JP5642864B1 - Molten metal container heating device - Google Patents

Abstract

An object of the present invention is to suppress an increase in the weight of a lid that is tilted by a predetermined angle around a rotation axis to open and seal an upper opening of a molten metal container, and a spillage of a heat storage member that occurs during opening and closing of the lid, and a gas fluid that passes through a heat storage chamber And a molten metal container heating device capable of sufficiently absorbing the displacement associated with the opening / closing operation of the lid due to tilting. A heat storage burner device having a pair of air supply and exhaust nozzles is provided on the lid. A pair of ducts are connected to the pair of air supply / exhaust nozzles. The duct includes a first duct disposed on the lid and a second duct having a heat storage chamber. The first duct has a first end connected to the supply / exhaust nozzle, a second end provided coaxially with the rotation axis, and the second duct has a first end coaxial with the second end of the first duct. Oppositely, the second end is connected to the heat storage chamber. A seal portion is interposed between opposing portions of the second end of the first duct and the first end of the second duct. The heat storage chamber is placed at a position unrelated to the opening and closing of the lid. [Selection] Figure 3

Description

  The present invention relates to a heating device for a molten metal container that heats the internal atmosphere of the molten metal container such as a ladle or a tundish.

  As an example of a heating device for a molten metal container, Patent Document 1 provides a lid for closing the upper opening of the molten iron pan at the tip of a tilting arm whose tip is tilted by a predetermined angle around the support shaft of the frame base. An apparatus for heating a molten iron pan provided with a heat storage burner is disclosed. The heat storage burner of Patent Document 1 incorporates a metal heat storage body in the burner body so that the heat storage body is not damaged by an impact generated when the lid is opened and closed.

  According to Patent Document 2, even when the tundish is tilted at the time of drainage, the spherical heat storage member that has been rolled by its own weight is stabilized at a predetermined angle of repose to prevent the spherical heat storage member from spilling out of the heat storage chamber. A tundish preheating device is disclosed.

  In Patent Document 3, a bent pipe that can be expanded and contracted is connected to a fixed pipe for vacuum piping, and a plurality of rotary joints having parallel rotation axes are connected, and a tip of the bent pipe is provided on the upper surface of the ladle. A molten metal degassing piping device connected to a vacuum lid is disclosed. By bending and expanding / contracting the bent pipe to which the rotary joint is connected in a predetermined direction, the pipe device is configured to cope with the movement of the ladle in the front-rear direction and the up-down direction.

JP 2000-102857 A Japanese Patent Laid-Open No. 10-047491 Japanese Utility Model Publication No. 62-023850

  In Patent Document 1, a heat storage burner, a heat storage body, and a duct through which combustion air and combustion exhaust gas switch in a flow direction are arranged in a lid. However, since these are heavy objects, the weight of the entire lid increases, and as a result, an opening / closing mechanism with high power is required. In addition, it is necessary to reinforce the lid with ribs for preventing deformation, or to provide a heavy weight balance weight for ensuring the weight balance of the lid, and there is a problem that the entire equipment becomes large.

  In patent document 1, when a heat storage body is comprised with many spherical heat storage members, there exists a concern that a heat storage member may spill out from a heat storage chamber at the time of the opening / closing operation | movement of a lid | cover. This problem can be prevented by applying the technique of Patent Document 2. However, when the lid returns from the open state to the closed state, the upper surface of the heat storage body in the heat storage chamber is not necessarily flat, and a new problem that the flow of combustion air or combustion exhaust gas passing through the heat storage chamber is biased Occurs.

  On the other hand, Patent Document 3 is provided with rotary joints at a plurality of locations of a fixed pipe to absorb displacement due to the opening and closing operation of the lid. Usually, the duct of a heat storage burner has an outer peripheral surface or an inner peripheral surface having a refractory heat insulating structure. Therefore, even if rotary joints are provided at a plurality of locations in the duct, it is not easy to absorb the displacement accompanying the opening / closing operation of the lid due to tilting.

