Abstract

ROJAS, Andrés; BARRAZA, Juan  and  BARRANCO, Richelieu. A new reaction rate constant for char combustion- formulation. Rev.fac.ing.univ. Antioquia [online]. 2008, n.45, pp.7-16. ISSN 0120-6230.

This paper shows the development and formulation of a new reaction rate constant of combustion for pulverized coal. The chemical reaction rate was considered as a function of coal intrinsic reactivity and fuel mass for a reaction order n. The equation for reaction rate constant was developed by dimensional analysis using the Rayleigh method. This equation is new, dimensionless and shows the dependency of the chemical reactivity on coal parameters such as maceral and mineral composition; char parameters, including specify surface area and apparent density, devolatilization time, temperature, and activation energy. The reaction rate constant model presents dimensional consistency and it is described by three dimensionless numbers having physical or chemical significance.

Keywords : Char; combustion model; reaction rate constant; intrinsic reactivity.

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