Numerical modelling of the self-heating process of a wet porous medium

被引：62

作者：

Ejlali, A. ^{[1
]}

Mee, D. J. ^{[1
]}

Hooman, K. ^{[1
]}

Beamish, B. B. ^{[1
]}

机构：

[1] Univ Queensland, Sch Mech & Min Engn, Brisbane, Qld 4072, Australia

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2011年 / 54卷 / 25-26期

关键词：

Self-heating in moist porous material; Buoyancy; Porosity; Coal stockpile; Oxidation; SPONTANEOUS COMBUSTION; NATURAL-CONVECTION; MASS-TRANSFER; COAL; IGNITION; TEMPERATURE; STOCKPILES; DIFFUSION; TRANSPORT; MOISTURE;

D O I：

10.1016/j.ijheatmasstransfer.2011.08.025

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In this research, the shortcomings of some advanced models for heat and fluid flow and moisture transport within and around a reactive porous medium (a coal stockpile) are numerically investigated based on a local thermal non-equilibrium approach and results are compared with experimental data. A full account of the problem is presented, including transient variation of the maximum temperature in the medium and the time required to vaporize the water content. The former is the main parameter used in the study of spontaneous self-ignition of coal stockpiles and the latter is an indication of the last step of self-heating toward self-ignition. Correlations are developed for the maximum dimensionless temperature inside the pile when the moisture content is near zero and the time that it takes from the beginning of self-heating until this time as functions of porosity, permeability, moisture content and the overall size of the porous medium. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：5200 / 5206

页数：7

共 31 条

[21] The overall activation energy of the exothermic reactions of thermally unstable materials [J].

Malow, M ;

Krause, U .

JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES, 2004, 17 (01) :51-58

[22] Numerical Heat Transfer Coupled with Multidimensional Liquid Moisture Diffusion in Porous Textiles with a Measurable-Parameterized Model [J].

Mao Aihua ;

Li Yi .

NUMERICAL HEAT TRANSFER PART A-APPLICATIONS, 2009, 56 (03) :246-268

[23] Kinetics of water adsorption/desorption on bituminous coals [J].

McCutcheon, AL ;

Barton, WA ;

Wilson, MA .

ENERGY & FUELS, 2001, 15 (06) :1387-1395

[24] THE IGNITION OF COMBUSTIBLE MATERIAL IN THE PRESENCE OF A DAMP ATMOSPHERE [J].

MCINTOSH, AC ;

GRAY, BF ;

WAKE, GC .

PHYSICS LETTERS A, 1994, 191 (1-2) :61-70

[25] Convective drying analysis of three-dimensional porous solid by mass lumping finite element technique [J].

Murugesan, K. ;

Lo, D. C. ;

Young, D. L. ;

Chen, C. W. ;

Fan, C. M. .

HEAT AND MASS TRANSFER, 2008, 44 (04) :401-412

[26]

Nelson MI, 2007, REV ENG GEOL, V18, P31, DOI 10.1130/2007.4118(04)

[27]

Nield DA, 2006, CONVECTION POROUS ME, V3

[28] Determination of Spontaneous Combustion in Industrial-scale Coal Stockpiles [J].

Ozdeniz, A. H. .

ENERGY SOURCES PART A-RECOVERY UTILIZATION AND ENVIRONMENTAL EFFECTS, 2010, 32 (07) :665-673

[29] Spontaneous combustion of carbonaceous stockpiles. Part I: The relative importance of various intrinsic coal properties and properties of the reaction system [J].

Smith, MA ;

Glasser, D .

FUEL, 2005, 84 (09) :1151-1160

[30]

Tanehill J., 1997, COMPUTATIONAL FLUID

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