Semakov V. Increase of efficiency of reducing work of the gas flow by means of formation of a rational structure of the charge column in blast furnaces

The object - reduction processes in blast furnace. The subject - alternations of the indices of blast-furnace heat, resulted from improvement of the degree of application of reducing capability of the gas flow, the shape of the column of charging materials and their properties. Research methods: laboratory investigations, methods of physical simulation, mathematical statistics, active and passive experiments. The thesis was revealed that the criterion of complete course of indirect reduction allowed objective evaluating of its reserve as well as correct evaluating of furnaces functioning under conditions of different process modes. The graphical and analytical diagram of blast process was modified. Proposed was the comparison of economic outcome of reduction processes of blast furnace melt according to specific consumption of the reducer gas per unit of atomic oxygen of iron monoxide, while reducibility of sintered ore and pellets – compared by the degree of reduction with regard to Fe (II). It was found out by investigation of gas permeability of the of iron ore charge alongside with the analysis of the shape of the pellets surface layer that increase of their content by 70 % and position of the inter-layer area in the peripheral layer could promote development of the peripheral gas flow. The character of distribution of ore loads along the furnace’s radius per charging cycles, ensuring formation of high layers of uniform materials from 4 skips was analyzed at their different distribution. A method of furnace charging by means of bell-free charging device was developed.