JPS6055562B2 - Blast furnace air tuyere - Google Patents

Description

[Detailed description of the invention] The present invention relates to blast furnace ventilation panels.

In general, damage to the blast furnace air siding often occurs at the tip of the tuyere, especially at the front of the tuyere tip.

Conventionally, attempts have been made to improve the lifespan of the blast furnace panels by changing the arrangement of the partition walls and guide walls of the blast furnace ventilation panels, or by increasing the amount of cooling water supplied.

However, in the conventional method described above, the internal structure of the blast furnace air lining becomes complicated, leading to an increase in pressure loss, that is, an increase in water supply pressure, and in addition to increasing costs, there are problems with the pressure resistance of the lining. There are also problems such as the need to change the water supply equipment. Furthermore, if the front part of the tip of the blast furnace air tuyere is damaged, it is impossible to pass or cut off the cooling water to that part, so it is necessary to cut off the passage of cooling water to the entire part of the tip of the tuyere. At this time, water is only passing through the body of the blast furnace ventilation panel, so the panel cannot be used continuously in this state, and the panel must be replaced immediately, which causes the following problems. It happens.

(1) Sudden wind breaks or wind reductions are forced,
This not only causes a decrease in productivity, but also makes the furnace condition unstable, which is a major factor in reducing the life of the blast furnace.

(2) Replacement of the paneling must be carried out regardless of time, which deteriorates the working environment and efficiency.

The present invention solves the various problems of the conventional blast furnace ventilation panels described above, and provides a blast furnace ventilation panel that can sufficiently cope with breakage of the tip of the panel, does not reduce productivity, and prevents a reduction in the life of the blast furnace. It is something to do.

The features of the blast furnace air blower according to the present invention include: a body cooling chamber with a body water supply and drainage pipe connected to the body, and a tuyere tip water supply and drainage pipe connected via a breakage detector and a control mechanism. The front cooling chamber for the tip and the rear cooling chamber for the tip are provided independently and separately.

In the blast furnace blowing panel according to the present invention, the interior of the tuyere main body 1 is divided into a trunk cooling chamber 2 by partition walls 5 and 6, a tip front cooling chamber 3 and a tip rear cooling chamber separated by a guide wall 7. 4 are provided independently and separately, and the tuyere body 1
The trunk cooling chamber 2 is connected to the trunk water supply and drainage pipes 21 and 24 via cutoff valves 14 and 13, and the tuyere tip water supply and drainage pipes 15 and 25 are connected to the damage detector 8 from three sides. It is connected to the front tip cooling chamber 3 and the tip rear cooling chamber 4 via a control mechanism of switching valves 9 and 10.

Therefore, for example, if either the front tip cooling chamber 3 or the tip rear cooling chamber 4 is damaged, either the three-way switching valve 9 or 10 will be activated in response to a command from the damage detector 8. switching,
At the same time, one of the shutoff valves 11 and 12 is stopped to cut off the water supply to either the tip front cooling chamber 3 or the tip rear cooling chamber 4, and the water supply to either of these cooling chambers and the body cooling chamber 2 is interrupted. This allows continuous use of the blast furnace air tuyere by cooling the blast furnace with water.

Next, the blast furnace tuyere according to the present invention will be explained in more detail.

That is, in FIGS. 1 and 2, the blast furnace air tuyeres include tuyere tip supply and drainage pipes 15 and 21 with a pressure of 20k91c1i for the tuyere tip cooling chamber, and tuyere tip pipes 15 and 21 with a pressure of 10k91c1i for the tuyere body cooling chamber.
k91c71! Tuyere body supply and drainage pipes 21 and 24, and the normal water supply and drainage route is that the cooling water goes to the body cooling chamber 2 from piping 21 → shutoff valve 14 → piping 22 → body cooling chamber 2 → piping. The water flows in the order of 23→shutoff valve 13→piping 24 and is drained.
In addition, in the tip cooling chamber, the cooling water is connected to a breakage detector 8 - piping 1
5→3-way switching valve 9→Piping 16→Tip front cooling chamber 3→Piping 17→Shutoff valve 11 - Piping 18→Shutoff valve 12→Piping 19→
Tip rear cooling chamber 4 → Piping 20 - 3-way switching valve 10 - Piping 2
5 → Breakage detector 8 → Water is drained outside the tuyere.

Then, the front cooling chamber and the tip of the tuyere tip cooling chamber. A case where the end rear cooling chamber is damaged will be explained.

(1) If the cooling chamber in front of the tuyere tip is damaged. When the breakage detector 8 detects that the front cooling chamber 3 is damaged, the three-way switching valve 9 is switched and the shutoff valve 11 is closed. Switching valve 9→
Piping 18 → Shutoff valve 12 → Piping 19 → Tip rear cooling chamber 4 →
The water is drained through the pipe 20 → three-way switching valve 10 → pipe 25 → damage detector 8. (2) If the cooling chamber at the rear of the tuyere tip is damaged.

When the breakage detector 8 detects damage to the tip rear cooling chamber 4, the three-way switching valve 10 is switched and the shutoff valve 12 is closed. → 3-way switching valve 9 → piping 16 → tip front cooling chamber 3 → piping 17 → shutoff valve 11 - piping 18 → 3-way switching valve 10 → piping 25 → breakage detector 8 → discharged to the outside of the tuyere. In this way, even if either the front cooling chamber at the tuyere tip or the rear cooling chamber at the tuyere tip is damaged, the cooling water can be switched accordingly.
Cooling of the tuyere is continuous. As explained above, since the blast furnace air tuyere according to the present invention has the above configuration, the life of the tuyere can be extended, and the tuyere replacement work can be carried out in a planned manner. Since it can be carried out, it is possible to prevent a decrease in productivity due to sudden wind outages or reductions in wind, and a decrease in the life of the blast furnace due to unstable furnace conditions, and also to improve the environment and efficiency of tuyere replacement work. As blast furnace operations have recently become all-coke, the form of tuyere damage has changed from conventional damage due to hot metal attack to wear of the cooling chamber at the front of the tip, and the tuyere can continue to act on this damage as well. This effect is achieved.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a blast furnace blowing tuyere according to the present invention, and FIG. 2 is a partially cross-sectional explanatory view of the cooling water pipe and the tuyere. 1 - tuyere body, 2 - body cooling chamber, 3 - tip front cooling chamber,
4 - Tip rear cooling chamber, 5, 6 - Partition wall, 7 - Guide wall, 8
~ Breakage detector, 9, 10 ~ 3-way switching valve, 11, 12, 1
3, 14 ~ Shutoff valve, 15, 16, 17, 18, 19, 2
0, 21, 22, 23, 24, 25 ~ Piping.

Claims (1)

[Claims] 1 Inside the tuyere body, there is a body cooling chamber connected to the body water supply and drainage piping, a front tip cooling chamber connected to the tuyere tip water supply and drainage pipe via a breakage detector, and a control mechanism, and a tip rear cooling chamber. A blast furnace air tuyere characterized by having separate chambers.