  Therefore, the present invention suppresses an increase in the weight of the lid that is tilted by a predetermined angle around the rotation axis to open and close the upper opening of the molten metal container, and spills out of the heat storage member that occurs when the lid is opened and closed, or passes through the heat storage chamber. An object of the present invention is to provide a heating device for a molten metal container that can suppress the drift of the gas fluid that occurs and can sufficiently absorb the displacement accompanying the opening and closing operation of the lid due to tilting.

  The apparatus for heating a molten metal container according to the present invention includes a molten metal container having an upper opening and an opening / closing mechanism, and opens the upper opening by tilting a predetermined angle around a rotating shaft that is rotatably supported via a bearing. The lid to be sealed and the lid each have an opening in which one end is opened in the molten metal container and the other end is opened outside the molten metal container, and supply of combustion air and exhaust of combustion exhaust gas are alternately performed via a heat storage body. A pair of supply / exhaust nozzles and a fuel injection nozzle for injecting fuel into the molten metal container, and the pair of supply / exhaust nozzles include a pair of ducts having a heat storage chamber for storing the heat storage body. The site | part in which the said thermal storage chamber in the said one pair of duct is formed is arrange | positioned in the predetermined position different from the said lid | cover.

  According to this structure, since the heavy weight part in which the heat storage chamber is formed in the duct is arranged at a predetermined position different from the lid (a position irrelevant to opening and closing of the lid), the weight of the lid is increased. It can be suppressed. As a result, an opening / closing mechanism with high power is not required, and the overall size of the facility can be suppressed. In addition, the problem is that the heat storage member spills from the heat storage chamber during the opening operation of the lid by tilting, and the combustion air that passes through the heat storage chamber does not become flat when the lid returns from the open state to the closed state, Or the problem that combustion exhaust gas drifts can be prevented.

  Each of the pair of ducts includes a first duct disposed on the lid and a second duct having the heat storage chamber, and the first end of the first duct has the supply / exhaust at the first end. Connected to the nozzle, the second end is provided coaxially with the rotating shaft, the second duct has a first end coaxially opposed to the second end of the first duct, and a second end is the heat storage It is preferable that a seal portion is interposed between the second end of the first duct and the first end of the second duct connected to the chamber.

  According to this configuration, even with a duct having a heat insulating material applied to the outer peripheral surface or the inner peripheral surface, the displacement associated with the opening and closing operation of the lid can be sufficiently absorbed with a simple configuration, so that damage to the duct can be prevented. . Further, since the seal portion is interposed between the second end of the first duct and the first end of the second duct, it is possible to prevent the gas flowing through the first duct and the second duct from leaking outside.

  It is preferable that the second duct is configured to be close to and away from the first duct in the axial direction. Further, the facing portion is constituted by a pair of flanges provided at outer peripheral edge portions of the first duct and the second duct, and the seal portion is provided on at least one flange surface of the pair of flanges. It is preferable that

  According to these configurations, when operating the ladle preheating device, by moving the second duct to the first duct side, approaching the pair of flanges and pressing the seal portion interposed in the facing portion, The gas flowing through the first and second ducts can be prevented from leaking outside. On the other hand, when the lid is opened and closed, the second duct is moved away from the first duct and the pressing of the seal portion interposed in the facing portion is released, so that the seal portion and the opposite face are opened when the lid is opened and closed. It is possible to prevent the end surfaces of the first and second ducts from being damaged.

  The seal portion includes an annular inner gasket and an outer gasket made of an elastic material, and supplies gas to an annular space formed by one end face of the inner gasket and the outer gasket and the other flange face. When the pressure of the gas supplied from the air supply means is P1, and the internal pressure of the duct when the combustion air flows through the duct is P2, the relationship between the two is P1> P2 is preferable.

  According to this configuration, even if the axial center of the first duct and the axial center of the second duct are displaced and a gap is temporarily generated between the pair of flanges, the heat storage body is formed in the first and second ducts. When the combustion air preheated by heat exchange with the refrigerant flows, the pressure of the gas supplied from the air supply means to the annular space is set higher than the pressure in the first and second ducts, It is possible to prevent the combustion air from leaking outside through the gap. On the other hand, when the high-temperature combustion exhaust gas in the ladle is sucked and exhausted through the first and second ducts, the first and second ducts have negative pressure, and thus are supplied from the air feeding means to the annular space. Since the purge air is sucked into the first and second ducts, similarly, high-temperature combustion exhaust gas can be prevented from leaking outside through the gap.

