Experimental study and thermodynamic analysis of coal spontaneous combustion characteristics

Zhang, Minbo; Wang, Zichao; Wang, Longkang; Zhang, Zhen; Zhang, Dangyu; Li, Chunxin

doi:10.1080/13647830.2022.2153742

Cited by 19 publications

(6 citation statements)

References 27 publications

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“…In addition, the content of the CO, C–O, and −CH 3 /–CH 2 – groups in the coal samples decreased to varying degrees, exhibiting a trend of initially decreasing and then increasing with increasing size. This indicates that the water immersion process can increase the pore structure of the fractured coal body to a certain extent, which increases the contact sites between oxygen and the active groups in the coal; promotes the reaction between oxygen and the CO, C–O, and −CH 3 /–CH 2 – groups in the coal; and generates −OH groups, and the proportion of the CC functional group increases as the contents of other groups decrease …”

Section: Resultsmentioning

confidence: 99%

“…This indicates that the water immersion process can increase the pore structure of the fractured coal body to a certain extent, which increases the contact sites between oxygen and the active groups in the coal; promotes the reaction between oxygen and the C�O, C−O, and −CH 3 /−CH 2 − groups in the coal; and generates −OH groups, and the proportion of the C�C functional group increases as the contents of other groups decrease. 35 As is well known, during the infrared analysis of coal samples, any uncontrollable factors such as sample grinding, sample preparation thickness, and analysis time will affect the spectral peak area and intensity of the spectrogram to a certain extent. To avoid experimental errors caused by uncontrollable external factors, the peak area ratio was selected to fit the peaks of various functional groups, and the distribution characteristics of the functional groups in the coal samples were analyzed quantitatively.…”

Section: Functional Group Changes Inmentioning

confidence: 99%

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Experimental Study on the Influence of Pore Structure and Group Evolution on Spontaneous Combustion Characteristics of Coal Samples of Different Sizes During Immersion

Guo

et al. 2023

ACS Omega

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To study the influence of water immersion on the evolution of the groups and spontaneous combustion characteristics of coal samples with different sizes, raw coal from the Fengshuigou Coal Mine operated by Pingzhuang Coal Company in Inner Mongolia was studied. The infrared structural parameters, combustion characteristic parameters, and oxidation reaction kinetics parameters of D1−D5 water immersion coal samples were tested, and the mechanism of spontaneous combustion during the oxidation of submerged crushed coal was investigated. The results were as follows. The water immersion process promoted the re-development of coal pore structure, and the micropore volume and average pore diameter were 1.87−2.58 and 1.02−1.13 times those of raw coal, respectively. The smaller the coal sample sizes, the more significant the change. At the same time, the water immersion process increased the contact point between the active group and oxygen in the coal, and the C� O, C−O, and −CH 3 /−CH 2 − groups in coal were further promoted to react with oxygen to generate −OH functional groups and improve the reactivity of coal. The characteristic temperature of water immersion coal was affected by the temperature rise rate, coal sample size, coal voidage, and other factors. Compared with the raw coal, the average activation energy of the water immersion coal with different sizes decreased by 12.4−19.7%, and the apparent activation energy of the coal sample with a size of 60−120 mesh was the lowest on the whole. In addition, the apparent activation energy in the low-temperature oxidation stage was significantly different.

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Section: Resultsmentioning

confidence: 99%

Section: Functional Group Changes Inmentioning

confidence: 99%

Experimental Study on the Influence of Pore Structure and Group Evolution on Spontaneous Combustion Characteristics of Coal Samples of Different Sizes During Immersion

Guo

et al. 2023

ACS Omega

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“…These methods are straightforward and rapid to calculate [15]. In the 1930s, Valette introduced the concept of β = dT dt (heating rate) in the kinetic equations [16]. Therefore, the kinetic equation of the indefinite temperature and heterogeneous reaction can be written as:…”

