KR101650707B1 - Repairing material spraying apparatus for furnace inner wall - Google Patents

Repairing material spraying apparatus for furnace inner wall Download PDF

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Publication number
KR101650707B1
KR101650707B1 KR1020150172234A KR20150172234A KR101650707B1 KR 101650707 B1 KR101650707 B1 KR 101650707B1 KR 1020150172234 A KR1020150172234 A KR 1020150172234A KR 20150172234 A KR20150172234 A KR 20150172234A KR 101650707 B1 KR101650707 B1 KR 101650707B1
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KR
South Korea
Prior art keywords
nose
tube
rotary
nose portion
repair material
Prior art date
Application number
KR1020150172234A
Other languages
Korean (ko)
Inventor
최병철
박월성
이영주
Original Assignee
주식회사 포스코
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Priority to KR1020150172234A priority Critical patent/KR101650707B1/en
Application granted granted Critical
Publication of KR101650707B1 publication Critical patent/KR101650707B1/en

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/04—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/04—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet
    • B05B3/0409—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet with moving, e.g. rotating, outlet elements
    • B05B3/0418—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet with moving, e.g. rotating, outlet elements comprising a liquid driven rotor, e.g. a turbine
    • B05B3/0422—Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet with moving, e.g. rotating, outlet elements comprising a liquid driven rotor, e.g. a turbine with rotating outlet elements
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/04—Blast furnaces with special refractories
    • C21B7/06—Linings for furnaces

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Abstract

The present invention relates to a rotary nozzle including a rotary nose unit and a repair material spraying device for a worn-out blast furnace wall including the same. The spraying apparatus of the invention is capable of improving a performance of attachment by preventing a repair material from specifically cohering in a nose part of a spraying apparatus, reducing a loss of rebound of a repair material by including a rotary nose unit therein. The rotary nozzle of the invention comprises: a first pipe supplying a repair material; a second pipe connected to the first pipe, supplying an accelerating agent; a nose fixing unit fixating a rotatory nose unit to be able to rotate, including a pneumatic path connected to a pneumatic pipe; and a rotatory nose unit fixated on the nose fixing unit to be able to rotate, including at least one or more rotors.

Description

Technical Field [0001] The present invention relates to a rotary nozzle body, and a repairing material spraying apparatus for furnace inner wall,

The present invention relates to a rotary nozzle body and a blast furnace wall maintenance material spraying apparatus including the same, and more particularly, to a spray nozzle for spraying a spray nozzle of a spray nozzle, And a blast furnace wall maintenance material injection device including such a rotation nozzle body.

Generally, the blast furnace is charged with coke as fuel and iron ore as a raw material through the inlet of the furnace, blowing hot air through a tuyere at the bottom of the furnace to burn the coke to produce heat and reducing gas, The iron ores in the furnace are reduced and melted to produce molten iron and slag, and the molten iron is configured to be discharged through an outlet at the lower part of the furnace, thereby enabling continuous production of molten iron.

The main body structure of the blast furnace is made of refractory material with high strength which can withstand high temperature and gas, and the inside of the furnace is cooled by inserting a cooling bed between the burned and refractory materials, And to protect the scum.

However, as the blast furnace ages increase, the damage and wear of the refractories progress, and / or the protrusion of the cooling zone becomes severe, the amount of the cooling half damage increases, Therefore, in order to overcome such a problem, it is necessary to repair the furnace wall, and the furnace wall is usually remodeled every six months in consideration of the fact that the castable refractory has a service life of 5 to 6 months.

As a method for repairing the furnace wall, methods such as pressurizing the furnace body and spraying the furnace wall are widely used.

The impregnation of the furnace body is performed in a state in which the charge is filled in the furnace, and the refuse of the damaged portion is poured into the furnace through the hole from the outside of the furnace through the hole and the refractory of the damaged furnace body is repaired Method.

