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Effect of Pressure on the Swelling of Density Separated Coal Particles by Vladimir Strezov; John A. Lucas; Terry F. Wall is a Engineering article available to read on EtoBox.

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Most of the advanced coal combustion and gasification processes operate under pressurised conditions. Current knowledge of the in situ effect of pressure on coal devolatilisation and swelling, however, is limited, but is essentially required for optimisation of these technologies and to ensure future developments. During heating, fluidity is induced by breaking the coal covalent bonds and forming a plastic state where nucleation occurs, volatiles evolve as bubbles and they flow, diffuse, coalesce and rupture in a complex combination of events that lead to the transient structural evolution of the heated coal particle. The effect of pressure on swelling of individual coal particles is the subject of this work. Density fractions of particles were prepared using a sink-float technique to achieve homogeneous particle properties. Groups of particles from each density fraction were heated in a pressurised single particle reactor at pressures ranging from 0.1 to 5 MPa. The thermal behaviour of each sample was recorded using a long distance microscope attached to a CCD camera. Pressure was found to have parallel and competitive effects on the particle fluidity and transient swelling, resul

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Author

Vladimir Strezov; John A. Lucas; Terry F. Wall

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0016-2361)

Published

2005

Language

EN

Field

Engineering (Physical Sciences)