KR20160137197A

KR20160137197A - Gimbal distributor for furnace

Info

Publication number: KR20160137197A
Application number: KR1020150071979A
Authority: KR
Inventors: 강원경; 이상준
Original assignee: 주식회사 포스코
Priority date: 2015-05-22
Filing date: 2015-05-22
Publication date: 2016-11-30

Abstract

The present invention relates to a base material charging device for a smelting furnace having a turning chute rotationally installed in a lower end of an input pipe into which a base material is inputted to control input distribution of a base material, so as to prevent heat loss of the turning chute by more effectively cooling the turning chute from a high temperature inside a smelting furnace. According to the present invention, provided is the base material charging device for a smelting furnace, wherein the turning chute comprises: an external cover forming an appearance; and a cooling flow path installed in the external cover for a cooling medium to be moved.

Description

[0001] GIMBAL DISTRIBUTOR FOR FURNACE [0002]

Disclosed is a charging device for uniformly distributing and charging raw materials into a melting furnace of a molten iron manufacturing facility.

For example, in a FINEX facility for producing molten iron by reducing spectra, hot compacted iron (HCI) as a raw material and coal briquette as a fuel are charged into a melting furnace to melt the molten iron, After that, steel is manufactured from it and supplied to each customer.

A gimbal distributor is provided at the upper part of the melting furnace to distribute the transported raw materials and fuel (hereinafter, raw materials and fuels collectively referred to as raw materials) according to operating conditions and charge them into the melting furnace. The charging device is a device for uniformly distributing the raw material in the melting furnace in accordance with operating conditions in the furnace, and a turning chute for switching the direction of introduction of the raw material is provided at the lower end.

Since the charging device is exposed to a high temperature inside the melting furnace, the inside of the device and the turning chute are cooled by using a cooling gas such as nitrogen to protect the device.

However, in the conventional cooling method, there is a problem that the cooling area is changed as the turning chute keeps turning, a local temperature change occurs on the surface of the turning chute, and the turning chute is damaged due to the thermal stress fluctuation.

The swivel chute has a refractory attached to an outer shell of the swivel chute. As described above, since the cooling is not properly performed, cracks are generated in the shell due to high temperature and the refractory is detached as the welded portion is worn.

Thus, the raw material distribution control of the melting furnace is poor and the sulfur content becomes unstable. Further, it takes a lot of time to replace and repair the turning suit of the charging device, which results in a problem that the production amount is lowered.

Provided is a raw material charging device for a melting furnace which can more effectively cool a turning chute from a high temperature in a melting furnace and prevent thermal damage of the turning chute.

This embodiment is a raw material charging apparatus for a melting furnace, which comprises a turning chute provided at a lower end of a charging tube to which a raw material is charged so as to be rotatable so as to control the charging distribution of the raw material, wherein the turning chute comprises a sheath constituting an outer shape, And a cooling flow path through which the cooling medium is installed.

And a refractory attached to the outer surface of the shell.

And a cooling water supply unit connected to the cooling channel for supplying and circulating cooling water.

The shell may be made of steel.

The cooling passage may include a front end cooling passage for cooling the leading end portion of the swing chute, and a body cooling passage for cooling the body portion of the swivel chute.

The front end cooling passage includes a front end supply passage that extends from an inlet end of the swivel chute to an outlet end of the swivel chute to supply a cooling medium, a tip portion which is connected to the front end supply passage and extends along an outlet- And a leading end discharge passage connected to the leading end passage and extending from the leading end of the circulating chute to the leading end of the leading chute to discharge the cooling medium.

The body cooling channel is connected to the body supply channel and extends along the surface of the swivel chute in a staggered manner from the output end to the inlet end, A body flow path through which the cooling medium flows to the surface of the chute, and a body discharge flow path connected to the body flow path extending to the inlet side tip end to discharge the cooling medium.

The swivel chute may have a cylindrical structure.

As described above, according to the present embodiment, the cooling effect of the swivel chute is increased to prevent the thermal deformation of the swivel chute and to extend the life span as much as possible.

Further, the control of the distribution of the raw materials in the charging device can be stably maintained in the long term, so that the smelting operation can be stabilized and the productivity can be enhanced.

