Experimental assessment of multi-parameter index gas correlation and prediction system for coal spontaneous combustion

Yan, Hongyuan; Nie, Baisheng; Liu, Peijun; Chen, Zongyu; Yin, Feifei; Gong, Jie; Sha, Lin; Wang, Xiaotong; Kong, Fanbei; Hou, Yanan

doi:10.1016/j.combustflame.2022.112485

Cited by 18 publications

(5 citation statements)

References 35 publications

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“…The production of carbon oxides holds substantial importance in researching coal SC, serving as a pivotal indicator for assessing coal's oxidation characteristics Yan et al 2023). The trend of CO and CO2 generation rate is shown in Fig.…”

Section: Carbon Oxides Production Ratementioning

confidence: 99%

Study on the oxidized gas production characteristics and spontaneous combustion tendency of pre-oxidized water-soaked coal in lean-oxygen environments

Niu,

Yang,

Sun

et al. 2024

Environ Sci Pollut Res

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In order to study the oxidation characteristics and spontaneous combustion (SC) tendency of pre-oxidized long-term water-soaked coal under different oxygen concentrations, raw long-flame coal (RC), water-soaked 200-day coal (S200), pre-oxidized water-soaked coal at 200 ℃ (O200S200), and preoxidized water-soaked coal at 300 ℃ (O300S200) coals were used for the study. The coal spontaneous combustion(SC) program heating test system was adopted to conduct experimental analyses at 21%, 15%, 10%, 5%, 3% oxygen concentration(OC) for experimental analysis. The results show that pre-oxidation water-soaked treatment(PWT) promotes the coal-oxygen complex reaction and increases the rate of coal oxygen consumption(OCR) and the rate of carbon and oxygen compounds production. The rate of CO and CO2 production of the water-soaked(WS) coal increased by 0.329 mol•(cm 3 •s) -1 and 0.922 mol•(cm 3 •s) -1 , respectively, compared with that of the original coal sample. PWT reduces the activation energy of coal in the low-temperature oxidation stage (the maximum difference can be up to 110.99 KJ/mol) and enhances the oxidizing and heat-releasing capacity. There is a large amount of water in the WS coal, and its cross-point temperature and SC propensity index increased. There was a synergistic effect between the pre-oxidation(PO) and WS treatment, and the lowest comprehensive determination index of the SC propensity of coal in O200S200 samples was 831.92 which was 4.72 lower than that of RC

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Section: Carbon Oxides Production Ratementioning

confidence: 99%

Study on the oxidized gas production characteristics and spontaneous combustion tendency of pre-oxidized water-soaked coal in lean-oxygen environments

Niu,

Yang,

Sun

et al. 2024

Environ Sci Pollut Res

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“…A vibrating screen is used to screen the coal samples with different crushing degrees, and coal samples with particle sizes between 0.1 and 0.15 mm are selected for the experiment. A temperature-programmed device was used to oxidize raw coal and details of the device can be found in a previous study. , The mass of the coal sample was 100 g, the heating rate was 1 °C/min, the flow rate of the experimental gas was 50 mL/min, and the gas composition was dry air, that is, the volume fraction of oxygen was 21%. The gas produced by oxidation in the coal sample tank was extracted at 10 °C intervals and the composition and content of the gas were analyzed through gas chromatography.…”

Section: Samples and Experimentsmentioning

confidence: 99%

Study on the Variations of Key Groups and Thermal Characteristic Parameters during Coal Secondary Spontaneous Combustion

2023

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To investigate the effect of preoxidation on the secondary spontaneous combustion of coal, the changes in the key groups and thermal characteristic parameters in coal after preoxidation were investigated through Fourier transform infrared spectroscopy (FTIR), laser thermal conductivity, and thermogravimetric experiments. Results showed that the aromatic hydrocarbons in coal gradually decrease with the rise in the preoxidation temperature, the aliphatic hydrocarbons increase and then decrease, the −C–O– group gradually decreases, and the −CO and −COO– group content slowly increases. Preoxidation promotes the breakdown of aromatic hydrocarbons and the oxidation of oxygen-containing functional groups in coal. Meanwhile, the thermal diffusivity of coal decreases after preoxidation, while the specific heat capacity and thermal conductivity increase and then decrease. The results of the thermogravimetric analysis indicate that preoxidation changes the characteristic temperature, but it does not change the process of spontaneous combustion. The spontaneous combustion process of raw and preoxidized coals can be divided into three stages: water evaporation, oxygen adsorption, and combustion. Further, the apparent activation energy increases and then decreases with a rise in the preoxidation temperature during the moisture evaporation stage, increases during the oxygen adsorption stage, and decreases during the combustion stage.

