KR101587742B1 - Apparatus and method for increasing fluid velocity of air blowing - Google Patents

Apparatus and method for increasing fluid velocity of air blowing Download PDF

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Publication number
KR101587742B1
KR101587742B1 KR1020140172099A KR20140172099A KR101587742B1 KR 101587742 B1 KR101587742 B1 KR 101587742B1 KR 1020140172099 A KR1020140172099 A KR 1020140172099A KR 20140172099 A KR20140172099 A KR 20140172099A KR 101587742 B1 KR101587742 B1 KR 101587742B1
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South Korea
Prior art keywords
flow rate
flow
hot air
air
tuyere
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KR1020140172099A
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Korean (ko)
Inventor
이준수
이희근
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주식회사 포스코
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C21B7/163—Blowpipe assembly
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C21B7/166—Tuyere replacement apparatus

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Iron (AREA)

Abstract

Disclosed is a device to increase a fluid velocity of an air blast. To achieve this purpose, the present invention comprises: a flux control part increasing fluid velocity by taking hot air through a mouth smaller than a diameter of a blast inlet when air volume is low; and a vibrating part formed at least one part of a flux control part such that the air volume of the hot air taken through the blast inlet is secured by applying vibrations to the flux control part to induce a loss of the flux control part.

Description

[0001] APPARATUS AND METHOD FOR INCREASING FLUID VELOCITY OF AIR BLOWING [0002]

More particularly, the present invention relates to an apparatus and method for increasing the flow rate of a blowing air, and more particularly, to a method for increasing the flow rate of blowing air at an initial stage of blowing through a flow rate adjusting unit having a small- And an air flow amount is secured by allowing hot air to flow into the blast furnace through the tuyere, and a method thereof.

Generally, in the blast furnace process, hot air is blown into the blast furnace through blast furnace during operation to reduce and dissolve sintered ores.

In such a blast furnace operation, it is necessary to control the flow rate of hot air flowing through the tuyere. In order to control the flow rate of hot air in this way, in order to vary the tuyere flow rate at the same air volume, the flow rate of the tuyere . In the past, a wind should be applied to adjust the size of the wind aperture.

The reason why the velocity of the tidal flow is needed in the blast furnace is as follows.

When the temperature of the furnace part during the blast furnace operation is lowered due to the deterioration of the quality of the furnace or raw material or the long term break for repair purposes, the core is inactivated.

When such inactivation of the core occurs, fluctuation of the gas flow in the blast furnace is severe and aging deteriorates, and high production and high efficiency operation can not be performed.

Thus, by increasing the flow rate of the hot air through the blast tuyere, the deep core of the furnace can be blown into the core (deep core) to transfer the calories to the core.

In addition, in case of cold water or sulphurous sludge, only a few tuyere is used to operate the low air volume. In this case, it is important to secure the tidal flow rate in the initial blowing.

If the tidal flow velocity is low, tornado damage often occurs, and it takes a lot of time to restore the operation because the tidal wind is required to change the tornado.

On the other hand, in the early stage of blowing hot air, there is not a lot of air volume, the pressure rises due to the charge accumulated in the furnace, and when the air volume is excessive, there is a danger of blowing and the amount of hot air can not be increased sharply.

Therefore, it is necessary to increase the wind flow rate by narrowing the wind aperture so that hot air can be blown into the core even at a low air flow rate at the initial stage of blowing. When the heat of the blast furnace is sufficiently secured, It is important to secure.

At this time, if the initial air flow rate is low, air can not flow into the blast furnace evenly, and there is a risk of spoilage loss due to non-uniform melting of the charge.

In the present invention, the flow rate of the blowing air is increased by introducing the hot air into the blast furnace through the flow rate adjusting unit smaller than the diameter of the tongue at the initial stage of blowing, and after the heat is sufficiently secured in the blast furnace, The present invention has an object to provide a blowing flow rate increasing device capable of flowing air into the blast furnace and securing the air flow rate. Especially, since the blowing of air into the blast furnace is started, There is a technical feature to form a piezoelectric material which can dissipate the flow rate control part itself through external power supply to a part of the flow rate control part in order to solve a problem that can not be solved.

