Pyrolysis characteristic and kinetic analysis of sewage sludge using model-free and master plots methods

2021 ◽  
Vol 149 ◽  
pp. 48-55
Author(s):  
Huidong Liu ◽  
Guoren Xu ◽  
Guibai Li
Keyword(s):  
Sewage Sludge ◽  
Kinetic Analysis ◽  
Model Free ◽  
Master Plots

scholarly journals Kinetic Analysis of Digestate Slow Pyrolysis with the Application of the Master-Plots Method and Independent Parallel Reactions Scheme

Molecules ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1657 ◽  
Author(s):  
Pietro Bartocci ◽  
Roman Tschentscher ◽  
Ruth Elisabeth Stensrød ◽  
Marco Barbanera ◽  
Francesco Fantozzi
Keyword(s):  
Activation Energy ◽  
Kinetic Analysis ◽  
Single Step ◽  
Conversion Degree ◽  
Pyrolysis Process ◽  
Average Value ◽  
Model Free ◽  
Master Plots Method ◽  
Master Plots ◽  
Parallel Reactions

The solid fraction obtained by mechanical separation of digestate from anaerobic digestion plants is an attractive feedstock for the pyrolysis process. Especially in the case of digestate obtained from biogas plants fed with energy crops, this can be considered a lignin rich residue. The aim of this study is to investigate the pyrolytic kinetic characteristics of solid digestate. The Starink model-free method has been used for the kinetic analysis of the pyrolysis process. The average Activation Energy value is about 204.1 kJ/mol, with a standard deviation of 25 kJ/mol, which corresponds to the 12% of the average value. The activation energy decreased along with the conversion degree. The variation range of the activation energy is about 99 kJ/mol, this means that the average value cannot be used to statistically represent the whole reaction. The Master-plots method was used for the determination of the kinetic model, obtaining that n-order was the most probable one. On the other hand, the process cannot be modeled with a single-step reaction. For this reason it has been used an independent parallel reactions scheme to model the complete process.

Drying behavior and thermo-gravimetrical kinetic analysis of foam-pretreated sewage sludge

RSC Advances ◽  
2015 ◽  
Vol 5 (100) ◽  
pp. 82227-82236
Author(s):  
Ting Chen ◽  
Zhao-Hui Yang ◽  
Jing Huang ◽  
Rui Xu ◽  
Hai-yin Xu ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Kinetic Analysis ◽  
Drying Behavior ◽  
Pretreatment Technology

An innovative pretreatment technology, in which CaO was jointly added with NaOH followed by appropriate mechanical whipping, was investigated for the foaming and drying of sewage sludge (SS).

Co-combustion of different sewage sludge and coal: A non-isothermal thermogravimetric kinetic analysis

2008 ◽  
Vol 99 (14) ◽  
pp. 6311-6319 ◽  
Author(s):  
M OTERO ◽  
L CALVO ◽  
M GIL ◽  
A GARCIA ◽  
A MORAN
Keyword(s):  
Sewage Sludge ◽  
Kinetic Analysis

scholarly journals Kinetic Analysis of the Thermal Degradation of Recycled Acrylonitrile-Butadiene-Styrene by non-Isothermal Thermogravimetry

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 281 ◽  
Author(s):  
Rafael Balart ◽  
David Garcia-Sanoguera ◽  
Luis Quiles-Carrillo ◽  
Nestor Montanes ◽  
Sergio Torres-Giner
Keyword(s):  
Thermal Degradation ◽  
Kinetic Analysis ◽  
Acrylonitrile Butadiene Styrene ◽  
Isoconversional Methods ◽  
Reaction Model ◽  
Integral Model ◽  
Heating Rates ◽  
Exponential Factor ◽  
Model Free ◽  
Butadiene Styrene

This work presents an in-depth kinetic study of the thermal degradation of recycled acrylonitrile-butadiene-styrene (ABS) polymer. Non-isothermal thermogravimetric analysis (TGA) data in nitrogen atmosphere at different heating rates comprised between 2 and 30 K min−1 were used to obtain the apparent activation energy (Ea) of the thermal degradation process of ABS by isoconversional (differential and integral) model-free methods. Among others, the differential Friedman method was used. Regarding integral methods, several methods with different approximations of the temperature integral were used, which gave different accuracies in Ea. In particular, the Flynn-Wall-Ozawa (FWO), the Kissinger-Akahira-Sunose (KAS), and the Starink methods were used. The results obtained by these methods were compared to the Kissinger method based on peak temperature (Tm) measurements at the maximum degradation rate. Combined Kinetic Analysis (CKA) was also carried out by using a modified expression derived from the general Sestak-Berggren equation with excellent results compared with the previous methods. Isoconversional methods revealed negligible variation of Ea with the conversion. Furthermore, the reaction model was assessed by calculating the characteristic and functions and comparing them with some master plots, resulting in a nth order reaction model with n = 1.4950, which allowed calculating the pre-exponential factor (A) of the Arrhenius constant. The results showed that Ea of the thermal degradation of ABS was 163.3 kJ mol−1, while ln A was 27.5410 (A in min−1). The predicted values obtained by integration of the general kinetic expression with the calculated kinetic triplet were in full agreement with the experimental data, thus giving evidence of the accuracy of the obtained kinetic parameters.

scholarly journals Kinetic Analysis of Durian Rind Pyrolysis Using Model-Free Method

2020 ◽  
Vol 586 ◽  
pp. 012002
Author(s):  
A Bampenrat ◽  
A Boonkitkoson ◽  
T Seangwattana ◽  
P Suttiarporn ◽  
H Sukkathanyawat
Keyword(s):  
Kinetic Analysis ◽  
Model Free ◽  
Durian Rind

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.

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