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Simulation and Safety Improvement of Ventilation System for Longwall Coal Mine

Ehtiati, Navid | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52219 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, Bijan
  7. Abstract:
  8. Coal has always been an unneglectable share of countries’ energy basket as the oldest known fuel. Concerning Iran’s rich coal mines, it plays a particular role in the country’s development programs. Mine Ventilation is one of the most vital issues in mining activities. While excavation activities might experience an overhaul phase, Ventilation must be operating nonstop. Since coal mines are gassy generally, mine ventilation design should include appropriate principles. U ventilation scheme is the most common ventilation scheme being used in longwall coal mines. While spontaneous combustion is less probable in the scheme in comparison by other schemes, methane accumulation in tailgate entries are critical. The current numerical simulation project has used two methane generation source to model emitted methane from gob and coal cutting. By maintaining a constant inlet airflow, two parameters (working face width and tailgate width) were considered to find an optimal combination. This project aims to investigate the effect of the mentioned parameters on the concentration of accumulated methane in tailgate by using CFD. For modeling the geometry, a 10 meter-width gob added to modeled airways. The results showed that a width ratio of 0.85 to 0.95 is the best ratio which helps to decrease methane accumulation
  9. Keywords:
  10. Coal Mine Ventilation ; Longwall Mine ; Coal Gas ; Fluent Software ; Computational Fluid Dynamics (CFD)

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