Research On Macro Featured Parameters And Test Methods Of Coal Spontaneous Combustion Character

Spontaneous combustion severely threatens production safety of coal mine, in recentyears, quantitative characterization and hazard degree judgment of coal spontaneouscombustion characteristics become hot and difficult point of coal production safety research.According to coal spontaneous combustion characteristic parameters, based ontheoretical research on coal-oxygen adsorption and spontaneous combustion characteristics,main macro characterized parameters of coal spontaneous combustion is determined. Thekilogram-level coal spontaneous combustion experiment stove of smallest content is designedand established, new method for coal spontaneous combustion tendency and period test israised.Through experiment test and analysis of Huangling coal sample2#, the macrocharacterized parameters of coal spontaneous combustion is determined, as well as standardexperimental condition. By comparison with large-scale coal spontaneous combustion andtemperature programed experiment, the new experimental device combines the advantages ofboth experiment, which can rapidly and accurately determine features of macro characterizedparameters of coal spontaneous combustion, and provides theoretical and experimental basefor determing coal spontaneous combustion character and period. The main creative are asfollows:（1）According to coal pore structure, type of absorption and heat relationship of coal tooxygen, the function of different type of absorption in oxidation and self-heating at lowtemperature is analyzed. Based on coal spontaneous combustion law and test methods, thefluid mechanics in porous medium, heat and mass transfer theories and related mathematicalmodels are used, the critical parameters of numerical calculation in coal oxidation andself-heating process are determined, including: oxygen consumption rate, heat releaseintensity, which provides theoretical support for coal spontaneous combustion characterizedparameters test.（2）Based on exothermic and conductive character of crushed coal, the experimental condition is analyzed, including coal amount, adiabatic condition, control accuracy andrelated hardware and software. The kilogram-level coal spontaneous combustion experimentstove of smallest content is established, the heat released from device satisfies the condition ofcoal oxidation and temperature increase，the simulation of7.1kg coal sample spontaneouscombustion process is realized，related problems are solved，including huge workload,external heating and veracity of simulation.（3）Huangling coal sample2#is tested by kilogram-level coal spontaneous combustionexperiment stove, relation between gas and temperature change in process is raised.Combining featured parameter, such as index gas concentration and changing rate, gasconcentration ratio, with coal temperature, three characteristic temperature value in coalspontaneous combustion process are determined, according to quantitative criterion,quantitatively recognizing conceal fire temperature of coal spontaneous combustion by indexgas is realized.（4）Based on kilogram-level coal spontaneous combustion experimental test, thefeatured parameter of Huangling coal sample2#is calculated, including heat release intensity,oxygen consumption rate, and experimental coal spontaneous combustion period. Thefunctional relation between macro featured parameters and temperature during coal-oxygencomposite is fitted, the constant term is determined, which provides key parameter fornumerical simulation and period calculation of coal spontaneous combustion.（5）Through comparison with experiment of large amount (Xi’an university of scienceand technology XK-III) and temperature-programed experiment, it indicates thatkilogram-level coal spontaneous combustion experiment can be used for coal spontaneouscombustion test, coal spontaneous combustion featured parameter accurate determining, aswell as coal spontaneous combustion tendency, which is important for forecast and hazardjudging of coal spontaneous combustion.