Production of liquid and gaseous fuels from steam desulfurization of coal
Darling, Douglas Dean
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https://hdl.handle.net/2142/21769
Description
Title
Production of liquid and gaseous fuels from steam desulfurization of coal
Author(s)
Darling, Douglas Dean
Issue Date
1989
Doctoral Committee Chair(s)
Soo, Shaolee
Department of Study
Mechanical Science and Engineering
Discipline
Mechanical Science and Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Chemical
Engineering, Mechanical
Language
eng
Abstract
The marketability of Illinois coal is severely limited by its high sulfur content. Burning high sulfur coal produces corrosion and pollution problems. Illinois No.6 coal, in particular, contains a high percentage of organic sulfur. Organic sulfur cannot be removed by physical means.
Steam was shown to be effective in removing much of the sulfur from coal. Steam was an effective means to distribute the necessary heat throughout the bed of coal. In addition, steam can be easily separated from the gaseous product by condensation.
The experimental study was performed on a bench scale, fixed bed, batch reactor. The particle size of the original coal was typically 2 mm and the original sample weight was 0.34 kg. Illinois No.6 coal was pretreated with steam and air between 290$\sp\circ$C and 410$\sp\circ$C, for 5 to 15 minutes to prevent caking of the solid during the subsequent steam treatment. The steam treatment took place at temperatures through 650$\sp\circ$C and lasted from 30 to 50 minutes. The sulfur removal characteristics of this process were studied. In addition, this study examined the potential of this process to produce useful liquid and gaseous fuels. The effects of the oxidative pretreatment, on the sulfur removal and production of liquid and gaseous fuels, were also examined.
Finally, the heat and mass transfer phenomena were examined to determine the factors which control the overall rate of the process. This is important if the results obtained from the bench scale, batch reactor are to be used to predict the performance of a potential, industrial scale reactor.
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