1 is a view showing a raw material charging apparatus for a melting furnace according to an embodiment of the present invention.
2 is a cross-sectional view showing the structure of a turning chute of the raw material charging apparatus according to the present embodiment.
3 is a more detailed sectional view of the swivel chute according to the present embodiment.
4 is a schematic view for explaining the cooling water circulation structure of the swivel chute according to the present embodiment.
Fig. 5 is a chart showing the cooling efficiency of the swivel chute according to the present embodiment in comparison with the conventional one.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the 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.

Hereinafter, the present embodiment will be described as an example of a gimbal distributor in which a hot compacted iron (HCI) and a coal briquette are mixed and charged into a melting furnace in a molten iron manufacturing facility called FINEX Explain.

The molten iron manufacturing facility includes a reducing furnace and a melting furnace. A charging device is installed in the upper end of the melting furnace to charge the raw materials evenly.

As shown in FIG. 1, the charging apparatus 10 includes a charging pipe 20 for charging a raw material and fuel (hereinafter referred to as raw materials, collectively referred to as raw materials) transferred to the upper end of the melting furnace into the melting furnace, A swirling chute 30 disposed at the lower end of the inlet pipe 20 for switching the discharge direction of the raw material discharged from the inlet pipe 20 and a drive unit 40 for rotating the swirling chute 30 in a desired discharge direction . Accordingly, the tilting angle of the swing chute 30 is varied along the circumferential direction about the injection pipe 20 by the driving unit 40, and the raw material is uniformly charged into the melting furnace.

As shown in FIG. 2, the swing chute 30 extends downward from the lower end of the inlet pipe 20 toward the inside of the melting furnace. The swivel chute 30 has a cylindrical shape with upper and lower ends opened. The upper end of the swivel chute 30 is connected to the inlet pipe 20 to form an inlet through which the raw material flows, and the lower end forms an outlet through which the raw material is discharged. In the following description, "upper" or "upper" refers to the upward direction in the y-axis in FIG. 2, and "down" or "downward" refers to the opposite direction.

The swivel chute 30 may include a steel outer shell 32 and a refractory 34 attached to the outer circumferential surface of the outer shell 32 to form a cylindrical outer shape. The sheath 32 may be made of, for example, stainless steel or heat resistant steel.

The charging apparatus 10 of the present embodiment may include a cooling passage 50 provided inside the shell 32 in the orbiting chute 30 having the above-described structure to move the cooling medium. The swirling chute 30 is configured such that the cooling medium cools the enclosure 32 as it passes the enclosure 32 along the cooling passage 50 so that the swirling chute 30 is rotated regardless of the movement of the swing chute 30. [ The whole can be properly cooled.

As described above, by cooling the cooling medium to flow into the outer shell 32, it is possible to prevent thermal shock of the outer shell 32 even if the refractory 34 is dropped. Also, even if the swing chute 30 is formed only by the shell 32, it is possible to prevent the outer shell 32 from being damaged from the high temperature inside the melting furnace.

The cooling passage 50 can be understood as a pipe structure having a predetermined diameter so that the cooling medium can be moved. The cooling channel 50 may be formed by providing a cooling jacket having a flow path formed inside the outer shell 32 when the outer shell 32 is manufactured or by processing the cooling channel 50 during casting of the outer shell 32 .

In this embodiment, the cooling medium may be made of cooling water. As the cooling medium, various materials such as cooling oil may be used in addition to cooling water.

The charging apparatus 10 further includes a cooling water supply unit 60 connected to the cooling passage 50 of the shell 32 to supply and circulate cooling water. The cooling water supply unit 60 may include, for example, a supply pump for forcibly circulating cooling water and a cooling water tank in which cooling water is received. The cooling water supply unit 60 may be connected to the cooling channel 50 so as to circulate and supply cooling water. The cooling water supply unit 60 may be installed in the charging apparatus 10 or may be installed outside the melting furnace and connected to the cooling channel 50 of the orbiting chute 30 through the charging apparatus 10.

3 and 4 show the specific structure of the cooling passage 50 provided in the turning chute 30 according to the present embodiment.

