In order to solve the problem of subjective analysis and single index in the fire risk assessment of mine belt,we proposed a comprehensive evaluation method of mine belt fire risk based on entropy weight method and grey correlation degree method.We analyzed the key influencing factors of fire risk such as light transmittance,heat release rate,smoke generation rate and CO generation rate of mine belt fire smoke using NBS smoke density test box and cone calorimeter,established a multi-level evaluation index system of mine belt fire risk;and evaluated the fire risk of mine belt under different thermal radiation conditions.The results showed that,under the thermal radiation intensity of 50 kW/m2,the light transmittance in the test chamber decreases rapidly,and decreases to 0 at 70 s.Compared with the heat radiation intensity of 25 kW/m2,the peak heat release rate and total heat release at 35 kW/m2 was 29.06%and 36.22%higher,respectively.the peak smoke production rate and total smoke production was 45.55%and 31.54%higher,respectively;and the time to reach the peak smoke production rate was 92.59%less.The weight ranking of fire risk factors of mine belt is:combustion risk(0.5216)>smoke risk(0.2522)>toxic gas risk(0.2261).
NETL
NSTL
万方数据
