The effect of agglutinant concentration and type on coal-powder thermal conductivity
Abstract
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 (150μm). The k value 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). A1 represents such a value as agglutinant (x) concentration may be very big; xo 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.Downloads
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