Thermochemistry of coal oxidation

Matyjaszczyk, Maciej S.; Przeliorz, R.

doi:10.1016/0040-6031(85)80019-8

Cited by 12 publications

(9 citation statements)

References 10 publications

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“…However, for all the brown coal samples investigated, no obvious mass gain was observed during the combustion process and this is due to the release of volatile matter, which masked the sorption of oxygen [4].…”

Section: Oxidation Of Brown Coals From Different Coalfieldsmentioning

confidence: 70%

“…Usually, for a higher rank coal, there is an observed mass gain during the low temperature oxidation process which is related to oxygen adsorption on the coal surlhce [3][4][5][6]. However, for all the brown coal samples investigated, no obvious mass gain was observed during the combustion process and this is due to the release of volatile matter, which masked the sorption of oxygen [4].…”

Section: Oxidation Of Brown Coals From Different Coalfieldsmentioning

confidence: 97%

“…The first stage from T 1 to T 2 is exothermic, which corresponds to the commencement of the thermal decomposition of volatile organic components. The decrease in differential temperature, which follows with an apparent minimum at T 3, is the result of decomposition, polycondensation of pyrolysis products and phase transformations associated with the removal of volatile matter [4,8]. The third stage from T 3 to T4 is characterized by a rapid increase of the differential temperature to a maximum Temperature, ~ Temperature,*C point, resulting from the combuston of the residual char after the volatile matter has been removed.…”

Section: Oxidation Of Brown Coals From Different Coalfieldsmentioning

confidence: 98%

“…Since the burning profile of brown coal gives two or more DTA peaks, the ignition of volatile matter and char occurs at different temperatures. This has been commonly referred to as "false ignition" [4], which infers that the coal may ignite at the ignition temperature given by the first DTA peak; however the coal would not necessarily burn out unless the temperature is further increased to effect ignition of the char itself. Ignition temperature, as given in present work, corresponds to the Ti.9 of the volatile matter.…”

Section: Oxidation Of Brown Coals From Different Coalfieldsmentioning

confidence: 99%

“…The DTA curve shown in Fig. 3 may be divided into five parts, corresponding to five stages of oxidation [4,7]. The first stage from T 1 to T 2 is exothermic, which corresponds to the commencement of the thermal decomposition of volatile organic components.…”

Section: Oxidation Of Brown Coals From Different Coalfieldsmentioning

confidence: 99%

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

Hill

Heng

1989

Journal of Thermal Analysis

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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

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Section: Oxidation Of Brown Coals From Different Coalfieldsmentioning

confidence: 70%

Section: Oxidation Of Brown Coals From Different Coalfieldsmentioning

confidence: 97%

Section: Oxidation Of Brown Coals From Different Coalfieldsmentioning

confidence: 98%

Section: Oxidation Of Brown Coals From Different Coalfieldsmentioning

confidence: 99%

Section: Oxidation Of Brown Coals From Different Coalfieldsmentioning

confidence: 99%

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

Hill

Heng

1989

Journal of Thermal Analysis

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The application of thermal analysis to the study of the oxidation of solid fuels

Markova

Rustschev

1991

Journal of Thermal Analysis

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Thermal analysis and associated coupled techniques have been broadly applied in the last years for studying interaction of different kinds of solid fuels (peat, lignit, brown and bituminous coals, antraeite, bitominous shales and etc.) with air, with other gas, liquid and hard oxidizers. References showed that these analysis were important not only theoretical but practical point of view. Intoduction

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