South Wenhe Tungsten Mine Area Is Controlled By Circulating Ventilation And Monitoring System Optimization Research

As polluted water can be reused, research on recycling of polluted air in underground mining is of great significance. Ways of leveling down ventilation energy consumption will bring great economic effect, especially for mines that demand increasing energy consumption on ventilation. With increasing progress on technology research on controlled recirculating ventilation, monitoring control system has been getting improved and got utilized. For those metal and nonmetal underground mines, because the mine gas is near zero, controlled recirculating ventilation can be widely applied, advantages of this system can be get into full play if dust under shaft can be effectively purified.In the paper, based on the project of optimization study on complex underground ventilation sysytem of Nanwenhe river tungsten mining in Malipo, Wenshan Prefecture, Yunnan Province, in order to carry out some theoretical research on area controlled recirculating ventilation before application, to analyze its safety, controllability and economic implications, according to particularity of object of study, the the author mainly carries out researches on controllability and availability on recirculating air, reasonable choice of recirculating area, reasonable lauout of circulating ways, application of high pressure spray and dust reduction system, effective drop of temperature in circulating area, reasonable match on circulation parameter, achievement of monitoring control system in circulating area,and energy saving effect of circulating ventilation. On the basis of full use the experience of existing research results, the thesis mainly deals with the following intensive study.1、To analyze those existing and upcoming ventilation problems in the process of underground mining in our country, to comment stage research results from theoretical research, experiment research, experimental investigations and field practice carried out by scholars at home and abroad. The research conclusion is that controlled recirculating ventilation, which can be widely used in transformation research of difficult ventilation areas in metal and nonmetal underground mines, is a kind of Ventilation transformation technology with high safety, easy to realize and with obvious economic effect.2、Compared with change of downcast air of controlled circulating ventilation system, upcast air of working face and dust density in return air in regular ventilation research, getting the following conclusion that:if ventilation flow is stable, dust density in circulating area is related to volume of fresh air, dust amount of working face, dust density in fresh air, efficiency of dust fall and circulation coefficient. Optimization on coefficient plays a great role in giving full play to Optimization Reforming of controlled circulating ventilation. Meanwhile, technical study to dealing dust in circulating area through high press spraying to fall dust is provided. Eficiency of dust reduction curve is drawn through MATLAB software, that is, when spray head is laid against the wind45degree down, diameter of spray head is1.0mm, hydraulic pressure of spraying water is7.5MPa, distance of spray head0.5m, particle size is5μm, dust reduction rate can reach90%, which can meet the dust reduction requirements of circulation system. Effective application of this technology is also favorable for improvement thermal environment of working face underground.3、Adopting reasonable monitoring and control means in area controlled circulation ventilation system will be advantageous to operation of ventilation safely and effectively. Relying on the establishment idea of safety hedging six systems for Nanwenhe river tungsten underground mining, research on target of monitoring and controlling in area controlled circulation ventilation system to to provide guidance for its realization.4、After analyzing problems like weak ventilation, low efficiency of effective air volume, disordered layout of local fan, operation affection of trackless equipment, part high temperature in1232m midpiece in south side in Mining plant of Nanwenhe river tungsten mining, the idea of using controlled circulating ventilation to optimize and transform is given.Based on reasonablely selecting parametersof controlled circulating ventilation area, circulating air duct, rate of circulation, air volume of circulation, purifying efficiency, it is find that,in the situation that effective dowmcast air keep stable, controlled circulating ventilation can make the air volume at working face increase to84.66m3/s,which is slightly larger than the air volume of74.56m3/s needed in regular ventilation, it means that air volume of controlled circulating ventilation can meet the demand of mine production. Even that it is possible to expanse capacity of circulating area.5、After calculation of total resistance in circulation area, circulation fan air quantity, circulation fan air pressure, circulation fan shaft power, a K40-6-No.15fan should be used into circulating ventilation for Nanwenhe river tungsten mining ventilation area. In traditional ventilation system, when air quantity at site is increased to84.665m3/s from49.45m3/s, powder consumed is increased5.021times, comparatively, when controlled circulating ventilation is adopted, powder consumed is increased just1.845times. In terms of a mining area of capacity of300,000tons per year, cut down of powder consumption has good economic benefit for ventilation system for the whole mining.