JP6714768B2 - Bird Nest Removal Equipment for Blast Furnace - Google Patents

Description

The present invention relates to a bird nest removing apparatus for a blast furnace, and more particularly to an apparatus for removing bird nests accumulated in the core of a blast furnace.

Generally, in the ironmaking process of a blast furnace, iron ore, which is a raw material of hot metal, and coke of fuel are charged into the blast furnace, and the iron ore is reduced and melted by high-temperature heat and reducing gas generated by burning the coke, This is the process of producing hot metal.
Then, in the operation of blast furnace injection of pulverized coal, as the coke is replaced by pulverized coal, the ore layer thickness relative to the coke layer thickness increases and the amount of coke burned in the lower part of the furnace decreases, resulting in the furnace interior contents. The descent rate of the coke decreases, which increases the residence time of the coke in the blast furnace and also increases the chance of collision between coke particles in the combustion zone. At this time, the coke of fine powder generated by the mechanical wear due to the violent collision reaction is deposited on the coke layer at a certain position in the furnace. That is, the bird nest of the coke packed bed is formed in the core of the blast furnace. Bird nests will accumulate near the combustion zone of the blast furnace core.
Therefore, in order to facilitate the operation of the blast furnace, it is necessary that the reducing gas generated in the lower part can move smoothly to the upper part of the blast furnace. For that purpose, the state of the charged coke packed bed in the furnace must be sound.

The sound state of the coke packed bed in the furnace means that there is a small amount of powder of 3 mm or less between the packed beds. Therefore, if powder of 3 mm or less is removed, a void is secured and the flow of the reducing gas is reduced. Also, it means that the flow of molten metal in the furnace such as hot metal and slag becomes smooth.
In other words, a high-temperature high-pressure countercurrent reactor that produces hot metal by reducing the sinter using the CO gas of the reducing agent obtained by burning the coke charged from the furnace top with the hot air supplied from the lower part. Is. The gas formed in the combustion zone in front of the tuyere must pass through the coke packed bed and diffuse uniformly in the radial and vertical directions of the blast furnace, and no drift should occur.

However, a large amount of powder is generally deposited in the core, which causes a situation in which the gas cannot diffuse to the center of the blast furnace.
In order to remove the fine powder existing in such a powder layer area of 3 mm or less, an attempt has been made in the past to blast and remove this area, but when this method is used, a large amount of powder is generated by the blast. There was a problem. On the other hand, attempts have been made to blow powder ore or low melting point flux containing oxygen through tuyere, but the probability that the injected substance directly acts on the core is low, and rather the ventilation/liquid permeability is rather low. It had the drawback of lowering the temperature and worsening the core situation.

(EN) Provided is a bird nest removing apparatus for a blast furnace, which is capable of effectively removing the bird nest by introducing a capsule containing a melting agent into the bird nest accumulated in the core of the blast furnace to improve the core condition.

The bird nest removing device of the blast furnace is connected to the combustion zone inside the blast furnace and is supplied to the pulverized coal lance that has blown pulverized coal and the bird nest around the combustion zone through the pulverized coal lance to melt and remove the bird nest. A capsule containing a melting agent inside so that it can be removed, and a capsule coal lance that accommodates the capsule and is connected to the end of the pulverized coal lance, and is capable of firing the capsule into a bird nest using high-pressure nitrogen gas. It is characterized by including a body.

The pulverized coal lance preferably further includes a control valve provided between the pulverized coal lance and the high-pressure projectile and capable of controlling the supplied high-pressure nitrogen gas amount.
The pulverized coal lance may further include a blast branch pipe connected to the outside thereof and capable of supplying wind.
The high-pressure projectile may further include a high-pressure gas container connected behind the high-pressure projectile and capable of containing and supplying high-pressure nitrogen gas.

It is preferable that the high-pressure projectile further includes a control valve that is provided between the high-pressure gas container and the high-pressure gas container and is capable of controlling the supplied high-pressure nitrogen gas amount.
The high-pressure projectile may include a loading unit configured to load and fire a large number of capsules, and a lid openably and closably mounted on the loading unit.
The capsule may be formed of a plastic material and have a structure in which a mill-scale melting agent containing water or a hydrogen peroxide solution is contained.

The capsule includes a warhead provided in front of it so that it can be inserted into the bird nest, a cylinder provided behind the warhead and capable of containing a melting agent therein, and provided behind the cylinder to seal the cylinder. It can also include an enabled stopper.
It is preferable that each of the warhead and the plug has a sealing groove formed on its outer peripheral surface, and each of the sealing grooves is provided with a sealing ring so that the cylinder can be sealed.
The cylinder may be connected to another cylinder to form a large capacity cylinder.

