TY - JOUR
T1 - Numerical investigation of burden distribution in hydrogen blast furnace
AU - Li, Jing
AU - Kuang, Shibo
AU - Zou, Ruiping
AU - Yu, Aibing
N1 - Funding Information:
The authors are grateful to the Australian Research Council (ARC) and the Natural Science Foundation of China (NSFC) (5203000616) for the financial support of this work, the National Computational Infrastructure (NCI) for the use of high-performance computational facilities, and CAFFA3D for making a useful code available for free use and adaptation.
Publisher Copyright:
© 2022, The Author(s).
PY - 2022/12
Y1 - 2022/12
N2 - Hydrogen injection is a promising technology currently under development to reduce CO2 emissions in ironmaking blast furnaces (BFs). Therefore, hydrogen BF is studied by a recent process model based on computational fluid dynamics (CFD). It focuses on the effect of peripheral opening extent (POE), which represents the coke amount near the furnace wall. The simulations consider a 380 m3 BF operated with hydrogen injection through both shaft and hearth tuyeres. The overall performance of the BF is analyzed in terms of the inner states. It shows that increasing POE hinders the pre-reduction and pre-heating roles of shaft-injected hydrogen (SIH) but improves the CO indirect reduction rate. An optimum peripheral opening extent can be identified to achieve a maximum hot metal (HM) temperature, relatively low bed pressure, and good gas utilization. The interaction between SIH flow rate and burden distribution is also quantified. It shows that the increase in SIH flow rate slows down the CO indirect reduction rate but enhances the H2 indirect reduction rate. These opposite trends account for the less variation of HM temperature with POE as the SIH flow rate increases. This variation becomes trivial at relatively large SIH flow rates and small POEs. Overall, the POE affects the cohesive zones more than the SIH flow rate. However, under the conditions considered, both variables cannot significantly improve the penetration of the shaft injection, the effect of which is generally confined within the peripheral region.
AB - Hydrogen injection is a promising technology currently under development to reduce CO2 emissions in ironmaking blast furnaces (BFs). Therefore, hydrogen BF is studied by a recent process model based on computational fluid dynamics (CFD). It focuses on the effect of peripheral opening extent (POE), which represents the coke amount near the furnace wall. The simulations consider a 380 m3 BF operated with hydrogen injection through both shaft and hearth tuyeres. The overall performance of the BF is analyzed in terms of the inner states. It shows that increasing POE hinders the pre-reduction and pre-heating roles of shaft-injected hydrogen (SIH) but improves the CO indirect reduction rate. An optimum peripheral opening extent can be identified to achieve a maximum hot metal (HM) temperature, relatively low bed pressure, and good gas utilization. The interaction between SIH flow rate and burden distribution is also quantified. It shows that the increase in SIH flow rate slows down the CO indirect reduction rate but enhances the H2 indirect reduction rate. These opposite trends account for the less variation of HM temperature with POE as the SIH flow rate increases. This variation becomes trivial at relatively large SIH flow rates and small POEs. Overall, the POE affects the cohesive zones more than the SIH flow rate. However, under the conditions considered, both variables cannot significantly improve the penetration of the shaft injection, the effect of which is generally confined within the peripheral region.
UR - https://www.scopus.com/pages/publications/85140217157
U2 - 10.1007/s11663-022-02672-6
DO - 10.1007/s11663-022-02672-6
M3 - Article
AN - SCOPUS:85140217157
SN - 1073-5615
VL - 53B
SP - 4124
EP - 4137
JO - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
JF - Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
ER -