JP2003028573A - Stabilizing burner and water-cooled panel for electric furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that the outside of an electric furnace is a complicated and narrow circumstance where various kinds of structures and members, etc., are tangled therefore various kinds of maintenance works of not only a stabilizing burner but also the electric furnace are complex and difficult to perform because the stabilizing burner installed on a furnace wall and a water-cooled panel used as a lining of the wall are separately required in the furnace. SOLUTION: A burner main body 7 is formed into a panel feature so as to fit in the water-cooled panel 6 as the stabilizing burner 1. The burner main body 7 itself is provided with a structural hole 25 for a first burner used for flame fuel such as gas and oil, and a structural hole 26 for a second burner used for supporting gas such as oxygen. Also, the inside of the burner main body 7 is provided with a cooling channel 16.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an auxiliary combustion burner for an electric furnace and a water-cooled panel.

[0002]

2. Description of the Related Art As is well known, an arc type electric furnace has a furnace body and a furnace lid for covering the furnace body, and a plurality of electrodes are provided on the furnace lid in a vertically movable state. In this structure, the raw material (scrap) charged in the furnace is melted by the arc generated from the electrode. In recent years, a gas- or oil-type auxiliary combustion burner (side burner) has been generally provided on the furnace wall forming the furnace body, and the burner flame from the auxiliary combustion burner is used to accelerate the melting of the raw materials. I have to.

In many cases, the auxiliary combustion burner is formed in a cylindrical shape, and a burner cooling sleeve is externally fitted near the tip end facing the inside of the furnace, and this sleeve penetrates through the furnace wall of the furnace body. It is inserted and fixed in the burner mounting hole provided. The tail end side of the auxiliary combustion burner projects from the sleeve outside the furnace.Around this projecting tail end, a connector for connecting a flame fuel supply pipe and cooling for passing into the burner are provided. A water supply connector and a drain connector for water are provided.

The term "flame fuel" as used herein refers to petroleum-based gas or oil, but it may be referred to as "flame fuel" including oxygen as a supporting gas. Therefore, this flame fuel supply connector may be provided in only one place or in two places. Note that some auxiliary combustion burners use only oxygen alone without using gas or oil, and the oxygen in such single use is also referred to as flame fuel in this specification. On the other hand, the sleeve described above has a hollow inside, and cooling water is circulated in and out of the hollow portion to cool the auxiliary burner. Therefore, the water supply connector and the drainage connector for cooling water are also provided around the tail end outside the furnace in this sleeve.

[0005]

As described above, the auxiliary burner and the tail end of the sleeve are projected around the furnace body of the electric furnace and where the auxiliary burner is attached, and A large number of supply pipes for flame fuel, cooling water, and the like are connected to various connectors provided in correspondence with each other. Therefore, it is a complicated and narrow environment in which various structures and members are complicated, and such an environment is the number of auxiliary burners to be installed (3 to 7 in general, although it varies depending on the electric furnace, Or more)
Therefore, the same number exists around the electric furnace.

For these reasons, various maintenance work for the electric furnace, not to mention the auxiliary burner itself, is troublesome and difficult to perform. In particular, cooling water is supplied not only to auxiliary burners and sleeves, but also to the water-cooled panels used as linings in the attached furnace walls. Therefore, each of the auxiliary combustion burner, sleeve, and water-cooled panel requires cooling water piping, and the piping is in a more intricately entangled state. When trying to do so, it was extremely troublesome and difficult (including the work of attaching and detaching the piping portion that does not require maintenance).

As described above, the cooling water pipe is complicated, and naturally, the structure adopted in each part for receiving the cooling water is not so simple. However, the cooling effect on the auxiliary combustion burner is not yet sufficient.For example, when bumping, excessive temperature rise, etc. occur in the furnace, melting loss may occur near the tip of the auxiliary combustion burner. It was On the other hand, in this type of electric furnace, today, of course, there is a strong demand for downsizing of the entire equipment in terms of structure, capital investment, running cost (using energy), and development toward the realization of these requirements. Is being continued.

The present invention has been made in view of the above circumstances, and various kinds of maintenance work can be easily and quickly performed on the auxiliary combustion burner itself and the entire electric furnace including the auxiliary combustion burner, and the cooling in the auxiliary combustion burner is also possible. It is an object of the present invention to provide an auxiliary burner and a water-cooled panel for an electric furnace, which can further secure the above-mentioned characteristics, and can further reduce the size of the electric furnace in terms of structure, capital investment, and running cost.

