ES2767507T3 - Fuel feeding device - Google Patents

Abstract

A fuel feeding apparatus (10) comprising: a cylinder (30) applicable to a mounting portion of a blast tube of a blast furnace; a hollow rotary member (40) rotatably housed in the cylinder (30), the rotary member (40) having a base end through which fuel is fed to the rotary member (40); a tube (20) removably attached to one end of the rotary member (40), the end of the rotary member (40) being adjacent to the blast furnace, the tube (20) having a leading end through which it is to be fed the fuel fed into the blast furnace; and a retainer (60) removably attached to the cylinder (30), holding the retainer (60) to the rotating member (40) in the cylinder (30), wherein the cylinder (30) has an inner periphery having a first sealing face (34), the rotating member (40) has a second sealing face (44), and the second sealing face (44) comes into sealing contact with the first sealing face (34) when the member The rotary (40) is housed in the cylinder (30), characterized in that the tube (20) has a base end portion that has a second engagement portion (22), and the rotary member (40) has a second engaged portion (42) which is applied to the second application portion (22).

Description

DESCRIPTION

Fuel feeding device

Technical field

The present invention relates to a fuel feeding apparatus, such as a burner, for injecting fuel, such as pulverized coal, from the blast furnace nozzles into the furnace.

Prior art

To reduce the amount of coke to use, fuel, such as pulverized coal or heavy oil, is injected from the blast furnace nozzles to cause combustion in the furnace. The fuel, such as pulverized coal, is injected together with a jet of hot air into the furnace through a PC burner (in the present specification and in the following, it will also be called simply "burner") which is ex tends through a blower tube attached to each nozzle.

A traditional burner is made, for example, of a stainless steel material or any other special metallic material that has a high thermal resistance because the burner is exposed to a high temperature. Unfortunately, a traditional burner of this type still causes problems, such as thermal deformation of a lance tube, which, for example, can damage the nozzle or reduce combustion efficiency. To avoid these problems, the traditional burner requires replacement of the damaged lance tube with a new one after each deformation, resulting in increased consumption of lance tubes. In addition, burner replacement should be performed with jet reduction during suspension of blast furnace operation. These requirements lead to an increase in cost.

To address these problems, a burner described in JP 5105293 (PLT 1) includes a lance tube that can be deformed and can be rotated around the shaft slightly reducing the spring force. The burner lance tube can be properly rotated at the start of thermal deformation under a watertight condition, so that the deformed portion of the lance tube is moved to a different position. Such rotation can prevent further deformation of the deformed portion of the lance tube and keep the lance tube in a substantially linear fashion for a long time, and therefore can efficiently prevent damage to the nozzle and a decrease in combustion efficiency.

Another burner is disclosed in WO 2014/076847 A1, which describes a purpose for a PC burner having a lance tube provided such that the tip portion thereof approaches the interior of a furnace from a nozzle of a blast furnace, to suppress the deformation of the tube throws by high temperatures and to maintain an economic and effective combustion. A connection part that supports the lance tube is provided with: a hollow sleeve; a flange member having a through hole in a central part and threaded in an end part on the front side of the sleeve; an adapter having a through hole in a central part, is inserted into the sleeve from an opening in the rear side of the sleeve, and to which the tube is attached launches at a front end part; and a spring that firmly presses the adapter against a portion of the rear end of the flange member. The lance tube is rotatable about an axis by loosening a screw in an adapter member.

Summary of the invention

General blast furnace maintenance requires suspending the air stream for approximately 12 to 72 hours once every one to two months. The blast furnace production setting also requires air jet suspension. During the suspension of the air jet in the blast furnace, the supply of hot air jets and high temperature fuel, such as pulverized coal, into the furnace is also suspended, and production is also suspended. In addition, burner maintenance is carried out during the suspension of the air jet in the furnace. In detail, the burner is separated from the furnace blow tube, and then the lance tube is separated from the burner flange. Unfortunately, the burner lance tube described in PTL 1, which is integrated with an adapter and a sleeve, separates along with the adapter from the flange. This separation causes exposure of the sealing faces between the flange and the adapter (in detail, the inclined face along the entire outer periphery of the front end of the adapter and the inclined face along the inner periphery of the rear end. of the flange screw cylinder). Such exposed sealing faces are susceptible to deposition of dust and scratches that can cause gas and dust particles to leak from a space between the sealing faces during operation of the blast furnace. These problems compel plant workers to pay sensitive attention to burner maintenance, resulting in a high workload for plant workers.

