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Performance Analysis of a Waste Heat Recovery System for a Biogas Engine Using Waste Resources in an Industrial Complex

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  • Kyung-Chul Cho

    (School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea
    Energy System Research Center, Korea Textile Machinery Convergence Research Institute, Gyeongsan 38542, Republic of Korea)

  • Ki-Yeol Shin

    (School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea)

  • Jaesool Shim

    (School of Mechanical Engineering, Yeungnam University, Gyeongsan 38541, Republic of Korea)

  • San-Su Bae

    (Daekyung Energy Engineering Co., Ltd., Seoul 08591, Republic of Korea)

  • Oh-Dae Kwon

    (Four-One System Co., Ltd., Gyeongsan 38539, Republic of Korea)

Abstract

To achieve carbon neutrality and address global energy supply issues by 2050, there is active progress in the industrial sector for waste energy recovery and commercialization projects. It is necessary to consider both the energy recovery efficiency and economic feasibility based on the production volume for the resource utilization of waste energy, along with eco-friendly processing methods. In this study, a waste heat recovery system was designed to recover a large amount of thermal energy from high-temperature exhaust gases of gas engines for power generation by using biogas produced from organic waste in industrial complexes. Types and sizes of components for a waste heat recovery system that were suitable for various engine sizes depending on biogas production were designed, and the energy recovery efficiency was analyzed. The waste heat recovery system consisted of a smoke tube boiler that generated superheated steam at 161 °C under 490 kPa of pressure from the exhaust gas as the heat source, along with two economizers for heating both supply water and hot water. Heat exchangers that were suitable for three different engine sizes were configured, and their performance and energy flow were calculated. In particular, when operating two engines with a power output of 100 kW, the boiler showed the highest steam production efficiency, and the superheated steam production from high-temperature exhaust gas at 600 °C was designed to be 191 kg/h, while hot water at 58 °C was designed to be produced at 1000 kg/h. In addition, further research on the heat exchanger capacity ratio confirmed that it was within a certain range despite the difference in heat exchanger capacity and efficiency depending on the engine size. It was confirmed that the heat exchange capacity ratio of the boiler was important as an optimal-capacity design value for the entire system, as it ranged from 46% to 47% of the total heat exchanger size.

Suggested Citation

  • Kyung-Chul Cho & Ki-Yeol Shin & Jaesool Shim & San-Su Bae & Oh-Dae Kwon, 2024. "Performance Analysis of a Waste Heat Recovery System for a Biogas Engine Using Waste Resources in an Industrial Complex," Energies, MDPI, vol. 17(3), pages 1-15, February.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:3:p:727-:d:1332397
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    References listed on IDEAS

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    1. Forman, Clemens & Muritala, Ibrahim Kolawole & Pardemann, Robert & Meyer, Bernd, 2016. "Estimating the global waste heat potential," Renewable and Sustainable Energy Reviews, Elsevier, vol. 57(C), pages 1568-1579.
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