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A study on the chemical state of carbon present in fine ash from gasification
Author(s) -
Zhang Yuanchun,
Li Hanxu,
Gao Shengtao,
Geng Yan,
Wu Chengli
Publication year - 2019
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2336
Subject(s) - carbon fibers , materials science , silicon , fly ash , coal , microstructure , chemical engineering , aluminium , coal gasification , chemical composition , layer (electronics) , mineralogy , metallurgy , chemistry , composite material , organic chemistry , composite number , engineering
Taking feed coal as a reference, the chemical states, content changes, microstructure, distribution, and graphitizable extent of carbon present in gasification fine ash were investigated in detail. The results show that the fine ash includes a significant amount of unreacted carbon. The C1s spectrum is composed of four components in which the contents of C–C and C–H decrease dramatically and graphitized carbon (39.1%) presents. The elemental carbon primarily distributes on the layer structure, whereas elemental silicon and aluminum are mainly found on spherical particles embedded in the layer structure. After gasification, carbon atoms in gasification fine ash are arranged in an orderly manner, and the extent of graphitization of carbon increases, which indicates that carbon in feed coal may be partly graphitized and deposited in fine ash during gasification process.