| With the depletion of shallow coal resources,most coal mines in our country are now entering the stage of deep well mining,and even individual mines have reached a depth of 1200m,which has brought outstanding deep well thermal damage.The high temperature and thermal environment underground affects the physical and mental health of related operators and mine production safety.Therefore,the research on mine thermal hazard prevention and cooling technology is of great significance to occupational diseases and production safety.In this paper,aiming at the high temperature heat damage problem of Xieqiao Mine 2212(1)working face,the methods of theoretical analysis,on-site investigation and measurement of heat damage,and numerical simulation are adopted to study the mining face.First,analyze and study the theory of high temperature thermal damage prevention,including:mine climate parameters and heat transfer,thermal environment hazards,calculation of main heat sources and heat dissipation in mines,calculation of cooling load,and technical measures for cooling.Then,the overall Xieqiao mine and 2212(1)coal mining face's thermal damage status is investigated and the thermal parameters are measured and analyzed,mainly in accordance with the basic overview and ventilation,parameter investigation and measurement,thermal damage division,cooling system and layout,etc.get on.Use FLUENT software to numerically simulate the current temperature field of 2212(1)working face cooling,mainly in accordance with the selection of numerical simulation software,the establishment of physical models,the introduction of software for simulation,and the comparison and analysis of simulation results and measured data.By studying the current cooling situation,three optimized and improved cooling schemes are proposed.They are:extending the heat insulation air duct and the air curtain,the air cooler front and cooling capacity split,and the small air cooler is evenly arranged on the working surface.Analyze its engineering application,and then use numerical simulation to verify its feasibility.Through the above research,it is concluded that the numerical simulation analysis of the temperature field of the working face shows that the simulated temperature is in good agreement with the measured temperature,the simulation reliability is strong,and the simulation tools and methods are reliable;the temperature characteristics of the working face are obvious,increasing along the wind flow direction,There are eddy currents in local locations,causing local high temperatures;underground high-temperature surrounding rock walls and goaf walls have a significant heating effect on the wind flow;the overall temperature cloud chart shows that the working surface temperature exceeds the coal mine safety regulations,and a new cooling solution is needed.Among the three optimized cooling schemes:Extending the heat insulation of the heat preservation air duct and the air curtain has a greater mitigation effect on heat damage than the original cooling system;the air cooler front and cooling capacity have been verified to meet the cooling requirements of the working face and can be implemented The performance is stronger than the other two schemes;the small air cooler is evenly arranged on the working surface,and this scheme has the greatest cooling force.The latter two schemes can also better deal with the uneven distribution of cooling capacity.Figure[53]table[27]reference[65]... |
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