An experimental approach to selecting chemical inhibitors to retard the spontaneous combustion of coal

Wang, Biao; Dou, Guolan; Zhong, Xiaoxing; Xin, Haihui; Qin, Botao

doi:10.1016/j.fuel.2013.09.070

Cited by 150 publications

(56 citation statements)

References 21 publications

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“…The above drainage experimental data is complementary and well-correlated with that of evolution of bubble diameter. CPT has been widely used as a means of characterizing the propensity of coal to self-ignite [36,37]. The influence of the FA-stabilized Pickering foams on coal oxidation characteristics was investigated based on the CPT data obtained from the analysis of coal samples blended with different content of Pickering foams, as indicated by the arrows in Fig.…”

Section: Kinetics Of Liquid Drainagementioning

confidence: 99%

“…Coal spontaneous oxidation in low temperature is subject to kinetic and has been intensively investigated [36][37][38][39]. It has been demonstrated that certain active sites (the so-called active groups) on the coal surface react exothermically with oxygen and provide energy to other oxidation reactions which require higher levels of activation energy.…”

Section: Carbon Monoxide (Co) Production-temperature Curvesmentioning

confidence: 99%

“…Therefore, it is crucial to suppress the oxidation of active groups when attempting to stabilize coal. Quantum chemical simulation calculation and in situ FTIR investigations have shown alkyl and hydroxyl groups are main active groups and primarily responsible for self-heating and the subsequent spontaneous combustion of coal at low temperature [36,40]. It has been established that the decomposition or oxidation of alkyl groups leads to the formation of CO 2 and CO, which have been recognized as an effective means of monitoring and predicting the onset of coal spontaneous combustion.…”

Section: Carbon Monoxide (Co) Production-temperature Curvesmentioning

confidence: 99%

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Micro fly-ash particles stabilized Pickering foams and its combustion-retardant characteristics

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Section: Kinetics Of Liquid Drainagementioning

confidence: 99%

Section: Carbon Monoxide (Co) Production-temperature Curvesmentioning

confidence: 99%

Section: Carbon Monoxide (Co) Production-temperature Curvesmentioning

confidence: 99%

See 1 more Smart Citation

Micro fly-ash particles stabilized Pickering foams and its combustion-retardant characteristics

Qin

Jia

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et al. 2015

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“…Presently, the inhibitors that are used in coal mines are mainly inorganic salts [7], such as NaCl, MgCl 2 , and CaCl 2 . Their role in preventing spontaneous coal combustion, in the presence of a large amount of water, is mainly water absorption [8], moisturizing, and coordination resistance [9]. Coordination resistance involves the contained metal cation forming a coordination compound with the active group in the coal, thereby preventing contact between the active group and the oxygen molecule and, consequently, the oxidation reaction.…”

Section: Introductionmentioning

confidence: 99%

Study on the Effect of Iron-Based Deoxidizing Inhibitors for Coal Spontaneous Combustion Prevention

et al. 2018

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Abstract:To improve the prevention of spontaneous coal combustion, reduced iron powder and other ingredients should be added together to form an iron-based deoxidizing inhibitor, with the dual effect of oxygen consumption and inhibition. The oxygen consumption rate of the inhibitor was studied through experiments. According to the theory of coordination resistance, the coordination resistance of Fe 3+ was studied via the density functional method. Subsequently, a comparative experiment of the effects on spontaneous coal combustion was conducted. The research shows that several kinds of common resistance agents that are added to the reduced iron powder can consume oxygen. However, the rate of oxygen consumption varies. Fe 3+ produced by the reduced iron powder indicates a strong coordination resistance. When compared with traditional inhibitors of Mg 2+ , Fe 3+ has a stronger inhibition effect on the N, P, and S reactive groups in coal. The overall inhibitory effect is better than that of traditional inhibitors, because of the increased oxygen consumption and the coordination resistance of Fe 3+ on the basis of traditional inhibitors.

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“…Experimental simulation is undoubtedly the most effective way to study the formation characteristics and the evolution law of coal self-heating. However, as there are extremely complex internal and external factors, a small-scale experimental method can better reveal the thermodynamics characteristics, temperature variation, and law of production for indicator gases, although it cannot monitor the position of the fire source due to passive heating or altering the external environment [4][5][6][7][8]. A largescale test of the spontaneous heating of coal can well simulate the field conditions and investigate the coal oxidation and exothermic features [9].…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental simulation of spontaneous combustion of coal

Yu¹,

Hu²

2017

Int. J. SAFE

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In this paper, our main aims are to make up for the defects of large-scale coal spontaneous heating tests on trial methods. An unsteady-state numerical model is developed to simulate self-heating in a largescale coal spontaneous heating reactor with experimental conditions. The self-heating process of coal is reproduced successfully, and the main characteristics of nonlinear heating and windward movement of the fire source are obtained during the whole process. By comparison, the simulated and experimental results of the Tianchi coal samples show a good agreement with the temperature rise features and fire source positions. This confirms the validity of the model. Based on the model, a sensitivity analysis is constructed to investigate the influence of the external environment on coal spontaneous heating. The main contents include (1) heat dissipation surroundings; (2) air quantity; (3) air direction. The simulated conclusions contribute to optimizing the experimental parameters and obtaining the shortest spontaneous combustion period. In addition, the model is found to be of great significance for predicting the fire source temperature and position in practical coal mine conditions.

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An experimental approach to selecting chemical inhibitors to retard the spontaneous combustion of coal

Cited by 150 publications

References 21 publications

Micro fly-ash particles stabilized Pickering foams and its combustion-retardant characteristics

Micro fly-ash particles stabilized Pickering foams and its combustion-retardant characteristics

Study on the Effect of Iron-Based Deoxidizing Inhibitors for Coal Spontaneous Combustion Prevention

Numerical and experimental simulation of spontaneous combustion of coal

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