Fig. 1. Ventilation network at Mine D
Fig. 2. SF6 dispersion and monitoring
Fig. 3. Measurements in the 1st day
Fig. 4. Measurements in the 2nd day
Fig. 5. Measurements in the 3rd day
Fig. 6. Airflow direction in the ventilation network
Fig. 7. Estimation of natural ventilation pressure
Fig. 8. Variation of temperature and natural velocity in the upcast and downcast airways
Fig. 9. Relationship between induced velocity and upcast-downcast temperature difference
Fig. 10. Changes in fan operating condition
Fig. 11. VentSim simulation results for the air velocity and gas dispersion
Fig. 12. SF6 concentration distributions at the shaft bottom
Fig. 13. Relationship between turbulent diffusion coefficient and L/D based on Widodo et. al (2007)
Table 1. Main fan specifications
Table 2. Monitoring stations and equipment installation
References
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