EP3214187A1 - Fuel supply device - Google Patents
Fuel supply device Download PDFInfo
- Publication number
- EP3214187A1 EP3214187A1 EP15897894.0A EP15897894A EP3214187A1 EP 3214187 A1 EP3214187 A1 EP 3214187A1 EP 15897894 A EP15897894 A EP 15897894A EP 3214187 A1 EP3214187 A1 EP 3214187A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- rotary member
- fuel supply
- supply apparatus
- sealing face
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 98
- 238000007789 sealing Methods 0.000 claims description 67
- 239000003245 coal Substances 0.000 claims description 15
- 230000007246 mechanism Effects 0.000 claims description 5
- 239000000295 fuel oil Substances 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 239000002699 waste material Substances 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000005422 blasting Methods 0.000 description 5
- 239000000725 suspension Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 230000007774 longterm Effects 0.000 description 4
- 238000012423 maintenance Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010742 number 1 fuel oil Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/18—Charging particulate material using a fluid carrier
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/16—Tuyéres
- C21B7/163—Blowpipe assembly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/02—Structural details of mounting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K3/00—Feeding or distributing of lump or pulverulent fuel to combustion apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/16—Arrangements of tuyeres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0003—Heating elements or systems with particulate fuel, e.g. aspects relating to the feeding
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0005—Injecting liquid fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
- F23D2900/00016—Preventing or reducing deposit build-up on burner parts, e.g. from carbon
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/16—Introducing a fluid jet or current into the charge
- F27D2003/162—Introducing a fluid jet or current into the charge the fluid being an oxidant or a fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D99/00—Subject matter not provided for in other groups of this subclass
- F27D99/0001—Heating elements or systems
- F27D99/0033—Heating elements or systems using burners
- F27D2099/0053—Burner fed with preheated gases
- F27D2099/0055—Fuel
Definitions
- the present invention relates to a fuel supply apparatus, such as a burner, for injecting fuel, such as pulverized coal, from the tuyeres of a blast furnace to the interior of the furnace.
- a fuel supply apparatus such as a burner
- fuel such as pulverized coal
- fuel such as pulverized coal or heavy oil
- the fuel is injected together with a hot blast of air into the furnace through a PC burner (hereinafter, also simply referred to as "burner") extending through a blow tube fixed to each tuyere.
- a PC burner hereinafter, also simply referred to as "burner"
- a traditional burner is made of, for example, a stainless steel material or any other special metal material that has high thermal resistance because the burner is exposed to a high temperature.
- a traditional burner still causes troubles, such as thermal deformation of a lance pipe, which may damage the tuyere or reduce the combustion efficiency, for example.
- the traditional burner requires replacement of the damaged lance pipe with new one after every deformation, resulting in an increase in consumption of lance pipes.
- replacement of the burner should be performed with reducing of blasting during the suspension of the operation of the blast furnace. This requirements lead to an increase in cost.
- a burner disclosed in JP 5105293 includes a lance pipe which is likely to be deformed that can be rotated around the axis by slightly reducing spring force.
- the lance pipe of the burner can be appropriately rotated at the beginning of the thermal deformation under an airtight condition so that the deformed portion of the lance pipe is moved to a different position.
- Such a rotation can prevent further deformation of the deformed portion of the lance pipe and keep the lance pipe in a substantially linear shape for a long time, and thus can efficiently prevent damage to the tuyere and a decrease in combustion efficiency.
- This detachment causes exposure of sealing faces between the flange and the adaptor (in detail, the inclined face along the entire outer periphery of the front end of the adaptor and the inclined face along the inner periphery of the rear end of the screw cylinder of the flange).
- Such exposed sealing faces are susceptible to deposition of dust and scratches thereon that may cause leakage of gases and dust particles from a gap between the sealing faces during the operation of the blast furnace.
- An object of the present invention which has been made in view of these problems, is to provide a fuel supply apparatus that can keep a pipe in a substantially linear shape for a long term to efficiently prevent damage to the tuyere and a decrease in combustion efficiency of the blast furnace.
- the pipe of the fuel supply apparatus according to the present invention can be replaced with new one without exposure of sealing faces between a cylinder fixed to the mounting portion, such as a flange, of the blast tube of the furnace and a rotary member accommodated in the cylinder, at a reduced workload for the site workers.
- the fuel supply apparatus comprises a cylinder attachable to a mounting portion of a blast tube of a blast furnace; a hollow rotary member rotatably accommodated in the cylinder, the rotary member having a base end through which fuel is to be fed into the rotary member; a pipe detachably fixed to an end of the rotary member, the end of the rotary member being adjacent to the blast furnace, the pipe having a front end through which the fuel is to be fed into the blast furnace; and a retainer detachably fixed to the cylinder, the retainer holding the rotary member in the cylinder, wherein the cylinder has an inner periphery having a first sealing face, the rotary member has a second sealing face, and the second sealing face comes into sealing contact with the first sealing face when the rotary member is accommodated in the cylinder.
- the pipe is detachably fixed to the end (adjacent to the blast furnace) of the rotary member that is rotatably accommodated in the cylinder.
- the pipe can be appropriately rotated under an airtight condition, so that the deformed portion is moved to a different position.
- the pipe thereby can retain a substantially linear shape for a long term, which can efficiently prevent damage to the tuyere of the blast furnace and a decrease in combustion efficiency.
- only the pipe can be replaced with new one without exposure of sealing faces between the cylinder fixed to the mounting portion, such as a flange, of the blast tube of the blast furnace and the rotary member, at a reduced workload for the cite workers.
- Fuel to be fed in the rotary member of the fuel supply apparatus according the present invention may be pulverized coal, waste plastic, hydrogen gas or heavy oil.
- the fuel supply apparatus may further comprise an urging member biasing the second sealing face of the rotary member to the first sealing face of the cylinder.
- the urging member may comprise a spring, and the second sealing face of the rotary member may be biased to the first sealing face of the cylinder by a resilient force of the spring from a compressed state.
- the cylinder may have a first engaged portion on the inner periphery, and the retainer may have a first engaging portion detachably engaged with the first engaged portion.
- the pipe may have a base end portion having a second engaging portion, and the rotary member may have a second engaged portion engaged with the second engaging portion.
- the fuel supply apparatus may further include an operating portion fixed to the rotary member, the operating portion being configured to rotate the rotary member.
- the fuel supply apparatus may further include a locking mechanism that secures the retainer engaging with the cylinder to the cylinder.
