Changes in char structure during the low-temperature pyrolysis in N2 and subsequent gasification in air of Loy Yang brown coal char

Changes in char structure during the low-temperature pyrolysis in N2 and subsequent gasification... •This study traces the char structural changes in N2/air at low temperature.•The loss of O-containing species led to reduced intensity from large rings in N2.•The less gasified char obtained at 850 °C was more accessible to oxygen at 420 °C.•The original char structure determines the reaction pathway for small/large rings. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Fuel Elsevier

Changes in char structure during the low-temperature pyrolysis in N2 and subsequent gasification in air of Loy Yang brown coal char

Changes in char structure during the low-temperature pyrolysis in N2 and subsequent gasification in air of Loy Yang brown coal char

Fuel 212 (2018) 187–192 Contents lists available at ScienceDirect Fuel journal homepage: www.elsevier.com/locate/fuel Full Length Article Changes in char structure during the low-temperature pyrolysis in N and subsequent gasification in air of Loy Yang brown coal char a a a a,b a a,c Tingting Li , Lei Zhang , Li Dong , Penghua Qiu , Shuai Wang , Shengjuan Jiang , a, Chun-Zhu Li Fuels and Energy Technology Institute, Curtin University of Technology, GPO Box U1987, Perth, WA 6845, Australia School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, PR China ARTICLE I NFO ABSTRACT Keywords: This study aims to investigate the changes in char structure during the pyrolysis in N and subsequent gasifi- Pyrolysis cation in air at low temperature in a thermogravimetric analyser. The chars produced from the gasification of Gasification Loy Yang brown coal in 15% H O balanced with CO at 850 °C in a fluidised-bed/fixed-bed reactor were used in 2 2 Char structure this work. The evolution of char structure during pyrolysis and in-situ gasification was characterised by FT- FT-Raman spectroscopy Raman spectroscopy. The char-O specific reactivity was measured as well. Our results show that, during further Reactivity pyrolysis, the loss of O-containing structures led to the reduced observed Raman intensity from large aromatic Loy Yang brown coal rings and the formation of new cross-linking structures. During the subsequent gasification in air, the newly formed O-containing structures were more readily incorporated into less gasified char (0 min holding at 850 °C), but never reaching the same oxygenation level as those in the chars that had undergone extensive gasification (longer holding at 850 °C). The structural feature of the starting char (obtained at 850 °C) is the main factor determining the reaction...
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Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier Ltd
ISSN
0016-2361
D.O.I.
10.1016/j.fuel.2017.10.026
Publisher site
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Abstract

•This study traces the char structural changes in N2/air at low temperature.•The loss of O-containing species led to reduced intensity from large rings in N2.•The less gasified char obtained at 850 °C was more accessible to oxygen at 420 °C.•The original char structure determines the reaction pathway for small/large rings.

Journal

FuelElsevier

Published: Jan 15, 2018

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