KR102263289B1 - Apparatus for adjusting velocity of melter-gasifier tuyere - Google Patents

Abstract

A tuyere flow rate adjustment device for a melter-gasifier is provided. The tuyere flow rate adjusting device according to the present invention comprises an oxygen blowing pipe connected to a tuyere of a melter-gasifier into which oxygen is blown, and a flow rate adjusting device installed in the oxygen blowing pipe and discharged through the outlet of the tuyere for adjusting the flow rate of the tuyere. includes

Description

Apparatus for adjusting the tuyere flow rate of the melter-gasifier {APPARATUS FOR ADJUSTING VELOCITY OF MELTER-GASIFIER TUYERE}

The present invention relates to a tuyere flow rate adjustment device for a melter-gasifier.

In general, among the molten iron manufacturing methods, the FINEX method includes a process for reducing iron ore through a multi-stage fluidized reduction furnace and a coal briquette process for agglomerating powdered coal. It is a method capable of producing molten iron by directly using powdered iron ore and powdered coal.

Since powdered iron ore and powdered coal can be used directly, it is economical to operate compared to the Corex method, and has the advantage of significantly reducing the emission of environmental pollutants compared to the blast furnace method.

In addition, in the case of the blast furnace method, it is necessary to blow in hot air at a temperature higher than the set temperature, so a large-sized pipe with a hot stove facility and a refractory material is required.

However, since the Corex and Finex methods produce molten iron by blowing pure oxygen from cold air instead of hot air at high temperature, there is no need for a hot stove. Simplification is possible.

In addition, the size of the tuyere, which is a device for blowing oxygen into the melter-gasifier, is also smaller than that of the blast furnace blowing hot air due to the effect of pure oxygen blowing.

As described above, the FINEX method has the advantage of being able to directly use powdered iron ore and coal and does not need a hot stove connected to the melter-gasifier. However, compared to a blast furnace that blows high-temperature hot air by blowing in cold air oxygen, the amount of heat input to the tuyere The downside is that it is small.

Therefore, as a method to compensate for this, a method of increasing the temperature of oxygen entering through the tuyere through heat exchange of the exhaust gas has been proposed.

However, when oxygen is heated and blown into the melter-gasifier, the density of oxygen is reduced, and the flow rate of oxygen becomes faster than before the temperature rise under the condition that the same absolute flow rate of oxygen is blown.

The melter-gasifier contains char briquettes. When the flow rate of oxygen injected through the tuyere increases, the kinetic energy of oxygen increases in proportion to this. When the kinetic energy of oxygen colliding with the char increases, the char becomes oxygen stream. It is more likely to be differentiated into powder form by the impact of

The temperature of oxygen blown into the melter-gasifier operates within the operating temperature and operating flow rate range. In theory, if the oxygen temperature increases above the set temperature at the operating temperature, the flow rate increases by several times. out of the appropriate range of

Therefore, when oxygen is heated and blown in, it must be replaced with a large-diameter tuyere to secure an appropriate flow rate. However, since the molten iron manufacturing process including the Finex method cannot replace the tuyere during operation, a new method is urgently needed to solve this problem. do.

An object of the present invention is to provide an apparatus for adjusting the flow rate of a tuyere of a melter-gasifier capable of securing an appropriate flow rate of oxygen discharged from the tuyere when a fluctuation factor in the flow rate of oxygen blown into the melter-gasifier occurs.

An apparatus for adjusting the flow rate of a tuyere of a melter-gasifier according to an embodiment of the present invention includes an oxygen blowing pipe connected to a tuyere of a melter-gasifier into which oxygen is blown, and an oxygen blowing pipe installed in the oxygen blowing pipe and discharged through the outlet of the tuyere. It may include a flow rate adjusting device for adjusting the flow rate.

The flow rate adjusting device includes a flow rate adjusting rod for adjusting the cross-sectional area of the discharge port by being inserted and coupled to the inside of the oxygen injection pipe so as to move forward and backward, and a cylinder for moving the flow rate adjusting rod forward or backward in the oxygen injection tube by being coupled to the flow rate adjusting rod. may include

The flow rate adjusting rod is formed in a cylindrical shape having an outer diameter smaller than the inner diameter of the tuyere and the oxygen blowing tube, and may be arranged to move forward and backward along the longitudinal centerline of the tuyere and the oxygen blowing tube.

The flow rate adjusting rod may be connected to the cylinder rod of the cylinder by a connecting portion.

A support holder for the tuyere for supporting the flow rate regulating rod in the tuyere may be installed on the outer surface of the flow control rod.

