Yalovaya K. Increasing of the energy efficiency of electric arc furnaces

Subject of a study is heat and mass exchange of the meltings, which occur with the thermal work of arc furnaces. Purpose of a study is development of the theoretical bases of heat and mass exchange in connection with the processes of melting in the electric-arc furnaces. Methods of study are mathematical simulations: numerical finite-difference method, the method of integral identities (method of control volume) upon transfer to the finite-difference analogs of the corresponding differential equations. Theoretical and practical results - processes of heat mass exchange and the mechanisms of the transfer of the heat, which occur in each stage of thermal work of arc steel maiking furnaces with regard for its thermophizical features. The scientifically grounded recommendations relative to an increase of the effectiveness of using the energy resources during the electrosmelting in the industrial conditions are developed. Novelty - the functional connection of the convective heat exchange between outgoing furnace gas, liquid metal flowing to the sole, convective-radiation heat exchange with the environment and the radiation heat exchange with the electrodes in the total heat balance of the melting is for the first time determined. This determinations are providing the more substantiated calculations of the heat and mass exchange processes' in the working space of arc furnaces. The degree of introduction - results are used in DE "Dneprodzerzhinsk staleplavilnuy zavod" of joint stock company "Dneprovagonmash" Dneprodzerzhinsk with the yearly economic effect of 72000 grn.; in the science and production association "Dneproenergostal" Zaporozhye. Field of uses - metallurgical industry.