Title: A multi-index-classified early warning method for spontaneous combustion of coal under air leakage blocking

Authors: Hu Wen; Yin Liu; Jun Guo; Yongfei Jin; Xuezhao Zheng

Addresses: College of Safety Science and Engineering, Xi'an University of Science and Technology, Shaanxi 710054, China; Key Laboratory of Western Mine and Hazard Prevention, 58, Yanta Mid. Rd., Xi'an, Shaanxi 710054, China ' College of Safety Science and Engineering, Xi'an University of Science and Technology, Shaanxi 710054, China; Key Laboratory of Western Mine and Hazard Prevention, 58, Yanta Mid. Rd., Xi'an, Shaanxi 710054, China ' College of Safety Science and Engineering, Xi'an University of Science and Technology, Shaanxi 710054, China; Key Laboratory of Western Mine and Hazard Prevention, 58, Yanta Mid. Rd., Xi'an, Shaanxi 710054, China ' College of Safety Science and Engineering, Xi'an University of Science and Technology, Shaanxi 710054, China; Key Laboratory of Western Mine and Hazard Prevention, 58, Yanta Mid. Rd., Xi'an, Shaanxi 710054, China ' College of Safety Science and Engineering, Xi'an University of Science and Technology, Shaanxi 710054, China; Key Laboratory of Western Mine and Hazard Prevention, 58, Yanta Mid. Rd., Xi'an, Shaanxi 710054, China

Abstract: Judging development trends in coal spontaneous combustion (CSC) accurately has long been a global problem. Once a CSC phenomenon is found, the coal temperature tends to reach or exceed the critical temperature. To address this problem, the CSC characteristic parameter testing device is used to simulate the air reduction environment after the coal low temperature oxidation reaches the critical temperature, and long-flame coal was tested. The results show that the gas index can be used to judge the development trend and the characteristic temperature point for the initial stage of CSC. The development of oxidation at low temperature can be effectively predicted by using the composite indexes-Graham (G), CO/CO₂ and 100× (C₂H₄/CO). Based on this information, a multi-index early warning method for comprehensive classification was proposed. The results have guiding significance for determining the development trend of CSC fires and fire prevention and extinguishing work. [Received: August 10, 2019; Accepted: May 26, 2020]

Keywords: coal spontaneous combustion; CSC; air volume reduction; fire trend determination; classification warning; spontaneous combustion index.

DOI: 10.1504/IJOGCT.2021.115547

International Journal of Oil, Gas and Coal Technology, 2021 Vol.27 No.2, pp.208 - 226

Received: 10 Aug 2019
Accepted: 26 May 2020
Published online: 08 Jun 2021 *

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