JP2015152230A - Preheater used in melting furnace, melting system, and melting system construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a preheater capable of being additionally installed for an existing melting furnace and ensuring hermetic performance during operation.SOLUTION: A preheater 100 preheating a material supplied to a furnace body melting the material by heat generated in the furnace body, comprises: a preheating shaft 11 that includes a material feeding opening portion 18 formed to be fit to and opposed to a material loading opening portion formed in the furnace body and feeding the material to the furnace body, and that stores the material; a preheating chamber tilt mechanism 1, 2, 13 separate from a furnace body tilt mechanism tilting the furnace body; and a preheating-chamber tilt control unit 14 configured to tilt the preheating shaft 11 in response to tilting of the furnace body by the furnace body tilt mechanism while keeping a state in which the material loading opening portion of the furnace body is opposed to the material feeding opening portion 18 of the preheating chamber (preheating shaft) 11 at least at a time of tapping molten metal formed in the furnace body.

Description

  The present invention relates to a preheating device used in a melting furnace for melting raw materials such as iron scrap, a melting facility using the same, and a method for constructing a melting facility.

  A melting furnace such as an arc furnace is a facility that mainly charges a solid metal raw material into the furnace to melt the solid metal raw material. In the case of an arc furnace for steel making, which is a typical melting furnace, iron is used as the raw material. Scrap, reduced iron (DRI), hot briquette iron (HBI), cold iron (model iron), etc. made from briquetting it at high temperature are used, and these raw materials are inserted into the furnace and energized. Dissolve.

  In such a melting furnace, a large amount of electric power is consumed for melting raw materials. However, in the melting furnace, about 15 to 25% of the total heat input by the input power and oxygen blowing burner is discharged as sensible heat of the generated gas.

  Therefore, many methods have been proposed in which scrap is melted while preheating with gas generated from a furnace during melting, and the required power is reduced as much as possible.

  For example, Patent Document 1 discloses a supply device for supplying a raw material to a melting furnace while preheating a raw material such as iron scrap.

  Further, Patent Document 2 has a melting chamber for melting a cold iron source (raw material) such as scrap by an arc and a preheating shaft directly connected to the upper portion thereof, and the cold iron source is continuously connected to the melting chamber and the preheating shaft. There is disclosed a melting facility for melting a cold iron source in a melting chamber by an arc while continuously or intermittently supplying a cold iron source to a preheating shaft so as to keep the existing state.

Special table 2007-513310 gazette Japanese Patent Laid-Open No. 11-241889

  However, as described in Patent Document 1, if the preheating shaft (supplying device) and the melting furnace are formed separately, it is difficult to ensure sufficient airtightness between them. In particular, in the supply device of Patent Document 1, when the melting furnace is tilted at the time of discharge or steeling, the connection between the preheating shaft (supply device) and the melting furnace is canceled to tilt only the melting furnace. When the melting furnace is tilted, gas is released from the gap between them. Further, during this time, the state where the cold iron source is continuously present in the melting chamber and the preheating shaft (supply device) cannot be maintained, and it is necessary to empty the supply device once and the like, and it is difficult to improve the operation efficiency.

  On the other hand, the melting equipment disclosed in Patent Document 2 is excellent in terms of airtightness because the melting chamber and the preheating shaft are integrated, and further, the melting chamber and the preheating shaft are inclined when steel is output. Even in this case, it is possible to maintain a state in which the cold iron source is continuously present in the melting chamber and the preheating shaft (supply device). However, when the melting chamber and the preheating shaft are integrated in this way, when the equipment is renewed, both foundations must be newly constructed, which takes time for construction and increases the number of days of equipment stoppage. End up. Also, the equipment renewal cost is high.

  The present invention has been made in view of such circumstances, and includes a preheating device that can be additionally installed in an existing melting furnace and can ensure hermeticity during operation, and such a preheating device. It is an object to provide a melting facility and a method for constructing such a melting facility.

  In order to solve the above-mentioned problem, a first aspect of the present invention is a preheating device for preheating the raw material supplied to a furnace main body for melting the raw material by heat generated in the furnace main body, A preheating chamber for storing the raw material, having a raw material feeding opening for feeding the raw material to the furnace body, which is formed so as to be compatible with and opposed to the raw material charging opening formed in A preheating chamber tilting mechanism that is separate from the furnace body tilting mechanism for tilting the furnace body, and at least when the molten metal formed in the furnace body is discharged, the raw material charging opening of the furnace body and the An interlocking device configured to tilt the preheating chamber in accordance with the tilting of the furnace main body by the furnace main body tilting mechanism while maintaining a state in which the raw material feeding opening of the preheating chamber is opposed to each other. And

  In the preheating device of the first aspect, the center axis of the rolling motion associated with the tilting of the furnace body in the furnace body tilting mechanism is the center axis of the rolling motion associated with the tilting of the preheating chamber in the preheating chamber tilting mechanism. You may be comprised so that it may become coaxial with an axis | shaft.

