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Introduction
Coal Spontaneous Combustion; Methane Explosion; Mine Rescue
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Publications
Publications (122)
Freeze–thaw (F–T) cycle-induced mechanical deterioration of mudstone layers in slopes is a critical challenge for the stability of slopes located in cold-regions open pit mines. Indoor F–T cycle experiments were initially conducted on mudstone samples obtained from the North Slope of the Fushun West Open Pit Mine. Furthermore, a constitutive model...
In addressing the issue of poor gas sensitivity in semiconductor CO sensor materials used in mining, such as pure PANI. This study utilized an ice‐water bath in combination with an in‐situ polymerization method to synthesize a new composite material consisting of Cu(II)‐racemic glutamate nanofibers and PANI. The morphology, structure, and chemical...
Multi-scale voids including fractures and bed separations will appear and dynamically develop as the underground mining-induced disturbance increases. The void fraction, which is an index for characterizing the void scale, is an important parameter for understanding the heat and mass transfer (including methane flow, coal spontaneous combustion, un...
Coal seam mining will lead to the movement and fissures of the overlying strata, which makes a complex void condition between the mining area and the ground surface. The void condition plays a key role in the occurrence and expansion of underground coal fires. In this study, the void rate model and the coupled thermal-hydro model of the underground...
Fire accidents caused by coal spontaneous combustion usually lead to a large loss of coal resources and casualties. Not only that, the greenhouse effect is polluted while the environment is polluted. At present, the commonly used fire-extinguishing materials such as water, inhibitors, and organic foams have the disadvantages of poor stability and s...
In order to solve the problem of formaldehyde release from the traditional phenolic foam (PF) in the process of coal mine filling and plugging. In this paper, the effect of different factors on the efficiency of formaldehyde trapping agents were studied by adding formaldehyde trapping agents containing amino compounds after PF synthesis. The effect...
Phase change microcapsules, which feature high latent heat and stability and can well mix with epoxy resin substrates, were synthesized through the solvent-free interfacial polymerization method with palmityl palmitate as the core material and low-toxicity dicyclohexylmethane 4,4′-diisocyanate as the shell material. The synthesized microcapsules we...
In previous research, many scientists and researchers have carried out related studies about the spontaneous combustion of coal at both the micro and the macro scales. However, the macroscale study of coal clusters and piles cannot reveal the nature of oxidation and combustion, and the mesoscale study of coal molecule and functional groups cannot b...
A highly dispersed melamine/red phosphorus (MA/RP) composite flame retardant was prepared by means of simple mechanical grinding. After co‐thermal pretreatment with polyether polyol (PPG‐2000) at 135°C, organic–inorganic hybrid foams (MA/RP/HF) containing MA/RP flame retardant were prepared by the one‐step method using main raw materials such as po...
Guansheng Qi Hao Hu Wei Lu- [...]
Wei Wang
To prevent coal spontaneous combustion and store CO2 in the coal mine, it is necessary to establish a fire-prevention pipeline transport system which continuously injects a large amount of liquid CO2 from the ground to the underground area directly. At present, few studies are focused on the law of liquid CO2 transport with great altitude differenc...
In order to improve the stability time and foaming ratio of gel foam, and change the traditional preparation method of gel foam. In this paper, using super-hydrophobic nanoparticles, PVA, sodium tetraborate and sodium bicarbonate as the main raw materials, based on the self-assembly effect of super-hydrophobic nanoparticles and hydrophilic macromol...
This work aims to is to study the flame propagation characteristics of the hydrogen/liquefied petroleum gas (LPG) premixed gas in a closed tube. With the aid of a self-developed square glass explosion tube and a high-speed camera, the characteristic parameters (i.e., flame structure, flame tip speed, maximum explosion overpressure, maximum rate of...
Highly paraffin/butyl stearate-loaded phase change microcapsules were synthesized by cosolvent-free interfacial polymerization using low-toxicity dicyclohexylmethane-4, 4′-diisocyanate as the shell material. The formation of the microcapsules and their distribution in the epoxy were studied by means of optical microscope and scanning electron micro...
In this paper, phase change microcapsules with excellent performance and stability were synthesized by interfacial polymerization by using tetradecyl octadecanoate (TO) as the core material, isophorone diisocyanate as the shell-forming monomer and modified boron nitride (BN) as the thermal conductive filler. The micro morphologies of unmodified BN,...
The automatic and effective identification of mine dust draws growing public concern for its universality and being highly hazardous to health and property. Based on improved methods for improved grayscale average (IGSA) and fractal dimension (FD) theory, a vision-based system that employs digital image processing was proposed to recognize dust par...
