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Study On Slurry Diffusion Behavior Of Grouting Fire Prevention In Spontaneous Combustion Goaf Of Jungar Coalfield

Posted on:2013-09-17Degree:MasterType:Thesis
Country:ChinaCandidate:J H ZhangFull Text:PDF
GTID:2231330371490462Subject:Safety Technology and Engineering
Abstract/Summary:PDF Full Text Request
Coal is important foundation energy and important raw materials, and it is non-renewable resources. Spontaneous combustion of coal is a serious threat to mine safety in production, and cause a lot of waste of resources. With the integration of coal resources, a large number of small coal mines due to unauthorized mining goaf seam spontaneous combustion are particularly prominent. Grouting Fire Prevention technology is the most commonly used as a mine fire prevention technology, one of the governance spontaneous combustion in goaf is currently the most practical and most effective way. On the basis of determining the location of the fire source, grouting anti-fire measures taken on the spontaneous combustion in goaf, which grasp the dynamic diffusion behavior of the slurry is whether the key to extinguish the fire source. Due to spontaneous combustion the gob belonged to the discontinuous media, serous non-Newtonian fluid, the theory in this regard, less experimental and simulation studies. Depth study of diffusion behavior of slurry in spontaneous combustion in goaf, can further improve the accuracy of the parameter settings in the grouting Fire Prevention technology has important scientific significance and application value.The paper based on influencing factors of small pit goaf in Jungar Coalfield and slurry flow pattern, analyzes the characteristics of the Jungar small gob of Spontaneous Combustion in the derivation of the flow pattern of infiltration grouting diffusion formula, with self-developed spontaneous combustion in goaf grouting bench, through experimental research, theoretical analysis, numerical simulation and engineering practice, carried out a systematic study on the the Jungar small kiln spontaneous combustion in goaf grout dynamic diffusion behavior.The main research contents and results are as follows:(1) Jungar small gob of Spontaneous Combustion characteristics. For the Jungar small kiln coal seam geological features, discussed in detail the factors and characteristics of the impact of the Jungar smkall gob area of spontaneous combustion.(2) Penetration of the grout to the proliferation of the derivation of the formula. Consider the structure of the slurry viscosity changes, on the one hand, the permeability coefficient of the angle of change over time, on stick Fluid percolation theory formula to improve; the other hand, the path changes the angle of departure from the permeability coefficient with the application of the linear source function theory Bingham fluid percolation theory formula for improvement.(3) the Jungar small kiln spontaneous combustion in goaf grouting Test Platform. Developed on the basis of analysis of the Jungar kiln spontaneous combustion in goaf characteristics the Jungar kiln spontaneous combustion in goaf grouting bench. The experimental device simulation small kiln spontaneous combustion in goaf geological features, and to study the spontaneous combustion in goaf medium single-tube single-hole, single-tube porous, multi-tube single-hole, multi-tube grout in porous orthogonal diffusion behavior.(4) The Jungar kiln spontaneous combustion in goaf grout diffusion behavior of numerical simulation. Application of UDEC to simulate the injection process in the Bingham type of slurry in the rules discontinuous jointed rock masses by keeping drilling within the specified pressure.(5) The Jungar small kiln spontaneous combustion in goaf grouting anti-extinguishing slurry diffusion behavior of field-proven. The application of grouting Fire Prevention technology governance Shenhua Zhunneng the spontaneous combustion of small coal mines in the fire zone, according to the theory, experiment and numerical simulation results, set the drilling and grouting parameters, adjacent to the amount of drilling grouting to verify the theoretical, experimental and the slurry obtained by the numerical simulation of diffusion behavior.
Keywords/Search Tags:Jungar coalfield, spontaneous-combustion of small pit Goaf, bingham liquid, diffusion behavior, grouting test, discrete element method
PDF Full Text Request
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