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Pilot verification of a low-tar two-stage coal gasification process with a fluidized bed pyrolyzer and fixed bed gasifier

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  • Zeng, Xi
  • Wang, Fang
  • Li, Hongling
  • Wang, Yin
  • Dong, Li
  • Yu, Jian
  • Xu, Guangwen

Abstract

A 50kg/h autothermal two-stage gasifier, consisting of a fluidized bed (FB) pyrolyzer and a downdraft fixed-bed gasifier, has been designed and built according to our previous laboratory researches. In the experiments, lignite gasification was performed in this innovative two-stage gasifier to demonstrate the process feasibility for clean fuel gas production. The results showed that when keeping the reaction temperatures of the FB pyrolyzer and downdraft fixed bed gasifier respectively at about 860°C and 1100°C, the tar content in the produced fuel gas from the two-stage gasifier was effectively lowered to 84mg/Nm3 and the heating value of fuel gas was close to 4.186MJ/Nm3. Compared with the tar produced in the FB pyrolyzer, the tar from the downdraft fixed bed gasifier had obviously higher content of light oil components and lower content of heavy components, showing essentially an effective catalytic reforming of tar components by the hot char bed of the downdraft fixed bed gasifier.

Suggested Citation

  • Zeng, Xi & Wang, Fang & Li, Hongling & Wang, Yin & Dong, Li & Yu, Jian & Xu, Guangwen, 2014. "Pilot verification of a low-tar two-stage coal gasification process with a fluidized bed pyrolyzer and fixed bed gasifier," Applied Energy, Elsevier, vol. 115(C), pages 9-16.
    • Handle: RePEc:eee:appene:v:115:y:2014:i:c:p:9-16
    DOI: 10.1016/j.apenergy.2013.10.052
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    11. Chen, Zhaohui & Li, Yunjia & Lai, Dengguo & Geng, Sulong & Zhou, Qi & Gao, Shiqiu & Xu, Guangwen, 2018. "Coupling coal pyrolysis with char gasification in a multi-stage fluidized bed to co-produce high-quality tar and syngas," Applied Energy, Elsevier, vol. 215(C), pages 348-355.
    12. Yuan, XiangZhou & Fan, ShuMin & Choi, Seung Wan & Kim, Hyung-Taek & Lee, Ki Bong, 2017. "Potassium catalyst recovery process and performance evaluation of the recovered catalyst in the K2CO3-catalyzed steam gasification system," Applied Energy, Elsevier, vol. 195(C), pages 850-860.
    13. Silva, Isabelly P. & Lima, Rafael M.A. & Santana, Hortência E.P. & Silva, Gabriel F. & Ruzene, Denise S. & Silva, Daniel P., 2022. "Development of a semi-empirical model for woody biomass gasification based on stoichiometric thermodynamic equilibrium model," Energy, Elsevier, vol. 241(C).
    14. Fang, Neng & Li, Zhengqi & Xie, Cheng & Liu, Shuxuan & Lu, Yue & Zeng, Lingyan & Chen, Zhichao, 2021. "Influence of the multi-burner bias angle on the air/particle flow characteristics in an improved fly ash entrained-flow gasifier," Energy, Elsevier, vol. 234(C).
    15. Fang, Neng & Li, Zhengqi & Xie, Cheng & Liu, Shuxuan & Zeng, Lingyan & Chen, Zhichao & Zhang, Bin, 2020. "The application of fly ash gasification for purifying the raw syngas in an industrial-scale entrained flow gasifier," Energy, Elsevier, vol. 195(C).
    16. Wiinikka, Henrik & Wennebro, Jonas & Gullberg, Marcus & Pettersson, Esbjörn & Weiland, Fredrik, 2017. "Pure oxygen fixed-bed gasification of wood under high temperature (>1000°C) freeboard conditions," Applied Energy, Elsevier, vol. 191(C), pages 153-162.
    17. Choi, Young-Kon & Mun, Tae-Young & Cho, Min-Hwan & Kim, Joo-Sik, 2016. "Gasification of dried sewage sludge in a newly developed three-stage gasifier: Effect of each reactor temperature on the producer gas composition and impurity removal," Energy, Elsevier, vol. 114(C), pages 121-128.
    18. Elsner, Witold & Wysocki, Marian & Niegodajew, Paweł & Borecki, Roman, 2017. "Experimental and economic study of small-scale CHP installation equipped with downdraft gasifier and internal combustion engine," Applied Energy, Elsevier, vol. 202(C), pages 213-227.

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