Experimental Investigation on the DPF High-Temperature Filtration Performance under Different Particle Loadings and Particle Deposition Distributions

Abstract

Based on DPF filtration and regeneration bench, the solid particle emission and high-temperature filtration characteristics of different carbon black particle loadings and particle deposition distributions are studied. The aerosol generator (PAlAS RGB 1000) is used to introduce carbon black particles into the inlet of a DPF, and the NanoMet3 particle meter is used to measure the solid particle concentration at the inlet and outlet of a DPF to obtain the filtration characteristics. Previous studies found that without inlet carbon black particles, there was an obvious solid particle emission peak at the outlet of the deposited DPF during the heating, and the concentration increased by 1–2 orders of magnitude. In this paper, the high-temperature filtration characteristics under steady-state temperature conditions are studied. It is found that a DPF can reduce the range of inlet fluctuating particles, and with the increase of temperature, the proportion of large solid particles in the outlet particles increases, and the size distribution range decreases. Particle loading has positive and negative effects on the DPF filtration, and the DPF has the optimal particle loading, which makes the comprehensive filtration efficiency improve the highest. The deposition transition section can make the deposition particles in the DPF uniform, but the filtration efficiency is reduced.

Impact of Active Diesel Particulate Filter Regeneration on Carbon Dioxide, Nitrogen Oxides and Particle Number Emissions from Euro 5 and 6 Vehicles under Laboratory Testing and Real-World Driving

“…The exact characteristics of the emitted particles depend strongly on the conditions of the regeneration (temperature, duration, soot loading) [46] and the findings vary when different sizes are examined, as well as when volatiles are taken into account [11,22,27,46]. It should be kept in mind that engine-out particle characteristics also vary during the DPF regeneration [46], as the engine operates in a different mode (e.g., closed EGR valve, fuel post-injection), and both engine-out and deposited particles can be blown out during the regeneration process [47]. When solid particles larger than 23 nm are considered, then two phases can be distinguished, as shown in Figure 3, the initial heating part where emissions remain low, followed by the high emissions phase where particles are oxidised and exhausted and also go through the DPF due to the lower filtration efficiency.…”

Overview of Vehicle Exhaust Particle Number Regulations

“…However, SPN emissions during regeneration events and immediately after are very high and can bring the weighted emissions close to the current limit. Thus, filtration efficiencies and regeneration strategies need to be carefully assessed for future regulation [72][73][74][75][76][77].…”

Hydrophobic Black Carbon Capture from Ship Emissions Based on a Charger-Coupled Wet Scrubber

“…The nature of the actual ship-emitted black carbon is closely related to the engine type, size, fuel composition, and operational conditions. Studies by Meng et al, − Boger et al, Pfau et al, and other researchers suggest that considering carbon black, notably Printex-U carbon black, as a viable substitute for black carbon (BC) is plausible, particularly in the context of diesel soot exhibiting similar physical traits and featuring high elemental carbon content. This research plays a vital role in the development of ship-based BC emission control.…”