An object of the present invention, which has been made in view of these problems, is to provide a fuel feed apparatus that can maintain a pipeline in a substantially linear fashion for a long period of time to efficiently prevent damage to the nozzle and decreased blast furnace combustion efficiency. The fuel supply apparatus tube according to the present invention can be replaced by a new one without exposing the sealing faces between a cylinder attached to the mounting portion, such as a flange, of the furnace wind tube and a rotating member housed in the cylinder, to a load of reduced work for plant workers.

The fuel feeding apparatus according to the present invention comprises a cylinder that can be attached to a wind tube mounting portion of a blast furnace; a hollow rotating member rotatably housed in the cylinder, the rotating member having a base end through which fuel is fed to the rotating member; a tube removably attached to one end of the rotating member, the end of the rotating member being adjacent to the blast furnace, the tube having a leading end through which fuel is fed into the blast furnace; and a retainer removably attached to the cylinder, attaching the retainer to the rotating member in the cylinder, wherein the cylinder has an inner periphery having a first sealing face, the rotating member having a second sealing face, and entering sealing contact the second sealing face with the first sealing face when the rotating member is housed in the cylinder. In the fuel feeding apparatus having such a configuration, the tube is removably attached to the end (adjacent to the blast furnace) of the rotating member which is rotatably housed in the cylinder. At the beginning of the thermal deformation of the tube, the tube can be rotated appropriately under a tanca condition, so that the deformed portion moves to a different position. In this way, the tube can retain a substantially linear shape over the long term, which can efficiently prevent damage to the blast furnace nozzle and a decrease in combustion efficiency. In addition, only the tube can be replaced with a new one without exposing the sealing faces between the cylinder attached to the mounting portion, such as a flange, of the blast furnace wind tube and the rotating member, with reduced workload for the aforementioned workers.

The fuel to be fed into the rotating element of the fuel feeding apparatus according to the present invention can be pulverized coal, waste plastic, hydrogen gas or heavy oil.

The fuel supply apparatus according to the present invention may further comprise a push member which forces the second sealing face of the rotating member towards the first sealing face of the cylinder.

The push member may comprise a spring, and the second sealing face of the rotating member may be forced toward the first sealing face of the cylinder by an elastic force of the spring from a compressed state.

In the fuel feeding apparatus according to the present invention, the cylinder can have a first applied portion on the inner periphery, and the retainer can have a first applied portion that is removably applied with the first applied portion.

In the fuel feeding apparatus according to the present invention, the tube may have a base end portion having a second engagement portion, and the rotary member may have a second engagement portion which is applied to the second portion of application.

The fuel feeding apparatus according to the present invention may further include an operating portion attached to the rotating member, the operating portion being configured to rotate the rotating member. The fuel feeding apparatus according to the present invention may further include a locking mechanism that secures the retainer which is applied with the cylinder to the cylinder.

Brief description of the drawings

Fig. 1 is a schematic view of a blast furnace configuration to which fuel, such as pulverized coal, is to be supplied from a fuel feed apparatus according to an embodiment of the present invention.

Fig. 2 is a side view of the fuel supply apparatus according to the embodiment of the present invention.

Figure 3 is an enlarged longitudinal cross section of the internal configuration of the fuel supply apparatus illustrated in Figure 2.

Figure 4 is an exploded view of the components of the fuel supply apparatus illustrated in Figure 2.

Figure 5 is a perspective view of a cylinder of the fuel supply apparatus illustrated in Figure 2 before a retainer has been attached to the cylinder.