The support holder for the tuyere may include at least three or more tuyere supports protruding outward at regular intervals on the outer surface of the flow rate adjusting rod.

A support holder for an oxygen injection tube for supporting the flow rate adjustment rod in the oxygen injection tube may be installed on the outer surface of the flow rate adjusting rod.

The support holder for the oxygen injection tube may include at least three or more oxygen injection tube supports protruding outward at regular intervals on the outer surface of the flow rate adjusting rod.

According to the embodiment of the present invention, even under a condition in which the flow rate of oxygen blown into the tuyere fluctuates due to the rise in oxygen temperature, it is possible to operate an operation that secures an appropriate flow rate of oxygen without replacing the tuyere. Operation efficiency can be improved without degradation.

1 is a schematic configuration diagram of a tuyere flow rate adjusting device of a melter-gasifier according to an embodiment of the present invention, and is a view showing a state in which a flow rate adjusting rod is inserted into a tuyere outlet.
FIG. 2 is a schematic configuration diagram of an apparatus for adjusting the flow rate of a tuyere of a melter-gasifier according to an embodiment of the present invention, and is a view showing a state in which the flow rate adjusting rod is drawn out from the tuyere outlet.
3 is a schematic cross-sectional view showing the structure of the support holder for the winnowing fan of the tuyere flow rate adjusting device of the melter-gasifier according to an embodiment of the present invention.
4 is a schematic cross-sectional view showing a structure of a support holder for an oxygen blowing tube of the tuyere flow rate adjusting device of the melter-gasifier according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention will be described so that those of ordinary skill in the art can easily carry out the present invention. As can be easily understood by those of ordinary skill in the art to which the present invention pertains, the embodiments described below may be modified in various forms without departing from the concept and scope of the present invention. Wherever possible, identical or similar parts are denoted by the same reference numerals in the drawings.

The terminology used below is for the purpose of referring to specific embodiments only, and is not intended to limit the present invention. As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. As used herein, the meaning of “comprising” specifies a particular characteristic, region, integer, step, operation, element and/or component, and other specific characteristic, region, integer, step, operation, element, component, and/or group. It does not exclude the existence or addition of

All terms including technical terms and scientific terms used below have the same meaning as those commonly understood by those of ordinary skill in the art to which the present invention belongs. Terms defined in the dictionary are further interpreted as having a meaning consistent with the related art literature and the presently disclosed content, and unless defined, are not interpreted in an ideal or very formal meaning.

1 is a schematic configuration diagram of an apparatus for adjusting the flow rate of a tuyere of a melter-gasifier according to an embodiment of the present invention, and is a view showing a state in which a flow rate adjusting rod is inserted into the tuyere outlet, FIG. 2 is a flow rate adjusting rod drawn out from the tuyere outlet It is a drawing showing the state of being

Figure 3 is a schematic cross-sectional view showing the structure of the support holder for the tuyere of the tuyere flow rate adjustment device of the melter-gasifier according to an embodiment of the present invention, Figure 4 is a tuyere flow velocity of the melter-gasifier according to an embodiment of the present invention. It is a schematic sectional drawing which shows the structure of the support holder for oxygen blowing tubes of an adjustment apparatus.

1 to 4 , the tuyere flow rate adjusting device of the melter-gasifier according to an embodiment of the present invention may include an oxygen blowing pipe 20 and a flow rate adjusting device 100 .

The oxygen blowing pipe 20 is connected to the tuyere 10 provided in the melter-gasifier 3 to blow oxygen 1 into the melter-gasifier 3 through the tuyere 10 .

The flow rate adjusting device 100 is installed in the oxygen blowing pipe 20, and when the flow rate fluctuation factor of the oxygen 1 blown into the tuyere 10 occurs, the tuyere 10 to ensure an appropriate flow rate of the oxygen 1 It is possible to adjust the flow rate of oxygen discharged through the outlet 11 of the.

The discharge port 11 refers to a portion from which the oxygen 1 is discharged from the tuyere 10 , that is, the tip of the tuyere 10 (the left end of FIGS. 1 and 2 ).

In FIGS. 1 and 2 , the right end of the tuyere 10 indicates a portion to which the oxygen blowing tube 20 is coupled, that is, the rear end of the tuyere 10 .

The discharge port 11 of the tuyere 10 , that is, the tip of the tuyere 10 may have an inner diameter smaller than the inner diameter of the rear end of the tuyere 10 . Furthermore, between the rear end and the front end of the tuyere 10, a portion having an inner diameter gradually smaller than the inner diameter of the rear end may be positioned.

