The energy efficiency of the integrated steel plant is studied basing on the Intensive Energy Conservation Methodology. The primary diagnostics of the energy efficiency of the integrated steel plant is carried out. The boundaries of the object of study are established from iron ore deposits to the finished steel cold-rolled sheet. The research object is presented in the form of a directed graph, and the flows of materials in this network are calculated. The thermophysical heat absorption of materials and intermediates within the boundaries of a closed heat engineering complex has been estimated. The energy intensity of the cold-rolled steel sheet within the same boundaries has been calculated. Efficiency of production was estimated by comparing heat consumption and energy intensity. The complete intensive energy conservation reserve in the complex has been determined. Reserve structure is studied and directions of its implementation are discussed. It is shown that the most complete implementation of the energy-saving reserve is possible only with the transition of a new generation of steel engineering and technology.

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A mathematical model the energy balances the process thermal decomposition methane under cooling conditions high-temperature installations is proposed. The model under study allows us to evaluate the possibility using regenerative heat use, in order to reduce heat losses through the fence a high-temperature installation by utilizing the heat of the liquid coolant, allowing to increase the productivity the high-temperature process. Natural gas as an energy carrier has a lot advantages and in comparison with other types fuel can be fully used, since it is easy to organize complete combustion with minimal heat loss. It is worth noting that natural gas does not contain ballast and harmful impurities, it also has a high calorific value and high temperatures develop during combustion. All high-temperature installations have the main task ensuring the continuity the process with minimal fuel consumption, using energy from both primary and secondary energy resources (SER). Under pyrolysis conditions, methane is most thermally stable, since thermal degradation methane is thermodynamically possible at temperatures above 560°C. However, when methane reaches significant speeds, it decomposes at temperatures about 900°C, and at temperatures above 1400°C it completely decomposes into carbon and hydrogen. The purpose calculations the mathematical model is to determine the heat transfer coefficient and the temperature field methane heating inside a single tube under specified boundary conditions and thermal parameter the system under consideration. Solving this problem will increase the energy efficiency the high-temperature process. Also, the input the calculations was the analysis of existing apparatus for the pyrolysis methane with liquid coolant for steelmaking, is determined depending on the heat transfer regime gas flow (Re⩽105), the number Nusselt, the amount heat received and given in the decomposition process, the temperature heating natural gas and represented by a graph fraction carbon and hydrogen inlet the thermal decomposition in terms the cooling high-temperature facilities.

The article presents the results of an experimental study of the non-stationary process of contact heat transfer between hot coke and siderite ore. To conduct this study, an experimental installation of a cylindrical shape was built. As process of the material used siderite ore (FeMgCO3) sfericheskoi shape with a diameter of 20 mm. Based on the accepted diameters of siderite ore and coking coal was considered a uniform distribution of process material in the layer of coke, based on the determined quantitative ratio of 1:17. Heat exchange is carried out due to the temperature difference only between the hot spherical pieces of coke and cold spherical piece of ore. High-temperature experimental study of the contact heat transfer process allowed to determine such parameters as: the total heat transfer time, the cooling time of coke, the heating time of siderite ore in the coke layer of spherical shapes, the average mass temperature of coke cooling and heating of siderite ore.