Theoretical study on the effect of low-temperature reforming on gasoline compression ignition (GCI) at low-load conditions

Abstract

In this paper, the influence of reforming conditions on the reforming products of gasoline, as well as the effect of main reforming products on GCI combustion at low-load conditions has been studied by experiment and numerical simulation. The results show CO, H2 and CH4 are the major reforming products, and their production is improved by higher reforming temperature, oxygen concentration and reforming time. The production of CO and H2 is mainly determined by the dehydrogenation reaction between fuel molecules and OH, while the one between iC8H18 and O2 is essential for the CH4 generation. The combustion efficiency rises sharply with more CO addition, but increases first and then decreases with increased H2, while the peak value of 96.71% is achieved. Besides, higher combustion efficiency is obtained with more internal exhaust gas recirculation (i-EGR) used. The increased OH and H radicals can be attained by adding CH4, which further improves combustion efficiency.