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当区段采用返回煤柱的往复式通风系统时,巷道网内风流的合理分布往往发生困难。同时,为了形成一定的通风储备,把富裕的风量送入区段,因而回采工作面回风流中沼气的含量通常为0.4～0.9％。 区段中过高的风量,伴随着坑道内负压的增加,这样,由于采空区漏风量的增大,导致瓦斯涌出量和煤的自燃危险性的升高。当区段内具有圈定通风下山保护煤柱的边界通风联络巷时,这些缺点可以得到部分的消除,如图1所示。
When the section uses the reciprocating ventilation system that returns the coal pillar, the reasonable distribution of the airflow in the tunnel network often has difficulties. At the same time, in order to form a certain reserve of ventilation, the wealthy air volume is sent to the section, so the biogas content in the return air flow at the mining face is usually 0.4 to 0.9%. In the section, the excessively high air volume is accompanied by the increase of the negative pressure in the tunnel. In this way, due to the increase of air leakage in the goaf, gas emission and the risk of spontaneous combustion of coal increase. These shortcomings can be partly eliminated when there is a boundary ventilation tunnel in the section that is delineated by a well-ventilated down-hill pillars, as shown in Figure 1.