Експериментальне дослідження питомого електричного опору насипного шару термоантрациту

• Date: 2023
• Main Authors: Безуглий, В.А., Губинський, М.В., Коверя, А.С., Коноваленко, В.П., Кондратенко, П.В.
• Format: Article
• Language: Ukrainian
• Published: Physico-technological Institute of Metals and Alloys 2023
• Subjects: термоантрацит; електрокальцинатор; питомий електричний опір; насипний шар; контактний електричний опір; тиск у шарі
• Online Access: https://www.metalsandcasting.com/index.php/mcu/article/view/162
• Journal Title: Metal and Casting of Ukraine

The studies of the specific electrical resistance of the Donetsk anthracite bulk layer with the size of 25–6 mm under its thermal treatment in the temperatures of 800–1600 °C and at the pressures in the layer of 2–62 kPa have been presented. An effective tool used to improve electric calciners is computer modelling. It is important to use reliable input data for the model, in particular, the dependence of the specific electrical resistance of the thermoanthracite bulk layer on temperature and pressure in the layer. The specific electrical resistance of the bulk layer of lumpy carbonaceous material, in particular, thermoanthracite, depends on its particle size distribution, temperature and pressure in the layer. The known dependencies for the specific electrical resistance of the bulk layer contradict each other in terms of the nature of its change with the change in the fractional size of thermoanthracite. In regard to the above mentioned there is a practical need for additional studies of the specific electrical resistance of the thermoanthracite bulk layer. The calcined Donetsk anthracite with fraction of 25–6 mm is most frequently used in electric calciners of Ukraine, was studied in this paper. Experiments proved that the temperature treatment of the anthracite, at which the sufficient specific electrical resistance of the layer to start effective electrical heating, is 950 °C, even with a minimum pressure in the layer. The type of approximating dependence of the specific electrical resistance of the thermoanthracite bulk layer on the pressure in the layer is logarithmic with the high coefficient of determination. An approximating dependency of the specific electrical resistance of the thermoanthracite bulk layer on the temperature treatment of 800–1600 °C and pressure in the layer of 2–62 kPa has been obtained, and it will be used later for computer modelling of the electric calciners.