[0009]

In order to achieve the above object, the present invention takes the following means. That is, the auxiliary combustion burner for an electric furnace according to the present invention is a burner structure for the burner main body provided on the furnace wall of the electric furnace from the outside of the furnace toward the inside of the furnace to the flame fuel supply port, header and nozzle hole. A hole is provided therethrough. In addition, a space is formed in the burner body so as to surround the burner structure hole, and a cooling water channel is provided in this space.

In the auxiliary burner according to the present invention,
The cooling water passage formed by the space in the burner body causes a cooling water flow along the surface direction of the furnace wall. A plurality of burner structure holes can be provided in proximity to each other for gas or oil or oxygen, but in such a case, cooling is also performed between these burner structure holes. It is preferable that a water channel is formed so that a cooling water flow along the surface direction of the furnace wall also occurs in this portion.

When the cooling water flow is generated along the surface direction of the furnace wall in this way, the cooling effect can be enhanced around the structural hole for the burner, particularly in the portion of the furnace wall corresponding to the inside of the furnace. it can. Therefore, the auxiliary burner can reliably prevent melting loss. Such a burner body can be formed with a panel configuration that matches a water cooled panel used as a lining for the furnace wall. In this case, the cooling water channel provided inside the burner body is
It suffices that the burner main body is developed inside the entire panel shape, and the burner main body can be used as a water cooling panel as it is.

That is, since the auxiliary combustion burner thus formed is also integrated with the water-cooled panel, the auxiliary combustion burner is conventionally formed separately, and a sleeve is also provided for the auxiliary combustion burner. Compared with what was required, the structure was dramatically simplified and compacted. Moreover, since the internal structure and piping structure for cooling are shared between the auxiliary burner and the water-cooled panel, the simplification and compactness of the structure have been further promoted. There is.

On the other hand, the water-cooled panel for an electric furnace according to the present invention is a water-cooled panel in which the auxiliary combustion burner and the water-cooled panel are integrated as described above. That is, it is used as an inner wall of a furnace wall in an electric furnace, and a burner structure hole extending from the furnace outer side to the furnace inner side to a flame fuel supply port, a header and a nozzle hole penetrates the entire panel thickness. It is provided, and the flame fuel is supplied to the supply port.

In order to form the cooling water channel inside the panel, the space formed by expanding the entire panel form may be appropriately partitioned by the partition ribs. In this case, the burner structure hole is formed. By utilizing the formation position of the intermediate partition rib, the thickness of the intermediate partition rib may be formed from the outside of the furnace toward the inside of the furnace. By doing so, the partition ribs have the effect of increasing the panel strength, and at the same time, it is possible to form the cooling water channel by effectively utilizing the panel internal space as much as possible.

In addition to the burner structure hole, a lance structure hole for supplying a gas other than flame fuel from the outside of the furnace to the inside of the furnace, and a supply hole for supplying powder are provided. it can.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of an auxiliary combustion burner 1 according to the present invention, and FIGS.
Shows an example of an electric furnace 2 equipped with this auxiliary combustion burner 1. In this electric furnace 2, the furnace wall 5 of the furnace body 3 has a structure in which a plurality of metallic water cooling panels 6 are lined inside the furnace. And, some of the water-cooled panels 6 arranged in a predetermined direction in the circumferential direction are implemented as the auxiliary combustion burner 1 according to the present invention (in FIG. 5, a total of seven water-cooled panels 6 constitute the auxiliary combustion burner 1). Exist).

That is, as is clear from this description, the auxiliary burner 1 according to the present invention is also integrated with the water cooling panel 6. Further, as shown in FIGS. 1 and 2, the auxiliary combustion burner 1 has a burner body 7 formed in a panel shape in accordance with the water cooling panel 6, and the furnace wall 5 is inserted through the burner body 7. The burner body 7 is connected to the flame fuel supply pipes 10 and 11 (see FIG. 6). The burner body 7 is a metal casting made of copper or the like, and reinforcing ribs 14 are provided in a lattice pattern on the back surface side thereof (see FIGS. 1 and 3).
A predetermined panel thickness is ensured including the amount of protrusion.

