Decarburization Reactions of CO₂–O₂ Mixed Gas in the Impact Zone of the Cavity for Converter by Dual Isotope Tracing Method

Abstract

To develop CO 2 utilization technology in converter process, it is necessary to study the chemical reactions of the CO 2 -O 2 mixed gas in the cavity. 13 CO 2 -18 O 2 dual isotope gas was used to distinguish the complex reactions and analyzed the effect of injection height. The results show that as the injection height increased from 10 to 30 mm, the influence of CO 2 participating in the reaction is relatively unobvious; regarding O 2 , the flowrate of uninvolved reaction increases; the flowrate of post combustion increases first and then decreases; the flowrate of O 2 directly involved in decarburization is basically stable in the range of 20-30 mm after decreasing. Maintaining the injection height of 20 mm, the O 2 flowrates of post combustion in the ranges of 0-5 mm, 5-10 mm, and 10-15 mm are 4.95 mL•min − 1 , 13.85 mL•min − 1 and 6.73 mL•min − 1 , respectively. It can reduce the waste of mixed gas due to post combustion and improve the quality of furnace gas if the injection height is not in the range of high post combustion ratio. KEY WORDS: CO 2 -O 2 mixed gas; injection height; isotope tracing method; post combustion; decarburization. Fig. 1. Experimental devices. (a) Experiments on the effect of injection height change (b) Gas composition change experiment at different collection height.