Modeling char surface area evolution during coal pyrolysis: Effect of swelling and gasification at high pressures

He Yang, Sarma V. Pisupati, Haoquan Hu

Research output: Contribution to journalConference articlepeer-review

3 Scopus citations

Abstract

A previous model for char surface area change during atmospheric coal pyrolysis was modified to include the effect of particle swelling and gasification to predict the N2 adsorption specific surface area of high-volatile bituminous char generated at high pressures with or without gasification. A correlation between the change of char surface area and the ratio of the expansion work for particle swelling to the mass of metaplast cross-linked with coal matrix was developed and analyzed. The number of the defect regions generated by gasification was considered in calculating adsorption sites quantitatively. Particle swelling opened and then compressed the space between metaplast clusters, making the N2 adsorption specific surface area of char increased first and then decreased. After the gaps between metaplast clusters were filled, the specific surface area changes were minimal. Gasification generated new defect regions in clusters and reduced the clusters in char, making the specific surface area of char first increased and then decreased.

Original languageEnglish (US)
Pages (from-to)4151-4159
Number of pages9
JournalProceedings of the Combustion Institute
Volume38
Issue number3
DOIs
StatePublished - 2021
Event38th International Symposium on Combustion, 2021 - Adelaide, Australia
Duration: Jan 24 2021Jan 29 2021

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

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