JP2009160640A - Ladle preheating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ladle preheating device which can uniformly preheat the internal atmosphere of a hollow ladle. <P>SOLUTION: In the ladle preheating device 1 where a ladle 2 receiving a molten steel and carrying the same is provided with a ladle cover 4 clogging the opening part thereof 3, the ladle cover is fitted with a pair of heat storage type burners 5, 6 burning alternately for preheating the internal atmosphere of the hollow ladle, and the heat storage type burners are provided with burner nozzles 5a, 6a jetting flame f into the ladle, the pair of burner nozzles are provided on the positions at equal intervals from the center of the ladle cover to the radial direction, and further, the flame f is jetted from the center of the ladle cover toward the surface of the axis X taken down to the height direction for uniformly preheating the inside of the ladle. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a ladle preheating device that preheats the internal atmosphere of an empty ladle.

  In a ladle that receives and transports molten steel, a regenerative burner is generally used to preheat the internal atmosphere. The heat storage burner includes a heat storage body through which combustion air and combustion exhaust gas pass, and a main nozzle, and collects heat of the combustion exhaust gas from combustion by the heat storage body to serve as a preheating source of combustion air. For example, Patent Document 1 and Patent Document 2 are known for such a heat storage burner.

  Patent Document 1 shows a single heat storage burner, and the heat storage burner is provided with a plurality of heat storage bodies. Then, the heat storage body through which the combustion exhaust gas passes and the heat storage body through which the combustion air passes are switched at regular intervals, and the combustion air is heated with the heat recovered by the heat storage body through the passage of the combustion exhaust gas. .

  However, the capacity of a single-type regenerative burner is limited, and it has been difficult to adopt it for preheating work of a large ladle used in steel facilities. A pair of alternating combustion type heat storage burners is known as a means for solving such problems.

  Patent Document 2 shows a pair of alternating combustion type regenerative burners. In a heating operation stage of a molten metal container such as a ladle, a lid provided with the pair of regenerative burners is used to open an opening of the molten metal container. The nozzles of these regenerative burners are alternately covered at a fixed timing to inject and exhaust flames.

At this time, the main nozzles of the pair of heat storage burners are installed at a certain distance in the diameter direction from the center of the lid. Each main nozzle is opened downward. As a result, the flame of the regenerative burner is ejected in the vertical direction from the position eccentric from the center of the lid via the main nozzle.
JP 2001-27412 A Japanese Patent No. 3680252

  By the way, in the preheating work of the ladle by the alternating combustion of a pair of conventional regenerative burners, a flame is ejected vertically from the regenerative burner on the combustion side, so that the lower part side of the regenerative burner on the non-combustion side Compared to the above region, the region on the lower part side of the regenerative burner on the combustion side was heated to a high temperature.

  Further, since the pair of regenerative burners is an alternating combustion type, only one of the regenerative burners always burns, and the combustion side is switched at a constant interval. For this reason, there has been a problem that the region heated at a high temperature always fluctuates, the internal temperature of the molten metal container is not stable, and the internal atmosphere cannot be heated uniformly. In particular, in the preheating work of the ladle for transporting the received molten steel, it is necessary to keep the molten steel in a stable state, and there has been a problem of eliminating the temperature difference in the internal atmosphere.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a ladle preheating apparatus capable of uniformly preheating the internal atmosphere of an empty ladle.

  In the ladle preheating device according to the present invention, a ladle that closes the opening is provided in a ladle that receives and transports molten steel, and the ladle lid preheats the internal atmosphere of the empty ladle. In addition, a pair of regenerative burners that are alternately burned are attached, and the regenerator burner is provided with a burner nozzle that ejects flame into the ladle. In order to preheat the inside of the ladle uniformly, the flame is jetted from the center of the pan lid toward the axis line in the height direction in order to uniformly preheat the ladle. Features.

  The pair of heat storage burners are arranged symmetrically with respect to the center of the pan lid.

  The pair of heat storage burners are arranged so that the lengthwise sides thereof face each other.

  In the ladle preheating apparatus according to the present invention, the internal atmosphere of an empty ladle can be preheated uniformly.

