WO2018030585A1

WO2018030585A1 - Apparatus for removing bird's nest in blast furnace

Info

Publication number: WO2018030585A1
Application number: PCT/KR2016/012250
Authority: WO
Inventors: 정진경; 김승보; 김환재; 이승문
Original assignee: 주식회사 포스코
Priority date: 2016-08-11
Filing date: 2016-10-28
Publication date: 2018-02-15
Also published as: CN109563557A; KR101759333B1; JP2019523385A; JP6714768B2; EP3498868A4; EP3498868A1

Abstract

Provided is an apparatus for removing a bird's nest in a blast furnace, which inserts a capsule containing a melting agent into the bird's nest accumulated in the core of the blast furnace so as to effectively remove the bird's nest and improve the core state, the apparatus comprising: a pulverized coal lance which is connected to a race way inside the blast furnace so as to inject pulverized coal therein; the capsule which is supplied to the bird's nest around the race way through the pulverized coal lance and contains the melting agent therein so as to melt and remove the bird's nest; and a high-pressure launcher which is installed to be connected to an end of the pulverized coal lance while accommodating the capsule and is configured to launch the capsule to the bird's nest by using a high-pressure nitrogen gas.

Description

Blast furnace removal device

An apparatus for removing bird nests accumulated in the blast furnace core is disclosed.

Generally, the blast furnace making process is a process of producing molten iron by charging iron ore, which is a raw material for molten iron, and coke, which is fuel, into the blast furnace, and reducing and melting the iron ore by high temperature heat and reducing gas generated by burning the coke.

In the pulverized coal injection blast furnace operation, as the coke is replaced by the pulverized coal, the ore layer thickness increases compared with the coke layer thickness, and thus the combustion amount of the coke is reduced at the lower part of the furnace, and as a result, the descent speed of the coke is lowered. As this increases, there is a greater chance of collision between coke particles in the combustion zone, where fine coke generated by mechanical wear due to a violent collision reaction is deposited in a coke layer at a certain position in the furnace. That is, a bird nest, a coke-filled layer, is formed in the core of the blast furnace. The bird nest is thus accumulated near the combustion zone of the core.

Therefore, in order to facilitate the operation of the blast furnace, the reducing gas generated at the bottom should be able to move smoothly to the upper part of the blast furnace. In order to do this, the condition of the filling layer in the charged furnace coke must be sound.

The sound state of the coke filling layer in the furnace means that -3mm is small between the filling layers. Therefore, if the -3mm is removed, the voids are well secured so that the flow of reducing gas, molten iron and slag flows smoothly. It means.

That is, it is a high-temperature, high-pressure countercurrent reactor that reduces sintered ore and produces molten iron using CO gas, which is a reducing agent obtained by burning coke charged in a furnace with hot air supplied from the bottom. The gas formed in the precooling combustor must pass through the coke packed bed and spread evenly in the radial and vertical direction of the blast furnace and no drift should occur.

However, there is a situation in which a lot of powder is accumulated in the core part and gas cannot penetrate into the center of a blast furnace.

In order to remove the fine powder existing in the -3mm layered zone as described above, it was conventionally attempted to remove such a zone by blasting, but there was a problem in that a large amount of powder generated by the blasting was used. In addition, attempts have been made to remove dust by blowing low-melting fluxes containing ore or oxygen through tuyere, but the aggravation of deterioration due to lower air permeability and lower liquidity due to the low probability of the injected material acting directly on the core. There was this.

The present invention provides a blast furnace bird nest removal device capable of improving the core state by effectively removing the bird nest by injecting a capsule containing a molten agent into the bird nest accumulated in the blast furnace core.

The blast furnace bird nest removal device includes: a pulverized coal lance connected to a combustion zone inside the blast furnace to blow pulverized coal; A capsule containing a melting agent therein so as to be supplied to the bird nest around the combustion zone through the pulverized coal lance to melt and remove the bird nest; And a high pressure projectile installed to be connected to the end of the pulverized coal lance while accommodating the capsule to launch the capsule into a bird nest using a high pressure nitrogen gas.

The pulverized coal lance further includes a control valve that can control the amount of high-pressure nitrogen gas that is installed between the high-pressure projectile and supplied.

The pulverized coal lance further includes a blowing branch pipe which is connected to the outside to supply wind.

