Study On Simulation Modeling For Ventilation Sub-system Of Long Wall Face Region In Coal Mines

Methane explosion is one of the most serious hazards in coal mines. Bringing methane under control has become the most significant factor in mine safety of coal production.In an effort to gain the better understanding of methane transfer and accumulation, this thesis conducts a research on the design and construction of an experiment system with many useful functions such as simulating physical characteristics on the working face and simulating climate conditions in the face region through controlling systems of air delivery and methane emission. This system gives researchers a new approach to study the transfer and accumulation characters of methane in a lab.The experiment system is designed in the research according to the similarity theory such as geometry similarity, similarity of physical conditions, similarity of moving conditions and impetus similarity etc. Thus the geometry dimensions of the model are defined and the model's test-bed is constructed. Furthermore, the controlling system of ventilation is designed and the way in which the system controls air delivery in the experiment process is verified. At the same time, the methane emission system in the model is described to fit the regularity of methane emission and the relavent influencing factors in mines. Besides, the experiment model is flexible enough in simulating various layout of ventilation sub-systems in the face regions of defferent mines. Finally, the hardware and software composed by a series of sensors and a data collection system for the detection of methane migration is assembled and tested.