UPGRADE OF CONVEYOR LINE FOR COAL CHARGE PREPARATION WITH THE USE OF MODERN GRADING-AND-MIXING EQUIPMENT
Keywords:coke, crushing, screening, mixing, specific energy consumption
Introduction. In the current market conditions, when the demand for metallurgical products remains constant or declines, the metallurgical industry may develop due to optimizing operating costs. A significant component of the
cost of final products is the cost of electricity. Its average growth rate over the past five years amounted to 125%.
Therefore, there is a need for analysis of electricity consumption with its subsequent optimization.
Problem Statement. In the existing coke production process line, the most energy-intensive technological
operation is crushing coal charge, which does not provide for prior screening of the finished grade. The analysis of the particle size distribution of coal concentrates has showed that only 12.5% of the input charge fractions needs to be crushed The gross flow of coal concentrate entering the crushers, the efficiency of the crushers does not exceed 16… 18%. In addition, there is re-crushing of coal concentrates, which increases the content of the 0—0.5 mm fraction and, consequently, adversely affects the quality of resulting coke.
Purpose. The purpose of this research is to develop practical recommendations for improving the process of coal charge preparation for coking and equipment in it in order to reduce electricity consumption and to increase the quality of resulting coke.
Materials and Methods. Empirical research methods with the use of the mathematical apparatus of statistical
Results. As a result of the research, an improved process flowchart for coal charge preparation has been proposed. It allows improving the quality of blast furnace coke and reducing electricity costs per unit of product, at least, 48 times.
Conclusions. Improving the quality of coal charge preparation for sintering and reducing the electricity consumption of equipment may be implemented through upgrading the existing conveyor lines by organizing screening sections of the finished grade before crushing.
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