  According to the present invention, an increase in the weight of the lid that tilts a predetermined angle around the rotation axis to open and close the upper opening of the molten metal container is suppressed, and the spillage of the heat storage member that occurs during the opening and closing operation of the lid and the heat storage chamber are passed. In addition, it is possible to provide a heating device for a molten metal container that can suppress the drift of the gas fluid that occurs and can sufficiently absorb the displacement associated with the opening / closing operation of the lid due to tilting.

It is a side view of the heating apparatus of the molten metal container which concerns on embodiment of this invention. It is a top view of the heating apparatus of the molten metal container which concerns on embodiment of this invention. It is the rear side view (partial cross section) of the heating apparatus of the molten metal container seen from the BB direction in FIG. It is side surface sectional drawing of the thermal storage type burner apparatus seen from CC direction in FIG. The case where the ladle preheating device is operated is shown, the second duct is moved to the first duct side, the first flange and the second flange are brought close to each other, and the seal portion interposed in the facing portion is pressed. FIG. It is the figure which showed the case where a lid | cover is opened and closed, and moved the 2nd duct in the direction away from a 1st duct, and showed the state which cancelled | released pressing of the seal part interposed in the opposing part.

  Hereinafter, a heating device for a molten metal container according to an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, terms and directions (for example, “one end” and “the other end”) are used for the sake of convenience, but these are for the purpose of facilitating the understanding of the invention, and depending on the meaning of these terms. The technical scope of the present invention is not limited. Further, the following description is merely an example of one embodiment of the present invention, and is not intended to limit the present invention, its application, or its use.

  In the present embodiment, a ladle preheating device which is an example of a heating device for a molten metal container will be described as an example. Generally, a ladle that receives molten steel from a converter and transports it to the continuous casting area is preheated by a heating means such as a burner before receiving the steel in order to compensate for the temperature drop of the molten steel after drying or receiving steel. It has become so.

  As shown in FIGS. 1 and 2, the ladle preheating device 1 includes a metal ladle 12 having an opening 10 serving as a pouring spout for molten metal and an opening 10 above the main body of the ladle 12. It has a lid 14 for closing and sealing, and a regenerative burner device 16 provided on the upper surface of the lid 14 for drying and preheating the ladle 12.

  The ladle 12 is configured, for example, by lining an alumina or charcoal siliceous refractory heat insulating material inside the iron skin.

  The lid 14 has a structure in which a refractory is lined on the lower side of the iron skin serving as a base material. A pair of tilting arms 20 a and 20 b extending from the lid 14 main body is provided on the upper surface of the lid 14. As shown in FIGS. 1 and 2, the tilting arms 20 a and 20 b are supported so that the tip end portion thereof can tilt about a predetermined angle (for example, 0 ° to 90 °) about the rotation shaft 22. As shown in the drawing, both end portions of the rotary shaft 22 are supported by a pair of bearings 24 a and 24 b on a gantry 202 disposed on the floor 200.

  On the other hand, driving mechanisms such as an electric cylinder and a hydraulic cylinder (not shown) are connected to the end sides of the tilting arms 20a and 20b. Thereby, the lid | cover 14 inclines within the range of the predetermined angle (within the range of the arrow direction), and the opening part 10 of the ladle 12 is comprised so that opening and sealing are possible.

  A heat storage burner device 16 is provided at the center of the lid 14. As shown in FIG. 4, the regenerative burner device 16 includes a burner body 160 made of a well-known refractory, an opening 162 a, 162 b, one end inside the ladle 12 and the other outside the ladle 12. 163a, 163b, formed between a pair of supply / exhaust nozzles 164a, 164b and supply / exhaust nozzles 164a, 164b which alternately supply combustion air and exhaust exhaust gas via a heat storage body, 12 has a fuel injection nozzle 166 for injecting fuel toward the inside. A pair of ducts 30a and 30b are connected to the other end side of the supply / exhaust nozzles 164a and 164b, and a fuel supply pipe 31 is connected to the other end side of the fuel injection nozzle 166.

