Simulation of spontaneous heating in longwall gob areas with a bleederless ventilation system.
2008 SME Annual Meeting and Exhibit, February 24-27, Salt Lake City, Utah, Preprint 08-043. Littleton, CO: Society for Mining, Metallurgy, and Exploration, Inc., 2008 Feb; :1-6
Although it is only utilized in a few U.S. longwall mines, a bleederless ventilation system can be an effective spontaneous combustion control method in mines with a demonstrated history of spontaneous combustion. In order to provide insights for the optimization of bleederless ventilation systems for U. S. underground coal mines, a computational fluid dynamics (CFD) study was conducted to model the spontaneous heating in longwall gob areas with a bleederless ventilation system. A single longwall panel with a bleederless ventilation system was simulated, and typical ventilation data for a longwall mine was used in the simulations. The permeability and porosity profiles for the longwall gob were estimated using a geotechnical model and were used as inputs for the CFD modeling. The effects of gob permeability and resistance of the collapsed entries on the spontaneous heating were studied. The effectiveness of nitrogen injection to prevent spontaneous heating in the gob was also examined.
Mining-industry; Underground-mining; Ventilation; Ventilation-systems; Longwall-mining; Coal-mining; Models; Computer-models; Explosion-prevention; Fire-prevention; Spontaneous-combustion
2008 SME Annual Meeting and Exhibit, February 24-27, Salt Lake City, Utah, Preprint 08-043