不同通风方式下回采工作面突出引发风流逆转的危险性探讨

分析评价突出矿井采区通风系统的安全可靠性,对于优化突出矿井的通风系统、提高矿井的防灾、抗灾能力有重要现实意义。为了明确U型通风与Y型通风在突出矿井工作面应用中的优越性,本文分析了在U型通风和偏Y型"一进两回"通风情况下,工作面发生瓦斯突出时进风顺槽发生风流逆转的临界条件。以阳泉保安煤矿突出矿井的回采工作面实际通风条件为例,分析了偏Y型"一进两回"通风方式时,工作面推进对设置调节风窗位置的要求;并分析了两种通风方式下,工作面的推进距离与巷道发生突出引发风流逆转的临界瓦斯突出量关系。研究表明:在U型通风方式下,发生风流逆转临界突出瓦斯量随工作面剩余减短而降低,且降低速度逐渐加快。在Y型通风方式下,发生风流逆转临界突出瓦斯量随工作面剩余减短而呈近似线性降低。在工作面开采初期,偏Y型"一进两回"通风方式抵抗瓦斯突出引发风流逆转的能力远大于U型通风方式,但随着工作面推进,进风顺槽长度变短,这种优势越来越小。

Discussion on the danger of airflow reversal caused by the prominent working face under different ventilation modes

Analyzing and evaluating the safety and reliability of the ventilation system in outburst mining area has important practical significance for optimizing the ventilation system in outburst mine, improving the ability of disaster prevention and resistance in mine. In order to clear and definite the superiority of U-type ventilation and Y-type ventilation in the application of outburst working face, the critical condition of air flow reversal in the inlet duct when gas outburst occurs in the working face under U-type ventilation and Y-type one-in-two-back ventilation is analyzed in this article. Taking the actual ventilation conditions of the working face in Yangquan Baoan Coal Mine as an example, the requirements of setting and adjusting the position of the air window for the working face advancing under the Y-type one-in-two-back ventilation mode are analyzed. And analyzing the relationship between the advancing distance of the working face and the critical gas outburst caused by roadway outburst and airflow reversal under two ventilation modes. The research results show that the critical gas outburst volume of air flow reversal decreases with the decrease of the working face surplus, and the decrease rate is gradually accelerated in the U-type ventilation mode. Under the Y-mode, the critical outburst volume of air flow reversal decreases linearly with the decrease of the remaining gas in the working face. At the initial period of working face mining, the ability of Y-type one-in-two-back ventilation to resist the airflow reversal caused by gas outburst is much greater than that of U-type ventilation. But with the advance of the working face and the length of the inlet chute becomes shorter, the advantage will become smaller and smaller.