KR100843859B1 - An apparatus for preventing damage to splash cover of main runner of blast furnace - Google Patents

Abstract

The present invention is to install a detachable wear-resistant cover on the inside of the splash cover forming the large hot water cover to prevent damage to the hot water cover by the hot air and melt during hot air operation performed during the emergency operation of the furnace. The present invention relates to a splash cover damage preventing device of a furnace.

According to the present invention, a long groove is formed in the central upper surface of the splash cover adjacent to the furnace side, and the long groove is fitted with a plurality of upper ends of the body of the wear preventing cover made of steel, respectively, in the lower side of the body. As the refractory is attached and its lower surface is arcuately curved, the melt cover and the high-pressure air discharged from the outlet of the blast furnace collide with the lower surface of the refractory and are reflected downward from the splash cover side, thereby causing damage to the splash cover. Provides a splash cover damage prevention device of the furnace is also configured to prevent.

Furnace, melt, large hot water cover, refractory damage, exit port, splash cover

Description

Splash Cover for Preventing Damage of Furnace Large Baths {AN APPARATUS FOR PREVENTING DAMAGE TO SPLASH COVER OF MAIN RUNNER OF BLAST FURNACE}

1 is a work flow chart for explaining a general furnace operation;

2 is an explanatory diagram showing each step of the furnace operation.

         a) is the state diagram at the beginning of the starting line,

         b) is a state diagram at the time of normal departure,

         c) is a state diagram at the time of deduction work at the end of embarkation;

3 is a cross sectional view along line A-A in FIG. 2A;

4 is a block diagram showing the degree of damage to the tongkaba of the general furnace large baths;

5 is a cross-sectional view showing a state in which the tongkaba of the general furnace large tap water damaged by the melt;

6 is a perspective view equipped with a splash cover damage prevention device according to the present invention;

7 is a cross-sectional view of the splash kaba damage prevention apparatus according to the present invention mounted on the splash kaba;

8 is a front view of the spout of the splash kaba damage preventing apparatus according to the present invention mounted on the splash kava;

9 is an operational state diagram of the splash cover damage prevention apparatus according to the present invention.                 

       <Description of the symbols for the main parts of the drawings>

10 ..... Anti-wear Cover 12 ..... Body

15 ..... refractory 17 ..... recess

200 .... 210 Blast Furnace

212 .... exit 220 .... big bath too

223 .... Cover cover 230 .... Splash Cover

240 .... Fixed Caba 242 .... Chartered Tango

245 .... Slag Tangdo 246 .... Gyeongjutong

247 .... Crosstalk P ..... Melt

    The present invention relates to an apparatus for minimizing the refractory damage of the large hot water tank cover through which the melt flows during the process of drawing out the blast furnace of the steelmaking process. Installed in the emergency operation of the furnace, relates to a splash cover damage prevention device of the furnace large hot water to prevent damage to the hot water and the cover by the hot air and melt.

In general, the furnace operation process, as shown in Figure 1, through the charging hole in the upper of the furnace 200 to charge the fuel coke and iron ore as a raw material, and the high temperature through the tuyere 210 in the lower part of the furnace. Hot air is blown to combust coke to produce heat and reducing gas. The heat and reducing gas generated in this way is reduced and melted iron ore in the furnace to generate molten iron and slag, the melt is discharged through the outlet 212 of the lower furnace 200 through the large bath 220 connected to it. The flow, and the tub cover 223 is covered on the large bath 220.

Here, the tub cover 223 located on the circumference of the blast furnace 200 covers the molten water discharged from the outlet 212 of the blast furnace 200 and the large bath 220 through which melts such as slag flow. It is a facility to protect worker and surrounding equipment from scattering or high heat of melt and to prevent solidification by cooling of melt. As shown in FIGS. 2 and 3, the tong cover 223 is constructed of a channel-shaped steel bar 225 that has an irregular refractory material 227 that can withstand high heat, and has a fixed thickness. (Not shown), the splash cover 230 having a predetermined length is formed near the furnace 200 side, and the fixed cover 240 is disposed at the rear side thereof.

    As such, the large bathway 220 of the furnace 200 has a large specific gravity (about 7) and a relatively small specific slag (about 3) due to the specific gravity difference while the melt flowing through the outlet 212 passes. The molten iron and the slag are separated into the molten iron layer, and the molten iron and slag are separated by a skimmer (not shown) at the rear of the large bath. It flows separately. As described above, the molten iron flowing into the molten iron bath 242 is contained in the mixed car 247 through the raceway 246 and moved to a steelmaking plant, which is a post-process.                         