- Figs. 1 to 7 illustrate a fuel supply apparatus according to an embodiment of the present invention and a blast furnace which is to be supplied with fuel, such as pulverized coal, from the fuel supply apparatus.
- Fig. 1 is a schematic configurational view of the blast furnace which is to be supplied with fuel, such as pulverized coal, from the fuel supply apparatus according to the embodiment
- Fig. 2 is a side view of the fuel supply apparatus according to the embodiment.
- Fig. 3 is an enlarged longitudinal cross-sectional view of the internal configuration of the fuel supply apparatus illustrated in Fig. 2
- Fig. 4 is an exploded view of the components of the fuel supply apparatus illustrated in Fig. 2 .
- Fig. 1 is a schematic configurational view of the blast furnace which is to be supplied with fuel, such as pulverized coal, from the fuel supply apparatus according to the embodiment
- Fig. 2 is a side view of the fuel supply apparatus according to the embodiment.
- Fig. 3 is an enlarged longitudinal cross-sectional view of the internal configuration of the
- Fig. 5 is a perspective view of a cylinder of the fuel supply apparatus illustrated in Fig. 2 before a retainer is not fixed to the cylinder
- Fig. 6 is a perspective view of a cylinder of the fuel supply apparatus illustrated in Fig. 2 after a retainer is fixed to the cylinder
- Fig. 7 is a longitudinal cross-sectional view of the fuel supply apparatus in Fig. 2 illustrating a pipe deformed at the front end in the tuyere of the blast furnace.
- the configuration of the blast furnace 1, which is to be supplied with fuel, such as, pulverized coal from the fuel supply apparatus 10 according to the embodiment, is now described with reference to Fig. 1 .
- the blast furnace 1 is a vertical cylindrical structure having an outer face covered with a steel plate and an inner face lined with a refractory.
- the blast furnace 1 includes about 20 to 50 tuyeres 2 radially extending from the side face of the hearth of the blast furnace 1. Hot blasts of air passing through hot air-blast stoves 3 and a blast tube 4 are blown through the tuyeres 2 into the blast furnace 1.
- the tuyeres 2 are made of copper, and are water-cooled.
- a tap port for discharging molten iron and a slag port for discharging molten slag are separately disposed below the tuyeres 2.
- the fuel supply apparatus (PC burner) 10 according to the embodiment is configured to inject fuel, such as pulverized coal, into the blast furnace 1 through the tuyeres 2.
- each tuyere 2 of the blast furnace 1 has a blow tube, and a pipe 20 (described below) of the fuel supply apparatus 10 is configured to be disposed in the blow tube such that the front end portion of the pipe 20 extends from the tuyere 2 to the interior of the furnace.
- the fuel supply apparatus 10 includes a cylinder (sleeve) 30 attachable to a mounting portion, such as a flange, (not shown) of the blast tube 4 of the blast furnace 1, a hollow rotary member (adaptor) 40 rotatably disposed in the cylinder 30 and having a base end through which fuel is to be fed in the internal space of the rotary member 40, a pipe (lance pipe) 20 detachably fixed to the end (adjacent to the blast furnace 1) of the rotary member 40 and having a front end through which fuel is to be fed into the blast furnace 1, and a retainer 60 detachably fixed to the cylinder 30 and holding the rotary member 40 in the cylinder 30.
- a cylinder (sleeve) 30 attachable to a mounting portion, such as a flange, (not shown) of the blast tube 4 of the blast furnace 1
- a hollow rotary member (adaptor) 40 rotatably disposed in the cylinder 30 and having a base end through which fuel is to be fed in
- a spring 50 is disposed in the cylinder 30 and functions as an urging member for biasing a second sealing face 44 (described below) of the rotary member 40 to a first sealing face 34 (described below) of the cylinder 30.
- An operating portion 70 for rotating the rotary member 40 is fixed, for example, by welding, to the rotary member 40.
- the pipe (lance pipe) 20 is a long thin pipe made of a heat-resistant material, such as stainless steel.
- the base end portion (fixed to the rotary member 40) of the pipe 20 has an external thread 22 (second engaging portion) such as a thread ridge on the outer periphery (refer to Fig. 3 ).
- the front end portion (adjacent to the blast furnace 1) of the hollow rotary member 40 (described below) has an internal thread 42 (second engaged portion) such as a tapped hole on the inner periphery.
- the external thread 22 of the pipe 20 is screwed into the internal thread 42 of the rotary member 40.
- the pipe 20 is thus detachably fixed to the end, adjacent to the blast furnace 1, of the rotary member 40. Fixing the pipe 20 to the rotary member 40 brings the internal space of the pipe 20 into communication with the internal space of the rotary member 40.
- three projections 32 radially extend from the outer periphery of the cylinder or sleeve 30 substantially at an end, adjacent to the blast furnace 1, of the cylinder.
- the projections 32 facilitate fixation of the cylinder 30 to the mounting portion, such as a flange, (not shown) of the blast tube 4 of the blast furnace 1.
- the projections 32 of the cylinder 30 are inserted in the holes in the mounting portion and then rotated to fix the cylinder 30 to the blast tube 4 of the blast furnace 1.
- the cylinder 30 may be fixed to the blast tube 4 of the blast furnace 1 with keys, such as cotters.
- the cylinder 30 has a first sealing face 34 along its entire inner periphery.
- the first sealing face 34 is tapered in the longitudinal direction (i.e., the horizontal direction in Figs. 3 and 4 ) of the cylinder 30.
- the cylinder 30 has two locking holes 39 near its base end (remote from the blast furnace 1).
- the retainer 60 engaging with the cylinder 30 is secured to the cylinder 30 with a locking pin or rod 66 extending through the locking holes 39 (refer to Figs. 5 and 6 ).
- the hollow rotary member (adaptor) 40 has a second sealing face 44 along its outer periphery in the middle of the longitudinal direction. Accommodating the rotary member 40 in the cylinder 30 brings the second sealing face 44 into sealing contact with the first sealing face 34.
- the second sealing face 44 is tapered in the longitudinal direction (i.e., the horizontal direction in Figs. 3 and 4 ) of the rotary member 40.
- the close contact of the second sealing face 44 of the rotary member 40 accommodated in the cylinder 30 with the first sealing face 34 of the cylinder 30 can prevent leakage of gases and dusts from a gap between the cylinder 30 and the rotary member 40 to the exterior of the cylinder 30.
- the base end (remote from the blast furnace 1) of the rotary member 40 is fixed, for example, by welding, to the operating portion 70 (described below). The rotary member 40 can be rotated in the cylinder 30 by the operating portion 70.
