Theoretical analysis of coal stockpile self-heating

Hooman, Kamel; Maas, U.

doi:10.1016/j.firesaf.2014.05.011

Cited by 39 publications

(15 citation statements)

References 20 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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“…A double porosity material is one that exhibits usual macro pores, but additionally contains a system of micro pores due to cracks or fissures in the porous skeleton. Such theories have applications to many important areas such as chemical engineering, Enterría et al, 1 Huang et al, 2 Ly et al, 3 ; in landslides, Borja et al, 4 Scotto di Santolo and Evangelista, 5 ; in self ignition of stockpiled coal, Hooman & Maas, 6 ; in land drainage and ensuring stormwater runoff does not pollute, Haws et al, 7 Jensen et al, 8 ; in ensuring clean drinking water from an aquifer, Ghasemizadeh et al, 9 Fretwell et al, 10 ; and there are many others.…”

Section: Introductionmentioning

confidence: 99%

Continuous dependence on boundary and Soret coefficients in double diffusive bidispersive convection

Franchi

Nibbi

Straughan

2020

Math Methods in App Sciences

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We develop a theory for double diffusive convection in a double porosity material along the Brinkman scheme. The Soret effect is included whereby a temperature gradient may directly influence salt concentration. The boundary conditions on the temperature and salt fields are of general Robin type. A number of a priori estimates are established whereby, through energy arguments, we prove continuous dependence of the solution on the Soret coefficient and on the coefficients in the boundary conditions in the L2‐ norm.

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“…We finally mention stockpiling of coal where relatively small pieces of coal are stockpiled but the individual pieces contain cracks or small pores. Piles of coal may self combust and so an understanding of heat transfer in this case is vital, see Hooman & Maas [15], Hooman et al [16].…”

Section: Introductionmentioning

confidence: 99%

Effect of inertia on double diffusive bidispersive convection

Straughan

2019

International Journal of Heat and Mass Transfer

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Convection thresholds in a saturated bidisperse porous material are calculated in the presence of a non-zero coefficient of inertia, the acceleration coefficient, for the fluid velocity in the macro pores. We concentrate on the case where the layer is heated from below and simultaneously salted from below. The effect of increasing the size of the acceleration coefficient is generally to increase the critical Rayleigh number above which convective motion commences, although the precise values depend on the interaction coefficient between the micro and macro pores, the porosities, and the Lewis number.

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Theoretical analysis of coal stockpile self-heating

Cited by 39 publications

References 20 publications

The fire extinguishing performances of foamed gel in coal mine

The fire extinguishing performances of foamed gel in coal mine

Continuous dependence on boundary and Soret coefficients in double diffusive bidispersive convection

Effect of inertia on double diffusive bidispersive convection

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