Oxidation reactivity of coal chars: a simple kinetic analysis


Sima-Ella, E. and Mays, T., 2005. Oxidation reactivity of coal chars: a simple kinetic analysis. In: World Congress of Chemical Engineering, 7th, 2005-07-10 - 2005-07-14, Glasgow.

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The intrinsic reactivity in air of three ranks of coals as anthracite, bituminous and subbituminous, was investigated using a new thermogravimetric technique. The conventional single heating rate measurement is enhanced by identifying an optimum-heating rate at which mass transfer limitations are reduced, and true kinetic data are derived. This anal. is presented using the simplest approxn. of the temp. integral from the Arrhenius equation. An optimum-heating rate of 25 DegC min-1 was obsd. for all the different type of coals, producing reactivity data that correspond to those proposed in the literature for similar materials. Furthermore, these results were compared with values derived from using an existing "isoconversional" anal. approach. They showed good agreement. Such an improved thermogravimetric anal. is relatively simple and sufficiently accurate for applications in coal characterization. [on SciFinder (R)]


Item Type Conference or Workshop Items (Paper)
CreatorsSima-Ella, E.and Mays, T.
Uncontrolled Keywordscoal char oxidn reactivity coal combustion kinetics, proc (process) (oxidn. reactivity of coal chars, semicoke role, reactivity (oxidn. reactivity of coal chars, combustion kinetics, oxidation, a simple kinetic anal.), pep (physical, cps (chemical process), engineering or chemical process)
DepartmentsFaculty of Engineering & Design > Chemical Engineering
ID Code896


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