Section: Methods and Formulasmentioning

confidence: 99%

Study of the Structure and Catalytic Activity of B-Site Doping Perovskite for an Inferior Anthracite Coal Combustion

et al. 2023

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The unique structure and physical properties of perovskite-type catalysts make them highly promising for catalyzing efficient coal combustion. Mesoporous perovskite LaNixFe1−xO3 (x = 0.2, 0.4, 0.6, 0.8) coal combustion catalysts were synthesized using the sol–gel method. The effects of the doping amount of B-site doped nickel on both the crystal structure and catalytic performance were investigated. X-ray diffraction, scanning electron microscopy, and nitrogen adsorption–desorption tests were used to characterize the catalyst samples. Thermogravimetric analysis (TG) and activation energy (Ea) calculations were used to assess the catalyst’s activity for the catalytic combustion of anthracite coal (JF coal, originating from Shanxi, China). Results revealed that nickel doping created lattice distortion and Ni-Fe alloy interactions. The difference in nickel doping significantly affects the morphology and catalytic activity of perovskite. The addition of LaNi0.6Fe0.4O3 (NI6) with a mass fraction of 5% resulted in the highest average burning rate value (va = 4.52%/min) of JF coal among all synthesized catalysts. The Ea of JF coal catalytic combustion, calculated using the Coats–Redfern method and the Doyle method, showed a good agreement with the TG curves. The LaNixFe1-xO3 series catalysts were found to significantly decrease the Ea of JF coal combustion, with a maximum reduction of 42% compared to the case without any catalyst added. Among the synthesized catalysts, NI6 exhibited a favorable catalytic combustion performance and is thus a promising candidate for the clean and efficient utilization of coal resources.

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“…For example, the evaporation time of water increases as the chemical reactivity of coal decreases. Therefore, it is better to use heat‐resistant sources that can increase the water content of the coal 19,35 …”

Section: Analysis Of Factors Influencing Coal Spontaneous Ignitionmentioning

confidence: 99%

“…Li et al 17 and Wang et al 18 simulated the temperature rise of oxidation of residual coal under high temperature in deep goaf to study the influences of different coal rock temperatures on the spontaneous combustion process thereof. By combining differential scanning calorimetry with programmed temperature rise, Zhang et al 19 estimated the influences of different water contents on the parameters of coal sample absorption and heat release. Although beneficial results have been achieved in the research on the influencing factors of spontaneous coal combustion, these factors are of numerous types, complex structures, and interrelated influences, and the dependence studies on various factors influencing spontaneous combustion of coal are insufficient 20,21…”

Section: Introductionmentioning

confidence: 99%

Dependence evaluation of factors influencing coal spontaneous ignition

Wu,

Yao,

Chen

et al. 2023

Energy Science & Engineering

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Coal spontaneous combustion is determined by a variety of factors. Testing can describe the changes incoal spontaneous combustion with various factors, however, the dependence of spontaneous combustion on various factors is unclear. Therefore, reliability theory was used to deduce the functional relationship of the dependence of coal spontaneous combustion on various factors, and construct a model algorithm for predicting the probability of occurrence of coal spontaneous combustion, which is adopted to evaluate and rank the degree of influence of various factors on coal spontaneous combustion. Effective prevention methods are proposed by strengthening the role of the most important factors. The results show that, by taking the duration of coal heating to 150°C as the measurement standard of coal spontaneous combustion, the duration of the initial stage of coal heating increases linearly with the increase of specific heat capacity, thermal conductivity, and moisture content of coal. With the increase of oxygen concentration, oxidation rate, and initial temperature of the coal, the duration of the initial stage of coal heating decreases exponentially. With the increase of gas flow seepage velocity in the coal body, the duration of the initial heating stage changes in a parabolic manner. At the same time, the probability of spontaneous combustion decreases exponentially with the increase of specific heat capacity and moisture content of the coal. The probability of coal spontaneous combustion increases linearly with the increase of coal thermal conductivity, oxygen concentration, gas seepage velocity, and rate of oxidation. The dependence of coal spontaneous combustion probability on different factors can be expressed as follows: coal temperature > gas seepage velocity > specific heat capacity > oxidation rate > oxygen concentration > moisture content > thermal conductivity.

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Experimental study and thermodynamic analysis of coal spontaneous combustion characteristics

Cited by 19 publications

References 27 publications

Experimental Study on the Influence of Pore Structure and Group Evolution on Spontaneous Combustion Characteristics of Coal Samples of Different Sizes During Immersion

Experimental Study on the Influence of Pore Structure and Group Evolution on Spontaneous Combustion Characteristics of Coal Samples of Different Sizes During Immersion

Study of the Structure and Catalytic Activity of B-Site Doping Perovskite for an Inferior Anthracite Coal Combustion

Dependence evaluation of factors influencing coal spontaneous ignition

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