Study On Effect Of Drainage Conditions On Gas Accumulation Characteristic In Upper Corner

The problems of Corner gas accumulation and overrun plagued coal mine productionsafety is a major problem, In the on-site production conditions, Gob emission from the gas,with a face amount of wind, and the flow of goaf gas drainage, etc., work together to positionthe work surface corner to change the gas concentration in the air with some of the factorsaffecting the occurrence of changes. In addition, some mines in the face of high pumpingroadway layout to ease gob gas to the corner gas gauge problem, making the face gasaccumulation factors and issues that affect the degree of complexity of the role. Therefore, thestudy face with the configuration parameters between wind and gas extraction on the cornergas gauge problem solving has important significance, this paper introduces ventilation airmethane corner gas gauge indicator than as a study on research in the field basis, throughmodeling, numerical analysis method to study the characteristics of the mine face gasaccumulation.In this paper, a large head Jingyuan Coal Mine108East Face of a mining area as theresearch object, a systematic analysis of rock caving goaf characteristics gob gas migrationcharacteristics under extraction conditions, using ANSYS Fluent14.5software simulation ofthe gob gas concentration distribution field and migration law. In the case of combining theactual site as possible, without the simulation of a high return air drill drainage troughconditions (changes in the face with a different amount of wind and extraction capacity factor)ventilation air methane ratio (ventilation air methane amount Face gas Emission ratio betweenthe absolute amount) the relationship between the corner gas concentration; Compared withthe previous relationship between the concentration corner gas trough high return airconditions Borehole mining ventilation air methane. Through a comprehensive demonstrationof two models, the critical value obtained on the gauge corner gas concentrationscorresponding ratio of ventilation air methane, the outcome of mine gas disaster managementhas an important role in guiding.