- the retainer 60 is detachably fixed to the base end (remote from the blast furnace 1) of the cylinder 30. Fixing the retainer 60 to the cylinder 30 holds the rotary member 40 in the cylinder 30.
- the retainer 60 has an external thread 62 (first engaging portion) such as a thread ridge on the outer periphery of the front end portion (adjacent to the blast furnace 1), as illustrated in Figs. 4 and 5 .
- the cylinder 30 has an internal thread 36 (first engaged portion) such as a tapped hole on the inner periphery of the base end portion.
- the external thread 62 of the retainer 60 is screwed into the internal thread 36 of the cylinder 30.
- the retainer 60 is thus detachably fixed to the base end of the cylinder 30.
- the locking pin 66 is inserted through the two locking holes 39, and the retainer 60 is thereby secured to the cylinder 30, as illustrated in Fig. 6 .
- the locking holes 39 and the locking pin 66 function as a locking mechanism for securing the retainer 60 engaging with the cylinder 30 to the cylinder 30.
- the spring 50 is disposed around the rotary member 40 in the cylinder 30.
- the spring 50 is in contact with the retainer 60 at one end. Accommodating the rotary member 40 and the spring 50 in the cylinder 30 and engaging the retainer 60 with the base end of the cylinder 30 bring the spring 50 into a compressed state.
- the resilient force of the spring 50 from the compressed state urges the rotary member 40 to the left in Fig. 3 .
- the second sealing face 44 of the rotary member 40 is thereby biased 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.
- the spring 50 functions as an urging member biasing the second sealing face 44 of the rotary member 40 to the first sealing face 34 of the cylinder 30.
- Such a spring 50 brings the second sealing face 44 into closer contact with the first sealing face 34 and thus can prevent leakage of gases and dusts from a gap between the first sealing face 34 and the second sealing face 44 with more certainty.
- the operating portion 70 is hollow and is fixed, for example, by welding, to the base end, remote from the blast furnace 1, of the rotary member 40.
- the internal space of the operating portion 70 is in communication with the internal space of the rotary member 40.
- the operating portion 70 has an operated portion 72 having a polygonal (for example, hexagonal) cross-section.
- the operated portion 72 is caught with a chain or large pliers (not shown) to rotate the operating portion 70, so that the pipe 20 and the rotary member 40 are rotated in the cylinder 30 fixed to the mounting portion, such as a flange, of the blast tube 4 of the blast furnace 1.
- the operating portion 70 is connectable to a fuel supply hose 80 through which fuel, such as pulverized coal, is to be fed in the internal space of the operating portion 70.
- the operating portion 70 may be directly connected to the hose 80 or may be connected to the hose 80 with a hollow tube. Alternatively, the operating portion 70 may be connected to the hose 80 with a valve.
- the operating portion 70 may be directly connected to a flexible hose through which fuel is to be fed in the internal space of the operating portion 70.
- rotary member 40 and the spring 50 are accommodated in the cylinder 30 such that the spring 50 is disposed around the rotary member 40.
- Fig. 5 illustrates the cylinder 30 accommodating the rotary member 40 and the spring 50.
- the retainer 60 is then fixed to the base end of the cylinder 30 to prevent detachment of the rotary member 40 and the spring 50 from the base end to the exterior of the cylinder 30.
- the external thread 36, such as a thread ridge, of the retainer 60 is screwed into the internal thread 36,such as a tapped hole, of the cylinder 30.
- Fig. 6 illustrates the cylinder 30 with the retainer 60 fixed to the base end of the cylinder 30.
- the base end of the pipe 20 is fixed to the front end of the rotary member 40.
- the external thread 22, such as a thread ridge, of the pipe 20 is screwed into the internal thread 42, such as a tapped hole, of the rotary member 40.
- the fuel supply apparatus 10 illustrated in Figs. 2 and 3 is assembled through the process described above.
- the projections 32 of the cylinder 30 are fixed to the mounting portion, such as a flange, of the blast tube 4 of the blast furnace 1 such that the pipe 20 of the fuel supply apparatus 10 is inserted in the blow tube of the tuyere 2 of the blast furnace 1 and the front end portion of the pipe 20 extends from the tuyere 2 to the interior of the furnace.
- Fuel such as pulverized coal, is fed through the fuel supply hose 80 in 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 rotary member 40, and the internal space of the pipe 20, in this order, and is injected through the front end of the pipe 20 in the blast furnace 1.
- the pipe 20 may be thermally deformed, as illustrated in Fig. 7 , causing a risk of contact with the tuyere 2 or any other component.
- the pipe 20 and the rotary member 40 can be rotated by the operating portion 70 at the beginning of the thermal deformation of the pipe 20, thereby the position of the front end portion of the pipe 20 which is exposed to heat can be changed.
- Such an appropriate rotation of the pipe 20 enables uniform thermal application to the entire periphery of the pipe 20, preventing deformation, such as flexure in one direction, of the pipe 20 under it's own weight in a high temperature environment.
- the fuel supply apparatus 10 requires occasional replacement of the pipe 20 because the pipe 20, in particular, the front end portion of the pipe 20, is prone to be thermally damaged in the blast furnace 1. Since the pipe 20 is detachable from the rotary member 40, the replacement of the pipe 20 does not involve detachment of the retainer 60 from the cylinder 30. Only the pipe 20 can be detached whereas the rotary member 40 resides in the cylinder 30. In other words, the pipe 20 can be replaced with new one whereas the first sealing face 34 of the cylinder 30 is in close contact with the second sealing face 44 of the rotary member 40. This configuration can prevent deposition of dusts onto 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 rotary member 40 of the fuel supply apparatus 10 is worn and needs to be replaced with new one once a year, in general. Since the retainer 60 is detachable from the cylinder 30, the replacement of the rotary member 40 requires detachment of only the retainer 60 from the cylinder 30. This configuration can eliminate workload for the site workers in association with the replacement of the cylinder 30.
- the hollow rotary member 40 having the base end through which fuel is to be fed in the internal space of the system 10 is rotatably accommodated in the cylinder 30, the pipe 20 having the front end through which the fuel is to be fed into the blast furnace 1 is detachably fixed to the end (adjacent to the blast furnace 1) of the rotary member 40, and the retainer 60 holding the rotary member 40 in the cylinder 30 is detachably fixed to the cylinder 30.
- the pipe 20 can be appropriately rotated under an airtight condition such that the deformed portion is moved to a different position.
- the pipe 20 thereby can retain a substantially linear shape for a long term, which can efficiently prevent damage to the tuyere 2 of the blast furnace 1 and a decrease in combustion efficiency.
