KR101076164B1 - Apparatus for crushing out side wall of tuyere of blast-furnace - Google Patents

Abstract

The present invention relates to an apparatus for opening a tuyere of a smelting furnace for easily removing a flower pot or a semi-melt by forcing the metal bead to the tuyere side to close the mouth of the tuyere.

The structure is connected to the furnace vents to supply the hot air from the hot air fan to the inside of the furnace, and the end penetrates into the inside of the blow pipe and is connected to the furnace vents to supply the pulverized coal into the furnace with the air pressure supplied from the air pipe. It is provided with a supply pipe for supplying, and a bead inlet is arranged so as to communicate between the supply pipe and the air pipe, and the metal ball is selectively introduced into the supply pipe and pressurized by the air pressure to the furnace air vent side.

According to the present invention, by using the air pressure used in the existing pulverized coal blowing device to press the metal bead to the inlet side of the air port, it is possible to quickly and easily remove the pollen or semi-melt, it is possible to prevent safety accidents and improve workability Has a useful effect.

Description

Opening opening for blast furnace {APPARATUS FOR CRUSHING OUT SIDE WALL OF TUYERE OF BLAST-FURNACE}

The present invention relates to an apparatus for opening a tuyere of a blast furnace, and more particularly to a structure in which the structure of the blast furnace is improved so as to quickly and easily remove a flower pot or semi-melt closing the entrance of a plurality of tuyere by forcing a metallic bead to the tip of the tuyere. It relates to a tuyere opening device.

In general, the pulverized coal used in the blast furnace plant of steel mill is non-coking coal, and it is used directly in the blast furnace without going through the COKE process, thereby reducing the cost of molten iron production and suppressing the generation of blast furnace inert zone, which was a problem in the management of yellowing during COKE production. It is used for the purpose of improving the yellowing of the back.

Therefore, the blast furnace plant of the steel mill is equipped with a pulverized coal blowing facility to improve the operation and efficiency of the facility and at the same time strive to increase the pulverized coal blowing amount by developing the pulverized coal blowing operation technology.

The injection of pulverized coal into the blast furnace is carried out through the blow lance when the hot air is injected into the blast furnace by using 42 blast holes per blast circumferential direction to inject the hot air generated from the blast furnace into the blast furnace. Is put into.

This is a schematic cross-sectional structure diagram of one of the 42 tuyere, which is provided on one side of the furnace wall as described herein, and the pulverized coal supplied through the blown lance is supplied when the hot air of the blower pipe is introduced into the blast furnace through the tuyere. A blowhole is installed to be sucked inside.

 As illustrated in FIG. 1, a hot air blower that blows hot air into the furnace 10 is joined to the air vents 22 of the furnace 10 through blow pipes. It is inserted and fixed in the furnace shell 12 and the refractory lead 14, and the hot air fan is located at a high temperature in the furnace (blast furnace; 10) of about 2000 ° C and at the shortest distance, and has a high temperature of about 1280 ° C through the nozzle part inside. Phosphorus hot air is blown into the blast furnace 10, and at this time, the tuyere 24 integrally formed in front of the large tuyere 22 serves as a passage for the hot wind.

In addition, the front of the hot air blower has a blow pipe 30 to create an inflow passage of the hot air, and at the same time, the pulverized coal lance serves to blow the pulverized coal into the blast furnace (blast furnace) to secure calories.

At this time, the hot air blown into the furnace helps combustion of the coke (COKE) in the furnace 10 and makes a combustion zone, so that the ore in which the layers are stacked is melted and melted, and the applied hot air is blow pipe of the blower 10. (30) It spreads in the shape of a rubber balloon at the tip and flows into the blast furnace 10, and due to the high temperature and falling iron ore in the blast furnace (blast furnace) 10, the tuyere easily wears its tip part or causes erosion periodically. Must be replaced.

However, the replacement of the tuyere is carried out in a state in which no air is blown into the furnace (blast furnace), that is, in a state of idle air, and the surrounding air of the tuyere 24 drawn out of the blow pipe after the melee is introduced into cold air. As a result, the coke and semi-melt around the tuyeres 24, for example, the molten metal and the slag-mixed semi-melt, hardens to form the outer wall of the tuyere, which is smooth when the next new tuyere is inserted. It will need to be removed because it interferes with the insertion.

In addition, since it is closed by using the tuyere membrane pollen 25 in the tip of the tuyere for securing the tuyere flow rate and partial airflow during the replacement operation, it is required to remove the pollen in addition to the semi-melt described above when using the tuyere.

