Abstract
Diesel engine is an attractive energy conversion device that emits low CO2 from the viewpoint of the global warming and is widely used for various industries. The problem is that the emission contains air pollutants such as NOx and particulate matter. Regulations governing marine diesel engine NOx emissions have recently become more stringent. As it is difficult to fulfill these requirements by combustion improvements alone, effective aftertreatment technologies are needed to achieve efficient NOx reductions. In this study, we develop an effective NOx reduction aftertreatment system for a marine diesel engine that employs combined nonthermal plasma (NTP) and adsorption. Compared with selective catalytic reduction, the proposed technology offers the advantages of not requiring a urea solution or harmful heavy-metal catalysts and low operating temperatures of less than 150 °C. The NOx reduction comprises repeated adsorption and desorption flow processes using NTP combined with NOx adsorbents made of MnOx–CuO. High concentrations of NOx are treated by NTP after NOx adsorption and desorption, and this aftertreatment system demonstrates excellent energy efficiencies of 161 g(NO2)/kWh, which fulfills the most recent International Maritime Organization emission NOx standards in the Tier II to III regulations for 2016 and requires only 4.3 % of the engine output power.
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Abbreviations
- A :
-
Heat transfer area (m2)
- E :
-
Applied energy (kWh)
- I :
-
Discharge current (A)
- k :
-
Coefficient of overall heat transfer (W/(m2 K))
- Q :
-
Total heat quantity (kW)
- ΔT :
-
Gas temperature differences between paths I and II (K)
- V :
-
Discharge voltage (V)
- W :
-
Mass of NOx based on the molecular weight of NO2 (g(NO2))
- η :
-
NOx removal energy efficiency based on the molecular weight of NO2(g(NO2)/kWh)
- 1:
-
Inlet of the adsorption chamber
- 2:
-
Outlet of the adsorption chamber
- a:
-
Adsorption
- d:
-
Desorption
- ex:
-
Exchange
- m:
-
Logarithmic mean
- NTP:
-
Nonthermal plasma
- system:
-
Aftertreatment system
- CRT:
-
Continuous regeneration trap
- DPF:
-
Diesel particulate filter
- EGR:
-
Exhaust gas recirculation
- EGCR:
-
Exhaust gas components’ recirculation
- IMO:
-
International Maritime Organization
- MDO:
-
Marine diesel oil
- MFO:
-
Marine fuel oil
- NTP:
-
Nonthermal plasma
- PM:
-
Particulate matter
- SCR:
-
Selective catalytic reduction
- CO:
-
Carbon monoxide
- CO2 :
-
Carbon dioxide
- HC:
-
Hydrocarbon
- HNO3 :
-
Nitric acid
- N2 :
-
Nitrogen
- N:
-
Nitrogen radical
- NO:
-
Nitric monoxide
- NO2 :
-
Nitrogen dioxide
- NOx :
-
Nitrogen oxides
- N2O:
-
Nitrous oxide
- N2O5 :
-
Dinitrogen pentoxide
- O2 :
-
Oxygen
- O3 :
-
Ozone
- SiC:
-
Silicon carbide
- SO x :
-
Sulfur oxide
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Acknowledgments
This work was supported by the Regional R&D Resources Utilization Program in the Japan Science and Technology Agency (JST). It is also partly supported by Japan Society for the Promotion of Science (JSPS) KAKENHI Grant Number 24246145 and 249848. The authors would like to thank T. Kuroki, M. Nishimoto, T. Shinohara, M. Kawai, S. Tagawa (Osaka Prefecture University), K. Yoshida (Osaka Institute of Technology), K. Sato, K. Hanamoto, S. Shimomura (Daihatsu Diesel MFG. Co. Ltd.), and S. Hosokawa (Masuda Research Inc.) for their contributions to the experiments.
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Kuwahara, T., Okubo, M. (2017). Super Clean Marine Diesel Engines with Nonthermal Plasma Aftertreatment Technology. In: Zhang, X., Dincer, I. (eds) Energy Solutions to Combat Global Warming. Lecture Notes in Energy, vol 33. Springer, Cham. https://doi.org/10.1007/978-3-319-26950-4_19
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DOI: https://doi.org/10.1007/978-3-319-26950-4_19
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