Inhibition mechanism of spontaneous combustion by nano-sized complex inhibitor for Chinese lignite in low-temperature oxidation

Chu, Ruizhi; Wu, Jiaxin; Meng, Xiuxia; Wan, Yongzhou; Miao, Zhenyong; Yu, Shi; Bai, Lei

doi:10.1080/00986445.2019.1680373

Cited by 9 publications

(3 citation statements)

References 27 publications

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“…Aluminum trihydroxide (Al(OH) 3 ) is the most commonly used inorganic hydroxide as a flame retardant filler. Depending on the particle size, Al(OH) 3 is processed at temperatures below its decomposition point, ranging from 190 to 230 °C [ 250 ]. Usually, Al(OH) 3 is used as a flame retardant filler in thermoplastics, thermosetting resins, and elastomers that are processed at temperatures less than 200 °C with particle sizes larger than 50 µm [ 251 , 252 ].…”

Section: Flame Retardant Coating Formulations and Designs: The Implem...mentioning

confidence: 99%

Flame Retardant Coatings: Additives, Binders, and Fillers

et al. 2022

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This review provides an intensive overview of flame retardant coating systems. The occurrence of flame due to thermal degradation of the polymer substrate as a result of overheating is one of the major concerns. Hence, coating is the best solution to this problem as it prevents the substrate from igniting the flame. In this review, the descriptions of several classifications of coating and their relation to thermal degradation and flammability were discussed. The details of flame retardants and flame retardant coatings in terms of principles, types, mechanisms, and properties were explained as well. This overview imparted the importance of intumescent flame retardant coatings in preventing the spread of flame via the formation of a multicellular charred layer. Thus, the intended intumescence can reduce the risk of flame from inherently flammable materials used to maintain a high standard of living.

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Section: Flame Retardant Coating Formulations and Designs: The Implem...mentioning

confidence: 99%

Flame Retardant Coatings: Additives, Binders, and Fillers

et al. 2022

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“…Many studies put forward that sodium persulfate inhibitors promote the formation of stable ether, alkyl and carboxylic acids in the coal active groups 15,16 . Al(OH) 3 effectively delayed the water evaporation process of coal samples at the low‐temperature oxidation stage 17 . Phosphorus flame retardant (PFR) significantly prevents coal spontaneous combustion and reduces the CO content produced by coal oxidation at low temperature.…”

Section: Introductionmentioning

confidence: 99%

“…15,16 Al(OH) 3 effectively delayed the water evaporation process of coal samples at the low-temperature oxidation stage. 17 Phosphorus flame retardant (PFR) significantly prevents coal spontaneous combustion and reduces the CO content produced by coal oxidation at low temperature. The flame-retardant efficiency rises with the increase of temperature.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the suppression characteristic of deoxidization gel foam on coal spontaneous combustion

Xue

Wang

et al. 2021

Fire and Materials

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Summary Mine fire caused by coal spontaneous combustion is one of the main safety problems in mining. For the purpose of developing a more effective inhibitor to suppress the coal spontaneous combustion, a compound deoxidization gel foam inhibitor was proposed by combining sodium dithionite deoxidizer with gel foam. An experimental platform was self‐built to evaluate the suppression characteristic of deoxidization gel foam. Experimental results showed that the deoxidization gel foam reduced the oxygen concentration to below 14% within 180 minutes. STA‐FTIR test indicated that the deoxidization gel foam raised the active temperature from 250.57°C to 275.18°C and reduced CO2 absorption peak from 0.2926 to 0.2201 at the reaction temperature 20°C. The activation energy was also increased from 85.69 to 95.59 kJ·mol−1 in thermal decomposition combustion that exhibited an excellent flame‐retardant efficacy on the coal, especially at the low temperature stage. CH3 and CH2 were reduced by 56.86% and 47.17% processed by deoxidization gel foam. Meanwhile, the significant reduction in the content of reductive functional groups indicated that the new inhibitor had a strong suppression capacity for coal spontaneous combustion. Based on above research, it is believed that this study will lay an important foundation in the widespread application of deoxidization gel foam technology for coal spontaneous combustion prevention in underground mines.

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Moisture removal behaviour of single hard lignite particle during drying and quantitative characterization for its surface damage

et al. 2021

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It is extremely meaningful to study the damage behaviour of lignite for safe operation during the drying process. In this study, a single hard lignite particle (SHLP) was prepared for drying. The drying characteristics of an SHLP were described, and its drying kinetics were studied from the perspective of the drying model and effective diffusion coefficient (Deff). The development of surface cracks in drying were obtained, and the changes in surface damage were quantitatively described by relative crack rate (RCR). The results showed that the drying process for an SHLP was divided into three stages following the slope of the drying curve. The rapid removal of a large proportion of moisture mainly occurred in stage I. The Page model is the best model for describing the drying of an SHLP. In addition, Deff increased with increasing drying time. High temperature promoted the moisture transfer from the inside to the surface of an SHLP. Finally, surface cracks on the SHLP developed rapidly in the early drying stage; specifically, the primary cracks widened and lengthened, and the small cracks mainly attached to the primary cracks. In the later drying stage, cracks shrank and cracks in the branch structure closed. High drying temperature made the RCR of an SHLP reach the maximum value more quickly in stage I.

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Inhibition mechanism of spontaneous combustion by nano-sized complex inhibitor for Chinese lignite in low-temperature oxidation

Cited by 9 publications

References 27 publications

Flame Retardant Coatings: Additives, Binders, and Fillers

Flame Retardant Coatings: Additives, Binders, and Fillers

Investigation on the suppression characteristic of deoxidization gel foam on coal spontaneous combustion

Moisture removal behaviour of single hard lignite particle during drying and quantitative characterization for its surface damage

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