Dubyna O. Development of Resource-Saving Regimes for Steel Ingots and Billets Solidification and Heating.

Departing from the literature analysis and the theoretical and experimental research into solidification, cooling and heating of the ingots and billets, temperature and heat regimes for flame furnaces have been developed and improved. The furnaces are utilized in metallurgical production and are presented in different designs: recuperative heating wells, circular and continuous furnaces. For the purpose of reaching the aims of the dissertation the nonlinear equations of thermal physics and heat engineering for metallurgical production have been formulated and solved. The above mentioned equations are developed for the processes of solidification and cooling the blooming ingot, of heating cylindrical and prismatic billets in flame furnaces of different designs. The method of equivalent sources and computer modeling on the basis of absolutely stable obvious terminal-randomized scheme of Dufor-Frankle was used for mathematical realization of the equations. All the theoretical developments are adapted to t he currently operating heat technological units and facilities, which proves their reliability and practical value. The main results of the research are manifested in the improved temperature and heat regimes of metallurgical production that have been implemented at a number of the greatest metallurgical complexes of Ukraine: Krivorozstal, Dneprovsky and Alchevsky Works. Implementation of the research developments resulted in the reduction of the specific loss of conventional fuel, lower level of drossing and higher productivity of heat engineering facilities.