Thermal decomposition and combustion characteristics of biomass materials using TG/DTG at different high heating rates and sizes in the air

2018 ◽  
Vol 38 (4) ◽  
pp. 13124
Author(s):  
Saad A. El‐Sayed ◽  
Mohamed A. Ismail ◽  
Mohamed E. Mostafa
Keyword(s):  
Thermal Decomposition ◽  
Combustion Characteristics ◽  
Heating Rates ◽  
High Heating ◽  
Biomass Materials

A FUNDAMENTAL STUDY ON THE COMBUSTION CHARACTERISTICS OF MUNICIPAL WASTE PLASTICS UNDER HIGH HEATING RATES

1995 ◽  
Author(s):  
Θωμαή Παναγιώτου
Keyword(s):  
Combustion Characteristics ◽  
Municipal Waste ◽  
Waste Plastics ◽  
Heating Rates ◽  
Fundamental Study ◽  
High Heating

ΑΥΤΗ Η ΕΡΓΑΣΙΑ ΕΙΝΑΙ ΜΙΑ ΒΑΣΙΚΗ ΕΡΕΥΝΑ ΕΠΑΝΩ ΣΤΗΝ ΚΑΥΣΗ ΠΛΑΣΤΙΚΩΝ ΠΟΥ ΒΡΙΣΚΟΝΤΑΙ ΣΤΑ ΑΠΟΡΡΙΜΑΤΑ (ΠΟΛΥ-ΣΤΥΡΕΝΙΟ (PS), ΠΟΛΥ-ΕΘΥΛΕΝΙΟ (ΡΕ) ΚΑΙ PVC). ΣΦΑΙΡΙΚΑ ΣΩΜΑΤΙΔΙΑ ΠΛΑΣΤΙΚΩΝ ΙΣΟΥ ΜΕΓΕΘΟΥΣ ΔΗΜΙΟΥΡΓΗΘΗΚΑΝ ΣΤΟ ΕΡΓΑΣΤΗΡΙΟ ΚΑΙ ΚΑΗΚΑΝ ΕΝΑ, ΕΝΑ ΣΕ ΗΛΕΚΤΡΙΚΟ ΦΟΥΡΝΟ ΚΑΙ ΘΕΡΜΟΚΡΑΣΙΕΣ 1040 -1400 Κ. Η ΚΑΥΣΗ ΤΩΝ ΣΩΜΑΤΙΔΙΩΝ ΜΕΛΕΤΗΘΗΚΕ ΜΕ ΕΝΑ ΤΡΙΧΡΩΜΑΤΙΚΟ ΠΥΡΟΜΕΤΡΟ ΚΑΙ ΜΙΑ ΥΨΗΛΗΣ ΤΑΧΗΤΗΤΑΣ ΚΙΝΗΜΑΤΟΓΡΑΦΙΚΗ ΜΗΧΑΝΗ, ΩΣΤΕ ΝΑ ΣΥΛΛΕΧΘΟΥΝ ΟΙ ΕΞΗΣ ΠΛΗΡΟΦΟΡΙΕΣ: Α) Ο ΧΡΟΝΟΣ ΤΗΣ ΚΑΥΣΗΣ, Β) ΤΟ ΕΙΔΟΣ ΤΗΣ ΚΑΥΣΗΣ (ΟΜΟΙΟΓΕΝΗΣ Η ΕΤΕΡΟΓΕΝΗΣ), Γ) ΤΟ ΠΑΧΟΣ ΤΗΣ ΦΛΟΓΑΣ ΚΑΙ Δ) Η ΤΑΧΥΤΗΤΑ ΠΤΩΣΗΣ ΤΩΝ ΣΩΜΑΤΙΔΙΩΝ. ΟΙ ΠΛΗΡΟΦΟΡΙΕΣ ΑΥΤΕΣ ΧΡΗΣΙΜΟΠΟΙΗΘΗΚΑΝ ΓΙΑ ΤΟΝ ΥΠΟΛΟΓΙΣΜΟ ΤΗΣ ΣΤΙΓΜΙΑΙΑΣ ΠΕΡΙΕΚΤΙΚΟΤΗΤΑΣ ΤΗΣ ΦΛΟΓΑΣ ΣΕ ΑΙΘΑΛΗ ΚΑΙ ΤΗΣ ΠΡΩΤΕΥΟΥΣΑΣ ΦΥΣΙΚΗΣ ΚΑΙ ΧΗΜΙΚΗΣ ΔΙΕΡΓΑΣΙΑΣ ΚΑΤΑ ΤΗΝ ΚΑΥΣΗ ΤΩΝ ΣΩΜΑΤΙΔΙΩΝ. ΚΑΘΕ ΥΛΙΚΟ ΠΑΡΟΥΣΙΑΣΕ ΜΟΝΑΔΙΚΑ ΧΑΡΑΚΤΗΡΙΣΤΙΚΑ ΚΑΥΣΗΣ. ΟΙ ΦΛΟΓΕΣ ΤΩΝ PVC ΣΩΜΑΤΙΔΙΩΝ ΕΙΧΑΝ ΤΗΝ ΜΕΓΑΛΥΤΕΡΗ ΠΕΡΙΕΚΤΙΚΟΤΗΤΑ ΣΕ ΑΙΘΑΛΗ, ΕΝΩ ΤΩΝ ΡΕ ΤΗΝ ΜΙΚΡΟΤΕΡΗ. Η ΤΑΧΥΤΗΤΑ ΚΑΥΣΗΣ ΤΩΝ PS ΣΩΜΑΤΙΔΙΩΝ ΒΡΕΘΗΚΕ ΟΤΙ ΕΞΑΡΤΑΤΑΙ ΑΠΟ ΤΗΝ ΤΑΧΥΤΗΤΑ ΔΙΑΧΥΣΗΣ ΣΤΗΝ ΑΕΡΙΑ ΦΑΣΗ, ΕΝΩ ΤΩΝ ΡΕ ΑΠΟ ΤΗΝ ΤΑΧΥΤΗΤΑ ΠΥΡΟΛΥΣΗΣ ΤΩΝ ΣΩΜΑΤΙΔΙΩΝ. Η ΑΝΑΦΛΕΞΗ ΤΩΝ PVC ΣΩΜΑΤΙΔΙΩΝ ΕΜΠΟΔΙΣΤΗΚΕ ΑΠΟ ΤΗΝ ΥΠΑΡΞΗ ΤΗΣ ΧΛΩΡΙΝΗΣ ΠΟΥ ΔΙΕΦΥΓΕ ΑΡΧΙΚΑ. ΟΤΑΝ Η ΚΑΥΣΗ ΑΡΧΙΣΕ, ΔΗΜΙΟΥΡΓΗΘΗΚΕ ΜΙΑ ΠΑΧΙΑ ΚΑΙ ΠΡΟΑΝΑΜΙΓΜΕΝΗ ΦΛΟΓΑ ΓΥΡΩΑΠΟ ΤΟ ΣΩΜΑΤΙΔΙΟ.

