Study on the Effect of Polysulfide Content on the Micromorphology and Spontaneous Combustion Characteristics of Coal

This paper aimed to study the effect of the polysulfide content on the micromorphology and spontaneous combustion characteristics of coal, in order to develop more targeted prevention and treatment strategies. To this end, this study selected the method of mixing different sulfides with very low sulfur content raw coal to prepare the coal samples to be tested. Various parameters, such as true density, porosity, micromorphology, and oxygen uptake of the different sulfur samples, were tested. The results reveal that sulfide had a certain expansion effect on the coal body and improved the pore structure of coal, and the porosity increased with the increase of the sulfur content. After adding iron (II) disulfide (FeS2) and iron (II) sulfide (FeS) powder to the original coal sample, the number of fine particles on the surface increased significantly. After increasing the oxidation temperature, the lamellar structure disintegrated, and the massive coal body was broken into several fine particles, which promoted the spontaneous combustion of coal. Polysulfide promotes the low-temperature oxygen absorption of coal and shortens the natural firing period of coal. FeS has a slightly greater effect on increasing the tendency of coal to spontaneously combust and shortening the shortest natural firing period of coal. Before the addition of FeS2 and FeS to the coal samples, the coal production amount was not much different below 80–90°C, and then, the gap gradually widened. Under the same temperature condition of coal, carbon monoxide (CO) production basically occurred first as the sulfur content increased. When FeS2 and FeS were added, the sulfur content of the coal samples was 3 and 4%, respectively, and the production of CO and ethene (C2H4) was the largest. Although the peak areas of aliphatic hydrocarbon, aromatic hydrocarbon, hydroxyl group, and carbonyl group in the coal samples with FeS were different, they all reached their maximum value when the sulfur content was 4%.

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Study on Spontaneous Combustion Characteristics of Coal Samples with Different Pre-oxidized Temperatures in Secondary Oxidation Process

Combustion Science and Technology ◽

10.1080/00102202.2021.2004405 ◽

2021 ◽

pp. 1-14

Author(s):

Huiyong Niu ◽

Yanxiao Yang ◽

Yunchuan Bu ◽

Shuopeng Li

Keyword(s):

Spontaneous Combustion ◽

Oxidation Process ◽

Combustion Characteristics ◽

Secondary Oxidation

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Investigation of the qualities of some promising oils of the Absheron oil and gas region

World of OIL Products the Oil Companies Bulletin ◽

10.32758/2071-5951-2021-0-2-22-26 ◽

2021 ◽

Vol 02 ◽

pp. 22-26

Author(s):

Yu.A. Abdulayeva ◽

◽

N.H. Alekperova ◽

S.B. Logmanova ◽

N.F. Kafarova ◽

...

Keyword(s):

Sulfur Content ◽

Oil And Gas ◽

Viscosity Index ◽

Hydrocarbon Composition ◽

High Viscosity ◽

Group I ◽

Oil Fractions ◽

Low Sulfur Content ◽

Selective Refining ◽

Low Sulfur

The article presents the characteristics of characteristic oils of the Apsheron oil and gas region, as well as the hydrocarbon composition of light and oil fractions. Oils of the Apsheron oil and gas region in terms of light fractions, sulfur content, and density are comparable to marketing grades of oils. The standards for prices are: graded crude oil WTI, Light Sweet, Brent, and Russian oils Sokol, Urals, Siberian Light are approaching them. We have studied in detail the yields and hydrocarbon composition of light and oil fractions of oils from the Apsheron oil and gas region. To obtain oils with a high viscosity index, studies were carried out to change the structure of oil fractions using hydrogen using the example of oil fractions of Azeri oil. Due to the significant content of aromatic hydrocarbons, schemes for the processing of oil fractions have been developed, including selective purification of distillates, dewaxing (except for Guneshli oil), as well as hydrocatalytic treatment in a severe mode in the presence of industrial Russian catalysts. As a result, it was possible to obtain API group I oils, according to the viscosity classification corresponding to SAE 20 and SAE 30. Thus, a study of the qualities and hydrocarbon composition of oils from the Absheron oil and gas region showed that these oils are characterized by a high content of light fractions, low density, and low sulfur content. According to these indicators, these oils correspond to the marker oils. In order to obtain base oils with a viscosity index of ≥90 and an aromatic hydrocarbon content of ≥10, a traditional refining method was used: selective refining, dewaxing, and severe hydrotreating.

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The Effect of Moisture in Air on the Spontaneous Combustion Characteristics of Coal

Proceedings of the 11th International Mine Ventilation Congress ◽

10.1007/978-981-13-1420-9_44 ◽

2018 ◽

pp. 518-527

Author(s):

Ma Dong ◽

Qin Botao

Keyword(s):

Spontaneous Combustion ◽

Combustion Characteristics ◽

Effect Of Moisture

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Study on Coal Spontaneous Combustion Characteristics under Methane-Containing Atmosphere

Combustion Science and Technology ◽

10.1080/00102202.2018.1531286 ◽

2018 ◽

Vol 191 (8) ◽

pp. 1456-1472 ◽

Cited By ~ 5

Author(s):

Li Ma ◽

Ruizhi Guo ◽

Yu Gao ◽

Lifeng Ren ◽

Gaoming Wei ◽

...

