Physical and computational studies of slag behavior in an entrained flow gasifier

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Title Physical and computational studies of slag behavior in an entrained flow gasifier
Publication Type dissertation
School or College College of Engineering
Department Chemical Engineering
Author Pummill, Randy
Date 2012-08
Description This work details an investigation of how to modify slag flow so as to maintain a clear line of sight across the reaction section of an entrained-flow coal gasifier. Physical and computational models were developed to study methods of diverting the molten slag that flows vertically down the walls of the reactor. The physical models employed silicone oil of varying viscosity. The computational models were developed using the Fluent software package. Based on the insight gained from the results of the models, two devices were created and tested in a pilot scale gasifier located at the University of Utah. The first method of slag diversion studied employed a gas jet to impact the slag film and cause it to flow around a sight port in the gasifier wall. By studying the film and jet interactions, it was discovered that the resulting behavior of such a system can be described by a dimensionless ratio of the kinetic energy of the jet and the surface energy of the film. The development of the dimensionless number, called a Lotte number in this work, is presented in detail. Generally, viscous films will be broken by a jet when the Lotte number is greater than 5 and will reclose when the Lotte number falls below a value of 1.5. The second slag diversion method studied used a round alumina tube protruding horizontally into the reaction section to break up the film. As the film impacts the tube, it progresses horizontally along the length of the tube before resuming the downward flow.
Type Text
Publisher University of Utah
Subject Coal; Entrained flow gasifier; Gasification; Slag
Subject LCSH Slag; Coal gasification plants
Dissertation Institution University of Utah
Dissertation Name Doctor of Philosophy
Language eng
Rights Management Copyright © Randy Pummill 2012
Format application/pdf
Format Medium application/pdf
Format Extent 4,648,528 bytes
Identifier etd3/id/1844
Source Original in Marriott Library Special Collections, TP7.5 2012 .P86
ARK ark:/87278/s6mw2z0d
Setname ir_etd
ID 195532
Reference URL https://collections.lib.utah.edu/ark:/87278/s6mw2z0d
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