  In the preheating device according to the first aspect, the interlock device may include a preheating chamber side connecting portion that is mechanically connected to the furnace body side. In this case, the preheating chamber tilting mechanism includes a preheating chamber base that supports the preheating chamber and is swingably provided, and a preheating chamber tilting cylinder that tilts the preheating chamber, and the preheating chamber side connecting portion. In the preheating chamber base, at least two locations spaced apart from each other in the horizontal direction may be provided. Furthermore, the preheating chamber base may include only one preheating chamber swinging member on the lower surface that swings the preheating chamber on the basic structure for the preheating device.

  In the preheating device according to the first aspect, the interlock device is configured to control the preheating chamber tilting mechanism so as to tilt the preheating chamber in synchronization with the tilting of the furnace main body by the furnace main body tilting mechanism. A preheating chamber tilt control unit may be provided.

  According to a second aspect of the present invention, the preheating device according to the first aspect of the present invention is additionally provided in a melting furnace including at least the furnace main body and the furnace main body tilting mechanism for tilting the furnace main body. Melting equipment.

  In the melting facility of the second aspect, the furnace body tilting mechanism includes a furnace body base that supports the furnace body and is swingable, and a furnace body tilting cylinder that tilts the furnace body. The furnace main body pedestal includes a furnace main body side connecting portion to which the preheating chamber side connecting portion is connected, and the furnace main body side connecting portion corresponds to the preheating chamber side connecting portion in the furnace main body base. The corresponding preheating chamber side connecting portion and the furnace main body side connecting portion are rotated in a direction perpendicular to the central axis of the rolling motion associated with the tilting of the preheating chamber and the furnace main body and extending in the horizontal direction. The structure connected so that rotation around a moving shaft is possible may be sufficient.

  The melting facility according to the second aspect may further include a ventilation suppression unit that suppresses the inflow and outflow of gas from the gap between the raw material feeding opening and the raw material charging opening. Good. The air flow suppression unit may have a labyrinth seal structure provided between the raw material feeding opening and the raw material charging opening, or the raw material feeding opening and the You may have a cylindrical body of the bellows structure provided between the opening parts for raw material charging.

  According to a third aspect of the present invention, there is provided a melting furnace including at least a furnace main body for melting a raw material and a furnace main body tilting mechanism for tilting the furnace main body, wherein the raw material is charged into the furnace main body. Forming an opening, and installing the preheating device according to the second aspect such that the raw material feeding opening is opposed to the raw material charging opening. This is a method for constructing a melting facility.

  In the melting facility construction method according to the third aspect, the melting furnace may be actually operated before the step of forming the raw material charging opening.

  Furthermore, the melting facility construction method according to the third aspect includes providing an airflow suppressing unit that suppresses the inflow and outflow of gas from the gap between the raw material feeding opening and the raw material charging opening. May further be included. The air flow suppression unit may have a labyrinth seal structure provided between the raw material feeding opening and the raw material charging opening, or the raw material feeding opening and the You may have a cylindrical body of the bellows structure provided between the opening parts for raw material charging.

  In addition, in each aspect of the present invention described above, that the raw material feeding opening is compatible with the raw material charging opening means that these openings are in contact or non-contact with each other. It means that it has the same or complementary shape to the extent that the effect of preventing air from passing through is obtained. In addition, the state in which the raw material feeding opening and the raw material charging opening are opposed to each other means that these openings are not immovably fixed to each other by welding or the like, It means a state where they are close and non-contacting each other.

  According to the present invention, it can be added to an existing melting furnace, and during operation, the raw material is always kept continuously between the furnace body and the preheating chamber, and the airtightness is also maintained, There is provided a preheating device capable of tilting a furnace main body for waste water or hot water. According to the present invention, there is provided a melting facility constructed by additionally installing the above preheating device, whereby even if the preheating device is additionally installed in an existing melting furnace, the airtightness during operation is maintained. A melting facility with high thermal efficiency is realized. Furthermore, according to the present invention, there is provided a method for constructing a melting facility capable of realizing a melting facility with high thermal efficiency in which a preheating device is additionally installed in an existing melting furnace and hermeticity during operation is maintained.

It is a perspective view which shows the preheating apparatus which concerns on 1st Embodiment of this invention. It is a top view which shows the melting equipment using the preheating apparatus of 1st Embodiment. It is sectional drawing which shows the melt | dissolution equipment using the preheating apparatus of 1st Embodiment. It is sectional drawing which shows the 1st modification of a ventilation | gas_flowing suppression part. It is sectional drawing which shows the 2nd modification of a ventilation | gas_flowing suppression part. It is a top view which shows the melting equipment using the preheating apparatus of 2nd Embodiment. It is sectional drawing which shows the melting equipment using the preheating apparatus of 2nd Embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a perspective view showing a preheating apparatus according to the first embodiment of the present invention. The preheating device 100 of the first embodiment is configured to be additionally installed in an existing melting furnace, and preheats raw materials such as iron scrap to be supplied to the furnace body of the melting furnace, which will be described later, by the heat of gas generated in the furnace body. Is for. As shown in FIGS. 2 and 3 to be described later, this preheating device 100 is adapted to the raw material charging opening 37 formed in the raw material charging opening 37 formed in the furnace main body 31 of the melting furnace. A preheating shaft (preheating chamber) 11 for storing raw materials and having a raw material feeding opening 18 for feeding to 31 and a preheating shaft base (preheating) for supporting the preheating shaft 11 on the foundation structure 20 for a preheating device in a tiltable manner. A preheating shaft tilting cylinder 13 for tilting the preheating shaft 11 on the preheating shaft base 1, and a preheating shaft tilting control unit 14 for controlling the preheating shaft tilting cylinder 13. The preheating shaft tilt control unit 14 is configured such that at least when the molten metal formed in the furnace body 31 is discharged, the raw material charging opening 37 of the furnace main body 31 and the raw material feeding opening 18 of the preheating shaft 11 are relative to each other. The preheating shaft tilting cylinder 13 is controlled to tilt the preheating shaft 11 in synchronization with the tilting of the furnace body 31 by the furnace body tilting mechanism while maintaining the state.

