Petrik A. The improving of efficiency of heat use in the steelmaking unit by carbon monoxide post-combustion

Dissertation for the degree of candidate of technical sciences, specialty 05.14.06 - Technical thermal physics and industrial Heat of Power Engineering. - National Metallurgical Academy of Ukraine, Dnіprо, 2018. This work is devoted to the study of increasing the efficiency of heat use in the steelmaking unit by carbon monoxide post-combustion. It basis of the development of energy efficient thermal and oxygen modes. That allow reducing the consumption of natural gas. An innovative design of the blowing device with a combined arrangement of holes and nozzles was developed. The influence of the carbon content and the duration of the purge on the length and temperature of the flame of the flue gas from the purge zone was experimentally determined. The optimum geometric characteristics of the blowing device were determined by the criterion K (the ratio of the depth of the holes in the melt to the diameter of the reaction zone) and the intensity of mixing of the melt. A new energy-saving thermal and oxygen steelmaking regime was developed and introduced into industrial production, which provides for an increase in the efficiency of heat use in the afterburning of carbon oxides using a rational design of the lance in the steelmaking unit, which led to a decrease in the technological consumption of natural gas for steelmaking by 6.89 m3/t (from 6.89 to 0 m3/t), purging time for 0.2 h (from 3.71 to 3.51 h) and allowed the unit to switch to the process of steelmaking without the use of natural gas.