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“…Until now, there have been many relevant studies on the changes in gas during coal spontaneous combustion and oxidation. Yan et al 2 conducted programmed heating experiments on coal, analyzing the trends of oxidation products, alkane gases, and olefin gases, as well as the ratios of each indicator gas to temperature. Nie et al 3 used an experimental temperature program system to simulate the spontaneous combustion and oxidation of three types of coal with different degrees of metamorphism at three oxygen concentrations.…”

Section: Introductionmentioning

confidence: 99%

“…Until now, there have been many relevant studies on the changes in gas during coal spontaneous combustion and oxidation. Yan et al conducted programmed heating experiments on coal, analyzing the trends of oxidation products, alkane gases, and olefin gases, as well as the ratios of each indicator gas to temperature. Nie et al .…”

Section: Introductionmentioning

confidence: 99%

Study on the Explosion Characteristics of CH₄ with the Addition of Coal Spontaneous Combustion Gases

Liu,

Wang,

Luo

et al. 2024

ACS Chem. Health Saf.

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Combustible gases produced during the coal spontaneous combustion (CSC) process will cause hidden danger for mine safety. For studying the effect of the addition of CSC gas on CH4 explosion characteristics, a 20 L explosive device was adopted to obtain the explosion characteristics of CH4 (7%, 9.5%, and 11% in vol.) and CSC gas (0–2% in vol.) premixed fuel, and the effect of CSC gas on CH4 explosion characteristics was analyzed. Results show that for 7% CH4, CSC gas promotes the CH4 explosion. However, for 11% CH4, CSC gas inhibits the explosion of CH4. Based on the chemical reaction kinetics analysis, it indicates that adding CSC gas at different stages changes the sensitivity coefficients, which affects the concentration of active radicals. With the increase of CSC gas in CH4, the concentration of H increased, the concentration of O decreased, and the concentration of OH increased first and then decreased. The variations of O and OH are regarded to be the main reason for promoting the explosion of dilute CH4 and inhibiting the explosion of concentrated CH4. The variations of H, O, and OH indicate that the addition of the self-heating oxidation stage of CSC gas has a more evident effect on the CH4 explosion characteristics.

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Experimental assessment of multi-parameter index gas correlation and prediction system for coal spontaneous combustion

Cited by 18 publications

References 35 publications

Study on the oxidized gas production characteristics and spontaneous combustion tendency of pre-oxidized water-soaked coal in lean-oxygen environments

Study on the oxidized gas production characteristics and spontaneous combustion tendency of pre-oxidized water-soaked coal in lean-oxygen environments

Study on the Variations of Key Groups and Thermal Characteristic Parameters during Coal Secondary Spontaneous Combustion

Study on the Explosion Characteristics of CH₄ with the Addition of Coal Spontaneous Combustion Gases

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Experimental assessment of multi-parameter index gas correlation and prediction system for coal spontaneous combustion

Cited by 18 publications

References 35 publications

Study on the oxidized gas production characteristics and spontaneous combustion tendency of pre-oxidized water-soaked coal in lean-oxygen environments

Study on the oxidized gas production characteristics and spontaneous combustion tendency of pre-oxidized water-soaked coal in lean-oxygen environments

Study on the Variations of Key Groups and Thermal Characteristic Parameters during Coal Secondary Spontaneous Combustion

Study on the Explosion Characteristics of CH4 with the Addition of Coal Spontaneous Combustion Gases

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Study on the Explosion Characteristics of CH₄ with the Addition of Coal Spontaneous Combustion Gases