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Effects of CO Atmosphere on the Pyrolysis of a Typical Lignite
Author(s) -
Wang Qinhui,
Li Kaikun,
Guo Zhihang,
Fang Mengxiang,
Luo Zhongyang
Publication year - 2021
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.202000273
Subject(s) - char , chemistry , pyrolysis , atmosphere (unit) , yield (engineering) , tube furnace , catalysis , coal , tar (computing) , raw material , hydrocarbon , reducing atmosphere , radical , carbon fibers , chemical engineering , organic chemistry , metallurgy , materials science , physics , engineering , composite number , computer science , composite material , thermodynamics , programming language
To reveal the effect mechanism of CO atmosphere on coal pyrolysis, a study on raw and demineralized lignite was carried out in a horizontal tube furnace under N 2 and CO/N 2 atmosphere. CO had a negligible effect on the char yield at low temperatures, whereas it enhances the char yield at temperatures higher than 550 °C. The release of tar was higher in the presence of CO above 450 °C because of more free radicals, which reduced low‐temperature crosslinking, and higher selectivity of hydroxyl groups to phenols in the CO‐containing atmosphere. The yields of CO 2 and H 2 increased, water and CO yields decreased under CO/N 2 atmosphere. Light hydrocarbon gases were not affected by changing the reaction atmosphere. The difference between product yields from raw and demineralized coal confirmed that the catalysis of inherent minerals had a great catalytic effect on the water‐gas shift reaction and Boudouard reaction.