The "Three Zones" Microcirculation Theory of Goaf Spontaneous Combustion and a Numerical Simulation of the Air Leakage Flow Field
YANG Sheng-qiang
XU Quan
HUANG Jin
CHU Ting-xiang
Abstract：The 2307 working face of the Tangkou mine was studied by taking temperatures and gas samples at the goal and considering the "Three Zones" spontaneous combustion model. FLUENT was used to simulate the air leakage flow field at the goaf. The results show that spontaneous combustion appears to involve both micro-circulation of oxygen and thermal processes. Spontaneous combustion will occur when oxygen input from ventilation leakage is greater than oxygen consumption by the oxidative process and the ventilation leaks dissipate less heat that produced by coal oxidation. The zone of spontaneous combustion of "Three Zones" with different air volume is obtained. On the intake side of the goal spontaneous com-bustion was possible over the range from 48.2 m to 98.6 m. At the return side the range was 24.3 m to 98.6 m. The best air supply volume for goal fire prevention and extinguishment was found to be between 1 200 m~3/min and 1 440 m~3/min.
Keywords：goalspontaneous combustion of "Three Zones"microcirculation of oxygen and thermaloptimum air supply amount
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 769-773,788 )