As a related art related to this, Korean Patent Laid-Open Publication No. 2002-0040505 entitled " Method of Controlling Tidal Flow Velocity According to the Inlet Blowing Ratio ", Korean Patent Laid-Open Publication No. 2003-0048818 entitled " Although the technical idea of increasing the flow velocity of the air flow by narrowing the inner diameter of the initial tuyeres in the case of the above-mentioned invention is disclosed in the publication of "Publication No. 2013-0063737", the flow velocity of the air flow and the heat inside the blast furnace It is simpler to blow off the original blowing device by eliminating or eliminating the device for increasing the blowing flow rate after securing the blower, and it has a limitation that it can not start the technical idea that the risk to the worker is low.

It should be understood that the foregoing description of the background art is merely for the purpose of promoting an understanding of the background of the present invention and is not to be construed as adhering to the prior art already known to those skilled in the art.

2002-0040505 (May 30, 2002) 2003-0048818 (Jun. 25, 2003) 2013-0063737 (2013.06.17)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a blowing flow rate increasing apparatus and method for securing a blowing flow rate at the initial stage of blowing air, which can secure a simple and safe airflow rate after securing a blowing flow rate.

A blowing flow rate increasing device is introduced.

To this end, the present invention provides a flow rate control apparatus comprising: a flow rate regulator for increasing a flow rate of hot air flowing through an inlet formed to have a diameter smaller than a diameter of a tuyere; And a vibration part formed on at least a part of the flow control part so as to apply vibration to the flow control part to induce disappearance of the flow control part and to secure a flow rate of hot air flowing through the tug. .

Wherein the flow rate regulating portion is formed with a large diameter portion in which a cross section of the flow rate regulator gradually decreases in a tugging direction and one side thereof is a small diameter portion located inside the tuyere and the other side is located outside the tuyere.

And the vibrating part is made of a piezoelectric material so that the vibrating part vibrates by the electric energy supplied from the outside and a clearance is generated between the flow controlling part and the vibrating part.

Wherein the vibrating part made of the piezoelectric material is formed in the longitudinal direction of the flow rate adjusting part along the inner side surface of the large diameter part on the inner side surface of the small diameter part and the large diameter part is formed inside the flow rate adjusting part at a predetermined angle And extended in an inclined manner.

The flow rate regulating unit may include yellow soil so that a loss due to the inflow of hot air may occur when vibration is applied.

A method of increasing the blowing flow rate is introduced.

To this end, according to the present invention, there is provided an air filtering apparatus comprising: a blowing preparation step of placing a small diameter portion formed on one side of a flow rate control portion whose cross section gradually decreases, A blowing flow rate increasing step of injecting hot air through the flow rate adjusting unit to increase the flow rate of the blowing air; And a blowing air amount securing step of disposing the flow rate adjusting unit to ensure that the hot air flows through the tuyere to secure the air volume.

In the step of increasing the flow rate of the airflow, a piezoelectric material formed on a part of the flow rate control unit at a high temperature by hot air is coupled to the flow rate control unit.

According to the blowing-flow increasing device and method of the present invention constructed as described above, the following various effects can be realized.

First, there is an advantage that a blowing flow rate can be sufficiently secured even at a low initial air flow rate.

Secondly, after the heat in the blast furnace is sufficiently secured, there is an advantage in that airflow can be ensured by blowing through the original tuyere by a simpler method that does not cause a safety accident.

Third, various advantages such as prevention of melting of the tuyere by melting due to insufficient uniformity of the charge by the insufficient wind energy can be provided.

