TWI630275B - Fuel supply device - Google Patents

Abstract

The fuel supply device (10) includes a tubular member (30) that can be attached to a mounting portion of the air supply duct (4) provided in the blast furnace (1), and a rotating member (40) that is hollow and rotatably housed in The inside of the cylindrical member (30), the fuel is supplied from the base end portion thereof to the inside; the pipe member (20) is detachably attached to the end edge of the blast furnace (1) side of the rotating member (40), and the fuel The front end portion is supplied into the blast furnace (1); the cover member (60) is detachably attached to the tubular member (30), and the rotating member (40) is housed inside the cylindrical member (30). .

Description

Fuel supply device

The present invention relates to a fuel supply device for blowing a fuel such as pulverized coal into a furnace or the like from a tuyere of a blast furnace.

In order to reduce the amount of coal char used in the blast furnace, fuel such as pulverized coal or heavy oil is blown into the furnace from the tuyere for combustion. The fuel such as pulverized coal is blown into the blast furnace together with the hot air via a pulverized coal burner (hereinafter, simply referred to as a burner), and the pulverized coal burner is disposed in a state of being inserted through a blow pipe attached to the tuyere. .

Since the conventional burner is exposed to a high temperature, it is formed of a material having high heat resistance such as SUS (stainless steel-material) material or a special metal material, but there is still a case where the blow pipe of the burner is bent due to heat. Troubled, there are problems such as damage to the tuyere or reduced combustion efficiency. In this case, in the past, when the blower tube was replaced with a new one, the amount of the blown pipe was changed to a new one. Therefore, the replacement of the burner must be stopped, and the amount of blown air must be reduced to replace the blower. Economically speaking, it is not a small burden.

In order to solve such problems, in the Japanese patent The burner disclosed in No. 5,105,293, which is susceptible to deformation, can be rotated around the shaft by slightly weakening the thrust of the spring. In such a burner, the blow pipe can keep the position of the curved portion from being properly rotated in the airtight state when the heat is being bent, so that the blow pipe can be prevented from continuing to bend in the same direction, and since the blow pipe can be kept for a long time Since the blow pipe is maintained in a substantially straight shape, it is possible to effectively prevent the damage of the tuyere and reduce the combustion efficiency.

In the blast furnace, the air supply is stopped for 12 hours to 72 hours once every one to two months, so as to facilitate the overall maintenance of the blast furnace. In addition, the supply of air is stopped when the production adjustment is necessary. When the blast furnace is stopped to supply air, the supply of high-temperature hot air and fuel such as pulverized coal to the inside of the blast furnace is also stopped, and the production is stopped. In addition, when the blast furnace is stopped to supply air, the burner is also repaired. Specifically, the burner is removed from the blow pipe of the blast furnace, and the blow pipe is removed from the flange of the burner. However, since the blower, the adapter, and the sleeve are integrated in the burner disclosed in Patent Document 1, the adapter is also removed when the blower is removed from the flange, so that the flange and the adapter are provided. The sealing surface between each other (specifically, the inclined surface formed on the entire circumference of the outer peripheral portion of the front end of the adapter and the inclined surface formed on the entire circumference of the inner peripheral portion of the rear end of the threaded cylinder of the flange) are exposed. When such a sealing surface is exposed, there is a fear that dirt adheres to the sealing surface or the sealing surface is scratched. In this case, there is a problem that gas and dust leak from the sealing surface in the mechanical operation of the blast furnace. because Therefore, the field operator must tighten the nerves to work during the maintenance of the burner, and the load on the field operator is large.

The present invention has been made in view of the above problems, and an object thereof is to provide a fuel supply device capable of effectively preventing a damage of a tuyere of a blast furnace and a reduction in combustion efficiency by maintaining a substantially straight line member for a long period of time. Further, since it is possible to prevent the sealing surface provided between the cylindrical member (the mounting portion attached to the flange of the air supply duct provided in the blast furnace) and the rotating member (accommodating the inside of the cylindrical member) from being exposed, only the tube is replaced. The road components can reduce the load on the field workers.