The oxygen injection pipe 20 may be formed of a cylindrical pipe or tube having an inner diameter of a set size.

Then, the flow rate adjusting device 100 is inserted and coupled to the inside of the oxygen blowing tube 20 so as to be able to move forward and backward, and adjust the opening area (or cross-sectional area) of the discharge port 11 to adjust the oxygen flow rate of the discharge port 11 . It may include a flow rate adjustment rod 110 for the.

That is, the oxygen flow rate may be adjusted by the flow rate adjusting rod 110 located in the discharge port 11 . Here, the oxygen flow rate may be more finely adjusted according to the cross-sectional area of the flow rate adjusting rod 110 .

In addition, the flow rate adjusting device 100 is coupled to one end of the flow rate adjusting rod 110, and may include a cylinder 120 for moving the flow rate adjusting rod 110 forward or backward in the oxygen blowing tube 20 inside. .

Here, advancing indicates that the flow rate adjusting rod 110 moves from the oxygen blowing tube 20 toward the tuyere 10 as shown by the arrow in FIG. 1 in the state of FIG. 2 .

In addition, the backward movement refers to the movement of the flow rate adjusting rod 110 in the state of FIG. 1 to the opposite side of the tuyere 10 toward the oxygen blowing tube 20 as shown by the arrow in FIG. 2 .

The flow rate adjusting rod 110 is made of a cylindrical shape having a set diameter, and the length set so that the inside of the tuyere 10 and the oxygen blowing tube 20 can move forward and backward, that is, the length of the flow rate adjusting rod 110 is the tuyere ( 10) and the length of the oxygen injection pipe 20 may be set to be greater than or equal to the sum of the lengths.

The flow rate adjusting rod 110 has an outer diameter smaller than the inner diameter of the tuyere 10 and the oxygen blowing pipe 20 for easy movement in the tuyere 10 and the oxygen blowing pipe 20, and the tuyere 10 and oxygen blowing in. It may be disposed so as to move forward and backward along the longitudinal centerline (line OO) of the tube 20 .

The flow rate of oxygen passing through the tuyere 10 may be adjusted according to the insertion length of the flow rate adjusting rod 110 inserted into the tuyere 10 , that is, the insertion volume of the flow velocity adjusting rod 110 occupied in the tuyere 10 .

The flow rate adjusting rod 110 may be connected forward and backward along the inside of the oxygen injection pipe 20 by the cylinder 120 and the connecting part 200 .

That is, one end (the right end of FIGS. 1 and 2 ) of the connection part 200 is coupled to the cylinder rod 121 of the cylinder 120 , and the other end of the connection part 200 (the left end of FIGS. 1 and 2 ). ) may be combined with the flow rate adjustment rod (110).

In addition, a support holder 300 for the tuyere for supporting the flow rate adjusting rod 110 in the tuyere 10 when the flow velocity adjusting rod 110 moves forward or backward may be installed on the outer surface of the flow rate adjusting rod 110 .

The size of the support holder 300 for the tuyere may be substantially the same as the minimum inner diameter of the tuyere 10 so that it can be easily moved within the tuyere 10 when the flow rate adjusting rod 110 moves forward and backward.

In addition, the support holder 300 for the winnowing fan is at least protruding to the outside of the flow rate adjusting rod 110 at regular intervals on the outer surface of the flow rate adjusting rod 110 so as to effectively support the flow rate adjusting rod 110 within the winnowing fan 10 . It may include three or more tuyere supports 310 .

The winnowing fan support 310 may have a structure in which the vertex is arranged to be sharper from the outer surface of the flow rate adjusting rod 110 to the outside to minimize the flow resistance of the oxygen 1 in the winnowing fan 10 .

A support holder 400 for an oxygen injection tube for supporting the flow rate adjustment rod 110 in the oxygen injection tube 20 when the flow rate adjustment rod 110 moves forward or backward may be installed on the outer surface of the flow rate adjustment rod 110 .

The support holder 400 for the oxygen blowing tube may be disposed at a set distance from the support holder 300 for the tuyere along the longitudinal direction (the O-O line direction) of the flow rate adjusting rod 110 .

The size of the support holder 400 for the oxygen blowing pipe may be substantially the same as the inner diameter of the oxygen blowing pipe 20 so that it can be easily moved in the oxygen blowing pipe 20 when the flow rate adjusting rod 110 moves forward and backward. .

