Effect of Exhaust Gas Temperature on Oxidation of Marine Diesel Emission Particulates with Nonthermal-Plasma-Induced Ozone

Kuwahara, Taishi; Yoshida, Keiichiro; Hanamoto, Kenichi; Sato, Kazutoshi; Kuroki, Tetsuo; Okubo, Masaaki

doi:10.1080/01919512.2015.1060881

Cited by 22 publications

(7 citation statements)

References 15 publications

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“…The conventional method of removing PM from DPF requires special reaction conditions, whereas NTP technology can achieve the oxidative PM decomposition at a relatively low temperature. When NTP is introduced into DPF, the particles with strong oxidation activity will cause a series of complex chemical reactions after inelastic collision with other particles, thus removing harmful substances from the DPF. , Scholars have made good progress in researching the effects of NTP on removing PM from DPF. − In a study of the regeneration effect, Babaie et al , injected a diluted diesel exhaust into a dielectric barrier discharge (DBD)-type NTP reactor to perform PM decomposition tests under different discharge voltages. Their study found that the mass removal efficiency of the PM was as high as 43.9% and the quantity removal efficiency of the PM reached more than 70%.…”

Section: Introductionmentioning

confidence: 99%

Effects of Nonthermal Plasma on Microstructure and Oxidation Characteristics of Particulate Matter

Cai

Shi

et al. 2020

Environ. Sci. Technol.

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To investigate the effect of nonthermal plasma (NTP) on the microstructure and oxidation characteristics of particulate matter (PM) from diesel engines at different oxidation stages, a self-designed NTP reactor was used to conduct a timevarying oxidation test on PM samples. The oxidized PM samples were analyzed via thermogravimetric analysis and Raman spectroscopy. The results indicated that the effect of NTP could allow the elemental carbon (EC) to more easily start ignition. The oxidation activity of the EC decreased when the action time of the NTP was less than 5 min. Conversely, when the NTP action time was more than 5 min, the EC oxidation activity gradually increased. When the NTP was active for more than 10 min, it rapidly reacted with the EC, and the oxidation priority of the volatile fraction was higher than that of the EC. During the oxidation process, there are many forms of carbon structures in the particles and they have a mutual transmission relationship. The variation trend of the graphitization degree was consistent with that of the thermogravimetric results, indicating that the degree of graphitization directly affected the PM oxidation activity.

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Section: Introductionmentioning

confidence: 99%

Effects of Nonthermal Plasma on Microstructure and Oxidation Characteristics of Particulate Matter

Cai

Shi

et al. 2020

Environ. Sci. Technol.

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“…It was found that the soot particles were efficiently filtered and that the filters are effectively regenerated during a short term. Kuwahara et al [162] investigated the DPF regeneration with nonthermal-plasma-induced ozone in a marine diesel engine with 750 ppm sulfur fuel. The result showed a possibility of continuous regeneration at the exhaust temperature of 300℃.…”

Section: Pm Removalmentioning

confidence: 99%

A review on regulations, current status, effects and reduction strategies of emissions for marine diesel engines

Wang

2020

Fuel

245

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Marine diesel engines, which provide main power source for ships, mainly contribute to air pollution in ports and coastal areas. Thus there is an increasing demand on tightening the emission standards for marine diesel engines, which necessitates the research on various emission reduction strategies. This review covers emission regulations and emission factors (EFs), environmental effects and available emission reduction solutions for marine diesel engines. Not only the establishment of the emission control areas (ECAs) in the regulations but also many experiments show high concerns about the sulfur limits in fuels, sulfur oxides (SOx) and nitrogen oxides (NOx) emissions. Research results reveal that NOx emissions from marine diesel engines account for 50% of total NOx in harbors and coastal regions. Sulfur content in fuel oil is an important parameter index that determines the development direction of emission control technologies. Despites some issues, biodiesel, methanol and liquefied nature gas (LNG) play their important roles in reducing

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“…Kuwahara et al [16,17] conducted an indirect plasma regeneration DPF experiment on a marine diesel engine. The exhaust gas flowing through the DPF was about 3%-5% of the total exhaust gas of the engine and the PM can be oxidized at 220 °C-300 °C.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the microstructure and elemental occurrence state of residual ash-PM following DPF regeneration by injecting oxygen into non-thermal plasma

Shi¹,

Lu²,

Cai³

et al. 2021

Plasma Sci. Technol.

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Particulate matter (PM) capture tests were carried out on clean diesel particulate filters (DPFs) under different loads (25%, 50%, 75% and 100%). DPFs were regenerated by a non-thermal plasma (NTP) injection device. Raman spectroscopy and x-ray photoelectron spectroscopy were used to investigate changes in the microstructure and element occurrence state of the sediment in DPF channel before and after regeneration. The order of the PM samples decreased before NTP treatment as the load increased; the amorphous carbon content was high, and the oxidation activity was higher. After NTP treatment, the carbon atoms at the edge of the microcrystalline structure in the ash-PM samples were oxidized, and the structure was reorganized; in addition, the amorphous carbon content decreased, and the structure was more diversified. Before NTP, the C element of PM samples was the main component, and the content of the O element was relatively low. The C element occurred in the form of C-C, C-OH, and O-C=O functional groups, and O atoms were mainly combined with C-O. After NTP, the content of Na, P, S, Ca, and other inorganic elements in ash-PM samples was prominent because C atoms were removed by NTP active substances. There were two forms of S element occurrence (SO 4 2− and SO 3 2− ); the proportion of SO 4 2− was approximately 40%, and the proportion of SO 3 2− was approximately 60%. Study of the microstructure and element occurrence of the residues in the DPF channels improved our understanding of the mechanism of the low-temperature regeneration of DPF from NTP.

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Effect of Exhaust Gas Temperature on Oxidation of Marine Diesel Emission Particulates with Nonthermal-Plasma-Induced Ozone

Cited by 22 publications

References 15 publications

Effects of Nonthermal Plasma on Microstructure and Oxidation Characteristics of Particulate Matter

Effects of Nonthermal Plasma on Microstructure and Oxidation Characteristics of Particulate Matter

A review on regulations, current status, effects and reduction strategies of emissions for marine diesel engines

Analysis of the microstructure and elemental occurrence state of residual ash-PM following DPF regeneration by injecting oxygen into non-thermal plasma

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