1 is a perspective view of a blowing flow rate increasing apparatus according to the present invention.
2 is a view showing a state in which a blowing flow rate increasing device according to the present invention is coupled to a tuyere.
3 is a time-sequential flow chart of a method for increasing the flow rate of a blowing gas according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a flow velocity increasing apparatus according to an embodiment of the present invention;

The present invention makes it possible to secure the flow rate of the blowing air at the initial stage of blowing, to secure the flow rate of the blowing air after a predetermined time, and to increase the flow rate of the blowing air after securing the heat in the blast furnace. And the device and the method that the hot air flows into the blast furnace through the original tuyere to secure the air volume is considered as the technical idea.

To this end, the present invention is provided with a flow control unit 100 and a vibration unit 200 as shown in FIG.

As shown in the figure, the flow control unit 100 for increasing the flow velocity of the hot air through the inlet formed at the inlet of the tuyere at a low air flow rate, and the flow control unit 100 by applying vibration to the flow control unit 100 And a vibrating part 200 formed in a part of the flow rate control part 100 so as to secure a flow rate of hot air flowing through the tuyere.

As is known, the flow rate is defined as the product of the cross-sectional area and velocity, as follows:

Q = A x V (Q: flow rate, A: sectional area, V: speed)

On the other hand, the diameter of the tuyere is limited, and the speed of the hot air introduced into the initial blast furnace can be increased by reducing the cross-sectional area through the inlet which is smaller than the diameter of the tuyere under a constant flow condition.

The flow control unit 100 provided with the small diameter portion 110 smaller than the diameter of the tongue will be described in detail as follows.

The flow rate regulator 100 is formed with a large diameter portion 120 in which the cross section of the flow rate regulator 100 gradually decreases in the direction of the tug and one side thereof is the small diameter portion 110 located inside the tug and the other side is located outside the tug .

The flow rate regulator 100 is inserted into the air hole of the blow pipe 30 so that the hot air flows into the blast furnace through the small diameter portion 110 smaller than the diameter of the conventional tuyere.

On the other hand, before the tuyere is installed on the main body of the blast furnace, the flow rate control portion 100 of the present invention is mounted on the tuyere beforehand and installed in the blast furnace main body together with the tuyere.

In this case, it is preferable that the flow rate regulator 100 is made of a mixed material of loess and ceramic. It is important that the flow rate regulator 100 is sandwiched between the tug and the flow rate regulator 100, The hot air flows into the blast furnace along the small-diameter portion 110 through the large-diameter portion 120 through the blower pipe 30.

Since the hot air flows through the small diameter portion 110 smaller than the diameter of the conventional tuyere, the wind speed increases at a constant flow rate condition, thereby achieving the advantage that the blowing flow rate can be secured even at a low air flow rate at the initial stage of blowing.

On the other hand, the flow control unit 100 has a technical feature that a part of the flow control unit 100 is provided with a vibration unit 200 that can apply vibration to the entire flow control unit 100 through external current application.

That is, during the blast furnace operation, the accessibility of the operator is limited due to the high temperature and the flow rate of the hot air. In the case where the operator has the desired level of heat in the blast furnace, the air flow rate is secured rather than the wind speed, There is a need.

Therefore, in order to prevent a safety accident of a worker, the flow control unit 100 is eliminated and then the remnants of the flow control unit 100 are introduced into the blast furnace by hot air, And a vibration unit 200 capable of supplying the hot air through the heat exchanger 200 and securing the air volume.

Although the vibrating part 200 is formed in the longitudinal direction of the flow control part 100 in the figure, it is not limited to such a shape as the flow control part 100 can be sufficiently eliminated. And can be positioned in the flow rate regulator 100 in various shapes depending on the work environment, wind speed, and temperature.

The vibrating part 200 is made of a piezoelectric material so that vibrations itself may be vibrated by electric energy supplied from the outside to create clearance between the flow control part 100 and the vibration part 200. In this case, A brief description of the piezoelectric material or piezoelectric effect will be given below in order to facilitate understanding of the invention.

Piezoelectric effect is known as a phenomenon through interaction between mechanical and electrical states in a material with a certain crystal structure. When a mechanical change (compression or tension) is applied to the material, an electrical signal is generated. On the contrary, When a signal is applied, a mechanical change occurs.

