Gas blow mode of blowing period of blast furnaces

The purpose of the work is to generalize the experience of varying the gas-blowing parameters in the blowing periods of blast furnaces and to develop recommendations for further improvement of the gas-dynamic blowing mode. The data on the change in the gas and dust regime of the blasting periods of blast furnaces of different volumes under different raw material and operating conditions have been systematized. It was established that at a lower rate of growth of the blowing flow in the blowing period, a higher blowing temperature in it contributes to the complication of the gas dynamics of the blast furnace process, which is evidenced by the simultaneous increase in the blowing pressure, pressure drop, and gas pressure on the furnace, as a compensator of these complications. Offered within the limits of the daily blowing period with output to the final blowing consumption of up to 1.0 Vd/Vcor·min in the second half-period of blowing, increase the number of one-time blowing additives with a decrease in their size to the limits of real use. It is justified to give preference to increasing the blowing flow before increasing its temperature in the blowing period, since both parameters have a competitive effect on the gas dynamics of the blast furnace process with significantly different effects on the structuring of the charge column. It has been proven that the common recommendation to blow the furnace on all nozzles of the working diameter does not correspond to the technology of conducting the blowing period, taking into account the low total initial cost of blowing to create active nozzle foci. Inclusion of the proposed recommendations in the practice of starting blast furnaces will make it possible to reach the planned parameters of the gas dynamic regime in a short period of the blowing period.