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Modeling Char Surface Area Evolution during Coal Pyrolysis: Evolving Characteristics with Coal Rank
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  • He Yang,
  • Yahui Yang,
  • Sarma Pisupati,
  • Lijun Jin,
  • Yang Li,
  • Haoquan Hu
He Yang
Dalian University of Technology
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Yahui Yang
Dalian University of Technology School of Chemical Engineering
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Sarma Pisupati
Pennsylvania State University
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Lijun Jin
Dalian University of Technology
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Yang Li
Dalian University of Technology
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Haoquan Hu
Dalian University of Technology
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Abstract

Crosslinked metaplast influences char N2 adsorption specific surface area (SN2), and the influence changes with coal rank significantly. When crosslinked metaplast is adequate, planar polycyclic aromatic structures overlap tightly and SN2 is small. When crosslinked metaplast content is small, SN2 in crosslinked metaplast is larger than that in the coal matrix and takes a considerable proportion of total char surface area. Two exponents, kmat order and kcrlmet order, representing order degrees of planar polycyclic aromatic structure arrangement in coal matrix and crosslinked metaplast, respectively, were introduced in the previous model for calculating the change of char surface area during coal pyrolysis. The previous model was extended to include predicting SN2 of subbituminous and high-volatile bituminous coals, and was validated with 5 subbituminous coals, and 2 bituminous coals. The change of SN2 with coal ranks and the transition characteristics between coal ranks can be predicted.

Peer review status:Published

Jun 2021Published in Journal of Analytical and Applied Pyrolysis volume 156 on pages 105110. 10.1016/j.jaap.2021.105110