In addition, a method of spraying and repairing the furnace wall is a method of reducing the amount of the charge in the blast furnace to a site to be furnace walled and / or tuyere, and allowing the nozzle body connected to the wire rope of the manipulator to enter the furnace, And then the repair material is sprayed onto the refractory surface formed on the inner surface of the furnace wall through the nozzle portion connected to the nozzle body. At this time, the maintenance material stored in the reservoir provided outside the blast furnace is supplied to the nozzle unit through the feed gun and the supply hose. The maintenance material is attached to the inner wall of the blast furnace by concentrically spraying the repair material made of refractory material (castable) during the operation of spraying the repair material to the refractory side through the nozzle part, Thereby forming a solid refractory layer.

As described above, the method of spraying and repairing the furnace wall has various advantages such as easy construction and maintenance without completely stopping the blast furnace. However, the maintenance material sprayed through the nozzle portion during the repair work And the rebound loss can form a certain layer inside the furnace. Such a rebound loss layer can promote the deposit growth inside the furnace, , Which may interfere with the normal flow of the gas stream and / or interfere with the melting of the charge in the blast furnace, thereby acting as a long-term instability factor of the operation. Also, if the long-term high-temperature operation is continued to remove the rebound loss layer after the repair work of the furnace wall, the refractory of the blast furnace is damaged and the silicon in the charcoal is elevated.

Further, if the amount of the rebound loss layer due to the maintenance material falling off without being attached to the wall after the injection is relatively increased, the loss of the material cost is increased, and when the increase in the operating capacity, the normal operation return is delayed .

Korean Unexamined Patent Publication No. 2002-0055189 (Jul. 2002) Korean Patent Laid-Open Publication No. 2002-0048559 (June 24, 2002)

Disclosure of the Invention The present invention has been conceived to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a spray nozzle, And an object of the present invention is to provide a blast furnace wall maintenance material spraying device including such a rotating nozzle body.

According to an aspect of the present invention, there is provided a dispenser comprising: a first body for supplying a first jet; A second tube connected to the first tube for supplying a second jet; A nose fixing portion to which the first tube is connected; And a rotary nose portion rotatably fixed to the nose fixing portion and including at least one or more rotor blades.

The nose fixing part may further include a pneumatic path connected to the pneumatic tube.

The rotor blade may preferably be included within a range of 2 to 8.

At least one bearing may be further included between the nose fixing portion and the rotation nose portion.

The first tube may further include a separation tube extending from an end of the second tube connected to the first tube to an end of the first tube.

The inner wall of the rotary nose portion may further include a stirring blade.

The stirring ripe may be fixed to an inclined portion whose inner diameter of the rotary nose portion is narrowed toward the end portion in the longitudinal direction of the rotary nose portion.

According to another aspect of the present invention, there is provided a rotary nozzle apparatus comprising: the rotary nozzle body, wherein the first jet is made of a repair material, and the second jet is provided in a quick-setting vessel, .

According to the blast furnace wall repair material spraying apparatus of the present invention, it is possible to prevent the flocculation of the spraying device, particularly the nose portion, of the maintenance material at the time of spraying of the repair material, and reduce the rebound loss of the repair material, So that the repair of the furnace wall can be ensured and at the same time, the steady operation of the blast furnace can be performed quickly, thereby improving the productivity of the molten iron.

1 is a side sectional view schematically showing a state in which a blast furnace wall repair material spraying device is located in a blast furnace.
2 is a side cross-sectional view schematically showing one specific example of a conventional nozzle unit constituting a blast furnace wall repair material spraying apparatus.
3 is a side sectional view schematically showing one embodiment of a blast furnace wall repair material spraying device including a rotating nozzle body having a rotating nose portion according to the present invention constituting a blast furnace wall repair material spraying device.
4 is an exploded perspective view showing the inside of a rotating nose portion in the rotating nozzle body of Fig. 3;

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in Figs. 3 and 4, the rotary nozzle body 11 according to one aspect of the present invention includes a first tube body 12 for supplying a first jet; A second tubular body (13) connected to the first tubular body (12) for supplying a second jet; A nose fixing part 15 to which the first tube 12 is connected; And a rotary nose portion (16) rotatably fixed to the nose fixing portion (15) and including at least one rotor blade (161). In this case, the first jet may be a repair material, and the second jet may be a rapid dispenser.