  As shown in FIGS. 1 and 2, a pair of heat storage chambers 32a and 32b communicating with the ducts 30a and 30b are connected to the ducts 30a and 30b. A large number of spherical heat storage members constituting a heat storage body are accommodated in the heat storage chambers 32a and 32b. The heat storage chambers 32 a and 32 b are arranged on the floor 200. This will be described in detail later.

  Returning to FIG. 1, the ducts 30 a and 30 b are formed in a reverse U-shaped side surface. In addition, a refractory material is applied to the inside of the ducts 30a and 30b, and has a two-layer structure of a heat insulation layer 300 of a heat insulation board and a fireproof layer 302 of a castable (FIGS. 3, 5, and 6). reference).

  As shown in FIGS. 1 to 3, the ducts 30 a and 30 b include first ducts 34 a and 34 b disposed on the lid 14 and second ducts 35 a and 35 b having heat storage chambers 32 a and 32 b. ing.

  The first ducts 34a and 34b have first bent portions 340a and 340b in which the heat storage chambers 32a and 32b are bent in a substantially L shape. As shown in the drawing, opposing side surfaces near the corners of the first bent portions 340 a and 340 b are connected to both end surfaces of the rotating shaft 22.

  The first bent portions 340 a and 340 b are provided with first openings 342 a and 342 b (second ends) that are coaxial with the rotation shaft 22. In addition, first flanges 344a and 344b are attached to the outer peripheral edges of the first openings 342a and 342b. As a result, the first ducts 34 a and 34 b are tilted within a predetermined angle range together with the lid 14 in conjunction with the rotation of the rotary shaft 22.

  The second ducts 35a and 35b have second openings 352a and 352b (first ends) that are coaxial with the rotary shaft 22 and are opposed to the first openings 342a and 342b, and are substantially L-shaped therefrom. It has 2nd bending part 353a, 353b bent and connected with thermal storage chamber 32a, 32b. Second flanges 354a and 354b having outer diameters substantially equal to the first flanges 344a and 344b are attached to the outer peripheral edge portions of the second openings 352a and 352b.

  Seal portions 40a and 40b are interposed between opposing portions 38a and 38b of the first flanges 344a and 344b and the second flanges 354a and 354b. The detailed configuration of the seal portions 40a and 40b will be described in detail later.

  As shown in FIG. 3, in the ladle preheating device 1 of the present embodiment, the heat storage chambers 32 a and 32 b that are heavy objects are placed at predetermined positions different from the lid 14. More specifically, the heat storage chambers 32a and 32b are mounted on carts 50a and 50b that can reciprocate on a pair of rails 204a and 204b laid on the floor 200 with a certain gap with respect to the axis of the rotary shaft 22. Is placed.

  The carriages 50a and 50b have two pairs of freely rotatable wheels 52a and 52b. The carriages 50a and 50b are connected to an electric cylinder 66 including, for example, a screw shaft 60, a nut 62, and a motor 64 with a brake provided on the pedestal 202, and the motor 64 is rotated forward or backward by an operation switch (not shown). By rotating, the carriages 50a and 50b can be reciprocated on the rails 204a and 204b, and the carriages 50a and 50b can be positioned at desired positions.

  Specifically, when operating the ladle preheating device 1, as shown in FIG. 5, the electric cylinder 66 is driven to move the carriages 50a, 50b to the first duct 34b (34a) side, and the first The flange 344b (344a) and the second flange 354b (354a) are brought close to each other and the seal portion 40b (40a) interposed in the facing portion 38b (38a) is pressed to burn the regenerative burner device 16.

  The combustion of the regenerative burner device 16 is performed as follows. Combustion air supplied from a combustion air supply source (not shown) is, for example, preheated by heat exchange with the heat storage body of the heat storage chamber 32a after being supplied to the heat storage chamber 32a that has been stored in the previous process. It is introduced into the supply / exhaust nozzle 164a through the duct 30a.

