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Characterization and Impact of Waste Plastic Oil in a Variable Compression Ratio Diesel Engine

Author

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  • Khatha Wathakit

    (Institute of Engineering, School of Mechanical Engineering, Suranaree University of Technology, Muang Nakhon Ratchasima District, Nakhon Ratchasima 30000, Thailand)

  • Ekarong Sukjit

    (Institute of Engineering, School of Mechanical Engineering, Suranaree University of Technology, Muang Nakhon Ratchasima District, Nakhon Ratchasima 30000, Thailand)

  • Chalita Kaewbuddee

    (Faculty of Industrial Technology, Surindra Rajabhat University, 186 Moo 1 Surin-Prasat Road, Nokmuang Sub-District, Muang District, Surin 32000, Thailand)

  • Somkiat Maithomklang

    (Institute of Engineering, School of Mechanical Engineering, Suranaree University of Technology, Muang Nakhon Ratchasima District, Nakhon Ratchasima 30000, Thailand)

  • Niti Klinkaew

    (Institute of Engineering, School of Mechanical Engineering, Suranaree University of Technology, Muang Nakhon Ratchasima District, Nakhon Ratchasima 30000, Thailand)

  • Pansa Liplap

    (Institute of Engineering, School of Mechanical Engineering, Suranaree University of Technology, Muang Nakhon Ratchasima District, Nakhon Ratchasima 30000, Thailand)

  • Weerachai Arjharn

    (Institute of Engineering, School of Mechanical Engineering, Suranaree University of Technology, Muang Nakhon Ratchasima District, Nakhon Ratchasima 30000, Thailand)

  • Jiraphon Srisertpol

    (Institute of Engineering, School of Mechanical Engineering, Suranaree University of Technology, Muang Nakhon Ratchasima District, Nakhon Ratchasima 30000, Thailand)

Abstract

The characterization of pyrolysis oil obtained from mixed waste plastics and its utilization in a compression ignition engine were investigated. The chemical compositions and physicochemical properties of distilled waste plastic oil (WPO) and crude waste plastic oil (CWPO) were analyzed. The experiment was conducted with a variable compression ratio diesel engine at various loads and compression ratios to evaluate combustion characteristics, exhaust emissions, and engine performance. The experimental results show that CWPO contains the highest percentage of carbon atoms in the C4–C11 group, while WPO contains the highest percentage of carbon atoms in the C12–C20 group, similar to the main compositions of diesel fuel. According to the preliminary study in chemical compositions and physicochemical properties, WPO and diesel fuel were selected for the engine test at different compression ratios of 16, 17, and 18 and different engine operating loads of 25%, 50%, and 75% of maximum engine torque at an engine speed of 1500 rpm. It was found that increasing the engine operating load and the compression ratio tends to increase the brake thermal efficiency. Increasing the compression ratio results in a significantly shorter delay time in a combustion state. A lower cetane index and a higher percentage of long chain carbon compounds (C12–C20) could be the main factors affecting higher NOx, CO, and HC emissions with the combustion characteristics of WPO, compared to diesel fuel. The disadvantage of emissions by the use of WPO can be alleviated when the engine is running at maximum load and a high compression ratio.

Suggested Citation

  • Khatha Wathakit & Ekarong Sukjit & Chalita Kaewbuddee & Somkiat Maithomklang & Niti Klinkaew & Pansa Liplap & Weerachai Arjharn & Jiraphon Srisertpol, 2021. "Characterization and Impact of Waste Plastic Oil in a Variable Compression Ratio Diesel Engine," Energies, MDPI, vol. 14(8), pages 1-18, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:8:p:2230-:d:537550
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    References listed on IDEAS

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    2. Jena, Priyaranjan & Raj, Reetu & Tirkey, Jeewan Vachan, 2023. "Thermodynamic performance study and RSM based optimization of SI engine using sewage sludge producer gas blend with methane," Energy, Elsevier, vol. 273(C).
    3. Chonlakarn Wongkhorsub & Wantana Chaowasin & Kampanart Theinnoi, 2022. "Experimental Evaluation of Performance and Combustion Characteristics of Blended Plastic Pyrolysis Oil in Enhanced Diesel Engine," Energies, MDPI, vol. 15(23), pages 1-17, December.
    4. Mirkarimi, S.M.R. & Bensaid, S. & Chiaramonti, D., 2022. "Conversion of mixed waste plastic into fuel for diesel engines through pyrolysis process: A review," Applied Energy, Elsevier, vol. 327(C).
    5. Navaneetha Krishnan Balakrishnan & Yew Heng Teoh & Heoy Geok How & Thanh Danh Le & Huu Tho Nguyen, 2023. "An Experimental Investigation on the Characteristics of a Compression Ignition Engine Fuelled by Diesel-Palm Biodiesel–Ethanol/Propanol Based Ternary Blends," Energies, MDPI, vol. 16(2), pages 1-18, January.
    6. Somkiat Maithomklang & Ekarong Sukjit & Jiraphon Srisertpol & Niti Klinkaew & Khatha Wathakit, 2023. "Pyrolysis Oil Derived from Plastic Bottle Caps: Characterization of Combustion and Emissions in a Diesel Engine," Energies, MDPI, vol. 16(5), pages 1-21, March.
    7. Jena, Priyaranjan & Tirkey, Jeewan Vachan, 2024. "Power and efficiency improvement of SI engine fueled with boosted producer gas-methane blends and LIVC-miller cycle strategy: Thermodynamic and optimization studies," Energy, Elsevier, vol. 289(C).

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