  EMBODIMENT OF THE INVENTION Below, the suitable embodiment of the ladle preheating apparatus concerning this invention is described in detail with reference to an accompanying drawing. The ladle preheating device 1 according to the present embodiment is basically provided with a ladle lid 4 for closing the opening 3 in a ladle 2 that receives and transports molten steel as shown in FIGS. 1 to 4. In order to preheat the internal atmosphere of the empty ladle 2, a pair of right-side heat storage burners 5 and left-side heat storage burners 6 attached to the pot lid 4 are attached. In the ladle preheating device 1 provided with the burner nozzles 5a and 6a for ejecting the flame f into the ladle 2, the pair of burner nozzles 5a and 6a are provided at equal intervals in the diameter direction from the center C1 of the pan lid 4. At the same time, in order to preheat the inside of the ladle 2 uniformly, the flame f is ejected from the center C1 of the pan lid 4 toward the axis line X in the height direction.

  The pair of regenerative burners 5 and 6 are arranged point-symmetrically with respect to the center C <b> 1 of the pan lid 4.

  The ladle 2 that receives high-temperature molten steel and carries it to the next process is formed in a substantially planar shape, and an opening 3 through which the molten steel is taken in and out is formed above the ladle 2. The ladle 2 generally has a diameter of about 3 m and a depth of about 3.5 m, but the size of the ladle 2 is not limited to this, and may be larger or smaller.

  The ladle 2 is provided with a ladle lid 4 for closing the opening 3 so that the opening 3 can be opened and closed. On the upper surface of the pan lid 4, four wire holes 7 through which the wires W are inserted are provided at approximately equal intervals in the circumferential direction. The pan lid 4 in which the wire W is inserted into the wire hole 7 is opened and closed by hanging it with a crane or the like. Since the wire hole 7 should just be able to suspend the pan lid 4 with sufficient balance, it is not restricted to four places.

  On the upper surface of the pan lid 4, an alternating right heat storage burner 5 and a left heat storage burner 6 for preheating the internal atmosphere of the empty ladle 2 before receiving steel are attached.

  The heat storage burners 5 and 6 have burner nozzles 5a and 6a, communication passages 5b and 6b, and heat storage bodies 5c and 6c, respectively. Specifically, burner nozzles 5a and 6a for ejecting flame f are provided at the tips of the regenerative burners 5 and 6, and communication passages 5b and 6b are connected to the burner nozzles 5a and 6a toward the rear thereof. The And in the rear part side of the thermal storage type burners 5 and 6, the thermal storage bodies 5c and 6c which are connected to the communication paths 5b and 6b and through which combustion air and exhaust gas pass are provided.

  Although not shown, an air supply pipe that supplies combustion air and an exhaust pipe that discharges exhaust gas are connected to the rear of the heat accumulators 5c and 6c. The heat accumulators 5c and 6c are formed by accumulating, for example, a heat accumulating material having a honeycomb structure made of ceramic, or a plurality of ceramic spherical heat accumulating materials so that combustion air and exhaust gas can be circulated therein. It is constructed as a heavy object, such as an accumulated one or a plurality of accumulated ceramic pipes.

  The fuel supply pipe 8 is connected to the upper part of the burner nozzles 5a, 6a of the heat storage burners 5, 6. From the fuel supply pipe 8, fuel such as liquid or gas is supplied. A pilot burner (not shown) is provided inside the burner nozzles 5a and 6a, and the fuel is supplied by a fuel supplied from a primary fuel supply pipe (not shown) and air supplied from a primary air supply pipe (not shown). The next flame is always generated in the burner nozzles 5a and 6a. From the burner nozzles 5a and 6a of the regenerative burners 5 and 6, the ladle 2 is obtained by using the primary flame of a pilot burner (not shown) as an ignition source and the fuel and combustion air supplied through the fuel supply pipe 8. A flame f is ejected inward. The pilot burner need not be provided in the burner nozzles 5a and 6a, and may be provided in the vicinity of the burner nozzles 5a and 6a, for example.

  The regenerative burners 5 and 6 are alternately burned. For example, high-temperature exhaust gas from the combustion of the left-side heat storage burner 6 in the combustion state is sucked from the burner nozzle 5a of the right-side heat storage burner 5 in the non-combustion state, and the exhaust gas heats the heat storage body 5c via the communication passage 5b. The exhaust pipe is exhausted. When the right-side heat storage burner 5 is switched to the combustion state, the combustion air supplied from the air supply pipe is heated to a high temperature by passing through the heated heat storage body 5 c, and this and the fuel supply pipe 8 When the supplied fuel is ignited by a primary flame of a pilot burner (not shown), a high-temperature flame f is jetted into the ladle 2 from the burner nozzle 5a.