- the replacement of the pipe 20, which does not involve the exposure of the sealing faces (in specific, the first sealing face 34 and the second sealing face 44) between the cylinder 30 fixed to the mounting portion, such as a flange, of the blast tube 4 of the blast furnace 1 and the rotary member 40, can be achieved at a reduced workload for the cite workers.
- the retainer 60 functions as a protective cover for the first sealing face 34 and the second sealing face 44.
- fuel to be fed into the internal space of the rotary member 40 is pulverized coal, as described above.
- the pulverized coal is a mere non-limiting example of the fuel to be fed into the internal space of the rotary member 40, and any other fuel, such as waste plastic, hydrogen gas, or heavy oil, may be fed into the internal space of the rotary member 40.
- the spring 50 functions as an urging member biasing the second sealing face 44 of the rotary member 40 to the first sealing face 34 of the cylinder 30, as described above.
- the resilient force of the spring 50 from a compressed state biases the second sealing face 44 of the rotary member 40 to 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 gap between the first sealing face 34 and the second sealing face 44 can be prevented with more certainty.
- the second sealing face 44 of the rotary member 40 may be urged 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 urging member (an elastic member, such as a flat spring, for example) may be used that can bias the second sealing face 44 of the rotary member 40 to the first sealing face 34 of the cylinder 30.
- the cylinder 30 has the internal thread 36 as the first engaged portion on the inner periphery, and the retainer 60 has the external thread 62 as the first engaging portion that is engageable with the internal thread 36, as described above.
- the first engaged portion and the first engaging portion may have any structure other than the internal thread 36 and the external thread 62, respectively, in the fuel supply apparatus 10 according to the embodiment. Any other structures that can fix the retainer 60 to the cylinder 30 can be used as the first engaging portion and the first engaged portion.
- the pipe 20 has the external thread 22 as the second engaging portion at the base end portion
- the rotary member 40 has the internal thread 42 as the second engaged portion that is engageable with the external thread 22, as described above.
- the second engaging portion and the second engaged portion may be other than the external thread 22 and the internal thread 42, respectively, in the fuel supply apparatus 10 according to the embodiment. Any other structures that can fix the pipe 20 to the rotary member 40 may be used as the second engaging portion and the second engaged portion.
- the operating portion 70 for rotating the rotary member 40 is fixed to the rotary member 40, as described above.
- Such a operating portion 70 enables the cite workers to readily rotate the rotary member 40 accommodated in the cylinder 30 fixed to the mounting portion of the blast tube 4 of the blast furnace 1, and thus to readily rotate the pipe 20.
- the locking holes 39 and the locking pin 66 function as the locking mechanism for securing the retainer 60 engaging with the cylinder 30 to the cylinder 30, as described above.
- Such a locking mechanism can prevent the detachment of the retainer 60 from the cylinder 30 during the use of the fuel supply apparatus 10.
- the spring 50 which is disposed around the rotary member 40 accommodated in the cylinder 30 in the above description, may be omitted from the fuel supply apparatus 10 according to the embodiment described above.
- the rotary member 40 may be rotated with any means other than operating portion 70.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
- Manufacture Of Iron (AREA)
- Furnace Charging Or Discharging (AREA)
Abstract
Description
- The present invention relates to a fuel supply apparatus, such as a burner, for injecting fuel, such as pulverized coal, from the tuyeres of a blast furnace to the interior of the furnace.
- For a reduction in the amount of coke to be used, fuel, such as pulverized coal or heavy oil, is injected from the tuyeres of a blast furnace to cause combustion in the furnace. The fuel, such as pulverized coal, is injected together with a hot blast of air into the furnace through a PC burner (hereinafter, also simply referred to as "burner") extending through a blow tube fixed to each tuyere.
- A traditional burner is made of, for example, a stainless steel material or any other special metal material that has high thermal resistance because the burner is exposed to a high temperature. Unfortunately, such a traditional burner still causes troubles, such as thermal deformation of a lance pipe, which may damage the tuyere or reduce the combustion efficiency, for example. To avoid these troubles, the traditional burner requires replacement of the damaged lance pipe with new one after every deformation, resulting in an increase in consumption of lance pipes. In addition, replacement of the burner should be performed with reducing of blasting during the suspension of the operation of the blast furnace. This requirements lead to an increase in cost.
- To address these problems, a burner disclosed in
JP 5105293 - Overall maintenance of the blast furnace requires suspension of air blasting for about 12 to 72 hours once every one or two months. Production adjustment for the blast furnace also requires the suspension of air blasting. During the suspension of air blasting in the blast furnace, feed of high-temperature hot blasts of air and fuel, such as pulverized coal, to the interior of the furnace is also suspended, and the production is also suspended. Moreover, Maintenance of the burner is conducted during the suspension of air blasting in the furnace. In detail, the burner is detached from the blow tube of the furnace, and then the lance pipe is detached from the flange of the burner. Unfortunately, the lance pipe of the burner disclosed in PTL 1, which is integrated with an adaptor and a sleeve, is detached together with the adaptor from the flange. This detachment causes exposure of sealing faces between the flange and the adaptor (in detail, the inclined face along the entire outer periphery of the front end of the adaptor and the inclined face along the inner periphery of the rear end of the screw cylinder of the flange). Such exposed sealing faces are susceptible to deposition of dust and scratches thereon that may cause leakage of gases and dust particles from a gap between the sealing faces during the operation of the blast furnace. These problems force the site workers to pay sensitive attention to the maintenance of the burner, resulting in heavy workload for the site workers.
- An object of the present invention, which has been made in view of these problems, is to provide a fuel supply apparatus that can keep a pipe in a substantially linear shape for a long term to efficiently prevent damage to the tuyere and a decrease in combustion efficiency of the blast furnace. The pipe of the fuel supply apparatus according to the present invention can be replaced with new one without exposure of sealing faces between a cylinder fixed to the mounting portion, such as a flange, of the blast tube of the furnace and a rotary member accommodated in the cylinder, at a reduced workload for the site workers.
- The fuel supply apparatus according to the present invention comprises a cylinder attachable to a mounting portion of a blast tube of a blast furnace; a hollow rotary member rotatably accommodated in the cylinder, the rotary member having a base end through which fuel is to be fed into the rotary member; a pipe detachably fixed to an end of the rotary member, the end of the rotary member being adjacent to the blast furnace, the pipe having a front end through which the fuel is to be fed into the blast furnace; and a retainer detachably fixed to the cylinder, the retainer holding the rotary member in the cylinder, wherein the cylinder has an inner periphery having a first sealing face, the rotary member has a second sealing face, and the second sealing face comes into sealing contact with the first sealing face when the rotary member is accommodated in the cylinder.