The fuel supply device of the present invention is characterized in that it includes a tubular member that can be attached to a mounting portion of a blower provided in the blast furnace, and a rotating member that is rotatably and rotatably housed inside the tubular member. The base member is supplied to the inside from the base end portion; the pipe member is detachably attached to the edge of the blast furnace side of the rotating member, fuel is supplied from the front end portion to the blast furnace; and the cover member is detachable The second cylindrical sealing member is detachably housed in the cylindrical member, and the first sealing surface is provided inside the cylindrical member, and the second sealing surface is provided on the rotating member, and the second sealing surface is provided. When it is accommodated in the inside of the cylindrical member, it contacts the first sealing surface, and a seal is formed between the first sealing surface and the first sealing surface.

According to the above-described fuel supply device, since the pipe member is detachably attached to the end edge of the turret side of the rotating member that is rotatably housed inside the tubular member, the cause of the pipe member is When the heat is bent, the pipe member is appropriately rotated in the airtight state to change the position of the bent portion, and the pipe member can be maintained substantially linear for a long period of time, thereby effectively preventing damage and combustion efficiency of the tuyere of the blast furnace. The reduction. In addition, it is possible to replace only the sealing surface provided between the tubular member (the mounting portion attached to the flange of the air supply duct provided in the blast furnace) and the rotating member (accommodating the inside of the cylindrical member). Pipeline components, so the load on the field operator can be reduced.

In the fuel supply device of the present invention, the fuel supplied to the inside of the rotating member may be pulverized coal, waste plastic, hydrogen or heavy oil.

The fuel supply device of the present invention may further include a biasing member that biases the second sealing surface of the rotating member toward the first sealing surface of the tubular member.

In this case, the elastic member may be a spring, and the second sealing surface of the rotating member may be biased toward the first sealing surface of the tubular member by a restoring force from a compressed state of the spring.

In the fuel supply device of the present invention, the first engaged portion may be provided on the inner surface of the tubular member, and the first engaging portion that is engageable with the first engaged portion may be provided in the cover member.

In the fuel supply device of the present invention, the second engaging portion may be provided at a proximal end portion of the pipe member, and the second engaged portion that is engaged with the second engaging portion may be provided in the rotating member.

It can also be used in the fuel supply device of the present invention. An operation portion in which the rotating member rotates is attached to the rotating member.

In the fuel supply device of the present invention, a locking portion that locks the tubular member and the cover member in an engaged state may be provided.

1‧‧‧ blast furnace

2‧‧‧ vents

3‧‧‧Hot air stove

4‧‧‧Air duct

10‧‧‧fuel supply device (pulverized coal burner)

20‧‧‧Pipe components (dry pipe)

22‧‧‧ Male threaded part

30‧‧‧Cylinder member (sleeve)

32‧‧‧ raised parts

34‧‧‧1st sealing surface

36‧‧‧Female threaded part

38‧‧‧ leaves

39‧‧‧Locking holes

40‧‧‧Rotary components (adapters)

42‧‧‧Female thread part (2nd engaged part)

44‧‧‧2nd sealing surface

50‧‧‧ Spring

60‧‧‧ cover members

62‧‧‧ Male threaded part

66‧‧‧Lock pin

70‧‧‧Operation Department

72‧‧‧Operated part

80‧‧‧Hose

FIG. 1 is a schematic structural view showing a structure of a blast furnace in which fuel such as pulverized coal is supplied to a fuel supply device according to an embodiment of the present invention.

Fig. 2 is a side view showing the structure of a fuel supply device according to an embodiment of the present invention.

Fig. 3 is a vertical cross-sectional view showing the internal structure of the fuel supply device shown in Fig. 2 in an enlarged manner.

Fig. 4 is an exploded view of each component of the fuel supply device shown in Fig. 2;

Fig. 5 is a perspective view showing a state in which the cover member is attached to the tubular member of the fuel supply device shown in Fig. 2 .

Fig. 6 is a perspective view showing a state in which the cover member is attached to the tubular member of the fuel supply device shown in Fig. 2 .

