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The Effect of Screw Design on Solid Behaviors and the Interaction between Solid and Screws in COREX Shaft Furnace
Author(s) -
Qiu Zi Long,
Luo Zhi Guo,
Wang Feng,
Nie Hai Qi,
Chen Ren,
Zou Zong Shu
Publication year - 2017
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.201600259
Subject(s) - abrasive , materials science , volume (thermodynamics) , screw pump , finite element method , flow (mathematics) , mechanical engineering , screw thread , composite material , structural engineering , engineering , mathematics , geometry , physics , quantum mechanics
COREX shaft furnace (SF) is a typical screw hopper with eight screws evenly distributed at bottom. The design of screws plays an important role in moving behaviors of burdens and interaction between solid. Therefore, a three‐dimensional cylindrical COREX SF model at full scale of Baosteel is established based on the Discrete Element Method to study the influences of the design of screws, and comparisons are made between the old and modified screws of Baosteel. The measure implemented to the modified screw is to decrease screw flight diameters from the pitch 1 to 3 to obtain greater increment withdraw volume along the screw length. The results show that the profile coefficient, increases dramatically at pitch 4 and 5 than that of the old screw. Compared to old screw, descending velocities and flow patterns of modified screw are more uniform in the lower part of SF. The force distributions are similar in the upper part of SF between the two screws, but the small force area in the lower part for the modified screw expands from screw tip to furnace wall, which is much bigger than that of old screw. The abrasive screw wear at the third and fourth pitches are alleviated with the implement of the modified screw, which is consistent with the force distribution in the lower part of SF. Additionally, the total power draw also decreases after the modification. The findings of this work should be useful for the design, control, and optimization of the SF operation.