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|Title: ||Strength of metallurgical coke in relation to fissure formation|
|Authors: ||Sato, Hiroshi|
|Keywords: ||Carbon matrix|
|Issue Date: ||1999|
|Publisher: ||© Hiroshi Sato|
|Abstract: ||The size distribution and strength of metallurgical coke are factors vital for the steady and
high-efficiency operation of a blast furnace, since these factors govern stack penneability.
Coke strength influences the size of lump coke not only because of size degradation by
impact and abrasion during transfer to and descent in the blast furnace, but also because
of its influence on the fracture which takes place in the coke layer during carbonisation
and the effect this has on the initial mean size and size distribution of the feed coke.
Therefore, the elucidation of the relationship between coke strength and the fissure
fonnation phenomena is significant.
In this study, therefore, the coke strength development during carbonisation has been
examined in conjunction with various parameters, such as the degree of carbonisation of
the coal, namely the extent or fraction of pyrolytic reaction, and the degree of
graphitisation of the coke, as well as carbonisation temperature and heating regime. The
porous structure of coke has also been examined with a view to establishing a relation
between the porous structure and the coking properties of the coal carbonised. The
quality of coke porous structure was evaluated by parameters introduced in this study,
i.e., the pore size distribution and pore rugosity factors. A poor porous structure is shown
to be associated with high proportion of small pores and pores with a rough surface.
These features are considered to stem from poor coking properties and the consequent
poor adhesion between coal particles.
An attempt has also been made to establish a mathematical model capable of predicting
the degree of fissuring of coke during carbonisation by utilising the understandings
obtained in this study of the coke strength development during carbonisation and the
effect of coal properties on coke strength. Coke samples large enough to facilitate the
observation of the degree of fissuring in relation to various coal properties and heating
conditions, were made to evaluate the mathematical model and introduce the concept.
The concept that fissuring takes place when developing thennal stress exceeds the
developing coke strength is demonstrated to be capable to evaluate the effects of coal
properties and heating conditions on the degree of fissuring observed.|
|Description: ||A Doctoral Thesis. Submitted in partial fulfillment of the requirements for the award of Doctor of Philosophy of Loughborough University.|
|Appears in Collections:||PhD Theses (Chemical Engineering)|
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