The first tubular body 12 functions to supply the maintenance material A and at the same time functions as the main body of the rotary nozzle body 11 according to the present invention. Lt; / RTI >

The repair material A may be preferably castable. The castable or castable refractory is composed of refractory aggregates such as alumina, magnesia, chromia, and a matrix composed of refractory fine particles and an inorganic binder such as alumina cement. The fluidity and molding I have sex. In addition, ultrafine inorganic admixtures such as silica fume and reactive alumina, which can diversify the particle size distribution of the dispersed part, can be incorporated into the fine part for improving densification and fluidity, An organic admixture such as a plastisizer, an air entraining agent, or a set modifier may be added. The castable is mixed according to the composition of the mortar mixer and refractory, and then molded into a refractory shape. Particularly, in the case of spraying through the nozzle and adhering to the wall of the furnace as in the present invention, it is preferable that the rapid dispenser is further mixed with the repair material immediately before and / or after the spraying of the repair material. The rapid dispenser facilitates the rapid joining and / or assembly of the repair material, thereby enhancing the adhesion rate attached to the wall immediately after the spraying, thereby smoothly performing the repair of the furnace wall.

The second tubular body 13 is connected to the first tubular body 12 to perform a function of supplying acupuncture (B).

The quick-setting admixture B functions to smoothly perform the repair of the furnace walls by rapidly attaching and / or assembling the repair material A to increase the adhesion rate attached to the wall immediately after spraying, And a synthetic resin.

The nose fixing part 15 includes a pneumatic path 151 which rotatably fixes the rotary nose part 16 and is connected to the pneumatic pipe 152. The nose fixing part 15 is fixedly connected to the first tubular body 12 functioning as the main body of the nozzle and more preferably to the end of the first tubular body 12, 12 so that the rotary nose portion 16 is rotatably fixed.

Preferably, at least one bearing, preferably between the nose fixing portion 15 and the rotary nose portion 16, preferably between the first tube 12 and the rotary nose portion 16, A first bearing 153 oriented horizontally and fixed between an outer surface of the nose fixing portion 15 and an inner surface of the rotary nose portion 16 and a second bearing 153 fixed to the first tubular body 12 and the rotary nose portion 16, And a second bearing 154 oriented perpendicular to the longitudinal axis of the nose fixing portion 15 and fixed between the outer bottom surface of the nose fixing portion 15 and the inner bottom surface of the rotary nose portion 16, Even when an external force is applied in an arbitrary direction between the nose fixing portion 15 and the rotary nose portion 16 by the arrangement of the first bearing 153 and the second bearing 154, 15, it is possible to freely rotate the rotary nose portion 16, It is not intended that the invention be limited thereto and that there may be additional bearings at any other location where they are interfaced with each other, for example between the nose fixing portion 15 and the rotating nose portion 16 It should be understood that it can be installed.