The high pressure projectile further includes a high pressure gas container connected to the rear of the high pressure projectile to receive and supply high pressure nitrogen gas.

The high pressure projectile further includes a control valve which controls the amount of high pressure nitrogen gas that is installed between the high pressure gas container and supplied.

The high-pressure projectile may include a loading unit configured to load and fire a plurality of the capsules and a cover installed to open and close the loading unit.

The capsule is formed of a plastic material and has a structure in which a mill scale melter containing water or a hydrogen peroxide solution can be contained therein.

The capsule is installed in front of the warhead and the front of the warhead so that it can be inserted into the bird nest, and a cylinder which can contain the melt in the inside and a stopper installed in the rear of the cylinder to seal the cylinder It may include.

Each of the warhead and the stopper has a sealing groove formed on an outer circumferential surface thereof, and a sealing ring is installed on the sealing groove, respectively, to seal the cylinder.

The cylinder may be connected to another cylinder to constitute a large capacity cylinder.

The large-capacity cylinder has a structure in which a flexible connection part is installed in the middle thereof and can be bent when the bird nest enters.

The capsule further includes a positioning plate that is inserted into the warhead to adjust the progress position of the capsule.

The position control plate is selectively installed on the top, bottom, left and right of the warhead is configured to adjust the arrival point of the capsule up, down, left and right by adjusting the progress position of the warhead through the load of the position control plate.

According to the present apparatus, by effectively removing the bird nest of the blast furnace core, it is possible to prevent the decrease in production due to the decrease in the air flow caused by the inactivated core, and to reduce the blowing pressure in accordance with the improvement of the core state to stabilize the yellowing Can be.

In addition, since the fine powder constituting the bird nest and the melting agent can be removed to remove the fine powder, the phenomenon that the hot air transmission efficiency is not lowered due to the fine powder does not occur, thereby increasing the production amount.

1 is a schematic view showing a bird nest removing apparatus of the blast furnace according to the present embodiment.

2 is a schematic view showing the structure of the blast furnace bird nest removing apparatus according to the present embodiment.

3 is a schematic view showing a capsule of the bird nest removing device according to the present embodiment.

4 is a schematic diagram showing the structure of a capsule according to the present embodiment.

5 is a schematic view showing another embodiment of a capsule according to the present embodiment.

Figure 6 is a schematic diagram showing a state in which the positioning plate is installed in the capsule according to the embodiment.

The terminology used below is merely to refer to specific embodiments, and is not intended to limit the present invention. As used herein, the singular forms “a,” “an,” and “the” include plural forms as well, unless the phrases clearly indicate the opposite. As used herein, the meaning of “comprising” embodies a particular characteristic, region, integer, step, operation, element, and / or component, and other specific characteristics, region, integer, step, operation, element, component, and / or group. It does not exclude the presence or addition of.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art can easily understand, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. Accordingly, the present invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

1 and 2, there is disclosed a blast furnace bud nest removal apparatus capable of effectively removing the bud nest 3 accumulated in the core in order to activate the core in the blast furnace (1).

In the present embodiment, the bird nest removing device of the blast furnace is connected to the combustion table 2 inside the blast furnace 1 to pulverize pulverized coal to blow the pulverized coal, and the combustion table 2 through the pulverized coal lance 10. End portion of the pulverized coal lance 10 while accommodating the capsule 20 and a capsule 20 containing a melt therein so as to be supplied to the surrounding bird nest 3 to melt and remove the bird nest 3. It may include a high-pressure projectile 30 is installed to be connected to the high-pressure nitrogen gas to shoot the capsule 20 to the bird nest (3).

That is, the capsule 20 is fired by using the high pressure nitrogen gas through the high pressure projectile 30 to the bud nest 3 piled up in the core so that the melt agent and the bud nest 3 react in the capsule 20. The bird nest 3 can be removed.

In addition, the pulverized coal lance 10 introduced into the combustion table 2 of the blast furnace 1 has a control valve 11 that can control the amount of high-pressure nitrogen gas that is installed between the high-pressure projectile 30 and supplied. Further comprising, the pulverized coal lance 10 may be further provided with a blowing branch pipe 12 which is connected to the outside to supply wind.

By controlling the rate and the amount of high-pressure nitrogen gas is injected through the control valve 11 installed in the pulverized coal lance 10, it is possible to control the firing speed of the capsule 20, the pulverized coal lance 10 It is possible to send the wind to the pulverized coal lance 10 more effectively through the blowing branch pipe 12 is installed on the outside.