The large-capacity cylinder is preferably provided with a flexible connecting portion in the middle thereof and has a structure capable of bending when the bird nest enters.
The capsule may further include a position adjusting plate sandwiched between the warheads and capable of adjusting the advance position of the capsule.
It is preferable that the position adjusting plate is selectively provided on the upper, lower, left and right sides of the warhead, and the capsule arrival point can be adjusted up, down, left and right by adjusting the advancing position of the warhead by the load of the position adjusting plate.

According to this device, by effectively removing the bird nests in the blast furnace core, it is possible to prevent a decrease in the production amount due to a decrease in the air flow generated by the inactivated core, and improve the core condition The furnace condition can be stabilized by lowering the wind pressure.
Further, since the fine powder that forms the bird nest and the melting agent can be reacted to remove the fine powder, it is possible to suppress the phenomenon that the hot air transfer efficiency is reduced due to the fine powder, thereby increasing the production amount. You can

It is the schematic which shows the bird nest removal apparatus of the blast furnace by a present Example. It is the schematic which shows the structure of the bird nest removal apparatus of the blast furnace by a present Example. It is a schematic diagram showing a capsule of a bird nest removal device by this example. It is an exploded view showing a structure of a capsule according to the present embodiment. It is a schematic diagram showing other examples of a capsule by this example. It is a schematic diagram showing a state where a position adjusting plate is provided in the capsule according to the present embodiment.

The terminology used below is merely for reference to particular embodiments and is not intended to limit the invention. As used herein, the singular forms also include the plural unless the context clearly dictates otherwise. As used in the specification, the meaning of "comprising" embodies a particular property, region, integer, step, action, element and/or component, and other particular property, region, integer, step, action, element, It does not exclude the presence or addition of ingredients and/or groups.
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those having ordinary knowledge in the technical field of the present invention can easily implement the present invention. As will be easily understood by those having ordinary skill in the art to which the present invention pertains, the embodiments described below can be modified into various forms without departing from the concept and scope of the present invention. Therefore, the present invention can be implemented in various different forms and is not limited to the embodiments described herein.

FIG. 1 is a schematic view showing a bird nest removing apparatus for a blast furnace according to this embodiment.
FIG. 2 is a schematic view showing the structure of the bird nest removing apparatus for a blast furnace according to this embodiment.
As shown in FIGS. 1 and 2, in order to activate the core in the blast furnace 1, a bird nest removing apparatus for a blast furnace that can effectively remove the bird nest 3 accumulated in the core is disclosed.
In this embodiment, the bird nest removing device of the blast furnace is connected to the combustion zone 2 inside the blast furnace 1, and the pulverized coal lance 10 for injecting pulverized coal and the bird nest 3 around the combustion zone 2 via the pulverized coal lance 10 are connected. And a capsule 20 containing a melting agent inside so that the bird nest 3 can be melted and removed, and the end of the pulverized coal lance 10 that accommodates the capsule 20 is connected and installed, and high pressure nitrogen gas is used. And a high-pressure projectile 30 that enables the capsule 20 to be fired into the bird nest 3.

That is, by firing the capsule 20 using high-pressure nitrogen gas through the high-pressure projectile 30 to the bird nest 3 accumulated in the core, the melting agent in the capsule 20 reacts with the bird nest 3 to cause the bird nest 3 to react. Can be removed.
The pulverized coal lance 10 charged into the combustion zone 2 of the blast furnace 1 further includes a control valve 11 provided between the pulverized coal lance 10 and the high-pressure projectile 30 and capable of controlling the supplied high-pressure nitrogen gas. The lance 10 may further include a blower branch pipe 12 connected to the outside of the lance 10 and capable of supplying wind.

A control valve 11 provided in the pulverized coal lance 10 controls the speed and amount of high-pressure nitrogen gas introduced. Thereby, the firing speed of the capsule 20 can be controlled, and the wind can be more effectively sent to the pulverized coal lance 10 via the blower branch pipe 12 provided outside the pulverized coal lance 10.
The high-pressure projectile 30 for ejecting the capsule 20 to the bird nest 3 further includes a high-pressure gas container 31 connected and installed at the rear of the high-pressure gas container 31 to store and supply high-pressure nitrogen gas. It may further include a control valve 32 that is provided between the control valve 32 and the control valve 32 and that can control the amount of high-pressure nitrogen gas supplied.