Figure 6 is a perspective view of a cylinder of the fuel supply apparatus illustrated in Figure 2 after a retainer has been attached to the cylinder.

Fig. 7 is a longitudinal cross-sectional view of the fuel feed apparatus illustrated in Fig. 2 including a deformed pipe at the front end in the blast furnace nozzle.

Description of realizations

Embodiments of the present invention will now be described with reference to the accompanying drawings. Figures 1 to 7 illustrate a fuel feed apparatus in accordance with an embodiment of the present invention and a blast furnace to be fed with fuel, such as pulverized coal, from the fuel feed apparatus. Fig. 1 is a schematic view of the configuration of the blast furnace to which fuel, such as pulverized coal, is to be supplied from the fuel feed apparatus according to the embodiment, and Fig. 2 is a side view of the fuel feed apparatus. fuel according to the embodiment. Figure 3 is an enlarged longitudinal cross-sectional view of the internal configuration of the fuel supply apparatus illustrated in Figure 2, and Figure 4 is an exploded view of the components of the fuel supply apparatus which illustrated in Figure 2. Figure 5 is a perspective view of a cylinder of the fuel supply apparatus illustrated in Figure 2 before a retainer is attached to the cylinder, and Figure 6 is a perspective view of a cylinder of the fuel feeding apparatus illustrated in Figure 2 after a retainer is attached to the cylinder. Fig. 7 is a longitudinal cross-sectional view of the fuel feeding apparatus in Fig. 2 illustrating a deformed pipe at the front end in the blast furnace nozzle.

The configuration of the blast furnace 1, which is to be fueled, such as pulverized coal from the fuel feed apparatus 10 according to the embodiment, is described below with reference to Figure 1. Blast furnace 1 is a structure vertical cylindrical having an outer face covered with a steel plate and an inner face lined with a refractory material. The blast furnace 1 includes about 20 to 50 nozzles 2 that extend radially from the side face of the blast furnace 1. The hot jets of air pass through the hot air stoves 3 and a wind tube 4 are blown through the nozzles 2 in the blast furnace 1. The nozzles 2 are made of copper and are water-cooled. An extraction port for discharging cast iron and a slag port for discharging molten slag are separately arranged below the nozzles 2. The fuel supply apparatus (PC burner) 10 according to the embodiment is configured to inject fuel, such as pulverized coal, in the blast furnace 1 through the nozzles 2. In detail, each nozzle 2 of the blast furnace 1 has a blower tube, and a tube 20 (described below) of the fuel feed apparatus 10 is configured to be arranged in the blower tube such that the forward end portion of tube 20 extends from nozzle 2 into the oven.

The configuration of the fuel supply apparatus (PC burner) 10 according to the embodiment will now be described with reference to Figures 2 to 6. The fuel supply apparatus 10 according to the embodiment includes a cylinder (sleeve) 30 which can be attached to a mounting portion, such as a flange, (not shown) of the wind tube 4 of the furnace 1, a hollow rotary member (adapter) rotatably arranged in the cylinder 30 and having one end base through which the fuel is fed into the internal space of the rotating member 40, a tube (lance tube) 20 removably attached to the end (adjacent to the blast furnace 1) of the rotating member 40 and having a leading end to through which fuel is fed to blast furnace 1, and a retainer 60 removably attached to cylinder 30 and supporting rotary member 40 in cylinder 30. A spring 50 is disposed in cylinder 30 and functions as a m thrust member to force a second sealing face 44 (described below) of the rotating member 40 to a first sealing face 34 (described below) of the cylinder 30. An operative portion 70 to rotate the rotating member 40 is attached, for example, by welding, to the rotating member 40. These components of the fuel supply apparatus 10 are described in detail below.