The interior of the burner body 7 is formed as a space that extends over substantially the entire panel shape, and the interior of this space is partitioned by partition ribs 15 to allow cooling water to flow in one direction. Cooling water channel 1
6 has been formed. As shown in FIG.
In this embodiment, the partition ribs 15 are linear walls extending in the left-right direction and are arranged at predetermined intervals in the up-down direction, and the upper and lower partition ribs 15 each have a left end side. The cooling water passages 16 are connected in a meandering manner as a whole by making only the non-contacting portions to be the passage forming portions 17a and only the right end side not being the abutting portions to be the passage forming portions 17b. It is designed to have a water channel shape.

As shown in FIG. 3, on the back surface of the burner main body 7, a water supply port 20 and a drainage port 21 are arranged vertically adjacent to one vertical side (referred to as the left side in FIG. 3). Is provided. Of these, the water supply port portion 20 is adapted to communicate with the above-described cooling water passage 16 via a primary side opening 22 positioned at the lower end side of the burner body 7.
Further, the drainage port portion 21 communicates with the cooling water passage 16 through a secondary side opening 23 positioned on the upper end side of the burner body 7.

That is, when a water supply pipe (not shown) is connected to the water supply port 20 and a drain pipe (not shown) is connected to the water discharge port 21 to supply cooling water from the water supply pipe, the inside of the cooling water passage 16 is primary. The cooling water flows unidirectionally from the side opening 22 to the secondary side opening 23, whereby the entire burner body 7 is cooled. So this is
This means that this auxiliary combustion burner 1 can also be used as it is as a water cooling panel 6 for the furnace body 3. On the other hand, as shown in FIG. 2, a first burner structure hole 25 and a second burner structure hole 26 are provided in a substantially central portion of the burner body 7, and a lance is provided near the lower side of the burner body 7. The structure structure hole 27 is provided, and further, the powder supply hole 28 is provided near one vertical side of the burner body 7 (on the side opposite to the vertical side where the water supply port 20 and the drainage port 21 are provided). There is.

The first burner structural hole 25 is for ejecting flame fuel such as gas or oil into the furnace. The first burner structure hole 25 is formed so as to penetrate the entire panel thickness of the burner main body 7 in such a manner that the supply port 31, the header 32 and the nozzle hole 33 communicate with each other from the outside of the furnace toward the inside of the furnace. . The supply port 31 is formed by piercing the inside of a boss portion 34 projecting from the back surface of the burner body 7, and the header 32 and the nozzle hole 33 are provided with the header 32 and the nozzle hole 33. It is formed by making use of the forming position so as to pierce the middle partition rib 15 through its thickness. The above-described flame fuel supply pipe 10 (see FIG. 6) is connected to the supply port 31.

On the other hand, the second burner structural hole 26
Is for ejecting oxygen as an auxiliary combustion gas, which is mixed with the gas and oil ejected from the first burner structure hole 25 into the furnace. Of course, this oxygen is also one of the flame fuels. The structure of the second burner structure hole 26 is substantially the same as that of the first burner structure hole 25, and has a supply port 36, a header 37 and a nozzle hole 38, and the supply port 36 is inside the boss portion 34. A header 37 and a nozzle hole 38 are formed in the partition rib 15. The above-mentioned flame fuel supply pipe 11 (see FIG. 6) is connected to the supply port 36.

In this embodiment, in the second burner structure hole 26, there is one supply port 36 and a plurality of nozzle holes 38 (six holes in total). The nozzle holes 38 are arranged in the first burner structure holes 25.
The nozzle hole 33 is surrounded by the nozzle hole 33 in the vicinity of the nozzle hole 33. Therefore, for this purpose, the header 37 of the second burner structure hole 26 is formed in an annular shape (see FIG. 3) so that oxygen can be simultaneously supplied to all the nozzle holes 38. .

The lance structure hole 27 is for ejecting oxygen into the furnace, if necessary, separately from the flame fuel. The structure itself of the lance structure hole 27 is substantially the same as that of the first and second burner structure holes 25 and 26, and the supply port 40, the header 41, and the nozzle hole 42.
The supply port 40 is formed in the dedicated boss portion 43, and the header 41 and the nozzle hole 42 are formed in the partition rib 15. Then, the oxygen supply pipe 45 (see FIG. 6) is connected to the supply port 40.

