A thermal analysis study of the combustion characteristics of Victorian brown coals

Abstract

Simultaneous TG, DTA techniques have been applied to investigate the combustion characteristics of Victorian brown coal derived from different coal fields and including various l!thotypes. TG and DTA profiles of the entire combustion process were obtained to provide a set ofpardmeters which characterize the oxidation potential of these coal samples. These parameters can also be used to predict the combustion performance of pulverized coal in industrial furnaces. The area of the major DTA combustion peak is closely related to the heat released during the combustion process and therefore provides a means of determining the specific energy of the coal. Different lithotypes are also characterized by their corresponding TG and DTA burning profiles.Thermal analysis techniques have been widely used in the study of coal combustion. It is known that for a range of fuels which have similar TG burning profiles, their performance in an industrial pulverized coal furnace is similar [1]. Thermal analysis data can be applied not only to the characterization of different Coals, but also to the evaluation of combustion performance at high temperatures and heating rates. Since only a small sample size is required in the analysis, the burning profile is most useful for evaluating the burning properties of fuel when only small samples are available or when it is impractical to test-fire large quantities of fuel in existing installations [2].In the present work the combustion performance of some brown coal samples and lithotypes of brown coat is investigated by simultaneous TG and DTA techniques.John Wiley & Sons, Limited, Chichester dkad~miai Kiadr~ Budapest

Intrinsic kinetics of CO2 gasification of a Victorian coal char

“…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].…”

Physicochemical properties of hydrothermally treated peat fuel obtained from Mempawah-West Kalimantan: influence of hydrophilicity index on carbon aromaticity and combustibility

“…The first and second DTA peaks appearing at around 60°C (endothermic) and 285°C are due to the vaporization of moisture and combustion of volatile matter, respectively [12]. However, the third peak (exothermic) is at 460°C to 509°C representing the combustion of char [9]. Table 1 shows the effect of temperature on combustion parameters based on the DTA-TG analysis.…”

“…4. From the DTA-TG curves, a number of combustion parameters can be derived, such as, ignition temperature (T ig ), maximum combustion rate temperature (T max ), maximum combustion rate (R max ) and char burn-out temperature (T bo ) [9][10][11]. Ignition temperature (T ig ) is an important characteristic of peat fuel combustion, especially for raw peat due to its high intensity of spontaneous combustion [4].…”

Characterization of Upgraded Brown Coal (Ubc)

“…The decreases of differential temperature at the first DTA peak for the raw coal corresponds to the consumption of heat for the removal of moisture. The second peak relates to the heat released and the heat consumption as a result of the decomposition, the poly condensation of pyrolysis product and the combustion of volatile matter [10]. A hydrogen bond is disrupted during the upgrading and takes place in the low rank coal.…”