Numerical simulation and application experiment of the spontaneous combustion tendency of a coal stockpile covered with pulverized coal

Chu, Ruizhi; Wang, Minglei; Meng, Xiuxia; Liu, Peng; Liu, Zhenyi; Wu, Jiaxin; Yang, Deguang; Chen, Hui; Bai, Lei

doi:10.1002/cjce.23643

Cited by 9 publications

(2 citation statements)

References 24 publications

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“…Therefore, carbon monoxide CO is considered an index gas for spontaneous coal combustion 22–25 . By monitoring changes in CO concentration in real time, the coal oxidation process can be directly reflected to allow for immediate measures that curb the rise in temperature 26–29 . In the experimental system for simulating coal oxidation, the samples were heated from 40°C to 200°C in a mixed airflow with 0%, 5%, 15%, 25%, 35%, 45% CH 4 , and 15%–35% CH 4 with every 2% increase.…”

Section: Resultsmentioning

confidence: 99%

Effect of coalbed methane airflow with optimum action concentration on coal oxidation under low temperatures

Yang

et al. 2020

Asia-Pacific J Chem Eng

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To explore the effect of coalbed methane (CBM) airflow on coal oxidation under low temperatures, an experimental apparatus was developed and applied to simulate coal oxidation under different oxidizing atmospheres. The formation of carbon monoxide CO, the index gas, in CBM airflow was analyzed to obtain the optimum concentration of CH4 that exerted the strongest influence on coal oxidation. Then, a comparison experiment was performed on coal oxidation in dry air and in CH4 at the optimum concentration by using electron spin resonance (ESR) and Fourier transform infrared (FTIR) technology. The results suggest that 25% of CH4 has the strongest effect on coal oxidation at low temperatures. The free radical concentration (Ng) in coal increases with temperature in both dry air and 25% CH4. At this concentration, CH4 can inhibit the reactivity of coal substantially while raising the excitation temperature. The oxidation of aliphatic hydrocarbons is severely inhibited by 25% CH4, which reduces its consumption rate and abates its decrement in the initial phase. Although 25% CH4 restricts the consumption of –OH and –COOH in oxidation, it promotes the formation of –C–O.

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Section: Resultsmentioning

confidence: 99%

Effect of coalbed methane airflow with optimum action concentration on coal oxidation under low temperatures

Yang

et al. 2020

Asia-Pacific J Chem Eng

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“…[6] A high moisture content means low calorific value, high risk of spontaneous combustion, and high transportation cost, which seriously restricts the large-scale utilization of lignite. [7][8][9] In addition, the high moisture content of lignite has adverse effects on its combustion, gasification, liquefaction, and other utilization processes.…”

Section: Introductionmentioning

confidence: 99%

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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Application of aging effect model in numerical simulation for predicting spontaneous combustion of coal stockpiles

Zhang

Wang

et al. 2022

J Therm Anal Calorim

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Numerical simulation and application experiment of the spontaneous combustion tendency of a coal stockpile covered with pulverized coal

Cited by 9 publications

References 24 publications

Effect of coalbed methane airflow with optimum action concentration on coal oxidation under low temperatures

Effect of coalbed methane airflow with optimum action concentration on coal oxidation under low temperatures

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

Application of aging effect model in numerical simulation for predicting spontaneous combustion of coal stockpiles

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