JPS6328809A - Method and apparatus for closing tap hole of blast furnace - Google Patents

Abstract

PURPOSE:To permit the ensuing tapping operation without allowing molten iron and gas to leak from the tap hole of a blast furnace by packing mud into the tap hole, passing a steel bar therein by utilizing a specifically constructed closing jig and closing the tap hole at the time of closing the tap hole of the blast furnace. CONSTITUTION:The tap hole 2 is closed upon ending of the tapping operation of the blast furnace. The raw mud 3 is first packed into the tap hole 2 and before the mud is securely calcined and solidified at the furnace temp., a steel bar 4 is put into the closing jig 5 consisting of a cylindrical steel bar guide material 51 having a tap member 52 is put therein and the tap member 52 is hammered by a driving jig 6 and is advanced into the uncalcined mud. The member is so inserted that the front end thereof exists in the furnace and the rear ends exists on the outside of the furnace. The driving jig 6 is removed when a sealing packing 55 at the front end of the steel bar guide material 51 contacts the mud 3. Monolithic refractories 71 in a tank 72 are then force-fed by gas and are forced into the furnace from the outside peripheral part of the steel bar 4. The leakage of the molten metal and the ejection of the in-furnace gas from the tap hole 2 are obviated after the calcination and solidification of the mud 3. The tapping is easily executable simply by shaking the steel bar and pulling the bar from the mud at the time of the ensuing tapping.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for closing a blast furnace taphole and an improvement to the device.

Conventional technology The conventional method for closing the taphole of a blast furnace was to use a mud gun to fill the taphole with mud after tapping. By the time the mud is opened, it has been fired and is very strong, so it takes a long time to open it, and it is hard work.
The method disclosed in No. 13 is adopted.

■The method disclosed in Japanese Patent Publication No. 50-32044 involves press-fitting mud into the tap hole, creating a recess after the mud has been fired to a certain extent, and inserting round Fa steel or a drill into the recess. This is a method in which the condition is maintained until the next taping starts.

■The method disclosed in Japanese Patent Publication No. 57-48613 is to fill the tap hole with mud, and before firing this mud, embed a steel rod there, and make the tip of the steel rod protrude into the furnace, while the rear end In this method, the tap hole is placed in the middle of the furnace wall, and then mud is again filled 11IFa behind the tap hole to close the tap hole.

Problems to be Solved by the Invention In the prior art described in H, firstly, the method of Japanese Patent Publication No. 50-32044 requires that the mud be penetrated with a round steel bar or drill after the firing has progressed to a certain extent. Since this is a method of holding the pig iron at the start, when the taphole is opened, the round steel bars, etc. can be pulled out, but a gap will be created around the round steel bar, and the gas in the furnace will flow into that gap during standby. Accidents have occurred in which hot metal in the furnace has blown out or flowed out of the furnace.

■The method disclosed in Japanese Patent Publication No. 57-48613 embeds a steel rod in the mud before firing the mud, positions the rear end of this steel rod halfway up the furnace wall, and then fills it with mud again. Although it has the advantage of preventing accidents such as gas blowing out of the furnace and hot metal flowing out during standby, as with the technology of Publication No. 50-32044, on the other hand, the rear end of the steel rod is embedded halfway into the furnace wall. Therefore, when opening the taphole, the mud had to be dug up to the rear end of the steel rod with a drill, and then the steel rod had to be melted using an oxygen pipe, which meant long hours of hard labor.

The method and device for closing a blast furnace taphole of the present invention solves the above-mentioned conventional problems, makes it easy to open the taphole during tapping, and prevents the leakage of hot metal from the plugged part due to the in-furnace gas leakage. The purpose is to prevent

Means for Solving the Problems The method of the present invention involves filling the taphole with mud and, before firing the mud, f! Insert the 4 rods into the mud, put the tip of the tJI 4 rod into the furnace, and put the rear end into the furnace! After that, the monolithic refractory is again press-fitted into the furnace from the outer periphery of the steel rod.

In addition, the device fills the tap hole with mud, and before firing the mud, g! ! In the closing device for allowing the rod to enter the mud, a cylindrical steel rod guide material that holds the rear part of the steel rod inside, and a monolithic refractory provided inside the tip of the W4 rod guide material are inserted into the furnace. a pressure equalizing chamber into which the monolithic refractory is press-fitted toward the pressure equalizing chamber; a refractory conduit that guides the monolithic refractory into the pressure equalizing chamber; and a seal packing provided at the tip of the steel rod guide material to prevent the monolithic refractory from escaping during press-fitting. It is characterized by having the following.