Keyword(s):

Spontaneous Combustion ◽

Combustion Characteristics ◽

Coal Spontaneous Combustion

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Effects of organic sulfur on oxidation spontaneous combustion characteristics of coking coal

Energy Exploration & Exploitation ◽

10.1177/01445987211049045 ◽

2021 ◽

pp. 014459872110490

Author(s):

Fei Gao ◽

Zhe Jia ◽

Mei-ling Qin ◽

Xiao-gang Mu ◽

Yi-fei Teng ◽

...

Keyword(s):

Sulfur Content ◽

Photoelectron Spectroscopy ◽

Spontaneous Combustion ◽

Characteristic Temperature ◽

Combustion Process ◽

Oxidation Products ◽

Organic Sulfur ◽

Scanning Calorimetry ◽

Clean Coal ◽

Spontaneous Combustion Of Coal

Research on the spontaneous combustion of coal caused by sulfur has always been focused on pyrite in coal but has rarely considered the influence of organic sulfur. In this paper, coal samples, rather than model compounds, were used to study the influence of organic sulfur content in coal on its spontaneous combustion process. The results of X-ray photoelectron spectroscopy and thermogravimetry, differential scanning calorimetry, and mass spectrometry indicate that organic sulfur in Shuiyu clean coal exists in forms of mercaptan, thioether, sulfone (sulfoxide), and thiophene. With the decrease of organic sulfur content, the characteristic temperature points and the peak values of the exothermic curves in the process of coal oxidation spontaneous combustion all shifted toward higher temperatures. The ignition activation energy of coal also increased, and the initial and peak gas evolution temperatures of the oxidation products shifted toward higher temperatures. These findings suggest that the reduction of organic sulfur content can inhibit the oxidation process and spontaneous combustion tendency of coal. This effectively reveals the mechanism of the spontaneous combustion of coal and is of great significance to future studies in this field.

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Evaluation of the thermal properties of diesel oil with low sulfur content

Journal of Thermal Analysis and Calorimetry ◽

10.1007/s10973-017-6185-8 ◽

2017 ◽

Vol 131 (1) ◽

pp. 697-704 ◽

Cited By ~ 2

Author(s):

Camila G. D. Peixoto ◽

Valter J. Fernandes ◽

Ana C. F. Coriolano ◽

Renkel R. Araujo ◽

Glauber J. T. Fernandes ◽

...

Keyword(s):

Thermal Properties ◽

Sulfur Content ◽

Diesel Oil ◽

Low Sulfur Content ◽

Low Sulfur

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Chalcophile elements in Martian meteorites indicate low sulfur content in the Martian interior and a volatile element-depleted late veneer

Earth and Planetary Science Letters ◽

10.1016/j.epsl.2017.01.023 ◽

2017 ◽

Vol 463 ◽

pp. 56-68 ◽

Cited By ~ 20

Author(s):

Zaicong Wang ◽

Harry Becker

Keyword(s):

Sulfur Content ◽

Volatile Element ◽

Chalcophile Elements ◽

Martian Meteorites ◽

Low Sulfur Content ◽

Low Sulfur ◽

Late Veneer

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Occupational Exposure to Fine Particulate Matter (PM4 and PM2.5) during Hand-Made Cookware Operation: Personal, Indoor and Outdoor Levels

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17207522 ◽

2020 ◽

Vol 17 (20) ◽

pp. 7522

Author(s):

Busisiwe Shezi ◽

Angela Mathee ◽

Nokulunga Cele ◽

Sipho Ndabandaba ◽

Renee A. Street

Keyword(s):

Particulate Matter ◽

Occupational Exposure ◽

Fine Particles ◽

Fine Particulate Matter ◽

Health And Safety ◽

Chemical Characterization ◽

Personal Exposure ◽

Targeted Prevention ◽

Fine Particulate ◽

Indoor And Outdoor

(1) Exposure of informal artisanal cookware makers to fine particles has not yet been characterized. The aim of this study was to characterize occupational exposure to fine particulate matter (PM4 and PM2.5) levels and fine particulate matter (PM2.5) elemental components; (2) Artisanal cookware makers were recruited from five cookware making sites. Exposure to fine particulate matter was measured for 17 male participants. SidePak personal aerosol monitors (AM520) were used to measure personal exposure to PM4, while a DustTrak monitor and an E-sampler were used to assess indoor and outdoor PM2.5 levels, respectively. A questionnaire was administered to capture information on demographic characteristics. The chemical characterization of indoor and outdoor PM2.5 filter mass was conducted using Wavelength Dispersive X-ray Fluorescence. Time series record of 15-min averages for indoor and outdoor PM2.5 levels were assessed; (3) The median (range) was 124 µg/m3 (23−100,000), 64 µg/m3 (1−6097) and 12 µg/m3 (4−1178), respectively, for personal PM4, indoor and outdoor PM2.5. The highest levels for many of the elemental components of PM2.5 were found in the outdoor PM2.5 filter mass and (4). The information generated during this study may assist in extending occupational health and safety strategies to artisanal cookware makers and developing targeted prevention initiatives.

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