The tube (lance tube) 20 is a long, thin tube made of a heat resistant material, such as stainless steel. The base end portion (attached to rotating member 40) of tube 20 has an external thread 22 (second engagement portion) such as a thread crest on the outer periphery (see Figure 3). The end end portion (adjacent to the blast furnace 1) of the hollow rotary member 40 (described below) has an internal thread 42 (second engagement portion) such as a threaded hole in the inner periphery. The external thread 22 of tube 20 is screwed into the internal thread 42 of rotating member 40. Thus, tube 20 is removably attached to the end, adjacent to blast furnace 1, of rotating member 40. Fixing of tube 20 The rotatable member 40 brings into communication the inner space of tube 20 with the inner space of rotating member 40.

Several projections 32, for example three, extend radially from the outer periphery of the cylinder or sleeve 30 at substantially one end, adjacent to blast furnace 1, of the cylinder. Projections 32 facilitate attachment of cylinder 30 to the mounting portion, such as a flange, (not shown) of blast furnace 4 wind tube 4. Projections 32 of cylinder 30 are inserted into holes in the assembly and then rotated to fixing cylinder 30 to wind tube 4 of blast furnace 1. At the place of insertion and rotation of projections 32 in the holes of the mounting portion, cylinder 30 can be fixed to wind tube 4 of blast furnace 1 with keys such as keys. Several fins 38, for example four, extend radially from the outer periphery of cylinder 30. Cylinder 30 has a first sealing face 34 along its entire inner periphery. The first sealing face 34 is progressively narrowed in the longitudinal direction (ie the horizontal direction in Figures 3 and 4) of cylinder 30. Cylinder 30 has two locking holes 39 near its base end (remote blast furnace 1). The retainer 60 that is applied to the cylinder 30 is secured to the cylinder 30 with a locking pin or rod 66 that extends through the locking holes 39 (see Figures 5 and 6).

Referring to Figures 3 and 4, the hollow rotary member (adapter) 40 has a second sealing face 44 along its outer periphery in the middle of the longitudinal direction. By accommodating the rotating member 40 in the cylinder 30, the second sealing face 44 comes into sealing contact with the first sealing face 34. The second sealing face 44 is progressively tapered in the longitudinal direction (ie, the horizontal direction) in Figures 3 and 4) of the rotating member 40. Close contact of the second sealing face 44 of the rotating member 40 accommodated in the cylinder 30 with the first sealing face 34 of the cylinder 30 can prevent the leakage of gases and dust from a space between the cylinder 30 and the rotating member 40 outside the cylinder 30. The base end (remote from the blast furnace 1) of the rotating member 40 is attached, for example by welding, to the operating portion 70 (described in continuation). Rotating member 40 can be rotated in cylinder 30 by operating portion 70.

The retainer 60 is removably attached to the base end (away from the blast furnace 1) of cylinder 30. By attaching retainer 60 to cylinder 30 the rotating member 40 is maintained in cylinder 30. In detail, retainer 60 has a external thread 62 (first application portion) such as a threaded ridge on the outer periphery of the front end portion (adjacent to blast furnace 1), as illustrated in Figures 4 and 5. Cylinder 30 has an internal thread 36 (first applied portion) such as an extraction hole at the inner periphery of the base end portion. The external thread 62 of the retainer 60 is threaded into the internal thread 36 of the cylinder 30. The retainer 60 is removably attached to the base end of cylinder 30. After application of retainer 60 to cylinder 30, the locking pin 66 is inserted through the two locking holes 39, and the retainer 60 is thus secured to the cylinder 30, as illustrated in Figure 6. In the embodiment, the locking holes 39 and the locking pin 66 operate as a locking mechanism to secure the retainer 60 that is applied with cylinder 30, to cylinder 30.

Referring to Figure 3, spring 50 is disposed around rotatable member 40 in cylinder 30. Spring 50 is in contact with retainer 60 at one end. By accommodating rotary member 40 and spring 50 in cylinder 30 and engagement of retainer 60 with base end of cylinder 30, spring 50 is brought into a compressed state. The elastic force of the spring 50 from the compressed state pushes the rotating member 40 to the left in Figure 3. The second sealing face 44 of the rotating member 40 is thus forced to the first sealing face 34 of the cylinder 30, and the first sealing face 34 is in closer contact with the second sealing face 44. In other words, the spring 50 functions as a push member which forces the second sealing face 44 of the rotating member 40 against the first face seal 34 of cylinder 30. Such a spring 50 places the second sealing face 44 in closer contact with the first sealing face 34 and therefore can prevent gas and dust leaks from a space between the first face sealing 34 and the second sealing face 44 with more certainty.

