Study of the microstructure and oxidation characteristics of residual coal in deep mines

Niu, Haijun; Sun, Qingqing; Bu, Yunchuan; Chen, Haiyan; Yang, Yanxiao; Li, Shuo-peng; Sun, Si-wei; Mao, Zihao; Meng, Tao

doi:10.1016/j.jclepro.2022.133923

Cited by 40 publications

(9 citation statements)

References 48 publications

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“…33,34 In summary, at present, the combustion mechanism of residual coal in goaf has been studied more maturely, and a variety of coal spontaneous combustion inhibition materials have appeared, but most of them focus on the study of free radical consumption and scavenging function; and the surface structure of coal is the main place for coal-oxygen contact. 4,10 It is of great significance to explore the chemical inhibition materials with physical sealing effect for the preparation of high-quality coal spontaneous combustion composite inhibition materials.…”

Section: Guo Et Al Developed a Composite Inhibiting Materials By Inco...mentioning

confidence: 99%

“…Coal spontaneous combustion is a common safety accident that occurs during the mining and transportation processes. Its occurrence is characterized by concealed fire sources, severe hazards, and high toxicity 4–6 . Hence, research on the mechanism and prevention technology of coal spontaneous combustion fire has always been a vital topic in the field of coal mine safety production.…”

Section: Introductionmentioning

confidence: 99%

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Study on the inhibitory effect of DL‐malic acid on the phase structure and combustion characteristics of coal

Sun,

Niu,

Yang

et al. 2023

Fire and Materials

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DL‐malic acid (DMA), as a recognized antioxidant inhibitor and chelating agent in the food and chemical industries, has good application prospects in coal fire prevention and control. This paper investigates the impact of a DMA solution on the surface properties and phase structure of coal through a range of analytical techniques, including electron microscope scanning, particle size analysis, and x‐ray diffraction. The thermal behavior characteristics of DMA‐treated coal were analyzed using thermogravimetric experiments. The results show that after adding malic acid, the particle size of coal sample is reduced, the sphericity and roundness are reduced, and the pore size is increased. The hydroxyapatite and calcite components in coal were dissolved and consumed, and the calcite components were gradually depleted with the increase of DMA concentration. The flocculent structure produced by the condensation of the crushing residue and broken small particles are attached to the internal pores of coal, which reduced the coal oxygen contact sites and increases the content of the sealed solution, resulting in the increase of the thermal characteristic temperature of the coal and the inhibition of the oxidation heat generation process. DMA has obvious inhibitory effect on fresh coal and oxidized coal, and the inhibitory effect is stronger on high‐temperature oxidized coal. Therefore, DMA can be effectively applied to the prevention and control of spontaneous combustion of residual coal in goaf. The research results provide a reference for the research of coal fire prevention technology and the preparation of environmentally friendly flame retardant materials.

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Section: Guo Et Al Developed a Composite Inhibiting Materials By Inco...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on the inhibitory effect of DL‐malic acid on the phase structure and combustion characteristics of coal

Sun,

Niu,

Yang

et al. 2023

Fire and Materials

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“…In addition, with the continuous exploitation of shallow coal seam resources and the increasing excavation depth of the mine, the occurrence rate of gas accidents increases, mine pressure increases significantly, and spontaneous coal combustion becomes increasingly serious. Deep mining brings huge challenges to safe production [11]. Based on the above factors, it is considered to use coal gasification ash as the base material to prepare anti-fire gel material by crosslinking with hydroxypropyl methylcellulose (HPMC).…”

Section: Figure 1 Comprehensive Utilization Of Gasification Ashmentioning

confidence: 99%

Inhibition property of gasification ash to coal spontaneous combustion

Wang,

Guo,

Zhang

et al. 2023

J. Phys.: Conf. Ser.

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In view of the problems of uncomprehensive utilization of solid waste resources and environmental pollution caused by the stacking of coal gasification cinder, the gel inhibition performance of coal gasification cinder was studied. A new kind of anti-fire gel material was prepared by crosslinking with gasification cinder as the base material, HPMC as the gelling agent, and Na2CO3 as the coagulant. The effect of coal to oil gasification ash gel on coal spontaneous combustion and activation energy was analyzed in essence and phenomenon through temperature-programmed experiments and determination of marker gases. Results showed that the concentration of CO gas and C2H4 gas of anthracite during the process of temperature oxidation decreased by 38.1% and 65.8%. The inhibition rate after gel treatment was 56.4%, and the activation energy was 6.5%. It shows that the adjunction of ash gel can validly mitigate the reaction rate of the coal spontaneous combustion process and inhibit the reaction procedure between coal and oxygen. The inhibition performance is better than the common CaCl2.

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“…Coal is the second largest fuel energy after oil (27% of total energy) and is commonly used for generating steel and electricity 3 . Coal spontaneous combustion (CSC) and carbon oxides from coal combustion are important factors that damage the climate 4 . As coal production and consumption increase year by year, CSC is becoming increasingly serious, which increases the world's total carbon oxide emissions year by year.…”

Section: Introductionmentioning

confidence: 99%

Review and prospects of research on materials to prevent and extinguish mine fires

Niu

Sun

et al. 2023

Fire and Materials

Self Cite

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Coal spontaneous combustion (CSC) has hindered the utilization of coal resources and the development of the global economy for centuries. At present, many materials are used for preventing and extinguishing CSC fires, and different types of materials have various sites of action. In this paper, research on CSC fire prevention and extinguishing materials is reviewed and proposed. The preparation schemes and effects of physical barrier materials, chemical inhibitors, composite materials, and other fields of fire prevention materials were discussed. The improved compounding schemes of CSC inhibiting materials were analyzed regarding the characteristics of base materials and material properties. It was found that in the field of fire prevention materials, plant extracts, hydrolyzed proteins, biomass, and other green recycling materials have gradually become the new trend in materials. The composite material has a synergistic physical barrier and chemical inhibition and has a good inhibitory effect on coal heat storage and group activation, which has become an inhibitory material that is highly concerning. CSC inhibiting technology involving microbial control has emerged and exhibits notable characteristics, including a green cycle and long action time, but its application still needs to control the coexistence of heterogeneous microorganisms and improve the environmental livability. High‐quality firefighting materials, which are used in preventing battery fires, fighting building fires, inert coatings of cotton fabric, and other fields, have potential applicational value for CSC prevention. This review aims to provide new ideas for the research of CSC fireproof materials.

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Study of the microstructure and oxidation characteristics of residual coal in deep mines

Cited by 40 publications

References 48 publications

Study on the inhibitory effect of DL‐malic acid on the phase structure and combustion characteristics of coal

Study on the inhibitory effect of DL‐malic acid on the phase structure and combustion characteristics of coal

Inhibition property of gasification ash to coal spontaneous combustion

Review and prospects of research on materials to prevent and extinguish mine fires

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