KR20010019061A - A method of preventing closing of a skimmer in a runner of furnace - Google Patents

Abstract

PURPOSE: A method for preventing clogging of skimmer lower part of a blast furnace molten pig iron runner is provided to prevent accidents of facility or safety by stacking a heat generating means on front part of a skimmer before molten materials discharged from a tap hole are injected between skimmer lower part and floor of a large runner so that molten pig iron is smoothly passes through the skimmer. CONSTITUTION: A method for preventing clogging of skimmer lower part of a blast furnace molten pig iron runner consists the processes of stacking a heat generating means on front part of a skimmer located in runner before molten pig iron is flown into runner through a tap hole from a blast furnace, generating heat by reacting the heat generating means with the molten pig iron, and maintaining heat surround the runner and skimmer with the generated heat so that an opening formed at lower part of the skimmer is not clogged by the molten pig iron. The molten pig iron is smoothly discharged into lower part of the skimmer, and a slag filtered by the skimmer is smoothly discharged into an ash discharge hole.

Description

A method of preventing closing of a skimmer in a runner of furnace}

The present invention relates to a method for preventing clogging of the lower part of a skimmer of a blast furnace molten iron, particularly in a skimmer where pure molten iron and slag are separated in a molten iron melted water flowing through the melt discharged from the blast furnace outlet. The present invention relates to a method for preventing clogging of the skimmer bottom of a blast furnace molten metal furnace that instantaneously generates exothermic reactions so that the melted portion 4-2 smoothly flows when the melted and slag melt 4-1 solidifies.

Figure 1 is a state diagram of the melting of the skimmer solidification operation of the prior art, Figure 2 is a cross-sectional view of the internal structure and skimmer of the large-scale water, the furnace is put iron ore and coke and limestone inside the furnace to blow hot wind iron ore and coke (COKE) Reducing reaction with each other to generate high heat to produce the molten water (4-2) and slag (4-1) and discharged to the outside of the furnace through the outlet (1).

As shown in FIG. 2, the discharged molten metal and slag are slammed with a specific gravity of 7.8 and the slag of a specific gravity slag (SLAG) by the skimmer 8 installed in the large bath. It flows down to 2 blocks (9) through the gap in the lower part (between the bottom of the bath and the lower part of the skimmer), and the light weight slag does not pass through the skimmer because it is floated on the water and flows to the outlet (6). .

In this case, the refractory in the large hot water can be eroded when the large hot water is used for a long time, so the melt can be leaked to the outside.

Normally, the inspection period is to perform the first inspection by residing at 60.000 ± 10.000 and the additional inspection every 14.000 ± 2.000 ton increase, and the entire refractory at 15.000 ± 10.000 ton Stand by until the next use.

Like this, Daetangdo starts to be used for the first time and is repaired about 6 ~ 7 times.

The afterglow treatment operation passes through the remnant hole 7 provided in the lower part of the large tap water to discharge the melt accumulated in the large tap water to check the empty tap water. The hot water is cooled down because it is 7 to 8 hours old when it is reused after full or partial repair. Therefore, since the large melt absorbs the temperature of the melt flowing through the outlet 1, the fluidity of the melt is inferior.

As shown in FIG. 2 to be described later, the lower part of the skimmer is solidified when the slag and the molten metal, which are melts coming out of the exit hole, are not good because the distance between the lower part of the skimmer 8 and the large bath 5 is about 150 mm. Blocked

When the lower part of the skimmer 8 solidifies, the molten water from the exit flows into the slag runner and the dry pit (not shown), which is a facility for storing and cooling the slag, explodes or the slag overflows to the upper side of the large bath (5). Flowing can occur, causing worker safety accidents and mechanical accidents.

According to the related art, in order to prevent the skimmer from solidifying, as shown in FIG. 1, the oxygen pipe used to penetrate the outlet port is ignited to generate high temperature heat so that the molten metal flows smoothly to the bottom of the second block 10. The worker continued to melt the oxygen pipe until it descended.

When oxygen pipe is used, the oxygen pressure is high pressure 16kg / ㎠ so that the melt can be scattered on the front of the worker and the worker 3 can be burned.If the melt is discharged in large quantity from the exit port 1, the lower hole of the skimmer will not be completely penetrated. If not, the melt level gradually rises in the large hot water, causing an accident overflowing into the upper hot water.

The present invention is to solve the above problems, before the molten material discharged from the exit port is introduced between the bottom of the skimmer and the bottom of the large waterway so that the heat generation means to the front of the skimmer to allow the molten iron to smoothly pass through the skimmer. The purpose of the present invention is to provide a method for preventing clogging of the skimmer under the blast furnace molten iron which can prevent facility accidents or safety accidents.