3, the cooling passage 50 includes a leading end cooling passage for cooling the leading end portion R of the turning chute 30 and a body cooling portion for cooling the body portion B of the turning chute 30, Includes the Euro. The outgoing front end R means the lower lower end of the swivel chute 30 and the body part B means the rest of the swivel chute 30 except for the lower end. The inlet-side tip end means the upper end of the swivel chute, that is, the tip end opposite to the outlet-side tip end.

That is, in the present embodiment, the cooling passage 50 has a structure in which the outgoing front end R, which is the lower end portion of the swing chute 30, and the body portion B, which is a portion other than the lower end portion, are cooled.

The lower end of the swirling chute 30 is directed to the lower side of the melting furnace, so that the outgoing end R of the raw material comes closest to the inside of the melting furnace and receives more heat.

As described above, by separately cooling the leading end R of the turning chute 30 most affected by the high temperature, the turning chute 30 can be more effectively protected from the high temperature.

The front end cooling passage is structured such that cooling water is directly supplied to the outward end portion R of the swivel chute 30 and only the outgoing front end portion R is cooled and then discharged. The front end cooling passage includes a front end supply passage 51 extending from an upper portion of the swing chute 30 to an outgoing front end portion R to supply a cooling medium to the swing chute 30, Of the swirling chute 30 and a leading end flow path 52 extending from the leading end portion R of the swirling chute 30 to the outlet leading end R of the swirling chute 30, And a leading end discharge passage 53 extending to the inlet-side leading end and discharging the cooling medium.

3, the swing chute 30 is formed in a cylindrical shape so that the front end channel 52 passes through the outgoing front end R of the swivel chute 30 in a circular shape, 51 and the end discharge flow path 53 extend linearly from the upper end to the lower end of the swivel chute 30 at intervals and are connected to both ends of the end flow path 52.

As described above, the cooling water is supplied directly to the outward end portion R of the swing chute 30 through the front end cooling passage and only the outgoing front end R is cooled, thereby shortening the circulation time of the cooling water, thereby further increasing the cooling efficiency. Therefore, it is possible to effectively cool the outgoing tip end R having the largest heat load in the entire swivel chute 30.

The body cooling passage includes a body supply passage 54 extending from an inlet end of the swing chute 30 to an outlet end R for supplying a cooling medium, a body supply passage 54 connected to the body supply passage 54, A body passage 55 extending in zigzag form from the output end R to the inlet end along the surface to flow the cooling medium to the surface of the orbiting chute 30 and a body passage 55 extending to the inlet end, And a body discharge passage 56 through which the medium is discharged.

3, the body supply passage 54 extends linearly from the upper end to the lower end of the swivel chute 30 at a predetermined distance from the end supply passage 51, for example. The body passage 55 connected to the lower end of the body supply passage 54 is formed in a zigzag shape from the lower portion of the swivel chute 30 toward the upper portion thereof. The body passage 55 is formed in a zigzag shape so as to evenly pass over the entire body portion B of the orbiting chute 30. The body passage portion 55 is formed in a zigzag shape, do. The body passage 55 extending over the swivel chute 30 is connected to a body discharge passage 56 formed at a predetermined distance from the end discharge passage 53.

Thus, the cooling water passes through the entire body portion B of the orbiting chute 30 through the body cooling flow path to cool the orbiting chute 30.

Fig. 4 schematically shows the cooling structure of the swivel chute 30. Fig. 4, the cooling water supplied through the body supply passage 54 is directly transferred to the lower portion of the swivel chute 30 to be cooled from the lower portion of the swivel chute 30. Thus, the lower side of the swivel chute 30 having a relatively large heat load can be further cooled. Cooling water is entirely cooled in the entire body portion (B) by passing the body passage (55) in a zigzag form over the entire surface of the body portion (B) of the swivel chute (30). The body passage 55 is provided on the outer shell 32 of the swivel chute 30 so that the swivel chute 30 can be stably and uniformly cooled regardless of the movement or position of the swivel chute 30 .

The cooling water that has been heat-exchanged while passing through the body passage (55) is circulated through the body discharge passage (56).