Then, the slag flowing through the slag runway 245 is separated and processed into a lump aggregate used as a building material and a timber used as a raw material of cement.

On the other hand, the tapping operation for discharging the melt generated in the furnace 200 is shown in Fig. 2, since the tapping opening 212 is not completely open at the beginning of the tapping, the molten discharge is not much, so the taping opening ( The melt fall distance from 212) is short, and the possibility of damaging the barrel cover 223 is low.

However, when the tapping opening 212 is opened and a certain time passes, the tapping opening 212 is completely opened, the taping opening 212 is enlarged by abrasion, and the amount of melt flows a lot. The melt fall distance is long, the temperature inside the barrel cover 223 rises to 1500 ° C or more, and the castable refractory 227 inside the barrel cover is glowing.

When the discharge of the melt is almost completed through the outlet 212, the melt and the high pressure hot air in the furnace (about 1500 to 1800 ° C.) are discharged out of the outlet so that a so-called “air blow” operation is performed. The melt and the high-pressure air is hitting the splash cover 230 of the upper large hot water, the angle (θ) of the exit port is approximately 10 degrees upwards, the direction of cavitation is the upper direction of the large hot water 220 Is ejected to reach the rear end of the splash cover 230 and the fixed cover 240.

Therefore, if such a state of detention is maintained for a long time, as shown in Figs. 4 and 5, the tong cover 223 is damaged. In general, the operation is carried out to prevent possible deodorization during daily operation, but once deduction occurs, the central part is worn locally.

As described above, when the tub cover 223 draws the molten water from the furnace 200, the melt of the high temperature (1500 ° C. or more) and the high pressure (3 to 5 kg / cm 2) is ejected upward from the tap opening 212. In addition, since the size and shape of the tongkaba 223 is also limited to interference with the peripheral equipment, the melt intensively hits the central portion of the splash cover 230 located in front of the outlet opening 212, which damages the erosion.

The locally damaged portion of the tongaba 223, such as a high temperature melt is scattered to generate a fire, using a kaba hoist 260 on the side of the tongaba 223 to replace the damaged tongba 223 during operation. In this case, there is a problem that the load of the worker is excessive as the work is performed under high heat.

In order to solve such a problem, conventionally, a cooling pipe (not shown) capable of passing a cooling water between the shell 225 and the refractory 227 of the tongkabar as a means for lowering the temperature of the tongkabar 223 during the ship. There is a way to insert it. However, this method is somewhat effective when the initial melt flows less, but when the internal temperature rises above 1500 ° C. due to the large amount of melt as in the normal discharge, the cooling water in the cooling pipe is vaporized to stop the flow of the cooling water. There was a problem of interrupting and damaging the cooling piping.

The present invention has been made to solve the above-mentioned conventional problems, and its purpose is to prevent the scattering of the melt on the front end of the splash cover during the end of the embarkation work where the damage of the tow cover is high, and the melt is directly added to the cover of the cover. Prevents damage to the splash cover by increasing the service life by preventing the refractory damage of the splash cover, and by replacing the finished parts with ease, greatly improving the efficiency of maintenance work. It is in providing.

In addition, the present invention is to provide an apparatus for preventing damage to the splash cover of the blast furnace large hot water can minimize the wear of the local refractory to increase the overall hot water even cover.

In order to achieve the above object, the present invention, in the apparatus for minimizing the refractory damage of the large hot water Kaba flowing through the melt of the furnace, forming a long groove on the central upper surface of the splash cover adjacent to the furnace side, The long groove is fitted with a plurality of lines of the body of the wear-resistant cover made of iron shells in a row, the refractory is attached to the lower side of the body, each of which melted from the outlet of the furnace by forming an arcuate surface By providing a high-pressure air splash damage device to the furnace, characterized in that configured to prevent damage to the splash cover by colliding with the lower surface of the refractory and reflected downward from the splash cover side. All.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

Splash cover damage prevention device (1) of the furnace large hot water in accordance with the present invention is carried out for a long time to enhance the melt (P) discharge during the emergency operation of the furnace 200, wherein hot air and hot melt ( The large bath is also to prevent the tongkaba 223 is damaged by P).

Splash cover damage prevention device (1) of the furnace large-scale water in accordance with the present invention, as shown in Figure 6, to form a groove 5 in the longitudinal direction on the side of the splash cover 230, the groove (5) There is a plurality of anti-wear cover (10) made in the form of "T" is fixed to fit.

The wear-resistant cover 10 is arched to prevent the melt (P) from directly contacting the splash cover (230) to prevent the scattering of the melt (P) coming out through the outlet 212, respectively. The surface of the.

