Thesis-1988-Walker.pdf (6.33 MB)
The carbon texture of metallurgical coke and its bearing on coke quality prediction
thesis
posted on 2012-11-19, 13:36 authored by Alan WalkerThe carbon in metallurgical coke is composed of textural units, varying
in size and shape depending on the rank of coal carbonized. These induce
a characteristic texture to coke surfaces. This thesis describes a study
of the bearing of this texture on coke strength, particular emphasis
being placed on investigating the feasibility of using textural
composition data, determined by either scanning electron microscopy (SEX)
of etched surfaces or polarized-light microscopy (PLX) of polished coke
surfaces, as a basis of predicting the tensile strength of cokes produced
from blended-coal charges from the behaviour of individual blend
components. Scanning electron microscopy (SEM) of fractured coke surfaces revealed
differences in the mode of fracture of textural components which implied
variations in their contribution to coke strength. The tensile strengths
of pilot-oven cokes, produced from blended-coal charges, could be related
to their measured PLM textural compositions using equations derived from
consideration of simple models of intergranular and transgranular
fracture. The coke strengths could also be related, with greater precision, with
textural data calculated from the coal blend composition and either the
SEM or the PLM textural data for the cokes from the individual blend
components. It was further found that the strength of blended-coal cokes
were additively related to the blend composition and the tensile
strengths of the single-coal cokes. Such relationships are useful, at the
very least, for predicting the strength of cokes from other blends of the
same coals carbonized under similar conditions. The various approaches to
coke strength prediction have potential value in different situations.
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Publisher
© Alan WalkerPublication date
1988Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy of Loughborough University.EThOS Persistent ID
uk.bl.ethos.382031Language
- en