- In the fuel supply apparatus having such a configuration, the pipe is detachably fixed to the end (adjacent to the blast furnace) of the rotary member that is rotatably accommodated in the cylinder. At the beginning of thermal deformation of the pipe, the pipe can be appropriately rotated under an airtight condition, so that the deformed portion is moved to a different position. The pipe thereby can retain a substantially linear shape for a long term, which can efficiently prevent damage to the tuyere of the blast furnace and a decrease in combustion efficiency. In addition, only the pipe can be replaced with new one without exposure of sealing faces between the cylinder fixed to the mounting portion, such as a flange, of the blast tube of the blast furnace and the rotary member, at a reduced workload for the cite workers.
- Fuel to be fed in the rotary member of the fuel supply apparatus according the present invention may be pulverized coal, waste plastic, hydrogen gas or heavy oil.
- The fuel supply apparatus according to the present invention may further comprise an urging member biasing the second sealing face of the rotary member to the first sealing face of the cylinder.
- The urging member may comprise a spring, and the second sealing face of the rotary member may be biased to the first sealing face of the cylinder by a resilient force of the spring from a compressed state.
- In the fuel supply apparatus according to the present invention, the cylinder may have a first engaged portion on the inner periphery, and the retainer may have a first engaging portion detachably engaged with the first engaged portion.
- In the fuel supply apparatus according to the present invention, the pipe may have a base end portion having a second engaging portion, and the rotary member may have a second engaged portion engaged with the second engaging portion.
- The fuel supply apparatus according to the present invention may further include an operating portion fixed to the rotary member, the operating portion being configured to rotate the rotary member.
- The fuel supply apparatus according to the present invention may further include a locking mechanism that secures the retainer engaging with the cylinder to the cylinder.
-
-
Fig. 1 is a schematic configurational view of a blast furnace which is to be supplied with fuel, such as pulverized coal, from a fuel supply 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. -
Fig. 3 is an enlarged longitudinal cross-section of the internal configuration of the fuel supply apparatus illustrated inFig. 2 . -
Fig. 4 is an exploded view of the components of the fuel supply apparatus illustrated inFig. 2 . -
Fig. 5 is a perspective view of a cylinder of the fuel supply apparatus illustrated inFig. 2 before a retainer is not fixed to the cylinder. -
Fig. 6 is a perspective view of a cylinder of the fuel supply apparatus illustrated inFig. 2 after a retainer is fixed to the cylinder. -
Fig. 7 is a longitudinal cross-sectional view of the fuel supply apparatus illustrated inFig. 2 including a pipe deformed at the front end in the tuyere of the blast furnace. - Embodiments of the present invention will now be described with reference to the accompanying drawings.
Figs. 1 to 7 illustrate a fuel supply apparatus according to an embodiment of the present invention and a blast furnace which is to be supplied with fuel, such as pulverized coal, from the fuel supply apparatus.Fig. 1 is a schematic configurational view of the blast furnace which is to be supplied with fuel, such as pulverized coal, from the fuel supply apparatus according to the embodiment, andFig. 2 is a side view of the fuel supply apparatus according to the embodiment.Fig. 3 is an enlarged longitudinal cross-sectional view of the internal configuration of the fuel supply apparatus illustrated inFig. 2 , andFig. 4 is an exploded view of the components of the fuel supply apparatus illustrated inFig. 2 .Fig. 5 is a perspective view of a cylinder of the fuel supply apparatus illustrated inFig. 2 before a retainer is not fixed to the cylinder, andFig. 6 is a perspective view of a cylinder of the fuel supply apparatus illustrated inFig. 2 after a retainer is fixed to the cylinder.Fig. 7 is a longitudinal cross-sectional view of the fuel supply apparatus inFig. 2 illustrating a pipe deformed at the front end in the tuyere of the blast furnace. - The configuration of the blast furnace 1, which is to be supplied with fuel, such as, pulverized coal from the
fuel supply apparatus 10 according to the embodiment, is now described with reference toFig. 1 . The blast furnace 1 is a vertical cylindrical structure having an outer face covered with a steel plate and an inner face lined with a refractory. The blast furnace 1 includes about 20 to 50tuyeres 2 radially extending from the side face of the hearth of the blast furnace 1. Hot blasts of air passing through hot air-blast stoves 3 and ablast tube 4 are blown through thetuyeres 2 into the blast furnace 1. Thetuyeres 2 are made of copper, and are water-cooled. A tap port for discharging molten iron and a slag port for discharging molten slag are separately disposed below thetuyeres 2. The fuel supply apparatus (PC burner) 10 according to the embodiment is configured to inject fuel, such as pulverized coal, into the blast furnace 1 through thetuyeres 2. In detail, eachtuyere 2 of the blast furnace 1 has a blow tube, and a pipe 20 (described below) of thefuel supply apparatus 10 is configured to be disposed in the blow tube such that the front end portion of thepipe 20 extends from thetuyere 2 to the interior of the furnace. - The configuration of the fuel supply apparatus (PC burner) 10 according to the embodiment will now be described with reference to
Figs. 2 to 6 . Thefuel supply apparatus 10 according to the embodiment includes a cylinder (sleeve) 30 attachable to a mounting portion, such as a flange, (not shown) of theblast tube 4 of the blast furnace 1, a hollow rotary member (adaptor) 40 rotatably disposed in thecylinder 30 and having a base end through which fuel is to be fed in the internal space of therotary member 40, a pipe (lance pipe) 20 detachably fixed to the end (adjacent to the blast furnace 1) of therotary member 40 and having a front end through which fuel is to be fed into the blast furnace 1, and aretainer 60 detachably fixed to thecylinder 30 and holding therotary member 40 in thecylinder 30. Aspring 50 is disposed in thecylinder 30 and functions as an urging member for biasing a second sealing face 44 (described below) of therotary member 40 to a first sealing face 34 (described below) of thecylinder 30. Anoperating portion 70 for rotating therotary member 40 is fixed, for example, by welding, to therotary member 40. These components of thefuel supply apparatus 10 are described in detail below. - The pipe (lance pipe) 20 is a long thin pipe made of a heat-resistant material, such as stainless steel. The base end portion (fixed to the rotary member 40) of the
pipe 20 has an external thread 22 (second engaging portion) such as a thread ridge on the outer periphery (refer toFig. 3 ). The front end portion (adjacent to the blast furnace 1) of the hollow rotary member 40 (described below) has an internal thread 42 (second engaged portion) such as a tapped hole on the inner periphery. Theexternal thread 22 of thepipe 20 is screwed into theinternal thread 42 of therotary member 40. Thepipe 20 is thus detachably fixed to the end, adjacent to the blast furnace 1, of therotary member 40. Fixing thepipe 20 to therotary member 40 brings the internal space of thepipe 20 into communication with the internal space of therotary member 40. - Several, for example, three
