JP4125944B2 - Apparatus and method for preheating the inside of a ladle that temporarily receives molten metal - Google Patents

Description

[0001]
The present invention relates to an apparatus for preheating the inside of a ladle that temporarily receives metal melted in a blast furnace or the like by using combustion heat of a packaged combustor (burner) for heating a container such as a ladle. And a method .
[0002]
A container 100 such as a ladle shown in FIG. 8 is generally used for transporting hot metal taken out from a blast furnace or the like to the converter, or for ingot making of molten steel taken out from the converter etc. It is used for transportation to molds. Therefore, the container 100 such as a ladle is heated to the melting temperature of the metal before the molten metal is added so that the molten metal which is high temperature does not cause thermal distortion. It is necessary to raise the temperature.
[0003]
As a technique related to a technique for preheating the inside of a container such as a ladle, in FIG. 9, a partition wall 410 is fitted in an inverted frustoconical container 400, and the bottom of the second chamber 400 b is formed by a single burner 420. The structure which heats only and raises the temperature of the 1st chamber 400a by heat conduction is disclosed (refer patent document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-758 (Description of paragraph number 0009 (action), FIG. 4)
[0005]
[Problems to be solved by the invention]
However, in the configuration shown in FIG. 9, the container 400 such as a ladle needs to have an inverted frustoconical shape, and can only be applied to the container 400 such as a ladle used for special purposes. In addition, the partition wall 410 must be fitted into the container 400 such as a ladle, which may complicate the process of heating the container such as the ladle in advance.
[0006]
Conventionally, when a container 100 such as a ladle having a diameter of about 1 m and a depth of about 1 m is heated, the gas flows out from the tip of a single pipe-shaped burner as shown in FIG. The pipe-like burner tip 200 is guided into a container 100 such as a pan, and fuel is ejected from the pipe-like burner tip 200, whereby the burner tip A flame 300 was formed from the part 200 to heat the inside of the container 100 such as a ladle. In order to raise the temperature by heating the inside of the container 100 such as a ladle in this way, heating by such a so-called diffusion flame has been mainstream. In this case, since air is entrained and burned by the gas jet energy, it is impossible to seal the container 100 such as a ladle with a lid (plate) in the internal heating of the container 100 such as a ladle.
[0007]
The air for burning the fuel is partially sucked into the burner according to the combustion speed at the burner tip 200 or used for the diffusion of flame from the burner tip 200. Therefore, the high combustion temperature of 1600 ° C. that is normally obtained depending on the combustion state cannot be obtained, and only a temperature of about 1000 ° C. can be obtained. Therefore, the ultimate temperature required as the maximum temperature must be lowered. Further, conventionally, since the inside of the container 100 such as a ladle is heated without the lid (plate) of the container 100 such as a ladle, air is freely released from the open portion 100a of the container 100 such as the ladle. Since it was able to enter and exit, a long time was required until the temperature in the container 100 such as a ladle became uniform.
[0008]
Moreover, in order to burn the fuel, it is necessary in principle to enter and exit air from the open portion 100a. However, the pipe-shaped burner tip 200 is not attached to the container 100 such as a ladle without a lid (plate). Since it is directly placed in a container 100 such as a ladle, the open portion 100a that is not covered is large, energy loss from the open portion 100a increases, and the amount of fuel used must increase. Furthermore, there is heat radiation (heat loss) from the open portion 100a, which causes an increase in the ambient temperature of the container 100 such as a ladle, and the working environment temperature far exceeds room temperature, making it difficult to manage the health of the worker.
[0009]
The present invention has been made in view of the above circumstances, and uses a packaged combustor (burner) to heat a container such as a ladle with a lid to heat the inside of the container such as a ladle. It is an object of the present invention to provide an apparatus and a method for preheating the inside of a ladle that temporarily receives molten metal, which improves improvement, greatly reduces equipment costs, and improves work environment.
[0010]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 includes a ladle for temporarily receiving molten metal provided with an open portion which is a hot water inlet for pouring molten metal. A tip portion for releasing the combustion gas to send the combustion gas into the ladle, and a periphery of the tip portion, covering the open portion of the ladle, and positioning the tip portion A plate for carrying out and supplying air for burning the fuel at the tip and releasing the combustion gas, and for supplying air to the tip for moving the combustion gas by air Means, adjusting means for supplying or blocking the fuel supplied to the tip, ignition means for igniting the fuel supplied to the tip, and air blowing means The destination Supplied with detection either supply air is conducted to the parts, and monitoring means for detecting the ignition of the tip for delivering the combustion gas into the ladle, the fuel to the tip Control means for controlling or shutting off, and a control means for controlling the amount of air required for combustion of the fuel, and the combustor provided on the plate, the combustor extending to surround the periphery of the portion where the tip portion is incorporated, and guide to prevent short pass phenomenon, provided any site of the ladle, and an exhaust outlet for discharging the combustion gases from the ladle And an exhaust outlet for exhausting the combustion gas in the ladle provided in the plate, and preheating the inside of the ladle for temporarily receiving molten metal in the apparatus That.
[0011]
Therefore, according to the first aspect of the present invention, the tip portion for sending combustion gas, the blower as the blowing means, the electromagnetic shut-off valve as the fuel adjusting means, and the ignition transformer as the ignition means into the combustor. , Equipped with a monitoring device that is a monitoring means for ensuring the safety of the burner 1 and a control device that is a control means for controlling the burner 1, and since these are packaged, these are separated from the combustor Compared to the installation, it is possible to reduce the equipment cost, and since a plate is provided to cover the open part of the container such as the ladle, heat is generated when heating the container such as the ladle. Loss can be reduced.
[0012]
In addition, by providing a guide that extends around the peripheral portion where the tip of the combustor is incorporated, the combustion gas generated from the flame from the tip of the combustor can be moved in the direction secured by the guide. It is possible to lead to the bottom of a container such as a ladle and prevent a short pass phenomenon that diffuses the combustion gas.
[0013]
Furthermore, since any part of the container such as the ladle is provided with an exhaust outlet for discharging the combustion gas from the container such as the ladle, the combustion gas led to the bottom surface of the container such as the ladle. Is transmitted to the inner wall, and after the inner wall is heated, it can be discharged out of a container such as a ladle.
[0014]
Also, without limiting to a container such as a ladle, by providing an exhaust outlet for discharging the combustion gas in the container such as a ladle on the plate, the combustion gas introduced to the bottom surface of the container such as a ladle can be reduced. It is transmitted to the inner wall portion, and after the inner wall portion is heated, it can be discharged out of a container such as a ladle.
[0015]
The invention according to claim 2 is characterized in that the blower means and the control means in the combustor are connected to the tip of the combustor via a duct . It is an apparatus for preheating the inside of a ladle that temporarily receives molten metal .
[0016]
Therefore, according to the invention described in claim 2, since the blowing means and the control means in the combustor are connected to the tip of the combustor via the duct, the container such as the ladle and the combustor are separated. Even if it must be installed in a new place, it becomes possible to send the combustion gas to a container such as a ladle.
[0017]
Furthermore, the invention described in claim 3 is a hot water inlet for injecting molten metal using the apparatus for preheating the inside of the ladle that temporarily receives the molten metal according to claim 1. The step of heating the bottom surface of the ladle while the combustion gas that has reached the bottom surface of the ladle that temporarily receives the molten metal provided with the open portion is also heated the side surface of the ladle ; The apparatus for discharging the combustion gas from the ladle from an exhaust outlet provided at any part of the ladle and preheating the inside of the ladle that temporarily receives the molten metal according to claim 1. And a step of discharging the combustion gas in the ladle from an exhaust outlet provided on a plate of the combustor , wherein the inside of the ladle that temporarily receives the molten metal is preheated Is the method .
[0018]
Therefore, according to the third aspect of the present invention, the guide that extends around the peripheral portion where the front end of the combustor is incorporated is disposed in the container such as a ladle. Cover the open part of the container such as a ladle, supply air to burn the fuel at the tip of the combustor and release the combustion gas, ignite the fuel supplied to the tip of the combustor The combustion gas generated by the flame from the front end of the combustor is moved by the air along a guide extending around the peripheral portion where the front end of the combustor is incorporated, and the combustion reaches the bottom surface of a container such as a ladle The gas heats the bottom surface and also heats the inner wall portion, which is the side surface of a container such as a ladle.
[0019]
Since any part of the container such as a ladle is provided with an exhaust outlet for discharging the combustion gas from the container such as the ladle, the combustion gas led to the bottom of the container such as the ladle is inside. After reaching the wall and heating the inner wall, it can be discharged out of a container such as a ladle.
[0020]
Without being limited to a ladle or other container, by providing an exhaust outlet for discharging the combustion gas in the ladle or other container on the plate, the combustion gas introduced to the bottom of the ladle or other container is placed on the inner wall. It becomes possible to discharge to the outside of the container such as a ladle after the inner wall is heated .
[0021]
As described above, since the exhaust is discharged from the exhaust outlet, it is possible to eliminate heat radiation from the open portion of the ladle container and the short path in which the flow of the combustion gas directly proceeds toward the exhaust outlet. The phenomenon can be prevented, and a container such as a ladle can be heated to a high temperature in a short time.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
(Example 1)
1 and 2 show a heating device 5 for heating a container 3 such as a ladle according to Example 1 of the present invention. The burner 1 that is a combustor includes a burner tip 1a that is a single tip for sending combustion gas to a container 3 such as a pan, a blower that is a blower, and an electromagnetic shut-off valve that is a fuel adjuster. And an ignition transformer as an ignition means, a monitoring device as a monitoring means for ensuring the safety of the burner 1, and a control device as a control means for controlling the burner 1. Devices other than the tip of the burner 1 are incorporated in the burner 1 and packaged, and are not shown in the drawing.
[0024]
In the blower, air is supplied to burn the fuel at the burner tip 1a provided at the end of the burner 1 to release the combustion gas, and the combustion gas is moved in the container 3 such as a ladle by the air. Then, air is supplied to the burner tip 1a. In addition, the electromagnetic shut-off valve performs adjustment for supplying or shutting off the fuel supplied to the burner tip 1a. The ignition transformer performs ignition for igniting the fuel supplied to the burner tip 1a. The monitoring device detects whether air is supplied to the burner tip 1a by the blower and performs monitoring for detecting ignition of the burner tip 1a in order to send combustion gas into the container. Become. Furthermore, in the control device, the supply of fuel to the burner tip 1a or the cutoff thereof is controlled, and the amount of air necessary for fuel combustion is controlled. Further, fuel and air for burning the fuel are sent to the burner tip 1a, and a flame 8 for burning fuel gas is emitted from the burner tip 1a.
[0025]
A burner mounting plate 2 that is a plate is attached around the burner tip 1a, and the size of the burner mounting plate 2 covers an opening 3a that is an open portion of a container 3 such as a ladle. It is a size that can be done. In addition, a guide 2a extending around a portion where the burner tip 1a is incorporated in the burner mounting plate 2 is provided. An opening 3a of a container 3 such as a ladle covered with the burner mounting plate 2 has a predetermined size capable of pouring molten metal as a hot water inlet. An exhaust outlet 3b for discharging combustion (exhaust) gas is provided on a side surface which is any part of the container 3 such as a ladle, and the exhaust outlet 3b also functions as a hot water outlet. .
[0026]
As shown in FIG. 2, when the burner 1 and the burner mounting plate 2 are attached so as to cover the opening 3a that is an open portion of the container 3 such as a ladle, the guide 2a extends to the vicinity of the bottom surface 3c of the container 3 such as the ladle. It will be. The container 3 such as a ladle is sealed by attaching the burner mounting plate 2. Operation | movement of the heating apparatus 5 for heating containers, such as a ladle demonstrated above in this state, is demonstrated using FIG. First, when the burner 1 is operated, fuel is supplied from the burner 1 to the burner tip 1a. At this time, it is confirmed that the supply gas pressure is normal (step S0), and the operation signal of the operation switch is turned “ON” (step S1). Necessary air is sent from the air blower to the burner tip 1a (air blowing about 35 seconds) (step S2). Next, it is determined by the monitoring device whether or not the pressure of the blower is normal (step S3).
[0027]
When it is determined that the pressure of the blower is not normal, lockout occurs (step S10), the cause of the abnormal pressure of the blower is investigated, the cause is determined, and the cause is removed (step S11). Then, a manual reset switch is pressed (step S12), and the operation signal of the operation switch is turned “ON” again (step S1).
[0028]
When it is determined that the pressure of the blower is normal, the control device controls the ignition transformer to operate and the electromagnetic shut-off valve to adjust the fuel supply (step S4). And ignition to the burner front-end | tip part 1a is performed (step S5). Then, it is determined whether the flame 8 detection is normal (step S6).
[0029]
If it is determined that the flame 8 detection is not normal, the ignition is not ignited (step S9), the lockout occurs (step S10), the cause of the abnormal flame 8 detection is investigated, the cause is determined, the cause Is removed (step S11). Then, a manual reset switch is pressed (step S12), and the operation signal of the operation switch is turned “ON” again (step S1).
[0030]
If it is determined that the detection of the flame 8 is normal, the burner tip 1a burns the supplied fuel by the flame 8 to generate combustion gas (step S7). Moreover, the flame 8 from the burner front-end | tip part 1a is sent to the predetermined depth of containers 3, such as a ladle, by the control apparatus and the air blower. Along with this, the combustion gas generated by the flame 8 from the burner tip 1a moves in the direction secured by the guide 2a, and the combustion gas heats the bottom surface 3c of the container 3 such as a ladle. At this time, since the flame 8 from the burner tip 1a is along the guide 2a, the combustion gas generated from the flame 8 at the burner tip 1a does not diffuse and reliably reaches the bottom surface 3c. And the combustion gas from the flame 8 along the guide 2a heats the part of the bottom face 3c facing the guide 2a.
[0031]
When the part facing the guide 2a in the bottom surface 3c is heated, the temperature of the part rises. When the portion is heated by the combustion gas for a predetermined time, the heat spreads over the entire bottom surface 3c. As a result, the temperature of the entire bottom surface 3c increases, and the entire bottom surface 3c reaches a high temperature combustion temperature (generally about 1600 ° C.). Further, as the heating by the combustion gas generated from the flame 8 of the burner tip 1a continues, the combustion gas is transmitted from the bottom surface 3c to the inner wall portion 3d which is the side surface. At the same time, heat from the combustion gas is also transferred from the bottom surface 3c to the inner wall portion 3d (in the direction of the dotted arrow in FIG. 2). As the heating continues, the inner wall 3d reaches the high temperature combustion temperature (generally about 1600 ° C.) in the same manner as the bottom 3c. At this time, the combustion gas transmitted from the bottom surface 3c to the inner wall portion 3d is exhausted from the exhaust outlet 3b (indicated by the solid arrow in FIG. 2). Then, the operation signal of the operation switch of the heating device 5 is set to “OFF” (step S8).
[0032]
(Example 2)
FIG. 4 shows a heating device 15 for heating a container 3 such as a ladle according to Example 2 of the present invention. The basic configuration is the same as that of the embodiment shown in Example 1, and the same reference numerals as in Example 1 are attached to the same members as in Example 1. The configuration of Example 2 is that the burner body (blower and control device) 10 is installed apart from the burner tip 10a. For this reason, a duct 10c is provided between the burner body (blower and control device) 10 and the burner tip 10a to connect the burner body (blower and control device) 10 and the burner tip 10a.
[0033]
Specifically, as shown in FIGS. 4 and 5, one end of the duct 10c is connected to the blower and the control device which are the burner body 10, and the T-type duct 10d is connected to the other end of the duct 10c. is there. The T-shaped duct 10d is provided with a fuel receiving portion 10e for receiving fuel gas, and the fuel receiving portion 10e is connected to an electromagnetic cutoff valve 10b for cutting off the supply of fuel gas. A burner tip portion 10a is attached to the fuel receiving portion 10e. In this embodiment, the burner tip portion 10a enters a hole provided at a substantially central portion in the burner mounting plate 2.
[0034]
A guide 2a extending around a portion where the burner tip 10a is incorporated is provided on the burner mounting plate 2 which is another configuration, and combustion (exhaust) gas is discharged to the side surface of the container 3 such as a ladle. The fact that an exhaust outlet 3b is provided is the same as the configuration of Example 1. In order to operate the heating device 15 for heating the container 3 such as the ladle in the assembled state shown in FIG. 5, the opening 3a of the container 3 such as the ladle is covered with a plate (burner mounting plate 2). By heating the bottom portion 3c and the inner wall portion 3d with the combustion gas, the container 3 such as a ladle can reach a high temperature in a short time as in the case of Example 1.
[0035]
In Examples 1 and 2, which are the present embodiment, the exhaust outlet 3b is provided on the side surface of the container 3 such as a ladle. However, as shown in FIG. It is also possible to provide an exhaust outlet for discharging the combustion gas in the container 3 such as a pan. 6 (a) shows a configuration in which an exhaust outlet 2b is provided on the upper surface of the burner mounting plate 2, and the combustion gas from the guide 2a is shown in a dotted line in the container 3 such as a ladle. It is transmitted from the bottom surface 3 c to the inner wall portion 3 d, reaches the burner mounting plate 2, passes through the burner mounting plate 2, and reaches the exhaust outlet 2 b provided on the upper surface of the burner mounting plate 2.
[0036]
6 (b) shows a configuration in which an exhaust outlet 2b is provided on the side surface of the burner mounting plate 2, and the combustion gas from the guide 2a is transferred to a ladle or the like as in FIG. 6 (a). Is transmitted from the bottom surface 3c of the container 3 to the inner wall portion 3d, reaches the burner mounting plate 2, passes through the burner mounting plate 2, and reaches the exhaust outlet 2b provided on the side surface of the burner mounting plate 2. . Thus, even if the exhaust outlet 2b is provided at any part of the burner mounting plate 2, the combustion gas can be reliably discharged from the container 3 such as a ladle.
[0037]
【The invention's effect】
According to the present invention, a container such as a ladle is covered with a plate (burner mounting plate) in which a single burner (combustor) is attached, and the container such as a ladle is heated so that combustion by the burner is performed. Gas is not diffused and heating efficiency can be improved. Moreover, the moving direction of the combustion gas generated from the flame from the tip of the burner by the blower can be determined toward the bottom surface of the container such as a ladle by way of the guide, and the combustion gas due to the diffusion of the combustion gas is brought to the bottom surface. It is possible to prevent a so-called short path phenomenon in which the air travels directly toward the exhaust outlet without reaching. Furthermore, since the combustion gas directly reaches the bottom part of the container such as a ladle, the bottom part is sufficiently heated, and as a result, the entire container such as the ladle is heated in a short time to a high temperature ( High combustion temperature).
[0038]
Specifically, FIG. 7 shows the temperature (in-furnace temperature) of a container such as a ladle according to the heating time when the ladle preheating method with a lid according to the present invention and the conventional open-type ladle heating method are used. is there. As is clear from FIG. 7, it can be seen that the method of preheating a ladle with a lid according to the present invention increases the temperature in the furnace with respect to the heating time faster than the conventional open-type ladle heating method.
