ISSN 2594-357X
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Abstract
Pre-reduction shaft furnace in Corex process uses screws to discharge burdens into the melter gasifier. However, the uneven screw discharging method in circumferential direction leads to the burden velocity segregation behaviors, which results in the redistribution of burden particles, thus directly affecting the gas distribution inside prereduction shaft furnace. Based on DEM, a three dimensional model is established in present work to investigate the particle size segregation behaviors (PSSB) during screw discharging process, which has been little studied before. The DEM base model is adapted to determine the effects of pre-reduction shaft furnace bottom diameter, screw casing diameter as well as screw rotating rate on burden descending velocity and PSSB. The pre-reduction shaft furnace bottom diameter influences the burden velocities most in edge area while almost makes no difference on the central area. To increase the screw casing diameter or the screw rotating speed increase the burden velocities in all areas and the increment is biggest for the edge area in the case of screw casing diameter while it almost keeps the same amplitude for all areas in the case of screw rotating diameter. To increase the furnace bottom diameter and to enlarge the screw casing diameter, or to decrease the screw rotating speed help to obtain a relatively uniform RPS distribution during discharging.
Pre-reduction shaft furnace in Corex process uses screws to discharge burdens into the melter gasifier. However, the uneven screw discharging method in circumferential direction leads to the burden velocity segregation behaviors, which results in the redistribution of burden particles, thus directly affecting the gas distribution inside prereduction shaft furnace. Based on DEM, a three dimensional model is established in present work to investigate the particle size segregation behaviors (PSSB) during screw discharging process, which has been little studied before. The DEM base model is adapted to determine the effects of pre-reduction shaft furnace bottom diameter, screw casing diameter as well as screw rotating rate on burden descending velocity and PSSB. The pre-reduction shaft furnace bottom diameter influences the burden velocities most in edge area while almost makes no difference on the central area. To increase the screw casing diameter or the screw rotating speed increase the burden velocities in all areas and the increment is biggest for the edge area in the case of screw casing diameter while it almost keeps the same amplitude for all areas in the case of screw rotating diameter. To increase the furnace bottom diameter and to enlarge the screw casing diameter, or to decrease the screw rotating speed help to obtain a relatively uniform RPS distribution during discharging.
Keywords
Pre-reduction shaft furnace in Corex; Screw discharging; Particle size segregation; DEM simulation.
Pre-reduction shaft furnace in Corex; Screw discharging; Particle size segregation; DEM simulation.
How to refer
Mingyin, Kou;
Shengli, Wu;
Jian, Xu;
Xinying, Guo;
Kaiping, Du;
Jing., Sun.
DEM SIMULATION OF PARTICLE SIZE SEGREGATION
BEHAVIORS DURING SCREW DISCHARGING
INSIDE THE COREX PRE-REDUCTION SHAFT FURNACE
,
p. 403-413.
In: 42º Seminário de Redução de Minério de Ferro e Matérias-primas / 13º Seminário Brasileiro de Minério de Ferro / 6th International Congress on the Science and Technology of Ironmaking,
Rio de Jabeiro,
2012.
ISSN: 2594-357X
, DOI 10.5151/2594-357X-22109
