A Theoretical Study of the Mechanism of Intraparticle Mass Transport of Volatiles During Pyrolysis of Nonsoftening Coal. Application to Secondary Tar Reactions

Gilot P. and Stanmore B.R. (1995) A Theoretical Study of the Mechanism of Intraparticle Mass Transport of Volatiles During Pyrolysis of Nonsoftening Coal. Application to Secondary Tar Reactions. Energy and Fuels, 9 1: 126-135. doi:10.1021/ef00049a019


Author Gilot P.
Stanmore B.R.
Title A Theoretical Study of the Mechanism of Intraparticle Mass Transport of Volatiles During Pyrolysis of Nonsoftening Coal. Application to Secondary Tar Reactions
Journal name Energy and Fuels   Check publisher's open access policy
ISSN 1520-5029
Publication date 1995-05-01
Sub-type Article (original research)
DOI 10.1021/ef00049a019
Open Access Status Not yet assessed
Volume 9
Issue 1
Start page 126
End page 135
Total pages 10
Language eng
Subject 1500 Chemical Engineering
2103 Fuel Technology
2102 Energy Engineering and Power Technology
Abstract The nature of the mass-transfer processes of volatile components released inside pulverized coal particles during pyrolysis is examined by means of a mathematical model. The particles are assumed to be spherical and nonswelling and to have no internal temperature gradients during heating. The thermal cracking of tars is incorporated. Devolatilization kinetics measured for two American lignites are used to give generation rates and the model output is compared to experimental results for these coals. The transfer processes modeled include pressure-driven Poiseuille (bulk) flow and Fickian diffusion, as Knudsen diffusion does not apply. The internal overpressures generated are not great so that external pressure strongly influences the transport mode. Both bulk flow and diffusion are found to be active and are of the same order of magnitude at 10 atm. Above 1 atm external pressure, the ratio of mass transfer by bulk flow to diffusion increases. Thermal cracking is significant only above 1 atm and 750 °C.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import - Archived
 
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Created: Tue, 30 May 2017, 00:04:29 EST by System User