projections 32 radially extend from the outer periphery of the cylinder orsleeve 30 substantially at an end, adjacent to the blast furnace 1, of the cylinder. Theprojections 32 facilitate fixation of thecylinder 30 to the mounting portion, such as a flange, (not shown) of theblast tube 4 of the blast furnace 1. Theprojections 32 of thecylinder 30 are inserted in the holes in the mounting portion and then rotated to fix thecylinder 30 to theblast tube 4 of the blast furnace 1. In place of the insertion and rotation of theprojections 32 in the holes of the mounting portion, thecylinder 30 may be fixed to theblast tube 4 of the blast furnace 1 with keys, such as cotters. Several, for example, fourfins 38 radially extend from the outer periphery of thecylinder 30. Thecylinder 30 has afirst sealing face 34 along its entire inner periphery. Thefirst sealing face 34 is tapered in the longitudinal direction (i.e., the horizontal direction inFigs. 3 and4 ) of thecylinder 30. Thecylinder 30 has two lockingholes 39 near its base end (remote from the blast furnace 1). Theretainer 60 engaging with thecylinder 30 is secured to thecylinder 30 with a locking pin orrod 66 extending through the locking holes 39 (refer toFigs. 5 and6 ). - With reference to
Figs. 3 and4 , the hollow rotary member (adaptor) 40 has asecond sealing face 44 along its outer periphery in the middle of the longitudinal direction. Accommodating therotary member 40 in thecylinder 30 brings thesecond sealing face 44 into sealing contact with the first sealingface 34. Thesecond sealing face 44 is tapered in the longitudinal direction (i.e., the horizontal direction inFigs. 3 and4 ) of therotary member 40. The close contact of thesecond sealing face 44 of therotary member 40 accommodated in thecylinder 30 with the first sealingface 34 of thecylinder 30 can prevent leakage of gases and dusts from a gap between thecylinder 30 and therotary member 40 to the exterior of thecylinder 30. The base end (remote from the blast furnace 1) of therotary member 40 is fixed, for example, by welding, to the operating portion 70 (described below). Therotary member 40 can be rotated in thecylinder 30 by the operatingportion 70. - The
retainer 60 is detachably fixed to the base end (remote from the blast furnace 1) of thecylinder 30. Fixing theretainer 60 to thecylinder 30 holds therotary member 40 in thecylinder 30. In detail, theretainer 60 has an external thread 62 (first engaging portion) such as a thread ridge on the outer periphery of the front end portion (adjacent to the blast furnace 1), as illustrated inFigs. 4 and 5 . Thecylinder 30 has an internal thread 36 (first engaged portion) such as a tapped hole on the inner periphery of the base end portion. Theexternal thread 62 of theretainer 60 is screwed into theinternal thread 36 of thecylinder 30. Theretainer 60 is thus detachably fixed to the base end of thecylinder 30. After the engagement of theretainer 60 to thecylinder 30, the lockingpin 66 is inserted through the two lockingholes 39, and theretainer 60 is thereby secured to thecylinder 30, as illustrated inFig. 6 . In the embodiment, the locking holes 39 and the lockingpin 66 function as a locking mechanism for securing theretainer 60 engaging with thecylinder 30 to thecylinder 30. - With reference to
Fig. 3 , thespring 50 is disposed around therotary member 40 in thecylinder 30. Thespring 50 is in contact with theretainer 60 at one end. Accommodating therotary member 40 and thespring 50 in thecylinder 30 and engaging theretainer 60 with the base end of thecylinder 30 bring thespring 50 into a compressed state. The resilient force of thespring 50 from the compressed state urges therotary member 40 to the left inFig. 3 . Thesecond sealing face 44 of therotary member 40 is thereby biased to the first sealingface 34 of thecylinder 30, and the first sealingface 34 is in closer contact with thesecond sealing face 44. In other words, thespring 50 functions as an urging member biasing thesecond sealing face 44 of therotary member 40 to the first sealingface 34 of thecylinder 30. Such aspring 50 brings thesecond sealing face 44 into closer contact with the first sealingface 34 and thus can prevent leakage of gases and dusts from a gap between the first sealingface 34 and thesecond sealing face 44 with more certainty. - The operating
portion 70 is hollow and is fixed, for example, by welding, to the base end, remote from the blast furnace 1, of therotary member 40. The internal space of the operatingportion 70 is in communication with the internal space of therotary member 40. The operatingportion 70 has an operatedportion 72 having a polygonal (for example, hexagonal) cross-section. For example, the operatedportion 72 is caught with a chain or large pliers (not shown) to rotate the operatingportion 70, so that thepipe 20 and therotary member 40 are rotated in thecylinder 30 fixed to the mounting portion, such as a flange, of theblast tube 4 of the blast furnace 1. The operatingportion 70 is connectable to afuel supply hose 80 through which fuel, such as pulverized coal, is to be fed in the internal space of the operatingportion 70. The operatingportion 70 may be directly connected to thehose 80 or may be connected to thehose 80 with a hollow tube. Alternatively, the operatingportion 70 may be connected to thehose 80 with a valve. The operatingportion 70 may be directly connected to a flexible hose through which fuel is to be fed in the internal space of the operatingportion 70. - A process of assembling the
fuel supply apparatus 10 will now be described with reference toFigs. 4 to 6 . For simplicity, thepipe 20 and thehose 80 are not depicted inFigs. 5 and6 . - At the start of the assembly of the
fuel supply apparatus 10, therotary member 40 and thespring 50 are accommodated in thecylinder 30 such that thespring 50 is disposed around therotary member 40.Fig. 5 illustrates thecylinder 30 accommodating therotary member 40 and thespring 50. Theretainer 60 is then fixed to the base end of thecylinder 30 to prevent detachment of therotary member 40 and thespring 50 from the base end to the exterior of thecylinder 30. In detail, theexternal thread 36, such as a thread ridge, of theretainer 60 is screwed into theinternal thread 36,such as a tapped hole, of thecylinder 30. After the engagement of theretainer 60, the operatingportion 70 in connection with thefuel supply hose 80 is fixed, for example, by welding, to the base end of therotary member 40.Fig. 6 illustrates thecylinder 30 with theretainer 60 fixed to the base end of thecylinder 30. At the end of the assembling process, the base end of thepipe 20 is fixed to the front end of therotary member 40. In detail, theexternal thread 22, such as a thread ridge, of thepipe 20 is screwed into theinternal thread 42,such as a tapped hole, of therotary member 40. Thefuel supply apparatus 10 illustrated inFigs. 2 and3 is assembled through the process described above. - Now described is how to use the
fuel supply apparatus 10. Before the start of feed of fuel, such as pulverized coal, into the blast furnace 1 with thefuel supply apparatus 10, theprojections 32 of thecylinder 30 are fixed to the mounting portion, such as a flange, of theblast tube 4 of the blast furnace 1 such that thepipe 20 of thefuel supply apparatus 10 is inserted in the blow tube of thetuyere 2 of the blast furnace 1 and the front end portion of thepipe 20 extends from thetuyere 2 to the interior of the furnace. Fuel, such as pulverized coal, is fed through thefuel supply hose 80 in the internal space of the operatingportion 70, so that the fuel passes through the internal space of the operatingportion 70, the internal space of therotary member 40, and the internal space of thepipe 20, in this order, and is injected through the front end of thepipe 20 in the blast furnace 1. - After a long-term use of the
