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Combustion and gasification of chars...

Ma, Liqiang.

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Combustion and gasification of chars in oxygen and carbon dioxide at elevated pressure.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Combustion and gasification of chars in oxygen and carbon dioxide at elevated pressure./
Author:	Ma, Liqiang.
Description:	253 p.
Notes:	Adviser: Reginald E. Mitchell.
Contained By:	Dissertation Abstracts International67-09B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3235275
ISBN:	9780542894930

Combustion and gasification of chars in oxygen and carbon dioxide at elevated pressure.
Ma, Liqiang.

Combustion and gasification of chars in oxygen and carbon dioxide at elevated pressure. - 253 p.

Adviser: Reginald E. Mitchell.

Thesis (Ph.D.)--Stanford University, 2006.

Coal has been an important energy resource for over 100 years and will continue to be in this century. However, traditional schemes for coal utilization have been criticized for low efficiency and high pollution characteristics. Some clean coal technologies have been identified as being viable to address these problems. The fundamental understanding of the physical and chemical processes involved in these advanced coal conversion technologies is necessary. To gain this understanding, extensive experimental and modeling efforts were made to characterize these processes for several carbonaceous materials.

ISBN: 9780542894930Subjects--Topical Terms:

1018531
Engineering, Chemical.

Combustion and gasification of chars in oxygen and carbon dioxide at elevated pressure.
LDR:03128nam 2200313 a 45 001 954146
005 20110621
008 110622s2006 eng d
020 $a 9780542894930
035 $a (UMI)AAI3235275
035 $a AAI3235275
040 $a UMI $c UMI
100 1 $a Ma, Liqiang. $3 1277621
245 1 0 $a Combustion and gasification of chars in oxygen and carbon dioxide at elevated pressure.
300 $a 253 p.
500 $a Adviser: Reginald E. Mitchell.
500 $a Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 5362.
502 $a Thesis (Ph.D.)--Stanford University, 2006.
520 $a Coal has been an important energy resource for over 100 years and will continue to be in this century. However, traditional schemes for coal utilization have been criticized for low efficiency and high pollution characteristics. Some clean coal technologies have been identified as being viable to address these problems. The fundamental understanding of the physical and chemical processes involved in these advanced coal conversion technologies is necessary. To gain this understanding, extensive experimental and modeling efforts were made to characterize these processes for several carbonaceous materials.
520 $a Coal char particles burn with reductions in diameter and apparent density due to the oxygen concentration gradients established inside particles burning at high temperatures. No model based on fundamental principles has been developed that accurately predicates the observed reductions. In this study, a mode of particle burning model was developed that allows for variations in particle size and apparent density during conversion that depend on the instantaneous state of the char particle. It was demonstrated that this model can predict the burning mode of char particles undergoing oxidation in environments similar to those in real furnaces.
520 $a In advanced coal conversion technologies, the char conversion process occurs at elevated pressures. To assure that high-pressure effects are fully characterized in our model, oxidation data were obtained at high pressures and used to validate the model. It was demonstrated that the model accurately describes the dual effects of pressure on chemical kinetics and mass transport rates. The different type structures of char particles that are formed during devolatilization were also characterized. Models for the conversion of cenospherical, mixed and dense char particles were developed and used in a robust model for char oxidation.
520 $a Most advanced coal conversion technologies employ gasification process. In order to provide a framework for developing models of gasifiers, a carbon-carbon dioxide reaction mechanism was developed and validated. With the mechanism, coal conversion in advanced gasifiers can be predicted.
590 $a School code: 0212.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0542
690 $a 0548
710 2 $a Stanford University. $3 754827
773 0 $t Dissertation Abstracts International $g 67-09B.
790 $a 0212
790 1 0 $a Mitchell, Reginald E., $e advisor
791 $a Ph.D.
792 $a 2006
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3235275