Study Of Air Flow Field Analysis And Ventilation Optimization In Heading Face Roadway Excavation

Smoke dust generated in the excavation of heading face roadway is one of the hazards in the mining process, whose hazard is much heavier in contrast with the dust in the general working sites and living places. As a result, using numerical tools to research the air flow field and the removal of smoke dust of heading face roadway excavation is of great importance in the protection of workers, both physically and psychologically.Comprehensively using theoretical analysis methods and numerical simulation method, based on research project-Simulation and Optimization of Ventilation System in Deep Mining, geometric modeling software GAMBIT and computational fluid dynamics software FLUENT was employed in this paper, aiming at the problem of smoke dust under heading face roadway excavation in Fan Kou lead-zinc mine, the research below was undertaken:(1) Some hypotheses were made according to the properties of air in the heading face roadway space, and the specific form of main control equations of air flow field were then obtained. Based on the construction of three dimensional models of forced ventilation, exhaust ventilation, mixture ventilation. The distribution of velocity of the ventilation methods were obtained, and the partition of air flow field were revealed, the correctness of choosing mixture ventilation was verified.(2) Firstly, based on data such as mine ventilation system network diagram, according to the need of simulation, the heading face roadway was simplified, and the area of simulation was then determined. Secondly, the geometric model of the heading face roadway was constructed and meshed by GAMBIT. Finally, the files were imported in FLUENT and the parameters set, the numerical models of heading face roadway ventilation optimization were formed.(3) Using orthogonal experiment method, the5factors influencing heading face roadway local ventilation were analyzed, and the ranges of parameters were determined. Thereafter, the importance factors to ventilation effect and were obtained, a relatively better combination of factors was determined.(4) Using the established ventilation optimization models and FLUENT, the research of numerical simulation optimization of heading face roadway excavation was carried out, the average concentration of smoke dust in the calculation area, the distribution of smoke dust along specific direction, the maximum concentration of smoke dust after blasting in the whole roadway space, and the influence of various factors. On this basis, another relatively better ventilation case was determined and compared with the relatively better solution obtained by orthogonal experiment, thus the final optimal case was obtained.