ZHANG Jian-liang
,
CHEN Yong-xing
,
FAN Zheng-yun
,
HU Zheng-wen
,
YANG Tian-jun
,
Tatsuro Ariyama
钢铁研究学报(英文版)
The objective of the present investigation is to analyze the influence of profile of blast furnace on the burden motion and stress field through 3D-DEM (three-dimensional discrete element method). It is clarified that the decrease of shaft angle speeds up the velocity of burden descending and decreases normal stress between particles or particle and wall. This change is good for the smooth operation of blast furnace. However, ore and coke would be mixed for the too small shaft angle (75°), which would influence the permeability in blast furnace. Thus, the appropriate shaft angle is around 80°. Decrease of bosh angle prevents the burden descending motion and increases normal stress between particles and bosh wall. Meanwhile, maximum normal stress acting on the wall moves from belly wall to bosh wall in the case of 68° bosh angle, which accelerates abrasion of refractory in bosh by friction force between particles and wall. Although burden descends smoothly in the case of 88° bosh angle, room is not enough for the ascending heated gas flow. Thus, the appropriate bosh angle is about 78°.
关键词:
blast furnace
,
profile
,
solid motion
,
stress
,
discrete element method
ZHANG Xu
,
ZHANG Jian-liang
,
HU Zheng-wen
,
et al
钢铁研究学报(英文版)
On the premise of maintaining the reducibility of sinter unchanged, it is of great significance to reduce the RDI of sinter, which will improve the permeability of blast furnace burden column, so as to realize stable and smooth performance, and keep high yield and low consumption. Under laboratory conditions, a study was proposed on the RDI and RI of sinter, which was immersed with different types and concentrations of solutions. The results show that Cl- is the main factor for reducing the RDI of sinter, and the RDI and RI of sinter decrease with the increase of Cl- concentration. With comprehensive consideration of the RDI and RI of sinter, when the concentration of Cl- is 2%, the RDI of sinter will be significantly reduced and RI will not be affected. In order to study the mechanism of CaCl2 effect on the RDI and RI of sinter, analysis based on the methods of IR Spectra, SEM and chalcography was adopted.
关键词:
sinter;CaCl2;RDI (Reduction Degradation Index);RI(Reduction Index)
