Equipment for blowing oxygen from blast furnace tuyere and blast furnace operating method

摘要

In equipment that blows pulverized coal and oxygen from the blast furnace tuyeres into the blast furnace through the lance, gas inside the blast furnace is mixed into the oxygen piping connected to the lance, or gas inside the blast furnace and oxygen is mixed into the nitrogen piping. To prevent. The oxygen blowing equipment 100 includes a lance 4, an oxygen pipe 7 provided with an oxygen cutoff valve 22, a flow rate adjusting valve 21, a nitrogen pipe 8 provided with a nitrogen cutoff valve 28, an oxygen cutoff valve 22 and a nitrogen cutoff. And a control device 30 that performs opening / closing control of the valve 28. The oxygen pipe 7 is connected to the lance 4 and supplies oxygen 40 to the lance 4. The nitrogen pipe 8 is connected to the oxygen pipe 7 upstream from the oxygen flow rate adjustment valve 21 in the oxygen flow. The oxygen cutoff valve 22 is provided in the oxygen pipe 7 upstream of the connection position between the oxygen pipe 7 and the nitrogen pipe 8 in the oxygen flow. The control device 30 closes the nitrogen cutoff valve 28 when the oxygen cutoff valve 22 is open, and opens the nitrogen cutoff valve 28 when the oxygen cutoff valve 22 is closed.