Pilot-Scale Aftertreatment Using Nonthermal Plasma Reduction of Adsorbed NOx in Marine Diesel-Engine Exhaust Gas

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

doi:10.1007/s11090-013-9486-0

Cited by 37 publications

(35 citation statements)

References 26 publications

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“…The system energy efficiency η system can be improved by optimization studies. The results obtained with an improved aftertreatment are reported with another diesel engine in the literature [28].…”

Section: No X Reduction By Ntp Treatmentmentioning

confidence: 71%

“…The system energy efficiency could still be improved. The results obtained with an improved aftertreatment are reported in the literature [28]. This system does not use any rare or precious-metal catalysts, harmful ammonia, or urea solution.…”

Section: Discussionmentioning

confidence: 85%

“…In this paper, a pilot-scale aftertreatment is developed for total (= NO x + PM) marine diesel emission control based on our previous studies on NO x reduction using NTP combined with an adsorption process [26]- [28] and DPF regeneration using plasma-induced ozone injection [7]- [9]. Compared to SCR, this technology offers the advantages of being free of urea or harmful heavy-metal catalysts, as well as having low operating temperatures of less than 150 • C.…”

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confidence: 99%

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A Pilot-Scale Experiment for Total Marine Diesel Emission Control Using Ozone Injection and Nonthermal Plasma Reduction

Kuwahara

Yoshida

Hanamoto

et al. 2015

IEEE Trans. on Ind. Applicat.

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Due to the fact that it is difficult to fulfill the recent stringent regulations governing marine diesel engine emission by means of combustion improvement alone, an effective aftertreatment technology is required to achieve the efficient simultaneous removal of NO x and particulate matter (PM). In the present study, we designed and investigated an effective aftertreatment system that employs a combination of ozone injection and nonthermal plasma (NTP) reduction for a marine diesel engine. The proposed technology offers the advantage of not requiring precious-metal catalysts and harmful heavy-metal catalysts as well as urea solution. In this aftertreatment system, PM in the exhaust gas is first captured by a ceramic diesel particulate filter. Subsequently, the deposited PM is oxidized and removed by NTP-induced ozone injection. After the PM treatment, NO x in the exhaust gas is treated by adsorption followed by NTP-combined desorption and reduction processes. These processes are repeated periodically, and total emission control is achieved. Since the deposited PM and the desorbed NO x are treated at a high-concentration state by ozone and oxygen-lean NTP, a higher performance for total marine diesel emission control is recorded. The maximum efficiencies of NO x and PM reduction were 94% and 95%, respectively.Index Terms-Adsorbent, aftertreatment, diesel particulate filters (DPFs), marine diesel engine, marine diesel oil (MDO), nonthermal plasma (NTP), NO x , ozone, particulate matter (PM).

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Section: No X Reduction By Ntp Treatmentmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 85%

mentioning

confidence: 99%

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A Pilot-Scale Experiment for Total Marine Diesel Emission Control Using Ozone Injection and Nonthermal Plasma Reduction

Kuwahara

Yoshida

Hanamoto

et al. 2015

IEEE Trans. on Ind. Applicat.

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“…However, a pilot scale aftertreatment system that was a combination of NTP and adsorption has been designed and successfully met the most recent International Maritime Organization NOx emissions standards by removing 94% of NOx in the exhaust of a marine diesel engine [47,48]. This system operated on adsorption and desorption cycles where plasma was on during desorption cycle only and required ~4% of output engine power.…”

Section: Conclusion and Recommendationsmentioning

confidence: 99%

Non-thermal-plasma-activated de-NO _x catalysis

Gholami

Stere

Goguet

et al. 2017

Phil. Trans. R. Soc. A.