In this embodiment, the lance structure hole 27 is used.
Also, the supply port 40 is only one place and the nozzle hole 42
Is assumed to be plural (three in total). The nozzle holes 42 are arranged in a line in the left-right direction near the lower side of the burner body 7. Therefore, for this purpose, the header 41 of the lance structure hole 27 is formed in a rectangular shape that is long in the left-right direction so that oxygen can be simultaneously supplied to all the nozzle holes 42.

As described above, in forming the first and second burner structure holes 25 and 26 and the lance structure hole 27, a structure portion for them is purposely added in the burner body 7. Instead of using the partition ribs 15, it is possible to utilize the space inside the panel as effectively as possible to form the cooling water passages 16 as is clear from FIG. The powder supply hole 28 is for supplying powder of carbon, aluminum ash, waste plastic, or the like into the furnace as needed. The powder supply hole 28 is provided so as to penetrate the burner body 7 by providing a portion that does not form a space (cooling water passage 16) in the burner body 7. A powder supply nozzle (not shown) penetrates through the powder supply hole 28 from the back side of the burner body 7 to the front side.

As is clear from these explanations,
In the internal space of the burner body 7, the first burner structure hole 25, the second burner structure hole 26, the lance structure hole 27, and the powder supply hole 28 are cooled so as to surround them. A waterway 16 is formed. Above all, it is worth noting that the cooling water passage 16 is formed between the first and second burner structure holes 25 and 26. In the electric furnace 2 (see FIG. 4) having such a configuration, the furnace body 3 is covered with the furnace lid 50,
While generating an arc from a plurality of electrodes 51 that can be lifted up and down, a flame fuel such as gas or oil is blown into the furnace from the first burner structural hole 25, and this is generated as a burner flame, If necessary, oxygen as an auxiliary combustion gas is blown out from the second burner structure hole 26 to raise the temperature of the burner flame.

In this case, in the auxiliary combustion burner 1, the cooling water flows unidirectionally from the primary side opening 22 to the secondary side opening 23 within the burner body 7 (cooling water passage 16). Since the cooling water flow is along the surface direction of the furnace wall 5, the auxiliary combustion burner 1 itself acts as a water cooling panel, and the surroundings of the first and second burner structural holes 25, 26 and A cooling water flow along the surface direction of the furnace wall 5 is generated also in the mutual portion, so that the auxiliary combustion burner 1 can also obtain a highly efficient cooling effect.

Therefore, the auxiliary burner 1 can surely prevent melting damage. It should be noted that, for example, after scrap melt-down, oxygen is blown from the lance structure hole 27 toward the flat bath in the furnace at a high pressure to oxidize and refine molten steel, or to supply powder powder. Powder such as carbon, aluminum ash, waste plastic, etc. can be supplied into the furnace from a powder supply nozzle (not shown) inserted into 28. Of course, it is also possible to supply the powder into the furnace through the powder supply hole 28 and simultaneously blow oxygen from the lance structure hole 27. In this case, since the auxiliary combustion burner 1 according to the present invention is entirely in the form of a panel, it is possible to position the structural hole 27 for the lance in the vertical direction to the lowest possible level, and as a result, this lance Since the structural hole 27 is vertically adjacent to the powder supply hole 28, there is an advantage that the combustion reaction of the powder can be efficiently performed and the heat can be effectively generated. is there.

By the way, the present invention is not limited to the above-mentioned embodiments, but can be appropriately modified according to the embodiments. For example, the number of the burner structure holes (the first burner structure hole 25, the second burner structure hole 26) is not particularly limited. In the burner structure hole, at least the nozzle hole may be provided obliquely downward in the furnace or obliquely tangentially in accordance with the scrap rotation direction. In addition, the headers 32 and 37 can be omitted in some cases.

The formation pattern of the cooling water passage 16 is not limited to the above embodiment.

[0032]

As is apparent from the above description, in the present invention, when viewed as an auxiliary combustion burner, the burner body is made thicker by adopting a cooling water passage that causes a cooling water flow along the surface direction of the furnace wall. A high cooling effect can be obtained with respect to the burner structure hole provided penetrating in the vertical direction, and the melting loss can be reliably prevented. Further, by forming the burner body into a panel shape that matches the water-cooling panel used as the lining of the furnace wall, the water-cooling panel can also be integrated. Therefore, compared to the conventional structure where the auxiliary burner and the water cooling panel were separately formed, and a sleeve was also required for this auxiliary burner, it was possible to dramatically simplify the structure and make it more compact. There is.