4, the rotating nose portion 16 is rotatably fixed to the nose fixing portion 15 and includes at least one or more rotor blades 161. [ The rotor blade 161 is installed on the inner surface of the rotary nose portion 16, preferably adjacent to the nose fixing portion 15 to which the rotary nose portion 16 is rotatably fixed, (Not shown) applied by pneumatic pressure, i.e., pressurized air and / or pressurized nitrogen gas introduced via a pneumatic tube 152 connected to the pneumatic path 151 of the fixed portion 15 and a pneumatic path 151 connected thereto And functions to rotate the rotary nose portion 16 by air pressure. For this, the rotor blade 161 is preferably inserted through a small gap (5 to 15 mm) formed between the nose fixing portion 15 and the rotary nose portion 16 through the pneumatic path 151, Preferably at a predetermined angle within a range of 10 to 90 degrees with respect to the gap so as to receive the application of the pneumatic pressure through the gap so that the application of the pneumatic pressure introduced through the gap can be efficiently received And by this pressure, the rotating nose portion 16 can function to provide power that can be rotated with respect to the nose fixing portion 15. [ For this purpose, the rotor blade 161 may be included within a range of preferably 2 to 8. If the gap is less than 5 mm, the gap may be too small to apply a sufficient air pressure to effectively rotate the rotary nose portion 16. On the other hand, when the distance exceeds 15 mm, There is a problem that the clearance between the nose portion 16 and the nose portion 16 is too large and the rotating nose portion 16 is stably fixed and is not easily rotated stably. If the angle of the rotor blade 161 is out of the range of 10 to 90 degrees, it may be difficult to efficiently apply the air pressure and the rotation nose portion 16 may be difficult to rotate. The number of the rotor blades 161 is not limited, but may be preferably within a range of 2 to 8, more preferably 3 to 6, and most preferably 4 to 5. If the number of the rotor blades 161 is less than two, there may be a problem that the rotating nose portion 16 is difficult to be stably rotated. On the contrary, when the number of the rotor blades 161 is more than eight, There is a problem that the normal spraying of the repairing material becomes difficult. The use of the rotating nose portion 16 by employing the above-described rotor blade 161 makes it possible to prevent sedimentation and accumulation of metal oxides as fine particles in the nozzle, particularly in the nose portion, It is possible to reduce the rebound loss of the spray material when spraying the repair material.

The first tube 12 may further include a separation tube 14 extending from the end of the second tube 13 connected to the first tube 12 to the end of the first tube 12, , The separation pipe 14 prevents the mixing of the repair material A and the quick-setting material B to the end of the first tube body 12 so that the repair material A is prevented from being mixed in at least the rotating nozzle body 11 It is possible to perform a function of preventing the sheet from coming off.

The stirring nose 162 may be formed on the inner wall of the rotating nose portion 16 so that the inner diameter of the rotating nose portion 16 is preferably longer than the length of the rotating nose portion 16 To an end portion thereof in the direction of the arrow Y. The stirring wing 162 is rotated by the rotation of the rotatable nose portion 16 so that the maintenance material A and the quick-setting material B are sprayed through the rotary nozzle body 11 according to the present invention. ) And the quick-setting admixture (B), thereby facilitating the maintenance of the furnace wall by effectively allowing the repair material (A) to adhere to the furnace wall. The rotary nose portion 16 may include an inclined portion y that narrows toward the end portion in the longitudinal direction and a linear portion x that does not narrow in the longitudinal direction. The number of the stirring wings 162 is not limited to the same and / or similar to that of the rotor blades 161, but is preferably 2 to 8, more preferably 3 to 6, It can be included within five ranges. If the number of the agitating wings 162 is less than 2, the function of assisting the mixing of the repair material and quick-setting agent in the rotary nose portion 16 is not sufficient, so that there is a problem that mixing of the repair material and quick- On the other hand, if the number of the rotation nose portions 16 exceeds 8, the load applied to the rotary nose portion 16 may be too large to normally spray the repairing material.

According to another aspect of the present invention, there is provided a blast furnace wall maintenance material spraying apparatus including the rotating nozzle body (11). That is, the rotary nozzle body 11 having the above-described configuration can be fixed to the end portion of the nozzle unit 7 fixed to the nozzle body 6 as shown in FIG. 1, and the nozzle body 6 It is possible to repair the inner wall of the blast furnace by injecting the repairing material or the like by the manipulator 9 while hanging the wire 8 to be injected into the blast furnace and into the blast furnace. In Fig. 1, reference numeral 1 denotes a blast furnace, reference numeral 2 denotes an iron core constituting the blast furnace, reference numeral 3 denotes a furnace wall made of refractory, reference numeral 4 denotes a tuyere, and reference numeral 5 denotes an outlet.