The removal of the pollen and the semi-melt is performed by first removing the blow pipe and the tuyere 24, and then removing the tuyere 22 from the shell 12 of the furnace, around the tuyere 24 of the tuyere 22. The coke and the semi-melt in the furnace will be in a hardened state, and the coke and the semi-melt are located inside 1.5 m away from the shell 12 of the actual furnace 10, and the space is also narrow to 400 mm. Removing the situation is difficult.

That is, since the work place is narrow and deep inside the furnace 10, it is difficult to break the hardened furnace coke and the semi-melt 160, and the work load is increased due to the high temperature of the surrounding work place, which requires a large number of workers. Done.

Therefore, in the past, one worker supported a long pipe-type jig and another worker hit the jig as a hammer to remove coke and semi-melt, but other workers should check for the degree of fracture. The work was cumbersome and the work time was delayed considerably.

The present invention has been proposed in view of the above-mentioned problems, and an object thereof is an apparatus for opening a tuyere of a smelting furnace whose structure is improved to quickly and easily remove the work of removing pots and semi-melts for closing tuyere. To provide.

The present invention for achieving the above object is a blow pipe connected to the furnace tuyere side,

A supply pipe connected to the blow pipe and supplying pulverized coal into the furnace at an air pressure supplied from an air pipe;

It is disposed so as to communicate between the supply pipe and the air pipe, characterized in that it is provided with a bead inlet for feeding the metal sphere to the inside of the supply pipe selectively via the input means to press the air pressure to the furnace vent side.

The bead inlet is disposed on the upper side of the supply pipe, the inlet is formed in the upper than the inner diameter.

The inlet means is an on-off valve disposed on the upper and lower portions of the bead inlet is divided based on the air pipe;

It is provided with a supply valve disposed in the supply pipe for opening and closing the supply pipe in accordance with the operation of the opening and closing valve.

The present invention is to be able to easily remove the pollen or semi-melt to close the inlet of the tuyere by pumping the metal bead to the tuyere side, according to the present invention by using the air pressure used in the conventional pulverized coal blowing device Since the beads can be pumped to the inlet side of the tuyere quickly and easily to remove the pollen or semi-melt, it is possible to prevent a safety accident and has a useful effect of improving workability.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the same components as those of the conventional components described above will be denoted by the same reference numerals and redundant descriptions will be omitted.

When the apparatus for opening the tuyere of the furnace according to the present invention is described with reference to FIGS. 2 and 3, the configuration is connected to the furnace tuyeres 24 to supply the hot air from the hot air fan 50 into the furnace 10. A blow pipe 30 and an end portion are penetrated into the blow pipe 30 to be connected to the furnace 10 air port side and supplied to supply the pulverized coal into the furnace 10 at an air pressure supplied from the air pipe 250. It is arranged to communicate between the pipe 110 and the supply pipe 110 and the air pipe 250, and the metal sphere (B) is selectively introduced into the supply pipe 110 to the furnace 10 air vent side by air pressure. It is provided with a bead inlet 200 for feeding.

In more detail, the bead inlet 200 has a structure having a passageway of the upper and lower openings and a hollow shape therein, disposed on the upper side of the supply pipe 110, and has an inner diameter larger than the inner diameter of the passage at the top. A funnel-shaped inlet 210 having is formed.

Preferably, the bead inlet 200 is to be disposed on the upper side of the supply pipe 110 at an inclined angle to the entrance to the vent opening side of the metal ball (B).

Here, the metal ball (B) is preferably used to adopt a metal bead of the iron component so as not to impair the properties of the molten iron even if it is introduced into the furnace 10.

In addition, the bead inlet 200 is connected to the air pipe 250 in the middle portion, and is provided with a means for injecting the beads of the metal sphere (B) into the supply pipe (110).

The inlet means is disposed on the upper and lower portions of the bead inlet 200 divided into upper and lower parts on the basis of the air pipe 250, the opening and closing valves 310 and 320 to selectively open and close the passage in the bead inlet 200 And a supply valve 115 disposed in the supply pipe 110 to open and close the supply pipe 110 according to an operation of the on / off valve.

In addition, it is preferable that the charging means further includes an air valve 330 disposed in the air pipe 250 to selectively open and close the air pipe 250.

Hereinafter, the opening and closing valves 310 and 320 are located at the upper portion of the first opening / closing valve 310, and the lower opening and closing valves 310 and 320 are referred to as the second opening / closing valve 320.

