Review of experimental methods to determine spontaneous combustion susceptibility of coal – Indian context

Mohalik, N.K.; Lester, Edward; Lowndes, I.S.

doi:10.1080/17480930.2016.1232334

Cited by 37 publications

(23 citation statements)

References 146 publications

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“…The experiment ended when the coal temperature was higher than the surrounding programmed adiabatic oven and when the coal sample temperature equalled the linearly ramped oven temperature. This temperature is called the crossing point temperature (CPT) (Nugroho et al, 1998;Wang et al, 2009;Xuyao et al, 2011;Mohalik et al, 2016), as shown in Figure 2. (Kim, 1995) Rapidly accelerating oxidation as self-heating progresses…”

Section: Crossing Point Temperature (Cpt) Methodsmentioning

confidence: 99%

Examination of the role of moisture content on the spontaneous combustion of coal (SCC)

Saffari

Ataei

Sereshki

2019

MGPB

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The percentage of moisture content is one of coal's inherent characteristics, which has a crucial aspect in the occurrence of the spontaneous combustion of coal (SCC) and has long been an attractive issue for analysis among scientists. A complete understanding of this phenomenon helps experts in the prediction and prevention of its occurrence. For this reason, the present work predicts this phenomenon based on moisture content. Thus, a fi nal conclusion about the eff ect of this parameter was determined. Fifty-one coal samples with diff erent percentages of moisture content were collected from underground coal fi elds in Iran for the practice training and testing of crossing point temperature (CPT) and R70 test methods. Then, the method of regression analysis was used for modelling and predicting the SCC tendency. The results showed that coal samples were oxidized most rapidly when the moisture content supply was under 20%, and it can reduce the prevalence of the SCC in situations when the moisture was in excess of 20% because the heat released by oxidation is used to evaporate the moisture. For validation and testing, 13 coal samples of another coalfi eld were collected and CPT and R70 test methods were carried out. The results of the test methods were compared through regression equations. The results obtained from the models indicate a good appropriate prediction in terms of the determination of the SCC tendency by regression analysis.

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Section: Crossing Point Temperature (Cpt) Methodsmentioning

confidence: 99%

Examination of the role of moisture content on the spontaneous combustion of coal (SCC)

Saffari

Ataei

Sereshki

2019

MGPB

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“…Coal oxidation mechanisms that lead to self-ignition constitute a complicated process comprised of several characteristic stages widely discussed in the literature in terms of surface and underground coal fires in the coal mine. In [57], a critical review of the different techniques developed to investigate the susceptibility of coal to spontaneous combustion and fire is presented. In [58], the mechanism of self-heating, areas of spontaneous combustion, various factors influencing self-heating and different experimental studies to predict its occurrence are reviewed (in terms of the South African context).…”

Section: No Factor Category Type Of Factors Referencesmentioning

confidence: 99%

The Mechanisms of Endogenous Fires Occurring in Extractive Waste Dumping Facilities

et al. 2020

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The processes of hard coal extraction and processing are accompanied by the generation of a considerable amount of post-mining extractive waste, which in most cases is deposited on the ground surface. In the past, such waste was disposed of by deposition in bings and spoil piles of various kinds. The application of modern technologies makes it possible to recycle, reuse or reclaim extractive waste in engineering works or as a substitute of natural aggregates used for the construction of different kinds of banks and embankments. Regardless of whether the waste is deposited or reused, the basic target method of waste management consists of depositing it on the ground surface. This form of extractive waste management is always associated with the risk of the occurrence of coal self-heating phenomena, which may consequently lead to an endogenous fire. Therefore, it is of critical importance to apply appropriate technologies for the construction of coal waste embankments on the one hand, and on the other hand to recognize the mechanisms responsible for the occurrence of fires in extractive waste dumps, which constitutes the subject matter of this paper.

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“…In major coal producing countries, such as China, the United States, Australia and India, coal fire disasters are very common and are considered as a global disaster problem (Havva, 2007;James et al, 2009;Kong et al, 2017;Mohalik et al, 2017;Parsa et al, 2017;Wang et al, 2018;Yang and Qiu, 2019). More than 95% of Chinese collieries perform underground coal mining, in which fire accidents due to spontaneous coal combustion account for more than 90% of the total number of mine fires (Deng et al, 2008;Fan et al, 2020Fan et al, , 2019.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on controlled-release inhibitor foam for restraining spontaneous combustion of coal

Zhang

Yang

Xie³

et al. 2020

Energy Exploration & Exploitation

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A new method is proposed based on temperature-controlled self-reaction to generate and release inhibitors in the form of foam at a specific temperature, which can overcome the disadvantages of short effective time and low efficiency in the inhibition of the spontaneous combustion of coal when inhibitors are released in advance, and greatly increase the action range of inhibitor through foam diffusion. The proposed temperature-controlled foaming system was prepared with hollow spheres as solution carriers, NaHCO3 and acetic acid as basic reactants, reaction-generated CO2 as foaming gas, sodium dodecyl sulfate and sodium carboxymethyl cellulose as foaming additives, NaCl, MgCl2 and CaCl2 as additives to enhance inhibition effect, and temperature sensitive paraffin as insulating material to generate and release inhibitor foam. The effects of releasing foam on restraining the spontaneous combustion of coal were studied based on the experimental analysis of the optimum ratio of reactants and additives, hollow sphere parameters, released temperature of the foam and variation rule of CO generated by coal oxidation. The obtained results showed that the released temperature of foam was 59–61°C and the covered area of pulverized coal by inhibitor foam was 12.9–13.9 times higher than when it was directly wetted by inhibitor solution. The total effects of inhibition and inerting were achieved after pulverized coal was wetted with inhibitor foam and the efficiency of restraining the spontaneous combustion of coal reached 88.51–97.06% when temperature was increased to 160°C.

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Review of experimental methods to determine spontaneous combustion susceptibility of coal – Indian context

Cited by 37 publications

References 146 publications

Examination of the role of moisture content on the spontaneous combustion of coal (SCC)

Examination of the role of moisture content on the spontaneous combustion of coal (SCC)

The Mechanisms of Endogenous Fires Occurring in Extractive Waste Dumping Facilities

Experimental study on controlled-release inhibitor foam for restraining spontaneous combustion of coal

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