(Example) using a blast furnace wall repair material spraying device including the rotating nozzle body 11 according to the present invention and a nose portion 74 fixed in place of the rotating nose portion as an example, as shown in FIG. 2 A main body 71 for supplying the maintenance material A; A side pipe body 72 connected to the main pipe body 71 for supplying the quick-setting fluid B; A separation pipe 73 fixed in the main pipe 71 and extending from the end of the pipe 72 connected to the main pipe 71 to the end of the main pipe 71; And a conventional nozzle body 7 including a nozzle unit 74 connected to the main pipe body 71. The same was applied to the same furnace wall wall material spraying apparatus at the same pressure (about 140 kg / cm 2) Table 1 shows the results of a comparative test in which the amount of rebound loss is measured through a test in which the same injection material and the same rapid setting agent are sprayed in the same amount.

division
Comparative Example Example The third blast furnace Fifth blast furnace The third blast furnace The second blast furnace Fifth blast furnace 4th blast furnace Time of experiment July 2014 December 2014 January 2015 February 2015 April 2015 June 2015 rebound
Loss 19.5% 16.6% 12.0% 11.2% 12.2% 14.1%

As shown in Table 1, according to the present invention, by applying the rotating nozzle body including the rotating nose portion, it is possible to significantly reduce the amount of rebound loss generated in the maintenance material, compared with the use of the nozzle body including the conventional fixed nose portion I could confirm.

1: Blast Furnace 2: Evil
3: Roof wall 4:
5: outlet 6: nozzle body
7: nozzle unit 71:
72: side tube 73: separation tube
74: Nosubu
8: wire 9: manipulator
11: Rotating nozzle body 12: First tube
13: Second tube body 14: Separation tube
15: Nose fixing part 151: Pneumatic
152: Pneumatic tube 153: First bearing
154: Second bearing
16: Rotating nose portion 161: Rotor blade
162: stirring strength
A: Repair material B:
x: straight line part y:

Claims (8)

A first tubular body for supplying a first jet;
A second tube connected to the first tube for supplying a second jet;
A nose fixing portion to which the first tube is connected; And
A rotating nose portion rotatably fixed to the nose fixing portion and including at least one rotor blade;
And a plurality of rotatable nozzle bodies. The method according to claim 1,
Wherein the nose fixing part further includes a pneumatic path connected to the pneumatic tube, The method according to claim 1,
Wherein the rotor blade is included within a range of 2 to 8 rotations. The method according to claim 1,
Wherein at least one bearing is further provided between the nose fixing part and the rotation nose part. The method according to claim 1,
Further comprising a separation tube extending from the end of the second tube body connected to the first tube body to the end of the first tube body in the first tube body. The method according to claim 1,
And a stirring blade is further included in an inner wall of the rotary nose portion. The method according to claim 6,
Wherein the stirring wing is fixed to an inclined portion whose inner diameter of the rotating nose portion is narrowed toward the end in the longitudinal direction of the rotating nose portion. A rotary dispenser as set forth in any one of claims 1 to 7, wherein the first jet is made of a repair material, the second jet is provided as a quick-setting dispenser, Wherein the blast furnace wall is provided for maintenance.
KR1020150172234A 2015-12-04 2015-12-04 Repairing material spraying apparatus for furnace inner wall KR101650707B1 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
KR1020150172234A KR101650707B1 (en) 2015-12-04 2015-12-04 Repairing material spraying apparatus for furnace inner wall

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KR101650707B1 true KR101650707B1 (en) 2016-08-24

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0995718A (en) * 1995-09-29 1997-04-08 Kawasaki Steel Corp Device for working iron tapping runner
KR20020048559A (en) 2000-12-18 2002-06-24 이구택 apparatus for spraying castable to wall of furnace
KR20020055189A (en) 2000-12-28 2002-07-08 이구택 Spray apparatus for repairing the wall of the furnace

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0995718A (en) * 1995-09-29 1997-04-08 Kawasaki Steel Corp Device for working iron tapping runner
KR20020048559A (en) 2000-12-18 2002-06-24 이구택 apparatus for spraying castable to wall of furnace
KR20020055189A (en) 2000-12-28 2002-07-08 이구택 Spray apparatus for repairing the wall of the furnace

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