At this time, the former effect is referred to as a primary piezoelectric effect, and the latter is referred to as a secondary piezoelectric effect or a reverse voltage effect. In the present invention, the flow control unit 100 is lost during the blowing operation by using the reverse voltage effect.

That is, the vibration control unit 100 includes a vibration unit 200 made of barium titanate (BaTiO 3 ), a heat-resistant wire 20 capable of supplying current to the vibration unit 200, By providing a voltage applying device 40 capable of supplying the current, a current is applied to the vibration part 200 made of a piezoelectric material to generate vibration if necessary.

1, a heat-resistant wire 20 is connected to the vibration part 200, and a current flowing along the heat-resistant wire 20 is transmitted to the vibration part 200, A separate connection part 10 is provided in the lower part of the vibration part 200 in the longitudinal direction of the flow control part 100 so that the connection part 10 can be any material as long as the conductive material can flow current.

2 is a conceptual diagram in which a heat-resistant electric wire 20 connected to the vibration unit 200 and a voltage applying device 40 are installed. In general, a lance for blowing pulverized coal is introduced into the blower pipe 30 And the heat-resistant electric wire 20 connected to the vibration unit 200 passes through the lance and is connected to a voltage application unit 40 provided outside.

A vibration is generated between the flow control unit 100 made of the yellow earth and the ceramic material and the vibration unit 200 made of the barium titanate material due to the vibration of the vibration unit 200 made of the piezoelectric material, As the rapid hot air flows, the flow control part 100 is broken naturally and the remnant thereof flows into the blast furnace along with the hot wind. As a result, the operator can securely supply the hot wind through the original tuyere, It is possible to obtain an effect that can be secured.

The large diameter portion 120 extends along the circumferential surface of the large diameter portion 120 at an angle to the inside of the flow rate regulating portion 100 and the vibration portion 200 made of a piezoelectric material is extended from the inner side of the small diameter portion 110 The structure is formed in the longitudinal direction of the flow control part 100 along the inner surface of the neck part 120. This structure enhances the effect of vibration and the possibility of disappearing, In order to prevent resistance and abrasion against hot air, it is preferable that the large diameter portion 120 is formed to be inclined at a predetermined angle into the flow rate regulating portion 100 in the flow direction of the hot air, Do.

FIG. 3 is a flowchart illustrating a method of increasing a flow rate of a blowing gas according to an embodiment of the present invention.

As shown in the figure, the method for increasing the flow speed of the present invention includes the step of preparing the air for blowing (S100), the step for increasing the blowing flow rate (S200), and the step for securing the air flow amount (S300).

The blowing preparation step S100 is a step of sandwiching the flow control part 100 formed with the vibration part 200 in a part thereof with the tuyere and the step of blasting the part of the flow control part 100 composed of the mixture of ceramic and yellow soil with the barium titanate material As shown in the figure, the vibrating portion 200 is provided with a small diameter portion 110 on one side thereof and a large diameter portion 120 on the other side thereof.

Of course, this operation may be performed by the operator directly, but there is a risk of a safety accident. As shown in FIG. 2, the wind speed increasing device according to the present invention is inserted into the tuyere and then placed inside the blow pipe 30.

In this case, when the tuyere has the independent structure so that it can be attached to the outer wall of the blast furnace as shown in the drawing, considering the possibility of the breakage of the tuyere itself, the above operation can be performed. However, when the tuyere itself is fixed to the outer wall of the blast furnace, It is introduced using a separate device capable of inserting the inventive blowing flow rate increasing device.

In this way, it is pushed in so as not to create a gap between the tuyere and the air flow rate increasing device, and the air is re-blown in a completely fitted state.

When hot air is injected into the blast furnace through the flow control unit 100 in the blow pipe 30, the air flows into the blast furnace through the small diameter portion 110 smaller than the cross sectional area of the tuyere, .

