Premium
Thermodynamic Discussion of CO 2 Injection in Molten Steel
Author(s) -
You Xinchen,
He Shengping,
Zhang Min,
Zeng Jianhua,
Li Long,
Wang Qian,
Wang Qiangqiang,
Li Yugang
Publication year - 2020
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201900450
Subject(s) - decarburization , metallurgy , partial pressure , materials science , oxygen , volume fraction , volume (thermodynamics) , carbon fibers , thermodynamics , chemistry , composite material , physics , organic chemistry , composite number
CO 2 utilization in the steel industry is indispensable to energy saving and emission reduction. Blowing CO 2 into a basic oxygen furnace assists decarburization. Thermodynamics of the decarburization reaction while injecting CO 2 into molten steel and the effects of the mixed‐gas ratio, initial carbon content of the molten steel, and system pressure on decarburization and temperature change are discussed. The final carbon content of the molten steel increases and its temperature decreases with the increased volume fraction of CO 2 . Under normal atmospheric pressure, the decarburization reaction gradually stagnates. As the system pressure decreases, decarburization is more efficient and a lower gas mass is required. Compared with O 2 blowing, CO 2 mixed‐gas blowing under a pressure of 10.1325 kPa results in a lower oxygen content in the molten steel of 0.028% and decarburization of 0.0065% is also achieved. An excessively high volume fraction of CO 2 , however, greatly reduces the bath temperature.