  Then, the fuel supplied from the fuel supply source (not shown) to the fuel injection nozzle 166 through the fuel supply pipe 31 and the preheated high-temperature combustion air are mixed in the vicinity of the burner body 160 in the ladle 12. It is ignited by an ignition source such as a pilot burner (not shown), and a high-temperature combustion flame is formed toward the ladle 12.

  Further, the high-temperature combustion exhaust gas in the ladle 12 is sucked into the duct 30b through the supply / exhaust nozzle 164b by driving an exhaust gas suction fan (not shown), and the stored heat is lowered by heat exchange with the combustion air in the previous step. After passing through the chamber 32b and exchanging heat with the heat storage body of the heat storage chamber 32b to lower the temperature to 100 ° C. to 150 ° C., it is dissipated into the atmosphere from an exhaust pipe (not shown). Thereafter, the operation of sequentially switching the supply of combustion air and the exhaust of combustion exhaust gas between the supply and exhaust nozzles 164a and 164b every predetermined time continues for a predetermined time.

  On the other hand, when the lid 14 is opened and closed (when the combustion of the regenerative burner device 16 is stopped), as shown in FIG. 6, the electric cylinder 66 is driven to connect the second duct 35b (35a) to the first duct 34b (34a The carriages 50a and 50b are moved in a direction away from () to release the pressing of the seal portion 40b (40a) interposed in the facing portion 38b (38a).

  In the ladle preheating device 1 of the present embodiment configured as described above, when the lid 14 is opened and closed, the first ducts 34a and 34b rotate with respect to the second ducts 35a and 35b on the fixed side. Since it tilts around the shaft 22, the displacement accompanying the opening / closing operation of the lid 14 can be sufficiently absorbed without damaging the entire ducts 30a, 30b.

  Further, since the heat storage chambers 32a, 32b on the end side of the second ducts 35a, 35b are placed at positions irrelevant to the opening / closing of the lid 14, an increase in the weight of the lid 14 can be suppressed. As a result, an opening / closing mechanism with high power is not required, and the overall size of the facility can be suppressed. In addition, there is a problem that the heat storage member spills from the heat storage chambers 32a and 32b when the lid 14 is opened, and when the lid 14 returns from the open state to the closed state, the upper surface of the heat storage body does not become flat, The problem that the combustion air passing through 32b or the combustion exhaust gas drifts can be prevented.

  Further, the second ducts 35a and 35b are configured to be close to and away from the first ducts 34a and 34b in the axial direction. In addition, first flanges 344a and 344b and second flanges 354a and 354b are provided on the outer peripheral edge portions of the first ducts 34a and 34b and the second ducts 35a and 35b facing each other, and the opposing portions 38a and 38b are provided on the facing portions 38a and 38b. Seal portions 40a and 40b are interposed.

  For this reason, when operating the ladle preheating device 1, the carriages 50a and 50b are moved to the first ducts 34a and 34b, and the first flanges 344a and 344b and the second flanges 354a and 354b are brought close to each other. By pressing the seal portions 40a, 40b interposed in the portions 38a, 38b, it is possible to prevent the gas flowing through the first and second ducts 34a, 34b, 35a, 35b from leaking outside.

  On the other hand, when the lid 14 is opened and closed, the carriages 50a and 50b are moved in a direction in which the second ducts 35a and 35b are separated from the first ducts 34a and 34b, and the seal portions 40a and 40b interposed in the facing portions 38a and 38b are moved. By releasing the pressing of 40b, it is possible to prevent damage to the end faces of the seal portions 40a and 40b and the opposing first and second ducts 34a, 34b, 35a and 35b when the lid 14 is opened and closed.

  Next, the detailed structure of the seal portions 40a and 40b will be described. As shown in FIG. 5 and FIG. 6, the inner surface of the first flange 344 b (344 a) that faces the second flange 354 b (354 a) is annular and has an U-shaped inner packing holding portion. 41b (41a) and the outer packing holding part 42b (42a) are attached via a base plate 44b (44a).

