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Revista Facultad de Ingeniería
versión impresa ISSN 0121-1129
Resumen
PENA-RODRIGUEZ, Gabriel; FERRER-PACHECO, Martha Yasmid y DULCE-MORENO, Héctor Jaime. The Heat Treatment's Effect on the Morphology and the Flying Ash Thermal Conductivity from the Coal Combustion. Rev. Fac. ing. [online]. 2014, vol.23, n.37, pp.85-92. ISSN 0121-1129.
This paper presents the heat treatment's effect, on the effective thermal conductivity (ke) at room temperature, of the flying dust ashes, from the Termotasajero S.A's coal combustion thermoelectric. The above mentioned thermo-physical parameter, was measured using the Thermal Properties Analyzer KD2Pro® system, which works with the linear transitory heat flow's physical principle. The samples' heat treatment, were performed using an electrical muffle Ney® Vulcan D-130 for the 1050, 1100, 1130, 1200, 1250 and 1300 °C's temperature ranges. The porosity and the apparent density were found using the standard NTC 4321-3. The samples' superficial morphology was analyzed using a scanning electronic microscopy (SEM). Our results show that as the temperature increased in the heat treatment, the samples changed color from a dark brown to a beige gray. It also decreased the porosity percentage, due to the vitrification process, increasing the density too, and consequently the thermal conductivity effectiveness. The ke values found are very important for the thermal transmittance calculations' coefficient (U-value), in the heat transfer processes, where these ashes are used.
Palabras clave : Effective Thermal Conductivity; Fly Ash; Thermal transmittance; Cinzas volantes; Condutividade térmica efetiva; Transmitância térmica.