Fig. 7 is a vertical cross-sectional view showing a state in which the tip end of the piping member of the fuel supply device shown in Fig. 2 is bent in the tuyere of the blast furnace.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Line description. 1 to 7 are views showing a fuel supply device according to the present embodiment and a blast furnace in which fuel such as pulverized coal is supplied by the fuel supply device. In the first embodiment, a schematic structural view of a structure of a blast furnace in which fuel such as pulverized coal is supplied by the fuel supply device according to the present embodiment is schematically shown, and FIG. 2 is a view showing a structure of the fuel supply device according to the present embodiment. Side view. In addition, FIG. 3 is a longitudinal cross-sectional view showing an enlarged internal structure of the fuel supply device shown in FIG. 2, and FIG. 4 is an exploded view of each component of the fuel supply device shown in FIG. In addition, FIG. 5 is a perspective view showing a state in which the cover member is attached to the tubular member of the fuel supply device shown in FIG. 2, and FIG. 6 is a view showing the cover member attached to the fuel supply device shown in FIG. A perspective view of the state of the member. In addition, Fig. 7 is a vertical cross-sectional view showing a state in which the tip end of the piping member of the fuel supply device shown in Fig. 2 is bent in the tuyere of the blast furnace.

First, the structure of the blast furnace 1 in which the fuel such as pulverized coal is supplied to the fuel supply device 10 according to the present embodiment will be described with reference to Fig. 1 . The blast furnace 1 is a vertical cylindrical structure in which an outer surface is covered with a steel sheet and a refractory is used as a lining. About 20 to 50 air outlets 2 of the water-cooled copper are radially attached to the side wall portion of the furnace bottom of the blast furnace 1, and the air outlet is heat sent through the air supply duct 4 such as the hot air furnace 3 and the hot air duct. The wind blows into the furnace. Further, the tap hole and the slag tap for taking out the molten iron and the slag are separately provided at the lower portion of the tuyere 2. The fuel such as pulverized coal is blown into the furnace from the fuel supply device 10 (pulverized coal burner) according to the present embodiment from such a tuyere 2 . Specifically, the duct is disposed in the tuyere 2 of the blast furnace 1 and the piping of the fuel supply device 10 The member 20 (described later) is fitted inside the blow pipe, and the front end portion of the pipe member 20 is directly opposed to the furnace from the tuyere 2.

Next, the structure of the fuel supply device 10 (pulverized coal burner) according to the present embodiment will be described with reference to FIGS. 2 to 6 . The fuel supply device 10 according to the present embodiment includes a tubular member 30 (sleeve) that can be attached to a mounting portion (not shown) such as a flange of the air supply duct 4 of the blast furnace 1, and a rotating member 40 ( The adapter is housed in a hollow shape and rotatably housed inside the tubular member 30, and the fuel is supplied from the base end portion thereof to the inside; the pipe member 20 (the blow pipe) is detachably attached to the rotating member. The end edge of the blast furnace 1 side of 40 is supplied with fuel from the front end portion thereof into the blast furnace 1; the cover member 60 is detachably attached to the tubular member 30, and the rotating member 40 is housed inside the cylindrical member 30. . In addition, the spring 50 is provided as a biasing member that biases the second sealing surface 44 (described later) of the rotating member 40 toward the first sealing surface 34 (described later) of the tubular member 30 in the cylindrical member 30. Further, the operation portion 70 for rotating the rotating member 40 is attached to the rotating member 40 by, for example, welding. Hereinafter, each constituent member of the fuel supply device 10 as described above will be described in detail.

The pipe member 20 (the blow pipe) is an elongated pipe formed of a heat resistant material such as stainless steel. A male screw portion 22 (second engaging portion) such as a screw is formed on the outer peripheral surface of the proximal end portion of the pipe member 20 (in other words, the portion attached to the rotating member 40) (see FIG. 3). Further, a pipe is formed on the inner peripheral surface of the front end portion (in other words, the portion close to the blast furnace 1 side) of the hollow-shaped rotating member 40, which will be described later. The female screw portion 42 (second engaged portion) such as a screw hole into which the male screw portion 22 such as a thread of the member 20 is screwed. Thereby, the pipe member 20 is detachably attached to the end edge of the rotating member 40 on the blast furnace 1 side, and the internal space of the pipe member 20 and the inside of the rotating member 40 when the pipe member 20 is attached to the rotating member 40 The space forms a connection.

