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Zhai X, Zhou Y, Song B, Pan W, Wang J. Comparative study on the inhibiting effect of dissolvable tiny-foam extinguishing agent and chlorine salts on coal spontaneous combustion. Environ Sci Pollut Res Int 2023; 30:80591-80601. [PMID: 37296254 DOI: 10.1007/s11356-023-27948-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 05/23/2023] [Indexed: 06/12/2023]
Abstract
Coal spontaneous combustion (CSC) is a global disaster and detrimental to the ecological environment. This study aims to better apply environmentally friendly dissolvable tiny-foam extinguisher (DTE) to CSC and look further into the inhibition mechanism. Thermogravimetric analysis and differential scanning calorimetry (TG-DSC) were employed to test the oxidation properties of coal samples treated with DTE, NaCl, MgCl2, and CaCl2 inhibitors, and the reaction mechanisms and kinetic parameters in the high-temperature stage of coal oxidation were determined. The results revealed that the inhibition of the four inhibitors was similar in the initial period of the coal oxidation, DTE increased the cracking temperature of the coal by 37 °C, mass loss was a minimum when reaching the ignition temperature, and inhibition was better than the other inhibitors at the low temperature. DTE had higher thermal stability and played a stable role in suppression at the high temperature, while chlorine salt inhibitors promoted the oxidative exothermic reaction. DTE coal sample absorbed forty times more heat during the endothermic stage than raw coal, ten times more than MgCl2, and released a minimum of heat. In the decomposition and combustion stages, the reaction mechanism of coal and oxygen conformed to the three-dimensional diffusion Z.-L.-T. equation, and the apparent activation energy of the DTE-treated coal sample was about 40 kJ/mol higher than raw coal.
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Affiliation(s)
- Xiaowei Zhai
- School of Safety Science and Engineering, Xi'an University of Science and Technology, 58, Yanta Mid. Rd, Xi'an, 710054, Shaanxi, China.
- Key Laboratory of Coal Fire Disaster Prevention and Control in Shaanxi Province, Xi'an, 710054, Shaanxi, China.
- Mine Emergency Rescue Innovation Team, The Youth Innovation Team of Shaanxi Universities, Shaanxi, China.
| | - Yujie Zhou
- School of Safety Science and Engineering, Xi'an University of Science and Technology, 58, Yanta Mid. Rd, Xi'an, 710054, Shaanxi, China
- Key Laboratory of Coal Fire Disaster Prevention and Control in Shaanxi Province, Xi'an, 710054, Shaanxi, China
- Mine Emergency Rescue Innovation Team, The Youth Innovation Team of Shaanxi Universities, Shaanxi, China
| | - Bobo Song
- School of Safety Science and Engineering, Xi'an University of Science and Technology, 58, Yanta Mid. Rd, Xi'an, 710054, Shaanxi, China
- Key Laboratory of Coal Fire Disaster Prevention and Control in Shaanxi Province, Xi'an, 710054, Shaanxi, China
- Mine Emergency Rescue Innovation Team, The Youth Innovation Team of Shaanxi Universities, Shaanxi, China
| | - Wenjun Pan
- School of Safety Science and Engineering, Xi'an University of Science and Technology, 58, Yanta Mid. Rd, Xi'an, 710054, Shaanxi, China
- Key Laboratory of Coal Fire Disaster Prevention and Control in Shaanxi Province, Xi'an, 710054, Shaanxi, China
- Mine Emergency Rescue Innovation Team, The Youth Innovation Team of Shaanxi Universities, Shaanxi, China
| | - Jiuge Wang
- School of Safety Science and Engineering, Xi'an University of Science and Technology, 58, Yanta Mid. Rd, Xi'an, 710054, Shaanxi, China
- Key Laboratory of Coal Fire Disaster Prevention and Control in Shaanxi Province, Xi'an, 710054, Shaanxi, China
- Mine Emergency Rescue Innovation Team, The Youth Innovation Team of Shaanxi Universities, Shaanxi, China
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