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Numerical Study of Various Parameters on Blasting Gases and Dust Ventilation in Mines

Pazani, Amir Mohammad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52909 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, Bijan
  7. Abstract:
  8. One of the methods of drilling coal mines is mine blasting (drilling with explosives). In this method, explosives such as dynamite are used to excavate the mine and destroy the coal seams. During this type of drilling, in addition to dust, dangerous toxic gases are also produced, so quick and proper ventilation of mine tunnels is necessary in this type of drilling.Depending on the type of mining, the required ventilation system may be different. For example, if the drilling method is long-term method, the mine ventilation is of the U type, but if the mine drilling is the sub-level caving type, auxiliary ventilation is used.In this study, the method of mining is sub-level caving, so that one main tunnel is excavation on each floor and in each main tunnel, several sub-tunnels excavation by explosives, then by destroying the roof of sub-tunnels using explosives. They extract coal. In this method, by excavating holes in the heading face, they loading explosives in order to destroy the coal seams and advance the tunnel, and before leaving for safety, they leave the tunnel and do not enter the tunnel until the exhaust and standard gas emissions reach the tunnel. The time required for miners to re-enter is usually about 30 minutes experimentally.The re-entry time of miners is very important because if the re-entry time of the miners is not enough, not reduced toxic gases and does not reach the standard level, this will endanger the health of the miners and if the re-entry time is considered too high, It reduces the efficiency of the mine, so it is important to determine the appropriate time for re-entry of miners and reduce this time by observing the standard. The underground tunnels of the coal mine are covered Be Parameters such as channel shape, air duct arrangement, airflow intensity will be studied in this study, and at the end, for each of the studied parameters, a correlation between its and the re-entry time of miners is presented
  9. Keywords:
  10. Numerical Study ; Coal Mine Ventilation ; Ventilation ; Blasting Gases Ventilation ; Coal Mine

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