In addition, the high pressure projectile 30 for launching the capsule 20 to the bird nest 3 further includes a high pressure gas container 31 connected to the rear thereof to accommodate and supply high pressure nitrogen gas. It may further include a control valve 32 that can be installed between the high-pressure gas container 31 to control the amount of high-pressure nitrogen gas supplied.

The high pressure projectile 30 may receive the high pressure nitrogen gas from the high pressure gas container 31 installed at the rear thereof to launch the capsule 20, and the high pressure gas container may be provided through the control valve 32. 31 can control the amount of gas supplied to the high pressure projectile 30.

In addition, the high pressure projectile 30 may include a loading part 33 configured to load and fire a plurality of the capsules 20 and a cover 34 installed to open and close the loading part 33. Bar, through the structure of the high-pressure projectile 30 can load the capsule 20 to the bird nest (3) of the core in the state of loading a plurality of capsules 20 in the loading section 33, the field Opening and closing the cover 34 may be installed for the airtight of the whole 33.

As shown in Figure 3 and 4, the capsule 20 is formed of a plastic material is a structure that can contain a mill scale melt containing water and hydrogen peroxide solution or hydrogen peroxide solution therein.

That is, decomposition exothermic reaction is possible by the catalytic decomposition reaction function with the bird nest 3 in the blast furnace 1 by the substance contained in the capsule 20, and combustion of carbon in fine powder is possible by oxygen generated during decomposition. In addition, it can be removed by the action of washing the bird nest (3) by the formation of its own melt.

In addition, the structure of the capsule 20 has a warhead 21 installed in front of it so that it can be inserted into the bird nest (3), and a cylinder that can be installed in the rear of the warhead 21 to contain the melt agent therein And a stopper 23 installed at the rear of the cylinder 22 to seal the cylinder 22.

The warhead 21 and the stopper 23 are formed with sealing grooves 21a and 23a on their outer circumferential surfaces, and sealing rings 21b and 23b are respectively installed in the sealing grooves 21a and 23a. The cylinder 22 can be sealed.

By maintaining the airtightness of the cylinder 22 through the warhead 21 and the stopper 23 and the sealing rings 21b and 23b coupled thereto, the material contained in the cylinder 22 is stably in the bird nest 3. Allow input.

Therefore, the capsule 20 having the above structure is introduced into the bud nest 3 of the blast furnace 1 to remove the bud nest 3, and the hydrogen peroxide solution together with the molten agent such as the mill scale is contained. The capsule 20 is continuously introduced into the bird nest 3 and mixed with the fine powder formed by the bird nest 3 to remove the fine powder, thereby creating a passage for the gas to flow well in the core, thereby eliminating the inactivation of the core. have.

As illustrated in FIG. 5, the cylinder 22 may be connected to another cylinder to constitute a large capacity cylinder 22a, and the large capacity cylinder 22a may have a flexible connection part 22b installed therebetween. It is a structure that can be bent upon entry of the nest (3).

That is, in the case of the capsule 20 is about 200mm is the length of the capsule 20 is optimal for blowing through the pulverized coal lance 10, in order to inject more material by increasing the length of the capsule 20 the large-capacity cylinder In the case of using (22a), it is expected to be blocked by passing through the pulverized pulverized coal lance 10, so that the flexible connection part 22b is connected smoothly to the middle of the large-capacity cylinder 22a in order to prevent this. Can be designed to pass.

As shown in FIG. 6, the capsule 20 further includes a positioning plate 24 that is inserted into the warhead 21 and adjusts a traveling position of the capsule 20, and the positioning plate 24 includes the above-described positioning plate 24. It is selectively installed on the top, bottom, left and right of the warhead 21 is configured to adjust the arrival position of the warhead 21 through the load of the positioning plate 24 to adjust the arrival point of the capsule 20 up, down, left and right.

That is, in the case where a gap is formed in the warhead of the capsule 20 and the positioning plate 24 is inserted into or smaller than the diameter of the capsule 20, the capsule 20 proceeds to the furnace gas 21 to the warhead 21. The position of the warhead 21 of the capsule 20 lodged in the bird nest 3 is changed by acting under the fitted positioning plate 24 so that the position of arrival can be adjusted up, down, left and right.

