China Safety Science Journal ›› 2021, Vol. 31 ›› Issue (2): 33-39.doi: 10.16265/j.cnki.issn 1003-3033.2021.02.005

• Safety engineering technology • Previous Articles     Next Articles

Research on grading and early warning of coal spontaneous combustion based on correlation analysis of index gas

TAN Bo1, SHAO Zhuangzhuang1, GUO Yan1, ZHAO Tong1, ZHU Hongqing1, LI Chuanxing2   

  1. 1 School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China;
    2 Xuzhou Petro China Kunlun Natural Gas Pipeline Network Co.,Ltd.,Xuzhou Jiangsu 221009,China
  • Received:2020-11-20 Revised:2021-01-11 Online:2021-02-28 Published:2021-08-18

Abstract: In order to warn occurrence of coal spontaneous combustion accurately, relationship between index gas and temperature was obtained based on temperature-programmed test. Starting temperature V0 and carbon oxide ratio at characteristic temperature points V1, V2, and V3 were taked as warning limit, a 4-level early warning mechanism was set. Gray correlation analysis method was used to correlate CO gas volume fraction and carbon oxide ratio in the goaf and the upper corner, and 4-level early warning mechanism was refined according to level of correlation. At the same time, a typical case was selected and early warning process under early warning mechanism was shown in detail. The results show that correlation coefficient of the time series point (133) CO volume fraction is 0.481 2,correlation level is D level and correlation is poor, while correlation coefficient of carbon oxide ratio is 0.997 5, correlation level is a level and correlation is strong, comprehensive judgment is more relevant. Strong (Da), a blue level II early warning is issued.

Key words: coal spontaneous combustion, temperature-programmed test, index gas, correlation analysis, grading and early warning

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