Kinetics of coal pyrolysis and devolatilization Page: 4 of 60
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2
distribution and char morphology on the transient particle temperature history
are explicitly stated.
It is obvious from the brief description above that an engineering
kinetics model will only be as valid and generally applicable as the
fundamental understanding that serves as its basis. Unless a correct
phenomenological description of coal devolatilization can be formulated on the
basis of an accurate understanding of coal structure and behavior, an
empirical, engineering description of coal devolatilization is not possible.
"Engineering" herein means less chemical detail regarding product composition
and structure, not less accuracy with respect to the rates of particle mass
loss.
The significance of development of a fundamental understanding of coal
devolatilization and accurate descriptions of the rates of coal
devolatilization requires an understanding of the coal combustion process.
Figure 1 shows the coal combustion sequence, indicating coal itself does not
burn, but rather rapidly devolatilizes. The resultant volatiles and char
species burn. The volatiles combustion process contributes to the near burner
flame stability peak flame temperatures, and is directly responsible for
major fractions of the flame sooting tendency, and fuel related NC>x
formation. The devolatilization process and volatiles burnout process are
indirectly responsible for char burnout times by determining aerodynamic and
reactivity properties of the resultant char particles, that is, particle
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Kinetics of coal pyrolysis and devolatilization, report, January 1, 1987; United States. (https://digital.library.unt.edu/ark:/67531/metadc1066995/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.