Experimental and in-situ estimation on hydrogen and methane emission from spontaneous gasification in coal fire

Wang, Yanming; Wang, Wenzheng; Guo, Zhixiong

doi:10.1016/j.ijhydene.2017.04.192

Cited by 31 publications

(10 citation statements)

References 23 publications

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“…The mixture was then carefully transferred to a mould and compressed to yield a clear sheet, about 0.8 mm in thickness. 34 –38…”

Section: Methodsmentioning

confidence: 99%

Influence of synthetic conditions on the performance of melamine–phenol–formaldehyde resin microcapsules

Cheng

et al. 2018

High Performance Polymers

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Melamine (M), phenol (P) and formaldehyde (F) were used as raw materials to synthesize a melamine–phenol–formaldehyde resin (MPF) which was used as shell material to prepare a self-healing microcapsule with E-51 epoxy resin as the core, via in situ polymerization. Fourier transform infrared spectroscopy, environmental scanning electron microscopy and laser particle size analysis were used to characterize the surface morphology, structure and properties of the microcapsule. The influence of the reaction conditions on the properties of the microcapsule was investigated by orthogonal testing. The mass ratio between the MPF shell and the epoxy resin core was found to be 1.2:1.0, optimum pH for shell formation was found to be 3, the emulsification speed was 800 r/min, the acidification speed was 400 r/min and the acidification temperature was 60°C. Under these conditions, the prepared microcapsules are regular and spherical with a smooth, dense surface and uniform particle size with a normal distribution. The microcapsules remained well dispersed and did not aggregate. The orthogonal test revealed that the average particle size and yield of the microcapsules are mainly determined by the core/shell mass ratio, whereas the reaction temperature had a greater impact on the core content of the microcapsules. Although the best microcapsule samples showed poor anti-permeability in ethanol, they exhibited good thermal, isothermal and storage stabilities. This indicates that they may be stored at a constant temperature.

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“…The mixture was then carefully transferred to a mould and compressed to yield a clear sheet, about 0.8 mm in thickness. 34 –38…”

Section: Methodsmentioning

confidence: 99%

Influence of synthetic conditions on the performance of melamine–phenol–formaldehyde resin microcapsules

Cheng

et al. 2018

High Performance Polymers

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“…The initiation of a fire in an underground space releases large amounts of heat and pollutants that could create a lethal atmosphere and explosive gases during the combustion process [25]. Distance and airflow direction play a key role in the amount of CO and CO 2 and temperature changes [26], while the slope of the drift also has an important influence in the direction of the pollutants generated [23,27].…”

Section: Mine Fires In Undergorund Coal Minesmentioning

confidence: 99%

Analysis of the Fire Propagation in a Sublevel Coal Mine

et al. 2020

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A fire has been analyzed in a real underground coal mine, using a sublevel method, during an entire year. The study was focused on the collapsed area, reproducing a real mixture formed by coal, waste, and air gap. The analysis was done by means of an experimental analysis, a computational fuid dynamic model (CFD), and simulations using a mine ventilation software. Three scenarios were determined and studied regarding their influence on the evolution of the fire: (a) development of the fire without taking any action, (b) sealing off the affected areas, and (c) sealing and reducing the ventilation in the affected area and surrounding drifts. The study revealed the behavior of the fire in a real mine and the effectiveness of the main fire-fighting measures over time, verifying that none of the measures taken could eliminate the fire-induced in the collapsed area.

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“…Fires may even persist for months in circumstances where the fire outbreak is of a specific kind and isolated [1,2]. The process of combustion related to the fires, besides generating heat [3,4], causes the production of combustion products (including carbon monoxide and sulphur dioxide)-gases that are poisonous for a human [4][5][6][7][8][9]-as well as those that are explosive (methane, hydrogen) [10]. Additionally, the gases produced cause a decrease of oxygen concentration in the mine atmosphere.…”

Section: Introductionmentioning

confidence: 99%

Reversal Ventilation as a Method of Fire Hazard Mitigation in the Mines

et al. 2020

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Reversal ventilation is one of prevention methods against fire hazard in underground mines, but it is not recommended for the mines where methane is present. The authors introduce the new method of reversal and by conducting numerical simulations they prove that it allows to keep methane at the acceptable level during miners escape. However, it requires connection between the subnetworks of the main ventilation fans. It was also shown, that by using the method some escape routes will be shortened. It is possible to apply this method in the mines where the fans and stoppings are fully controlled across the full range of their operating parameters. The findings are important for underground mines, as well as for surface facilities where air control or smoke control is managed by two or more fans.

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Experimental and in-situ estimation on hydrogen and methane emission from spontaneous gasification in coal fire

Cited by 31 publications

References 23 publications

Influence of synthetic conditions on the performance of melamine–phenol–formaldehyde resin microcapsules

Influence of synthetic conditions on the performance of melamine–phenol–formaldehyde resin microcapsules

Analysis of the Fire Propagation in a Sublevel Coal Mine

Reversal Ventilation as a Method of Fire Hazard Mitigation in the Mines

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