Study on Thermal Degradation Kinetics and Fire Hazard of Mine Cable Sheaths
In order to understand the combustion performance of the mine cable sheath and provide the basis for the safe design and reasonable selection of the cable,the thermal degradation characteristics and fire hazard of MYQ,MHYV and MKVV-type cable sheaths are studied by TGA/DSC and CONE experiment respectively.The results show that the thermal degradation process of the three types of sheaths can be divided into three stages,and the thermal weightlessness mainly occurs in the first two stages,and the weightlessness rate of the first stage is the highest.The MYQ-type sheath is the most affected by temperature,but the pyrolysis process is the slowest.The MHYV and MKVV-type sheaths are less affected by temperature,but the pyrolysis reaction is the most in-tense,and the pyrolysis process of the two types of sheaths is similar.The fire risk of MYQ-type sheath is much more than MHYV and MKVV-type sheaths.According to the calculated activation energy of pyrolysis of three types of cable sheaths,the pyrolysis reaction models of each stage for each of the sheaths are determined by the generalized master diagram method.This study can provide a reference for the study of pyrolysis and fire hazard of cable sheath materials and their safe design.
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