pipe 20 of thefuel supply apparatus 10, thepipe 20 may be thermally deformed, as illustrated inFig. 7 , causing a risk of contact with thetuyere 2 or any other component. To avoid the risk, in this embodiment, thepipe 20 and therotary member 40 can be rotated by the operatingportion 70 at the beginning of the thermal deformation of thepipe 20, thereby the position of the front end portion of thepipe 20 which is exposed to heat can be changed. Such an appropriate rotation of thepipe 20 enables uniform thermal application to the entire periphery of thepipe 20, preventing deformation, such as flexure in one direction, of thepipe 20 under it's own weight in a high temperature environment. - A process will now be described for maintenance of the
fuel supply apparatus 10. Thefuel supply apparatus 10 according to the embodiment requires occasional replacement of thepipe 20 because thepipe 20, in particular, the front end portion of thepipe 20, is prone to be thermally damaged in the blast furnace 1. Since thepipe 20 is detachable from therotary member 40, the replacement of thepipe 20 does not involve detachment of theretainer 60 from thecylinder 30. Only thepipe 20 can be detached whereas therotary member 40 resides in thecylinder 30. In other words, thepipe 20 can be replaced with new one whereas the first sealingface 34 of thecylinder 30 is in close contact with thesecond sealing face 44 of therotary member 40. This configuration can prevent deposition of dusts onto the first sealingface 34 and thesecond sealing face 44 and scratches on the first sealingface 34 and thesecond sealing face 44. - The
rotary member 40 of thefuel supply apparatus 10 according to the embodiment is worn and needs to be replaced with new one once a year, in general. Since theretainer 60 is detachable from thecylinder 30, the replacement of therotary member 40 requires detachment of only theretainer 60 from thecylinder 30. This configuration can eliminate workload for the site workers in association with the replacement of thecylinder 30. - In the
fuel supply apparatus 10 according to the embodiment having the configuration described above, thehollow rotary member 40 having the base end through which fuel is to be fed in the internal space of thesystem 10 is rotatably accommodated in thecylinder 30, thepipe 20 having the front end through which the fuel is to be fed into the blast furnace 1 is detachably fixed to the end (adjacent to the blast furnace 1) of therotary member 40, and theretainer 60 holding therotary member 40 in thecylinder 30 is detachably fixed to thecylinder 30. At the beginning of thermal deformation of thepipe 20, thepipe 20 can be appropriately rotated under an airtight condition such that the deformed portion is moved to a different position. Thepipe 20 thereby can retain a substantially linear shape for a long term, which can efficiently prevent damage to thetuyere 2 of the blast furnace 1 and a decrease in combustion efficiency. In addition, the replacement of thepipe 20, which does not involve the exposure of the sealing faces (in specific, the first sealingface 34 and the second sealing face 44) between thecylinder 30 fixed to the mounting portion, such as a flange, of theblast tube 4 of the blast furnace 1 and therotary member 40, can be achieved at a reduced workload for the cite workers. In other words, theretainer 60 functions as a protective cover for the first sealingface 34 and thesecond sealing face 44. - In the
fuel supply apparatus 10 according to the embodiment, fuel to be fed into the internal space of therotary member 40 is pulverized coal, as described above. The pulverized coal is a mere non-limiting example of the fuel to be fed into the internal space of therotary member 40, and any other fuel, such as waste plastic, hydrogen gas, or heavy oil, may be fed into the internal space of therotary member 40. - In the
fuel supply apparatus 10 according to the embodiment, thespring 50 functions as an urging member biasing thesecond sealing face 44 of therotary member 40 to the first sealingface 34 of thecylinder 30, as described above. In detail, the resilient force of thespring 50 from a compressed state biases thesecond sealing face 44 of therotary member 40 to the first sealingface 34 of thecylinder 30. Since the first sealingface 34 comes into closer contact with thesecond sealing face 44, leakage of gases and dust from a gap between the first sealingface 34 and thesecond sealing face 44 can be prevented with more certainty. Thesecond sealing face 44 of therotary member 40 may be urged to the first sealingface 34 of thecylinder 30 with any member other than thespring 50, in thefuel supply apparatus 10 according to the embodiment. Any type of urging member (an elastic member, such as a flat spring, for example) may be used that can bias thesecond sealing face 44 of therotary member 40 to the first sealingface 34 of thecylinder 30. - In the
fuel supply apparatus 10 according to the embodiment, thecylinder 30 has theinternal thread 36 as the first engaged portion on the inner periphery, and theretainer 60 has theexternal thread 62 as the first engaging portion that is engageable with theinternal thread 36, as described above. The first engaged portion and the first engaging portion may have any structure other than theinternal thread 36 and theexternal thread 62, respectively, in thefuel supply apparatus 10 according to the embodiment. Any other structures that can fix theretainer 60 to thecylinder 30 can be used as the first engaging portion and the first engaged portion. - In the
fuel supply apparatus 10 according to the embodiment, thepipe 20 has theexternal thread 22 as the second engaging portion at the base end portion, and therotary member 40 has theinternal thread 42 as the second engaged portion that is engageable with theexternal thread 22, as described above. The second engaging portion and the second engaged portion may be other than theexternal thread 22 and theinternal thread 42, respectively, in thefuel supply apparatus 10 according to the embodiment. Any other structures that can fix thepipe 20 to therotary member 40 may be used as the second engaging portion and the second engaged portion. - In the
fuel supply apparatus 10 according to the embodiment, the operatingportion 70 for rotating therotary member 40 is fixed to therotary member 40, as described above. Such a operatingportion 70 enables the cite workers to readily rotate therotary member 40 accommodated in thecylinder 30 fixed to the mounting portion of theblast tube 4 of the blast furnace 1, and thus to readily rotate thepipe 20. - In the
fuel supply apparatus 10 according to the embodiment, the locking holes 39 and the lockingpin 66 function as the locking mechanism for securing theretainer 60 engaging with thecylinder 30 to thecylinder 30, as described above. Such a locking mechanism can prevent the detachment of theretainer 60 from thecylinder 30 during the use of thefuel supply apparatus 10. - The embodiment described above should not be construed to limit the scope of the present invention, and various modifications can be made on the
fuel supply apparatus 10. - For example, the
spring 50, which is disposed around therotary member 40 accommodated in thecylinder 30 in the above description, may be omitted from thefuel supply apparatus 10 according to the embodiment described above. In addition, therotary member 40 may be rotated with any means other than operatingportion 70.
