Research On Ventilation System Simulation And Its Applications In Jinchuan Mine

A tackless transport system is used for mining of the No 2 ore zone in Jinchuan mine. The main ventilation system is a stages fans connection in series and parallel connection with tiny positive press. .the tail gas discharged from trackless machine have not only polluted the environment of stop and transporting section ,but also affected the healthy of working men ,the phenomena is much serious when the collapse of main air shaft in the 14th section in 2005 years ,the ventilation as well as the order of safety production of mine district are damaged, the working environment are deteriorative ,as results ,the working efficiency and production capacity are decreased . There is not fresh air available in the level of 1150 and 1000m, there is not air available near the central jack shaft , the high temperature makes the environment of NO 2 mine district deteriorative ,the air circulating and inversing is serious , there is air inversion phenomenon all round the year in the main inclined roadway ,the resistance of return system in panel district increased ,effective air returning decreased obviously ,ventilation network is so complex that the management of them are difficult .Based on the technical problems existing in the ventilation system of Jinchuan mine district ,the research on mine ventilation simulation theory are carried out , the mine ventilation simulation system has been used in the NO 2 mine district ,which makes good economical and environmental benefit ,solve such problems existing in the ventilation systems as air insufficient , air inversion , air circulating as well as the serious pollution in working environment . The main originality innovation and rated conclusions are as follows.Main conclusions of this paper are as follows:1. If the location of fan station or the selection of fan power are not reasonable , the side wind path of fan station can be caused the phenomenon of air inversion ,if there is other ventilation power in the side wind path or the ventilation power outside of circulation body are insufficient ,then , the air flow of side wind path should be caused to be inverse to form the one-way return passage ,which lead to the failure of all path algorithm .as results, in order to control the occurrence of one-way return passage or decrease the influence degree of one-way path on the ventilation system , the location of multi–stage fan station should be optimized to discard the side are path or circulation wind ,increase the ventilation power in the side wind path or outside of circulation body to avoid the generation of circulation air due to the inversion of side wind path ,after the removal of side air path or circulation air , all the path algorithm are effective.2. Diracted graph can not define all the diagonal structure systematicly, completely and accurately; diagonal structure only depends on the topological relations of corresponding graph of ventilation network, which are independent of various of parameters .The change of air resistance of diagonal branches can not only lead to the change of input air of branch as well as other branch of network, but also the change of flow direction of other branch. The diagonal air path has the characteristic of instability, but, if the change of diagonal branch flow direction has no negative effect, the existing of diagonal air path in ventilation network can increase the integral stability and reliability of network and decrease the toal wind resistance of network.3. The ventilation system graph and ventilation network graph can only reflect the topological relations of ventilation system not the quantitative relations .but ,the ventilation network characteristic graph of Jinchuan mine district can not only reflect the node relation ,return circuit relation ,cut-set relation, closed-circuit relation of ventilation network graph ,but also can reflect the air amount, resistance ,power consumption ,in addition , it can not only reflect the technical management level of ventilation system ,but also the fire-extinguishing technical means .Comparison with the ventilation network graph , the characteristic graph are more vivid and illustrative , besides ,it can be quantitative especially in facets of the closed-circuit and cut-set.4. Based on the research on the mine air curtain blocking ,injection and increasing or decreasing wind resistance model as well as the stimulation certification of their conclusions and application test on the site , mine air curtain has the merits of injecting air to substitute fan station ,blocking air to substitute air door and increasing or decreasing wind resistance of tunnel to substitute wind window5. Such factors as the outlet section multi–single parallel air curtain fan ,the blade angle of fan, the angle between the axis of air curtain injection and the axis of tunnel have influence on the capability of the blocking and injection of air curtain .as for the air curtain blocking the air flow, the greater the S c,the better the capacity that the air curtain resists the interference from air flow and energy saving ,but , because the confinement from such factors as field condition, capacity of fans and permitted air speed , S c must be in a limit range . As to injecting air curtain, the decreasing of discharge area of injector would increase the energy of discharging air so as to increase the injection air of tunnel. But, at the same time, the working resistance of air curtain are increased, the air of fans are decreased, when the influence of latter are greater than the former, the injection air would be decreased. The main originality innovations in this paper are in following:1. Based on field survey , parameters test , combined with ventilation network theory , set theory ,graph theory as well as computer technique ,shaft ventilation analogue simulation system of JinChuan mine district is developed ,which realize the interactive operation of shaft ventilation information processing and graph as well as analogue simulation technique .2. Shaft ventilation analogue simulation technique and multi and single machine mine air screen model is adopted to establish air screen wind injection to substitute fan station, air screen wind blocking to substitute air door, air screen increasing or decreasing wind resistance of tunnel to substitute wind window,which resolve the such technical problems of large scale flexible transporting tunnel as the placement of fans3. Such technique as the mine air screen can form air curtain to block air can explain the reasons for the phenomenon that the return results are not good although two parallel fans are installed in the main return air tunnel .The main reasons lie in that double air curtain are formed to increase the wind resistance and block the return of air, at the same time, the technical scheme as tandem fans replacement of parallel fans are presented.