  The preheating shaft 11 has an iron outer shell. A raw material supply port 15 and an opening / closing lid 16 for opening and closing the raw material supply port 15 are provided at the upper portion of the preheating shaft 11. An exhaust port 17 is provided in the upper part of the preheating shaft 11, and a raw material feed opening 18 is provided in the lower part of the preheating shaft 11.

  A raw material such as iron scrap is charged into the preheating shaft 11 from a raw material supply port 15 by a bucket (not shown). At this time, in order to keep the sealed state as much as possible, the bucket with the upper lid closed is attached to the raw material supply port 15, and in this state, the open / close lid 16 is opened and the raw material is charged. Thereby, even when the raw material is charged into the preheating shaft 11, the upper portion of the preheating shaft 11 is covered with the bucket, so that the airtightness of the preheating shaft 11 is maintained. The opening / closing lid 16 is closed except when the raw material is charged into the preheating shaft 11.

  The exhaust port 17 is for exhausting the gas generated in the furnace body of the melting furnace, and is connected to the exhaust gas duct 57 as shown in FIG. The raw material in the preheating shaft 11 is preheated by the heat of the gas from the furnace body.

  The raw material feeding opening 18 is for feeding the raw material in the preheating shaft 11 to the furnace main body 31 of the melting furnace, and the raw material charging opening 37 formed in the furnace main body 31 (details will be described later). To be). The raw material feeding opening 18 and the raw material charging opening 37 are configured to be movable with respect to each other, and the preheating device and the furnace main body are caused by sinking of the preheating device basic structure 20 of the preheating device 100 additionally provided. Even if a deviation occurs in the relative position, the structure can absorb it.

  The preheating shaft base 1 has two preheating shaft swinging members 2 provided at the lower part of the preheating shaft 11, and the lower surface of the preheating shaft swinging member 2 has an arc shape. The preheating shaft base 1 is placed on a rail 21 laid on the foundation structure 20 for the preheating device, and swings on the rail 21 by advancing or retracting the piston of the preheating shaft tilting cylinder 13. Thus, the preheating shaft 11 can be tilted.

The melting furnace usually has a tilting mechanism in the furnace body for hot water discharge and drainage.
Because the preheating device 100 of the embodiment is additionally installed in an existing melting furnace, the preheating shaft 11 is tilted by a tilting mechanism that is separate from the tilting mechanism of the furnace body in the melting furnace. The preheating shaft 11 can be tilted by a preheating shaft tilting mechanism when the furnace main body is tilted at the time of draining or tapping. The preheating shaft tilting mechanism moves the preheating shaft 11 to the furnace main body 31 while maintaining the state in which the raw material charging opening 37 of the furnace main body and the raw material feeding opening 18 of the preheating shaft 11 face each other when the furnace main body is tilted. The preheating shaft 11 is tilted in accordance with the tilting. Thereby, the airtightness between the preheating shaft 11 and the furnace main body 31 can be ensured.

  In the first embodiment, the preheating shaft tilting cylinder 13 is configured as a ram cylinder. A counterweight 22 that can be tilted integrally with the preheating shaft 11 is provided on the preheating shaft tilt cylinder 13 side of the preheating shaft base 1. The overall gravity center position of the preheating shaft 11 and the counterweight 22 is lower than the gravity center position of the preheating chamber alone. Since the preheating shaft 11 itself has a high center of gravity, if it is tilted largely, the moment in the direction in which the preheating shaft 11 itself falls will increase. Therefore, by providing such a counterweight 22, it is possible to reduce the load applied to the preheating shaft tilting cylinder 13. Note that the center of gravity of the entire preheating shaft 11 and the counterweight 22 is always located on the side of the discharge port 44 with respect to the central axis of the rolling motion accompanying tilting. For this reason, when the hydraulic pressure is released, the preheating shaft 11 is tilted toward the exhaust port 44 with respect to the center axis of the rolling motion. In order to tilt the preheating shaft 11 toward the hot water outlet 43 with respect to the central axis of the rolling motion, it is necessary to supply the hydraulic pressure to the preheating shaft tilting cylinder 13 and push it out.

  The preheating shaft tilt control unit 14 controls the preheating shaft 11 to tilt in synchronization with the tilt of the furnace body 31 of the melting furnace.