  A hollow water-cooled jacket 70b (70a) is formed on the back surface side of the base portion of the first flange 344b (344a) and on the outer periphery of the first duct 34b (34a). A plurality of ribs 72b (72a) arranged at equal intervals in the circumferential direction are fixed to the back surface of the first flange 344b (344a) and the upper surface of the water cooling jacket 70b (70a).

  As shown in the drawing, in each recess of the inner packing holding portion 41b (41a) and the outer packing holding portion 42b (42a), an inner packing (inner gasket) 45b (45a) having an annular shape and a square cross section is provided. An outer packing (outer gasket) 46b (46a) is held. The inner packing 45b (45a) and the outer packing 46b (46a) are made of an elastic material having heat resistance.

  The material of the inner packing 45b (45a) and the outer packing 46b (46a) is preferably silicon rubber which is excellent in heat resistance and stability against temperature change. Specifically, the inner packing 45b (45a) and the outer packing 46b (46a) are configured by covering the outside of a sponge member obtained by foaming silicon rubber with silicon rubber.

  As shown in the drawing, a bracket 76b (76a) to which a cylindrical member 75b (75a) is fixed is attached to the upper end of a base 74b (74a) having an inverted L-shaped cross section. A second flange 354b (354a) is attached to the end of the cylindrical member 75b (75a) on the side facing the first flange 344b (344a).

  In the second flange 354b (354a), the surface facing the first flange 344b (344a) and at the position facing the inner packing 45b (45a) and the outer packing 46b (46a), a pair of annular protrusions 77b (77a) and 78b (78a) are formed.

  When the second duct 35b (35a) is brought close to the first duct 34b (34a), the annular protrusions 77b (77a) and 78b (78a) are arranged on the inner and outer packings 45b (45a) and 46b (46a). ) To elastically deform (compress) the inner and outer packings 45b (45a) and 46b (46a).

  A heat insulating material 304 that blocks heat from the inside of the duct is attached to the inner peripheral surface of the cylindrical member 75b (75a). A hollow water cooling jacket 80b (80a) is formed on the outer peripheral surface of the cylindrical member 75b (75a). Similar to the first flange 344b (344a), a plurality of ribs 82b (82a) arranged at equal intervals in the circumferential direction on the back surface of the second flange 354b (354a) and the upper surface of the water cooling jacket 80b (80a). ) Is fixed.

  As shown in FIG. 5, when the first flange 344b (344a) and the second flange 354b (354a) are brought close to each other and the seal portion 40b (40a) interposed in the facing portion 38b (38a) is pressed, an annular shape is formed. A space 48b (48a) is formed. As shown in the drawing, an air supply pipe 90b (90a) that feeds purge air (gas) into the annular space 48b (48a) at a position facing the annular space 48b (48a) in the second flange 354b (354a). ) Is provided.

  When the positional relationship between the first duct 34b (34a) and the second duct 35b (35a) is in the state shown in FIG. 5 (that is, when the ladle preheating device 1 is operated), the air duct 90b (90a) is annular. The purge air is constantly sent into the space 48b (48a).

  At that time, the pressure of the purge air fed into the annular space 48b (48a) from the air pipe 90b (90a) is P1, and the pressure in the first and second ducts 34b (34a) and 35b (35a) through which the gas flows. Is set to P2, it is preferable to set the relationship of P1> P2.

  With such a configuration, the axis of the first duct 34b (34a) and the axis of the second duct 35b (35a) are deviated from each other, and the first and second flanges 344b (344a) are misaligned. ) Even when a gap is generated between 354b (354a), since the relationship between P1 and P2 is set as P1> P2, the first and second ducts 34b (34a), 35b ( 35a) The high-temperature combustion air preheated by heat exchange with the heat accumulator circulating in the interior does not leak outside through the gap.

  On the other hand, when the hot combustion exhaust gas in the ladle 12 is sucked and exhausted through the first and second ducts 34b (34a) and 35b (35a), the first and second ducts 34b (34a) and 35b ( Since the inside of 35a) has a negative pressure, the purge air sent from the air supply pipe 90b (90a) to the annular space 48b (48a) is sucked into the first and second ducts 34b (34a) and 35b (35a). Therefore, the high-temperature combustion exhaust gas does not leak outside through the gap.