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 Thereafter, an air flow amount securing step (S300) is performed in which the flow rate regulating unit 100 is eliminated and hot air is introduced through the tug to secure the air volume. An electric signal is applied to the piezoelectric material formed in a part of the flow rate regulating unit 100 Thereby causing a clearance between the flow rate regulator 100 and the vibrator 200 due to the vibration of the piezoelectric material, thereby causing the flow rate regulator 100 to dissipate.

That is, when a current is applied to the piezoelectric material by an external voltage application device, the current is softened and broken from the large-diameter portion 120 side inclined at a predetermined angle into the flow control portion 100, The clearance between the adjusting part 100 and the vibrating part 200 is increased and the pieces are discharged into the furnace by the hot air to be scattered so that the hot air flows through the original tuyere to secure the air volume.

According to the blowing-flow increasing device and method of the present invention, the wind velocity of the hot air introduced into the initial blast furnace is increased, and the blowing-flow increasing device of the present invention can be safely and easily lost, And airflow can be ensured by inducing airflow through the tuyere.

While the present invention has been particularly shown and described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the following claims It will be apparent to those of ordinary skill in the art.

100: flow rate regulator 110:
120: large neck part 200:

Claims (8)

A flow regulator for increasing the flow velocity of the hot air flowing through the inlet formed through the inlet smaller than the diameter of the tuyere and flowing the hot air through the tuyere; And
A vibration part formed on at least a part of the flow control part to apply a vibration to the flow control part to induce a loss of the flow control part and to secure a flow rate of hot air flowing through the tug;
And a blowing flow rate increasing device.
The method according to claim 1,
Wherein the flow-
Wherein a cross section of the tapered portion gradually decreases in a tapered direction and a large diameter portion having a small diameter portion located inside the tuyere at one side thereof and an outer diameter portion located outside the tuyere at the other side thereof is formed.
The method according to claim 1,
The vibrating unit may include:
Wherein the piezoelectric actuator is made of a piezoelectric material so that the piezoelectric actuator vibrates itself by electric energy supplied from the outside to generate a clearance between the flow rate regulator and the vibrating part.
The method of claim 3,
Wherein the vibrating part made of the piezoelectric material is formed in the longitudinal direction of the flow rate adjusting part.
The method according to any one of claims 1 to 4,
Wherein the flow rate regulator includes yellow soil so that a loss due to the inflow of hot air is applied when the vibration is applied.
A small-diameter portion formed on one side of a flow rate regulating portion whose cross-section gradually decreases, and a small-diameter portion placed inside the tuyere;
A blowing flow rate increasing step of injecting hot air through the flow rate adjusting unit to increase the flow rate of the blowing air; And
And an air flow rate increasing step of supplying an electric signal to a piezoelectric material formed in a part of the flow rate adjusting part to eliminate the flow rate adjusting part by vibration of the piezoelectric material so that hot air flows into the air flow through the air flow to secure an air flow rate .

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KR1020140172099A 2014-12-03 2014-12-03 Apparatus and method for increasing fluid velocity of air blowing KR101587742B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020040505A (en) 2000-11-24 2002-05-30 이구택 Method for managing air velocity of tuyere by coal injection ratio
KR20030048818A (en) 2001-12-13 2003-06-25 주식회사 포스코 Apparatus for contolling internal diameter of blast furnace tuyeres
JP2005042171A (en) * 2003-07-24 2005-02-17 Jfe Steel Kk Method for fitting sleeve to tuyere in blast furnace
KR20130063737A (en) 2011-12-07 2013-06-17 주식회사 포스코 Apparatus for controlling the inner diameter of tuyere during furnace operation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020040505A (en) 2000-11-24 2002-05-30 이구택 Method for managing air velocity of tuyere by coal injection ratio
KR20030048818A (en) 2001-12-13 2003-06-25 주식회사 포스코 Apparatus for contolling internal diameter of blast furnace tuyeres
JP2005042171A (en) * 2003-07-24 2005-02-17 Jfe Steel Kk Method for fitting sleeve to tuyere in blast furnace
KR20130063737A (en) 2011-12-07 2013-06-17 주식회사 포스코 Apparatus for controlling the inner diameter of tuyere during furnace operation

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