WANG Ming-lin
,
L Ying-hua
,
YANG Wen-yuan
,
LI Shu-gui
,
XU Xiao-wei
钢铁研究学报(英文版)
Based on the on-site investigation and the principle of compressible flow, the working oxygen pressure should be matched to the Mach-number at the nozzle in designing nozzle and oxygen supply schedule so that the higher penetration depth and the more blending energy can be obtained for reducing energy loss by shock wave in the ultrasonic oxygen jet in the normal BOF steelmaking. For some special BOF blowing technologies, such as steelmaking with high phosphorus hot metal, post combustion oxygen lance, hot metal pretreatment, etc, the difference between working oxygen pressure and designed diffusion pressure which is related to Mach-number is necessary, so that the velocity of the oxygen jet will be decreased because of shock wave for expected metallurgical results.
关键词:
oxygen pressure
,
Mach-number
,
steelmaking
,
penetration depth
F Farshidfar
,
M Ghassemi Kakroudi
钢铁研究学报(英文版)
Free opening rate is mainly determined by the performance of the ladle filler sand. High free opening rates of ladles are required in steel making to improve steel quality. Chromite ladle filler sands are one of the most widely used ladle filler sand. Several operative variables and materials characteristics affect the performance of the sands. Three sets of chromite ladle filler sands were selected and researches were focused on the sintering behaviour and performance of the sands under operative conditions. The effect of particle size distribution on sintering, microstructure, flowability, and permeability were presented. In all cases, the particle size varies from 01 to 15 mm corresponding to free flowing powders. One of the samples has higher permeability factor in comparison with others due to low particle size distribution. The other sample presents very good free opening due to its very good flowability and permeability factor.
关键词:
nozzle filler sand
,
chromite based sand
,
sintering behavior
,
penetration depth