A detailed explanation will be given below based on the drawings.

FIG. 1 shows an outline of the device of the present invention, and FIG. 2 shows the following:
FIG. 1 is a schematic diagram illustrating the method of the invention.

In Figure 1, the taphole closing jig (5) is a cylindrical steel bar guide material (51 )
is connected to the rear end of the steel bar guide material (51), and g4
A tap member (52) transmits impact force when the rod (4) enters the mud, and a steel rod (4) is inserted into the furnace from the outer periphery at the tip of the steel rod guide material (51). A pressure equalizing chamber (53) formed in an annular shape for press-fitting inward and a conduit for guiding the monolithic refractory to the pressure equalizing chamber (53) are arranged along the outer periphery of the steel bar guide material (51). At the tip of the refractory conduit (54) and the steel rod guide material (51),
A seal packing (5) is used to prevent the monolithic refractory from escaping when it is press-fitted through the pressure equalization chamber (53)
5), and at the end of the refractory conduit (54) there is a conduit connection part (5) for connecting to the refractory supply part q).
6) is attached. The refractory supply unit (2) includes a high-pressure resistant and sealable tank (72) for storing the monolithic refractory (71), and a high-pressure gas in the upper part of the tank (72). In addition, the monolithic refractories inside the tank (7
2) a high pressure hose (74) connected to the upper part of the tank (72) via a valve (73) for extrusion from the lower end;
A refractory conduit (75) is connected to the lower end of the tank (72) to lead out the monolithic refractory (71) inside and connect it to the refractory conduit (54) on the plugging jig (5) side. It is configured. In this HM, the length of the steel rod guide material (51) is made to match the rear part of the steel rod (4) located outside the furnace, and the strength of the tap member (52) is made to match the steel rod (51) described below. This can be influenced by the impact force of the rod driving jig (6).

Next, the method of the present invention will be described based on FIG.

In FIG. 2, (1) is the furnace wall of the blast furnace, and (2) is the tap hole opened in the furnace wall (1). Now, the taphole (2
A predetermined amount of hot metal is tapped from ), and mud is filled into the tap hole (2) to close the opened tap hole (2). Any method may be used to fill the mud, and a generally known mud gun may be used to fill the mud. The filled mat (3) is fired by heat from inside the furnace and becomes strong. However, in the method of the present invention, before the filled mat (3) is completely fired, it becomes stronger than the thickness of the furnace wall. A long steel rod (4) is advanced into the mud (3).

When the steel rod (4) enters the mud (3), a tap hole closing jig (5) shown in FIG. 1 is used. The length of the steel rod (4) is such that the rear part outside the furnace is connected to the closing jig (5).
The length is limited by the length of the steel rod guide material (51), and the length is such that it passes through the mud (3) of the taphole (3) in a limited state and its tip reaches the inside of the furnace.

As mentioned above, insert the rear part of the sufficiently long steel rod (4) into the steel rod guide material (51) of the tube cover, hold the tip of the steel rod (4) at the center of the tap hole (■), and insert the tap member ( 52) and the end of the steel rod driving jig (6) with a tapping socket! ) (Gl), and the steel rod (4) is moved into the mud (3) by impact.

Seal packing (5) at the tip of the gil guide material (51)
When 5) comes into contact with the mud (3), the steel rod (4) stops striking and the steel rod driving jig (6) is separated.

Next, the refractory conduit (54) and the refractory conduit (75) are connected at the conduit connection part (5G), and the monolithic refractory (71) in the tank (72) is opened by opening the valve (73).
The steel rod (4) entered into the mud (3) is press-fitted into the furnace from the outer periphery.

The pressing force of the monolithic refractory (71) into the furnace is high pressure r
, -y, is determined by the pressure inside (74), and the provision of a seal buffet 7 (55) prevents the monolithic refractory from being wasted.

According to the method of the present invention, the tap hole (■) is blocked by the mud (3), and the steel rod (4) is then introduced into the mud (3) where the mat (3) is to be completely fired. When the steel rod (
4) Position the tip of the steel rod (4) inside the furnace and the rear part of the steel rod (4) outside the furnace using only the correct length, and then enter the steel rod (4) into the mud (3). Steel rod (4) and mat (
3) can be completely sealed by press-fitting the monolithic refractory again.

