Features of the definition of parameters of a block of hot blast stoves with heating of a checker under pressure

An issue of improvement of the effectiveness of the operation of a block of hot blast stoves of the blast furnace in order to rise the temperature of the blast-furnace air was considered. It was shown that an increase of the temperature of the blast-furnace air without the use of natural gas and oxygen for combustion is possible due to the changing of the operation modes of a block of hot blast stoves and at the increase of the pressure of the exchange gas. An analysis of the recent researches and publications describing the methods for determining the parameters of the operation of the block of hot blast stoves of the blast furnace was performed; their advantages and disadvantages were described. The goal of the research was set. A database of process parameters of the block was processed to determine the main characteristics of the operation of hot blast stoves of the blast furnace. Averaged values of the basic technical and design parameters were obtained; they characterize the operation of each hot blast stove of the block with the use of which the adjustment of a mathematical model of the operation of each of hot blast stove of the block was achieved. A method for determining the main unit operating parameters on the block on the account of the desired blast temperature was designed. The values of the duration of the cycle "heating + air blasting" depending on the set-point temperature of the smoke at various values of air blasting temperatures were determined for each hot blast stove of the block using a mathematical model. The authors suggested to use such dependencies to determine the temporal parameters of the operation of the block of hot blast stoves. The obtained values of the duration of heating periods and air blasting of each hot blast stove of the block should be corrected if the continuity of the air blast supply to the blast furnace is not ensured. The examples of the use of this technique were given and the obtained results were described. It is shown that an increase of the pressure in the operating space in the course of the heating period of the checker the temperature of the hot air blasting can be increased due to a larger amount of heat accumulated by the checker. As seen from the results of the research the set blast conditions of the blast furnace can be ensured with fewer hot blast stoves in the block due to the increase of the pressure