Influence of coal quality on combustion behaviour and mineral phases transformations

Mishra, Vivek; Bhowmick, Trisrota; Chakravarty, Sanchita; Varma, Atul Kumar; Sharma, Mamta

doi:10.1016/j.fuel.2016.08.092

Cited by 32 publications

(17 citation statements)

References 60 publications

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“…The present paper entails an initial examination of the surface morphology of maceral and their relationship with the mineral matter in some coal samples collected from Ib river valley, Mahanadi basin, Odisha and Umaria coalfield, Madhya Pradesh. Some recent contributions on coal deposits of the Mahanadi valley have been made by Singh et al 2013, Naik et al 2016and Mishra et al 2016a. Nevertheless, the present study carried out under SEM and XRD would help in identifying their potential utilisation.…”

Section: Introductionmentioning

confidence: 78%

“…The XRD patterns of both coals are found to show almost similar mineral composition. The identification of minor minerals only by XRD in a multi component system like coal is difficult due to the detection limits (normally at about 0.5%-1%) and peak overlapping (Mishra et al 2016a). Figures 3 and 4, shows the SEM photographs of the various maceral of the Umaria and Ib valley coals.…”

Section: Resultsmentioning

confidence: 99%

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Microstructural relation of macerals with mineral matter in coals from Ib valley and Umaria, Son-Mahanadi basin, India

Mishra

Singh

2017

Int J Coal Sci Technol

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Coal petrology provides significant inputs for the industrial utilisation of coal and for broad understanding the coal formation and diagenesis. The present paper entails the results of the investigations carried out on the selected coal samples, from Ib valley and Umaria coalfield, using scanning electron microscope (SEM) and X-ray diffraction (XRD) to study the surface microstructures and minerals present in them and the relationship of the finely dispersed mineral matter with the organic constituents. This would further help in evaluating the distribution and chemical character of the mineral matter occurring within the maceral types. Ib valley and Umaria coals are typical Indian (Lower Gondwana) non-coking coals and only scanty data is available on SEM study of these coals. Under SEM examination, it manifests that, the mineral matters of these coal occur as deep intergrowth, massive impregnation, superficial mounting, filling and depletion of micropores, mechanical cavity filling and fusinitic cavity filling.

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Section: Introductionmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Microstructural relation of macerals with mineral matter in coals from Ib valley and Umaria, Son-Mahanadi basin, India

Mishra

Singh

2017

Int J Coal Sci Technol

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“…Higher contents of alkalis (K 2 O and Na 2 O) in smallersize microspheres are probably related to their melting point. As is well known, K 2 O and Na 2 O lower the melting point; components such as Fe 2 O 3 and MgO lower it slightly, whereas SiO 2 and Al 2 O 3 increase its value (Vassilev et al 1995;Jing et al 2012;Drzymała et al 2014;Mishra et al 2016). Therefore, mineral components containing alkalis will melt faster than the components without them.…”

Section: Microanalysis Of the Chemical Composition Of Cenospheres (Sem)mentioning

confidence: 96%

Influence of chemical composition of fly-ash cenospheres on their grains size

Strzałkowska

Adamczyk

2019

Int. J. Environ. Sci. Technol.

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Cenospheres, which are the by-product of hard coal combustion, are characterized by properties allowing for a broad use of this material. The article presents the results of the chemical composition analysis of the cenospheres obtained from various power plants. It has been exhibited that depending on the place of origin, their chemical composition is similar and comparable to fly ash produced in hard coal combustion. A great majority of analysed cenospheres may be classified similarly as the sialic ashes-slightly acidic. The analysis of dependence of refractoriness of the cenospheres on their chemical composition confirmed the correlation between this parameter and the content of SiO 2 and Al 2 O 3. At the same time, the content of each of the chemical components indicates a correlation with the size of the cenospheres. A trend of SiO 2 /Al 2 O 3 ratio decreasing along with the increasing size of the cenospheres has been noted. Also the content of K 2 O and-to a lesser extent-Na 2 O decreases along with increasing diameter of grains. An inverse correlation was noted in case of Fe 2 O 3. The higher the diameter of the grains, the higher the content of this component. In view of the obtained results, it should be assumed that the division of cenospheres into grain-size classes before further industrial use could extent the current range of use of this material.

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“…The natural features of hard coal, determined by the properties of the deposit, also include: calorific value, sulfur content, and ash content. The mentioned features determine the quality of hard coal; thus, they have a direct impact on the possibility of the disposal of the raw material [57][58][59]. In recent years, their importance in the development of hard coal mines has increased due to the increasing environmental restrictions and growing requirements of the energy and heating sectors.…”

Section: Geological and Mining Areamentioning

confidence: 99%

Method for Assessing the Development of Underground Hard Coal Mines on a Regional Basis: The Concept of Measurement and Research Results

Jonek-Kowalska

2018

Energies

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The functioning and development of the extractive industry depends on many unusual conditions that are not found in other industries, such as the size of deposits, the level of natural and technical hazards, geographic location, or the method of mineral extraction (open pit or underground). Therefore, it is difficult to use universal development assessment methods for such specific production units. As a result, the research undertaken in this article aims to develop an indicator method for evaluating the development potential of underground hard coal mines. This method is based on a theoretical and practical analysis of the conditions of functioning of hard coal mines, expert research, and multiple case studies verifying the operation of the presented development indicator. The first part of the article is devoted to identifying and analyzing the criteria for assessing the functioning of underground hard coal mines. Next, the essence and methodology of creating and interpreting the proposed indicator was presented. The second part of the article is empirical, and contains the results of the assessment carried out using the developed indicators for five Polish hard coal mines for the years 2011-2015. The results of the research indicate that the most important factors in the development of hard coal mines relate to the geological and mining conditions, and those concerning natural hazard levels. However, during the functioning, the financial conditions and related production conditions, which ultimately determine the survival and development of underground mining plants, gain in significance.

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Influence of coal quality on combustion behaviour and mineral phases transformations

Cited by 32 publications

References 60 publications

Microstructural relation of macerals with mineral matter in coals from Ib valley and Umaria, Son-Mahanadi basin, India

Microstructural relation of macerals with mineral matter in coals from Ib valley and Umaria, Son-Mahanadi basin, India

Influence of chemical composition of fly-ash cenospheres on their grains size

Method for Assessing the Development of Underground Hard Coal Mines on a Regional Basis: The Concept of Measurement and Research Results

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