The operating portion 70 is hollow and is attached, for example, by welding, to the base end, away from the blast furnace 1, of the rotating member 40. The internal space of the operating portion 70 is in communication with the internal space of the rotating member 40. Operating portion 70 has an operated portion 72 that has a polygonal (eg, hexagonal) cross section. For example, the operated portion 72 is caught with a chain or large clamps (not shown) to rotate the operating portion 70, so that the tube 20 and the rotating member 40 rotate in the cylinder 30 attached to the mounting portion, such as a flange, from the blast furnace wind tube 4 1. The operating portion 70 can be connected to a fuel feed hose 80 through which fuel, such as pulverized coal, will be fed into the internal space of the operating portion 70. Operating portion 70 may be directly connected to hose 80 or may be connected to hose 80 with a hollow tube. Alternatively, operating portion 70 may be connected to hose 80 with a valve. Operating portion 70 can be directly connected to a flexible hose through which fuel will be fed into the internal space of operating portion 70.

An assembly process of the fuel supply apparatus 10 will now be described with reference to Figures 4 to 6. For simplicity, tube 20 and hose 80 are not shown in Figures 5 and 6.

At the start of assembly of the fuel feed apparatus 10, the rotating member 40 and spring 50 are accommodated in cylinder 30 so that spring 50 is disposed around rotating member 40. Figure 5 illustrates cylinder 30 accommodating rotating member 40 and spring 50. Retainer 60 is then attached to the base end of cylinder 30 to prevent separation of rotating member 40 and spring 50 from the base end to the outside of cylinder 30. In detail, the external thread 36, such as a threaded ridge, of retainer 60 is screws into the internal thread 36, such as an extraction hole, of the cylinder 30. After the application of the retainer 60, the operative portion 70 in connection with the fuel supply hose 80 is fixed, for example, by welding , to the base end of the rotating member 40. Figure 6 illustrates the cylinder 30 with the retainer 60 attached to the base end of the cylinder 30. At the end of the assembly process, the base end of the tube 20 is attached to the front end of the rotating member 40. In detail, the external thread 22 of the tube 20, such as a threaded crest, is screwed into the internal thread 42, such as an extraction hole, of the rotating member 40. The fuel supply apparatus 10 which illustrated in Figures 2 and 3 is assembled by means of the process described above.

The following describes how to use the fuel feed apparatus 10. Prior to the start of fuel feed, such as pulverized coal, into the blast furnace 1 with the fuel feed apparatus 10, the cylinder projections 32 30 are fixed to the mounting portion, such as a flange, of the vent tube 4 of the blast furnace 1 so that the tube 20 of the fuel feed apparatus 10 is inserted into the blow tube of the blast nozzle 2 oven 1 and the front end portion of tube 20 extends from nozzle 2 into the oven. The fuel, such as pulverized coal, is fed through the fuel feed hose 80 into the internal space of the operating portion 70, so that the fuel passes through the internal space of the operating portion 70, the internal space of the rotating member 40, and into the inner space of tube 20, in this order, and is injected through the front end of tube 20 into blast furnace 1.

After long-term use of tube 20 of fuel supply apparatus 10, tube 20 may thermally form, as illustrated in Figure 7, causing a risk of contact with nozzle 2 or any other component. To avoid risk, in this embodiment, tube 20 and rotating member 40 can be rotated by operating portion 70 at the start of thermal deformation of tube 20, hence the position of the leading end portion of tube 20. that is exposed to heat can be changed. Such proper rotation of tube 20 allows uniform thermal application across the periphery of tube 20, preventing deformation, such as bending in one direction, of tube 20 under its own weight in a high temperature environment.

