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Kawakami K, Watatani K, Yamasaki H, Kuroki T, Okubo M. Performance evaluation of PM, NO x, and hydrocarbon removal in diesel engine exhaust by surface discharge-induced plasma. JOURNAL OF HAZARDOUS MATERIALS 2024; 462:132685. [PMID: 37862904 DOI: 10.1016/j.jhazmat.2023.132685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Revised: 09/23/2023] [Accepted: 09/30/2023] [Indexed: 10/22/2023]
Abstract
Diesel engines are characterized by low CO2 emissions and high fuel efficiency. However, their exhausts contain nitrogen oxides (NOx), particulate matter (PM), and hydrocarbons (HC) that require removal by aftertreatment. A novel low-temperature plasma-based aftertreatment method has been developed for the simultaneous removal of NOx, PM, and HC. NOx could be reduced by reacting with HC and CO in the exhaust gas. The particle and gas concentrations in the exhaust are measured using a scanning mobility particle sizer, a NOx analyzer, and a total hydrocarbon analyzer. The treatment performance is evaluated using the resulting measurements. The diesel engine is operated under 0%, 25%, 50%, and 75% loads (maximum output of 2 kW), and the exhaust gas is mixed with N2 + O2 (13%) gas. The power is adjusted to provide 100, 200, 300, and 400 W input power during the plasma reactor treatment. The aftertreatment removal of NOx, PM, and HC is evaluated, and the engine exhibits a removal efficiency of 70% for NOx, 98% for PM, and 67% for HC at 75% engine load and an input power of 100 W.
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Affiliation(s)
- Kohei Kawakami
- Department of Mechanical Engineering, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan
| | - Ken Watatani
- Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan
| | - Haruhiko Yamasaki
- Department of Mechanical Engineering, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan; Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan
| | - Tomoyuki Kuroki
- Department of Mechanical Engineering, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan; Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan
| | - Masaaki Okubo
- Department of Mechanical Engineering, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan; Department of Mechanical Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Japan.
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Thitipatanapong S, Visuwan P, Komintarachat C, Theinnoi K, Chuepeng S. Insight into Nanoparticle-Number-Derived Characteristics of Precharged Biodiesel Exhaust Gas in Nonthermal Plasma State. ACS OMEGA 2022; 7:5376-5384. [PMID: 35187352 PMCID: PMC8851636 DOI: 10.1021/acsomega.1c06597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Accepted: 01/25/2022] [Indexed: 05/03/2023]
Abstract
The utilization of biodiesel as an alternative partial replacement of diesel fuel was shown to improve exhaust emissions from diesel engines. Waste cooking oil biodiesel (WCO) has also gained more attention due to edible biofuel supply and the environment. In this study, a nonthermal plasma (NTP) technique was applied to be equipped into the after-treatment system of a four-cylinder diesel engine at medium- and high-load conditions. The exhaust gases in the NTP state from the combustion of WCO and diesel (D100) fuels were partially drawn by spectrometers and nanoparticle-number-derived characteristics were analyzed. The particle number, area, and mass concentrations were in log-normal distribution over equivalent diameters, and they were higher at high load. The concentration of the particulate matter (PM) was lower but was larger in size when the NTP charger was activated due to coagulation principally owing to WCO's number and surface area. The total particle masses were lower for WCO at the two load conditions tested. During NTP charger activation, the mass mean diameters were increased by maximum values of 24.0% for D100 and 5.5% for WCO. The PM removal efficiencies were maximized by 10.8% for D100 and 16.7% for WCO when the NTP charger was in use, and the WCO exhaust was dominantly seen to simultaneously reduce NO x and PM emissions.
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Affiliation(s)
- Sarapon Thitipatanapong
- Department
of Mechanical Engineering, Faculty of Engineering, Kasetsart University, 50 Ngamwongwan Road, Bangkok 10900, Thailand
| | - Poranat Visuwan
- Department
of Mechanical Engineering, Faculty of Engineering, Kasetsart University, 50 Ngamwongwan Road, Bangkok 10900, Thailand
- ATAE
Research Unit, Department of Mechanical Engineering, Faculty of Engineering
at Sriracha, Kasetsart University, 199 Sukhumvit Road, Chonburi 20230, Thailand
| | - Cholada Komintarachat
- Department
of Basic Science and Physical Education, Faculty of Science at Sriracha, Kasetsart University, 199 Sukhumvit Road, Chonburi 20230, Thailand
| | - Kampanart Theinnoi
- College
of Industrial Technology, King Mongkut’s
University of Technology North Bangkok, 1518 Pracharat 1 Road, Wongsawang,
Bangsue, Bangkok 10800, Thailand
- Research
Centre for Combustion Technology and Alternative Energy (CTAE), Science
and Technology Research Institute, King
Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand
| | - Sathaporn Chuepeng
- ATAE
Research Unit, Department of Mechanical Engineering, Faculty of Engineering
at Sriracha, Kasetsart University, 199 Sukhumvit Road, Chonburi 20230, Thailand
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