Resumen

BAUTISTA RUIZ, Jorge Hernando; PENA RODRIGUEZ, Gabriel  y  APERADOR CHAPARRO, William. THE EFFECT OF AGGLUTINANT CONCENTRATION AND TYPE ON COAL-POWDER THERMAL CONDUCTIVITY. Cienc. Ing. Neogranad. [online]. 2011, vol.21, n.1, pp.17-28. ISSN 0124-8170.

This paper reports a thermal conductivity (k) given an environment temperature of thermal coal powder as a function of agglutinant concentration and type -i.e. water, alcohol, diesel- which changed their weight percentage (%wt) between 5-and-40 percent. Samples were obtained from Cerro Tasajero, a mine located at San Jose de Cucuta metropolitan area, which were pulverized manually using roller mill and sifted by a mesh No. 100 (150um). The /rvalue was determined using the physical principle of temporary linear heat flow by system KD2^® Thermal Properties Analyzer (Decagon Devices, Inc.) The ash percentage in the sample was given by norm ASTM D 3174, providing a value of 1.75 percent. The sulfur concentration was obtained using norm ASTM 3177, reporting a value of 0.45 percent, while the percentage of matter volatile in the sample was 34.17 percent by applying norm ASTM 3175. The analysis of k as a function of agglutinant type and concentration was carried out adjusting the experimental data based on the logistical function where A₂ corresponds to values of the thermal property (y) for an initial concentration of agglutinant (x). Ai represents such a value as agglutinant (x) concentration may be very big; x₀ reveals the point where bend is changing and n the reason of growth or falling. The results in this experience could be used to develop other studies in order to produce high-pressed coal powder cylinders, which will be used in industrial burning processes by sintering ceramic goods, such as roof tile, block and wall tile.

Palabras clave : thermal coal; thermal conductivity; transient linear heat flow.

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