Experiments on a Mine System Subjected to Ascensional Airflow Fire and Countermeasures for Mine Fire Control
Abstract
1. Introduction
2. Theoretical Model of the Airflow Disaster Process in Underground Mine Fires
3. Experiment on Airflow System Disorder of Mine Fire
4. Experimental Results and Analysis
4.1. Airflow Disorder Characteristics in Ventilation System during Ascensional Airflow Fire
4.2. Variation Characteristics of Fire Heating Air Pressure and Ventilation Thermal Resistance
5. Simulation Analysis of the Disaster Evolution during the Period of Ascensional Airflow Fire in a Mine
5.1. Analysis of the Disaster Evolution during the Period of Ascensional Airflow Fire in a Mine
5.2. Analysis of Wind Flow Disorder Change Process in the Side Branch (Belt Uphill)
5.3. Emergency Planning Measures to Deal with the Reversal of Smoke Flow during Mine Fires
6. Conclusions
- (1)
- The experiments conducted in this study showed that, under the thermodynamic effect of fire and ascensional airflow fire period, the main wind duct air volume increased, the side branch air volume decreased, the airflow stagnated, and a reverse flow phenomenon occurred. When the fire development was strong, the fire heating air pressure caused the circulation of the airflow in the ventilation circuit, while the pipeline ventilation thermal resistance increased. Improving the air supply capacity of the ventilator could help overcome the retrograde of the wind flow of the fire side branch of the ascensional airflow and mitigate the disaster. The simulation results were in good agreement with previous experimental results, which were completely consistent with the airflow change law.
- (2)
- Increasing the ventilation fan speed was beneficial to divert the smoke from the mine fire. Using the TF1M3D platform simulation, the calculation mine ventilation fan was set at a speed of 540 r/min. After the occurrence of an ascensional airflow fire for 430 s, the airflow reversed in the side branch, and smoke flow circulation threatened the 401 intake roadway. After 4950 s, the fire strength was reduced, and the smoke flow caused a secondary attack at the side branch 402 working face. After increasing the fan speed to 740 r/min, the fire smoke diversion and disaster control were more favorable.
- (3)
- The TF1M3D software was found to be suitable for complex mine ventilation systems and can help simulate fires under real conditions in specific mines, providing auxiliary decision support for gaining disaster experience and developing fire emergency management plans. In future work, we will deeply study the ventilation law during the period of a mine disaster.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Platform Element | Material | Size (Inner Diameters × Length)/mm |
---|---|---|
Total air inlet duct | Stainless steel | 50 × 700 |
Main air duct | Quartz | 50 × 4800 |
Side branch air duct | Stainless steel | 50 × 4800 |
Total air outlet duct | Quartz | 50 × 400 |
Order | Time/s | Location Node | Order | Time/s | Location Node |
---|---|---|---|---|---|
1 | 45 | 7 | 9 | 2055 | 8 |
2 | 195 | 17 | 10 | 2070 | 5 |
3 | 300 | 81 | 11 | 2910 | 6 |
4 | 330 | 11 | 12 | 4575 | 6 |
5 | 480 | 21 | 13 | 5055 | 37 |
6 | 550 | 20 (Return air shaft entrance) | 14 | 5115 | 8 |
7 | 1635 | 37 | 15 | 5385 | 26 |
8 | 1920 | 4 |
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Zhang, M.; Li, Z. Experiments on a Mine System Subjected to Ascensional Airflow Fire and Countermeasures for Mine Fire Control. Fire 2024, 7, 223. https://doi.org/10.3390/fire7070223
Zhang M, Li Z. Experiments on a Mine System Subjected to Ascensional Airflow Fire and Countermeasures for Mine Fire Control. Fire. 2024; 7(7):223. https://doi.org/10.3390/fire7070223
Chicago/Turabian StyleZhang, Mingqian, and Zongxiang Li. 2024. "Experiments on a Mine System Subjected to Ascensional Airflow Fire and Countermeasures for Mine Fire Control" Fire 7, no. 7: 223. https://doi.org/10.3390/fire7070223
APA StyleZhang, M., & Li, Z. (2024). Experiments on a Mine System Subjected to Ascensional Airflow Fire and Countermeasures for Mine Fire Control. Fire, 7(7), 223. https://doi.org/10.3390/fire7070223