Browse Publications Technical Papers 2020-01-0374
2020-04-14

Impact of post injection parameters on soot and hydrocarbon emissions in a common-rail heavy-duty diesel engine 2020-01-0374

In this paper, based on a direct-injection diesel engine, soot and exhaust gaseous emissions were measured by a smoke meter and multi-component gas Fourier Transform Infrared Spectroscopy (FTIR) analyzer under post injection condition. The post injection timing was changed form 20°CA after top dead center (ATDC) to 120°CA ATDC, and the post injection mass was set to either 5mg, 10mg or 15mg, to find a suitable post-injection strategy in a wide assessment range based on diesel oxidation catalyst (DOC) coupled diesel particle filter (DPF) after-treatment technology demands, considering emission reduction and after-treatment gas atmosphere investigation. The results showed that post injection can achieve NOx emissions reduction, up to 14%. In addition, post injection led to worsening soot emissions, and more hydrocarbon (HC)emissions were detected compared to condition without the post injection. With the post injection, higher concentration of unsaturated HC emissions (such as C2H2, C2H4 and C3H6), formaldehyde (HCHO) and acetaldehyde (CH3CHO) appeared at late post injection (after 70°CA). In the measured components, at 80°CA post injection timing and with 10mg post injection mass, species with low emissions (<30ppm), included CH4, C2H2, C3H6, and CH3CHO; species with moderate emissions (>30ppm and <100ppm), included NO2, HCHO, C2H4 and NC8; species with large emissions (>100ppm), included NO, NOx and Non-methane hydrocarbon (NMHC). Furthermore, the peak position of NMHC was same as C3~C8 HCs and different from C2 HCs within the scope of the experiment, which indicated that, in terms of concentration, the proportion of C2 HCs had no significant advantage.

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