  In the first embodiment, the raw material preheating device 100 further includes a pusher 19 that pushes the raw material in the preheating shaft 11 to the melting furnace through the raw material feed opening 18. The pusher 19 includes a cylinder 24 and a pressing member 25 provided at the tip of the piston of the cylinder 24, and the raw material in the preheating shaft 11 is moved into the melting furnace by the pressing member 25 by advancing the piston of the cylinder 24. Extrude.

  Next, melting equipment using the preheating device 100 as described above will be described. FIG. 2 is a plan view showing such a melting facility, and FIG. 3 is a side view thereof.

  The melting facility 300 is configured by additionally installing the above-described preheating device 100 in the existing melting furnace 200. The present invention is remarkable in that by adding a preheating device to a melting furnace that has been operating without a preheating device, it is possible to construct a melting facility with high thermal efficiency while effectively utilizing existing facilities. effective. That is, there is a remarkable effect when the melting furnace is actually operated before the step of forming the raw material charging opening of the present invention. However, the present invention can be applied to a case where a facility having a preheating device is required before the melting furnace is actually operated after the melting furnace has been installed without the preheating device. It is effective because a preheating device can be additionally installed.

  The melting furnace 200 includes a furnace body 31 for arc melting of raw materials such as iron scrap, a furnace body pedestal 3 that supports the furnace body 31 in a tiltable manner on the melting furnace basic structure 40, and a furnace body pedestal 3. A furnace body tilting cylinder 33 for tilting the furnace body and a furnace body tilting control unit 34 for controlling the tilting cylinder are provided. The furnace body pedestal 3 and the furnace body tilting cylinder 33 constitute a furnace body tilting mechanism.

  The furnace body 31 has an iron outer shell having a water cooling structure, and the molten metal storage portion at the bottom has a refractory lining 39. An openable / closable furnace lid 35 is attached to the upper opening of the furnace body 31, and three electrodes 36 are inserted vertically into the furnace body 31 from above through the furnace lid 35. An arc formed by applying an AC voltage to the electrode 36 from a power source (not shown) can melt the raw material supplied from the preheating shaft 11 and heat the molten metal produced by melting the raw material. It has become. Further, a slag for smelting is formed on the molten metal generated in the furnace body 31. In FIG. 3, 51 is a raw material such as iron scrap, 52 is a molten metal, and 53 is a slag. The tip of the electrode 36 is located in the slag 53 and an arc is formed in the slag 53.

  A raw material charging opening 37 for charging the raw material into the furnace main body 31 is provided on the side wall of the furnace main body 31, and the raw material charging opening 37 has a flange 38. The raw material feeding opening 18 of the preheating shaft 11 is formed so as to be compatible with and opposed to the raw material charging opening 37. At this time, as described above, the preheating shaft 11 is tilted by a tilting mechanism that is separate from the furnace main body 31 and can be moved relative to each other. Therefore, in order to ensure airtightness even if such a shift occurs, in the first embodiment, the raw material feeding opening 18 is provided with a flange 23, and the raw material charging opening 37 is provided with a flange 38. The flange 23 and the flange 38 are combined. In addition, by providing the flange 23 and the flange 38, even if a gap is generated between the raw material feeding opening 18 and the raw material charging opening 37, it is possible to prevent gas from flowing through the gap. Is born. Therefore, in the first embodiment, the flange 23 and the flange 38 are provided between the raw material feeding opening 18 and the raw material charging opening 37, and the gas flows in and out from the gap between them. It functions as a ventilation suppression unit that suppresses.

  The furnace body 31 is provided with a hot water outlet 43 and a waste outlet 44 at opposite positions. Further, the center of gravity of the furnace main body 31 is arranged so that the center of gravity of the preheating shaft 11 and the counterweight 22 is always located on the side of the discharge port 44 with respect to the center axis of the rolling motion accompanying tilting. Has been made. Therefore, by releasing the hydraulic pressure of the furnace body tilting cylinder 33 configured as a ram cylinder in the same manner as the preheating chamber side, the piston is retracted and the furnace body 31 is tilted to the exhaust port 44 side. Slag is discharged from On the other hand, in order to tilt the furnace body 31 toward the hot water outlet 43 side with respect to the central axis of the rolling motion, it is necessary to supply and push out the hydraulic pressure to the furnace body tilt cylinder 33. By supplying hydraulic pressure and advancing the piston of the furnace body tilting cylinder 33, the furnace body 31 is tilted toward the hot water outlet 43, and the molten metal is discharged from the hot water outlet 43.

  Like the preheating shaft base 1, the furnace body pedestal 3 has two furnace body oscillating members 4 provided below the furnace body 31, and the bottom surface of the furnace body oscillating member 4 has an arc shape. ing. The furnace body pedestal 3 is placed on a rail 41 laid on the melting furnace foundation structure 40, and swings on the rail 41 by driving the furnace body tilting cylinder 33, thereby causing the furnace body 31 to move. It is possible to tilt.

