Abstract
Polyoxymethylene dimethyl ether (PODEn) is a promising diesel additive, especially in particulate matter reduction. However, how PODEn addition affects the filtration efficiency and regeneration process of a catalytic diesel particulate filter (cDPF) is still unknown. Therefore, this experimental work investigated the size-dependent particulate number removal efficiency under various engine loads and exhaust gas recirculation (EGR) ratios when fueling with diesel (D100) and diesel/PODEn mixture (P10). In addition, the regeneration behavior of the cDPF was studied by determining the breakeven temperatures (BETs) for both tested fuels. The results showed that the cDPF had lower removal efficiencies in nucleation mode particles but higher filtration efficiencies in accumulation mode particles. In addition, the overall filtration efficiency for P10 particles was higher than that for D100 particles. Positioning the upstream cDPF, increasing the EGR ratio slightly decreased the number concentration of nucleation mode particles but greatly increased that of accumulation mode particles. However, increasing the EGR ratio decreased the removal efficiency of nanoparticles, and this effect was more apparent for the P10 case. Under the same period of soot loading, the pressure drop of P10 fuel was significantly lower than that of diesel fuel. In addition, a significantly lower BET was observed for the P10 fuel, in comparison with D100 fuel. In conclusion, adopting cDPF is beneficial for fueling with P10 in terms of the overall filtration efficiency in the particulate number and the lower input energy requirement for active regeneration. However, with the addition of EGR, the lower filtration efficiencies of nanoparticles should be concerned, especially fueling with diesel/PODEn mixture.
Highlights
Diesel engines are a major source of nitrogen oxides (NOx) and particulate matter (PM) emissions due to the nature of mixing-controlled combustion
This work investigated the size-dependent filtration efficiency and regeneration behavior of a catalytic diesel particulate filter (cDPF) when fueling with diesel fuel and diesel/PODEn mixture
As expected, employing cDPF is an effective approach to reducing the particulate numbers for both fuels
Summary
Diesel engines are a major source of nitrogen oxides (NOx) and particulate matter (PM) emissions due to the nature of mixing-controlled combustion. Whereas at a medium load, Chen et al [23] stated that retarded injection timing reduced the PNC for diesel/PODEn blends It can be seen from the discussions above that adjusting the injection parameters may not be an effective approach for the reduction of PM and PN emissions with the use of diesel/PODEn mixture. Zhang et al [32] studied the effect of PODEn addition on the performances of a diesel oxidation catalyst (DOC) and catalytic diesel particulate filter (cDPF) after-treatment system. The results showed that the pressure drop of the cDPF can be greatly reduced by fueling with diesel/PODEn mixture, and the active regeneration frequency can be effectively decreased. The obtained results in this work can provide new insights for the filtration and regeneration optimization of the cDPF with the use of the diesel/PODEn blend
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