EXAMPLE A method for closing the taphole of a blast furnace with an internal volume of 1850♂ will be described. First, the frontage taphole after tapping was filled with mud in an amount of 150 kg/TaP per taphole using a mud gun. After filling the mud for 10 minutes, dig a hole of 500 mm in length using an air drill with an outer diameter of 60 mm in the semi-baked mat at the entry position of the steel rod, and then 42 shoes ■φ
Dig 15001 with an awl, then use the prepared f
! Four types of 5541M1 size 38-sφX5500mm steel rods were directed into the furnace through the holes in the mud and were allowed to enter the furnace by impact using the apparatus shown in FIG.

When preparing this W4 dedicated lvt, the length of the steel rod is 5500□
.

The determination is based on the thickness of the furnace wall at the taphole of 10100Os outside the furnace.
000 am, the decision was made based on the prediction of 2500 am on the inside of the furnace. After that, the powdered refractory whose main component is chamots was kneaded with water, and the amount of about 10 kg/tap per tap was w4
The rod was press-fitted into the furnace from the outer periphery to complete the plugging of the tap hole according to the method of the present invention.

As a result of conducting such an experiment 50 times, no hot metal leakage or gas leakage from the taphole occurred.

For reference, the steel type, size, etc. of the steel rod used in the method of the present invention are exactly the same, and the striking approach of the fjI4 rod into the mud in the half-JA-shaped state is also the same as the method of the present invention (the same method is adopted). However, we also tried a method that did not involve press-fitting the monolithic refractory from the outer periphery of the steel rod into the furnace.

As a result, melting or gas leakage occurred 30 times out of 300 tests. In other words, simply driving a steel rod will cause problems with the taphole once in ten times, but according to the method of the present invention, there will be no problems with the Jlj taphole.

Note that the monolithic refractory used in the method of the present invention may be made of anything other than the components shown in the examples, as long as it is a material that is highly heat resistant and fluid. (For example, high alumina refractories.) Effects According to the method of the present invention, when the taphole is closed, after filling with mud, a steel rod longer than the thickness of the furnace wall is inserted into the mud and the tip of the fI4 Since the upper part is located inside the furnace and the rear part is located outside the furnace, the mud is fired uniformly from the inside of the furnace to the outside of the furnace due to heat transfer from the steel rod, resulting in a strong mud and no leakage of hot metal.

■ Since the rear part of the w4 shaft protrudes outside the furnace, it is r! when opened. Opening work is easy because all you have to do is apply vibration to the four rods and pull them out.

■ Also, f! After the four rods enter the mud, the monolithic refractory is again press-fitted into the furnace from the outer periphery of the steel rod, so there is no gap between the outer periphery of the steel rod and the mud. Blowing out of furnace gas or leakage of hot metal from between the mud and the mud can be completely prevented.

It has many effects such as

[Brief explanation of drawings]

FIG. 1 is a schematic diagram, partially in section, of an apparatus for carrying out the method of the invention. FIG. 2 is a schematic diagram illustrating the method of the invention. 1... Furnace wall 2... Tap hole 3...
Mud 4...Steel rod 5...Tapping port closing jig 51...Steel bar guide material 52...Tap member 53...Pressure equalization chamber 5T...4 refractory pipes
55...Seal bag/6...Steel bar driving jig
7... Refractory supply section 71... Monolithic refractory 7
2...Evening 7...High pressure hose

Claims (2)

[Claims] (1) Fill the taphole with mud, and before firing the mud, insert a steel rod longer than the thickness of the furnace wall into the mud, position the tip of the steel rod inside the furnace and the rear end outside the furnace, and then A method of closing a blast furnace tap port in which a monolithic refractory is again press-fitted into the furnace from the outer periphery of the steel rod. (2) A cylindrical steel rod that holds the rear part of the steel rod inside in a closing device that fills the taphole with mud and, before firing the mud, enters the steel rod that is longer than the thickness of the furnace wall. a guide material, a pressure equalization chamber in which the monolithic refractory provided inside the tip of the steel bar guide material is press-fitted into the furnace, and a refractory conduit that guides the monolithic refractory into the pressure equalization chamber; A closure device for a blast furnace tap port, comprising: a seal packing provided at the tip of the steel rod guide material to prevent the monolithic refractory from escaping during press-fitting.