38
D. Li et al.
Disturbance Analysis of Gas Jet on Equipment in Furnace
Operation
From the above analysis, it can be concluded that the oscillation of melt and gas jets
will occur after a period of operation, which will cause the oscillation of the molten
bath. The oscillation of the molten bath has adverse effects on the smooth operation
of the furnace and the life of the furnace. Therefore, according to the magnitude
and variation of disturbance force in each direction of the molten bath in 65 s, the
calculation knot can be obtained. As a result, further analysis of the variation of
disturbance force in different directions of the furnace body will play a certain role
in adjusting the position of oxygen lance nozzle and the size of gas injection to ensure
the stability of the molten bath.
From Fig. 3, it can be found that the variation of X-direction, i.e. the longitudinal
disturbance force of the furnace body, is relatively stable (0–6000 N), but the frequency increases gradually. Therefore, it is considered that the swing amplitude of
gas jet in the axial direction of the furnace body is relatively stable, but the swing frequency is gradually accelerated. From Fig. 4, it can be seen that the Y-direction of the
furnace body, i.e. the transverse disturbance, presents a relatively obvious increase
process (0–150,000 N), but the frequency of change is relatively stable, and there are
about four change periods in 10 s. Through the above analysis, it can be concluded
that the oscillation of molten bath is directly related to the disturbance force of gas jet
in all directions of the furnace body. The gas jet will oscillate in the molten bath, and
the size changes regularly. The oscillation frequency along the longitudinal direction
accelerates, and the disturbance force along the transverse direction increases gradually. Therefore, adjusting the distribution density and quantity of oxygen lance in
the axial direction can play an intuitive role in reducing the oscillation of the molten
bath.
Fig. 3 X-directional/longitudinal disturbance analysis of furnace body
D. Li et al.
Disturbance Analysis of Gas Jet on Equipment in Furnace
Operation
From the above analysis, it can be concluded that the oscillation of melt and gas jets
will occur after a period of operation, which will cause the oscillation of the molten
bath. The oscillation of the molten bath has adverse effects on the smooth operation
of the furnace and the life of the furnace. Therefore, according to the magnitude
and variation of disturbance force in each direction of the molten bath in 65 s, the
calculation knot can be obtained. As a result, further analysis of the variation of
disturbance force in different directions of the furnace body will play a certain role
in adjusting the position of oxygen lance nozzle and the size of gas injection to ensure
the stability of the molten bath.
From Fig. 3, it can be found that the variation of X-direction, i.e. the longitudinal
disturbance force of the furnace body, is relatively stable (0–6000 N), but the frequency increases gradually. Therefore, it is considered that the swing amplitude of
gas jet in the axial direction of the furnace body is relatively stable, but the swing frequency is gradually accelerated. From Fig. 4, it can be seen that the Y-direction of the
furnace body, i.e. the transverse disturbance, presents a relatively obvious increase
process (0–150,000 N), but the frequency of change is relatively stable, and there are
about four change periods in 10 s. Through the above analysis, it can be concluded
that the oscillation of molten bath is directly related to the disturbance force of gas jet
in all directions of the furnace body. The gas jet will oscillate in the molten bath, and
the size changes regularly. The oscillation frequency along the longitudinal direction
accelerates, and the disturbance force along the transverse direction increases gradually. Therefore, adjusting the distribution density and quantity of oxygen lance in
the axial direction can play an intuitive role in reducing the oscillation of the molten
bath.
Fig. 3 X-directional/longitudinal disturbance analysis of furnace body