KR20030030263A - A cleaning device of melted iron path for furnace - Google Patents

Abstract

PURPOSE: A device for clearing molten iron path of blast furnace skimmer part is provided to remove silicon solidified on the lower part of skimmer for removing slag in main iron trough for flowing molten iron tapped from blast furnace. CONSTITUTION: The device for clearing molten iron path of blast furnace skimmer part comprises a lance(31) which is equipped with a nozzle(30) for ejecting oxygen at a high pressure from an oxygen tank, and the outer part of which is covered with a refractory material, wherein the nozzle(30) is longitudinally bent in a certain angle; a flexible hose for connecting the lance(31) to the oxygen tank; a cylinder(40) connected to the end part of the lance(31) to move the lance(31) vertically; and a support(50) which is supported to the upper surface of a dust collecting hood(20) covering main iron trough that is a path of molten iron, and which fixes the cylinder(40), wherein the dust collecting hood(20) comprises a gate(21) through which the lance(31) passes, and a cover(22) for opening or closing the gate(21), and wherein the device further comprises a gate opening and shutting cylinder(23) in which the end part of piston is hinge connected to the gate(21), and the end part of the cylinder(23) is hinge fixed to the upper surface of the dust collecting hood(20) so that the gate(21) is opened or closed by the gate opening and shutting cylinder(23).

Description

A cleaning device of melted iron path for furnace}

The present invention relates to a device for penetrating the molten iron flow path of the blast furnace, and more particularly to a device for removing the silicon solidified in the lower portion of the skimmer for removing slag in the molten iron flowing out of the blast furnace. will be.

As shown in FIG. 1, in general, the molten iron 12 melted in the blast furnace flows out to the large hot water path 10 through the exit port, and then falls into the raceway and is alternately loaded on two ladles. It is transferred to the steelmaking process. The dust collecting hood 20 is installed at the upper part of the large water supply passage 10 to block high heat and dust of the molten iron 12. At this time, slag existing in the molten iron 12 is removed by a skimmer 11, as shown in FIG.

That is, since the slag is floating on the upper portion of the molten iron 12, it is caught by the skimmer 11 and can no longer move forward, so that the slag floats through the bottom of the skimmer 11 and the bottom of the bath 10. ) Will flow out. The slag thus removed is taken out to the outside through an unshown outlet.

However, the molten iron 12 includes silicon (Si), and if the operation is continued for a long time, the silicon is accumulated on the bottom of the skimmer 11 or the bottom of the bath 10 to form a solidification layer. As a result, the space between the skimmer 11 and the bath 10 is gradually reduced so that the molten iron 12 is not sufficiently discharged.

As a result, the molten iron 12 is discharged through the exhaust hole through which the slag is to be discharged, which may cause an equipment accident and a safety accident due to the explosion of the molten iron 12, and the amount of molten iron 12 discharged to the steelmaking process is reduced. Therefore, not only the productivity is lowered, but also the risk of the molten iron 12 flowing out of the large bath 10 by increasing the bottom of the large bath 10. In addition, it is necessary to discharge all the molten iron 12 for maintenance, such as replacement work of the large hot water furnace 10, if there is a solidified layer, the molten iron 12 is caught by the solidified layer is not discharged downstream. There is also the problem of delaying the repair by forming the current floor while remaining solidified without being.

Therefore, it is necessary to periodically remove the silicon solidification layer, conventionally, after lifting the dust collection hood 20 by using a crane or the like, the operator pushes the wood into the skimmer part molten iron 12 and burns it. Oxygen pipes were used to remove oxygen by blowing oxygen into the coagulation layer.

However, since the work is performed at a high temperature of about 1500 ° C., when molten wood is inserted into the molten iron 12 around the water supply, the molten iron 12 is scattered by high heat, and thus, the operation is not easy. In some cases, it is difficult to completely remove the silicon solidification layer because the high temperature causes the pipe to melt on the surface before penetrating into the skimmer part 12.

The present invention has been made to solve the problems of the prior art as described above, the operator can proceed to work through a simple operation without removing the solidified layer of the inside of the large hot water furnace, and also the large hot water furnace An object of the present invention is to provide a molten metal flow path penetrating device in a blast furnace skimmer portion capable of completely removing the silicon solidification layer to the bottom surface of the furnace.

1 is a perspective view showing a general large waterway and a dust collection hood.

FIG. 2 is a side view of the large hot water path shown in FIG. 1.

Figure 3 is a perspective view of one embodiment of the blast furnace skimmer molten iron passage passing apparatus according to the present invention.

4 is an enlarged cross-sectional view of the lance portion in the embodiment shown in FIG.

5 is a side view of the embodiment shown in FIG.

[Explanation of symbols for the main parts of the drawings]

10... ... Skimmer,

12... Molten iron, 20.. Dust Collector,

21. Gate, 22... cover,

23. Gate opening and closing cylinder, 30.. Nozzle,

31. Lance, 35. Flexible hose,

40…. Cylinder, 50... support.

