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Use of high-temperature, high-torque rheometry to study the viscoelastic properties of coal during carbonization
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10.1122/1.2754317
/content/sor/journal/jor2/51/5/10.1122/1.2754317
http://aip.metastore.ingenta.com/content/sor/journal/jor2/51/5/10.1122/1.2754317

Figures

Image of FIG. 1.
FIG. 1.

and as a function of strain for coal B (left) and coal D (right) during softening (top), maximum fluidity (middle), and resolidification (bottom).

Image of FIG. 2.
FIG. 2.

Linear viscoelastic properties of coal B during carbonization (, ).

Image of FIG. 3.
FIG. 3.

Phase angle and rate of mass loss for coal B as a function of temperature (, ).

Image of FIG. 4.
FIG. 4.

Complex viscosity for coals A, B, C, and D as a function of temperature (, ).

Image of FIG. 5.
FIG. 5.

Frequency sweep tests for coals B (top) and D (bottom) at different temperatures.

Image of FIG. 6.
FIG. 6.

Shear rate sweep tests for coal B at C and coal D at C.

Image of FIG. 7.
FIG. 7.

Apparent viscosity as a function of time at constant shear rate for coal B at C (top), C (middle), and C (bottom).

Image of FIG. 8.
FIG. 8.

Dynamic temperature ramp tests before and after shearing coal B at C.

Image of FIG. 9.
FIG. 9.

Apparent viscosity as a function of time at constant shear rate for coal D at C (top), C (middle), and C (bottom).

Image of FIG. 10.
FIG. 10.

Proposed structural changes in coal during resolidification.

Image of FIG. 11.
FIG. 11.

Correlation between the yield time and the shear rate at the of coal B (C) and coal D (C).

Image of FIG. 12.
FIG. 12.

Complex viscosity as a function of temperature at different heating rates for coal B.

Image of FIG. 13.
FIG. 13.

Correlation between the minimum complex viscosity and the heating rate for coals B, C, and D.

Image of FIG. 14.
FIG. 14.

Effect of fast preheating/quenching on the linear viscoelastic properties of coal B.

Tables

Generic image for table
TABLE I.

Elemental analysis of the coals. daf: dry ash-free basis.

Generic image for table
TABLE II.

Proximate analysis and Gieseler data for the coals. db: dry basis. n.d.: not determined.

Generic image for table
TABLE III.

Maceral composition of the coals. n.d.: not determined.

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/content/sor/journal/jor2/51/5/10.1122/1.2754317
2007-09-01
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Use of high-temperature, high-torque rheometry to study the viscoelastic properties of coal during carbonization
http://aip.metastore.ingenta.com/content/sor/journal/jor2/51/5/10.1122/1.2754317
10.1122/1.2754317
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