Furthermore, the outgoing front end portion R of the turning chute 30 is cooled separately through the front end cooling passage. The cooling water supplied through the front end supply passage 51 is directly conveyed to the outward end portion R of the swivel chute 30 and passes through the front end passage 52 formed in the outgoing end portion R to cool only the outgoing front end portion R . The cooling water that has been heat-exchanged while passing through the front end flow path (52) is discharged directly through the front end discharge flow path (53). As described above, the cooling water is supplied to the outgoing tip end R of the swing chute 30 through the leading end cooling passage in a short period of time, and only the outgoing tip end R is cooled and then discharged.

As described above, cooling is performed intensively at the outgoing tip end R of the orbiting chute 30, which is the portion where the heat load is most received, so that the damage can be minimized.

5 is a chart showing the cooling efficiency of the swivel chute 30 according to the present embodiment compared with the conventional one.

5, the comparative examples are divided into the welding type of the shell 32 and the shape of the inner tube, and all of them are the swivel chutes 30 of the structure in which the cooling passage 50 is not provided in the shell 32. And cooling was performed using nitrogen gas as well. Comparative Example 3 is a structure in which a Cerak Wool, which is a heat insulator, is installed inside the endothelium. As described in the embodiment, cooling water is supplied to the cooling passage 50 in the swivel chute 30 of the present embodiment in which the cooling passage 50 is formed in the shell 32 and only the refractory 34 is attached to the outside The turning chute 30 was cooled.

As shown in FIG. 5, in the comparative examples, the cooling of the swing chute 30 could not be properly performed due to the movement of the swing chute 30, so that cracks occurred in the shell 32 and the life span did not exceed six months. In particular, in the case where a sheath is provided inside as in Comparative Example 3, the cooling effect is reduced due to the interruption of the internal heat, and the temperature of the sheath 32 rises.

In the embodiment, since the cooling water is circulated along the shell 32 and stable cooling is performed irrespective of the movement of the swivel chute 30, the life is extended twice or more than the comparative example I could.

Therefore, in the case of the present embodiment, it is understood that the cooling effect of the turning chute 30 is increased to prevent thermal deformation of the turning chute 30 and extend the service life to the maximum.

While the illustrative embodiments of the present invention have been shown and described, various modifications and alternative embodiments may be made by those skilled in the art. Such variations and other embodiments will be considered and included in the appended claims, all without departing from the true spirit and scope of the invention.

10: charging device 20: input pipe
30: turning suit 32: sheath
34: refractory 40:
50: cooling channel 51: end feed channel
52: leading end passage 53: leading end discharging passage
54: body supply channel 55: body channel
56: Body discharge channel 60: Cooling water supply part

Claims

In a raw material charging apparatus for a melting furnace including a swirling chute rotatably installed at a lower end of a charging pipe into which a raw material is charged,
Wherein the swivel chute includes an outer casing and a cooling channel provided on the outer casing for moving the cooling medium,
Wherein the cooling flow path includes a front end cooling flow path for cooling the leading end portion of the swing chute and a body cooling flow path for cooling the body portion of the swivel chute.

The method according to claim 1,
And a refractory attached to the outer circumferential surface of the outer shell.

3. The method of claim 2,
And a cooling water supply unit connected to the cooling channel for supplying and circulating cooling water.

4. The method according to any one of claims 1 to 3,
The front end cooling passage includes a front end supply passage that extends from an inlet end of the swivel chute to an outlet end of the swivel chute to supply a cooling medium, a tip portion which is connected to the front end supply passage and extends along an outlet- And a leading end discharge passage connected to the leading end passage and extending from the leading end of the turning chute to the leading end of the leading end to discharge the cooling medium.

5. The method of claim 4,
The body cooling channel is connected to the body supply channel and extends along the surface of the swivel chute in a staggered manner from the output end to the inlet end, A body flow path for flowing the cooling medium to the surface of the chute, and a body discharge flow path connected to the body flow path extending to the inlet side front end to discharge the cooling medium.

6. The method of claim 5,
Wherein the turning chute is a cylindrical structure.

The method according to claim 6,
Wherein the casing is made of a steel material.