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High-intensity gas-coal caving face comprehensive technical measures


Adams absolute emission of 12m/min (relative emission 3m. / T), describes ventilation is not suitable for U-mining technology and mining of existing strength requirements. 3 short-term impact of increased gas density and other factors affect the short caving face higher gas concentration factors: ① In general, the first time to face pressure and cycle pressure,air jordan high heels, due to take the roof off a large area, the mined-out area gas short crowded face; ② caving with more than three time, gas concentration increased significantly, so in strict accordance with operating procedures to operate; ③ face piece to help, roof fall short when the gas concentration can lead to increased face; ④ cutting coal speed suddenly increases, the gas concentration will lead to increased coal mining in the vicinity or even overrun, so to operate in strict accordance with operating procedures. 4 comprehensive technical measures 4.1 change the U-ventilation as a program, set the location shown in Figure 3. Ventilation into the face Gas Lane section of 2.8 × 3.2m, bolting with mesh. Gas Lane for the air volume of not less than 200m. / Rain, Gas Lane gas concentration at 2.5 or less. By measuring (measuring local fan off the water), the work surface wind range that the accumulation of gas Lane No. 3 Wang Yongshen: high-intensity gas-coal caving face comprehensive technical measures in September 2007 was smaller, changed from the original 3O ~ 4Om 8m or less, and gas concentration decreased 3.5, indicating the role of gas Lane is obvious. Figure 3 Water Board pumping fan rehearsal amp upper corner on the corner gas 4.2 additional pumping equipment has been research that a strong, pumping high concentrations of gas to the device, there are two, one is the Coal Research Institute Tangshan Institute developed At first mine to use hydraulic ejector pumping on the corner gas,radii shoes sale, because of its low air volume and pressure, on the corner gas concentrations have overrun the time. Later changed to Bureau of fans pumping water on the corner gas, water bureau fan because of the amount of air pressure are large, pumping good effect, on the corner gas when no overrun. 4.2. I Water Bureau fan works, the water structure using local fan drive turbine principle, that the water pressure through the nozzle, along the tangent direction of the Pelton turbine fired on, the water wheel rotates and the other end of the axial drive coaxial impeller rotation, and negative pressure to form a romantic. Water, local fan has a simple structure, is to remove the electric motor fan Council, converted into turbine to drive the local fan, that is, on the same shaft, one end of the installation of the water wheel, the other end with a high efficiency impeller. Spindle, and Pelton water wheel is the use of alloy steel material, impeller and housing non-firing aluminum alloy. Water Bureau fan main technical parameters: wind 200 ~ 500m. / Rain, the whole pressure 3O0 ~ l200Pa, weight l2O. 4.2.3 Water Bureau fan installation and use of water can take local fan duct pressure, negative pressure can also be connected hairdryer, according to the actual situation on-site connection. Water Bureau fan installed in the mine caving face shown in Figure 3. Water Bureau fan suction outlet on the corner gas placed in the highest concentration of sites, the outlet set in the range of advance support required before the outlet air flow around the smooth, non-electrical equipment,mulberry bags uk, exports around 1.5m range settings alert. Water Board process by using the measured fan, hairdryer Neiwa Si concentration of 2 to 5. Water Bureau fan by aluminum, light weight, with the face forward, easy to move. 5 Conclusion At present, the mine ventilation caving face a limited time, a good solution to the high-intensity work surface caving corner gas accumulation problem. ① face References [1] Sunkeren. SBF5o Type 1 hydraulic drive fan out at high gas water machine, the application of early mining face, hydraulic mining and pipeline transportation. 1995 (1) [2] package ying and so on. Yangquan coal mine gas control technologies, Coal Industry Press, 1996 Author: Wang Yongshen (1964 A), male, graduated in 1987 the new School of Mines mining professional excellence,ed hardy canada, has published papers 2O articles. Received Date t2007-05-08 welcome welcome submission advertising, donkey,tory burch outlet, donkey, donkey, donkey, donkey, donkey, donkey donkey, donkey, donkey, donkey, donkey, donkey, donkey, donkey, donkey, donkey, donkeys, donkey, donkey, donkey, donkey, aunt 33. Donkey donkey
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