Accordingly, after the capsule 20 is mounted on the pulverized coal lance 10, the position of the positioning plate 24 fitted to the warhead 21 of the capsule 20 is adjusted up and down and to the left and right positions so that the bird nest 3 After moving to the target to be located in, the control valve 32 of the high-pressure projectile 30 is opened so that the capsule 20 is introduced into the bird nest 3 by the high-pressure nitrogen gas, the capsule ( Melt-generating material such as mill scale contained in 20) is concentrated in one place and distributed evenly up, down, left and right without being sprayed.

Therefore, when the fine powder of the bird nest 3 is removed by the melt agent contained in the cylinder 22 of the capsule 20, the air permeation resistance is reduced and the hot air blown through the tuyere is introduced deep into the core, the gas and the melt The smooth flow of air increases the blow flow rate and reduces the wind pressure, which activates the core.

Therefore, by effectively removing the bird nest (3) of the blast furnace (1), it is possible to prevent a decrease in production due to the decrease in the air flow caused by the inactivated core, and to reduce the blowing pressure in accordance with the improvement of the core state to reduce the Since the fine powder can be stabilized and the fine powder constituting the bird nest 3 and the melting agent can be removed to remove the fine powder, a phenomenon in which the hot air transfer efficiency is not lowered due to the fine powder does not occur, thereby increasing the yield.

While the exemplary embodiments of the invention have been illustrated and described as described above, various modifications and other embodiments may be made by those skilled in the art. Such modifications and other embodiments are all considered and included in the appended claims, without departing from the true spirit and scope of the invention.

Claims

Pulverized coal lance connected to the combustion zone inside the blast furnace to blow the pulverized coal;

A capsule containing a melting agent therein so as to be supplied to the bird nest around the combustion zone through the pulverized coal lance to melt and remove the bird nest; And

And a high-pressure projectile installed to be connected to the end of the pulverized coal lance while accommodating the capsule so as to launch the capsule into a bird nest using high-pressure nitrogen gas.
The method of claim 1,

The pulverized coal lance is a blast furnace bud nest removal device further comprises a control valve for controlling the amount of high-pressure nitrogen gas is installed between the high-pressure projectile and supplied.
The method of claim 2,

The pulverized coal lance is connected to the outside of the blast furnace bud nest removal device further comprises a blowing branch pipe for supplying wind.
The method of claim 1,

The high-pressure projectile is connected to the rear of the blast furnace bud nest removal device further comprises a high-pressure gas container to accommodate and supply high-pressure nitrogen gas.
The method of claim 4, wherein

The high pressure projectile further comprises a control valve for controlling the amount of high-pressure nitrogen gas is installed between the high-pressure gas vessel and the blast furnace bud nest removal device.
The method of claim 1,

The high-pressure projectile is a blast furnace bud nest removal device including a loading portion to enable the loading and firing of the plurality of capsules and a cover installed to open and close the loading portion.
The method of claim 1,

The capsule is molded of a plastic material and the blast furnace bud nest removal device having a structure that can be contained therein mill scale melt containing water or hydrogen peroxide solution or hydrogen peroxide solution.
The method of claim 7, wherein

The capsule is installed in front of the warhead and the front of the warhead so that it can be inserted into the bird nest, and a cylinder which can contain the melt in the inside and a stopper installed in the rear of the cylinder to seal the cylinder Bird nest removal device of blast furnace containing.
The method of claim 8,

The warhead and the stopper is formed in each of the outer peripheral surface sealing groove, the sealing ring is provided in each of the sealing groove is a blast furnace bud nest removal device of the structure that can seal the cylinder.
The method of claim 8,

The cylinder is connected to another cylinder to remove the blast furnace bud nesting device that can form a large capacity cylinder.
The method of claim 10,

The large-capacity cylinder is a blast furnace bird nest removal device having a structure in which a flexible connection is installed in the middle can be bent when the bird nest enters.
The method of claim 8,

The capsule is blast furnace bud nest removal device further comprises a positioning plate to be inserted into the warhead to adjust the progress position of the capsule.
The method of claim 12,

The positioning plate is selectively installed on the top, bottom, left and right of the warhead is adjusted to the position of the warhead through the load of the position adjustment plate of the blast furnace bud nest removal device of the structure to adjust the arrival point of the capsule up, down, left and right.