Effect of excess oxygen in plasma reforming of diesel fuel

摘要

This study investigated the plasma reforming process for diesel focusing on the relative ratio of oxygen to fuel. Excess O_2 in the partial oxidation process is known to increase the combustion portion, resulting in a decreased yield of H_2 and CO. However, in this parametric investigation, there was no apparent decrease in the H_2 and CO selectivity. Adding O_2 did not increase the portion of combustion in the overall reaction. Rather, an excess O_2 supply from partial oxidation stoichiometry resulted in an increase in CO_2 selectivity without a reduction in CO selectivity. Heavy hydrocarbon species were identified as a source of CO_2 in excess O_2 conditions due to preferential oxidative cracking. The additional oxidation of C_1-C_4 species by excess O_2 provided a minor contribution to CO_2. Excess O_2 affects soot generation characteristics by suppressing the agglomeration of soot particles, resulting in smaller particle generation. However, the oxidation of soot particles does not provide a major contribution to increasing the CO_2 selectivity. The results show that in a real reforming process, controlling the O_2 supply does not have a strong effect on the process selectivity of hydrogen.