474
K. Tang et al.
pool which at the bottom of the furnace. The recirculation will be formed when the
recirculated air contacts with the wall surface. The mainstream of the airflow will
exit from the vertical flue tunnel.
Temperature Field
Figure 5 shows the temperature distribution of the cross-sections. It can be seen
that the temperature distribution under each nozzle is basically similar, and the high
temperature region in the furnace first opens in a trumpet shape. At a position of
about 6 m from the top of the shaft, the radius of the high temperature region is
reduced because of the recirculation causes the high temperature zone to gather in
the middle; the industrial temperature at room temperature will rapidly heat up from
the nozzle into the reaction tower, reaching a maximum temperature of about 2000 K
from about 1.5 m from the top of the tower and within 1–2 m from the top of the
tower. For the high temperature region, the exothermic reaction in this region is very
intense; as the mass fraction of sulfide particles in the concentrate decreases and
the oxygen concentration decreases, the oxidation reaction rate slows down, and the
temperature below 2 m from the top of the tower decreases slowly.
Species Distribution
Figure 6 shows the SO 2 concentration distribution. Figures 3, 4, 5, and 6 show the
distribution of sulfur dioxide in the X 1 and Y 1 sections. It can be found that the
concentration of SO 2 is higher in 2.5 m below the nozzle because the desulfurization
reaction is very intense in this area, and a large amount of SO 2 is released. The region
with the most intense lead oxidation reaction; the concentration of SO 2 in the shaft
is basically stable from about 2.5 m below the top of the furnace surface, and the
desulfurization reaction has been basically completed.
Figure 5 shows the O 2 concentration contour on the X 1 and Y 1 cross-sections. It
can be observed that the industrial oxygen enters the reaction tower and exchanges
energy momentum with the charge particles. The oxidation reaction occurs, so that
the O 2 concentration decreases rapidly near the nozzle. The average O 2 mass fraction
is less than 0.07, indicating that the gas-particle mixture in the furnace is better, and
O 2 is fully utilized.
Single Nozzle Simulation
Base on the numerical model of the baseline case. This study changes the four nozzle
design and does the single central nozzle simulation as it is shown in Fig. 7. The
K. Tang et al.
pool which at the bottom of the furnace. The recirculation will be formed when the
recirculated air contacts with the wall surface. The mainstream of the airflow will
exit from the vertical flue tunnel.
Temperature Field
Figure 5 shows the temperature distribution of the cross-sections. It can be seen
that the temperature distribution under each nozzle is basically similar, and the high
temperature region in the furnace first opens in a trumpet shape. At a position of
about 6 m from the top of the shaft, the radius of the high temperature region is
reduced because of the recirculation causes the high temperature zone to gather in
the middle; the industrial temperature at room temperature will rapidly heat up from
the nozzle into the reaction tower, reaching a maximum temperature of about 2000 K
from about 1.5 m from the top of the tower and within 1–2 m from the top of the
tower. For the high temperature region, the exothermic reaction in this region is very
intense; as the mass fraction of sulfide particles in the concentrate decreases and
the oxygen concentration decreases, the oxidation reaction rate slows down, and the
temperature below 2 m from the top of the tower decreases slowly.
Species Distribution
Figure 6 shows the SO 2 concentration distribution. Figures 3, 4, 5, and 6 show the
distribution of sulfur dioxide in the X 1 and Y 1 sections. It can be found that the
concentration of SO 2 is higher in 2.5 m below the nozzle because the desulfurization
reaction is very intense in this area, and a large amount of SO 2 is released. The region
with the most intense lead oxidation reaction; the concentration of SO 2 in the shaft
is basically stable from about 2.5 m below the top of the furnace surface, and the
desulfurization reaction has been basically completed.
Figure 5 shows the O 2 concentration contour on the X 1 and Y 1 cross-sections. It
can be observed that the industrial oxygen enters the reaction tower and exchanges
energy momentum with the charge particles. The oxidation reaction occurs, so that
the O 2 concentration decreases rapidly near the nozzle. The average O 2 mass fraction
is less than 0.07, indicating that the gas-particle mixture in the furnace is better, and
O 2 is fully utilized.
Single Nozzle Simulation
Base on the numerical model of the baseline case. This study changes the four nozzle
design and does the single central nozzle simulation as it is shown in Fig. 7. The