  The furnace body tilt control unit 34 includes a hydraulic control mechanism 45 that controls the hydraulic pressure of the furnace body tilt cylinder 33 and a control unit 46 that electrically controls the hydraulic control mechanism 45. The furnace body tilt control unit 34 controls the drive of the furnace body tilt cylinder 33 so as to tilt the furnace body 31 at the time of draining and tapping.

  As described above, the preheating shaft 11 of the preheating device 100 according to the first embodiment can be tilted when the furnace body 31 is tilted. At that time, the raw material feeding opening 18 of the preheating shaft 11 is provided in the furnace. While maintaining a state facing the raw material charging opening 37 provided in the main body 31, the main body 31 is tilted in synchronization with the tilt of the furnace main body 31. Thereby, even when the furnace body 31 is tilted, it is possible to maintain high airtightness between them. At this time, the central axis of the rolling motion accompanying the tilting of the preheating shaft 11 (the central axis of the rolling motion accompanying the swinging of the preheating shaft base 1) is the central axis of the rolling motion accompanying the tilting of the furnace body 31 (furnace It is preferable to be configured so as to be coaxial with the central axis of the rolling motion associated with the swing of the main body base 3. In general, when an object tilts, its motion includes a component of rolling motion and a component of translational motion at the center (axis) of the rolling motion. As in the first embodiment, when the preheating shaft pedestal 1 whose bottom surface has an arc shape on a linear rail extending in the horizontal direction tilts, the arc-shaped center (axis) of the pedestal serves as the central axis of the rolling motion component. The central axis moves horizontally in the tilt direction. In the present invention, including the case where the central axis of the rolling motion is moved as described above, the central axis of the rolling motion accompanying the tilting of the preheating shaft 11 is the central axis of the rolling motion accompanying the tilting of the furnace body 31. It is preferable that it is comprised so that it may become coaxial. More preferably, the lower surface of the preheating shaft pedestal 1 and the lower surface of the furnace body pedestal 3 have an arc shape, and their centers of curvature coincide with each other when viewed from the direction of the rolling axis of tilting. Thereby, it becomes possible to maintain the airtightness between the raw material feeding opening 18 and the raw material charging opening 37 higher.

  The preheating shaft tilt control unit 14 of the preheating device 100 described above includes a hydraulic control mechanism 55 that controls the hydraulic pressure of the preheating shaft tilt cylinder 13 and a control unit 56 that electrically controls the hydraulic control mechanism 55. As described above, the preheating shaft tilt control unit 14 controls the preheating shaft 11 to perform a tilting operation corresponding to the tilting operation of the furnace body 31 in synchronization with the tilting of the furnace body 31. At this time, the control unit 56 receives an operation signal necessary for tilting in synchronization with the tilt timing of the furnace body 31 from the control unit 46 of the melting furnace 200, and the control unit 56 receives the tilt operation signal. Based on the above, the preheating shaft tilting cylinder 13 is controlled to tilt the preheating shaft 11 in synchronization with the tilting of the furnace body 31.

  Next, the process at the time of constructing the melting equipment 300 by additionally installing the raw material preheating apparatus 100 in the existing melting furnace will be described.

  First, in a melting furnace having at least a furnace main body 31 for melting the raw material and a furnace main body tilting mechanism for tilting the furnace main body 31, a raw material charging opening 37 for charging the raw material is formed in the furnace main body 31. . Then, the foundation structure 20 of the preheating device 100 is formed adjacent to the foundation structure 40 of the melting furnace 200. Furthermore, it has a raw material feeding opening portion 18 that matches the raw material charging opening portion 37, and includes a preheating shaft 11 that stores the raw material therein, and a preheating shaft tilting mechanism that is separate from the furnace body tilting mechanism. The preheating device 100 that preheats the raw material by heat generated in the furnace body 31 is installed so that the raw material feeding opening portion faces the raw material charging opening portion. In addition, at least when the molten metal formed in the furnace main body 31 is discharged, the raw material charging opening 37 of the furnace main body 31 and the raw material feeding opening 18 of the preheating shaft 11 are kept facing each other. However, the preheating device 100 is provided with an interlocking device (preheating shaft tilt control unit 14) configured to tilt the preheating shaft 11 in accordance with the tilting of the furnace body 31 by the furnace body tilting mechanism. At this time, the central axis of the rolling motion accompanying the tilting of the preheating shaft 11 (the central axis of the rolling motion accompanying the swinging of the preheating shaft base 1) is coaxial with the central axis of the rolling motion accompanying the tilting of the furnace body. It is preferable to do so. More preferably, the center of curvature of the lower surface of the preheating shaft pedestal 1 coincides with the center of curvature of the lower surface of the furnace body pedestal 3 when viewed from the direction of the rolling axis of tilting.

  In this way, since the preheating device 100 can be additionally installed in the existing melting furnace, a new foundation may be the portion of the preheating device 100, and the construction is more than the melting equipment in which the melting chamber and the preheating shaft are integrated. The number of days can be reduced, and the equipment renewal cost can be reduced.

Next, the processing operation by the melting equipment 300 configured as described above will be described.
First, a raw material 51 such as iron scrap is charged into the preheating shaft 11 from the raw material supply port 15 of the preheating shaft 11, and the raw material 51 is passed through the raw material feeding opening 18 and the raw material charging opening 37. 31. The raw material 51 is continuously present in the preheating shaft 11 and the furnace body 31.

