Koyfman O. Improvement of the efficiency of hot-blast stoves by increasing the pressure of exchange gas

The subject of research: the processes of heat exchange in the checker and the working modes of hot blast stoves. Purpose of research: the impact of the exchange gas pressure increase while heating of the checker on the heat exchange process in the hot blast stoves. Methods of research: methods of planning of experiments; the experimental setup for the study of heat exchange in the checker under pressure; computational methods of heat exchange process; methods of mathematical statistics; methods of similarity theory; mathematical modeling of heat exchange between the exchange gas and the checker considering the pressure of the exchange gas using Borland C ++ Builder. For the first time on an experimental setup, the impact of the pressure of the exchange gas on the heating of the checker was defined, and the increase of the value of the heat exchange coefficient from 135 to 308 W/m2K at the increase of the overpressure from 10 to 240 kPa was determined. For the first time a mathematical model of heating and cooling of the checker of the hot blast stove was developed and implemented, it is based on the numerical solution of the problem of heat transfer in the fixed bed, and allows to evaluate the heat exchange in the checker at different values of the overpressure of the exchange gas. The possibility of the increase of the exchange gas in the hot blast stove was confirmed, it allows without significant investments to increase the temperature of the blast furnace blast and (or) to put out of service one hot blast stove out of the block. For the first time there were proposed the structure and the working modes of hot blast stove which allow to use the blast furnace gas and air for the heating with overpressures of more than 120 kPa during the heating of the checker (Pat. No. 88584).