Effect of active functional groups in coal on the release behavior of small molecule gases during low-temperature oxidation

Meng, Xianliang; Sun, Jiali; Chu, Ruizhi; Fan, Lulu; Jiang, Xiaofeng; Tang, Ludeng; Zheng, Donglin

doi:10.1016/j.energy.2023.127290

Cited by 24 publications

(3 citation statements)

References 31 publications

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“…The absorption peak of the hydroxyl group in DT coal ash is reduced. Before 100 °C, the −OH thermal decomposition, free group, and hydroxyl atoms combined to form water and vapor, resulting in the reduction of −OH content in coal …”

Section: Resultsmentioning

confidence: 99%

“…Before 100 °C, the −OH thermal decomposition, free group, and hydroxyl atoms combined to form water and vapor, resulting in the reduction of −OH content in coal. 32 In the range of 3000−2800 cm −1 is a stretching vibrational band of aliphatic hydrocarbon structures. The main components are the asymmetric stretching vibration of −CH the ashes after combustion.…”

Section: Resultsmentioning

confidence: 99%

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Thermal Analysis Kinetics Study of Pulverized Coal Combustion under Oxygen-Rich Atmosphere

Si,

Zhang,

Feng

et al. 2023

ACS Omega

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The thermal analysis kinetic behavior of pulverized coal combustion in different oxygen-rich atmospheres is studied with a thermogravimetric (TG) analyzer. The effects of heating rate on combustion characteristic are considered. The results showed that the combustion rate of pulverized coal increased and the burnout time decreased under the conditions of an oxygen-enriched atmosphere and high heating rate. As the heating rate increases, the TG and derivative TG curves of the coal samples generally move toward the high-temperature region, and the thermal hysteresis phenomenon occurs. The changes in oxygen concentration and heating rate mainly affect the combustion stage of coal samples. The decrease in heating rate or the increase in oxygen concentration will cause a decrease in ignition point temperature and burnout temperature. Under the condition of 40% O2, the oxygen concentration and heating rate have the greatest influence on the combustion characteristic parameters. In addition, the combustion reaction of pulverized coal in the warming process was analyzed by FWO and KAS methods, respectively. The results showed that the changes in oxygen concentration and heating rate affected the activation energy, and the activation energy of coal samples increased with the increase in oxygen concentration.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Thermal Analysis Kinetics Study of Pulverized Coal Combustion under Oxygen-Rich Atmosphere

Si,

Zhang,

Feng

et al. 2023

ACS Omega

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“…The thermal cracking of oxidized functional groups generates many active sites, which are oxidized at room temperature to release mass gas and release heat 18 . Meng 19 studied the formation, release, and changes of active radicals of small molecular gases in low-rank coal during LTO by TG-DSC, TG-IR, and in-situ infrared measurements, and found that 100–200 °C is the key temperature for gas production. Zhang 20 studied the impact of radicals on heat during the influence of long-term immersion of bituminous coal was studied.…”

Section: Introductionmentioning

confidence: 99%

Influence of mudstone on coal spontaneous combustion characteristics and oxidation kinetics analysis

Zhang,

Zou,

et al. 2024

Sci Rep

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To explore the spontaneous combustion characteristics and hazards of the low-temperature oxidation (LTO) stage in the process of spontaneous combustion of coal and mudstone, the pore structure, spontaneous combustion characteristic parameters, and exothermic characteristics of coal and mudstone were tested and studied, and the oxidation kinetic parameters were calculated. The results show that mudstone has a larger specific surface area and pore volume than coal. From the fractal characteristics, the pore structure of mudstone is more complex than that of coal. According to the comparison of theoretical and actual gas generation and oxygen consumption rate curves, it is found that there is an interaction between coal and mudstone in the LTO process. With the increase of mudstone mass ratio, gas production, and its oxygen consumption rate increase. Among them, CM-4 (Coal:Mudstone = 1:1) has the highest exothermic intensity and the exothermic factor (A) and fire coefficient (K) increase with the increase of mudstone content. The apparent activation energy of the mudstone sample is lower than that of the raw coal, indicating that the sample after adding mudstone is more likely to have spontaneous combustion in the LTO stage.

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Thermal Generation Behavior, Key Groups and Disaster-Causing Mechanism of Unloaded Bulk Coal Under High Ground Temperature Conditions

Yu,

Niu,

Wang

et al. 2024

Nat Resour Res

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Effect of active functional groups in coal on the release behavior of small molecule gases during low-temperature oxidation

Cited by 24 publications

References 31 publications

Thermal Analysis Kinetics Study of Pulverized Coal Combustion under Oxygen-Rich Atmosphere

Thermal Analysis Kinetics Study of Pulverized Coal Combustion under Oxygen-Rich Atmosphere

Influence of mudstone on coal spontaneous combustion characteristics and oxidation kinetics analysis

Thermal Generation Behavior, Key Groups and Disaster-Causing Mechanism of Unloaded Bulk Coal Under High Ground Temperature Conditions

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