Simulation of Methane Gas Distribution at a Heading Face—Analysis of environmental conditions at a heading face with auxiliary ventilation (3 rd Report)

摘要

A heading face is usually ventilated by a forcingauxiliary ventilation system with an auxiliary fan and duct, becausemore heat, gases and dust produced by blasting or machines areliberated in the heading place rather than in other working places.In particular, because the explosive gases such as the methane gasare likely to cause serious disaster, appropriate countermeasuresare required in such a heading face.Although a number of studies about the gas diffusion byventilation at a heading face have been reported, methodicalstudies are not seen because most of the results are based onassumptions, due to difficulties in measurement of experimentsand in theoretical analysis.From this point of view, a theoretical study on the profile of gasconcentration at a heading face has been performed by using theCFD code 'LASA 96' which is also used overseas based on SIMPLE algorithm.It is shown that the results of simulation coincide with the actualphenomena and can be available to estimate of ventilationincluding gas in a heading face.