Spontaneous-combustion propensity of New Zealand coals under adiabatic conditions

Beamish, B. B.; Barakat, M. A.; George, John

doi:10.1016/s0166-5162(00)00034-3

Cited by 132 publications

(54 citation statements)

References 11 publications

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“…The inconsistencies in the trend of correlation coefficients necessitated the developed models (Table 8). It is known that different methods have been used by previous studies to measure the spontaneous combustion liability of coals but no standard method has been considered the best in predicting spontaneous combustion liability (Stott 1980;Wade et al 1987;Cliff et al 1998;Beamish et al 2001). This study investigated the factors affecting spontaneous combustion liability of coals and coal-shales using two different spontaneous combustion test methods (the Wits-Ehac Index and the Wits-CT Index) and evaluates the factor affecting these materials using statistical analysis.…”

Section: Effects Of Intrinsic Properties On Spontaneous Combustion Ofmentioning

confidence: 99%

Modelling spontaneous combustion liability of carbonaceous materials

Onifade

Genc

2018

Int J Coal Sci Technol

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This paper presents predictive models to determine spontaneous combustion liability of carbonaceous materials (coals and coal-shales) using statistical analysis. The intrinsic properties and spontaneous combustion liability index were determined by testing 14 coals and 14 coal-shales from Witbank coalfields, South Africa. The relationship between these intrinsic properties (obtained from proximate, ultimate and petrographic analysis) and spontaneous combustion liability indices (the Wits-Ehac Index and Wits-CT Index) were established. The influence of the intrinsic properties of coal-shales in relation to coal properties affecting spontaneous combustion has been established using a statistical method. The linear regression analysis indicates better linear relationships between some of the selected intrinsic properties and spontaneous combustion liability index and thus, identifies the major intrinsic factors affecting their liability toward spontaneous combustion. It was found that a definite positive or negative correlation coefficient exists between the intrinsic factors and spontaneous combustion liability. A set of models to predict the spontaneous combustion liability was derived. The best significant correlation along with the most appropriate model as indicated by R-squared values, the coefficient of correlations and standard error was used to predict the incident of spontaneous combustion.

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Section: Effects Of Intrinsic Properties On Spontaneous Combustion Ofmentioning

confidence: 99%

Modelling spontaneous combustion liability of carbonaceous materials

Onifade

Genc

2018

Int J Coal Sci Technol

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“…Falcon (1986) and Misra and Singh (1994) also considered open-structure fusinite to be a factor owing to the enhanced surface area. Beamish et al (2001), Beamish and Blazak (2005), Beamish and Hamilton (2005), and correlated R 70 , the average rate of temperature rise from 40°C to 70°C in an adiabatic oven with O 2 flow of 50 mL/min, with a number of properties for New Zealand and Australian coals. Beamish and Blazak (2005) and Beamish and Hamilton (2005) found R 70 to decrease with an increase in mineral matter, with the mineral matter acting as a heat sink, and an increase in the moisture content.…”

Section: Coal Petrology and Spontaneous Combustionmentioning

confidence: 99%

“…Beamish and Blazak (2005) and Beamish and Hamilton (2005) found R 70 to decrease with an increase in mineral matter, with the mineral matter acting as a heat sink, and an increase in the moisture content. Subbituminous coals have the highest self-heating rate (Beamish et al, 2001;. In general, it has been widely recognized that lower rank coals are more susceptible to spontaneous combustion than higher rank coals because they have high percent of reactive macerals (vitrinite and liptinite).…”

Section: Coal Petrology and Spontaneous Combustionmentioning

confidence: 99%

Spontaneous Combustion and Coal Petrology

Mastalerz¹,

Drobniak²,

Hower³

et al. 2011

Coal and Peat Fires: A Global Perspective

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“…The results of the conducted experiments show that, after grinding in the disintegrator and some time holding, deactivation is possible a decrease in the reactivity of coal dust. It is known that the preliminary oxidation reduces the reactivity of coal [5]. The lower activity of aged coal is explained by the disappearance of active oxidation centers.…”

Section: Vertical Furnace Tubementioning

confidence: 99%

Research of the chemical activity of microgrinding coals of various metamorphism degree

Burdukov

Butakov

Кузнецов

2017

J. Phys.: Conf. Ser.

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Abstract. In this paper, we investigate the effect of mechanically activating grinding of coals of various degrees of metamorphism by two different methods -determination of the flash time in a vertical tubular furnace and thermogravimetric analysis. In the experiments, the coals that had been processed on a vibrating centrifugal mill and a disintegrator, aged for some time, were compared. The experiments showed a decrease in the ignition temperature of mechanically activated coals -deactivation of fuel, as well as the effect of mechanical activation on the further process of thermal-oxidative degradation. IntroductionCoal is one of the most important energy sources in the world. According to forecasts, by 2020, the share of coal in the global energy sector will reach 50%, primarily due to the very likely reduction in oil and gas consumption, as well as the revision of the policy on the development of nuclear energy [1].At present, most coal-fired power plants operate using petroleum products to start and color the boiler during operation. The cost of these petroleum products significantly exceeds the cost of the coal itself, and therefore the introduction of new technologies that allow to exclude petroleum products from the energy processes that take place at the CHPP (Central Heating and Power Plant) is topical [2,3]. One of such technologies is the technology of mechanical activation of microgrinding coal obtained at mills-disintegrators. In this paper, coal studies are conducted using two different methods: determination of the self-ignition temperature of coals in a vertical tubular furnace and thermogravimetric analysis because the first method allows you to observe the processes of ignition of coal, and the results of the second one can conclude about the further process of thermal decomposition of coal.

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Spontaneous-combustion propensity of New Zealand coals under adiabatic conditions

Cited by 132 publications

References 11 publications

Modelling spontaneous combustion liability of carbonaceous materials

Modelling spontaneous combustion liability of carbonaceous materials

Spontaneous Combustion and Coal Petrology

Research of the chemical activity of microgrinding coals of various metamorphism degree

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