Numerical simulation for recognition of coalfield fire areas by Rayleigh waves

Hu, Mingshun; Pan, Dong; Chen, Shen-En; Dong, Shouhua; Li, Juanjuan

doi:10.1016/j.ijmst.2013.01.005

Cited by 5 publications

(2 citation statements)

References 17 publications

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“…The temperature of T2 and T3 rapidly declines, but the temperature of T1 reduces slowly. This is because the coal fire belongs to the state of three-dimensional combustion, though the flame is inhibited and the temperature is declined, the combustion within the coal heap still continues in a smoldering fire state (Zeng et al 2010;Hu et al 2013;Hooman and Mass 2014). With increase in the volume of foamed gel, it flows gradually through the coal heap gap and covers the inner coal, inhibiting and extinguishing the smoldering fire.…”

Section: Changes Of Temperature Fieldsmentioning

confidence: 99%

The fire extinguishing performances of foamed gel in coal mine

et al. 2016

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Experiments have been made to investigate how mass concentrations of thickener and crosslinker blends and foaming multiple affect temperature resistance of foamed gel. The results show that, at 100°C, the time for temperature tolerance of common foam is only 196 s, while the time of foamed gel formed by thickener and crosslinker with the mass fractions of both 0.3, 0.4 and 0.5 % is 570, 604 and 780 s, respectively. When the foaming multiple is 5, the time for temperature resistance is 620 s. But the time reduces to 360 s as the foaming multiple increases to 30. Furthermore, researches are also conducted on the extinguishing effect of foamed gel. It can be known from the results that, when putting out the coal fire with similar size, the volume of foamed gel used is only one-ninth of that of common foam and the extinguishing time is less than half of common foam. With increasing in the mass concentration of thickener and crosslinker blends, the extinguishing time first shortens and then prolongs. When the mass fraction of complex solution mixed by thickener and crosslinker is 0.6 %, the extinguishing efficiency is the highest. If the foaming multiple is 5, the extinguishing time is the shortest. However, the time remains constant when the foaming multiple is over 20.

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Section: Changes Of Temperature Fieldsmentioning

confidence: 99%

The fire extinguishing performances of foamed gel in coal mine

et al. 2016

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“…The location of coalfield fire is another focal point in research. Several methods have been created to recognize coalfield fire, including geographic information systems (GIS), numerical simulation, and thermal infrared spectroscopy [14][15][16][17]. All these methods have laid a solid basis for the prevention and control of coalfield fire.…”

Section: Introductionmentioning

confidence: 99%

Experimental research on temperature variation and crack development in coalfield fire

Fei¹,

wen²

2017

IJHT

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With the destruction of numerous coal seams around the world, coalfield fire is becoming a matter of global concern. This paper probes into the crack features of rock strata in a coalfield fire-stricken area, to answer to call for energy conservation and environmental protection. Specifically, the temperature variation was investigated through simulation experiments based on the coal seam model and rock strata model, and the crack development was qualitatively researched on the surface of coal seam and the overlying strata. The main conclusions are as follows. Comparing the temperature of measuring points on the same horizontal plane, it is concluded that the temperature of the coal seam above the heat source increased with the distance from the heat source within a certain range. The temperature diffusion was rather slow in coal and rock and the fire source movement was very time-consuming. The surface temperature variation of the overlying strata was similar to that of the fire source, indicating that the fire source could be roughly located by the surface temperature variation of the overlying strata. Meanwhile, the thermal destruction resulted from high temperature boosted the crack development in both coal seam and rock strata, and collapse occurred when the coal burned out. During the coalfield fire, the crack development was bolstered by the high temperature produced in the interaction between the crack field and the temperature field; besides, the cracks created a passage for oxygen supply, which favours the coal combustion. All in all, the coalfield fire development was enhanced by the interaction between the crack field and the temperature field.

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Numerical simulation and disaster prevention for catastrophic fire airflow of main air-intake belt roadway in coal mine—A case study

Zhou

Cheng

Zhang

et al. 2015

J. Cent. South Univ.

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Coal mine belt fire develops very rapidly and is difficult to control. If not suppressed quickly, a belt fire could easily lead to airflow disorder and undermine the ventilation system. However, belt fire can be prevented effectively by establishing fire airflow control system. In this work, the 5th belt roadway of Kongzhuang coal mine was taken as the object of investigation, where geometrical models of this roadway were established firstly. Then, based on mathematical model of fire smoke flow, the CO volume fraction, smoke density distribution, air temperature and pollutant velocity vector in the roadway before and after taking airflow control measures were simulated by using Fluent software. It can be known from the simulation that with the normal ventilation status in 5th belt roadway, the countercurrent of smoke does not happen when a fire occurs; the roadway's section is almost filled with CO at 10 m downstream from the fire source, and with air velocity getting stable gradually, the CO concentration reaches about 15 %. After taking airflow control measures, the effect range of temperature field which are harmful to the miners decreases from 69 m to 30 m; and the distance of the roadway fully filled with CO is 5 m farther than that before taking measures. Finally, according to the numerical simulation results and the actual condition of the belt roadway, the warning and automatic remote airflow control system with short-circuit method for the 5th belt roadway was designed to guarantee the safety production.

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Numerical simulation for recognition of coalfield fire areas by Rayleigh waves

Cited by 5 publications

References 17 publications

The fire extinguishing performances of foamed gel in coal mine

The fire extinguishing performances of foamed gel in coal mine

Experimental research on temperature variation and crack development in coalfield fire

Numerical simulation and disaster prevention for catastrophic fire airflow of main air-intake belt roadway in coal mine—A case study

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