  Here, as shown in FIG. 2, assuming that one diameter direction with the pan lid 4 is B, the upper side is the upper side, and the lower side is the lower side, the regenerative burners 5 and 6 are on the diameter direction B. The right heat storage burner 5 is attached to the right side of the position equidistant from the center C1, and the left heat storage burner 6 is attached to the left side. The right heat storage burner 5 and the left heat storage burner 6 are provided such that their length directions are parallel to each other and substantially perpendicular to the diameter direction B of the pan lid 4.

  More specifically, the right-side heat storage burner 5 is set such that the position of the burner nozzle 5a is appropriately spaced from the center C1 on the diametrical direction B to the right, and the length direction is substantially perpendicular to the diametrical direction B. The heat accumulator 5c is disposed below the burner nozzle 5a. The left-side heat storage burner 6 is set such that the position of the burner nozzle 6a is set to the left of the center C1 on the diameter direction B and at the same interval as the right burner nozzle 5a. The heat accumulator 6c is disposed substantially at a right angle and above the burner nozzle 6a.

  In this embodiment, the heat storage burners 5 and 6 are arranged with respect to the pan lid 4 such that the length direction of the right heat storage burner 5 and the left heat storage burner 6 and the diameter direction B of the pan lid 4 are substantially perpendicular. Although it set, if the thermal storage type burners 5 and 6 are mutually arrange | positioned symmetrically regarding the center C1 of the pan lid 4, it will not restrict to this.

  In addition to this, the burner nozzles 5a, 6a are directed toward the axis X so that the flame f ejected from the burner nozzles 5a, 6a is ejected from the center C1 of the pan lid 4 toward the axis X lowered in the height direction. Is provided at an angle. In particular, the burner nozzles 5 a and 6 a are preferably installed at an angle such that the flame f is directed to the intermediate position C <b> 2 in the depth direction of the ladle 2.

  Next, the operation of the ladle preheating apparatus 1 according to the present embodiment will be described. In use, the pair of regenerative burners 5 and 6 attached to the ladle lid 4 of the empty ladle 2 are used in the ladle 2. The flame f is alternately ejected and burned toward the axis X. After preheating for a certain time, the pan lid 4 is hung with a crane or the like via the wire W to be opened, and the molten steel is received and transported for the next process.

  In the ladle preheating device 1 shown in the present embodiment, the burner nozzles 5a and 6a are arranged at an angle, and the flame f is directed in the direction of the axis X from the center C1 of the pan lid 4, thereby, Compared with the preheating operation by the ladle preheating device having a pair of alternating-type heat storage burners, the center axis of the ladle 2 is not ejected from the central axis X to the left region or the right region without the flame f being biased. The peripheral part on the axis line X is heated and the inside of the ladle 2 can be preheated uniformly.

  In addition, hot air flies in the ladle 2 as shown in FIG. 1 by ejecting a high-temperature flame f toward the periphery of the intermediate position C2 in the depth direction of the ladle 2. As a result, heat spreads to every corner of the ladle 2 and the internal atmosphere of the ladle 2 can be heated to a uniform temperature more efficiently.

  In the present embodiment, the heat storage burners 5 and 6 including the pair of heat storage bodies 5c and 6c, which are heavy objects, are provided by placing the heat storage burners 5 and 6 symmetrically with respect to the pot lid 4. 4 can be arranged in a well-balanced manner. As a result, there is no need to provide a large-scale device such as a heavy balance weight to balance the weight of the pan lid 4, and the pan lid 4 can be balanced with a simple method such as hanging several portions of the pan lid 4 with wires. Can be opened and closed. In addition, since the weight of the pan lid 4 is balanced, deformation of the pan lid 4 can be prevented without forming ribs or the like on the pan lid 4 for reinforcing deformation prevention, for example.