In addition, the support holder 400 for the oxygen injection tube is on the outer surface of the flow rate adjustment rod 110 so as to effectively support the flow rate adjustment rod 110 in the oxygen injection tube 20 at regular intervals on the outside of the flow rate adjustment rod 110 . It may include at least three or more oxygen blowing pipe supports 410 that protrude.

The oxygen injection pipe support 410 has a structure in which the vertex is arranged to be sharper from the outer surface of the flow rate adjusting rod 110 to the outside so as to minimize the flow resistance of the oxygen 1 in the oxygen injection tube 20. have.

Hereinafter, with reference to FIGS. 1 to 4, the operation of the tuyere flow rate adjusting device of the melter-gasifier according to an embodiment of the present invention will be described.

Oxygen 1 is blown into the tuyere 10 of the melter-gasifier 3 via the oxygen blowing pipe 20 .

The flow velocity of oxygen flowing along the winnowing fan 10 when oxygen 1 is blown into the winnowing fan 10 is determined according to the diameter of the tip of the winnowing fan 10 , that is, the diameter of the outlet 11 .

The flow rate adjusting rod 110 of the flow rate adjusting device 100 is inserted and coupled to the oxygen blowing pipe 20 and installed, and one end of the flow rate adjusting rod 110 is along the longitudinal direction (OO line direction) of the oxygen blowing pipe 20 . It is connected to the cylinder rod 121 of the cylinder 120 capable of moving forward and backward through the connecting portion 200 .

In a condition in which the oxygen flow rate increases, such as oxygen temperature, the cross-sectional area of the tuyere 10 must be increased, so that the cylinder rod 121 of the cylinder 120 is contracted as shown in FIG. 2 .

As the cylinder rod 121 of the cylinder 120 is contracted, the flow rate adjusting rod 110 moves backwards toward the opposite end of the outlet 11 of the tuyere 10, that is, the rear end of the tuyere 10 (from the position in FIG. 1 ). 2) and is drawn out to the outside of the rear end of the tuyere 10.

Since the diameter of the outlet 11 is gradually reduced toward the tip side of the tuyere 10, the flow rate adjusting rod 110 is drawn out of the rear end of the tuyere 10, the oxygen of the tuyere 10 is It does not affect the flow rate.

On the other hand, the cross-sectional area of the outlet 11 of the tuyere 10 should be reduced because the volume of oxygen is reduced under conditions in which oxygen temperature rise is stopped and cold air oxygen is blown due to a problem in the heat exchanger during the oxygen temperature raising operation.

In this case, as shown in FIG. 1 , the cylinder rod 121 of the cylinder 120 is extended to a set length, and one end (the left end of FIG. 1 ) of the flow rate adjusting rod 110 is inserted into the tuyere 10 and then the tuyere 10 . It advances (moves from the position of FIG. 2 to the position of FIG. 1) to the discharge port 11 of

As such, when one end of the flow rate adjusting rod 110 advances to the outlet 11 , the flow rate of oxygen 1 passing through the outlet 11 of the tuyere 10 is reduced by the cross-sectional area of the flow rate adjusting rod 110 . It becomes faster under the influence of the cross-sectional area of (11).

Of course, even when one end of the flow rate adjusting rod 110 does not advance to the outlet 11 , if the flow rate adjusting rod 110 is inserted into the tuyere 10 , as much as the volume of the flow rate adjusting rod 110 inserted into the tuyere 10 . Since the volume of the tuyere 10 is reduced, the oxygen flow rate of the tuyere 10 may be increased under the influence of the reduced volume in the tuyere 10 .

Accordingly, the oxygen flow rate of the tuyere 10 may be increased by adjusting the insertion volume occupied by the tuyere 10 of the flow rate adjusting rod 110 .

In addition, since the flow rate adjusting rod 110 is movably supported by the tuyere support 310 of the tuyere support holder 300 in the tuyere 10, when moving forward and backward in the tuyere 10, the tuyere (10) It becomes possible to move along the longitudinal centerline (line OO) of

That is, even when one end of the flow rate adjusting rod 110 moves to the outlet 11 of the tuyere 10, it is supported by the tuyere support 310 and can move along the longitudinal center line (line OO) of the tuyere 10. .

In addition, since the flow rate adjusting rod 110 is movably supported by the oxygen blowing pipe support 410 of the oxygen blowing pipe support holder 400 in the oxygen blowing pipe 20, it moves forward in the oxygen blowing pipe 20. And it is possible to move at the position of the longitudinal center line (line OO) of the oxygen injection pipe 20 when reversing.

Examples of the diameter of the tuyere 10 and the use of the flow rate adjusting device 100 are shown in Table 1 below.

