Pyrolysis of a Victorian brown coal and gasification of nascent char in CO2 atmosphere in a wire-mesh reactor

Kawser Jamil, Hayashi Jun-Ichiro, Chun Zhu Li

Research output: Contribution to journalArticle

149 Citations (Scopus)

Abstract

Temperature-programmed pyrolysis of a Victorian brown coal was performed under flow of atmospheric He or CO2 in a wire-mesh reactor, in which extent of the secondary reactions of volatiles was minimised. Over the ranges of heating rate, holding temperature and holding time of 0.5-1000 °C s -1, 500-900 °C, and 0-120 s, respectively, changing the atmosphere from He to CO2 influenced neither the yield nor composition of tar. Even under heating at 1000 °C s-1, the tar evolution was completed before temperature reached 600 °C. Below this temperature, CO2 behaved as an inert gas in the pore systems of pyrolysing particles. After completion of the tar evolution (above 600 °C), CO2 participated in the formation of light gases from the nascent char. Initial CO2 gasification of the nascent char occurred at a considerably high rate simultaneously with its thermal cracking. The char yield decreased by 11wt%-daf in the course of heating the char in CO2 from 700 to 900 °C at 1000 °C s-1. It was estimated that about a half of the decrease was caused by the CO2 gasification at an average rate over 20wt%-daf-coals-1. Rate of such rapid CO 2 gasification seemed to strongly depend on the rate of thermal cracking, i.e. concentration of radicals formed by the thermal cracking. This hypothesis was consistent with the observed heating rate effects on the rates of the thermal cracking and CO2 gasification of the char.

Original languageEnglish
Pages (from-to)833-843
Number of pages11
JournalFuel
Volume83
Issue number7-8
DOIs
Publication statusPublished - May 1 2004

Fingerprint

Coal
Lignite
Tars
Gasification
Tar
Pyrolysis
Wire
Heating rate
Noble Gases
Heating
Temperature
Carbon Monoxide
Inert gases
Gases
Hot Temperature
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

Cite this

Pyrolysis of a Victorian brown coal and gasification of nascent char in CO2 atmosphere in a wire-mesh reactor. / Jamil, Kawser; Jun-Ichiro, Hayashi; Li, Chun Zhu.

In: Fuel, Vol. 83, No. 7-8, 01.05.2004, p. 833-843.

Research output: Contribution to journalArticle

@article{db2b0672dd89410399a643c8e633dc32,
title = "Pyrolysis of a Victorian brown coal and gasification of nascent char in CO2 atmosphere in a wire-mesh reactor",
abstract = "Temperature-programmed pyrolysis of a Victorian brown coal was performed under flow of atmospheric He or CO2 in a wire-mesh reactor, in which extent of the secondary reactions of volatiles was minimised. Over the ranges of heating rate, holding temperature and holding time of 0.5-1000 °C s -1, 500-900 °C, and 0-120 s, respectively, changing the atmosphere from He to CO2 influenced neither the yield nor composition of tar. Even under heating at 1000 °C s-1, the tar evolution was completed before temperature reached 600 °C. Below this temperature, CO2 behaved as an inert gas in the pore systems of pyrolysing particles. After completion of the tar evolution (above 600 °C), CO2 participated in the formation of light gases from the nascent char. Initial CO2 gasification of the nascent char occurred at a considerably high rate simultaneously with its thermal cracking. The char yield decreased by 11wt{\%}-daf in the course of heating the char in CO2 from 700 to 900 °C at 1000 °C s-1. It was estimated that about a half of the decrease was caused by the CO2 gasification at an average rate over 20wt{\%}-daf-coals-1. Rate of such rapid CO 2 gasification seemed to strongly depend on the rate of thermal cracking, i.e. concentration of radicals formed by the thermal cracking. This hypothesis was consistent with the observed heating rate effects on the rates of the thermal cracking and CO2 gasification of the char.",
author = "Kawser Jamil and Hayashi Jun-Ichiro and Li, {Chun Zhu}",
year = "2004",
month = "5",
day = "1",
doi = "10.1016/j.fuel.2003.09.017",
language = "English",
volume = "83",
pages = "833--843",
journal = "Fuel",
issn = "0016-2361",
publisher = "Elsevier BV",
number = "7-8",

}

TY - JOUR

T1 - Pyrolysis of a Victorian brown coal and gasification of nascent char in CO2 atmosphere in a wire-mesh reactor

AU - Jamil, Kawser

AU - Jun-Ichiro, Hayashi

AU - Li, Chun Zhu

PY - 2004/5/1

Y1 - 2004/5/1

N2 - Temperature-programmed pyrolysis of a Victorian brown coal was performed under flow of atmospheric He or CO2 in a wire-mesh reactor, in which extent of the secondary reactions of volatiles was minimised. Over the ranges of heating rate, holding temperature and holding time of 0.5-1000 °C s -1, 500-900 °C, and 0-120 s, respectively, changing the atmosphere from He to CO2 influenced neither the yield nor composition of tar. Even under heating at 1000 °C s-1, the tar evolution was completed before temperature reached 600 °C. Below this temperature, CO2 behaved as an inert gas in the pore systems of pyrolysing particles. After completion of the tar evolution (above 600 °C), CO2 participated in the formation of light gases from the nascent char. Initial CO2 gasification of the nascent char occurred at a considerably high rate simultaneously with its thermal cracking. The char yield decreased by 11wt%-daf in the course of heating the char in CO2 from 700 to 900 °C at 1000 °C s-1. It was estimated that about a half of the decrease was caused by the CO2 gasification at an average rate over 20wt%-daf-coals-1. Rate of such rapid CO 2 gasification seemed to strongly depend on the rate of thermal cracking, i.e. concentration of radicals formed by the thermal cracking. This hypothesis was consistent with the observed heating rate effects on the rates of the thermal cracking and CO2 gasification of the char.

AB - Temperature-programmed pyrolysis of a Victorian brown coal was performed under flow of atmospheric He or CO2 in a wire-mesh reactor, in which extent of the secondary reactions of volatiles was minimised. Over the ranges of heating rate, holding temperature and holding time of 0.5-1000 °C s -1, 500-900 °C, and 0-120 s, respectively, changing the atmosphere from He to CO2 influenced neither the yield nor composition of tar. Even under heating at 1000 °C s-1, the tar evolution was completed before temperature reached 600 °C. Below this temperature, CO2 behaved as an inert gas in the pore systems of pyrolysing particles. After completion of the tar evolution (above 600 °C), CO2 participated in the formation of light gases from the nascent char. Initial CO2 gasification of the nascent char occurred at a considerably high rate simultaneously with its thermal cracking. The char yield decreased by 11wt%-daf in the course of heating the char in CO2 from 700 to 900 °C at 1000 °C s-1. It was estimated that about a half of the decrease was caused by the CO2 gasification at an average rate over 20wt%-daf-coals-1. Rate of such rapid CO 2 gasification seemed to strongly depend on the rate of thermal cracking, i.e. concentration of radicals formed by the thermal cracking. This hypothesis was consistent with the observed heating rate effects on the rates of the thermal cracking and CO2 gasification of the char.

UR - http://www.scopus.com/inward/record.url?scp=1342323404&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=1342323404&partnerID=8YFLogxK

U2 - 10.1016/j.fuel.2003.09.017

DO - 10.1016/j.fuel.2003.09.017

M3 - Article

AN - SCOPUS:1342323404

VL - 83

SP - 833

EP - 843

JO - Fuel

JF - Fuel

SN - 0016-2361

IS - 7-8

ER -