Pyrolysis kinetic parameters investigation of single and tri-component biomass: Models fitting via comparative model-free methods

2021 ◽  
Author(s):  
Kiattikhoon Phuakpunk ◽  
Benjapon Chalermsinsuwan ◽  
Suttichai Assabumrungrat
Keyword(s):  
Kinetic Parameters ◽  
Model Free ◽  
Biomass Models ◽  
Comparative Model ◽  
Pyrolysis Kinetic

scholarly journals Energy Utilization of Building Insulation Waste Expanded Polystyrene: Pyrolysis Kinetic Estimation by a New Comprehensive Method

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1744 ◽  
Author(s):  
Xiaoyang Ni ◽  
Zheng Wu ◽  
Wenlong Zhang ◽  
Kaihua Lu ◽  
Yanming Ding ◽  
...  
Keyword(s):  
Kinetic Parameters ◽  
Thermal Insulation ◽  
Large Scale ◽  
Model Fitting ◽  
Pso Algorithm ◽  
Expanded Polystyrene ◽  
Energy Utilization ◽  
Pyrolysis Kinetics ◽  
Model Free ◽  
Pyrolysis Kinetic

Expanded polystyrene (EPS) has excellent thermal insulation properties and is widely applied in building energy conservation. However, these thermal insulation materials have caused numerous fires because of flammability. Pyrolysis is necessary to support combustion, and more attention should be paid to the pyrolysis characteristics of EPS. Moreover, pyrolysis is considered to be an effective method for recycling solid waste. Pyrolysis kinetics of EPS were analyzed by thermogravimetric experiments, both in nitrogen and air atmospheres. A new method was proposed to couple the Flynn–Wall–Ozawa model-free method and the model-fitting method called the Coats–Redfern as well as the particle swarm optimization (PSO) global algorithm to establish reaction mechanisms and their corresponding kinetic parameters. It was found that the pyrolysis temperature of EPS was concentrated at 525–800 K. The activation energy of EPS in nitrogen was about 163 kJ/mol, which was higher than that in air (109.63 kJ/mol). Furthermore, coupled with Coats–Redfern method, reaction functions g(α) = 1 − (1 − α)3 and g(α) = 1 − (1 − α)1/4 should be responsible for nitrogen and air reactions, respectively. The PSO algorithm was applied to compute detailed pyrolysis kinetic parameters. Kinetic parameters could be used in further large-scale fire simulation and provide guidance for reactor design.

scholarly journals Kinetic Analysis of the Thermal Decomposition of Polymer-Bonded Explosive Based on PETN: Model-Fitting Method and Isoconversional Method

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Trung Toan Nguyen ◽  
Duc Nhan Phan ◽  
Van Thom Do ◽  
Hoang Nam Nguyen
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Parameters ◽  
Model Fitting ◽  
Isoconversional Method ◽  
Isothermal Tg ◽  
Decomposition Reactions ◽  
Model Free ◽  
Negative Effect ◽  
Adverse Influence ◽  
Vacuum Stability Test

This work investigates kinetics and thermal decomposition behaviors of pentaerythritol tetranitrate (PETN) and two polymer-bonded explosive (PBX) samples created from PETN (named as PBX-PN-85 and PBX-PP-85) using the vacuum stability test (VST) and thermogravimetry (TG/DTG) techniques. Both model-free (isoconversional) and model-fitting methods were applied to determine the kinetic parameters of the thermal decomposition. It was found that kinetic parameters obtained by the modified Kissinger–Akahira–Sunose method (using non-isothermal TG/DTG data) were close to those obtained by the isoconversional and model-fitting methods that use isothermal VST data. The activation energy values of thermal decomposition reactions were 125.6–137.1, 137.3–144.9, and 143.9–152.4 kJ·mol−1 for PBX-PN-85, PETN, and PBX-PP-85, respectively. The results demonstrate the negative effect of the nitrocellulose-based binder in reducing the thermal stability of single PETN, while the polystyrene-based binder seemingly shows no adverse influence on the thermal decomposition of PETN in our presented PBX compositions.

