Thermogravimetric and mass spectrometric (TG-MS) analysis and kinetics of coal-biomass blends

Jayaraman, Kandasamy; Kök, Mustafa Verşan; Gökalp, I.

doi:10.1016/j.renene.2016.08.072

Cited by 170 publications

(66 citation statements)

References 26 publications

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“…Further bond breaking occurs and evolution of organic matter as tar, gases, and condensation reaction also takes place at this region. In addition, it was shown as in Figure 6 that a reduction was observed in ignition temperatures as the particle size decreased [15].…”

Section: Thermal Behaviour Of the Enriched Coalmentioning

confidence: 74%

“…The thermal behaviour of coal is determined mostly by using TG. Although, many works on biomass combustion with TG [11][12][13][14][15] and coal combustion [16][17][18][19][20][21][22][23] are available in the literature, investigations on 'enriched coal' are rather less [24][25][26]. The enrichment of coal provides an opportunity for the separation of coals and their maceral composition due to the difference of densities [27].…”

Section: Journal Of Combustionmentioning

confidence: 99%

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Investigation of the Thermal Improvement and the Kinetic Analysis of the Enriched Coal

Duzyol

Şensöğüt

2018

Journal of Combustion

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The present research work is comprised of three main parts. The first part is about the enrichment of lignite coal by the utilization of dense medium separation called float and sink method. The second part deals with the investigation of the thermal behaviour for the coals enriched while the last part is concerned with the kinetic analysis of the coal combustion. The float and sink method is the mostly used technique for low-rank coal beneficiation in coal preparation plants of Turkey. In order to realize this process, the coal samples were, at first, fractioned to five different sizes which were -32+25 mm, -25+16 mm, -16+8 mm, -8+4.75 mm, and -4.75+2 mm. Each fraction was, then, processed in the dense mediums with the specific gravities of 1.20, 1.30, 1.40, 1.50, and 1.60 g/cm3, respectively. The thermal behaviour of the floated materials from the float and sink process was investigated in detail with the thermogravimetric analysis (TG) and the differential thermogravimetric analysis (DTG). The ignition and peak temperatures for the samples were also ascertained and correlated with the float and sink test results. In the final part of the study, the kinetic analysis of the coal samples was carried out by the Coats–Redfern method and the activation energies of the enriched coals were determined. The activation energies of the raw and the enriched coals were assessed and compared. The calculated activation energy values for the combustion reactions of the coal samples ranged were found to be between 15.17 kJ/mol and 97.45 kJ/mol. The strong correlation was obtained between the float and sink test results especially with the ash content of the coal samples and the combustible characteristic of the floated materials such as ignition temperatures, peak temperatures, and activation energies. The combustion characteristics of the coal samples were resultantly ascertained to be very dependent on the coal structure.

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Section: Thermal Behaviour Of the Enriched Coalmentioning

confidence: 74%

Section: Journal Of Combustionmentioning

confidence: 99%

Investigation of the Thermal Improvement and the Kinetic Analysis of the Enriched Coal

Duzyol

Şensöğüt

2018

Journal of Combustion

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“…where α is reaction fraction, %; t is reaction time, s; k is reaction rate constant, s -1 ; A is frequency factor, s -1 ; E is active energy, kJ/mol; R is gas constant 8.314, T is temperature, K; β the heating rate, K/min; n is reaction order number; Tp the peak temperature, K; f(α) and G(α) are integral expressions depended on the particular decomposition mechanism of solid reaction listed in Table 1 [27][28][29].…”

Section: The Experimental Proceduresmentioning

confidence: 99%

Thermodynamic and kinetics analysis of the sulfur-fixed roasting of antimony sulfide using ZnO as sulfur-fixing agent

Ouyang

Chen

Tian

et al. 2018

J min metall B Metall

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Currently, the commercial antimony metallurgy is mainly based on pyrometallurgical processes and oxidative volatilization of Sb 2 S 3 is an essential step. This step includes the problems of high energy consumption and low concentration of SO 2 pollution. Aiming at these problems, we present a new method of sulfur-fixing roasting of antimony sulfide. This method uses ZnO as a sulfur-fixing agent, and roasting with Sb 2 S 3 was carried out at 673 K~1073 K to produce Sb 2 O 3 and ZnS. By calculating the thermodynamics of the reactions, we can conclude that the Gibbs Free Energy Change (ΔG θ ) of roasting reaction is below -60 kJ/mol and the predominance areas of Sb 2 O 3 and ZnS are wide and right shifting with the temperature increase, which all indicates that this method is theoretically feasible. The reacted products between Sb 2 S 3 and ZnO indicated that the reaction began at 773 K and finished approximately at 973K. We used the Ozawa-Flynn-Wall, Kissinger and Coats-Redfern method to calculate the kinetics of the roasting reaction. The conclusion is as follows: The average values of apparent activation energy (E) and natural logarithmic frequency factor (lnA) calculated by Ozawa-Flynn-Wall, Kissinger and Coats-Redfern were 189.72 kJ·mol -1 and 35.29 s -1 , respectively. The mechanism of this reaction was phase boundary reaction model . The kinetic equation is shown as follow, where α represents reaction fraction:

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“…Differential, Freeman Carroll (Freeman & Carroll, 1958) and Coats Redfern (Coats & Redfern, 1964) methods are some model fitting methods used for analysing nonisothermal pyrolysis kinetics. Jayaraman et al (2017) used the Coats Redfern method to analyse the kinetics of coal biomass blends and observed an increase in activation energy and pre-exponential constant when compared to coal itself. This was described by the higher activation energy value and pre-exponential factor of biomass.…”

Section: Introductionmentioning

confidence: 99%

Kissinger method: the sequential approach and DAEM for kinetic study of rubber and gliricidia wood

Perera

Narayana

2018

J. Natn. Sci. Foundation Sri Lanka

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This article is published under the Creative Commons CC-BY-ND License (http://creativecommons.org/licenses/by-nd/4.0/). This license permits use, distribution and reproduction, commercial and non-commercial, provided that the original work is properly cited and is not changed anyway.Abstract: Rubber and gliricidia are commonly used fuel wood types for industrial applications in Sri Lanka. The government has promoted the cultivation of gliricidia as an energy crop and rubber is generated as a forestry residue. A percentage of the thermal energy requirement in the industrial sector is fulfilled by fuel wood. Although these fuels are widely used in industry, scientific data related to their thermal decomposition is limited. These kinetic data are essential for the optimum usage of firewood and the design of biomass conversion systems. Kinetic parameters of pyrolysis are not available for rubber and gliricidia. Pyrolysis is a major step involved in thermal decomposition of biomass, and is an important process of deriving liquid and gaseous fuels for different applications. This study focused on the analysis of kinetic parameters of pyrolysis for rubber and gliricidia wood by sequential approach to Kissinger method and distributed activation energy model (DAEM).

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Thermogravimetric and mass spectrometric (TG-MS) analysis and kinetics of coal-biomass blends

Cited by 170 publications

References 26 publications

Investigation of the Thermal Improvement and the Kinetic Analysis of the Enriched Coal

Investigation of the Thermal Improvement and the Kinetic Analysis of the Enriched Coal

Thermodynamic and kinetics analysis of the sulfur-fixed roasting of antimony sulfide using ZnO as sulfur-fixing agent

Kissinger method: the sequential approach and DAEM for kinetic study of rubber and gliricidia wood

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