QU Tian-peng
,
LIU Cheng-jun
,
JIANG Mao-fa
钢铁研究学报(英文版)
The fluid flow in tundish is a non-isothermal process and the temperature variation of stream from teeming ladle dominates the fluid flow and thermal distribution in tundish. A numerical model was established to investigate the effect of inlet cooling rate on fluid flow and temperature distribution in tundish based on a FTSC (Flexible Thin Slab Casting) tundish. The inlet cooling rate varies from 0.5 to 0.25 ℃/min. Under the present calculation conditions, the following conclusions were made. When the stream temperature from teeming ladle drops seriously (for inlet cooling rate of 0.5 ℃/min), there is a “backward flow” at the coming end of casting. The horizontal flow along the free surface turns to flow along the bottom of tundish. The bottom flow shortens the fluid flow route in tundish and deteriorates the removal effect of nonmetallic inclusions from molten steel. Nevertheless, when the inlet cooling rate decreases to 0.25 ℃/min, the horizontal flow is sustained during the whole casting period. The present research provides theoretical directions for temperature control in teeming ladle and continuous casting tundish during production of advanced steels.
关键词:
tundish
,
thermal distribution
,
unsteady
,
numerical simulation
HE Chun-lai
,
ZHU Rong
,
DONG Kai
,
QIU Yong-quan
,
SUN Kai-ming
钢铁研究学报(英文版)
A transient three-dimensional mathematical model has been developed to analyze the three-phase flow in a 150 t EAF (electric arc furnace) using oxygen. VOF (multiphase volume of fluid) method is used to simulate the behaviors of molten steel and slag. Numerical simulation was conducted to clarify the transient phenomena of oxygen impingement on molten bath. When oxygen jet impinges on the surface of molten bath, the slag layer is broken and the penetrated cavity in molten steel is created. Simultaneously, the wave is formed at the surface of uncovered steel on which the slag layer is pushed away by jet. The result of numerical simulations shows that the area and velocity of uncovered steel created by impingement, jet penetration depth change from 0.10 m2, 0.0125 m/s, 3.58 cm to 0.72 m2, 0.1445 m/s, 11.21 cm, when the flow rate of an oxygen lance varies from 500 to 2000 m3/h. The results have been validated against water model experiments. More specially, the relation between the penetration depth and oxygen flow rate predicted by numerical simulation has been found to agree well with that concluded by water model.
关键词:
electric arc furnace
,
three-phase flow
,
numerical simulation
唐德池，冯捷，李永林，朱立新
钢铁
运用fluent 6.3对板坯连铸结晶器进行数值计算，研究结晶器宽度对流场的影响。结果表明：对于230mm厚结晶器，随结晶器宽度增加，其液面的最大水平流速减小，但减小的幅度趋缓，液面最大垂直速度和冲击点处速度逐渐减小；宽度分别为1400、1600和2150mm时，液面水平流速达到最大时分别为距离窄边460、540和750m处，冲击点位置分别距离液面0.37、0.40和0.46m，冲击点的速度分别为5.2、4.4和2.5cm/s。
关键词:
结晶器
,
flow field
,
numerical simulation
