Three stages of spontaneous combustion of gangue mountain 2024

Study on Pyrolysis and Oxidation Characteristics of

2024年3月15日  As shown in Table 3, the oxidative spontaneous combustion process of gangue can be divided into five stages, ie, water evaporation and degassing (phase I), oxygen absorption dynamiting (phase II), heating 2022年10月13日  The spontaneous combustion of coal gangue mountains results from the combined action of temperature field, gas concentration field, seepage velocity field, and chemical reaction; among them, the exothermic Numerical Simulation of the Dynamic Change Law of 2024年11月7日  The spontaneous combustion of coal gangue hills is accompanied by the release of toxic gases and the infiltration of metal elements, posing a serious threat to the Investigation on spontaneous fires regions in coal gangue hills The coupled threefield model of spontaneous combustion of coal gangue mountain was established The internal thermal behavior of coal gangue mountain is analyzed by using CFD A study on the thermal behavior of coal gangue mountains under

Numerical Simulation of the Dynamic Change Law of Spontaneous

2022年10月13日  In addition, the dynamic development law of these three physical fields in the process of spontaneous combustion is numerically simulated, and the relationship between To further study the problem of spontaneous combustion of coal gangue mountains, a multifield coupled simulation model was established based on the mathematical models of temperature field,Mechanism of spontaneous combustion of coal In addition, the dynamic development law of these three physical fields in the process of spontaneous combustion is numerically simulated, and the relationship between gas Numerical Simulation of the Dynamic Change Law of Spontaneous 2024年11月7日  When S = 3 m and D = 7 m, the spontaneous combustion volume and highest point temperature of coal gangue dumps were reduced by 3975% and 4668%, respectively, Influence of heat pipe layout parameters on the cooling effect of

Theoretical model for spontaneous combustion gangue coarse

2024年2月1日  The results show that the axial loadnominal axial strain curves of all SCGCACFST specimens exhibit three stages, including an approximately linear ascending part gelfoam to control spontaneous combustion of coal gangue32 To prevent spontaneous combustion of coal gangue dumps, Tang and Wang developed a type of bentoniteacrylamide superabsorbent hydrogel, which can be used for cooling, controlling combustion, and preventing coal gangue from reburning33 To overcome the short inhibition life of currentlyDetection of Spontaneous Combustion Areas of Coal Gangue 2024年1月27日  Spontaneous combustion coal gangue (SCCG) is considered to be an aluminosilicatebased solid waste containing various toxic ions The alkaliactivation method for this material can not only fully use its potential hydration Solidification Behavior of Heavy Metal Pb2+ for toxic and harmful gases but also easily cause gangue mountain collapses, blowouts, and explosions4−6 Therefore, it is necessary to analyze the nature and thermal effectof gangue pyrolysis and oxidative combustion process in the whole and at all stages, so as to reveal the spontaneous combustion mechanism of the gangue reaction process and to Study on Pyrolysis and Oxidation Characteristics of Coal Gangue

Experimental and theoretical study on kinetic behaviour of coal gangue

2020年10月29日  Coal gangue (CG) and raw coal (RC) can catch fire due to spontaneous combustion The combustion characteristics, functional groups, and kinetic behaviour of CG and RC were investigated to assess their thermal stability characteristics using thermogravimetric/Fourier transform infrared techniques (TG/FTIR) at heating rates of 10, 20, 2021年3月2日  In this study, an experimental model about the coal gangue stockpiles in semiopen storage was developed According to the model’s requirements, the corresponding coal gangues were piled up in the factory building, the heat source and collection points were arranged, and the four operating temperatures were selected from 70 to 350 °C for heating A Experimental investigation of temperature distribution and spontaneous 2021年8月25日  Spontaneous combustion of coal gangue dumps not only releases toxic and harmful gases, polluting the environment, but also leads to explosion accidents and casualties due to improper handlingStudy on Spontaneous Combustion Characteristics of Waste Coal Gangue 2023年12月8日  Spontaneous combustion of coal gangue dumps not only releases toxic and harmful gases, polluting the environment, but also leads to explosion accidents and casualties due to improper handling This paper focuses on delineating the fire area, constructing a comprehensive fire prevention and extinguishing system, and restoring the ecological Detection of Spontaneous Combustion Areas of Coal Gangue

Study on Thermodynamic Characteristics and Heat Transfer

2022年8月26日  Study on Thermodynamic Characteristics and Heat Transfer Method of Uncontrolled Fire in Coal Mine Gangue Mountain Spontaneous Combustion Based on System Dynamics2024年11月7日  The influence of the insertion spacing of HPs on the spontaneous combustion volume of coal gangue dumps is greater than the influence of the insertion depth of HPsInfluence of heat pipe layout parameters on the cooling effect of Coal gangue is a byproduct of coal mining, constituting approximately 15 % of the total raw coal output [1]Over the past few decades, coal has become the primary energy source in China, resulting in the accumulation of 5 billion tons of coal gangue, with an additional 300 to 350 million tons generated annually [1]Spontaneous combustion coal gangue is a widely occurring type Spontaneous combustion coal ganguebased composite 2024年1月17日  A total of 40 fiber reinforced polymer (FRP) and polyvinyl chloride (PVC) confined spontaneous combustion gangue coarseaggregate concrete (SAC) specimens were subjected to axial compression tests Stress–strain characteristics of FRP–PVC confined spontaneous

