant hydrogen injection via air intake manifold

The increasing global demand for alternative fuels as a replacement for fossil fuels has sparked a surge in the use of non-fossil fuel sources. While many alternative fuels already offer improved performance characteristics, ongoing research seeks to further enhance their quality. This particular study focuses on elevating fuel quality by introducing hydrogen into waste tire pyrolysis oil. To conduct the investigation, experimental tests were performed using three different fuel combinations: standard diesel, 15% (W15) waste tire pyrolysis oil blends, and 30% (W30) biodiesel blends. Additionally, each of these blends was enriched with 5 L/min of hydrogen gas. The experiments were conducted in a naturally aspirated, direct injection, four-cylinder, inline, four-stroke diesel engine, operating at various speeds of 1000 rpm, 1500 rpm, 2000 rpm, and 2500 rpm. The study assessed the parameters such as torque, power, specific fuel consumption, carbon monoxide, carbon dioxide, and nitrogen oxide emissions. Furthermore, this research explored the viability of utilizing waste tire pyrolysis oil blends with hydrogen as fuel in compression ignition engines without any modifications, as their fuel qualities were observed to be comparable to standard diesel fuel. Encouragingly, the results indicated that the addition of hydrogen to waste tire pyrolysis biodiesel improved the combustion process and led to a reduction in harmful gas emissions. Despite waste tyre pyrolysis oil possessing a lower heating value in comparison to diesel, the findings revealed that this heating value could be effectively enhanced by introducing hydrogen through the engine's inlet manifold. Among the blends tested, W15 emerged as a particularly promising alternative fuel for diesel engines due to its favorable performance and reduced environmental impact, as evidenced by lower carbon monoxide, carbon dioxide, and nitrogen dioxide emissions.