Underground mine fire accident is one of the most serious types of accidents

according to related documents and information.The author have built three-dimensional models of metal mine ventilation system by using the Ventsim ventilation visualization software for the sake of optimizing control of air current during fires and making related emergency plans.The results show that:the CO concentration in the combustion of different materials has showed the same trend:the figures increase firstly and then decrease

before rising to a top

which is followed by a decent to zero

under the same experiment conditions.The maximum of CO concentrations released by the combustion of rubber

diesel and dry firewood are at approximately 13003 ppm

12742ppm

8779 ppm respectively

which illustrate that the data produced by rubber was significantly higher than that of the other materials;as for the heat release

the highest level is at nearly 26500 kw

produced by burning diesel fuel

which is obviously higher than that of rubber and firewood;the results posted a difference between the heat distribution by the distance and the CO variation over time

and the most important reason of the case of roadway which is directly connected with the return airway is air follow reverse caused by thermal expansion and other factors

whose CO concentration was closed to zero finally.