再生火源现象的煤炭地下气化模型实验研究

Study of Secondary Fire Source by UCG Model

煤矿外因火灾发生与煤炭地下气化点火过程具有很大的相似性,两者皆会发生再生火源现象。实践证明,再生火源是煤炭地下气化的正常点火和煤矿火灾控制的一个重要影响因素。通过对煤炭地下气化点火过程进行模型试验台研究,通过对其温度场、浓度场进行监测,全面探索了再生火源的发生规律,发现再生火源是由烟气拥塞和烟气加热共同作用产生。在此基础上,提出了预防煤矿外因火灾及煤炭地下气化点火过程中再生火源产生的一些可行性措施。

The exterior underground - coal - fire （UCF） is largely similar to the ignition of the underground coal gasification （UCG）. Exterior fire source would take place in both process and becomes an important factor for the control of them. The article studies the temperature field and the concentration change of the gas during the ignition process of UCG through a system of UCG modeling. Then it answers how and why the exterior fire happened. It turned out to be the outcome of the smoke choking and heating together. In the end, it gives some productive advice to the prevention of the exterior fire during coal mining and a successful ignition to UCG.