The Process of Heat Transfer in a Coal Bed with Variation Thermophysical Properties

• Published in: High temperature Vol. 61; no. 3; pp. 358 - 364
• Main Authors: Abdulagatov, I. M., Ramazanova, A. E.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-06-2023; Springer Nature B.V
• Subjects: Atoms and Molecules in Strong Fields; Beds (process engineering); Classical and Continuum Physics; Coal; Diffusivity; Heat and Mass Transfer and Physical Gasdynamics; Heat transfer; Industrial Chemistry/Chemical Engineering; Laser Matter Interaction; Materials Science; Physical Chemistry; Physics; Physics and Astronomy; Pyrolysis; Specific heat; Temperature dependence; Temperature distribution; Thermal conductivity; Thermal decomposition; Thermal diffusivity; Thermophysical properties
• ISSN: 0018-151X; 1608-3156
• DOI: 10.1134/S0018151X23030069

New experimental thermodynamically consistent data are presented on the temperature dependence of thermal diffusivity, heat capacity, and thermal conductivity (λ =
a
ρ
C
p
) of black coal calculated on their basis. The effect of the thermal decomposition (pyrolysis) of coal near 700 K and evaporation of moisture and other easily volatile components of coal at 380 K on the behavior of heat capacity and thermal conductivity was studied experimentally. The measurements were carried out using the contact-free laser flash (Netzsch LFA 457) method in the temperature range 301–823 K. Based on the measured values of the thermal diffusivity of black coal, the heat transfer process in a coal bed was studied. It is shown that taking into account the temperature dependence of the thermal diffusivity of the medium when solving the heat transfer equation significantly affects the temperature distribution in the coal bed.