Abstract: In order to make the converter vaporizing flue blowing pulverized coal process applied to iron and steel production with low cost and high applicability, and to achieve the purpose of carbon reduction, it is necessary to study the reaction characteristics of pulverized coal gasification-conversion reaction with CO₂ in high temperature flue gas of converter as well as to conduct the exergy. The reaction characteristics of pulverized C-CO₂ under different atmospheric and temperature conditions were investigated by settling furnace experiments, and industrial tests were carried out in a 120 t converter wet flue gas system, the change in exergy loss and exergy efficiency was calculated during the test.The results of the settling furnace experiments showed that the higher the reaction temperature was, the more favorable the reaction of pulverized C-CO₂ was, and it reached the maximum at 1 350 ℃; with the increase of CO₂∶CO ratio in the atmosphere, the conversion of CO₂ in the flue gas showed an increasing trend.The results of the industrial experiments showed that, in the case of pulverized coal blowing amount of 3.76 kg/t, the average volume fraction of CO in the converter gas increased by 5.53 percentage points, the average volume fraction of CO₂ decreased by 3.83 percentage points, and the value of the recovered gas increased by 2 690.95 kJ/m³.And with the increase of coal injection, the exergy efficiency increased by 89.06% which showed that it was feasible to convert CO₂ into CO by blowing pulverized coal in the converter vaporizing flue, and the pulverized coal-CO₂ gasification reaction was well.

Key words: converter, CO₂ conversion, wet dedusting in converter, exergy loss, exergy efficiency