And, the wear-resistant cover 10 is the top of the body 12 has a "T" shaped structure, made of iron material to withstand the impact transmitted from the outside when moving, the lower portion of the body 12 The high-quality standard refractory material 15 is attached to the surface to withstand high temperatures, and the lower surface of the refractory layer 15 is arcuate.

And, each of these wear-resistant cover 10 is to be able to be assembled by a number of pieces by varying the number of mounting according to the length characteristics of the splash cover 230, so that some of the damage during operation It can be replaced locally.

Such a plurality of anti-wear cover 10 forms a concave portion 17 of reduced diameter between the middle portion of the body 12 and the "T" shaped structure at the top to form such a concave portion 17. It is mounted to the splash cover 230 through.

In this case, the splash cover 230 has a long groove 5 is formed in the center by a predetermined length from the edge adjacent to the furnace 200 side, so that the recessed portion 17 is inserted into the long groove 5, so that a plurality of When mounted, the refractory material of the wear protection cover 10 covers the inner surface of the upper side of the splash cover 230.

Referring to the operation and effects of the present invention configured as described above are as follows.

As shown in FIGS. 7 and 9, the splash cover device 1 of the present invention of the blast furnace large tap road is about 10 from the blast furnace outlet 212 when the deodorizing operation is performed at the end of the blast furnace starting operation. The melt P consisting of molten iron and slag of high temperature (1500 ° C. or more), high pressure (3 to 5 kg / cm 2), which is concentrated in the upward direction of °, reaches the lower surface of the wear protection cover 10.

In this case, the lower surface 15a of the refractory 15 of the wear-resistant cover 10 collects the melted P scattered on the arcuate lower surface while the flowing direction of the melted P is deflected downward and reflected. The refractory of the splash cover 230 of 220 is protected.

In this way, the wear-resistant cover 10 to protect the splash cover 230, the refractory (15) is worn or damaged locally or over time when used for a long time, depending on the degree of wear replace the worn parts with new It can be done.

In this case, only some of the anti-wear cover 10 can be replaced, so that the effect of the present invention can be continued, and thus, the life of the ton cover 230 can be made much longer than before.

    Therefore, according to the present invention, the thermal and physical using the anti-wear cover 10 equipped with the present invention that the melt (P) of the hot and high pressure in the furnace draw operation intensively hits only a specific portion of the splash cover (230) By effectively controlling the impact, it is possible to protect a specific portion of the splash cover 230 of the tong cover 223.

In addition, in the present invention, the hot air and the melt P do not collide with the splash cover 230 at the time of the deodorization at the end of the starting line, and the flow path of the melt P changes direction from the top to the bottom, When the melt P is ejected from the precursor 212, the width of the melt P is prevented from widening as it moves away from the outlet 212, so that most of the melt P is formed by the arcuate lower surface 15a. Collected is to change the direction toward the bottom of the large bath (220). Therefore, the lifetime of the splash cover 230 can be greatly increased, and at the same time, the life of the fixed cover 240 at the rear end thereof can be increased. Therefore, the maintenance work associated with the loss of the splash cover 230 is greatly reduced, and in the case of the local wear of the wear-resistant cover 10, only a corresponding part can be easily replaced, thereby greatly reducing the maintenance work and thereby reducing the production cost. It is possible to reduce.

Claims (3)

In the apparatus for minimizing the refractory damage of the tongkaba 223 through which the melt P of the furnace 200 flows, Long grooves 5 are formed in the central upper surface of the splash cover 230 adjacent to the furnace 200 side, and the upper grooves 5 have upper ends of the body 12 of the wear protection cover 10 made of steel. It is fitted in a plurality of lines, the refractory 15 is attached to the lower side of the body 12, the lower surface of each of the melt discharged from the outlet 212 of the furnace 200 by forming an arcuate curved surface ( P) and the high pressure air collides with the lower surface of the refractory 15 and is reflected downward from the splash cover 230 side to prevent damage to the splash cover 230 is characterized in that Splash Cover Damage Prevention Device 2. The wear-resistant cover 10 according to claim 1, wherein the anti-wear cover 10 forms a concave portion 17 having a reduced diameter between the middle portion of the body 12 and a "T" shaped structure at the top. The splash cover of the furnace cover of the melting furnace, characterized in that the fitting through the groove (5) of the splash cover (230) through (17). According to claim 1, wherein the wear-resistant cover 10 is made of iron to withstand the impact that the body 12 is transmitted from the outside, and the lower surface of the body 12 to the high-grade orthogonal refractory 15 to withstand high temperature Is attached, the lower surface of the refractory layer (15) is the apparatus for preventing damage to the splash cover of the furnace large hot water, characterized in that forming an arc.

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