Study on controlling factors and developing a quantitative

2024年2月1日  To date, a considerable amount of research has been conducted on the mechanism, influencing factors, and prevention and control of spontaneous coal gangue combustion [[10], [11], [12], [13]]It is generally accepted that the spontaneous combustion of coal gangue is due to both pyrite and coal organic components2024年2月1日  Scholars have carried out extensive research on the combustion process of coal and coal gangue In the study of the micromechanism of spontaneous combustion，Wang et al [12] explained the chain reaction mechanism of 12 key free radicals during coal spontaneous combustionChen et al [13] constructed a cycle model of free radicals during coal Study on the thermal reaction characteristics and kinetics of coal 2023年4月7日  The serious environmental pollution caused by the spontaneous combustion of coal gangue has become a problem which cannot be ignored in the world mining industryTemperature Distribution Regularity and Dynamic Evolution of The cospontaneous combustion of coal and gangue widely exists in the world and threatens the safety of coal mines In this paper, the microstructure of coal and gangue were tested and the thermal behavior during the cospontaneous combustion process of coal and gangue with different mass ratios were investigated by using synchronous thermal analyzer, and the Cospontaneous combustion of coal and gangue: Thermal

Study on Spontaneous Combustion Characteristics of Waste Coal Gangue

2021年8月25日  Due to the continuous heating by the heat generated at the depth of 25 m and the sufficient conditions of oxygen supply and heat storage, the coal gangue at the depth of 15 m was ignited The spreading trend of spontaneous combustion was from the fire source (25 m deep) to the outside of the gangue hill (15 m deep)2024年1月30日  1 Introduction China is a dominant producer and consumer of coal, and coal energy plays a leading role in the energy structure of China According to the National Bureau of Statistics, although the coal energy proportion has shown a downward trend in recent ten years, the proportion of coal energy structure is still more than 55%Crack Propagation Phenomenon in Gangue Concrete Using the To further study the problem of spontaneous combustion of coal gangue mountains, a multifield coupled simulation model was established based on the mathematical models of temperature field, gas Mechanism of spontaneous combustion of coal gangue 2024年10月17日  The outer surface of the oxidation zone is 1 1 ~ 1 4 meter s away from the slope of the coal gangue mountain，and the inner surface is 3 1 ~ 10 2 meters away from the slope of the coal gangue moun tain Key words：coal gangue mountain；“Three Zones”of spontaneous combustion；air seepage field；oxygen con centration field2 Study on distribution law of “Three Zones”of spontaneous

(PDF) Study on Pyrolysis and Oxidation Characteristics of Coal Gangue

2024年3月15日  Coal gangue spontaneous combustion has caused serious environmental and ecological problems To investigate the reaction kinetic parameters of the gangue and the exothermic characteristics of the 2021年8月25日  ABSTRACT In order to provide theoretical guidance for controlling spontaneous combustion in coal gangue hills, this study investigated the characteristic of spontaneous combustion The variations of temperature at different depths were obtained through arranging temperature measurement boreholes in the coal gangue hill and observing for 30 days The Study on Spontaneous Combustion Characteristics of Waste Coal Gangue 2023年11月1日  DOI: 101016/jconbuildmat2023 Corpus ID: ; Experimental and analytical model of CFRPconfined spontaneous combustion coal gangue aggregate concrete @article{Guan2023ExperimentalAA, title={Experimental and analytical model of CFRPconfined spontaneous combustion coal gangue aggregate concrete}, author={Hongbo Guan and Jitao Experimental and analytical model of CFRPconfined spontaneous 2022年10月13日  To further study the problem of spontaneous combustion of coal gangue mountains, a multifield coupled simulation model was established based on the mathematical models of temperature field, gas Numerical Simulation of the Dynamic Change Law of

Research on the fire extinguishing performance of new gel foam

2023年7月12日  Coal gangue, as an associated product of coal mining, can cause a large number of piles to undergo slow oxidation and spontaneous combustion, resulting in the production of toxic and harmful gases, leading to casualties, environmental damage, and economic losses Gel foam has been extensively employed as a fireretardant material in coal 2009年11月10日  In order to explore the reason for the frequency explosion of spontaneous combustion coal gangue dump and get to know their explosion mechanism, established the experiment platform about spontaneous combustion coal gangue dump interoperable water The gangue dump was heated using the external heat source, and rainy weather through water Experimental study on explosive mechanism of spontaneous combustion 2018年9月1日  At different spontaneous combustion temperatures, the amount of PAHs generated generally increased with the volatile content, sulfur content, carbon content, fixed carbon content and calorific value of coal and gangue, but decreased with the increase of ash contentThe amount of PAHs produced by coal spontaneous combustion was generally higher Characteristics of polycyclic aromatic hydrocarbon release h Assessing Potential Spontaneous Combustion of Coal Gangue