In order to achieve the above object, the present invention has an injection port for injecting oxygen from the oxygen tank at a high pressure, the injection port is bent at a predetermined angle with respect to the longitudinal direction, the outside is covered with refractory; A flexible hose connecting the lance and the oxygen tank; A cylinder connected to an end of the lance to move the lance up and down; It is supported on the upper surface of the dust collection hood covering the large hot-water passage that is the flow path of the molten iron, and a support for fixing the cylinder, wherein the dust collection hood has a gate for allowing the lance to pass through and a cover for opening and closing the gate It is characterized by having.

Since the injection hole is bent toward the skimmer, the angle can be easily changed by those skilled in the art according to the length of the skimmer and the position of the gate, so that the angle is not particularly limited in the present invention. The refractory can also be appropriately selected and used according to the working environment, and preferably a castable material can be used.

In addition, the present invention in the blast furnace flow passage device of the blast furnace skimmer portion, the end of the piston is coupled to the gate by a hinge, the end of the cylinder is fixed to the hinge on the upper surface of the dust collection hood configured to open and close the gate It is another feature to include additionally.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

Referring to FIG. 3, the rectangular gate 21 is formed on the upper surface of the dust collecting hood 20, and the area thereof is formed to such an extent that the lance 31 can pass freely. The cover 21 is installed in the gate 21 to cover the cover 22 in a normal time to block high heat and dust of the molten iron 12. In addition, the gate opening / closing cylinder 23 is installed in the dust collecting hood 20 in a state where one end is fixed by the hinge, and the piston 24 of the cylinder 23 is fixed by the gate cover 22 and the hinge. Therefore, the gate cover 22 can be opened or closed by the expansion and contraction of the gate opening and closing cylinder 23.

The lance 31 is positioned above the gate 21. The lance 31 is connected to the oxygen supply tank through a flexible hose (35). In addition, a cylinder 40 is positioned above the lance 31, and a piston of the cylinder 40 is connected to an end of the lance 31. Accordingly, as the piston of the cylinder 40 reciprocates, the lance 31 reciprocates between the inside of the large water passage 10 and the upper surface of the dust collecting hood 20.

Referring to FIG. 4, the lance 31 has an oxygen passage 32 formed therein, and the passage 32 is formed outside the lance 31 by a nipple 33 inserted through a side surface thereof. Connected with A joint 34 is coupled to an end of the nipple 33, and the flexible hose 35 is connected to the joint 34 so that the hose 35 is not separated even when the lance 31 moves up and down. Will not. The outside of the lance 31 is covered with a castable material to prevent the lance 31 from being dissolved by the hot molten iron 12.

In addition, the injection port 30 of the lance 31 is bent at an angle to the left in Figure 4, that is to face the skimmer 11 when the lance 31 is inserted into the large waterway (10), The angle can be arbitrarily changed by those skilled in the art.

Referring to Fig. 5, the operation of the above embodiment will be described.

First, the piston 21 of the gate opening / closing cylinder 23 is retracted to open the gate 21. Then, oxygen supply is started while lowering the lance 31 using the cylinder 40 connected to the lance 31.

As shown, the silicon solidification layer solidifies on the bottom of the bath 10 and forms a layer, and solidifies on the side and bottom of the skimmer 11. Oxygen supplied while the lance 31 is lowered is first injected into the side of the skimmer 11 to burn off the silicon attached to the skimmer 11 to remove it. Thereafter, when the lance 31 is lowered completely, the injection port 30 is directed to the solidification layer located below the skimmer 11, and combustion of the silicon solidification layer existing at the bottom of the bath 10 by the supplied oxygen. Will be removed.

As a result, the silicon solidification layer positioned in the space between the bottom of the skimmer 11 and the bath 10 may be removed to secure a flow path.

When the removal operation is completed, the lance 31 is raised, and then the cover 21 of the gate 21 is covered to block high heat and dust of the molten iron 12.

According to the present invention having the configuration as described above, the operator can remove the silicon solidification layer by remote operation, it is possible to prevent the occurrence of a safety accident. In addition, since the work can be carried out without lifting the dust collection hood, it is possible to drastically reduce the working time to significantly improve productivity.

Claims (2)

A lance (31) having an injection hole (30) for injecting oxygen from the oxygen tank at a high pressure, the injection hole (30) being bent at a constant angle with respect to the longitudinal direction, and the outside being covered with refractory; A flexible hose 35 connecting the lance 31 and the oxygen tank; A cylinder (40) connected to an end of the lance (31) for moving the lance (31) up and down; Supported on the upper surface of the dust collecting hood 20 covering the large hot water path 10 that is the flow path of the molten iron 12, the support 50 for fixing the cylinder 40; consisting of, the dust collecting hood 20 The molten iron flow path through the blast furnace skimmer portion, characterized in that it has a gate (21) for allowing the lance (31) to pass through and the cover (22) for opening and closing the gate (21). The method of claim 1, An end of a piston is coupled to the gate 21 by a hinge, and an end of the cylinder 23 is fixed to the upper surface of the dust collecting hood 20 by a hinge to open and close the gate opening and closing cylinder 23 configured to open and close the gate 21. The molten iron flow path through the blast furnace skimmer portion, characterized in that it further comprises.