Library Subscription: Guest
ICHMT DL Home Current Year Archives Executive Committee International Centre for Heat and Mass Transfer

COUPLED MULTI-STAGE OXIDATION AND THERMODYNAMIC PROCESS IN COAL-BEARING STRATA UNDER SPONTANEOUS COMBUSTION CONDITION

DOI: 10.1615/ICHMT.2015.IntSympAdvComputHeatTransf.810
pages 927-938

Yanming Wang
School of Safety Engineering, China University of Mining and Technology, Xuzhou, China; Dept. of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, Piscataway, USA

Guoqing Shi
School of Safety Engineering, China University of Mining and Technology, Xuzhou, China; Dept. of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, Piscataway, USA

Zhixiong Guo
Department of Mechanical and Aerospace Engineering, Rutgers, The State University of New Jersey, Piscataway, NJ 08854, USA

Abstract

Spontaneous combustion of subsurface coal is an extremely complicated chemical and physical changing process. In order to quantitatively understand the development of underground coal fires, the heat transfer processes coupled with multi-stage oxidation of coal are investigated by experimental and numerical methods in this paper. With controlled temperature and under lean oxygen conditions, the chemical thermodynamic parameters of coal oxidation on different stages are measured utilizing the simultaneous thermal analysis. Employing the composite boundary conditions, a heat transfer model with finite reactions for porous coal and rock is developed to simulate the thermal dynamical process in coal-bearing strata. The temperature fields of coal and roof strata at different times are estimated based on single- and two-stage oxidation kinetic models, respectively. The effects of the oxidation kinetic properties due to coal metamorphism on propagation of coal fires are examined and compared. It demonstrates that there exists a significant step change during the thermal process of coal fire caused by multi-stage oxidation, and the coal rank of occurrence directly determines the spontaneous combustion period of underground coal fire.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH