KR20090099080A - Burner device - Google Patents

Abstract

The invention relates, in particular, to a burner device 1 for heating or warming a casting flow protection device and / or an immersion casting device of a continuous casting plant. The burner device 1 of the present application comprises a container 5 having a bottom 6 and a lid 7, in particular capable of receiving a shroud tube or immersion tube, the wall part of the container 5 being 8 is formed by at least one porous burner.

Description

Burner device {BURNER ARRANGEMENT}

The present invention relates in particular to a burner device for heating or warming the casting flow protection device and / or the dip casting device of a continuous casting plant.

In a melting process, such as in a steel mill with a continuous casting plant, for example, the molten liquid metal is usually moved by a ladle to the casting stand of the continuous casting plant. Molten metal then flows into the tundish from the ladle through a casting flow protection such as, for example, a shroud tube. The metal flows from the tundish through an immersion casting, such as an immersion tube, into the casting die of a continuous casting plant. Immersion pipes and, in some cases, shroud pipes, are preheated before casting commencement and are not normally preheated during casting operation. For heating, the burners are operated with fossil fuels such as natural gas and oxygen carriers such as air. At this time, burners sold in the market are usually used. This burner heats a vessel in which a dip tube or shroud tube is disposed. In a further known example, a burner is used that heats the shroud tube or dip tube directly with flame in conditions where the vessel is not intervened.

The use of a commercially available burner with a flame generating unit produces a fast moving exhaust gas, which causes layer formation when preheating or heating between dip tubes or shrouds, and generates a low proportion of radiant energy as a whole. Hold. In addition, the shroud tube or dip tube to be heated by the flame is heated only in the form of dots, which can cause local overheating where the flame directly touches the tube, whereas in other areas the flame is too far away. Too weakly heated Doing so causes stress inside the dip tube or shroud tube, which leads to the formation of cracks and thus to the failure of the entire plant. In addition, by preheating with the flame of a commercial burner, the energy consumption is very high, and the CO ₂ emission is also very high. As a result, the cost of energy preparation is high, which makes the plant uneconomical, in addition, the emissions of combustion emissions are very high and reduce the overall environmental friendliness, which in turn is considered to be particularly negative in the discussion of the greenhouse effect. do.

Such burners are known, for example, from JP 61262455 A, EP 0 775 543 B1, EP 0 495 764 B1 and KR 1020050114398 A.

In addition, electric heating devices are known from JP 10118746 and DE 196 51 533 C2. However, the electric heating device has the disadvantage that the efficiency is not particularly desirable, whereby the primary energy consumption is relatively high, and therefore the method is very uneconomical.

It is an object of the present invention to improve the utilization of energy used, to reduce CO ₂ emissions, and to reduce the use of energy, especially in burner devices for heating or warming casting flow protection devices and / or dip casting devices in continuous casting plants. It is to provide the burner device to achieve high availability. It is also an object of the present invention to provide a method for preferably controlling the burner device.

The above object with respect to the burner device is in particular a burner device for heating or warming the casting flow protection device and / or the immersion casting device of a continuous casting plant, in particular with a container capable of receiving shroud pipes or immersion pipes. The wall portion of the container is achieved by the burner device which is at least partly formed by at least one porous burner.

According to the invention preferably the porous burner preferably comprises a plurality of porous burner segments. These porous burner segments are connected to each other to form a porous burner, or as one part or integrally formed.

Further, the porous burner segments of the porous burner preferably form rings and / or rows when viewed in the axial direction. Also, the porous burner preferably consists of porous burner segments, the plurality of segments forming rings or rows when viewed in the circumferential direction. Suitably for one embodiment of the invention, the porous burner segments of the porous burner are arranged in a hexagonal or octagonal form when viewed in the circumferential direction.

In addition, the container preferably comprises a bottom part and / or a lid part, which bottom part and / or lid part is composed of a bottom side plate and / or a lid side plate.

Furthermore, in connection with the construction of the burner device, the porous burner segments are preferably each fueled by the transfer lines from the outside, in particular in the radial direction. For this purpose, the conveying lines are guided radially outwardly from the segments and in some cases extend axially in the further conveying line section.

With regard to the fuel supply, at least a few of the transfer lines are preferably fueled via a common supply line. Suitably here, the supply line to the supply lines are formed essentially in a ring shape and can be connected with the conveying lines. The ring here does not need to be completely sealed, and the ring may also be preferably closed.

The object associated with the method for controlling the burner device is achieved by starting or shutting off the porous burner segments depending on the desired heating intensity or heating output. In this case, segments, preferably at least alternately distributed at the outer periphery of the porous burner, are activated or deactivated. By doing so, it is advantageously possible to achieve that the actuated segments and the deactivated segments are evenly distributed over the outer edge. Further, suitably the segments arranged in the adjacent rings or rows spaced apart from each other as rings or rows of the porous burner segments, as viewed in the axial direction of the porous burner, are activated or deactivated. By doing so, it can be achieved that the actuated and deactivated segments are evenly distributed over the axial length of the burner device.

Further preferred embodiments are described in the dependent claims.

In the following the invention is explained in more detail on the basis of an embodiment according to the drawings.

1 is a longitudinal cross-sectional view showing the burner device according to the invention of the immersion tube cut in the vertical direction.

2 is a cross-sectional view showing the burner device according to the invention of the immersion tube cut in the horizontal direction.

3 is a longitudinal cross-sectional view showing the burner device according to the invention of the immersion tube cut in the vertical direction.

4 is a cross-sectional view showing the burner device according to the invention of the immersion tube cut in the horizontal direction.

<Description of Drawing>

1: burner device

2: immersion tube

3: burner

3a: segment

3b: segment

3c: segment

3d: segment

4: conveying line

5: container

6: bottom, bottom plate

7: cover part, cover side plate

8: wall

9: exhaust gas flow

10: heat radiation

11: shroud tube

21: burner device

1 shows a burner device 1, in particular in longitudinal section, in particular for heating or keeping warm the casting flow protection device and / or the dip casting device of a continuous casting plant. The burner device 1 here comprises a burner 3 arranged around the immersion tube 2, which burner is formed as a porous burner according to the invention. In this regard, the porous burner, as a gas burner, possesses the desirable property of allowing combustion of the gas-air mixer in a porous structure or cell that functions with little or no sparking. As a result, flameless volume combustion of the gas-air mixer is achieved. The combustion in the porous structure is thereby achieved, so that the exhaust gas stream as a reaction product is produced at the outlet side after the inlet of the gas-air mixer.

The porous burner 3 shown in FIG. 1 is composed of a plurality of segments. The individual segments 3a, 3b, 3c, 3d are arranged in the axial direction of the dip tube, each of which comprises its own transfer line 4 of the fuel, oxygen carrier or fuel-air mixer, or each of the segments It includes separate transfer lines for oxygen carriers such as fuel and air. In addition, air or oxygen may be introduced or injected into the porous burner through the blower.

Further, the dip tube is preferably arranged in a thermally insulated vessel 5, which is preferably formed by two plates 6, 7 on the bottom side and the lid side, and the wall part 8 at its own outer periphery. ) Is formed by the segments 3a, 3b, 3c, 3d of the porous burner 3. For this purpose, the segments are arranged side by side with a slight joint gap between them, so that the perforated burners are arranged in multi-row form on average.

As shown in FIG. 2, the segments 3a, 3b, 3c, 3d of the porous burner 3 are arranged essentially ring-shaped, hexagonal or octagonal around the dip tube 2. Doing so constitutes a nearly tubular arrangement of the porous burner segments about the dip tube.

The porous burner 3 generates a hot exhaust gas stream 9 and thermal radiation 10 reaching the immersion tube in order to heat, preheat or set the immersion tube to a predetermined temperature. The hot exhaust gas here enters the combustion chamber inside the vessel 5 at a relatively low rate, which inhibits layer formation while allowing a uniform temperature distribution inside the vessel 5. In addition, the high proportion of energy is converted into radiant energy, so that the dip tube can likewise be heated very well.

Particularly preferably the porous burners are formed so that they can be arranged essentially in a ring or tubular configuration, which arrangement consists of a few segments of the porous burners. Doing so preferably controls the control of the fact that a few segments, or a few rows or segments of segments, start or shut off independently of each other, or that a few segments start or shut off independently of each other. Can be executed.

Depending on the heating intensity or heating output to be performed here respectively, all the porous burner segments can be started or a few of the segments can be shut off. Preferably segments that are at least alternately distributed around can be activated or deactivated. Further, preferably, segments arranged in a ring shape when viewed in the axial direction of the dip tube may be alternately started or shut down.

3 and 4 show an embodiment in which the shroud tube 20 is equipped with a burner device 21 according to the invention.

Claims (13)

A burner device 1, in particular for heating or keeping warm the casting flow protection device and / or the immersion casting device, in particular of the continuous casting plant, in particular the burner comprising a shroud 5 or a container 5 capable of receiving a dip pipe. Burner device according to claim 1, characterized in that the wall part (8) of the container (5) is at least partially formed by at least one porous burner (3) or comprises a porous burner (3). 2. Burner device according to claim 1, characterized in that the porous burner comprises porous burner segments (3a, 3b, 3c, 3d). 3. Burner device according to claim 2, characterized in that the porous burner segments (3a, 3b, 3c, 3d) of the porous burners form rings and / or rows when viewed in the axial direction. 4. The burner according to claim 2 or 3, wherein the porous burner consists of porous burner segments 3a, 3b, 3c and 3d, wherein the plurality of segments form a ring or a row when viewed in the circumferential direction. Device. 5. Burner device according to claim 4, characterized in that the porous burner segments (3a, 3b, 3c, 3d) of the porous burner are arranged in a hexagonal or octagonal view in the circumferential direction. The container (5) according to claim 1, wherein the container (5) comprises a bottom part (6) and a cover part (7), and the bottom part (6) and / or the cover part (7). Burner device, characterized in that consisting of a bottom side plate and / or a lid side plate. 7. Burner device according to one of the preceding claims, characterized in that the container (5), preferably the lid (7), comprises an opening for discharging the exhaust gas. 8. The porous burner segments 3a, 3b, 3c and 3d are each fueled from the outside by means of a transfer line 4, in particular in the radial direction. Burner device. 9. Burner device according to one of the preceding claims, characterized in that at least a few of the transfer lines (4) are supplied with fuel via a common supply line. 10. The burner device according to any one of claims 1 to 9, wherein the supply line is formed in a ring shape and connected to the conveying lines. 11. A method for controlling a burner device according to any one of claims 1 to 10, wherein the porous burner segments 3a, 3b, 3c, 3d are activated or deactivated depending on the desired heating intensity or heating output. Control method characterized in that. 11. A method for controlling a burner device according to any of the preceding claims, wherein the segments 3a, 3b, 3c, 3d, which are at least alternately distributed around the perforated burner, are activated or deactivated. Control method characterized in that. 11. A method for controlling a burner device according to any one of claims 1 to 10, comprising: another ring spaced adjacent or spaced apart as a ring or row of porous burner segments when viewed in the axial direction of the porous burner; Control method characterized in that the segments (3a, 3b, 3c, 3d) arranged in the row are activated or deactivated.

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