  In the present embodiment, the example in which the inner packings 45a and 45b and the outer packings 46a and 46b constituting the seal portions 40a and 40b are provided on the surfaces of the first flanges 344a and 344b has been described. It is also possible to provide the inner packings 45a and 45b and the outer packings 46a and 46b on the surfaces of the second flanges 354a and 354b. Moreover, although the example which attached air supply pipe | tube 90a, 90b to 2nd flange 354a, 354b was demonstrated, not only this but air supply pipe | tube 90a, 90b is attached to 1st flange 344a, 344b, and annular space 48a, 48b. It is also possible to feed purge air into the pipe.

  In addition to the ladle preheating device described in the embodiment, the molten vessel container heating device according to the present invention is also applicable as a tundish preheating device that preheats the tundish that is received from the ladle and distributed to the mold. .

DESCRIPTION OF SYMBOLS 1 Ladle preheating apparatus 10 Opening part 12 Ladle 14 Cover 16 Heat storage type burner apparatus 20a, 20b Tilt arm 22 Rotating shaft 24a, 24b Bearing 30a, 30b Duct 31 Fuel supply pipe 32a, 32b Heat storage chamber 34a, 34b 1st duct 35a, 35b Second duct 38a, 38b Opposing portion 40a, 40b Sealing portion 41a, 41b Inner packing holding portion 42a, 42b Outer packing holding portion 45a, 45b Inner packing 46a, 46b Outer packing 48a, 48b Annular space 50a, 50b 77a, 77b to 78a, 78b Annular projections 90a, 90b Air supply pipes 164a, 164b Air supply / exhaust nozzles 166 Fuel injection nozzles 340a, 340b First bent portions 342a, 342b First openings 344a, 344b First flanges 352a, 35 b second opening 353a, 353b second bent portion 354a, 354b second flange

Claims (5)

A molten metal container having an upper opening;
A lid that has an opening and closing mechanism and tilts a predetermined angle around a rotating shaft that is rotatably supported via a bearing to open and seal the upper opening;
The lid has an opening whose one end is opened in the molten metal container and the other end is opened to the outside of the molten metal container, and a pair of supply air for alternately supplying the combustion air and exhausting the combustion exhaust gas via the heat storage body. An exhaust nozzle, and a fuel ejection nozzle that ejects fuel into the molten metal container,
A pair of ducts having a heat storage chamber for storing the heat storage body is connected to the pair of supply / exhaust nozzles,
The portion of the pair of ducts where the heat storage chamber is formed is disposed at a predetermined position different from the lid, and the apparatus for heating a molten metal container. Each of the pair of ducts includes a first duct disposed on the lid and a second duct having the heat storage chamber,
The first duct has a first end connected to the supply / exhaust nozzle, a second end provided coaxially with the rotating shaft,
The second duct has a first end coaxially opposed to a second end of the first duct, a second end connected to the heat storage chamber,
The apparatus for heating a molten metal container according to claim 1, wherein a seal portion is interposed between opposing portions of the second end of the first duct and the first end of the second duct.   The apparatus for heating a molten metal container according to claim 2, wherein the second duct is configured to be capable of approaching and separating in the axial direction with respect to the first duct. The facing portion is composed of a pair of flanges provided at outer peripheral edge portions of the first duct and the second duct,
The said seal | sticker part is a heating apparatus of the molten metal container of Claim 2 or Claim 3 provided in the at least one flange surface of a pair of said flange. The seal portion is composed of an annular inner gasket and an outer gasket made of an elastic material,
An air supply means for supplying gas to an annular space formed by one end face of the inner gasket and the outer gasket and the other flange face;
The relationship between the two is P1> P2, where P1 is the pressure of the gas supplied from the air supply means, and P2 is the internal pressure of the duct when the combustion air flows through the duct. The heating apparatus of the molten metal container of any one of Claim 4.

Images