Distributed Activation Energy Model Parameters of Some Turkish Coals

Abstract

A multi-reaction model based on distributed activation energy has been applied to some Turkish coals. The kinetic parameters of distributed activation energy model were calculated via computer program developed for this purpose. It was observed that the values of mean of activation energy distribution vary between 218 and 248 kJ/mol, and the values of standard deviation of activation energy distribution vary between 32 and 70 kJ/mol. The correlations between kinetic parameters of the distributed activation energy model and certain properties of coal have been investigated.

Kinetic Study and Thermal Decomposition Behavior of Lignite Coal

“…The kinetic data obtained for pyrolysis of coal are found to agree closely with some of the literature data. However, the differences observed in the literature data can be attributed to the fact that the pyrolysis characteristics of coal highly depend on the properties of the coal which in turn differs based on origin of the coal [28,30,31].…”

“…Major volatile matter at this stage liberated from coal structure that was formed by thermal decomposition some covalent bond such as ether bonds and methylene group which will form gases such as hydrogen, carbon monoxide, and lighter hydrocarbons [29]. This region is the most significant region to examine since the major weight loss and complicated chemical reaction, such as release of tar and gaseous products and semicoke formation, take place in this temperature range [30,31]. The third zone, that is, the second pyrolysis stage, where low decomposition rates are observed can be attributed to the further gasification of the formed char due to high temperature effects.…”

Pyrolysis of biofuels of the future: Sewage sludge and microalgae – Thermogravimetric analysis and modelling of the pyrolysis under different temperature conditions

“…Miura [16] and Miura and Maki [17] proposed a simplification for DAEM to easily obtain the activation energy and the pre-exponential factor of a sample from different thermogravimetric analysis (TGA) tests. This simplified DAEM has been employed, achieving a proper agreement with experimental measurements, for a wide variety of samples, such as coal [18], charcoal [19], polymers [20], oil shale [21], medical waste [22], sewage sludge [23], microalgae [24,25], and several different types of biomass [26,27,28,29,30,31].…”

Analysis of biomass and sewage sludge devolatilization using the distributed activation energy model

“…They used their method to describe the pyrolysis of several kinds of coal. In the last years, this procedure has been thoroughly employed to analyze the kinetics of pyrolysis of different samples of coal [17,18], charcoal [19], oil shale [20], polymers [21], medical waste [22], and biomass [23 26].…”