1 / 26

DPM Dispersion Study Using CFD for Underground Metal/Nonmetal Mines

12 th Mine Ventilation Symposium Reno, Nevada USA. DPM Dispersion Study Using CFD for Underground Metal/Nonmetal Mines. Yi Zheng yzz59@mst.edu Jerry C. Tien tien@mst.edu Mining & Nuclear Engineering Department Missouri University of Science & Technology. OUTLINE.

lise
Download Presentation

DPM Dispersion Study Using CFD for Underground Metal/Nonmetal Mines

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 12th Mine Ventilation Symposium Reno, Nevada USA DPM Dispersion Study Using CFD for Underground Metal/Nonmetal Mines Yi Zheng yzz59@mst.edu Jerry C. Tien tien@mst.edu Mining & Nuclear Engineering Department Missouri University of Science & Technology

  2. OUTLINE • DPM Regulation for U/G M/NM Mines • DPM Situation and Control Strategies • Simulation Method and Assumption • Main Airflow Simulation • Single Heading Airflow-Blowing & Exhausting • Results and Discussion • Summary and Conclusions

  3. DPM Regulation for U/G M/NM Mines • Diesel-powered equipments are widely used in U.S. U/G M/NM mines for the power, reliability, easy to operate and repair, fuel efficiency, durability, etc. • However, it can cause health problems. • Therefore, beginning May 20, 2008, 160 μg/m3 of TC or less is required by MSHA.

  4. DPM Situation • 2001 - 2002, MSHA 358 valid samples from 30 mines: 488 µg/m3 of TC for metal mines, 372 µg/m3 of TC for stone mines… • 2002 - 2003, MSHA 1,194 valid DPM from 183 mines: 354 µg/m3 of TC for metal mines, 235 µg/m3 for stone mines… • 2003 – 2006, MSHA 1,798 valid samples from all mines covered by the regulation: 64% (1,151) exceeded 160 µg/m3 of TC…

  5. DPM Control Strategies • MSHA six available DPM control strategies: Modern low-DPM emission diesel engines; upgrade ventilation system; environmental cabs; work practices; alternative fuels; DPM filters. • Ventilation is a critical one: 1 gram of DPM can pollute 6,250 m3 of space to final limit if without ventilation.

  6. Simulation Method and Assumption • Simulation Method: Computational Fluid Dynamics • Program: FLUENT • Assumption: DPM movement will be entirely dictated by the airflow patterns

  7. Main Airflow Simulation South section of an underground metal mine

  8. Main Airflow Simulation—without Stoppings Path of small particles without stoppings

  9. Main Airflow Simulation—with Stoppings Stoppings to guide the air

  10. Main Airflow Simulation—with Stoppings Path of small particles with stoppings

  11. Main Airflow Simulation—with Stoppings Three types of working face with ventilation problems

  12. Main Airflow Simulation—with Stoppings Main airflow velocity near the dead end opening

  13. Single Heading Airflow Simulation Single heading Main entry Layout of a single heading with blower fan and tubing

  14. Single Heading Airflow Simulation Layout of a single heading with exhaust fan and tubing

  15. Single Heading Airflow Simulation CAT 725 articulated truck CAT 980H wheel loader

  16. Results and Discussion—Blowing System Airflow velocity of the main entry and single heading

  17. Results and Discussion—Blowing System Airflow velocity in the face area

  18. Results and Discussion—Blowing System Exhaust airflow pattern in the face area

  19. Results and Discussion—Blowing System DPM concentration dispersion in the face

  20. Results and Discussion—Exhausting System Airflow velocity of the main entry and single heading

  21. Results and Discussion—Exhausting System Airflow velocity in the face area

  22. Results and Discussion—Exhausting System Exhaust airflow pattern in the face area

  23. Results and Discussion—Exhausting System DPM concentration dispersion in the face

  24. Summary and Conclusions 1. CFD method can be used to simulate the airflow patterns for the entire mine or for a part of it. Areas with poor ventilation can be identified and local ventilation control measures designed and evaluated. 2. Single heading face usually has the worst working condition in underground mines. Local ventilation facility is needed to improve the situation. 3. In a single heading face, loader driver is working in a higher DPM environment for both blowing and exhausting systems. More work need to be done to meet the regulation.

  25. Summary and Conclusions 4. DPM is distributed in a much smaller space in a blowing face ventilation system than in an exhausting face system, which means high air velocity is more effective than quantity to control DPM. 5. In the near future, a validation experiment is planed to take out. After that, a single measurement in the face (near the exhaust pipe) can give the DPM concentration distribution for the whole face area.

  26. Thank You!

More Related