Influence of specific surface area on coal dust explosibility using the 20-L chamber

Zlochower, Isaac A.; Sapko, Michael J.; Perera, Inoka E.; Brown, Connor B.; Harris, Marcia L.; Rayyan, Naseem S.

doi:10.1016/j.jlp.2018.03.004

Cited by 25 publications

(5 citation statements)

References 12 publications

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“…Coal dust explosion is mainly affected by coal rank, − particle size, − specific surface area, − moisture content, − volatile content, − and the concentration. − Given constant dust concentration and particle size, the explosion pressure increases with the increase of organic matter content . The higher the volatile content, the greater the explosion intensity of the dust, and the explosion pressure increases significantly faster with the decrease of particle size because the existence of fine particles greatly increases the total effective surface area and volatilization rate of dust, accelerating the dust explosion process .…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Dust in Coal Mines in Central North China and Its Research Significance

Ding

Zhuang

2020

ACS Omega

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The identification of the dust characteristics in coal mine working faces is essential for preventing coal dust explosion and occupational diseases. In this paper, dust samples from the coal mines in southern Shanxi province and Henan province, central North China, were selected as the research objects. The results show that the dust contains primarily organic matter, as well as considerable amounts of minerals. The chemical composition of dust at the working faces is the most complex. According to the proportion of PM10, the dust composition can be divided into three types: symmetrical, fine-dominated, and coarse-dominated. The wettability of dust increases with the increase of the oxygen–carbon ratio on its surface, increase of ash content, decrease of fixed carbon content, and decrease of particle size. In addition, the great variety of harmful elements in dust, some with a high content, can harm the human body. An explosion index is proposed to evaluate the likeliness tendency of coal dust explosion based on several key affecting factors. The surfactant (0.05% AN solution) adopted in this paper can significantly increase the wettability of coal dust and inhibit the generation of dust greatly, showing good ability in preventing coal dust explosion and occupational diseases.

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Section: Introductionmentioning

confidence: 99%

Characteristics of Dust in Coal Mines in Central North China and Its Research Significance

Ding

Zhuang

2020

ACS Omega

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“…It is possible to prevent coal spontaneous combustion by its strengthening with solidifying solutions featuring high adhesion, stability to high/low temperature, outside environment and rockslides. [5,10,15,30,32] In this case, it was possible to attain the decrease in the susceptibility to spontaneous combustion for the coal treated with such solutions due to increase of the coal block strength and stability, formation of predominantly coarse fractions during its destruction and decreasing coal sorption capacity. Neutral metals could prevent oxidation processes.…”

Section: Surveying a New Way To Fight Man-induced Fires At Korkinsmentioning

confidence: 99%

“…Air pressure in the confined area, which is in equilibrium with initial pressure in the open area, tends to equalize the resulting difference. At the same time, coal oxidation products pass via cracks in rocks [9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Korkinsk Brown Coal Open Pit as a Case Study of Endogenous Fires

Argimbaev

Drebenstedt

2021

IJE

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Abrupt termination of the coal open pit operation is complicated in many cases by endogenous fires that not only cause significant damage to property but also worsen sanitation and hygienic conditions for human life in nearby settlements, as well as those for fauna and flora. T herefore, the purpose of the research was to prevent endogenous fires at Korkinsk brown coal open pit. In this connection, we used an analytical method to process the statistical data obtained from observations. The laboratory method included the study of coal samples for moisture exchange intensity by creating conditions with relative humidity up to 97 %, temperature up to plus 50°С and air speed up to 0.5 l/minute. Dependencies were determined for fire occurrence frequency, relative humidity, and average temperature of the air upon the time of day, the intensity of moisture evaporation and initial coal humidity on equilibrium co al humidity as well as the intensity of moisture absorption and equilibrium coal humidity upon initial humidity in different temperature periods. An environmentally friendly solution was created that featured good adhesion to the materials being coated, fire and explosion resistance. T he results obtained make it possible to understand the causes and methods of fighting endogenous fires.

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“…Conversely, particle sizing method assumes the particles as smooth, spherical and nonporous. Therefore, the specific surface area measured by gas adsorption (BET method) is greater than that measured by the laser diffraction instruments (Zlochower et al, 2018).…”

Section: Introductionmentioning

confidence: 95%

Physico-chemical characteristics of pulverized coals and their interrelations—a spontaneous combustion and explosion perspective

Mishra

2021

Environ Sci Pollut Res

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Characteristics of pulverized coals have significant influence on the spontaneous combustion and explosion processes. This paper presents an experimental and theoretical framework on physico-chemical characteristics of coal and analyzes their interrelations from spontaneous combustion and explosion perspectives. The chemical properties, morphology, bulk density, particle size and specific surface area of pulverized coals from nine different coal subsidiaries of India are vividly investigated in five distinct sizes. Moreover, the effects of particle size on bulk density, specific surface area and N2 adsorption capacity of pulverized coals are critically analyzed. The micrographs revealed that the coal particles are mostly irregular in shape with angular outlines and sharp edges.With decrease in particle size, the bulk density of pulverized coals decreased and the specific surface area and N2 adsorption capacity increased. The relationships of bulk density and specific surface area of pulverized coals with particle size are established. Moreover, the specific surface areas determined by both the particle sizing and BET methods are compared and correlation factors between them are determined. This study led to the generation of insightful coal characteristic data which can be used as reference material for furthering researches on spontaneous combustion and explosion involving pulverized coals.

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Influence of specific surface area on coal dust explosibility using the 20-L chamber

Cited by 25 publications

References 12 publications

Characteristics of Dust in Coal Mines in Central North China and Its Research Significance

Characteristics of Dust in Coal Mines in Central North China and Its Research Significance

Korkinsk Brown Coal Open Pit as a Case Study of Endogenous Fires

Physico-chemical characteristics of pulverized coals and their interrelations—a spontaneous combustion and explosion perspective

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