[0039]
A burner (combustor) attached to a burner mounting plate, which is a plate serving as a lid of a container such as a ladle, is packaged with a blower, an electromagnetic shut-off valve, a monitoring device, and a control device. ) And the equipment cost can be reduced as compared with the case of installing a blower or the like. Furthermore, since the burner mounting plate is attached to a container such as a ladle and the lid is covered, there is no heat dissipation (heat loss) from the open portion, and there is no increase in ambient temperature. As a result, the temperature of the work environment does not fluctuate and the work environment can be kept good, and the health management of the worker can be easily maintained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a state where a container heating apparatus according to Example 1 of the present invention is attached to a container.
FIG. 2 is a cross-sectional view showing a state where the container heating apparatus according to Example 1 of the present invention is attached to the container.
FIG. 3 is a flowchart showing an operating state of a burner in the container heating apparatus according to the present invention.
FIG. 4 is a cross-sectional view showing a state in which the container heating device according to Example 2 of the present invention is attached to the container.
FIG. 5 is a cross-sectional view showing a state in which the container heating device according to Example 2 of the present invention is attached to the container.
FIG. 6 is a cross-sectional view of a container heating apparatus according to the present invention in which an exhaust outlet is provided in a lid.
(A) is sectional drawing of the heating apparatus of the container which provided the exhaust outlet in the upper surface of the lid | cover.
(B) is sectional drawing of the heating apparatus of the container which provided the exhaust outlet in the side surface of the lid | cover.
FIG. 7 is a graph when the temperature is compared by heating a container such as a ladle using the ladle preheating method with a lid according to the present invention and the conventional open-type ladle heating method.
FIG. 8 is an explanatory view showing a conventional method for heating a container such as an open-type ladle.
FIG. 9 is an explanatory view showing a conventional method for heating a container such as an inverted frustoconical ladle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Burner, 1a ... Burner tip part, 2 ... Burner mounting plate, 2a ... Guide, 3 ... Container such as ladle, 3a ... Opening part, 3b ... Exhaust outlet, 5, 15, 25, 26 ... Heating device, 8 …flame,

Claims (3)

Provided with a ladle that temporarily receives molten metal, provided with an open portion that is a hot water inlet for pouring molten metal,
A tip for discharging the combustion gas to send the combustion gas into the ladle ;
A plate attached to the periphery of the tip, covering the open portion of the ladle, and positioning the tip;
Blowing means for supplying air to burn the fuel at the tip and release the combustion gas, and to supply air to the tip to move the combustion gas by air;
Adjusting means for supplying or blocking the fuel supplied to the tip portion;
Ignition means for igniting the fuel supplied to the tip portion;
Monitoring means for detecting whether air is being supplied to the tip by the blower and detecting ignition of the tip in order to send the combustion gas into the ladle ;
A combustor comprising: control means for controlling supply of or shutting off the fuel to the tip portion and controlling an amount of air necessary for combustion of the fuel;
A guide provided on the plate and extending around a peripheral portion where the tip of the combustor is incorporated to prevent a short path phenomenon ;
Provided in any portions of the ladle, and an exhaust outlet for discharging the combustion gases from the ladle,
Provided in said plate, said exhaust outlet for discharging the combustion gas in the ladle, characterized by comprising a molten metal preheated to devices inside the temporary receiving ladle . 2. The ladle for temporarily receiving molten metal according to claim 1, wherein the blower means and the control means in the combustor are connected to the tip of the combustor through a duct . A device that preheats the interior. The apparatus for heating the inside of the ladle that temporarily receives the molten metal according to claim 1, and provided with an open portion that is a hot water inlet for pouring the molten metal. together with the combustion gas which has reached the bottom of temporarily receiving ladle the metal heats the bottom of the ladle, a step of also heating the sides of the ladle,
The apparatus for discharging the combustion gas from the ladle from an exhaust outlet provided at any part of the ladle and preheating the inside of the ladle that temporarily receives the molten metal according to claim 1. And a step of discharging the combustion gas in the ladle from an exhaust outlet provided on a plate of the combustor , wherein the inside of the ladle that temporarily receives the molten metal is preheated Method.

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