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

Si, Fangyuan; Zhang, Hongming; Feng, Xiangrui; Dou, Jiawei; Wu, Long; Li, Linglong; Wang, Lingyun; Zhao, Lanming

doi:10.1021/acsomega.3c04837

Cited by 6 publications

(2 citation statements)

References 36 publications

(49 reference statements)

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“…The active ingredient in the coal was basically consumed, and the combustion rate gradually decreased after this point. Until reaching the burnout temperature T 6 , the quality of the coal samples tended to stabilize and no longer changed [33]. The TG-DTG curve inclined to a stable value at T 6 , indicating that coal's oxidation and decomposition process had basically concluded.…”

Section: Experimental Results 41 Characteristic Temperature Analysismentioning

confidence: 98%

Research on the Inhibitory Effect of Hydrated Phase Change Materials on Spontaneous Combustion in Coal

Wu,

Shi,

Shao

et al. 2024

Fire

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In order to study the effect of hydrated phase change materials on the suppression of spontaneous combustion in coal, a thermogravimetric experiment and a reaction activation energy analysis experiment were conducted to explore the changes in the combustion characteristic parameters, characteristic temperature, and activating energy of gas coal, long-flame coal, meagre coal, and lean coal before and after adding hydrated phase change materials. The research results indicated that hydrated phase change materials increased the characteristic temperature point of the coal samples and had effective inhibitory effects on different stages of the oxidation process. However, the effect was best at low temperatures, as hydrated phase change materials undergo phase change and absorb heat when heated at low temperatures, isolating coal from contact with oxygen. The activating energy increased by 1.138–23.048 KJ·mol−1 and the mass loss was reduced by 1.6%–9.3% after inhibition of the coal samples, indicating that the oxidation rate of the various coal samples was slowed down and, thus, spontaneous combustion can be suppressed through the use of hydrated phase change materials. At the same time, this material reduced the combustibility indices of meagre coal and lean coal, as well as the comprehensive combustion indices of long-flame coal and gas coal.

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Section: Experimental Results 41 Characteristic Temperature Analysismentioning

confidence: 98%

Research on the Inhibitory Effect of Hydrated Phase Change Materials on Spontaneous Combustion in Coal

Wu,

Shi,

Shao

et al. 2024

Fire

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“…This paper conducts SEM, EDS and XRD analysis tests to obtain the physical and chemical characteristics of Al–Mg alloy particles. Through TG-DSC experiments, − the kinetic parameters of Al–Mg reaction in a water vapor atmosphere (H 2 O(g)) are obtained. Using combined kinetic analysis methods and comparison with classical mechanism functions, a kinetic model suitable for the Al–Mg reaction in H 2 O(g) is obtained to reveal the reaction mechanism of Al–Mg with water and provide theoretical support for the ignition and combustion characteristics of Al–Mg in H 2 O(g) and the engineering application of powder-based water jet propulsion engines.…”

Section: Introductionmentioning

confidence: 99%

Kinetic Analysis of the Reaction of Micrometer-Sized Al–Mg Alloy Particles in a Water Vapor Atmosphere

Wei,

Han,

Lei

et al. 2024

Langmuir

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This study investigated the reaction mechanism of aluminum−magnesium (Al−Mg) alloy particles with water (Al− Mg/H 2 O) through thermogravimetric analysis-differential scanning calorimetry experiments and kinetic analysis using isoconversional methods and the master plot technique to determine the reaction mechanism function, with the aim of providing insights to support metal powder/water ramjet engine design and combustion characteristics. The results showed that the Al−Mg/H 2 O reaction occurred in two distinct stages, with stage 1 primarily involving the reaction of Mg elements in the L(Al−Mg) alloy with water while Al played a leading role in stage 2. Notably, the reaction temperatures of Al−Mg particles were significantly lower than those for either Al or Mg particles alone in a water vapor environment. Additionally, the activation energy of stage 1 was lower than that for the individual Al and Mg particles and decreased with increasing Mg content in stage 2. Furthermore, the concentration of Mg in the alloy was found to have a major influence on the reaction mechanism, which followed a random nucleation and growth model. Overall, this work elucidated an alternating endothermic and exothermic staged reaction process for Al−Mg/H 2 O dominated first by Mg and then Al with kinetic insights providing theoretical support for optimizing Al−Mg alloy compositions for improved ignition and combustion performance in metal powder/water ramjet engines.

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Non-isothermal kinetics and characteristics of calcium carbide nitridation reaction with calcium-based additives

Zhang,

Yu,

Zhang

et al. 2024

Front. Chem. Sci. Eng.

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

Cited by 6 publications

References 36 publications

Research on the Inhibitory Effect of Hydrated Phase Change Materials on Spontaneous Combustion in Coal

Research on the Inhibitory Effect of Hydrated Phase Change Materials on Spontaneous Combustion in Coal

Kinetic Analysis of the Reaction of Micrometer-Sized Al–Mg Alloy Particles in a Water Vapor Atmosphere

Non-isothermal kinetics and characteristics of calcium carbide nitridation reaction with calcium-based additives

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