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Modeling the influence of changes in aliphatic structure on char surface area during coal pyrolysis
Author(s) -
Yang He,
Fletcher Thomas H.,
Li Yang,
Jin Lijun,
Li Sufen,
Shang Yan,
Hu Haoquan
Publication year - 2020
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.16834
Subject(s) - char , pyrolysis , coal , chemistry , chemical engineering , adsorption , specific surface area , percolation (cognitive psychology) , bituminous coal , organic chemistry , catalysis , neuroscience , engineering , biology
Abstract The influence of changes in aliphatic structure on char surface area during coal pyrolysis was modeled, and the effect was introduced to a previous char surface area model for lignite pyrolysis established based on the chemical percolation devolatilization (CPD) model. The modified model can predict not only the N 2 and CO 2 char surface area during rapid pyrolysis of three lignites but also the CO 2 char surface area of two high‐volatile bituminous coals; the agreement of the modified model with experiments is improved at high temperatures. The decrease in aliphatic chain length can reduce adsorption positions around aromatic core, and decrease char surface area. When mass release is more than 55% at about 1,100 K, the predicted N 2 char surface area starts to decrease with further generation of volatiles, and the increase of predicted CO 2 char surface area with increasing generation of volatiles also become slow at the end of mass release.