A plurality of (for example, three) boss portions 32 for attaching to a mounting portion (not shown) such as a flange of the air supply duct 4 of the blast furnace 1, from the blast furnace 1 side of the outer peripheral surface of the tubular member 30 The vicinity of the end edge is radially extended and attached to the outer peripheral surface of the cylindrical member 30 (sleeve). By providing the plurality of boss portions 32 in the cylindrical member 30, the cylindrical member 30 can be fixed to the air supply duct 4 of the blast furnace 1 by rotating the boss portions 32 in the holes of the mounting portion. Further, the tubular member 30 may be fixed to the air supply duct 4 of the blast furnace 1 by a wedge such as a cheese, instead of when the tubular member 30 is fixed to the air supply duct 4 of the blast furnace 1, Each of the bosses 32 is fitted into a hole of the mounting portion to rotate. Further, a plurality of (for example, four) blades 38 are radially extended to be attached to the outer peripheral surface of the tubular member 30. Further, a first sealing surface 34 is provided around the entire circumference of the cylindrical member 30. The first sealing surface 34 is an inclined surface that is inclined with respect to the longitudinal direction of the tubular member 30 (in other words, the left-right direction on the third and fourth drawings). Further, the cover member 60 attached to the tubular member 30 is formed on the outer periphery of the tubular member 30 by the two locking holes 39 which are locked by the rod-shaped locking pin 66 in the engaged state. The vicinity of the base end portion of the surface (in other words, the portion farther from the blast furnace 1) (see Figs. 5 and 6).

As shown in FIGS. 3 and 4, when the inside of the tubular member 30 is housed, the first sealing surface 44 is formed to be in contact with the first sealing surface 34, and the first sealing surface 44 is sealed with the first sealing surface 34. It is an intermediate position in the longitudinal direction of the outer peripheral surface of the rotating member 40 (converter) of a hollow shape. The second sealing surface 44 is an inclined surface that is inclined with respect to the longitudinal direction of the rotating member 40 (in other words, the left-right direction on the third and fourth drawings). When the rotating member 40 is housed in the inside of the tubular member 30, the first sealing surface 34 and the second sealing surface 44 are in close contact with each other, thereby preventing gas and dust from leaking from between the tubular member 30 and the rotating member 40 and flowing out. The exterior of the tubular member 30. Further, the operation unit 70 to be described later is attached to the base end portion of the rotary member 40 (in other words, the end portion farther from the blast furnace 1) by, for example, welding, and the rotary member 40 can be made of the rotary member 40 at the cylindrical member 30 by the operation portion 70. Internal rotation.

The cover member 60 is detachably attached to the base end portion of the tubular member 30 (in other words, the end portion farther from the blast furnace 1), and the rotary member 40 is housed when the cover member 60 is attached to the tubular member 30. The inside of the tubular member 30. More specifically, as shown in FIGS. 4 and 5, the male screw portion 62 (first engaging portion) such as a screw is formed at the front end portion of the cover member 60 (in other words, the portion close to the blast furnace 1 side). The outer perimeter. In the inner peripheral surface of the proximal end portion of the tubular member 30, a female screw portion 36 (first engaged portion) such as a screw hole into which the male screw portion 62 such as a thread of the cover member 60 is screwed is formed. Thereby, the cover member 60 can be detachably attached to the base end portion of the tubular member 30. Further, as shown in FIG. 6, by the state in which the cover member 60 is attached to the tubular member 30, The rod-shaped locking pin 66 is fitted into the two locking holes 39 so that the cover member 60 attached to the tubular member 30 can be locked in the engaged state (refer to Fig. 6). In the present embodiment, the locking holes 39 and the locking pins 66 constitute a locking portion that locks the tubular member 30 and the lid member 60 in the engaged state.

As shown in FIG. 3, the spring 50 is positioned inside the cylindrical member 30 and housed around the rotating member 40, and one end of the spring 50 is in contact with the cover member 60. Here, the rotating member 40 and the spring 50 are housed inside the tubular member 30, and when the cover member 60 is attached to the proximal end portion of the tubular member 30, the spring 50 is in a compressed state by the spring 50 from The restoring force in the compressed state causes the rotating member 40 to be pressed in the left direction on the third drawing. Thereby, the second sealing surface 44 of the rotating member 40 is pressed against the first sealing surface 34 of the tubular member 30, and the first sealing surface 34 and the second sealing surface 44 are more firmly adhered to each other. In this manner, the spring 50 functions as a biasing member that biases the second sealing surface 44 of the rotating member 40 toward the first sealing surface 34 of the tubular member 30, because the spring 50 as such a biasing member allows Since the first sealing surface 34 and the second sealing surface 44 are more firmly adhered to each other, it is possible to more reliably prevent gas and dust from leaking from between the first sealing surface 34 and the second sealing surface 44.

