Study on calcium catalyzes coal spontaneous combustion

Qiao, Ling; Deng, Cunbao; Lü, Bing; Wang, Yansheng; Wang, Xuefeng; Deng, Hanzhong; Zhang, Xun

doi:10.1016/j.fuel.2021.121884

Cited by 30 publications

(7 citation statements)

References 26 publications

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“…According to the adiabatic oxidation experimental prediction model 21 – 23 , the laboratory has developed adiabatic oxidation experimental equipment by itself, and collected the CO gas generated during the coal oxidation process. The principle of the device is shown in Fig.…”

Section: Experiments and Methodsmentioning

confidence: 99%

Experimental research on the spontaneous combustion of Yangquan coal induced by electrochemical oxidation of pyrite

Zhang

Lü

Xiang

et al. 2022

Sci Rep

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The 15# coal seam of Yangmei No.5 Mine, which produces anthracite, which is the least prone to spontaneous combustion, has a serious hidden danger of spontaneous combustion due to the high sulfur content in the coal. Based on the better conductivity of anthracite, we designed an electrolysis experiment to accelerate the electrochemical oxidation of pyrite in coal. Through experiments and analysis of thermodynamic characteristic parameters, it is obtained that the electrochemical oxidation of pyrite and its main products Fe3+ and Fe2+ have a coupled catalytic effect on the spontaneous combustion of high-sulfur coal in Yangquan. Combined with the FTIR test and analysis, it is found that the electrochemical process causes spatial polarization in the coal, so that polar groups such as –OH undergo spatial diversion and increase the activity. Due to the high content of –OH in Yangquan anthracite, the electrochemical process has the greatest effect on promoting –OH oxidation. Fe3+ and Fe2+ act as strong oxidants and free radicals to promote the –CH2– reaction to generate C=O and promote the generation of CO. This research provides a new direction for the exploration of the spontaneous combustion mechanism of high-sulfur anthracite.

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Section: Experiments and Methodsmentioning

confidence: 99%

Experimental research on the spontaneous combustion of Yangquan coal induced by electrochemical oxidation of pyrite

Zhang

Lü

Xiang

et al. 2022

Sci Rep

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“…The periodic box without O 2 is the pyrolysis group. The periodic box density is 0.5 g/cm 3 . The model results are shown in Figure 1.…”

Section: Modeling and Computational Detailsmentioning

confidence: 99%

“…Therefore, the study of coal spontaneous combustion mechanism is the key to prevent coal spontaneous combustion in advance. Generally speaking, coals that are prone to spontaneous combustion contain abundant organic active groups, such as oxygen bridges, carbonyl groups, carboxyl groups, and hydroxyl groups, which have a significant impact on coal spontaneous combustion. − Many scholars have analyzed from an experimental perspective that the participation of active groups in oxidation heat release is the main factor affecting coal spontaneous combustion. − Some scholars also studied the influence of active groups such as hydroxyl and aldehyde on coal oxidation reaction characteristics from the perspective of quantum chemistry. , From the above studies it can be inferred that the organic reactive group reaction in coal is important for coal spontaneous combustion from macroscopic experimental point of view and quantum chemical analysis. However, it is difficult to obtain the detailed reaction path and reaction mechanism of the active structure in coal accurately from the molecular point of view by macroscopic experimental methods and quantum chemical simulation methods.…”

Section: Introductionmentioning

confidence: 99%

“…Generally speaking, coals that are prone to spontaneous combustion contain abundant organic active groups, such as oxygen bridges, carbonyl groups, carboxyl groups, and hydroxyl groups, which have a significant impact on coal spontaneous combustion. 1 − 3 Many scholars have analyzed from an experimental perspective that the participation of active groups in oxidation heat release is the main factor affecting coal spontaneous combustion. 4 − 6 Some scholars also studied the influence of active groups such as hydroxyl 7 and aldehyde 8 on coal oxidation reaction characteristics from the perspective of quantum chemistry.…”

Section: Introductionmentioning

confidence: 99%

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Study on Reaction Sites of Active Structures in Coal Based on the ReaxFF Reactive Force Field

Wang

Ding

et al. 2022

ACS Omega

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To study the reaction paths and reaction mechanisms of the active structures in coal during the oxidation process, the oxygen-free pyrolysis and oxygen-containing combustion were simulated for nine active structures in coal based on the ReaxFF MD method. A separate simulation analysis of the active structure yielded that O2 inhibited the reaction of H1. As the branched chain grows, the reaction paths of C2 and Q2 follow the direction of the reaction of carboxyl and aldehyde groups to CO2 and CO. Considering the reaction rates and reaction process products of A1, B1, and B3 structures, it is obtained that O2 has the greatest contribution to the decomposition reaction of aliphatic hydrocarbon structures. This is due to the strong electron-absorbing property of O2 that attracts H radicals to generate HO2, which in turn affects the reaction path of the active structure. Tracing the reaction process reveals that OH and oxygen-containing radicals under oxygen-free conditions greatly influence the active structural reaction.

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“…High-salinity mine water contains large amounts of total dissolved solids (chloride and sulfates) . Chlorides, including CaCl 2 , NaCl, MgCl 2 and KCl, were often used as an inhibitor of CSC because of their abundant source and good inhibition effect. − Lv et al found that the inhibition of NaCl and KCl could absorb water and form a liquid film on the coal surface. MgCl 2 would generate chemical components that inhibited CSC in the process of the free radical chain reaction, and the risk index of CSC was the lowest .…”

Section: Introductionmentioning

confidence: 99%

Influence of High Sulfate Mine Water on Spontaneous Combustion of Coal

et al. 2022

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Mine water cannot be discharged until it has been treated, which increases the cost of mining and causes environmental damage. This paper attempted to use sulfate mine water as a flame retardant material for the treatment of coal spontaneous combustion (CSC) in underground mines. The temperature-programed experimental device and gas chromatograph were used to simulate the low-temperature oxidation process of coal. Infrared spectroscopy was used to study the influence and inhibition mechanism of mine water and chloride inhibitor on active functional groups. It was found that although the sulfate mine water inhibited the formation of −OH, it accelerated the cleavage of the aromatic ring. The thermogravimetric experiment was used to analyze the ignition temperature and activation energy of different coal samples. It was found that mine water had an obvious effect on inhibiting CSC in the combustion stage, which could increase the oxidation temperature of coal.

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Study on calcium catalyzes coal spontaneous combustion

Cited by 30 publications

References 26 publications

Experimental research on the spontaneous combustion of Yangquan coal induced by electrochemical oxidation of pyrite

Experimental research on the spontaneous combustion of Yangquan coal induced by electrochemical oxidation of pyrite

Study on Reaction Sites of Active Structures in Coal Based on the ReaxFF Reactive Force Field

Influence of High Sulfate Mine Water on Spontaneous Combustion of Coal

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