scholarly journals Modelling of Thermal Decomposition Kinetics of Proteins, Carbohydrates and Lipids Using Scenedesmus microalgae thermal Data

2020 ◽  
Vol 32 (11) ◽  
pp. 2921-2926
Author(s):  
BOTHWELL NYONI ◽  
PHUTI TSIPA ◽  
SIFUNDO DUMA ◽  
SHAKA SHABANGU ◽  
SHANGANYANE HLANGOTHI
Keyword(s):  
Activation Energy ◽  
Thermal Decomposition ◽  
Bulk Material ◽  
Decomposition Kinetics ◽  
Second Order ◽  
Thermal Decomposition Kinetics ◽  
Heating Rates ◽  
High Heating ◽  
The Individual ◽  
Kinetics Of

In present work, the thermal decomposition behaviour and kinetics of proteins, carbohydrates and lipids is studied by use of models derived from mass-loss data obtained from thermogravimetric analysis of Scenedesmus microalgae. The experimental results together with known decomposition temperature range values obtained from various literature were used in a deconvolution technique to model the thermal decomposition of proteins, carbohydrates and lipids. The models fitted well (R2 > 0.99) and revealed that the proteins have the highest reactivity followed by lipids and carbohydrates. Generally, the decomposition kinetics fitted well with the Coats-Redfern first and second order kinetics as evidenced by the high coefficients of determination (R2 > 0.9). For the experimental conditions used in this work (i.e. high heating rates), the thermal decomposition of protein follows second order kinetics with an activation energy in the range of 225.3-255.6 kJ/mol. The thermal decomposition of carbohydrate also follows second order kinetics with an activation energy in the range of 87.2-101.1 kJ/mol. The thermal decomposition of lipid follows first order kinetics with an activation energy in the range of 45-64.8 kJ/ mol. This work shows that the thermal decomposition kinetics of proteins, carbohydrates and lipids can be performed without the need of experimentally isolating the individual components from the bulk material. Furthermore, it was shown that at high heating rates, the decomposition temperatures of the individual components overlap resulting in some interactions that have a synergistic effect on the thermal reactivity of carbohydrates and lipids.

