Thermal decomposition study and pyrolysis kinetics of coal and agricultural residues under non-isothermal conditions

Ashraf, Asma; Sattar, H.; Munir, Shahid

doi:10.1016/j.fuel.2018.07.120

Cited by 81 publications

(21 citation statements)

References 52 publications

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“…Initially, samples were heated from room temperature to 105°C. Four specific heating rates (10,20,30, and 40°C/min) were adopted to reach final temperature of 1000°C. A holding time of 10 minutes and 30 minutes was insured at temperature of 105°C and 1000°C, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…The application of this model has been reported satisfactory by many researchers. 41 (10,20,30, and 40°C/min). It is important to define the extent of conversion through an observable adequate physical property.…”

Section: Flynn-wall-ozawa Methodsmentioning

confidence: 99%

“…Many researchers have employed this approach for approximation of reaction kinetics in solid particles. 20,[32][33][34][35][36][37][38][39][40][41][42][43] E α (apparent activation energy) can be calculated for respective conversion value (α) by estimating resultant slope of Equation 5and 1/T α,i .…”

Section: Friedman Differential Modelmentioning

confidence: 99%

“…Many researchers have utilized the TGA analysis to evaluate kinetics of combustion process in incineration by developing various kinetic models. [17][18][19][20][21][22] Typically, two kinds of kinetic models are employed such as model-free (isoconversional) and model-fitting. In this paper, isoconversional methods were adopted, as these methods are reflected as more reliable and accurate compared to complex data fitting methods that are generally dependent to type of reaction mechanism and lead to imprecise data estimation over wide experimental range.…”

Section: Introductionmentioning

confidence: 99%

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Isoconversional nonisothermal kinetic analysis of municipal solid waste, refuse‐derived fuel, and coal

Azam

Ashraf

Jahromy

et al. 2020

Energy Science & Engineering

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Section: Methodsmentioning

confidence: 99%

Section: Flynn-wall-ozawa Methodsmentioning

confidence: 99%

Section: Friedman Differential Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Isoconversional nonisothermal kinetic analysis of municipal solid waste, refuse‐derived fuel, and coal

Azam

Ashraf

Jahromy

et al. 2020

Energy Science & Engineering

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“…Thermal analysis or thermogravimetric analysis (TGA) is extensively used technique to analyze the decomposition mechanism. Ultimately, researchers have used TGA data for the determination of kinetic parameters to develop kinetic models, which helps in the quantitative description of different thermochemical conversion processes . The two main difficulties in developing kinetic models are involvement of parallel and multiseries decomposition reactions and the heterogeneous nature of solid fuel particles during decomposition process.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the combustion characteristics and kinetic study of coal, municipal solid waste, and refuse‐derived fuel: Model‐fitting methods

Azam

Jahromy

Raza

et al. 2019

Energy Science & Engineering

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Energy crisis and solid waste management have remained challenging issues for authorities in Pakistan. These issues tend to rise with increasing population and economic growth of the society. Therefore, environmentally sustainable waste‐to‐energy program must be part of the waste management system since they may substitute fossil fuels with renewable energy sources by enabling energy recovery instead of landfill of solid wastes. In this work, the combustion characteristics of fossil fuel (coal) and solid wastes such as municipal solid waste (MSW) and refuse‐derived fuel (RDF) were investigated by thermogravimetric analysis (TGA) to compare their thermal decomposition behavior. Furthermore, proximate and ultimate analyses of these samples were carried out along with their heating values. The TGA profiles of samples indicate low reactivity of coal, whereas solid wastes present greater reaction rate reflecting their low ash and high volatile contents. It was found that the heating value of RDF sample was close to that of coal. The obtained thermal data were used to calculate the kinetic parameters using Arrhenius and Coats‐Redfern models with different reaction mechanisms. According to these models, the fuels could be arranged in order of activation energy as coal > RDF > MSW. The percentage difference between activation energy values found from Arrhenius and Coats‐Redfern models was in the range of 4.1%‐26.5%. However, the Coats‐Redfern model exhibited consistency in activation energy values, followed by a high value of R2. These results of the TGA could be very helpful to predict the combustion dynamics and confirm that MSW and RDF may be used as sustainable fuels, to meet the prevailing challenges of the energy crisis and solid waste management.

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Pyrolysis kinetics and activation thermodynamic parameters of exhausted coffee residue and coffee husk using thermogravimetric analysis

et al. 2021

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Exhausted coffee residue (ECR) and coffee husk (CH) are potential feedstock for energy production through thermochemical and biochemical conversion processes. Kinetic study of ECR and CH is essential for the design and optimization of different thermochemical conversion processes. In this study, four different iso‐conversional methods were employed in the estimation of the activation energy (EA) and pre‐exponential factor (A). The methods used includes Flynn‐Wall‐Ozawa (FWO), Kissinger‐Akahira‐Sunose (KAS), Kissinger's method, and the Friedman method. Data from the thermogravimetric/derivative thermogravimetric analysis (TGA/DTG) at varying heating rates of 5‐20°C/min in an inert environment were used in this study. It was observed that the heating rate influences the pyrolysis parameters such as peak temperature, maximum degradation rate and initial decomposition temperature. The activation energy for ECR using the FWO method was in the range of 62.3‐102.4 kJ · mol−1. Likewise, the KAS and Friedman methods yielded activation energy between 51.3‐93.3 kJ · mol−1 and 10.6‐122.7 kJ · mol−1, respectively. In addition, the activation energy calculated for CH using FWO, KAS, and Friedman methods were shown to range from 39.1‐140.6 kJ · mol−1, 27.7‐131.6 kJ · mol−1, and 24.9‐111.2 kJ · mol−1, respectively.

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Thermal decomposition study and pyrolysis kinetics of coal and agricultural residues under non-isothermal conditions

Cited by 81 publications

References 52 publications

Isoconversional nonisothermal kinetic analysis of municipal solid waste, refuse‐derived fuel, and coal

Isoconversional nonisothermal kinetic analysis of municipal solid waste, refuse‐derived fuel, and coal

Comparison of the combustion characteristics and kinetic study of coal, municipal solid waste, and refuse‐derived fuel: Model‐fitting methods

Pyrolysis kinetics and activation thermodynamic parameters of exhausted coffee residue and coffee husk using thermogravimetric analysis

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