Influence of Molasses on the Explosion and Decomposition Properties of the Coal Dust Deposited in Underground Mines

Jianguo Liu (), Minglei Lin (), Longzhe Jin, Gang Li, Shengnan Ou, Yapeng Wang, Tianyang Wang, Mulati Jueraiti, Yunqi Tian and Jiahui Wang
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Jianguo Liu: NHC Key Laboratory for Engineering Control of Dust Hazard, University of Science and Technology Beijing, Beijing 100083, China
Minglei Lin: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Longzhe Jin: NHC Key Laboratory for Engineering Control of Dust Hazard, University of Science and Technology Beijing, Beijing 100083, China
Gang Li: State Key Laboratory of Safety and Health for Metal Mine, Maanshan 243000, China
Shengnan Ou: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Yapeng Wang: College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
Tianyang Wang: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Mulati Jueraiti: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Yunqi Tian: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China
Jiahui Wang: School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China

Energies, 2023, vol. 16, issue 6, 1-15

Abstract: Coal dust endangers the health and safety of workers in underground coal mines. Therefore, developing coal dust suppressants with dust prevention and explosion-proof properties is critical. The influence of molasses on the explosion and decomposition of the coal dust deposited in underground mines was investigated using 20 L explosion experiments and thermogravimetric and differential thermal analysis (TG-DTA). Findings reveal that, first, molasses can weakly promote the explosion of coal dust at low coal dust concentrations (<400 g/m 3 ) but has no significant effect on the explosion at high coal dust concentrations (≥400 g/m 3 ). Second, the decomposition process of the coal dust mixed with molasses has three stages: the moisture evaporation stage (0–150 °C), the molasses decomposition stage (150–300 °C), and the coal dust decomposition stage (300–500 °C). Molasses oxidation consumes oxygen and releases heat; at low coal dust concentrations, the released heat can promote coal dust decomposition to produce combustible gas, enhancing the coal dust explosion; at high coal dust concentrations, under the co-influence of the heat generation and oxygen consumption, molasses has no effect on the coal dust explosion. This is the mechanism of which molasses influences coal dust explosions.

Keywords: coal dust; molasses; coal dust explosion; suppression performance; TG-DTA (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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