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Characterization of coal char gasification rate
Author(s) -
Adschiri Tadafumi,
Nozaki Takao,
Furusawa Takehiko,
Zibin Zhu
Publication year - 1991
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.690370612
Subject(s) - char , coal , graphite , carbon fibers , chemistry , crystallite , carbon dioxide , partial pressure , chemical engineering , analytical chemistry (journal) , materials science , organic chemistry , crystallography , oxygen , composite material , composite number , engineering
The transient kinetic technique was applied to the evaluation of both elemental rate constants, k av and k in , and the amount of reactive carbons, n w , which participate in gasification. The dynamic change in gasification rate with increasing conversion is due to the change in n w . Differences in the gasification rates of ten different chars can be explained mostly by the differences in n w , rather than by those of k av or k in . n w increased and approached a maximum value, N, with increasing partial pressure of carbon dioxide. The maximum value, N, related closely to the carbon structure of char, especially to the crystallite size of graphite.