Effects of exhaust gas recirculation on low temperature combustion using wide distillation range diesel

The experiments were performed using a modified six-cylinder turbocharged direct injection diesel engine with diesel of different distillation ranges to investigate the effects of (exhaust gas recirculation) EGR on engine performance and emission characteristics of low-temperature combustion engine. The results showed that for the same fuel, with the increase of the EGR rate, the cylinder pressure remained almost unchanged. Increasing the EGR rate slowed the combustion, the peak value of heat release rate increased and the indicated thermal efficiency decreased. The peak value of heat release rate increased with the decline of the initial boiling point at the same EGR rate. The ignition delay of combustion increased with the decrease of initial boiling point. When EGR rate was low, the level of HC and CO emission was low, while the HC and CO emission increased rapidly with the increase of EGR. The NOx emission was reduced with the increase of the EGR rate. The study also showed that the wide distillation range diesel can reduce emission over diesel in low temperature combustion. Wide distillation range fuel had potential to reduce soot emission at different EGR for low temperature combustion engine.

► We distill the blend of gasoline and diesel again to form a new distillation range fuel. ► The experiments were performed to optimize the low temperature combustion using the new fuel. ► The exhaust gas recirculation rate was investigated to reduce the emission of low temperature combustion. ► The wide distillation range diesel has potential to improve thermal efficiency and reduce emission.