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Air co-gasification of coal and dried sewage sludge in a two-stage gasifier: Effect of blending ratio on the producer gas composition and tar removal

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  • Jeong, Yong-Seong
  • Choi, Young-Kon
  • Park, Ki-Bum
  • Kim, Joo-Sik

Abstract

The co-gasification of coal and dried sewage sludge (DSS) was conducted using a two-stage gasifier consisting of a fluidized bed gasifier and a tar-cracking reactor. In this study, the effect of the blending ratio of coal and DSS was investigated. Producer gases that were obtained from the tar-cracking reactor filled with active carbon contained high levels of hydrogen (maximum H2: 27.7 vol%) and low tar contents (minimum tar: 0 mg/Nm3). Upon gasification of the coal/DSS blends, the hydrogen content decreased and tar content increased with increasing DSS. Blends with coal/DSS ratios of 70/30 and 50/50 showed a synergetic effect on tar reduction, which could be attributed to the high ash content of the DSS. The gasification of the 70% DSS blend increased the condensed tar yield by only 0.1 wt%, compared to coal gasification. Lastly, a hot filter filled with Fe-impregnated active carbon was applied to completely remove tar from producer gas, which led to the production of a tar-free and hydrogen-rich gas (30 vol%). Furthermore, the Fe-impregnated active carbon reduced the H2S content to 229 ppmv. In summary, it was possible to produce a clean gas from coal and DSS blends in the UOS gasification process.

Suggested Citation

  • Jeong, Yong-Seong & Choi, Young-Kon & Park, Ki-Bum & Kim, Joo-Sik, 2019. "Air co-gasification of coal and dried sewage sludge in a two-stage gasifier: Effect of blending ratio on the producer gas composition and tar removal," Energy, Elsevier, vol. 185(C), pages 708-716.
    • Handle: RePEc:eee:energy:v:185:y:2019:i:c:p:708-716
    DOI: 10.1016/j.energy.2019.07.093
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    References listed on IDEAS

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    5. Guangyu Li & Luping Wang & Chaowei Wang & Chang’an Wang & Ping Wu & Defu Che, 2020. "Experimental Study on Coal Gasification in a Full-Scale Two-Stage Entrained-Flow Gasifier," Energies, MDPI, vol. 13(18), pages 1-15, September.
    6. 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).
    7. Sajid, Muhammad & Raheem, Abdul & Ullah, Naeem & Asim, Muhammad & Ur Rehman, Muhammad Saif & Ali, Nisar, 2022. "Gasification of municipal solid waste: Progress, challenges, and prospects," Renewable and Sustainable Energy Reviews, Elsevier, vol. 168(C).
    8. Santa Margarida Santos & Ana Carolina Assis & Leandro Gomes & Catarina Nobre & Paulo Brito, 2022. "Waste Gasification Technologies: A Brief Overview," Waste, MDPI, vol. 1(1), pages 1-26, December.
    9. Jeong, Yong-Seong & Kim, Jong-Woo & Seo, Myung-Won & Mun, Tae-Young & Kim, Joo-Sik, 2021. "Characteristics of two-stage air gasification of polystyrene with active carbon as a tar removal agent," Energy, Elsevier, vol. 219(C).
    10. Janajreh, Isam & Adeyemi, Idowu & Raza, Syed Shabbar & Ghenai, Chaouki, 2021. "A review of recent developments and future prospects in gasification systems and their modeling," Renewable and Sustainable Energy Reviews, Elsevier, vol. 138(C).
    11. Simona Di Fraia & M. Rakib Uddin, 2022. "Energy Recovery from Waste Paper and Deinking Sludge to Support the Demand of the Paper Industry: A Numerical Analysis," Sustainability, MDPI, vol. 14(8), pages 1-18, April.
    12. Quintero-Coronel, Daniel A. & Salazar, Adalberto & Pupo-Roncallo, Oscar R. & Bula, Antonio & Corredor, Lesme & Amador, German & Gonzalez-Quiroga, Arturo, 2023. "Assessment of the interchangeability of coal-biomass syngas with natural gas for atmospheric burners and high-pressure combustion applications," Energy, Elsevier, vol. 276(C).
    13. Alberto Carotenuto & Simona Di Fraia & Nicola Massarotti & Szymon Sobek & M. Rakib Uddin & Laura Vanoli & Sebastian Werle, 2023. "Sewage Sludge Gasification Process Optimization for Combined Heat and Power Generation," Energies, MDPI, vol. 16(12), pages 1-22, June.
    14. Carotenuto, Alberto & Di Fraia, Simona & Massarotti, Nicola & Sobek, Szymon & Uddin, M. Rakib & Vanoli, Laura & Werle, Sebastian, 2023. "Predictive modeling for energy recovery from sewage sludge gasification," Energy, Elsevier, vol. 263(PB).

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