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Gasification of western canadian lignite coals
Author(s) -
Heijden S. P. N. Van Der,
Verma Arun
Publication year - 1981
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450590310
Subject(s) - char , coal , methane , carbon fibers , chemistry , carbon dioxide , environmental chemistry , heat of combustion , environmental science , mineralogy , pulp and paper industry , combustion , materials science , organic chemistry , composite number , composite material , engineering
Samples of a typical Estevan lignite coal (empirical formula CH 0.81 O 0.25 N 0.01 S 0.003 ) with a heating value of 16.713 MJ/kg were gasified with air only and air/steam mixtures at near atmospheric and high pressures up to 6 MPa. The carbon content of ash/char residues of the gasification reactions varied from 1.2% for air/steam reactions and was in the 16‐53% range for reactions using air only, For all experiments the end point was clearly indicated by a rapid change in oxygen concentration in the gas samples. Plots of the fractional conversion of carbon as a function of time, showed high initial reaction rates as the volatile matter in coal is gasified. The rates diminish as the carbon is being consumed. The heating values for the gas samples collected during each run showed a large correlation with the methane content of the sample.