Numerical Research of Oxidation Zone Variation in Goaf of Longwalls U-Type System from Borders and U-Type System to the Borders Ventilated

World Multidisciplinary Earth Sciences Symposium

Tutak, Magdalena^1

Silesian University of Technology, Akademicka 2, Gliwice

44-100, Poland^1

关键词: Chemical constitution;    Geological conditions;    Numerical research;    Oxygen concentrations;    Spontaneous combustion of coals;    Tests and analysis;    Underground mining;    Ventilation systems;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/221/1/012090/pdf
DOI  :  10.1088/1755-1315/221/1/012090

来源: IOP

【 摘 要 】

Endogenous fires are significant hazard in the Polish and global underground mining industry. These fires are result of spontaneous combustion of coal due to the inability to discharge heat from the oxidation process. One of the main places of occurrence of endogenous fires are goaves in longwalls. By endogenous fire we mean self-ignition of coal, caused by a process of self-heating of coal (leading to increase in temperature), and under endogenous fire hazard possibility of coal self-ignition as a result of its self-heating process in mining heading or its surroundings. Hazard of endogenous fires in these goaves are formed due to the airflow with determined velocity and specified chemical constitution. The velocity of air stream mainly depends on the type of rocks forming the stroke and applied longwall ventilation system. In the paper results of numerical research of airflow through goaves ventilated in U-type system from borders and U-type system to the borders are presented. The aim of the analysis was to determine in these goaves a oxidation zone. For determined mining-geological conditions, the critical value of velocity of airflow and oxygen concentration in goaves, conditioning initiation of coal oxidation process were determined. Modelling studies carried out basing on the developed methodology included in its scope the study of spatial models of exploitation longwalls being ventilated on the U-type system from the borders and U-type system to the borders and its goaves. Results of tests and analyses, as well as conclusions presented in this article should be a valuable source of knowledge, and could be used in the practice of choosing exploitation longwall ventilation system and ventilation parameters of the air.