The operation portion 70 is constituted by a hollow-shaped member which is attached to the base end portion of the rotary member 40 (in other words, a portion farther from the blast furnace 1) by, for example, welding. Further, the internal space of the operation portion 70 and the internal space of the rotating member 40 communicate with each other. In addition, operation The portion 70 has an operated portion 72 having a polygonal cross section (for example, a hexagonal shape), and the operation portion 70 is rotated by hooking a chain (not shown), a large table, or the like to the operated portion 72. The pipe member 20 and the rotating member 40 are integrally rotated in a state in which the member 30 is attached to a mounting portion such as a flange of the air supply duct 4 of the blast furnace 1. Further, the fuel supply hose 80 is connected to the operation unit 70, and fuel such as pulverized coal is supplied from the hose 80 to the internal space of the operation unit 70. In addition, after the hollow tube is attached to the operation portion 70, the hose 80 may be attached to the hollow tube, or the valve 80 may be attached to the operation portion 70, and the hose 80 may be attached to the valve instead of directly connecting the hose 80. It is connected to the operation unit 70. Further, the flexible hose may be directly connected to the operation unit 70, and the fuel may be supplied from the flexible hose to the internal space of the operation unit 70.

Next, a method of assembling the fuel supply device 10 as described above will be described with reference to FIGS. 4 to 6 . In addition, in FIG. 5 and FIG. 6, the illustration of the piping member 20 and the hose 80 is abbreviate|omitted in order to view a figure easily.

When assembling the fuel supply device 10, first, the rotating member 40 and the spring 50 are housed inside the tubular member 30. At this time, the spring 50 is housed around the rotating member 40. FIG. 5 is a view showing a state in which the rotating member 40 and the spring 50 are housed inside the tubular member 30. Thereafter, the cover member 60 is attached to the proximal end portion of the tubular member 30 so that the rotating member 40 and the spring 50 are not exposed to the outside from the proximal end portion of the tubular member 30. Specifically, the male screw portion 62 of the screw member or the like of the cover member 60 is screwed to the female screw portion of the screw hole or the like of the tubular member 30. 36. Thereafter, the operation portion 70 to which the hose 80 for fuel supply is attached is attached to the proximal end portion of the rotary member 40 by, for example, welding. In addition, FIG. 6 is a view showing a state in which the cover member 60 is attached to the proximal end portion of the tubular member 30. Finally, the base end portion of the pipe member 20 is attached to the front end portion of the rotating member 40. Specifically, the male screw portion 22 such as a screw of the pipe member 20 is screwed to the female screw portion 42 of the screw hole or the like of the rotary member 40. In this way, the fuel supply device 10 as shown in FIGS. 2 and 3 is assembled.

Next, a method of using the fuel supply device 10 will be described. When fuel such as pulverized coal is supplied to the furnace of the blast furnace 1 by using the fuel supply device 10, first, the boss portions 32 of the tubular member 30 are attached to the mounting portion of the flange or the like of the air supply duct 4 provided in the blast furnace 1. . At this time, the piping member 20 of the fuel supply device 10 is fitted inside the blow pipe provided in the tuyere 2 of the blast furnace 1. Thereby, the front end portion which is disposed as the pipe member 20 is directly opposed to the inside of the furnace from the tuyere 2. Further, fuel such as pulverized coal is supplied to the internal space of the operation unit 70 by the hose 80 for fuel supply. Thereby, the fuel is blown into the furnace of the blast furnace 1 from the front end portion of the piping member 20 via the internal space of the operation portion 70, the internal space of the rotating member 40, and the internal space of the piping member 20.