Solar thermal, decomposition kinetics of zinc sulfate at high heating rates

1989 ◽  
Vol 28 (3) ◽  
pp. 355-362 ◽  
Author(s):  
Ali Tabatabaie-Raissi ◽  
Ravi Narayan ◽  
William S. L. Mok ◽  
Michael J. Antal
Keyword(s):  
Thermal Decomposition ◽  
Zinc Sulfate ◽  
Decomposition Kinetics ◽  
Thermal Decomposition Kinetics ◽  
Solar Thermal ◽  
Heating Rates ◽  
High Heating ◽  
Kinetics Of

Comparing fast inductive tempering and conventional tempering: Effects on microstructure and mechanical properties

2018 ◽  
Vol 115 (4) ◽  
pp. 407 ◽  
Author(s):  
Annika Eggbauer Vieweg ◽  
Gerald Ressel ◽  
Peter Raninger ◽  
Petri Prevedel ◽  
Stefan Marsoner ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Impact Energy ◽  
Charpy Impact ◽  
Heat Treating ◽  
Processing Route ◽  
High Heating Rate ◽  
Heating Rates ◽  
High Heating ◽  
Tempering Treatment ◽  
Carbide Distribution

Induction heating processes are of rising interest within the heat treating industry. Using inductive tempering, a lot of production time can be saved compared to a conventional tempering treatment. However, it is not completely understood how fast inductive processes influence the quenched and tempered microstructure and the corresponding mechanical properties. The aim of this work is to highlight differences between inductive and conventional tempering processes and to suggest a possible processing route which results in optimized microstructures, as well as desirable mechanical properties. Therefore, the present work evaluates the influencing factors of high heating rates to tempering temperatures on the microstructure as well as hardness and Charpy impact energy. To this end, after quenching a 50CrMo4 steel three different induction tempering processes are carried out and the resulting properties are subsequently compared to a conventional tempering process. The results indicate that notch impact energy raises with increasing heating rates to tempering when realizing the same hardness of the samples. The positive effect of high heating rate on toughness is traced back to smaller carbide sizes, as well as smaller carbide spacing and more uniform carbide distribution over the sample.

Non-Isothermal Decomposition Kinetic of Polypropylene/Hydrotalcite Composite

2019 ◽  
Vol 19 (11) ◽  
pp. 7493-7501 ◽  
Author(s):  
Sheng Xu ◽  
Min Zhang ◽  
Siyu Li ◽  
Moyu Yi ◽  
Shigen Shen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Nitrogen Atmosphere ◽  
Heating Rates ◽  
Decomposition Reactions ◽  
Kinetic And Thermodynamic Parameters ◽  
Málek Method ◽  
Boundary Reaction ◽  
Phase Boundary Reaction ◽  
Thermal Stability Of

P3O5-10 pillared Mg/Al hydrotalcite (HTs) as a functional fire-retarding filler was successfully prepared by impregnation-reconstruction, where the HTs was used to prepare polypropylene (PP) and HTs composite (PP/HTs). Thermal decomposition was crucial for correctly identifying the thermal behavior for the PP/HTs, and studied using thermogravimetry (TG) at different heating rates. Based on single TG curves and Málek method, as well as 41 mechanism functions, the thermal decompositions of the PP/HTs composite and PP in nitrogen atmosphere were studied under non-isothermal conditions. The mechanism functions of the thermal decomposition reactions for the PP/HTs composite and PP were separately “chemical reaction F3” and “phase boundary reaction R2,” which were also in good agreement with corresponding experimental data. It was found that the addition of the HTs increased the apparent activation energy Ea of the PP/HTs comparing to the PP, which improved the thermal stability of the polypropylene. A difference in the set of kinetic and thermodynamic parameters was also observed between the PP/HTs and PP, particularly with respect to lower ΔS≠ value assigned to higher thermal stability of the PP/HTs composite.

scholarly journals Kinetic modelling for thermal decomposition of agricultural residues at different heating rates

2021 ◽  
Author(s):  
Hemant Kumar Balsora ◽  
S. Kartik ◽  
Thomas J. Rainey ◽  
Ali Abbas ◽  
Jyeshtharaj Bhalchandra Joshi ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Kinetic Modelling ◽  
Agricultural Residues ◽  
Heating Rates
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