Next, a process for maintaining the fuel feed apparatus 10 will be described. The fuel feed apparatus 10 according to the embodiment requires occasional replacement of the tube 20 because the tube 20, in particular the front end portion of the tube 20, is prone to thermal damage in blast furnace 1. Since tube 20 is detachable from rotating member 40, replacement of tube 20 does not imply detachment of retainer 60 from cylinder 30. Only tube 20 can be removed while the Rotating member 40 resides in cylinder 30. In other words, tube 20 can be replaced with a new one, while the first sealing face 34 of cylinder 30 is in close contact with the second sealing face 44 of rotating member 40. This configuration can prevent the deposition of dust on the first sealing face 34 and the second sealing face 44 and scratches on the first sealing face 34 and the second sealing face 44.

The rotatable member 40 of the fuel supply apparatus 10 according to the embodiment is worn and needs to be replaced with a new one once a year, in general. Since retainer 60 is removable from cylinder 30, replacement of rotating member 40 requires only separation of retainer 60 from cylinder 30. This configuration can eliminate the workload for plant workers in relation to cylinder replacement time. 30.

In the fuel feeding apparatus 10 according to the embodiment having the configuration described above, the hollow rotary member 40 having the base end through which the fuel is fed into the internal space of the system 10 is housed rotatably in cylinder 30, with tube 20 having the leading end through which fuel is to be fed to blast furnace 1, removably attached to the end (adjacent blast furnace 1) of rotating member 40 , and the retainer 60 that holds the rotating member 40 in the cylinder 30 is removably attached to the cylinder 30. At the beginning of the thermal deformation of the tube 20, the tube 20 can be properly rotated under a watertight condition such that the deformed portion moves to a different position. In this way, tube 20 can retain a substantially linear shape over the long term, which can effectively prevent damage to blast furnace nozzle 2 and a decrease in combustion efficiency. Furthermore, the replacement of tube 20, which does not involve exposing the sealing faces (in particular, the first sealing face 34 and the second sealing face 44) between the cylinder 30 fixed to the mounting portion, such as a flange, from the wind tube 4 of the blast furnace 1 and the rotating member 40, can be achieved with a reduced workload for the above workers. In other words, the retainer 60 functions as a protective cover for the first sealing face 34 and the second sealing face 44.

In the fuel feeding apparatus 10 according to the embodiment, the fuel to be fed into the internal space of the rotating member 40 is pulverized coal, as described above. Powdered coal is a mere non-limiting example of the fuel that will be fed into the inner space of the rotating member 40, and any other fuel, such as waste plastic, hydrogen gas, or heavy oil, can be fed into the inner space of the rotating member 40 .

In the fuel feeding apparatus 10 according to the embodiment, the spring 50 functions as a push member which forces the second sealing face 44 of the rotating member 40 towards the first sealing face 34 of the cylinder 30, as described higher. In detail, the resilience force of spring 50 from a compressed state forces the second sealing face 44 of the rotating member 40 against the first sealing face 34 of the cylinder 30. Since the first sealing face 34 comes into closer contact with the second sealing face 44, leakage of gases and dust from a space between the first sealing face 34 and the second sealing face 44 can be more certainly prevented. The second sealing face 44 of the rotating member 40 can be pushed to the first sealing face 34 of the cylinder 30 with any member other than the spring 50, in the fuel supply apparatus 10 according to the embodiment. Any type of push member (eg, an elastic member such as a flat spring) can be used which can force the second sealing face 44 of the rotating member 40 to the first sealing face 34 of the cylinder 30.

In the fuel feeding apparatus 10 according to the embodiment, the cylinder 30 has the internal thread 36 as the first applied portion on the inner periphery, and the retainer 60 has the external thread 62 as the first applied portion to be applied. can apply to internal thread 36, as described above. The first applied portion and the first applied portion may have any structure other than the internal thread 36 and external thread 62, respectively, in the fuel supply apparatus 10 according to the embodiment. Any other structure that can attach retainer 60 to cylinder 30 can be used as the first applied portion and the first applied portion.