When the piping member 20 of the fuel supply device 10 is used for a long period of time, there is a concern that the piping member 20 is bent due to heat as shown in FIG. 7 and is in contact with the tuyere 2 or the like. In this regard, in the present embodiment, when the pipe member 20 is about to be bent due to heat, the pipe member 20 and the rotating member 40 can be made by the operating portion 70. The rotation is integrally performed, so that the position at which the front end portion of the pipe member 20 is exposed to the high heat portion can be changed. In this manner, by appropriately rotating the pipe member 20, the entire area in the circumferential direction of the pipe member 20 is uniformly heated, and it is possible to suppress the pipe member 20 due to its own weight in the high-temperature ambient gas such as bending in a single direction. Deformation.

Next, a method of repairing the fuel supply device 10 will be described. In the fuel supply device 10 according to the present embodiment, since the piping member 20, particularly the front end portion, is exposed to the heat temperature in the blast furnace 1 and is easily damaged, it is necessary to replace it frequently. When the piping member 20 is replaced as such, since the piping member 20 is detachably attached to the rotating member 40, it is not necessary to detach the cover member 60 from the tubular member 30 and to accommodate the rotating member 40 in the tubular shape. Only the pipe member 20 is detached in the state of the inside of the member 30. With this configuration, the pipe member 20 can be replaced in a state in which the first sealing surface 34 of the tubular member 30 and the second sealing surface 44 of the rotating member 40 are in close contact with each other, so that contamination can be prevented from adhering to the first sealing surface 34. The second sealing surface 44 or the first sealing surface 34 and the second sealing surface 44 may be damaged.

On the other hand, in the fuel supply device 10 according to the present embodiment, the rotating member 40 is replaced once every one year due to wear. When the rotating member 40 is replaced, since the cover member 60 is detachably attached to the tubular member 30, the rotating member 40 can be replaced only by removing the cover member 60 from the tubular member 30, which can reduce the number of workers on site. The load on the replacement work of the tubular member 30.

According to the present embodiment constituted by the above-described structure In the fuel supply device 10, the hollow-shaped rotating member 40 to which the fuel is supplied from the base end portion thereof is rotatably housed inside the cylindrical member 30, and the fuel is supplied from the front end portion thereof to the piping member in the blast furnace 1. 20 is attached to the edge of the blast furnace 1 side of the rotating member 40, and the cover member 60 which accommodates the rotating member 40 in the inside of the cylindrical member 30 is detachably attached to the cylindrical member 30. Therefore, when the pipe member 20 is to be bent due to heat, the pipe member 20 can be maintained substantially linear for a long time by changing the position of the bent portion by appropriately rotating the pipe member 20 while maintaining the airtight state. Therefore, it is possible to effectively prevent the damage of the tuyere 2 of the blast furnace 1 and the reduction of the combustion efficiency, and it is not necessary to provide the cylindrical member 30 (the mounting portion attached to the flange of the air supply duct 4 provided in the blast furnace 1 or the like) and The sealing faces between the rotating members 40 (specifically, the first sealing faces 34 and the second sealing faces 44) are exposed and only the pipe member 20 is replaced, so that the load on the field worker can be reduced. In other words, the cover member 60 functions as a cover that protects the first sealing surface 34 and the second sealing surface 44.

Further, in the fuel supply device 10 of the present embodiment, as described above, the fuel supplied to the inside of the rotating member 40 is pulverized coal. Further, the fuel supplied to the inside of the rotating member 40 is not limited to the pulverized coal, and other types of fuel such as waste plastics, hydrogen, and heavy oil may be supplied to the inside of the rotating member 40.

Further, in the fuel supply device 10 of the present embodiment, as described above, the spring 50 is provided as a biasing member that biases the second sealing surface 44 of the rotating member 40 toward the first sealing surface 34 of the tubular member 30. With The second sealing surface 44 of the rotating member 40 is biased toward the first sealing surface 34 of the tubular member 30 by the restoring force from the compressed state of the spring 50. In this case, since the first sealing surface 34 and the second sealing surface 44 are more firmly adhered to each other, it is possible to more reliably prevent gas and dust from leaking from between the first sealing surface 34 and the second sealing surface 44. Further, in the fuel supply device 10 of the present embodiment, the elastic member that biases the second sealing surface 44 of the rotating member 40 toward the first sealing surface 34 of the tubular member 30 is not limited to the spring 50. If the second sealing surface 44 of the rotating member 40 can be biased toward the first sealing surface 34 of the tubular member 30, another type of member (for example, an elastic member such as a leaf spring) may be used as the biasing member.

