Study on the law of gas releasing in the process of coal oxidation and war ming-up

Abstract：In order to prevent spontaneous combustion of coal, deeply understand laws of the gases releasing in the process of warming-up, a warming-up experimental study for the group of Taiyuan and the group of Shanxi is made with the experimental system of coal warming-up and oxidation.The results show that: in the process of warming-up and oxidation for the Taiyuan Group and the Shanxi Group, different types of gas have different critical temperature and release rate.Coal oxidation process slowly in the temperature of 20-160℃, which firstly slowly releases material of C1, for example CO, CO2, CH4 and C2-C3 olefins C2H4, C3H6 that is adsorbed.The temperature of 160-210℃ is the process of oxidation rapidly, the coal releases a large-scale of the C2-C4 alkenes C2H6, C3H8 and C4H10, the exponential relationship between the release rate increase.The temperature of 210-280 ℃ for the rapid oxidation of coal, the C1-C4 gas releases rate almost linear relations between increased dramatically.Different types of coal in different stages has different oxidation characteristics, which are all can be choosen as forecast signs of spontaneous combustion of coal.

Keyword：coal of Taiyuan Group;coal of Shanxi Group;warming-up;oxidation;