TY - GEN
T1 - Characteristic analyses of gasification and combustion of different coal samples in CO 2-enriched and recycled flue gases atmosphere by rapid heating
T2 - Carbon Management Technology Conference 2012
AU - Li, Z.
AU - Zhang, X.
AU - Saski, K.
AU - Sugai, Y.
AU - Wang, J.
PY - 2012
Y1 - 2012
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:84860999050
SN - 9781618396112
T3 - Society of Petroleum Engineers - Carbon Management Technology Conference 2012
SP - 504
EP - 511
BT - Society of Petroleum Engineers - Carbon Management Technology Conference 2012
Y2 - 7 February 2012 through 9 February 2012
ER -