  In this state, an electric current is applied between the electrode 36 and the raw material 51 in the furnace body 31 to form an arc, and the raw material 51 is melted. When melting of the raw material 51 in the furnace body 31 proceeds and a certain amount of molten metal 52 is formed in the furnace body 31, a slag 53 is formed on the surface of the molten metal, and from the lance (not shown) in the slag 53. Coke as an auxiliary heat source is injected into the slag to shift to a slag forming operation, and the tip of the electrode 36 is buried in the slag 53 so that an arc is formed in the slag 53.

  The gas generated in the furnace body 31 is discharged from the furnace body 31 through the preheating shaft 11 and the exhaust port 17 via the duct 57, and the raw material 51 in the preheating shaft 11 is preheated by the heat of the gas. When the raw material 51 is melted in the furnace body 31, the raw material 51 in the preheating shaft 11 is supplied to the furnace body 31, and the raw material 51 can be continuously melted in the furnace body 31. At this time, in order to promote the supply of the raw material 51 to the furnace main body 31, the raw material 51 in the preheating shaft 11 is pushed out into the furnace main body 31 by the pusher 19.

  When the raw material 51 in the preheating shaft 11 is supplied to the furnace body 31, the upper end position of the raw material 51 in the preheating shaft 11 is lowered, so that the raw material 51 exists continuously on the preheating shaft 11 and the furnace body 31. In order to keep the state, the raw material 51 is supplied from the raw material supply port 15 into the preheating shaft 11 in a timely manner.

  In these series of operations, except when the raw material 51 is supplied to the preheating shaft 11, the raw material supply port 15 is closed by the opening / closing lid 16, and the raw material feeding opening 18 of the preheating shaft 11 is formed in the furnace body 31. The preheating efficiency is high because the airtightness is maintained by being arranged so as to be compatible with and opposed to the raw material charging opening 37.

  In this way, when the raw material 51 is continuously melted and a predetermined amount (for example, one charge) of molten steel is accumulated in the furnace body 31, the raw material 51 is continuously provided between the preheating shaft 11 and the furnace body 31. Then, while maintaining the existing state, the furnace body 31 is tilted toward the discharge port 44 to discharge slag from the discharge port 44, and then the furnace body 31 is tilted toward the side of the hot water outlet 43 on the opposite side. The molten metal is taken out from the hot water outlet 43 to a hot pot or the like.

  When the furnace main body 31 is tilted at the time of discharge or hot water discharge, if the preheating shaft 11 is left as it is, the positions of the raw material feeding opening 18 and the raw material charging opening 37 are shifted, and airtightness is maintained. However, in the first embodiment, the preheating shaft 11 is configured to be tiltable by the preheating shaft tilting mechanism when the furnace body is tilted at the time of draining or hot water, etc. The raw material feeding opening 18 of the preheating shaft 11 is made to be relative to the raw material charging opening 37 provided in the furnace main body 31 so that the tilting operation at that time is a tilting operation synchronized with the tilting operation of the furnace main body 31. Try to keep the state to do. Thereby, even when the furnace main body 31 tilts, it becomes possible to maintain high airtightness between the raw material feeding opening 18 and the raw material charging opening 37, and preheating when the furnace main body 31 is tilted. It is possible to suppress a decrease in efficiency. In addition, since the furnace body 31 can be tilted for draining or hot water while the raw material is continuously present between the furnace body 31 and the preheating shaft 11, the operation is easy and the heat efficiency is high. Can also be maintained. At this time, the central axis of the rolling motion accompanying the tilting of the preheating shaft 11 (the central axis of the rolling motion accompanying the swing of the preheating shaft base 1) is used as the central axis of the rolling motion accompanying the tilting of the furnace body 31 (furnace The center axis of the rolling motion accompanying the swing of the main body base 3 is preferably coaxial. More preferably, the center of curvature of the lower surface of the preheating shaft pedestal 1 coincides with the center of curvature of the lower surface of the furnace body pedestal 3 when viewed from the direction of the rolling axis of tilting. Thereby, the tilting position of the preheating shaft 11 can be matched with the tilting position of the furnace body 31 with high accuracy, and the above effects can be further enhanced.

Next, a modified example of the present invention will be described.
In the said 1st Embodiment, the flange 23 and the flange 38 are provided in the joint part of the opening part 18 for raw material supply and the opening part 37 for raw material charging, and these function as a ventilation suppression part.

  FIG. 4 shows a first modification. In the first modification, a labyrinth seal structure 61 is provided as an airflow suppressing portion between the raw material feeding opening 18 and the raw material charging opening 37. Since the labyrinth seal structure 61 has a bent gas passage, it can more effectively suppress the ventilation and increase the airtightness.

  FIG. 5 shows a second modification. In the second modification, a bellows-structured cylindrical body 62 is provided as an airflow suppressing portion between the raw material feeding opening 18 and the raw material charging opening 37. Since the cylindrical body 62 having the bellows structure can substantially completely seal between the raw material feeding opening 18 and the raw material charging opening 37 and can follow the separation and deviation therebetween, The airtightness between the feeding opening 18 and the raw material charging opening 37 can be almost completely ensured.

