Structure evolution of lignite char in step pyrolysis and its combustion reactivity

• Published in: Fuel (Guildford) Vol. 315; p. 123256
• Main Authors: Qi, Jianan, Fan, Chuigang, Wu, Hao, Li, Songgeng
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.05.2022; Elsevier BV
• Subjects: Combustion; Crossing-linking reaction; Crosslinking; Evolution; Fixed bed reactors; Fixed beds; Graphitization; Gravimetric analysis; Lignite; Lignite char; Nitrogen; Photoelectron spectroscopy; Photoelectrons; Pyrolysis; Reactivity; Step pyrolysis; Structure evolution; Sulfur; Thermal analysis; X ray photoelectron spectroscopy; X-ray diffraction; Crossing-linking reaction; Structure evolution; Step pyrolysis; Lignite char

•Step pyrolysis favors char production, attributed to cross-linking reactions.•Step pyrolysis char has lower combustion reactivity relevant to direct pyrolysis.•An index was proposed to assess the extent of cross-linking reactions in pyrolysis.•Step pyrolysis inhibits N and S releases by forming mor...