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The combination of non-thermal plasma (NTP) with catalyst systems as an alternative technology to remove NO x emissions in the exhaust of lean-burn stationary and mobile sources is reviewed. Several factors, such as low exhaust gas temperatures (below 300°C), low selectivity to N 2 and the presence of impurities, make current thermally activated technologies inefficient. Various hybrid plasma–catalyst systems have been examined and shown to have a synergistic effect on de-NO x efficiency when compared with NTP or catalyst-alone systems. The NTP is believed to form oxygenated species, such as aldehydes and nitrogen-containing organic species, and to convert NO to NO 2 , which improves the reduction efficiency of N 2 during hydrocarbon-selective catalytic reduction reactions. The NTP has been used as a pretreatment to convert NO to its higher oxidation states such as NO 2 to improve NO x reduction efficiency in the subsequent processes, e.g. NH 3 -selective catalytic reduction. It has been applied to the lean phase of the NO x storage to improve the adsorption capacity of the catalyst by conversion of NO to NO 2 . Alternatively, a catalyst with high adsorption capacity is chosen and the NTP is applied to the rich phase to improve the reduction activity of the catalyst at low temperature. This article is part of a discussion meeting issue ‘Providing sustainable catalytic solutions for a rapidly changing world’.

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“…The nonthermal plasma (NTP) can be used 2 Journal of Chemistry to oxidize NO effectively, and then an absorption process is followed for NO 2 absorption. However, this method requires a high energy consumption [8,9]. Similarly, ozone oxidation method encounters the same limitation [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

NO_xRemoval from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution

Han

Liu

Yang

et al. 2017

Journal of Chemistry

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The experiments were performed in a lab-scale countercurrent spraying reactor to study the NOxremoval from simulated gas stream by cyclic scrubbing using NaClO solution. The effects of NaClO concentration, initial solution pH, coexisting gases (5% CO2and 13% O2), NOxconcentration, SO2concentration, and absorbent temperature on NOxremoval efficiency were investigated in regard to marine exhaust gas. When NaClO concentration was higher than 0.05 M and initial solution pH was below 8, NOxremoval efficiency was relatively stable and it was higher than 60%. The coexisting CO2(5%) had little effect on NOxremoval efficiency, but the outlet CO2concentration decreased slowly with the initial pH increasing from 6 to 8. A complete removal of SO2and NO could be achieved simultaneously at 293 K, initial pH of 6, and NaClO concentration of 0.05 M, while the outlet NO2concentration increased slightly with the increase of inlet SO2concentration. NOxremoval efficiency increased slightly with the increase of absorbent temperature. The relevant reaction mechanisms for the oxidation and absorption of NO with NaClO were also discussed. The results indicated that it was of great potential for NOxremoval from marine exhaust gas by wet scrubbing using NaClO solution.

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Pilot-Scale Aftertreatment Using Nonthermal Plasma Reduction of Adsorbed NOx in Marine Diesel-Engine Exhaust Gas

Cited by 37 publications

References 26 publications

A Pilot-Scale Experiment for Total Marine Diesel Emission Control Using Ozone Injection and Nonthermal Plasma Reduction

A Pilot-Scale Experiment for Total Marine Diesel Emission Control Using Ozone Injection and Nonthermal Plasma Reduction

Non-thermal-plasma-activated de-NO _x catalysis

NO_xRemoval from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution

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Pilot-Scale Aftertreatment Using Nonthermal Plasma Reduction of Adsorbed NOx in Marine Diesel-Engine Exhaust Gas

Cited by 37 publications

References 26 publications

A Pilot-Scale Experiment for Total Marine Diesel Emission Control Using Ozone Injection and Nonthermal Plasma Reduction

A Pilot-Scale Experiment for Total Marine Diesel Emission Control Using Ozone Injection and Nonthermal Plasma Reduction

Non-thermal-plasma-activated de-NO x catalysis

NOxRemoval from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution

Contact Info

Product

Resources

About

Non-thermal-plasma-activated de-NO _x catalysis

NO_xRemoval from Simulated Marine Exhaust Gas by Wet Scrubbing Using NaClO Solution