Study On The Combustion Characteristics Of Coal Seam Outcrop In The Influence Of Natural

The coalfield fire is generally by coal seam outcrop fire the first cause, the emergence anddevelopment of coal seam fire must have good ventilation conditions, the general is under theinfluence of natural ventilation in the autonomous development of coal combustion. Therefore forcoal seam outcrop and inducing roof take produce colonies collapse of the three zones ", coal seamoutcrop in under the influence of natural ventilation combustion characteristics of research and ofscientific analysis of coal seam outcrop fire combustion process, do a good job of coalfield firecontrol, coal resources and to the ecological environment protection, is of great significance.According to the investigation of outcrops of fire of coal seam outcrop as the research object,through theoretical analysis, experimental research and numerical simulation of a combination ofmethods of coal seam outcrop fire in under the influence of natural ventilation combustioncharacteristics were studied. First of all, the use of replenishment law of coal seam outcrop firesubsidence area formed by porous media porosity were measured experimentally, determination ofsubsidence porous media porosity in the range between0.35to0.45and porosity and permeabilityof the relationship between the type of "three zones" in the coal seam outcrop fire. Secondly, the useof production of coal seam outcrop similarity simulation experiment device for the combustionprocess of the coal seam outcrop of laboratory experiments, the coal combustion and time, coalcombustion temperature and disaster after gas oxygen content and coal combustion heat release rate.Again, the fire area of related theories and research zone geological data to establish coal seamoutcrop fire physical model and mathematical model and the analysis to determine the boundaryconditions of the coal seam outcrop of ventilation system in power system and its model. Finally,using FLUENT software to coal seam outcrop fire fire numerical simulation and the results of theanalysis to obtain the variation of coal seam outcrop fire temperature field and air leakage flow fieldand pressure field, and then grasp the outcrop coal combustion process of general rules; andaccording to the fitting results prove the gas in coal seam outcrop fire into the air channel (cavingzone and its filling area is composed of air inlet channel) seepage movement is in accordance withthe theory of porous medium seepage Darcys law. Through the theoretical analysis, laboratory experiment and numerical simulation study of coalseam outcrop fire in under the influence of natural ventilation combustion characteristics of someparameters and rules, of outcrop fire prevention and control of coal seam outcrop fire further studyhas certain guidance meaning.