Characteristic analyses of gasification and combustion of different coal samples in CO 2-enriched and recycled flue gases atmosphere by rapid heating: Effects of O 2 concentration and H 2O

Z. Li, X. Zhang, K. Saski, Y. Sugai, J. Wang

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Combustion and gasification of pulverized coal have been investigated experimentally for the conditions under high temperature gradient and CO 2-rich atmospheres with 5% and 10% O 2. Crushed coal samples were heated rapidly by a CO 2 gas laser beam to give a high temperature gradient of order 100°C s -1 in order to simulate radiation heat transfer conditions expected in coal gasification furnaces. The rapid heating is able to minimize effects of coal oxidation and combustion compared with previous studies with a TG-DTA that requires much longer time to heat up with oxidation effect. Moreover, coal-water mixture samples with different water/coal mass ratio were used in order to investigate roles of water vapor on the combustion and gasification. The experimental results indicated that coal weight reduction ratio or coal conversion ratio to gases follows the Arrhenius equation with increasing coal temperature; in addition, coal weight reduction ratio of the sample was increased around 5% with adding H 2O in CO 2-rich atmosphere. Furthermore, generations of CO gas and Hydrocarbons gases (HCs) were mainly dependent on coal temperature and O 2 concentration, however, those are also affected by chemical reactions including H 2O. Especially, reactions generating CO and HCs gases were stimulated at temperature over 1000°C in the CO 2-rich atmosphere with 5% O 2.

Original languageEnglish
Title of host publicationSociety of Petroleum Engineers - Carbon Management Technology Conference 2012
Pages504-511
Number of pages8
Publication statusPublished - May 18 2012
EventCarbon Management Technology Conference 2012 - Orlando, FL, United States
Duration: Feb 7 2012Feb 9 2012

Publication series

NameSociety of Petroleum Engineers - Carbon Management Technology Conference 2012
Volume1

Other

OtherCarbon Management Technology Conference 2012
CountryUnited States
CityOrlando, FL
Period2/7/122/9/12

All Science Journal Classification (ASJC) codes

  • Industrial and Manufacturing Engineering
  • Media Technology
  • Environmental Science(all)

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