Influence of pressure on the effective thermal conductivity and electrical resistivity of coke

The influence of pressure on the effective thermal conductivity and electrical resistivity of coke is investigated. The scope of the investigation includes analysis of the relevant literature; measurement of the thermal conductivity and electrical resistivity of coke with different granulometric composition as a function of the temperature, at different pressures; and the derivation of regression equations for the experimental results. The temperature dependence of the coke’s thermal conductivity is measured by the standard coaxial-cylinder method. The electrical resistivity of coke is measured by a two-probe potentiometric method. Coke of the ≤2 mm and 6–8 mm classes is used in the thermal tests, with a temperature range of 200–1000°C, at pressures of 0–68 kPa. Coke of the 0–10 mm class is used in the electrical tests, with a temperature range of 30–800°C, at pressures of 1.5–40 kPa. A second-order polynomial for the temperature, mean particle size, and pressure is derived as the regression equation for the thermal conductivity. A polynomial formula is derived for the electrical resistivity of coke at pressures of 13–40 kPa.