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为了研究松散煤体内氧气输运影响因素及规律,以自行建立的高温松散煤体自吸氧实验装置为对象,采用CFD软件建立了实验装置的数值模型,研究了不同热源强度、空隙率条件下松散煤体高温区域的自卷吸供氧过程。结果表明:随热源强度增加,松散煤体内气流所受浮升力增大,气流运移速度加快可为高温区域运送更多氧气;随着距热源端距离的增加,气流速度v会逐渐变小;在热源强度一定情况下煤体内速度大小与空隙率成正相关,空隙率对松散煤体内气体总压分布影响较小;垂直方向的漏风供氧通道(出风流通道)有利于松散煤体高温火区自卷吸供氧的形成及发展。
In order to study the influencing factors and rules of oxygen transport in loose coal, a numerical model of the experimental device was established by using CFD software to study the self-priming oxygen device of high-temperature loose coal self-priming. The effects of different heat source intensity and porosity Spontaneous absorption and oxygenation of loose coal in high temperature region. The results show that with the increase of heat source intensity, the buoyancy force of airflow in loose coal increases, and the velocity of airflow can accelerate the transport of more oxygen in the high temperature region. As the distance from the heat source increases, the airflow velocity v decreases gradually. Under the condition of certain heat source intensity, the velocity in the coal body is positively correlated with the void fraction, and the void fraction has little effect on the total pressure distribution in the loose coal body. The leaking air supply channel (outlet flow channel) in the vertical direction is favorable for the loose coal body high temperature fire zone Formation and Development of Self - Entrusted Oxygen Supply.