Showing papers on "Spontaneous combustion published in 2021"
TL;DR: In this article, a method to calculate the key parameters of coal oxidation reaction based on temperature-programmed tests was proposed, and a one-step global numerical model for exploring coal oxidation considering the effects of multi-component material was established.
71 citations
TL;DR: In this paper, the exothermic behavior of weathered coal on low-temperature oxidation was investigated in fresh and Weathered coal during spontaneous combustion using the laser flash technique.
64 citations
TL;DR: In this article, the effects of particle size on gases emitted from weathered coal under high-temperature oxygen deficiency were investigated, and the results revealed the different experimental phenomena of the coal sample of each particle size.
59 citations
TL;DR: In this paper, a fracture-pore evolution model of goaf is constructed, the pore evolution and porosity distribution in a goaf overburden are simulated by the distinct element modeling software Particle Flow Code (PFC).
47 citations
TL;DR: In this paper, a long-term water-immersed coal sample for nearly seven years was selected, and low-temperature oxidation and crossing point temperature tests were first analyzed, which indicated that water immersed coal was more prone to oxidation and spontaneous combustion.
45 citations
TL;DR: Wang et al. as discussed by the authors analyzed the characteristics of gas and gas ratio variation with coal temperature, screened out the characteristic gas indexes of coal spontaneous combustion in Tangjiahui Mine, and defined six characteristic temperatures and their threshold values.
43 citations
TL;DR: In this article, the influence of antioxidants on coal properties and SPONCOM liability of coal samples collected from South African coal mines was investigated, and gypsum, which has been used for the first time, proves to be an economically viable option compared to other antioxidants on both laboratory and medium scale tests.
43 citations
TL;DR: In this paper, the influence of different FeS2 contents on the microstructure and spontaneous combustion characteristics of coal, TG-DSC-FTIR, chromatographic oxygen absorption experiments and scanning electron microscopy were used to study the variation characteristics of parameters such as the TG-DSC curve, characteristic temperature, functional group, activation energy and surface structure of coal samples with different FSS2 contents.
35 citations
TL;DR: In this paper, the influence of long-term water immersion on the spontaneous combustion characteristics of coal, temperature-programmed test system and In-situ Fourier transform infrared spectroscopy were used.
34 citations
TL;DR: In this article, the process of spontaneous ignition of hydrogen flames at laminar, turbulent, adiabatic and non-adiabatic conditions was investigated and a quantitative characterization of the instantaneous fuel consumption rate within the reaction front was obtained.
32 citations
TL;DR: In this article, the authors used thermogravimetric analysis to obtain the pyrolysis and combustion characteristics of corn straw powder, poplar wood chip and rice husk in nitrogen and air, respectively.
TL;DR: Wang et al. as discussed by the authors analyzed the changing rules of coal temperature, O2 and CO during spontaneous combustion of coal under pure oxygen adiabatic conditions, and proposed a method for calculating oxygen consumption rate during coal spontaneous combustion.
TL;DR: In this article, a three-dimensional model of coal spontaneous combustion in shallow coal seams is established, and the correctness of the model is verified by on-site measured data, which has a quadratic functional relationship with the surface air leakage.
TL;DR: In this article, a back propagation neural network (BPNN) was proposed to simulate coal spontaneous combustion under six factors, including activation energy, void fraction, moisture content, air flow rate, stacking time and location of measuring point.
TL;DR: In this article, an intumescent flame-retardant was proposed for the entire process of spontaneous combustion of coal, which is suitable for the whole process of coal oxidation and decomposition.
TL;DR: In this paper, a pollution-free fire-retardant foam with high foam expansion and good stability was proposed to suppress coal spontaneous combustion effectively for a long time and to put out fire quickly.
TL;DR: In this paper, the authors compared five different kinetic analysis methods and found that the Kissinger-Akahira-Sunose (KAS) method is more accurate and is highly recommended.
TL;DR: In this paper, the effect of microcapsules with different core-to-wall ratios on the characteristics of coal spontaneous combustion was studied, and the results showed that microcapsule material can reduce the weight loss rate and heat release of coal, increase the critical temperature and maximum loss rate temperature by 8.8 and 33.6 °C, respectively, and increase the apparent activation energy of water evaporation and gas desorption stage.
TL;DR: In this paper, the authors proposed that electric sparks generated by the piezoelectric effect of a coal seam roof ignites goaf gas to cause disasters, which is the main component of roof sandstone.
TL;DR: In this paper, the authors used the Achar and Coats-Redfern methods to resolve thermal combustibility (as reflected by comprehensive combustibility index [Sn] and kinetic properties) for three types of coal (S1-BN, S2-CY, and S3-JM) through thermal analysis.
TL;DR: In this paper, the effects of triangle obstacles inside the tube on the ignition mechanism and subsequent flame development in a semi-confined space when high-pressure hydrogen sudden release was studied.
TL;DR: In this paper, the authors analyzed the initiation mechanism of gas-solid mixture through coal spontaneous combustion in goaf and showed that the role of coal dust volatiles in homogeneous and nonhomogeneous reactions leads to a lower explosion limit for CH4/air.
TL;DR: The evaluation method and model have been proposed to describe the underground combustion and the related air pollution of coal fire air pollution, and it is noted that thermophysical indicator performs outstanding explanatory for contaminant variates.
TL;DR: In this paper, a mixture of anionic surfactants and organic polymer (OP) material was used to prepare a foam system with high stability and water-retention characteristics.
TL;DR: In this article, a coal sample from Xishan coalfield in China was used to conduct the low-temperature oxidation experiments under different lean-oxygen environments and the experimental results showed that different leanoxygen environment had a significant delay effect on the formation of CO, CO2, H2 and C2H6, and the lower the O2 concentration, the more obvious the delay effect.
TL;DR: In this article, three types of lignite and bituminous coal with a strong spontaneous combustion tendency were selected to prepare raw coal samples and aerobic heated coal samples, respectively, and the ultimate and proximate test, core pore and surface area test, SEM test, TG test, FTIR test and temperature-programmed test were undertaken, respectively.
TL;DR: In this article, the authors studied the evolvability and spontaneous combustion characteristics of coal in the presence of high temperature, and found that high temperature causes thermal damage to coal, alters its pore-fracture structure, and then influences its permeability.
Abstract: High temperature causes thermal damage to coal, alters its pore-fracture structure, and then influences its permeability and spontaneous combustion characteristics. In this paper, to study the evol...
TL;DR: In this article, a low-temperature oxidation experiment of coal under axial stress loading conditions was conducted, and the effect of axial stresses on spontaneous combustion of coal was investigated.
TL;DR: In this article, a self-designed experimental platform was applied to investigate the methane migration process induced by the spontaneous combustion of coal, and the effect of temperature, and range of coal spontaneous combustion on the methane distribution was studied.
TL;DR: In this article, a novel biomass composite thermoresponsive gel produced by mixing konjac glucomannan (KGM) with fly ash (FA) was prepared to prevent coal spontaneous combustion.