When viewed as a water-cooled panel for an electric furnace, the present invention simplifies the structure by integrally providing an auxiliary combustion burner, and the common internal structure for cooling and piping structure. It can be made compact. Therefore, various maintenance work for the entire electric furnace (including, of course, those for the auxiliary burner and the water-cooled panel) can be performed easily and quickly. Of course, the electric furnace can be made compact in terms of structure, capital investment, and running cost.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 2 is a front view showing an embodiment of an auxiliary combustion burner according to the present invention.

FIG. 3 is a rear view corresponding to FIG.

FIG. 4 is a partially cutaway front view of an electric furnace equipped with an auxiliary combustion burner according to the present invention.

FIG. 5 is a plan view corresponding to FIG. 4 with the furnace lid omitted.

6 is an enlarged cross-sectional view taken along the line BB of FIG.

[Explanation of symbols]

1 auxiliary burner 2 electric furnace 5 furnace wall 6 water cooling panel 7 Burner body 15 Partition ribs 16 cooling channels 25 burner structure hole (first burner structure hole) 26 Structural hole for burner (second structural hole for burner) 27 Structural hole for lance 28 powder supply hole 31 Supply port of the structural hole for the first burner 32 Header of structural hole for 1st burner 33 Nozzle hole of the structure hole for the first burner 36 Supply port of the structural hole for the second burner 37 Structural burner header for secondary burner 38 Nozzle hole of the structural hole for the second burner

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F27D 7/02 F27D 7/02 A

Claims (7)

[Claims] 1. A flame fuel supply port (31), a header (32) and a burner body (7) provided on a furnace wall (5) of an electric furnace (2) from the outside of the furnace toward the inside of the furnace. A burner structure hole (25) reaching the nozzle hole (33) is provided so as to penetrate therethrough, and the burner structure hole (2) is also provided.
5) For an electric furnace, characterized in that a space surrounding the periphery of (5) is formed, and a cooling water channel (16) for generating a cooling water flow along the surface direction of the furnace wall (5) is provided in the space. Burning burner. 2. The burner body (7) is provided with a plurality of burner structure holes (25, 26) in close proximity to each other, and the cooling water passage (16) is provided with these burner structure holes (25, 26). The auxiliary burner for an electric furnace according to claim 1, wherein the auxiliary combustion burners are formed so as to generate a cooling water flow along the surface direction of the furnace wall (5) also between the two (26). 3. The burner body (7) comprises a furnace wall (5).
The water cooling panel (6) is formed as it has a panel form adapted to the water cooling panel (6) used as the inner lining of the panel, and the cooling water channel (16) provided inside is spread over the entire inside of the panel form. ) Is also used as the auxiliary burner for an electric furnace according to claim 1 or 2. 4. A water cooling panel for an electric furnace used as a lining for a furnace wall (5) in an electric furnace, wherein a flame fuel supply port (31), a header (32) and a nozzle hole are provided from the outside of the furnace toward the inside of the furnace. A burner structural hole (25) reaching (33) is provided through the entire thickness of the panel, and by supplying flame fuel to the supply port (31), an auxiliary combustion burner (1) for an electric furnace can also be configured. A water-cooled panel for electric furnaces. 5. A space is formed inside the panel, which extends over substantially the entire panel shape, and the space is partitioned by partition ribs (15) so that the furnace walls are provided between the partition ribs (15). A cooling water channel (16) for generating a cooling water flow along the surface direction of (5) is formed, and the burner structure hole (25) utilizes the formation position of the partition rib (15). Then the partition rib (15)
The water-cooled panel for an electric furnace according to claim 4, wherein the inside of the wall is formed from the outside of the furnace toward the inside of the furnace. 6. Separated from the burner structural hole (25), a lance structural hole (27) for supplying a gas other than flame fuel from outside the furnace to the inside of the furnace penetrates the entire thickness of the panel. It is provided, The water-cooled panel for electric furnaces of Claim 4 or Claim 5 characterized by the above-mentioned. 7. Separate from the burner structure hole (25), a supply hole (28) for supplying powder from the outside of the furnace to the inside of the furnace is provided through the entire thickness of the panel. A water-cooled panel for an electric furnace according to any one of claims 4 to 6.