Prediction of pyrolysis kinetic parameters from biomass constituents based on simplex-lattice mixture design

2016 ◽  
Vol 24 (4) ◽  
pp. 535-542 ◽  
Author(s):  
Panusit Sungsuk ◽  
Sasiporn Chayaporn ◽  
Sasithorn Sunphorka ◽  
Prapan Kuchonthara ◽  
Pornpote Piumsomboon ◽  
...  
Keyword(s):  
Kinetic Parameters ◽  
Mixture Design ◽  
Simplex Lattice ◽  
Simplex Lattice Mixture Design ◽  
Pyrolysis Kinetic

scholarly journals Kinetics of Solid-Gas Reactions and Their Application to Carbonate Looping Systems

Energies ◽  
2019 ◽  
Vol 12 (15) ◽  
pp. 2981 ◽  
Author(s):  
Larissa Fedunik-Hofman ◽  
Alicia Bayon ◽  
Scott W. Donne
Keyword(s):  
Kinetic Analysis ◽  
Kinetic Parameters ◽  
Carbon Capture ◽  
Large Scale ◽  
Chemical Engineering ◽  
Kinetic Method ◽  
Experimental Conditions ◽  
Exponential Factor ◽  
Model Free ◽  
Gas Reactions

Reaction kinetics is an important field of study in chemical engineering to translate laboratory-scale studies to large-scale reactor conditions. The procedures used to determine kinetic parameters (activation energy, pre-exponential factor and the reaction model) include model-fitting, model-free and generalized methods, which have been extensively used in published literature to model solid-gas reactions. A comprehensive review of kinetic analysis methods will be presented using the example of carbonate looping, an important process applied to thermochemical energy storage and carbon capture technologies. The kinetic parameters obtained by different methods for both the calcination and carbonation reactions are compared. The experimental conditions, material properties and the kinetic method are found to strongly influence the kinetic parameters and recommendations are provided for the analysis of both reactions. Of the methods, isoconversional techniques are encouraged to arrive at non-mechanistic parameters for calcination, while for carbonation, material characterization is recommended before choosing a specific kinetic analysis method.

scholarly journals Comparison of wood pyrolysis kinetic data derived from thermogravimetric experiments by model-fitting and model-free methods

2020 ◽  
Vol 212 ◽  
pp. 112818 ◽  
Author(s):  
Antonio Soria-Verdugo ◽  
Marco Tomasi Morgano ◽  
Hartmut Mätzing ◽  
Elke Goos ◽  
Hans Leibold ◽  
...  
Keyword(s):  
Kinetic Data ◽  
Model Fitting ◽  
Wood Pyrolysis ◽  
Model Free ◽  
Pyrolysis Kinetic

Kinetic Modeling of the Thermal Degradation of Methacrylate Copolymers by Thermogravimetric Methods

2007 ◽  
Vol 5 (1) ◽  
Author(s):  
Ali Habibi ◽  
Juray De Wilde
Keyword(s):  
Molecular Weight ◽  
Thermal Degradation ◽  
Kinetic Parameters ◽  
Average Molecular Weight ◽  
Model Fitting ◽  
Continuous Distribution ◽  
Thermal Degradation Kinetics ◽  
Polymer Backbone ◽  
Model Free ◽  
Degradation Step

The thermal degradation kinetics of a random copolymer of isobutyl methacrylate / lauryl methacrylate, produced by free-radical solution polymerization is investigated over a temperature range of 350 to 750 K, using dynamic thermogravimetric experiments. Heat treatment of the copolymer affects the main polymer backbone and side chains. The thermal degradation of the copolymer proceeds in three distinct steps of weight loss: the first and easiest step is initiated by scissions of head-to-head linkages representing one type of defect in the polymer backbone; the second and more difficult step is initiated by scissions at the vinylidene chain ends; the third and most energetic step is initiated by random scissions within the polymer chain.The time evolution of molecular weight distribution (MWD) is measured by gel permeation chromatography (GPC). The most pronounced changes in the trend of the average molecular weight are observed during the transition from each degradation step to the subsequent one. A continuous distribution kinetic model based on a population balance is developed to describe the observed degradation behaviour of the copolymer. This comprehensive model conforms to the special mechanisms for random chain-scission and chain-end depolymerization. The pseudo-kinetic rate parameters for each degradation step are estimated to be respectively equal to 1.1 10-8, 5.6 10-8 and 1.08 10-7 mol g-1 min-1. The average calculated activation energies are respectively 89.2, 116.4 and 134.8 kJ/mol.Global kinetic parameters of degradation are also determined using dynamic thermogravimetric (TGA/DTGA) data. The model-fitting and model-free isoconversional methods are used to retrieve the kinetic parameters of the degradation process. The model-free isoconversional method can satisfactorily describe the dependence of the activation energy on the conversion and is recommended over the model-fitting methods for obtaining the reliable and consistent kinetic parameters of polymer degradation.

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