The above object is to load the heat generating means in the front end of the skimmer located in the waterway before the molten iron flows through the outlet from the blast furnace, and the heat generating means and the molten iron reacts to generate heat And maintaining the heat around the runway and the skimmer by the generated heat so that the molten iron does not block the opening formed in the lower portion of the skimmer, and the molten iron is smoothly discharged to the lower portion of the skimmer. The slug filtered by the skimmer is smoothly discharged to the exhaust outlet, it is achieved by the skimmer bottom block prevention method of the blast furnace molten iron.

In addition, the heat generating means includes a blast furnace shell made of a cylindrical pipe and the graphite powder contained in the blast furnace iron shell as the carbon component in the graphite powder and the iron oxide in the molten iron reacts to generate heat, thereby surrounding the skimmer. It is characterized by preventing the cooling of.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the skimmer solidification part melting | working state of the prior art.

2 is a cross-sectional view of the internal structure and skimmer.

Figure 3 is a state of the invention skimmer solidification unit heat generation means input.

4 is a cross-sectional view of the skimmer heat generating means of FIG.

5 is a view for explaining a method of calculating the heat generation means (dissolution) input amount.

<Description of the code | symbol about the principal part of drawing>

1: TAP HOLE 2: Large bath cover (COVER)

3: Skimmer penetrator 4: melt from the blast furnace

4-1: slag melt 4-2: melt

5: Tando 6: Exhaust

7: Afterglow hole 8: Skimmer

9: 2 block (BLOCK 10)

11a: outer shell for heat generating means 11b: cap for heat generating means

11c: graphite powder 12: hopper for dissolving material storage (HOPPER)

13: CONVEYOR BELT

14: CONVEYOR BELT DRIVING MOTOR

15: Valve for discharging heat generating means

Hereinafter, with reference to the accompanying drawings will be described the present invention.

3 is a diagram illustrating a state in which the skimmer solidification unit heat generation means is introduced, FIG. 4 is a cross-sectional view of the skimmer heat generation unit, and FIG. 5 is a view for explaining a method of calculating a heat generation means input amount.

In the present invention, the conveyor belt 13 is installed at the bottom of the hopper 12, which can constantly store the heat generating means, and is inserted into the bottom of the skimmer before the opening of the exit opening. The site is raised in temperature to prevent the melt from solidifying.

It is a situation diagram to transfer from the storage hopper 12 containing the heat generating means to the skimmer. On the site, the operator operates the motor 14 on the heat generating means transfer operation panel (not shown) to check that the conveyor belt is fed, and then opens the heat generating means discharge valve 15 installed under the hopper to open the heat generating means. Loaded on top of the conveyor belt (13) so that the large bath is also stacked in front of the skimmer.

The cross-sectional structure of the skimmer solidification heat generating means has a sealing stopper 11b which can seal the graphite powder 11c in a certain container (thin iron plate type) 11a which is insoluble in the slag, and the lower part of the container has a slab. Make it heavy to avoid injury.

The reason is that if the container is light, the slag comes out of the exit first, so the heat-generating means will not be able to react with the water, so the bottom of the container will be heavy and the container will meet with the water and the outer shell will melt. ) And chemical reaction with iron oxide (Feo) to produce high heat. The chemical formula is as follows.

Feo + C-> Fe + Co + 26.5 kcal

If the amount of heat generated above the erosion of the skimmer lower occurs early, if the amount of heat generated less skimmer clogging occurs, it is necessary to adjust the input amount of the heat generating means for preventing the coagulation of the skimo.

The dose is calculated when calculating the quantity indicated in the cross section of the skimmer shown below.

((2115 + 1800) * 400 * 800/2) / 1000000000 = 0.63㎥

The most suitable volume is 0.63m 3 ± 0.05m 3.

As described above, the chemically generated heat keeps the skimmer at a high temperature, thereby improving the fluidity of the slag or molten metal and preventing the melt from solidifying due to a drop in temperature between the lower portion of the skimmer and the large bath. Therefore, since the lower part of the skimmer solidifies and does not penetrate the oxygen pipe, the safety accidents such as the risk of worker burn due to the scattered melt disappear, and the overflow bath and dry pits are exploded in terms of equipment. The equipment accident caused by disappears.

Claims (2)

Loading heat generating means on the front end of the skimmer located in the waterway before the molten iron flows from the blast furnace to the waterway through the exit; Reacting the heat generating means and the molten iron to generate heat; And maintaining the heat around the runway and the skimmer by the generated heat so that the molten iron does not block the opening formed in the lower portion of the skimmer, and the molten iron is smoothly discharged to the lower portion of the skimmer. A method for preventing clogging of the lower part of a skimmer of a blast furnace molten iron furnace, characterized in that the slug filtered by the filter is smoothly discharged to the exhaust outlet. The method of claim 1, The heat generating means includes a blast furnace shell made of a cylindrical pipe and graphite powder contained in the blast furnace iron shell, and the carbon component in the graphite powder and iron oxide in the molten iron react to generate heat, thereby generating heat. A method for preventing clogging of the skimmer bottom of a blast furnace molten iron water, characterized by preventing cooling.