Fractures in the overburden induced by mining disturbances provide channels for heat-mass exchange between the subsurface environment and ground surface. Void fraction is an important characterization parameter to determine the difficulty of fluid flow and heat transfer. The three-dimensional stochastic distribution characteristics of the void frac...
The spontaneous combustion of coal restricts the development of green coal mining. Hydrogels are often used to air-leakage blocking and prevent the spontaneous combustion of coal, but traditional hydrogels suffer from poor adhesion. Therefore, to prevent the spontaneous combustion of coal and improve the utilization rate of hydrogels, this study pr...
The spontaneous combustion of coal seriously threatens the safe operation of coal mines. In order to solve the problems of the traditional inorganic solidified foam (TICF), i.e., a long gelation time, difficulty in uniform mixing, and low efficiency for blocking air leakage, a novel inorganic solidified foam (NICF) was proposed in this study to pre...
To overcome the problems of poor toughness and ease of cracking failure of inorganic spraying materials for gas sealing, this study proposes to modify traditional cement-based materials through the addition of slag, CaSO4 whiskers and MgO. The optimal composition of the high-performance sealing material (HPSM) was determined to be a mass ratio of s...
To address environmental damage, improve the efficiency of inhibitors in preventing the spontaneous combustion of coal, an antioxidant-type high-efficiency composite inhibitor was synthesized by solution polymerization. Using scanning electron microscope, water retention test, temperature programmed test, thermogravimetric and other experiments, th...
To combine the advantages of polymer gels and inorganic sodium silicate gels for preventing and controlling the spontaneous combustion of coal, a new type of SA/P/B/Ca (sodium alginate/non-ionic polysaccharide/inorganic boron crosslinking agent/calcium carbonate) gel was designed in this paper. Based on the ionic crosslinking reaction of sodium alg...
A kind of simple and efficient m-Cresol water-based inhibitor was proposed. The inhibitory effects of its solutions on the spontaneous combustion of different-rank coals were discussed. Furthermore, the micromorphology and wetting characteristics of different-rank coals were analyzed through a scanning electron microscope and a contact angle meter,...
Self-healing is an effective technique to prolong the service life of cement-based materials. In this study, the porous volcanic rock was used as the carrier to prepare the bio-capsules, and the waterproofness and storage stability of the bio-capsules were studied by weighing method. The influence of different dosage of bio-capsules on mortar stren...
Fire accidents caused by coal spontaneous combustion seriously affect the production safety of coal mines. Carbon monoxide (CO) is an important gas indicator used for monitoring and early warning detection of coal spontaneous combustion. Therefore, the development of CO sensors with low cost, low power consumption, and environmental protection is h...
With the potential safety hazard of coal spontaneous combustion becomes more and more serious, in order to solve the problems of low water absorption rate and high cost of hydrogel inhibitor, in this study, a superabsorbent lignin-based composite inhibitor (SAP + SLS + Ben) was prepared. The water absorption/retention rate, micromorphology, inhibit...
Coal mine fires, which can cause heavy casualties, environmental damages and a waste of coal resources, have become a worldwide problem. Aiming at overcoming the drawbacks, such as a low analysis efficiency, poor stability and large monitoring error, of the existing underground coal fire monitoring technology, a novel monitoring system based on non...
In this study, the explosion behaviors of H2-LPG-air mixtures with 30% H2 fraction under the action of N2 and CO2 were experimentally investigated respectively under the initial conditions of 1 atm and 298 K. Furthermore, the mole fraction and the rate of production (ROP) of free radicals were analyzed with reference to the detailed USC-Mech II mec...
Endowing concrete with self-healing properties is one of the effective methods to improve its durability. In this study, biocapsules and mineral capsules were premixed in cement mortar and cured in wet dry cycles and simulated underground space environment. The self-healing performance of cement-based materials in underground engineering, especiall...
This study is aimed at investigating the effects of substituent positions and types on the activities of phenolic inhibitors for inhibiting coal spontaneous combustion (CSC). To achieve this aim, six phenolic inhibitors with different substituent positions (ortho-, meta- and para-) and types (methyl, ethyl, isopropyl and tert butyl) were selected f...
To improve the efficiency of inhibitors in preventing the spontaneous combustion of coal, an antioxidant-type high-efficiency composite inhibitor (SAP + MLT + Ben) was synthesized by solution polymerization. Scanning electron microscopy, Fourier transform infrared spectra, Electron spin resonance, and programmed temperature experiment were employed...