Claims (8)
- A fuel supply apparatus comprising:a cylinder attachable to a mounting portion of a blast tube of a blast furnace;a hollow rotary member rotatably accommodated in the cylinder, the rotary member having a base end through which fuel is to be fed into the rotary member;a pipe detachably fixed to an end of the rotary member, the end of the rotary member being adjacent to the blast furnace, the pipe having a front end through which the fuel is to be fed into the blast furnace; anda retainer detachably fixed to the cylinder, the retainer holding the rotary member in the cylinder, whereinthe cylinder has an inner periphery having a first sealing face,the rotary member has a second sealing face, andthe second sealing face comes into sealing contact with the first sealing face when the rotary member is accommodated in the cylinder.
- The fuel supply apparatus according to claim 1, wherein the fuel to be fed in the rotary member is pulverized coal, waste plastic, hydrogen gas or heavy oil.
- The fuel supply apparatus according to claim 1 or 2, further comprising an urging member biasing the second sealing face of the rotary member to the first sealing face of the cylinder.
- The fuel supply apparatus according to claim 3, wherein
the urging member comprises a spring, and
the second sealing face of the rotary member is biased to the first sealing face of the cylinder by a resilient force of the spring from a compressed state. - The fuel supply apparatus according to any one of claims 1 to 4, wherein
the cylinder has a first engaged portion on the inner periphery, and
the retainer has a first engaging portion detachably engaged with the first engaged portion. - The fuel supply apparatus according to any one of claims 1 to 5, wherein
the pipe has a base end portion having a second engaging portion, and
the rotary member has a second engaged portion engaged with the second engaging portion. - The fuel supply apparatus according to any one of claims 1 to 6, wherein a operating portion for rotating the rotating member is attached to the rotating member.
- The fuel supply apparatus according to any one of claims 1 to 7, wherein a locking mechanism for securing the cylinder and the retainer in an engaged state is provided.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2015/086225 WO2017109937A1 (en) | 2015-12-25 | 2015-12-25 | Fuel supply device |
Publications (3)
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EP3214187A1 true EP3214187A1 (en) | 2017-09-06 |
EP3214187A4 EP3214187A4 (en) | 2018-08-29 |
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EP15897894.0A Active EP3214187B1 (en) | 2015-12-25 | 2015-12-25 | Fuel supply device |
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JP (1) | JP6347896B2 (en) |
KR (2) | KR102179367B1 (en) |
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AU (1) | AU2015418375B2 (en) |
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US20220178612A1 (en) * | 2019-03-27 | 2022-06-09 | Jfe Steel Corporation | Method of heating up furnace bottom, and burner lance used in the method |
Family Cites Families (9)
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JPH02203096A (en) * | 1989-02-02 | 1990-08-13 | Sanko Kogyo Kk | Pipe joint |
JPH05195026A (en) * | 1992-01-14 | 1993-08-03 | Nippon Steel Corp | Method for operating blast furnace |
ES2123018T3 (en) * | 1992-07-01 | 1999-01-01 | Wurth Paul Sa | DEVICE FOR INJECTION OF SPRAYED COAL IN A HIGH-FURNACE POT. |
JP3294454B2 (en) * | 1994-12-02 | 2002-06-24 | 日本鋼管株式会社 | Blow lance |
JPH10237515A (en) * | 1997-02-26 | 1998-09-08 | Azuma Tekko Kk | Lance pipe for blast furnace |
LU91543B1 (en) * | 2009-03-24 | 2010-09-27 | Wurth Paul Sa | Tuyere stock arrangement for a blast furnace and method for operating a blast furnace |
JP5105293B2 (en) * | 2011-04-10 | 2012-12-26 | 株式会社トライテック | Blast furnace pulverized coal injection burner |
WO2014076847A1 (en) * | 2012-11-13 | 2014-05-22 | 株式会社トライテック | Pulverized coal blow-in burner for blast furnace |
JP5968835B2 (en) * | 2013-07-18 | 2016-08-10 | 新日鐵住金株式会社 | Pulverized coal blowing rotary lance |
-
2015
- 2015-12-25 RU RU2017101896A patent/RU2649160C1/en active
- 2015-12-25 AU AU2015418375A patent/AU2015418375B2/en active Active
- 2015-12-25 KR KR1020177017740A patent/KR102179367B1/en active IP Right Grant
- 2015-12-25 WO PCT/JP2015/086225 patent/WO2017109937A1/en active Application Filing
- 2015-12-25 KR KR1020167026695A patent/KR101761084B1/en active IP Right Grant
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JP6347896B2 (en) | 2018-06-27 |
KR102179367B1 (en) | 2020-11-16 |
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UA120855C2 (en) | 2020-02-25 |
KR101761084B1 (en) | 2017-07-24 |
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RU2649160C1 (en) | 2018-03-30 |
JPWO2017109937A1 (en) | 2017-12-21 |
EP3214187B1 (en) | 2019-11-06 |
TWI630275B (en) | 2018-07-21 |
CN107124890B (en) | 2019-11-05 |
CN107124890A (en) | 2017-09-01 |
AU2015418375A1 (en) | 2017-11-23 |
KR20180088579A (en) | 2018-08-06 |
AU2015418375B2 (en) | 2019-01-17 |
WO2017109937A1 (en) | 2017-06-29 |
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