The first and second open / close valves 310 and 320 may employ butterfly valves for manually operating the inside of the passage in a rotatable manner, or may employ solenoid valves that can be opened and closed automatically when an external power source is applied.

The first opening / closing valve 310 is a valve used when the metal ball B is introduced into the bead inlet 200 from the outside, and performs a function of opening and closing the outside and the passage at the top of the bead inlet 200. As a result, the air pressure in the supply pipe 110 is prevented from being discharged to the outside.

The second opening / closing valve 320 is a valve for injecting the metal ball B located in the passage of the bead inlet 200 into the supply pipe 110.

The supply valve 115 has a correlation to operate so that the supply pipe 110 is closed in order to block the supply of pulverized coal on the contrary during the opening operation of the first and second open / close valves 310 and 320.

Metal spheres (B) is preferably added to about 2 to 5 to suit the pressure of the air (about 5 ~ 10kgf / ㎠), but is not limited thereto.

The operation of the present invention having such a configuration will now be described.

The furnace tuyere opening device according to the present invention, when the heat exchanger 50 is replaced or other reasons for closing the tuyere 24 with the pot (25), or when the half-melt is blocked by the inlet wind to remove the entrance of the tuyere 24 For this purpose, the pollen 25 or semi-melt is conveyed by using a pressure of an air compressor (not shown) in which pulverized coal is blown into the blast furnace 10 to press the metal ball B, which is a metal ball, to the air vent side. Crush to remove it.

At this time, the metal ball (B) is introduced into the supply pipe 110 through the inlet 210 of the bead inlet 200, and is then pumped to the front end side of the tuyere 24 by air pressure pollen (25) Alternatively, the pollen 25 or the semi-molten material which collides with the semi-melt directly and closes the entrance of the tuyeres 24 is crushed.

In the process of inserting the metal sphere (B) first, the supply valve 115 is turned off to block the pulverized coal from flowing into the supply pipe 110, and then the second open / close valve 320 is closed and the air valve 330 is closed. In the closed state to open the first opening and closing valve 310 to insert the metal ball (B) to be located inside the bead inlet 200, the second opening and closing valve 310 in the closed state Open 320 and open the air valve 330 to press the metal sphere (B) through the supply pipe 110 at the air pressure to the air port 24 side to hit the pollen 25 or semi-melt.

On the other hand, after the addition of the metal ball (B) is completed and the pollen 25 or the semi-melt is removed again the second opening and closing valve 320 and the air valve 330 to close the unnecessary air into the furnace 10 Block incoming

On the contrary, when the pulverized coal is injected, the pulverized coal may be introduced into the furnace 10 by air pressure by opening the air valve 330, the second open / close valve 320, and the supply valve 115.

1 is a block diagram showing a process of opening the tuyere of the conventional furnace.

Figure 2 is a block diagram showing a tuyere opening device of the furnace according to the present invention.

3a and 3b are explanatory views sequentially showing a process of removing the flower pot by being pushed to the air vent side by air pressure of the metal sphere of the present invention.

Explanation of symbols on the main parts of the drawings

10: furnace 24: blowhole

30: blow pipe 110: supply piping

115: air valve 200: bead inlet

210: inlet 250: air piping

310,320: first and second open / close valve 330: air valve

B: metal sphere

Claims (3)

A blow pipe 30 connected to the furnace 10 wind port side, A supply pipe 110 connected to the blow pipe 30 and for supplying pulverized coal into the furnace 10 through the blow pipe 30; A bead inlet 200 connected to the supply pipe 110 to inject the metal sphere B of the iron component into the supply pipe 110; An air pipe 250 connected to the bead inlet 200 to pressurize the metal sphere B to the blast furnace side; And Including means for injecting the metal sphere (B) selectively into the supply pipe 110, The metal ball (B) is pushed toward the tuyere 24, the tuyere opening device of the furnace, characterized in that to remove the material blocking the entrance of the tuyere (24). The method according to claim 1, The bead inlet 200 is disposed on the upper side of the supply pipe 110, the mouth opening device of the furnace, characterized in that the inlet 210 is formed larger than the inner diameter on the top. The method according to claim 1 or 2, The inlet means is the on and off valves 310 and 320 are respectively disposed on the upper and lower portions of the bead inlet 200 is divided based on the air pipe 250, An air valve 330 disposed on the air pipe 250 to selectively open and close the air pipe 250; And And a supply valve 115 disposed on the supply pipe 110 to open and close the supply pipe 110 according to an operation of the on / off valves 310 and 320.

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