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Open AccessArticle

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

1
Department of Mechanical Engineering, Nippon Institute of Technology, 4-1 Gakuendai, Miyashiro-machi, Minamisaitama, Saitama 345-8501, Japan
2
Department of Electrical and Electronic Systems Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
3
Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan
4
Daihatsu Diesel MFG. Co., Ltd., 45 Amura-cho, Moriyama city, Shiga 524-0035, Japan
*
Author to whom correspondence should be addressed.
Energies 2019, 12(19), 3800; https://doi.org/10.3390/en12193800
Received: 4 September 2019 / Revised: 1 October 2019 / Accepted: 4 October 2019 / Published: 8 October 2019
(This article belongs to the Special Issue Plasma Processes for Renewable Energy Technologies)
An efficient NOx reduction aftertreatment technology for a marine diesel engine that combines nonthermal plasma (NTP) and NOx adsorption/desorption is investigated. The aftertreatment technology can also treat particulate matter using a diesel particulate filter and regenerate it via NTP-induced ozone. In this study, the NOx reduction energy efficiency is investigated. The investigated marine diesel engine generates 1 MW of output power at 100% engine load. NOx reduction is performed by repeating adsorption/desorption processes with NOx adsorbents and NOx reduction using NTP. Considering practical use, experiments are performed for a larger number of cycles compared with our previous study; the amount of adsorbent used is 80 kg. The relationship between the mass of desorbed NOx and the energy efficiency of NOx reduction via NTP is established. This aftertreatment has a high reduction efficiency of 71% via NTP and a high energy efficiency of 115 g(NO2)/kWh for a discharge power of 12.0 kW. View Full-Text
Keywords: aftertreatment; energy efficiency; marine diesel engine; nonthermal plasma; NOx aftertreatment; energy efficiency; marine diesel engine; nonthermal plasma; NOx
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MDPI and ACS Style

Kuwahara, T.; Yoshida, K.; Kuroki, T.; Hanamoto, K.; Sato, K.; Okubo, M. High Reduction Efficiencies of Adsorbed NOx in Pilot-Scale Aftertreatment Using Nonthermal Plasma in Marine Diesel-Engine Exhaust Gas. Energies 2019, 12, 3800.

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