Study on Spontaneous Combustion Tendency of Coals with Different Metamorphic Grade at Low Moisture Content Based on TPO-DSC

Fan, Jiuyuan; Wang, Gang; Zhang, Jiuling

doi:10.3390/en12203890

Cited by 16 publications

(6 citation statements)

References 35 publications

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“…According to the report of Ministry of Coal, the all India Production of coal during 2022-23 was 893.19 MT with a positive growth of 14.77% ( https://coal.gov.in/en/major-statistics/production-and-supplies ). According to the Geological Survey of India, the total geological resource of lignite of the country stands at 45,758.70 million tonne as on 1 April 2019 and major deposits are located in the state of Tamil Nadu, followed by Rajasthan, Gujarat, Kerala, West Bengal, Union Territory of Jammu & Kashmir and, Pondicherry ( Fan et al, 2019 ). Though India has significant lignite reserves, the majority of these are located in environmentally sensitive geographical areas or at a depth of economically unviable options for exploration.…”

Section: Introductionmentioning

confidence: 99%

Laboratory investigation and core flood demonstration of enhanced biogenic methane generation from lignite

Basera,

Lavania,

Singh

et al. 2024

Front. Bioeng. Biotechnol.

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Over the last several decades, coalbed methane (CBM) has emerged as an important energy source in developing nations like India as well as worldwide and is expected to play a significant role in the energy portfolio of the future. The current scenario of rapid exhaustion of fossil fuels is leading to the need to explore alternative and efficient fuel resources. The present study demonstrates enhanced methane production per gram of lignite (lowest-rank coal). Optimization of the bioconversion of lignite to methane revealed 55°C temperature and 1.5 g/L NaCl concentration as ambient conditions for the process. A scale-up study in the optimized condition showed 2,800 mM methane production per 25 g of lignite in anaerobic conditions. Further, Fourier transform Infrared (FTIR) and Gas Chromatography Mass Spectrometry (GCMS) analysis showed bioconversion of lignite into simpler intermediate substrates required for methane production. The results highlighted that the bacterial action first converts lignite into volatile fatty acids, which subsequently get converted into methane. Further, the exploration of indigenous microbial consortia in Tharad well (THAA) mainly comprises the order Methanosarcinales and Methanomicrobiales. The pathogenicity of the microbial consortium THAA was declared safe for use in mice via the oral route by The Energy and Resources Institute (TERI), India. The study demonstrated the development of indigenous consortia (TERI THAA), which can potentially enhance methane production from the lowest coal grade under extreme conditions in Indian coal beds.

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Section: Introductionmentioning

confidence: 99%

Laboratory investigation and core flood demonstration of enhanced biogenic methane generation from lignite

Basera,

Lavania,

Singh

et al. 2024

Front. Bioeng. Biotechnol.

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“…In the study of coal-based polymers and composites, it is very important to study the oxidation and spontaneous combustion characteristics of anthracite. Relevant researchers have carried out some research work in this area (Zhang et al, 2015;Fan et al, 2019;Li et al, 2020;Vershinina et al, 2020;Xi et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Study on the Change Law of Red-Green-Blue Values of Infrared Thermal Image in the Process of Anthracite Oxidation and Spontaneous Combustion

Wang

2022

Front. Mater.

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As the coal with the highest degree of coalification, anthracite is usually regarded as a mixture composed of organic and inorganic substances, with the characteristics of polymers and composites. It is very important to study the oxidation and spontaneous combustion characteristics of anthracite for the thermal properties of coal-based polymers and composites. Anthracite exhibits varying oxidation and spontaneous combustion characteristics at various stages of the oxidation and spontaneous combustion process, which cannot be fully demonstrated by the coal temperature alone. As a result, this paper develops an online method for characterizing the RGB values of infrared thermal images. The variation of the RGB value of an infrared thermal image during the oxidation and spontaneous combustion of anthracite was investigated. The findings show that there is a clear relationship between R (red), G (green), B (blue), RGB (red/green/blue) values, and coal temperature during the oxidation and spontaneous combustion of anthracite. The R and the G value curves each have one characteristic peak and two characteristic valleys in the experiment. However, the overall change range of the G value curve is relatively small; the B value curve has two characteristic peaks and one characteristic valley. There are no characteristic peaks and valleys in the RGB value curve, despite the influence of experimental instruments and the experimental environment.

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“…At present, the research on coal's spontaneous combustion mechanism and its reaction characteristics is relatively mature [13][14][15][16], and the research of the reignition characteristics of coalfield fire areas mainly focuses on the basic macro-experiments of reignition conditions and indicators [17][18][19][20][21][22]. However, the ignition sources of reignition in fire zone mainly come from pyrolysis or low oxygen combustion reaction, but related researches mainly discuss the internal structure change law of coal pyrolysis or low oxygen combustion process affected by different gas environments [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Pyrolysis and Low Oxygen Combustion of Long Flame Coal and Reburning of Residues

et al. 2021

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To further understand the problems of coal combustion and coalfield fire reignition, this paper researched the reaction characteristics of coal pyrolysis and low oxygen combustion and the reburning oxidation characteristics of residual structure by thermal analysis methods. The results show that temperature promotes both pyrolysis and low oxygen combustion reactions, but low oxygen combustion reaction is more sensitive to temperature changes. As the constant temperature rises, the mass reduction rate of low oxygen combustion of coal samples reaches 80% on average, which is 4 times that of pyrolysis, and the variations of thermogravimetric parameters are also significantly higher than those of pyrolysis. However, the higher the pyrolysis degree of the residues, the stronger their oxidizability, which greatly enhances the intensity and concentration of the secondary combustion, and the mass of residues is reduced by 90% on average. Conversely, because the combustible components are continuously consumed during low oxygen combustion, the reburning characteristics of residues become less obvious. For instance, the weight loss rate slows down, the burning becomes dispersed, and the burning intensity is weakened. In addition, the heat release is reduced from 8662 to 444.5 J/g, and the change trend is just opposite to that of pyrolysis. The above results show that as the constant temperature rises, the pyrolysis reaction greatly shortens the reburning process, while the low oxygen combustion reaction largely inhibits the reburning.

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Study on Spontaneous Combustion Tendency of Coals with Different Metamorphic Grade at Low Moisture Content Based on TPO-DSC

Cited by 16 publications

References 35 publications

Laboratory investigation and core flood demonstration of enhanced biogenic methane generation from lignite

Laboratory investigation and core flood demonstration of enhanced biogenic methane generation from lignite

Study on the Change Law of Red-Green-Blue Values of Infrared Thermal Image in the Process of Anthracite Oxidation and Spontaneous Combustion

Characteristics of Pyrolysis and Low Oxygen Combustion of Long Flame Coal and Reburning of Residues

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