The high-pressure projectile 30 is supplied with high-pressure nitrogen gas from a high-pressure gas container 31 provided at the rear of the high-pressure projectile 30 and can eject the capsule 20. The high-pressure projectile 30 is supplied from the high-pressure gas container 31 to the high-pressure projectile 30 via a control valve 32. The amount of gas delivered can be controlled.
In addition, the high-pressure projectile 30 can include a loading unit 33 that can be loaded with a large number of capsules 20 and can be fired, and a lid 34 that can be opened and closed on the loading unit 33. With the structure of 30, the capsules 20 can be fired to the bird nest 3 of the core while a large number of capsules 20 are loaded in the loading part 33, and an openable/closable lid 34 is provided to keep the loading part 33 airtight.

FIG. 3 is a schematic view showing a capsule of the bird nest removing device according to this embodiment.
FIG. 4 is an exploded view showing the structure of the capsule according to this embodiment.
As shown in FIGS. 3 and 4, the capsule 20 is formed of a plastic material and has a structure in which a mill scale melting agent containing water and a hydrogen peroxide solution or an aqueous hydrogen peroxide solution is contained.
In other words, the substance contained in the capsule 20 causes a decomposition exothermic reaction by the bird nest 3 in the blast furnace 1 and the catalytic decomposition reaction function, and the oxygen generated during the decomposition makes it possible to burn the carbon in the fine powder and also melt itself. The bird nest 3 can be removed by the action of washing off the bird nest 3 by the formation of the object.

Further, the structure of the capsule 20 is such that a warhead 21 provided in front of it so that it can be inserted into the bird nest 3, a cylinder 22 provided behind the warhead 21 and capable of containing a melting agent therein, And a plug 23 provided at the rear of the cylinder 22 and adapted to seal the cylinder 22.
The warhead 21 and the plug 23 have sealing grooves 21a and 23a formed on their outer peripheral surfaces, respectively, and sealing rings 21b and 23b are provided in the sealing grooves 21a and 23a, respectively, so that the cylinder 22 can be sealed. ..

By maintaining the airtightness of the cylinder 22 via the warhead 21 and the plug 23, and the sealing rings 21b and 23b coupled thereto, the substance that has entered the cylinder 22 is stably injected into the bird nest 3.
Therefore, since the capsule 20 having the above structure is put into the bird nest 3 of the blast furnace 1 to remove the bird nest 3, the capsule 20 containing the melting agent such as mill scale together with the hydrogen peroxide solution is continuously bird nested. It is possible to eliminate the inactivation of the core by providing a passage for allowing the gas to flow well in the core by charging the powder into the No. 3 and mixing it with the fine powder of the bird nest 3 and removing this fine powder.

FIG. 5 is a schematic view showing another embodiment of the capsule according to this embodiment.
As shown in FIG. 5, the cylinder 22 may be connected to another cylinder to form a large-capacity cylinder 22a, and the large-capacity cylinder 22a is provided with a flexible connecting portion 22b in the middle thereof, and the large-capacity cylinder 22a may be provided with a flexible connecting portion 22b. It is a structure that can be bent when entering.
That is, in the case of the capsule 20, the optimum length of the capsule 20 is about 200 mm for blowing through the pulverized coal lance 10, but the length of the capsule 20 should be increased in order to add more substance. When the large-capacity cylinder 22a is used, there is a problem that the bent pulverized coal lance 10 cannot pass and is clogged. In order to prevent this, by connecting the flexible connecting portion 22b to the middle of the large capacity cylinder 22a, it is possible to design so that the bent portion can smoothly pass.

FIG. 6 is a schematic view showing a state in which the position adjusting plate is provided on the capsule according to the present embodiment.
As shown in FIG. 6, the capsule 20 is sandwiched between the parts of the warhead 21 and further includes a position adjusting plate 24 capable of adjusting the advancing position of the capsule 20. The position adjusting plate 24 selectively moves the upper, lower, left and right sides of the warhead 21. It is a structure which can be adjusted up, down, left and right by adjusting the advancing position of the warhead 21 by the load of the position adjusting plate 24.

That is, when a space is provided in the warhead of the capsule 20 and a position adjusting plate 24 having a diameter equal to or smaller than the diameter of the capsule 20 is sandwiched and charged, the position adjusting plate 24 in which the furnace gas is sandwiched by the warhead 21 while the capsule 20 advances. By acting below, the position of the warhead 21 of the capsule 20 driven into the bird nest 3 is changed so that the arrival point can be adjusted vertically and horizontally.
As a result, after the capsule 20 is mounted on the pulverized coal lance 10, the position of the position adjusting plate 24 sandwiched by the warhead 21 of the capsule 20 is adjusted to the upper and lower sides and the left and right positions to be positioned on the bird nest 3. After moving to the target, the control valve 32 of the high-pressure projectile 30 is opened so that the high-pressure nitrogen gas causes the capsule 20 to be charged into the bird nest 3. Are not concentrated in one location and can be evenly distributed vertically/horizontally.