Experimental and mesoscopic simulation study of size effect on

2024年9月1日  Due to the distinct porous structure and fibrous material content of spontaneouscombustion coal gangue [10, 16], significantly different from those of natural aggregates, spontaneouscombustion coal gangue coarse aggregates (SCGA) exhibit elevated crushing values [11], diminished secant moduli [12], increased water absorption rates, and enlarged 2024年11月8日  The exposed accumulation of coal gangue undergoes changes when it is soaked by rainwater, exhibiting varying tendencies for spontaneous combustion in different precipitation regions This study investigates the effects of moisture on the oxidation and spontaneous combustion of coal gangue in highsulfur coal gangue from the Qipanjing area of Study on Natural Characteristics of Coal Gangue Oxidation under 2018年1月1日  The precise division into “three zones” of coal spontaneous combustion in the gob plays a key role for coal fire fighting This paper presents threedimensional distribution maps and contour plots for the gases and temperature in the gob by the method of griddata interpolation according to the data (O 2, CO, CO 2, CH 4, and temperature) acquired from insitu test, and Determination and prediction on “three zones” of coal spontaneous 2022年11月30日  ABSTRACT To determine the effect of water contents on the oxidation spontaneous combustion of coal gangue, the properties and combustion characteristics of coal gangue were studied using industrial and elemental analyses and Thermo GravimetryDifferential Scanning Calorimetry (TGDSC) The molecular dynamics simulation (MDS) and giant regular Experimental study and molecular simulation of spontaneous combustion

Research regarding the influence of size on the compressive

2024年8月1日  This study presents a deep learning diffusion model [23] grounded in computer vision, as a response to the challenges of constructing microscale models and the research need to investigate concrete size effects This methodology employs a profound learning network (U 2Net) [24] and a randomly deployed collective repository [25] to generate a dataset, which is 2023年12月8日  Spontaneous combustion of coal gangue dumps not only releases toxic and harmful gases, polluting the environment, but also leads to explosion accidents and casualties due to improper handling This paper focuses on delineating the fire area, constructing a comprehensive fire prevention and extinguishing system, and restoring the ecological Detection of Spontaneous Combustion Areas of Coal Gangue combustion gangue involving the process of spontaneous combustion, with sulde and nitride emissions through combustion Its stability is far better than nonspontaneous combustion gangue 9,10 Stress–strain characteristics of FRP–PVC confined spontaneous 2024年5月20日  The spontaneouscombustion coal gangue concrete (SCGAC) demonstrates different mechanical behavior compared to ordinary concrete owing to its distinct porous structure and the presence of fibrous Experimental and Mesoscopic Simulation Study of Size Effect on

Numerical Simulation of the Dynamic Change Law of Spontaneous

2022年10月13日  To further study the problem of spontaneous combustion of coal gangue mountains, a multifield coupled simulation model was established based on the mathematical models of temperature field, gas concentration field, and seepage velocity field In addition, the dynamic development law of these three p 2020年12月5日  Therefore, the main purposes of this paper were to: (1) acquire the thermal behaviors and combustion properties of CG through TG technique; (2) propose the correlations for thermophysical properties of CG using the experimental data at the initial stage of spontaneous combustion; and (3) analyze correlations and sensitivity analysis of thermal Experimental study of thermophysical properties of coal gangue Cite this: RSC Adv,2024,14,19301 Received 28th April 2024 Accepted 29th May 2024 DOI: 101039/d4ra03151b the gangue is divided into four stages, which shows that the spontaneous combustion of the coal gangue can be controlled by controlling the pressureMolecular simulation of CO production and adsorption in a coal 2020年9月20日  Spontaneous combustion gangue aggregates (SCGAs) have inferior qualities compared with natural aggregates (NAs) The aim of this study is to investigate the effects of the replacement (r SCGA) ratio and particle size distribution of coarse SCGAs on the mechanical properties of concrete, as well as to propose prediction methods for coarse SCGA concreteMechanical properties of concrete with coarse spontaneous combustion

Study on Thermodynamic Characteristics and Heat Transfer

2022年6月15日  spontaneous combustion of coal gangue mountain, based on the research idea of “heat transfer and cooling,” the prevention and control methods are carried out focusing on the kinetic characteristics of uncontrolled spontaneous combustion and heat transfer process of coal gangue mountain †e scienti­c management of ­re has important

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