Key Laboratory of Gas and Fire Control for Coal Mines CUMT

Tongshan, China

Key Laboratory of Gas and Fire Control for Coal Mines CUMT

Tongshan, China

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Zhou Y.,China University of Mining and Technology | Zhou Y.,Key Laboratory of Gas and Fire Control for Coal Mines CUMT | Meng Q.,Jiangsu University | Meng Q.,China University of Mining and Technology | And 4 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2014

Based on a virtual concept named "truncation temperature", a numerical simulation method for spontaneous combustion in gob was proposed. The basic assumptions of the method are as follows. Firstly, take the critical temperature (normally, about 70 ℃) of coal spontaneous combustion as truncation temperature. Secondly, the rate of coal oxidation reaction is no longer on the rise with the increase of temperature while coal temperature reaches or exceeds the truncation point during simulation. Thirdly, after the simulation reaches convergence, the area where coal temperature reaches or exceeds the truncation temperature is delimited as the spontaneous combustion zone. Further analysis shows that its physical meaning is maximum possible range of spontaneous combustion in gob. Through this method, the simulation analysis is carried out for the distribution of spontaneous combustion zone in the context of practical gob. The results of simulation and field observation are similar, which proves the applicability of the method. ©, 2014, China University of Mining and Technology. All right reserved.


Wang H.-T.,China University of Mining and Technology | Wang H.-T.,Key Laboratory of Gas and Fire Control for Coal Mines CUMT | Wang D.-M.,China University of Mining and Technology | Wang D.-M.,Key Laboratory of Gas and Fire Control for Coal Mines CUMT | And 2 more authors.
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2011

In order to reveal the coal spontaneous combustion characteristics of the Dafosi coal mine, the low-temperature oxidation process of Dafosi coal was tested by the programmed heating-up method based on industrial analysis and spontaneous combustion tendency identification of the sample coal. The characteristics of oxidation product concentration versus the temperature variation, such as CO, CO 2, CH 4, C 2H 6, C 3H 8 and C 2H 4, were obtained. And the relationships between appearance sequence of gases products and oxidation state of coal were analyzed. Test results show that CO is the most sensitive product in the process of spontaneous combustion of Dafosi coal, which can indicate the low-temperature oxidation characteristics of coal. The CO should be regarded as the main index gas to decide the status of spontaneous combustion, and C 2H 6, C 3H 8, C 2H 4 and C 2H 2 may be used to master the process of coal oxidation and spontaneous combustion. Accordingly, positive and effective measures of fire prevention and extinguishing can be taken in time.

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