  In the present embodiment, a pair of regenerative burners 5 and 6 are used. For this reason, it is applicable also to a large-sized thing compared with the case where the one-type regenerative burner described in the background art is provided at the center of the pan lid. Specifically, in the single unit type, only a capacity of about 200,000 Kcal / hr can be secured at most, but the pair of regenerative burners 5 and 6 can secure a capacity of 500,000 Kcal / hr or more, and is small. The inside of the ladle 2 can be preheated evenly, from the ladle 2 to the large one.

  Next, the 1st modification of the ladle preheating apparatus 1 concerning this embodiment is demonstrated. In the first modification, the pair of regenerative burners 5 and 6 are arranged on the pan lid 4 so that the lengthwise sides thereof face each other.

  Describing in more detail with reference to FIG. 5, the right-side heat storage burner 5 has its burner nozzle 5a disposed at an appropriate interval in a certain diameter direction B from the center C1 of the pan lid 4 in the same manner as in FIG. . In particular, in the present modification, the right heat storage burner 5 is arranged in parallel with respect to another diameter direction D having a constant angle with respect to the diameter direction B. The left-side heat storage burner 6 has a burner nozzle 6a disposed on the diameter direction B from the center C1 of the pan lid 4 at the same interval as the right-side burner nozzle 5a, and its length direction is in the diameter direction D. It is arranged in parallel, that is, in parallel with the right heat storage burner 5.

  Thereby, the heat storage burners 5 and 6 can be stored on the pan lid 4 without protruding from the outer peripheral edge of the pan lid 4. Therefore, the ladle preheating apparatus 1 can be installed without providing an extra space. In particular, in the ladle preheating device 1 having a relatively small size, when the heat storage burners 5 and 6 are large with respect to the pan lid 4, the installation space of the ladle preheating device 1 is compact by arranging as described above. Can be. Moreover, since the regenerative burners 5 and 6 do not protrude from the pan lid 4, the attachment position of the wire hole 7 can be set freely.

  Next, the 2nd modification of the ladle preheating apparatus 1 concerning this embodiment is demonstrated. In the second modification, as shown in FIG. 6, a fuel supply pipe 8 'is provided between the right burner nozzle 5a and the left burner nozzle 6a. A spark plug 9 is provided in the immediate vicinity of the fuel supply pipe 8 '.

  High-temperature combustion air a is alternately ejected from the right combustion nozzle 5a and the left combustion nozzle 6a, and the combustion air a and the fuel in the fuel supply pipe 8 'are ignited by the spark plug 9, so that the ladle The flame f is produced | generated toward the axis line X which is 2 central axes.

  The peripheral part on the axis X which is the center axis of the ladle 2 is heated by the flame f, and the inside of the ladle 2 can be preheated uniformly. In addition, the hot air swirls in the ladle 2 by jetting a high-temperature flame f toward the periphery of the intermediate position C2 in the depth direction of the ladle 2. As a result, as in the above embodiment, heat spreads to every corner of the ladle 2, and the internal atmosphere of the ladle 2 can be heated to a uniform temperature more efficiently.

It is a sectional side view which shows suitable embodiment of the ladle preheating apparatus concerning this invention. It is a top view of the ladle preheating apparatus shown in FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. It is a side view which shows the state which suspended the pan lid of FIG. 2 with the crane. It is a top view which shows the 1st modification of the ladle preheating apparatus concerning this invention. It is a sectional side view which shows the 2nd modification of the ladle preheating apparatus concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ladle preheater 2 Ladle 3 Opening part 4 Pan lid 5 Right thermal storage burner 6 Left thermal storage burner 5a Burner nozzle 6a Burner nozzle f Flame X axis

Claims (3)

A ladle that closes its opening is provided in a ladle that receives and transports molten steel, and the ladle lid has a pair of heat storages that are alternately burned in order to preheat the internal atmosphere of the empty ladle. In the ladle preheating device in which a burner nozzle is provided, and a burner nozzle for ejecting flame into the ladle is attached to the regenerative burner.
The pair of burner nozzles are provided at equidistant positions in the diametrical direction from the center of the pan lid, and in order to uniformly preheat the inside of the ladle, on the axis line taken down in the height direction from the center of the pan lid A ladle preheating device characterized in that a flame is spouted out.   The ladle preheating device according to claim 1, wherein the pair of regenerative burners are arranged symmetrically with respect to the center of the pot lid.   The ladle preheating device according to claim 2, wherein the pair of heat storage burners are arranged so that the lengthwise sides thereof face each other.

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