Particle emissions characterization from a medium-speed marine diesel engine with two fuels at different sampling conditions

Ntziachristos, Leónidas; Saukko, Erkka; Lehtoranta, Kati; Rönkkö, Topi; Timonen, Hilkka; Simonen, Pauli; Karjalainen, Panu; Keskinen, Jorma

doi:10.1016/j.fuel.2016.08.091

Cited by 59 publications

(36 citation statements)

References 57 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In order to confirm laboratory findings, the efficiency of TD and CS in removing exhaust volatile and semivolatile nanoparticles was studied by employing marine diesel exhaust sampling. Marine exhaust aerosol comprises significant quantities of sulfate, organic, refractory ash, and carbonaceous material (Ntziachristos et al 2016). Figure 6 demonstrates the mass concentration of these pollutants when the engine operated at 25% load with a moderate (780 mg/kg) and a high (3750 mg/kg) sulfur fuel.…”

Section: Marine Exhaust Aerosolmentioning

confidence: 99%

“…This may result in measurement artifacts related to the VPRs performance, which is especially true in the sub-23 nm size range where nucleation is highly sensitive to sampling conditions. Several studies report the use of TDs to study marine exhaust PM volatility (Moldanov a et al 2013;Anderson et al 2015;Ntziachristos et al 2016;Eichler et al 2017), while many report sub-30 nm nuclei particles that survive TD treatment (Jonsson et al 2011;Pirjola et al 2014;Winnes et al 2014;Westerlund et al 2015). In such cases, it is difficult to distinguish whether the remaining particles are actually non-volatile or a sampling artifact such as re-nucleation of semi-volatile compounds.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols

Amanatidis

Ntziachristos

Karjalainen

et al. 2018

Aerosol Science and Technology

View full text Add to dashboard Cite

The performance of a thermal denuder (thermodenuder-TD) and a fresh catalytic stripper (CS) was assessed by sampling laboratory aerosol, produced by different combinations of sulfuric acid, octacosane, and soot particles, and marine exhaust aerosol produced by a medium-speed marine engine using high sulfur fuels. The intention was to study the efficiency in separating non-volatile particles. No particles could be detected downstream of either device when challenged with neat octacosane particles at high concentration. Both laboratory and marine exhaust aerosol measurements showed that sub-23 nm semi-volatile particles are formed downstream of the thermodenuder when upstream sulfuric acid approached 100 ppbv. Charge measurements revealed that these are formed by re-nucleation rather than incomplete evaporation of upstream aerosol. Sufficient dilution to control upstream sulfates concentration and moderate TD operation temperature (250 C) are both required to eliminate their formation. Use of the CS following an evaporation tube seemed to eliminate the risk for particle re-nucleation, even at a tenfold higher concentration of semi-volatiles than in case of the TD. Particles detected downstream of the CS due to incomplete evaporation of sulfuric acid and octacosane aerosol, did not exceed 0.01% of upstream concentration. Despite the superior performance of CS in separating non-volatile particles, the TD may still be useful in cases where increased sensitivity over the traditional evaporation tube method is needed and where high sulfur exhaust concentration may fast deplete the catalytic stripper adsorption capacity.

show abstract

Section: Marine Exhaust Aerosolmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols

Amanatidis

Ntziachristos

Karjalainen

et al. 2018

Aerosol Science and Technology

View full text Add to dashboard Cite

show abstract

“…Results are shown in Figure 11. It shows that there is a good relationship between the local pressure gradient and the maximum filtration velocity described by Equation (6). Two locations for each sample where the filtration velocity was locally the maximum were selected.…”

Section: Discussionmentioning

confidence: 99%

“…Figure 8 shows the maximum filtration velocity measured in each YZ plane. The filtration velocity of U is expressed by U = (u x 2 + u y 2 + u z 2 ) 1/2 (6) where u x , u y , u z are velocity components. Surprisingly, the maximum velocity was over 15 cm/s in sample 4, which exhibited the highest filter backpressure.…”

Section: Flow Field and Filter Backpressurementioning

confidence: 99%

“…As a countermeasure for the reduction of PM emissions, a well-known diesel filter (diesel particulate filter, DPF) is used. It is a very efficient device for particle filtration [4][5][6]. Resultantly, the combustion-generated nanoparticles, mainly from the internal combustion engine, are removed [7][8][9][10][11], but inevitably, the deposited particles could be a barrier or block for the flow during the filtration, and the unexpected pressure rise may worsen the fuel consumption rate as well as the available torque.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Numerical Simulation on Flow Dynamics and Pressure Variation in Porous Ceramic Filter

Yamamoto

Toda

2018

Computation

View full text Add to dashboard Cite

Using five samples with different porous materials of Al 2 TiO 5 , SiC, and cordierite, we numerically realized the fluid dynamics in a diesel filter (diesel particulate filter, DPF). These inner structures were obtained by X-ray CT scanning to reproduce the flow field in the real product. The porosity as well as pore size was selected systematically. Inside the DPF, the complex flow pattern appears. The maximum filtration velocity is over ten times larger than the velocity at the inlet. When the flow forcibly needs to go through the consecutive small pores along the filter's porous walls, the resultant pressure drop becomes large. The flow path length ratio to the filter wall thickness is almost the same for all samples, and its value is only 1.2. Then, the filter backpressure closely depends on the flow pattern inside the filter, which is due to the local substrate structure. In the modified filter substrate, by enlarging the pore and reducing the resistance for the net flow, the pressure drop is largely suppressed.

show abstract

Effects of fuel types and fuel sulfur content on the characteristics of particulate emissions in marine low-speed diesel engine

Shen

2019

Environ Sci Pollut Res

View full text Add to dashboard Cite

Particle emissions characterization from a medium-speed marine diesel engine with two fuels at different sampling conditions

Cited by 59 publications

References 57 publications

Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols

Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols

Numerical Simulation on Flow Dynamics and Pressure Variation in Porous Ceramic Filter

Effects of fuel types and fuel sulfur content on the characteristics of particulate emissions in marine low-speed diesel engine

Contact Info

Product

Resources

About