For a thermochemical energy storage (TCES) system, the fluid flow, heat and mass transfer, and reaction kinetics in packed bed reactors are closely related to the packing structure, which is crucial for charging/discharging performance. This study presented a spatially resolved 2D model to investigate the effects of packing structure on the dischar...
Grouting filling materials into a goaf is a necessary step for goaf disaster prevention and control. This study is aimed at developing a process and method of rapid and low-cost CO2 mineralization with alkaline waste. The effects of various factors, including stirring speed, pressure, solid-liquid ratio and slurry entry speed, on mineralization deg...
To prevent dust pollution on road surfaces near open-pit mines in northwest China, this paper prepared a dust suppressant inspired by mussel adhesion proteins, which are rich in phenolic hydroxyl groups and lysine residues. The source of the adhesion of the dust suppressant was proven through adhesion tests. In addition, by analyzing the dust suppr...
Coal fires have led to severe ecological disasters worldwide and threatened the health and safety of nearby residents to a certain extent. It is critical to detect the scope and extent of coal fires in order to control and extinguish them. In this article, the unmanned aerial vehicle (UAV), thermal infrared imaging, and oblique photogrammetry techn...
Since coal oxidation and heat accumulation are prerequisites for coal spontaneous combustion, it is of great significance to study the characteristics of coal oxidation and heat accumulation to grasp characteristics of spontaneous combustion of residual coal and to locate the area with coal spontaneous combustion in goaf. In this study, three types...
The present paper proposes a method for quantitatively identifying the chemical inhibition effect of the inhibitor and aims to reveal the influence of raising the pre-inhibition temperature on chemical inhibition. To be specific, first, the coal samples inhibited with the halogen salt inhibitor and the water-soaked coal samples prepared at differen...
The effects of hydrogen addition on the explosion characteristics of liquefied petroleum gas (LPG)-air mixtures were experimentally investigated under initial conditions of 1 atm and 298 K. Furthermore, with reference to the detailed USC-Mech II mechanism, sensitivity and the rate of production (ROP) analyses were conducted. When the hydrogen propo...
To explore the influence of the CO2 volume fraction on methane explosion in confined space over wide equivalent ratios, the explosion temperature, the explosion pressure, the concentration of the important free radicals, and the concentration of the catastrophic gas generated after the explosion in confined space were studied. Meanwhile, the elemen...
To reduce the effect of conventional halogen salt inhibitors on the performance of foaming solutions and extend the fire prevention and suppression time of water-based foams, herein, microencapsulation technology has been used in the preparation of inhibitors. Calcium chloride sustained-release microcapsule with ethyl cellulose as wall material was...
In order to understand the evolution of the structure–property relationship between the crosslink density and mechanical properties of polyurethane-urea/sodium silicate (PU/SS) hybrid composites, a series of PU/SS composites with 2.5 wt% organofunctional silanes and pure PU/SS composites are investigated at different curing time. Mechanical propert...
In this study, we develop a fully coupled thermal-hydrological-mechanical-chemical (THMC) model to analyze the spontaneous combustion process of underground coal seams, focusing on investigating the influences of the pressure difference between oxygen and coal, the rate of coal-oxygen reaction heat, and the activation energy. The simulation results...
The present paper proposes an intumescent flame-retardant, which is suitable for the entire process of spontaneous combustion of coal. Scanning electron microscopy (SEM), simultaneous thermal analysis, in situ FTIR, and temperature programmed experiment were adopted to analyze its inhibiting effect and mechanism. The results indicate that the flame...
Developing a material that efficiently prevents spontaneous combustion of coal and can extinguish fire remains challenging. This research developed a gel foam that integrates the advantages of three fire-extinguishing technologies (i.e., foam, gel, and inert gas). The resistance and fire-extinguishing performance of this material were studied. The...
To explore the influence of the CO 2 volume fraction on methane explosion in a confined space over wide equivalent ratios, the explosion temperature, the explosion pressure, the concentration of the important free radicals, and the concentration of the disastrous gas generated after the explosion in a confined space were studied. Meanwhile, the ele...
Aiming at solving the problem of coal spontaneous combustion during coal mining, a new type of antioxidant gel foam for coal mine fire prevention and control was proposed. The gel was prepared by introducing procyanidins into the gel system (sodium silicate / coagulant / bentonite). By testing the gelling time and water retention rate of the antiox...
Aiming at the problems of poor strength, prone cracking, and low gas sealing efficiency of traditional clay-cement composite gas-sealing materials (CCC), a new type of clay-cement based spraying material of gas sealing (XM-CCC) modified by xanthan gum (XG) and magnesium oxide (MgO) was prepared. Through water separation proportion test, slurry time...