In the fuel feed apparatus 10 according to the embodiment, tube 20 has external thread 22 as the second engagement portion at the base end portion, and rotating member 40 has internal thread 42 as the second engagement portion. which is applicable to the external thread 22, as described above. The second application portion and the second applied portion may be different from the external thread 22 and the internal thread 42, respectively, in the fuel supply apparatus 10 according to the embodiment. Any other structure that can attach tube 20 to rotating member 40 can be used as a second application portion and a second applied portion.

In the fuel feeding apparatus 10 according to the embodiment, the operating portion 70 for rotating the rotating member 40 is attached to the rotating member 40, as described above. Such an operating portion 70 allows the aforementioned workers to easily rotate the rotating member 40 housed in the cylinder 30 attached to the wind tube mounting portion 4 of the blast furnace 1, and thus easily rotate the tube 20.

In the fuel feeding apparatus 10 according to the embodiment, the lock holes 39 and the lock pin 66 function as the lock mechanism to secure the retainer 60 which is applied with the cylinder 30, to the cylinder 30, as it has been described above. Such a locking mechanism can prevent detachment of retainer 60 from cylinder 30 during use of fuel feed apparatus 10.

The embodiment described above should not be construed as limiting the scope of the present invention, and various modifications can be made to the fuel supply apparatus 10.

For example, the spring 50, which is arranged around the rotating member 40 housed in the cylinder 30 in the above description, can be omitted from the fuel supply apparatus 10 in accordance with the embodiment described above. In addition, the rotating member 40 can be rotated by any means other than the operating portion 70.

Claims (8)

1. A fuel supply apparatus (10) comprising: a cylinder (30) applicable to a jet tube mounting portion of a blast furnace; a hollow rotating member (40) rotatably housed in the cylinder (30), the rotating member (40) having a base end through which fuel is fed to the rotating member (40); a tube (20) removably attached to one end of the rotating member (40), the end of the rotating member (40) being adjacent to the blast furnace, the tube (20) having a leading end through which to feeding the fuel fed into the blast furnace; and a retainer (60) removably attached to the cylinder (30), attaching the retainer (60) to the rotatable member (40) in the cylinder (30), wherein the cylinder (30) has an inner periphery having a first sealing face (34), the rotating member (40) has a second sealing face (44), and the second sealing face (44) comes into sealing contact with the first sealing face (34) when the rotating member (40) is housed in the cylinder (30), characterized in that the tube (20) has a base end portion having a second application portion (22), and the rotating member (40) has a second applied portion (42) that is applied to the second application portion (22). 2. The fuel feeding apparatus (10) according to claim 1, wherein the fuel to be fed into the rotating member (40) is pulverized coal, waste plastic, hydrogen gas or heavy oil. The fuel supply apparatus (10) according to claim 1 or 2, further comprising a push member (50) forcing the second sealing face (44) of the rotating member (40) against the first face seal (34) of the cylinder (30). The fuel feeding apparatus (10) according to claim 3, wherein the push member (50) comprises a spring (50), and the second sealing face (44) of the rotating member (40) is forced against the first sealing face (34) of the cylinder (30) by a resilient force of the spring (50) from a compressed state. The fuel feeding apparatus (10) according to any one of claims 1 to 4, wherein the cylinder (30) has a first applied portion (36) on the inner periphery, and the retainer (60) has a first application portion (62) removably applied to the first applied portion (36). 6. The fuel feeding apparatus (10) according to any one of claims 1 to 5, wherein the second application portion (22) of the tube (20) is an external thread (22), and the second application portion (42) of the rotating member (40) is an internal thread (42) within which the thread External (22) of the tube (20) is screwed so that the tube (20) is removably attached to the end of the rotating member (40). The fuel feeding apparatus (10) according to any one of claims 1 to 6, wherein an operating portion (70) for rotating the rotary member (40) is attached to the rotatable member (40). The fuel feeding apparatus (10) according to any one of claims 1 to 7, wherein a locking mechanism (66) is provided to secure the cylinder (30) and the retainer (60) in a it is applied.