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Comparison of BGL and Lurgi gasification for coal to liquid fuels (CTL): Process modeling, simulation and thermodynamic analysis

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  • Qin, Shiyue
  • Zhang, Xuzhi
  • Wang, Ming
  • Cui, Hongyou
  • Li, Zhihe
  • Yi, Weiming

Abstract

Fixed bed gasifiers are widely used for the production of clean alternative fuels, chemicals and electricity. Of the commercialized fixed bed gasifiers, BGL and Lurgi gasifiers are the most typical. In this paper, modeling, simulation and comparison of the coal to liquid fuels (CTL) process with BGL/Lurgi gasifier are conducted. For a typical CTL process with feeding rate of 852.74 t coal (dry)/h, Case BGL can produce Fischer-Tropsch (FT) liquids of 212.61 t/h, while Case Lurgi can produce 168.48 t/h. Case BGL demonstrates higher energy efficiency (44.91%) than Case Lurgi (41.21%) due to the higher syngas yield of BGL gasifier. The corresponding exergy efficiencies are 44.65% for Case BGL and 40.27% for Case Lurgi, respectively. The exergy losses of the subsystems are quantitatively analyzed and the measures to reduce exergy losses are proposed. The techno-economic and CO2 emission analysis are investigated. Finally, the performances of fixed bed and entrained flow gasifiers for CTL process are compared. It is found that gasification has an important influence on the thermodynamic efficiency, economics, and CO2 emission, and this research is useful for gasifier selection in the CTL process.

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  • Qin, Shiyue & Zhang, Xuzhi & Wang, Ming & Cui, Hongyou & Li, Zhihe & Yi, Weiming, 2021. "Comparison of BGL and Lurgi gasification for coal to liquid fuels (CTL): Process modeling, simulation and thermodynamic analysis," Energy, Elsevier, vol. 229(C).
    • Handle: RePEc:eee:energy:v:229:y:2021:i:c:s0360544221009452
    DOI: 10.1016/j.energy.2021.120697
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