Further, in the fuel supply device 10 of the present embodiment, as described above, the female screw portion 36 is provided on the inner surface of the tubular member 30 as the first engaged portion, and the male screw portion 62 is provided in the cover member 60 as the cover member 60. The first engaging portion of the female screw portion 36 is engageable. Further, the fuel supply device 10 of the present embodiment is not limited to the structure in which the first engaged portion is the female screw portion 36 and the first engaging portion is the male screw portion 62, and the cover member 60 can be attached. In the case of the tubular member 30, other types of members may be used as the first engaging portion and the first engaged portion.

Further, in the fuel supply device 10 of the present embodiment, as described above, the male screw portion 22 is provided at the proximal end portion of the pipe member 20 as the second engagement portion, and the female screw portion 42 is provided in the rotary member 40 as The second engaged portion that the male screw portion 22 is engaged with. Further, the fuel supply device 10 of the present embodiment is not limited to the second engagement portion. The male screw portion 22 and the second engaged portion are in the same manner as the female screw portion 42. If the pipe member 20 can be attached to the rotating member 40, other types of members can be used as the second engaging portion and the second member. Being engaged.

Further, in the fuel supply device 10 of the present embodiment, as described above, the operation portion 70 for rotating the rotating member 40 is attached to the rotating member 40. With this operation, the operator can easily rotate the rotating member 40 housed in the cylindrical member 30 (attached to the mounting portion of the air supply duct 4 provided in the blast furnace 1) by the operation unit 70, whereby the piping can be easily formed. Member 20 rotates.

Further, in the fuel supply device 10 of the present embodiment, the lock hole 39 and the lock pin 66 are provided as the lock portion for locking the tubular member 30 and the cover member 60 in the engaged state as described above. . By providing such a locking portion, the cover member 60 can be prevented from being released from the tubular member 30 during use of the fuel supply device 10.

Further, the fuel supply device 10 according to the present embodiment is not limited to the above-described aspects, and various modifications can be made.

For example, in the above description, an example in which the spring 50 is housed around the rotating member 40 in the inside of the tubular member 30 will be described. However, the fuel supply device 10 according to the present embodiment may be omitted. The setting of the spring 50. Further, when the rotating member 40 is rotated, the rotating member 40 may be rotated by means other than the operating unit 70.

Claims (7)

A fuel supply device includes a tubular member that can be attached to a mounting portion of a blower provided in a blast furnace, and a rotating member that is rotatably housed inside the tubular member and that is supplied with fuel from a base end portion thereof. To the inside; a pipe member is detachably attached to an end edge of the rotating member on the blast furnace side, fuel is supplied from the front end portion to the blast furnace; and a cover member is detachably attached to the barrel The rotating member is housed inside the cylindrical member, the first sealing surface is provided inside the tubular member, and the second sealing surface is provided on the rotating member, and the second sealing surface is housed in the aforementioned The inside of the tubular member is in contact with the first sealing surface, and a seal is formed between the first sealing surface, and the second engaging portion is provided at a proximal end portion of the conduit member, and is engaged with the second card. The second engaged portion of the joint portion is provided in the rotating member. A fuel supply device according to claim 1, wherein the fuel supplied to the inside of the rotating member is pulverized coal, waste plastic, hydrogen or heavy oil. The fuel supply device according to the first or second aspect of the invention, further comprising an elastic member that biases the second sealing surface of the rotating member toward the first sealing surface of the tubular member. The fuel supply device according to claim 3, wherein the elastic member is a spring, and the second sealing surface of the rotating member faces the cylindrical member by a restoring force from a compressed state of the spring The first sealing surface is pressed. The fuel supply device of the first aspect of the invention, wherein the first engaged portion is provided on an inner surface of the tubular member, and the first engaging portion that is engageable with the first engaged portion is provided in the Cover member. A fuel supply device according to claim 1, wherein an operation portion for rotating the rotating member is attached to the rotating member. A fuel supply device according to claim 1, wherein a locking portion that locks the tubular member and the cover member in an engaged state is provided.