Electric calciner control in the production of carbon products

A comparative analysis of technical and economic indicators as criteria for optimal electric calciner control has been done. It is shown that the use of the considered factors has some drawbacks resulting from the operating conditions. The modified factor of specific operating costs as the factor, that makes it possible to fully evaluate heat treatment of carbon materials in electric calciner efficiency has been proposed. The use of the electric calciner in the production of carbon products has been substantiated. Mathematically formulated control task setting includes selected optimality criterion and limitations. Optimality criterion based on the specific operating costs and takes into account costs that depend on technological mode and actual electric calciner performance. The specific operating costs includes material costs of raw materials, energy costs for carbon materials movement in electric calciner and for material heating by Joule heat. Actual electric calciner performance defined as the part of all processed material that has good quality. Limitations consist of material electrical resistivity at the outlet of the apparatus limitation, the temperature of heat treatment limitation, electric power applied to the electrodes limitation and material heat treatment time in electric calciner limitation. Using these limitations when creating control system allows to keep product quality specified value and take into account device design features, carbon material and material heat treatment process in electric calciner features. Control task solving should provide optimally carbon materials heat treatment process functioning in terms of resource and energy saving mode and as a result, improve production of carbon products efficiency in general