| As a key part of mine production system, mine ventilation system has an importantmeaning on whether mines can produce normally and safely. No matter during theoptimization design of mine ventilation or daily management of mine ventilation techniques,it is necessary to reduce the resistance of mine ventilation and improve efficient wind rate, soas to decrease the ventilation cost and improve system stability. At present, domestic andforeign mines have entered into deep resources exploitation condition and used mechanizedmining successively, the deep temperature and equipments’ exothermic increased greatly, theheat injury of mine became more prominent, and mines’ required airflow also increased;Meanwhile, under the situation of the growth of ventilation line, roadway deformation,increase of ventilation resistance as well as the decrease of actual air supply volume, thecapacity of mines’ ventilation system restricts the promotion of mines’ ventilation productioncapacity. Therefore, it is obviously significant and urgent to get down to reduction andoptimization study of ventilation system.Based on the methods of theoretical analysis, numerical simulation, network calculation,site measurement and engineering practice, etc. this paper carried on deep researches onreduction and optimization of ventilation system and the main research contents andachievements are as follows:In this paper, some influencing factors of mine ventilation system, resistance reducingtechniques and methods are deeply analyzed, thus, there obtains related influencing factorsand quantitative analysis formula for two wings diagonal ventilation network and triangleventilation network system; It summarizes main mine ventilation system’s resistance reducingtechnologies such as adjusting network structure, increasing parallel roadway, enlargingroadway’s basal area, adjusting fan’s operating point (frequency conversion control) as well asincreasing or decreasing fans etc. It also inquires into system stability features of two diagonalwings exhausting wind network and triangle exhausting wind network and obtainsquantitative analysis formula for stability.It studies ventilation network equivalent conversion proposes the rules of wind pressuresource effect superposition; It derives equivalent converting formula:(Δ—Y) andsystematically analyzed the resistance features of diagonal network. Thus, there obtains somemain conclusions that the total wind resistance of diagonal network increasing with the periodof a decreasing interval and an increasing interval successively; The exist of diagonal branchcan decrease diagonal network’s total wind resistance efficiently; There exists optimum wind resistance in diagonal branches; The total wind resistance can be reduced by changing mine’smain diagonal branch, etc. It also obtains the intelligent test system for wind resistance featureof diagonal network.It comprehensively measures ventilation parameter of the existing ventilation system andthe main diagonal branches operated ventilation system in Zhouyuanshan coal mine, by whichit mastered mine ventilation situation and proved the conclusions that the existence ofdiagonal branch can reduce diagonal network wind resistance efficiently, and etc. Accordingto Zhouyuanshan coal mine ventilation system, four feasible reduction and optimizationschemes are presented in this paper and each scheme is conducted with ventilation parametersnetwork calculation and comprehensive evaluation. Moreover, it proves the feasibility of thisreduction method that changing mine’s main diagonal branch wind resistance can reduce minetotal resistance. There obtains the optimum scheme to guide the practice of mine ventilationsystem. |