Therefore, when the fine powder of the bird nest 3 is removed by the melting agent contained in the cylinder 22 of the capsule 20, the ventilation resistance is reduced and the hot air blown through the tuyere is introduced deeply into the core. And the flow of the melt becomes smooth, the flow rate of the blast increases, the wind pressure decreases, and the core is activated.
Therefore, by effectively removing the bird nest 3 of the core of the blast furnace 1, it is possible to prevent a decrease in the production amount due to a decrease in the air flow amount generated in the inactivated core, and improve the blast pressure by improving the core state. By controlling the temperature to be low, the furnace condition can be stabilized, and the fine powder that forms the bird nest 3 can react with the melting agent to remove the fine powder, so that the hot air transfer efficiency is reduced by the fine powder. Since it does not occur, the production amount can be increased.

As described above, although the exemplary embodiments of the present invention have been described with reference to the drawings, various modifications and other embodiments will be made by those skilled in the art. All such modifications and other embodiments are within the scope of the following claims and do not depart from the true spirit and scope of the invention.

1: Blast furnace 2: Combustion zone 3: Bird nest 10: Pulverized coal lance 11: Control valve 12: Blower branch pipe 20: Capsule 21: Warhead 21a, 23a: Sealing groove 21b, 23b: Sealing ring 22: Cylinder 22a: Large Capacity cylinder 22b: Flexible connection part 23: Plug 24: Position adjustment plate 30: High pressure projectile 31: High pressure gas container 32: Control valve 33: Loading part 34: Lid

Claims (10)

Pulverized coal lance connected to the combustion zone inside the blast furnace and blowing pulverized coal,
Capsules supplied to the bird nest around the combustion zone through the pulverized coal lance and having a melting agent inside so that the bird nest can be melted and removed,
Wherein the capsule is connected to and installed on an end portion of the pulverized coal lance while accommodating a saw including a high pressure projectile adapted to be fired capsules bird nest using a high pressure nitrogen gas, and
The capsule has a warhead provided in front of it so that it can be inserted into a bird nest, a cylinder provided behind the warhead and capable of containing a melting agent therein, and provided behind the cylinder. A stopper capable of sealing the cylinder, and a position adjusting plate sandwiched between the warheads and capable of adjusting the advance position of the capsule,
The position adjusting plate is selectively provided on the upper, lower, left and right sides of the warhead, and has a structure capable of adjusting the arrival point of the capsule up, down, left and right by adjusting the traveling position of the warhead by the load of the position adjusting plate. Bird nest removing device for blast furnaces. The blast furnace bird nest removal according to claim 1, wherein the pulverized coal lance further includes a control valve provided between the pulverized coal lance and the high-pressure projectile and capable of controlling the amount of high-pressure nitrogen gas supplied. apparatus. The bird nest removing apparatus of the blast furnace according to claim 2, wherein the pulverized coal lance further includes a blower branch pipe connected to the outside thereof and capable of supplying wind. 2. The bird nest removing device of the blast furnace according to claim 1, wherein the high-pressure projectile further comprises a high-pressure gas container connected to the rear of the high-pressure projectile and capable of containing and supplying high-pressure nitrogen gas. .. The bird nest removal of a blast furnace according to claim 4, wherein the high-pressure projectile further includes a control valve provided between the high-pressure gas container and the high-pressure gas container and capable of controlling the supplied high-pressure nitrogen gas amount. apparatus. The blast furnace according to claim 1, wherein the high-pressure projectile includes a loading unit configured to load and fire a large number of the capsules, and a lid openably and closably mounted on the loading unit. Bird nest removing device. 2. The blast furnace bird according to claim 1, wherein the capsule is formed of a plastic material, and has a structure in which water, a hydrogen peroxide solution, or a mill-scale melting agent containing a hydrogen peroxide solution is contained. Nest removal device. The warhead and plug are sealing groove on its outer peripheral surface, respectively forming the sealing ring is respectively disposed in the sealing groove, according to claim 1, characterized in that a structure capable of sealing the cylinder Bird nest removing device for blast furnace. The bird nest removing apparatus for a blast furnace according to claim 1 , wherein the cylinder may be connected to another cylinder to form a large capacity cylinder. 10. The bird nest removing apparatus for a blast furnace according to claim 9 , wherein the large-capacity cylinder is provided with a flexible connecting portion in the middle thereof and has a structure capable of bending when the bird nest enters.

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