  Next, a second embodiment will be described. FIG. 6 is a plan view showing a melting facility 600 using the preheating device 400 of the second embodiment, and FIG. 7 is a sectional view thereof. In the following description, main differences between the second embodiment and the first embodiment will be described, and overlapping descriptions will be omitted.

  In the first embodiment, a preheating shaft tilt control unit (preheating chamber tilt control unit) 14 that controls the preheating chamber tilting mechanism to tilt the preheating chamber in synchronization with the tilting of the furnace main body by the furnace main body tilting mechanism as the interlocking device is provided. The configuration was shown. In addition to this, the interlocking device provided in the preheating device 400 of the second embodiment includes a preheating shaft side connecting portion (preheating chamber side connecting portion) 5 that is mechanically connected to the furnace body side. The furnace body tilting mechanism includes a furnace body base 3 that supports the furnace body 31 and is swingable, and a furnace body tilting cylinder 33 that tilts the furnace body 31. The preheating chamber tilting mechanism includes a preheating shaft base 1 that supports the preheating shaft 11 and is swingable, and a preheating shaft tilting cylinder 13 that tilts the preheating shaft 11, and the preheating shaft side connecting portion 5 is preheated. It is provided on the shaft base 1. The furnace body pedestal 3 includes a furnace body side coupling part 6 to which the preheating shaft side coupling part 5 is coupled, and the preheating shaft side coupling part 5 and the furnace body side coupling part 6 are mechanically coupled by a coupling shaft 7. Has been.

  In 2nd Embodiment, in addition to the preheating shaft tilt control part 14 demonstrated in detail in 1st Embodiment, the preheating shaft side connection part 5, the furnace main body side connection part 6, and the connection shaft 7 are provided as an interlocking device. Yes.

  By adopting a configuration in which the preheating device and the melting furnace are mechanically connected in this way, the furnace body tilting mechanism is maintained while maintaining the state in which the raw material charging opening and the raw material feeding opening face each other more reliably. It is possible to tilt the preheating chamber in accordance with the tilting of the furnace main body due to. In particular, by providing such a mechanical connection part in addition to the preheating chamber tilt control part, the mechanical load applied to the connection part is reduced compared to the structure of only the connection part, and in the unlikely event that it is synchronized by some disturbance or the like. Even when a situation where the synchronization cannot be achieved by the control occurs, it is possible to reliably keep the raw material charging opening and the raw material feeding opening facing each other. However, in the present invention, a configuration having only a mechanical connecting portion is also possible.

  Moreover, in 2nd Embodiment, the preheating shaft side connection part 5 is provided in at least two places mutually spaced apart in the horizontal direction in the preheating shaft base 1, and the furnace main body side connection part 6 is the furnace main body base 3. The preheating shaft side connecting portion 5 is provided at a position corresponding to the preheating shaft side connecting portion 5, and the corresponding preheating shaft side connecting portion 5 and the furnace body side connecting portion 6 are connected by the connecting shaft 7 to the preheating shaft 11 and the furnace main body 31. It is connected so as to be rotatable around a rotation axis that is orthogonal to the central axis of the rolling motion accompanying tilting and extends in the horizontal direction. And the preheating shaft base 1 is provided with only one preheating shaft rocking member 2 for rocking the preheating shaft 11 on the foundation structure 20 for the preheating device.

  In the first embodiment, the two preheating shaft oscillating members 2 are provided. However, as in the second embodiment, only one preheating shaft oscillating member 2 is provided, and the preheating shaft 11 has a one-legged structure. By enabling the rotation around the rotation axis as described above, the degree of freedom of movement on the preheating chamber side is increased, and there is a difference in the sedimentation state between the preheating device foundation structure 20 and the melting furnace foundation structure 40. When it occurs, it becomes possible to adapt more flexibly.

  The present invention is not limited to the above embodiment, and various other modifications are possible. For example, in the above-described embodiment, an example in which a ram cylinder is used as the tilting cylinder is shown, but a double-acting cylinder may be used. When a double-acting cylinder is used, a counterweight is not required, but the load on the cylinder can be reduced by providing a counterweight.

  In the above embodiment, the rocking pedestal is used as a mechanism for tilting the preheating shaft. However, the present invention is not limited to this. It is good also as a structure which provides the roller group made and supports a base with these roller groups. However, in this case, in order to tilt the preheating shaft in synchronization with the tilting of the furnace main body by the furnace main body tilting mechanism while keeping the raw material charging opening and the raw material feeding opening facing each other. The furnace body tilting mechanism needs to have the same configuration. In the case of the swing base as in the above embodiment, the central axis of the rolling motion accompanying the swing (tilting) moves in the horizontal direction, whereas the roller group arranged along the arc shape is used. When used, since the central axis of the rolling motion accompanying tilting is immobile, if they are mixed in the tilting configuration of the preliminary chamber and the furnace body, the material charging opening and the feed This is because the state in which the supply opening is opposed can not be maintained.