Hybrid reinforced sodium silicate/polyurethane (SS/PU) composites mainly derived from low-cost SS and polyisocyanate are produced by a one-step method based on the addition of 3-chloropropyltrimethoxysilane (CTS). The wettability of SS on PU substrate surface is much improved as CTS content increases from 0.0 to 3.5 wt%. Furthermore, with 2.5 wt% o...
Hybrid reinforced water glass/polyurethane-urea (WG/PU) composites mainly derived from low-cost WG and polyisocyanate are produced in the presence of 3-chloropropyltrimethoxysilane (CTS). The wettability of WG on PU substrate surface is significantly improved as CTS content increases from 0.0 wt% to 3.5 wt%. Furthermore, with 2.5 wt% of CTS optimal...
A majority of coal mines in China are susceptible to fires, especially those affected by concealed fire sources in coalfield fire areas. Hence, to mitigate this problem, the efficient and precise detection of high-temperature anomalous areas is significant and needed, which mainly involves determining the range and depth of concealed fire sources....
A novel composite inhibitor based on porous mineral materials and conventional flame retardant of ammonium polyphosphate (APP) is prepared to suppress the premixed methane/air explosion. Taking advantages of gas and powder inhibitor, N2 and the prepared composite inhibitor are combined to use. The suppression performance of N2-composite inhibitor o...
The spontaneous combustion of residual coal in coal mine gob has long been a problem and poses a threat to the safe production of coal. Therefore, it is of great significance to conduct an in-depth study of the oxidation and self-heating progress of residual coal in the gob. Considering that the geometric dimensions and physical characteristics of...
In contrast to the Rayleigh waves, the system of SH- and Love-wave Full-Waveform Inversion (FWI) is simpler (Only S-wave velocity and density is inverted). However, the gradient is not scaled with the increasing depth in gradient-based FWI. The main reasons for the phenomenon are the limited frequency band of the wavelet, non-uniform coverage of th...
Microcapsules containing isophorone diisocyanate were fabricated in oil-in-water emulsion. The emulsification effect of different emulsifiers during the capsule synthesis was systematically investigated by optical microscope. Three kinds of shell materials were discussed to obtain the high core content, smooth-surfaced, and robust capsule by scanni...
Since the CO2/CO ratio was found to be unaffected by the ventilation flow rate, it is an excellent tool to evaluate the state of coal spontaneous combustion. However, the existing studies generally regard coal-oxygen reaction as a total package reaction, which leads to the mutual interference of CO2/CO produced by pure oxidation, pyrolysis and phys...
The extemporaneous combustion of coal remains a major threat to safety in coal mines because such fire accidents result in casualties and significant property loss, as well as serious environmental pollution. This work proposed the fabrication of flame-retardant rigid polyurethane foam (RPUF) containing expandable graphite as char expander/sealant...
Caprocks play an important role in the trapping of coalbed methane (CBM) reservoirs. To study the sealing capacities of caprocks, five samples with different lithologies of Neogene clayrock, Paleogene redbeds, Permian sandstone, Permian mudstone and Permian siltstone were collected and tested using experimental methods of microstructure observation...
Spontaneous combustion of coal has long been a thermal dynamic hazard during coal mining, storage, and transport, posing a great threat to coal mine safety. Especially coal spontaneous combustion in longwall goaf poses a great threat to underground working crew. To investigate such a mine safety issue with more insights and “what if” scenarios, thi...
Spontaneous combustion of coal in underground coal mine is a long-standing thermal dynamic hazard. The hazard is harmful in diverse aspects: causing loss of coal resource, raising safety concerns, and giving off noxious/greenhouse effect gases. Detection and trending analysis of a few particular gaseous products liberated during coal oxidation is t...
Thinning is an iterative process which erodes an object layer by layer until only a 'skeleton’ or ‘medial axis’ of the object remains. A medial axis with high quality lays the foundation for quantifying a porous structure under a pore scale, which has a major effect on many engineering processes and applications. In this study, an algorithm was dev...
Addressing the problem of baseline drift or distortion in Fourier transform infrared spectra when analyzing gas continuously at scene, a novel and simple method is proposed to identify and treat spectral baseline drift. Firstly, the spectral baseline was corrected with the common approach followed by standard gas analysis. Then, absorbance of analy...
A novel analytical solution, which included the effects of temperature distribution and oxygen concentration distribution on coal self-heating system, was presented. It was derived by combining the travelling wave reduced form method and the intermediate variable method. Coal self-heating results were consistent between theory and experiments. Usin...