增氧观测为前提的启封火区实例分析

Example Analysis of Unsealing Fire Zone with the Premise of Increasing Oxygen Observation

封闭火区启封前,对火区所处燃烧状态的准确判断至关重要,这在很大程度上决定着火区启封的成功率和安全性。通过地面钻孔向火区增氧,利用束管监测系统经由地面钻孔直达火区原火源点附近监测气体浓度变化,观测火区内火灾生成气体如CO、C2H4、C2H2等浓度没有上升趋势,据此判断火区火势确实已经处于熄灭状态,确保了火区启封一次成功。

Before unsealing fire zone,it was very critical to judge fire zone burning state accurately,which largely determined the success rate and safety of unsealing fire zone.Though increasing oxygen concentration of fire zone by drilling holes,it used beam tube monitoring system which was from surface boreholes to the original fire point to monitor the change of gas concentration,observe the fire generated gas in fire zone,such as CO,C2H4,C2H2 and so on,they did not have upward trend in concentration,so it was sure that the fire in fire zone was really out indeed,which ensured unsealing fire zone successfully at one time.