A thermal analysis study of the pyrolysis of Victorian brown coal

Ma, S.; Hill, J.O.; Heng, S.

doi:10.1007/bf02057254

Cited by 10 publications

(6 citation statements)

References 7 publications

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“…Studies on the thermal analysis of Victorian brown coal to determine pyrolysis and combustion kinetics can be found in the open literature [14][15][16][17][18][19]. However, very few studies reported provided information on the gasification kinetics of Victorian brown coals; those available were summarised by Bhattacharya et al [20].…”

Section: Introductionmentioning

confidence: 99%

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Kabir

Tahmasebi

Bhattacharya

et al. 2015

J Therm Anal Calorim

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CO 2 gasification of Victorian (Morwell) brown coal char was studied using a thermogravimetric analyser (TG). Gasification kinetics of demineralised, Ca-loaded, and Fe-loaded Morwell char were also studied. The grain model and random pore model were used to fit the gasification data. The random pore model fitted the experimental data better than the grain model. The activation energy was 189.05 kJ mol -1 for the CO 2 gasification of Morwell coal char. With 2 % Ca loading, the activation energy increased to 204.53 kJ mol -1 due to lowering of the surface area. However, an order of magnitude increase in the pre-exponential factor indicated an increase in active reaction sites for the 2 % Ca-loaded sample, resulting in a net increase in gasification rate. 5 % Ca loading and 2 % Fe loading proved to be less effective in increasing the gasification rate. Analysis of the TG outlet gas also proved the effectiveness of 2 % Ca loading as a gasification catalyst.

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Section: Introductionmentioning

confidence: 99%

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Kabir

Tahmasebi

Bhattacharya

et al. 2015

J Therm Anal Calorim

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“…Both thermogravimetric analysis (TGA) and differential thermal analysis (DTA) have been applied to determine the degradation kinetics of neat polyesters and polycarbonate [24, 25]. Generally, TG is the preferred technique for such determinations, because the relevant mass changes are easier to measure than the associated heat effects [26]. Few methods are cited in the literature for the study of solid thermal decomposition kinetics.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition kinetics of tricomponent polyester/polycarbonate systems

Al‐Mulla

Mathew

Al-Omairi

et al. 2011

Polymer Engineering & Sci

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The current work seeks to develop a novel polymeric blend containing polycarbonate(PC)/poly(trimethylene‐terephthalate)(PTT)/poly(butylene‐terephthalate)(PBT), (50: 25:25, weight/weight percent). This has been prepared using a single screw extruder. The thermal degradation kinetics of the blend and neat polymers have been investigated by means of a Theromogravimetric analyzer (TGA) machine. Theromogravimetric analysis of the neat polymers and the blend was carried out at 5, 10, 15, and 20°C/min under Nitrogen and air atmosphere. Two analytical models, namely Kissinger and Ozawa were used to estimate the degradation kinetic parameters (Activation energy, E and pre‐exponential factor, A). The neat polymers were found to be more thermally stable under nitrogen than under air. The solid state decomposition was found to follow a phase boundary controlled mechanism. Possibility of transexchange reactions during melt blending was also analyzed using TGA studies. Residual char of blends of different compositions were also used as an indicator to determine possible exchange reactions. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers.

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“…The improvement in LHV at 200 °C is mainly due to the removal of moisture in lignite, which implies that LHV decreases during the moisture readsorption process, consequently weakening the upgrading effect . The improvement in LHV at the temperature higher than 200 °C resulted from the release of volatile matter, decomposition of functional groups, and depolymerization reactions. , …”

Section: Resultsmentioning

confidence: 99%

“…For all experiments, About 5 mg of sample was heated at a rate of 10 °C/min over a temperature range of ambient to 900 °C with an air flow rate of 100 mL/min. Many parameters related to the coal combustion behavior can be derived from the TG–DTG curves. − The ignition temperature ( T ig ) is the most relevant index for lignite because of its high intensity of spontaneous combustion. In general, those coals with a lower ignition temperature are considered as easier to burn. , The maximum combustion rate ( R max ), obtained from DTG peaks, indicates the combustion intensity of coal …”

Section: Methodsmentioning

confidence: 99%

Evaluation of Moisture Readsorption and Combustion Characteristics of a Lignite Thermally Upgraded with the Addition of Asphalt

Zhang

Qiu

et al. 2014

Energy Fuels

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Thermal upgrading is a promising way to use lignite efficiently and safely. However, moisture readsorption properties of the upgraded lignite would partially offset the upgrading effect. Asphalt is so repellent that it could be used as an additive in lignite thermal upgrading to prevent moisture readsorption of upgraded lignite. In this study, a Chinese lignite upgraded at various temperatures (200−500 °C) with various concentrations of asphalt addition (0−10 wt %) was thoroughly investigated. The changes in chemical structures of the upgraded lignites were investigated using Fourier transform infrared spectroscopy (FTIR). The changes in physical structures were analyzed by N 2 adsorption isotherm and scanning electron microscopy (SEM). The moisture readsorption and combustion characteristics of the upgraded lignites were studied using a constant temperature/humidity chamber and a thermogravimetric analyer (TGA), respectively. The results indicate that the abundance of oxygen-containing groups (i.e., hydroxyl and carboxyl) decreased with the increasing upgrading temperature, while it was not significantly influenced by the addition of asphalt. The pore volume and surface area of the upgraded lignites increased with the increasing temperature, while the pore diameter decreased. SEM images revealed that some pores in upgraded lignites were covered by asphalt and the surface became much smoother with the increasing asphalt concentration, which resulted in the decrease of the pore volume and surface area. The moisture readsorption ratio and spontaneous combustion tendency to the upgraded lignites decreased with the increasing temperature, while the influence of asphalt on the moisture readsorption and combustion characteristics was temperature-dependent.

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A thermal analysis study of the pyrolysis of Victorian brown coal

Cited by 10 publications

References 7 publications

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Intrinsic kinetics of CO2 gasification of a Victorian coal char

Thermal decomposition kinetics of tricomponent polyester/polycarbonate systems

Evaluation of Moisture Readsorption and Combustion Characteristics of a Lignite Thermally Upgraded with the Addition of Asphalt

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