Determination of thermal decomposition kinetics of low grade coal employing thermogravimetric analysis

Information on the pyrolysis degradation kinetics of feedstock is critical for the design and fabrication of pyrolysis reactors. In this study, the pyrolytic behaviour of a novel biomass, camel manure, has been studied in a non-isothermal thermogravimetric analyser. The thermal analyses were performed from room temperature to 950 °C at different heating rates (10, 20, and 50°C/min) in an N2 environment (100 ml/min). The kinetic parameters of the manure components are determined using an Arrhenius model equation, and the influence of heating rate on the pyrolytic characteristics and kinetic parameters of the manure components has been examined. The results indicated that the increase in heating rates increased the starting and ending temperatures (decomposition) of manure components. The increase in heating rates shifted the ignition, peak, and burnout temperatures to higher temperatures. At the same time, the increase in heating rates improved the char yield from 22.50 to 31.51%. However, the increase in heating rates showed an insignificant effect on the kinetic parameters of the camel manure components.

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“…An Arrhenius model has been applied to estimate the kinetic factors of the camel manure components undergoing pyrolysis [39,40].…”

Section: Theoretical Backdrop-arrhenius Modelmentioning

confidence: 99%

Effect of heating rate on the pyrolysis of camel manure

Parthasarathy

Al‐Ansari

Mackey

et al. 2021

Biomass Conv. Bioref.

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“…In previous kinetic studies, the coal pyrolysis ,− was investigated using TGA and DTA methods with different heating rates and explained in three stages: (1) water evaporation stage (below 378 K), (2) devolatilization stage (between 378 and 873 K), and (3) char formation stage (above 873 K). The kinetic results of previous studies are summarized in Table . , There are three apparent activation energies ( E a ) for each temperature range.…”

Section: Resultsmentioning

confidence: 99%

“…Thermal decomposition reaction of coal is very complicated, comprising many chain and parallel reactions. Hence, most studies have used a simplified model of a single first-order irreversible reaction for thermal decomposition to determine the pyrolysis kinetics. ,,,,− ,− The thermal decomposition of coal can be expressed by the following reaction as where X A is the dimensionless thermal decomposition (weight loss) ratio of coal. At time t , X A can be calculated as shown in eq where m i is the initial mass, m a is the mass of ash, and m t is the mass of the sample at time t in the fixed bed reactor.…”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

“…The kinetic models of these type of studies were proposed by Heydari et al, 4 Choi et al, 15 Song et al, 16 Guo et al, 17 Urych, 18 Scaccia, 19 and Ashraf et al 20 However, these types of kinetic models were obtained for the condition of increasing temperature with constant or programed heating rates. When these models are used for pyrolysis prediction, the amount of volatile matter could not be evaluated owing to the change of the reaction mechanism with pyrolysis time.…”

Section: Introductionmentioning

confidence: 99%

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A Method for Predicting the Amount of Volatile Matter Depending on Time of Pyrolysis Process of Low-Rank Coal

Bayartsaikhan

Kim

2019

Energy Fuels

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Although the pyrolysis of coal has been studied for centuries, only few methods, which can evaluate the amount of volatile matter in the case of a change in the reaction mechanism with pyrolysis time, have been developed. In this study, a method for accurately predicting the volatile amount of brown coal depending on temperature and time of pyrolysis has been studied in isothermal condition. This method is based on the kinetic parameters obtained from the pyrolysis process. The kinetic parameters were determined using the first-order series reaction model, which consists of two steps: the first step is rapid weight loss with free radical reaction, and the second step consists of slow weight loss with condensation reaction (char formation). Both steps follow a first-order reaction with different reaction rate constants, which are obtained from the graph of ln(1 – X A) versus the pyrolysis time at each given pyrolysis temperature. The validity of this new method for estimation of the final amount of volatile matter was proven by comparing these results with the experimental results of the pyrolysis of three different Mongolian brown coals. In this estimation, the average absolute error (AAE) is very low (<2%) and the correlation coefficient (R 2) is very high (≥0.99). This proposed two-step reaction model gives a good prediction of the final volatile amount, and the calculated results are in good compliance with the experimental values.

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Thermal decomposition kinetics of Prosopis juliflora charcoal briquette using thermogravimetric analysis

Kumar

Ramesh

2022

Environ Sci Pollut Res

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Determination of thermal decomposition kinetics of low grade coal employing thermogravimetric analysis

Cited by 4 publications

References 54 publications

Effect of heating rate on the pyrolysis of camel manure

Effect of heating rate on the pyrolysis of camel manure

A Method for Predicting the Amount of Volatile Matter Depending on Time of Pyrolysis Process of Low-Rank Coal

Thermal decomposition kinetics of Prosopis juliflora charcoal briquette using thermogravimetric analysis

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