  Furthermore, it is needless to say that the melting furnace to which the preheating shaft is applied in the above embodiment is merely an example, and can be applied to other various types of melting furnaces. For example, although an AC type arc furnace is used as a melting furnace, a DC type arc furnace may be used.

  Furthermore, in the said embodiment, although iron scrap was illustrated as a raw material, it is not restricted to this, You may melt | dissolve another metal.

1: Preheating shaft base (preheating chamber base)
2; Preheating shaft swing member (preheating chamber swing member)
3; Furnace body pedestal 4; Furnace body swinging member 5; Preheating shaft side connecting part (interlocking device)
6; Furnace side connection (interlocking device)
7; Connecting shaft (interlocking device)
11: Preheating shaft (preheating chamber)
13; Preheating shaft tilt cylinder 14; Preheating shaft tilt control unit (interlocking device)
15; Raw material supply port 16; Open / close lid 17; Exhaust port 18; Raw material feeding opening 19; Pusher 20; Preheating device basic structure 22; Counterweight 23;
31; Furnace body 33; Furnace body tilting cylinder 34; Furnace body tilting control unit 35; Furnace lid 36; Electrode 37; Raw material charging opening 38; Flange 39; Lining 40; Melting furnace base structure 43; ; Exhaust port 61; Labyrinth seal structure (venting control part)
62; cylindrical body of bellows structure (ventilation suppressing part)
100,400; Preheating device 200,500; Melting furnace 300,600; Melting equipment

Claims (12)

A preheating device for preheating the raw material supplied to the furnace body for melting the raw material by heat generated in the furnace body,
The raw material is stored, having a raw material feeding opening for feeding the raw material to the furnace main body, which is formed so as to be compatible with and opposed to the raw material charging opening formed in the furnace main body. A preheating chamber,
A preheating chamber tilting mechanism separate from the furnace body tilting mechanism for tilting the furnace body;
At least when the molten metal formed in the furnace body is discharged, the raw material charging opening of the furnace main body and the raw material feeding opening of the preheating chamber are kept facing each other. A preheating device comprising an interlocking device configured to tilt the preheating chamber in accordance with tilting of the furnace main body by a main body tilting mechanism.   The center axis of the rolling motion associated with the tilting of the preheating chamber in the preheating chamber tilting mechanism is configured to be coaxial with the center axis of the rolling motion associated with the tilting of the furnace body in the furnace body tilting mechanism. The preheating device according to claim 1.   The preheating device according to claim 1 or 2, wherein the interlocking device includes a preheating chamber side connecting portion mechanically connected to the furnace body side. The preheating chamber tilting mechanism includes a preheating chamber base that supports the preheating chamber and is swingable, and a preheating chamber tilting cylinder that tilts the preheating chamber,
4. The preheating device according to claim 3, wherein the preheating chamber side connecting portion is provided at least at two positions spaced apart from each other in the horizontal direction in the preheating chamber base.   5. The preheating device according to claim 4, wherein the preheating chamber pedestal includes only one preheating chamber swinging member on the lower surface for swinging the preheating chamber on the basic structure for the preheating device.   The interlock device includes a preheating chamber tilt control unit configured to control the preheating chamber tilting mechanism to tilt the preheating chamber in synchronization with the tilting of the furnace body by the furnace body tilting mechanism. The preheating device according to any one of claims 1 to 5.   The melting equipment constructed by additionally installing the preheating device according to any one of claims 1 to 6, in a melting furnace including at least the furnace body and the furnace body tilting mechanism for tilting the furnace body. . The preheating device is according to claim 6,
The furnace body tilting mechanism has a furnace body pedestal that supports the furnace body and is swingable, and a furnace body tilting cylinder that tilts the furnace body,
The furnace body pedestal includes a furnace body side connection part to which the preheating chamber side connection part is connected,
The furnace body side connecting portion is provided at a position corresponding to the preheating chamber side connecting portion in the furnace body base.
The corresponding preheating chamber side connecting portion and the furnace body side connecting portion rotate around a rotation axis that is orthogonal to the central axis of the rolling motion accompanying the tilting of the preheating chamber and the furnace body and extends in the horizontal direction. The melting equipment according to claim 7, wherein the melting equipment is movably connected.   9. The air flow suppressing unit according to claim 7, further comprising an air flow suppressing unit that suppresses the inflow and outflow of gas from the gap between the raw material feeding opening and the raw material charging opening. Melting equipment. In a melting furnace having at least a furnace body for melting the raw material and a furnace body tilting mechanism for tilting the furnace body, forming a raw material charging opening for charging the raw material in the furnace body;
Installing the preheating device according to any one of claims 1 to 6 so that the raw material feeding opening is opposed to the raw material charging opening. To build a melting facility.   The melting furnace construction method according to claim 10, wherein the melting furnace is actually operated before the step of forming the raw material charging opening.   12. The method according to claim 10, further comprising providing an airflow suppressing unit that suppresses the inflow and outflow of gas from the gap between the raw material feeding opening and the raw material charging opening. The construction method of the melt | dissolution facility as described in 4.

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