[Table 1]

In [Table 1], when the tip pressure of the tuyere 10 is about 5.7 atm based on atmospheric pressure, when 2,400 Nm ³ of oxygen (1) is blown into one tuyere 10 per hour, low-temperature oxygen (1) ) When blowing, when the tip diameter of the tuyere 10 is about 30 mm, an appropriate oxygen flow rate of the tuyere is ensured.

However, when the oxygen of the tuyere 10 is raised to 300° C. and the high-temperature oxygen 1 is blown, the tip diameter of the tuyere 10 must be enlarged to 41 mm to ensure an appropriate oxygen flow rate of the tuyere 10 .

In the case where the low-temperature oxygen (1) and the high-temperature oxygen (1) are blown in a state in which the flow rate adjusting device 100 is not present in the tuyere 10, a tuyere 10 having a tip diameter suitable for the oxygen flow rate of each tuyere 10 is replaced. shall.

On the other hand, when the tuyere 10 provided with the flow rate adjusting device 100 is operated, both the blowing conditions of the low-temperature oxygen 1 and the high-temperature oxygen 1 can be satisfied with the tuyere 10 having a single tip diameter.

That is, a tuyere 10 having a tip diameter of 41 mm is installed in the melter-gasifier, and when low-temperature oxygen 1 is blown in, the flow rate adjusting device 100 having a diameter of 28 mm is advanced to the tip of the tuyere 10, When the tip area is reduced, the flow rate of oxygen 1 similar to the oxygen flow rate when the tuyere 10 having a tip diameter of 30 mm is installed can be secured.

When the high-temperature oxygen 1 is blown through heat exchange, etc., when the flow rate adjusting device 100 is drawn out to the outside of the rear end of the tuyere 10, the tip area of the tuyere 10 is enlarged, which is suitable for blowing in the high-temperature oxygen 1 It can be seen that the oxygen flow rate is secured.

In [Table 1], the temperature of oxygen has been described as an example of the oxygen flow rate fluctuation factor of the tuyere 10, but it can be applied in the same manner as described above when other factors such as flow rate other than the oxygen temperature occur. is of course

Although the present disclosure has been described through preferred embodiments as described above, the present invention is not limited thereto, and various modifications and variations are possible without departing from the scope of the claims set forth below. Those in the field will understand easily.

10: Balloon
20: oxygen blowing pipe
100: flow rate regulator
110: flow rate control rod
120: cylinder
200: connection
300: support holder for tuyere
400: support holder for oxygen blowing tube

Claims (8)

an oxygen blowing pipe connected to the tuyere of the melter-gasifier into which oxygen is blown, and
A flow rate adjusting device installed in the oxygen injection pipe and configured to adjust the flow rate of oxygen discharged through the outlet of the tuyere
including,
The flow rate adjusting device,
A flow rate adjusting rod for adjusting the cross-sectional area of the discharge port by being inserted and coupled to the inside of the oxygen blowing tube so as to move forward and backward;
The tuyere flow rate adjusting device of the melter-gasifier comprising a cylinder coupled to the flow rate adjusting rod, for advancing or reversing the flow rate adjusting rod inside the oxygen injection pipe. delete According to claim 1,
The flow rate adjusting rod is made of a cylindrical shape having an outer diameter smaller than the inner diameter of the tuyere and the oxygen blowing pipe, and is arranged to move forward and backward along the longitudinal centerline of the tuyere and the oxygen blowing pipe. Device. According to claim 1,
The flow rate adjusting rod is a tuyere flow rate adjusting device of the melter gasifier is connected by the connecting portion and the cylinder rod of the cylinder. 5. The method of any one of claims 1, 3 and 4,
The tuyere flow rate adjusting device of the melter gasifier is provided with a support holder for the tuyere for supporting the flow rate adjusting rod in the tuyere on the outer surface of the flow rate control rod. 6. The method of claim 5,
The support holder for the tuyere is a tuyere flow rate adjusting device of the melter gasifier comprising at least three or more tuyere supports protruding outward at regular intervals on the outer surface of the flow rate adjusting rod. 7. The method of claim 6,
A tuyere flow rate adjusting device for a melter gasifier is provided with a support holder for an oxygen blowing tube for supporting the flow rate adjusting rod in the oxygen blowing tube on the outer surface of the flow rate adjusting rod. 8. The method of claim 7,
The support holder for the oxygen blowing pipe is a tuyere flow rate adjusting device of the melter gasifier comprising at least three oxygen blowing pipe supports protruding outward at regular intervals on the outer surface of the flow rate adjusting rod.

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