JP5968835B2 - Pulverized coal blowing rotary lance - Google Patents

Description

  The present invention relates to a pulverized coal blowing rotary lance used for blowing pulverized coal from a blast furnace tuyeres into a furnace.

  In the operation of iron blast furnaces, in order to reduce the amount of coke used and maintain the combustion temperature at the tip of the tuyere, an operation method in which pulverized coal is blown into the furnace from the tuyere and burned is performed.

  At this time, if a lance pipe that cannot change the blowing direction of the pulverized coal is used, the tip of the lance pipe is gradually deformed by the heat of the blast furnace, and the pulverized coal or the like cannot be fed to an appropriate position. As a result, pulverized coal hits the tuyere directly, and the tuyere may be damaged or worn.

  Therefore, conventionally, as disclosed in Patent Documents 1 and 2, a lance pipe for injecting pulverized coal is rotatably mounted so that the discharge direction of the pulverized coal can be adjusted.

  Patent Document 1 was previously proposed by the present applicant, and is provided so as to adjust the insertion depth of the lance pipe and the rotation of the blowing direction by attaching a cylinder and a driving device to the lance pipe. .

  Patent Document 2 also has a drive mechanism provided on the lance tube, and the lance tube is rotatably adjusted by turning a handle provided in the drive mechanism.

No. 6-8985 Japanese Patent Laid-Open No. 10-237515

  However, in the rotation mechanism described in Patent Document 1, in order to mount the cylinder and the driving device on the lance pipe, it is necessary to fix the cradle to the blower branch pipe and to mount these rotation mechanisms on the cradle. The structure of the rotating mechanism was complicated. As a result, there is a problem that a lot of labor is required for attaching and maintaining the lance tube and the manufacturing cost is increased.

  Also, in the drive mechanism described in Patent Document 2, since it is directly connected to the rear end portion of the lance pipe, the lance pipe can be rotated if the position of the lance pipe with respect to the drive mechanism is not accurately connected. It becomes difficult. In addition, if the heat of the blast furnace is transmitted to the drive mechanism, the drive mechanism may be distorted due to thermal expansion.

  Therefore, the present invention has been devised to solve the above-described problems. When the tip of the lance tube is deformed due to high heat, the blast furnace can be manually rotated even during operation. An object of the present invention is to provide a pulverized coal-injected rotary lance that can reliably prevent gas leakage inside.

In order to achieve the above object, the first means in the present invention is a blast furnace rotary lance in which pulverized coal is blown into the furnace from the blast furnace tuyere P, and an air outlet Q for supplying oxygen toward the tuyere P A guide cylinder 10 that is inserted and fixed in advance in a granular material injection port R that is disposed obliquely with respect to the guide cylinder 10, a connection cylinder 20 that is detachably connected to the opening end of the guide cylinder 10, and a connection A rotary joint 30 that is rotatably fitted and housed inside the cylinder 20 and has a stainless steel lance pipe 40 fixed to the front end of the blast furnace and a supply pipe 50 fixed to the rear end, and a connecting cylinder. And a fixing nut 60 that is fixed to the connecting cylinder 20 by being screwed to the outer surface of the rotary joint 30 and is connected to the connecting cylinder 20 when the pulverized coal is blown. The lance tube 40 together with the rotary joint 30 is fastened to the cylindrical body 20 and the guide cylinder. 0 to fixed and lies in the configured allowed to rotate the rotary joint 30 by the lance tube 40 by loosening the fixing nut 60 when the lance tube 40 rotates.

  In the second means, the connecting cylinder 20 protrudes from the outer side surface of the connecting cylinder 20 on the inner side of the guide cylinder 10 and the metal seal portion 21 to be crimped to the inside of the opening of the guide cylinder 10. An engaging protrusion 22 that engages with the side surface and an operation handle 23 that protrudes from the outer surface on the rear end side of the connecting cylinder 20 are provided.

  In the third means, the rotary joint 30 has the lance pipe 40 welded to the front end side, the supply pipe 50 welded to the rear end side, and an O-ring 31 attached to the outer periphery of the rotary joint 30. Thus, the gas leakage during the rotation of the rotary joint 30 is prevented.

  The fourth means is configured to increase the flow rate of the pulverized coal by forming a taper 33 gradually narrowing in the through hole 32 communicating with the lance pipe 40 from the supply pipe 50 in the rotary joint 30. is there.

  5. The pulverized coal blowing rotation according to claim 1, wherein the fifth means comprises welding a plurality of round bars 41 along the longitudinal direction to the peripheral side surface of the lance tube 40 on the tip side so as to increase the strength of the tip side. Expression lance.

  As in claim 1, the fixed nut 60 is fastened to the connecting cylinder 20 when the pulverized coal is blown, and the lance pipe 40 is fixed to the guide cylinder 10 together with the rotary joint 30, and the fixed nut 60 is loosened when the lance pipe 40 is rotated. By configuring the lance tube 40 to rotate 30 together, when the tip of the lance tube is deformed, it is possible to manually rotate the lance tube 40 and adjust the pulverized coal blowing position even when the blast furnace is in operation. . As a result, it is no longer necessary to mount a conventional rotating mechanism or driving mechanism, and it is possible to make an accurate adjustment at a very low cost.

  According to claim 2, since the connecting cylinder 20 includes the metal seal portion 21 that is crimped to the inside of the opening of the guide cylinder 10, when the connecting cylinder 20 is fixed to the guide cylinder 10 by pressure bonding, Gas leakage can be reliably prevented. Further, an engaging projection 22 that protrudes from the outer surface on the distal end side of the connecting cylinder 20 and engages with the inner surface of the guide cylinder 10 is provided, and for operation that protrudes from the outer surface on the rear end side of the connecting cylinder 20. Since the handle 23 is provided, by operating the operation handle 23, an operation of detachably mounting the engagement protrusion 22 on the opening end of the guide tube 10 is facilitated.

  According to the third aspect of the present invention, since the rotary joint 30 has the lance pipe 40 welded to the front end side and the supply pipe 50 welded to the rear end side, the rotary joint 30 and the lance pipe 40 and the supply pipe 50 are connected together. It can be rotated. Moreover, since the O-ring 31 is mounted on the outer periphery of the rotary joint 30, gas leakage during the rotation of the rotary joint 30 is prevented, and safe work is possible even with a manual rotation operation. .

  According to the fourth aspect of the present invention, the taper 32 that becomes gradually narrower is formed in the through hole 32 of the rotary joint 30, so that a Venturi effect is produced and the flow rate of pulverized coal can be increased.

  When the pulverized coal is blown into the peripheral side surface on the distal end side of the lance pipe 40 by welding a plurality of round bars 41 along the longitudinal direction so as to increase the strength on the distal end side, as in claim 5. The tip of the lance tube 40 can be prevented from shaking due to the wind pressure.

It is sectional drawing which shows the use condition of this invention. It is principal part sectional drawing which shows one Example of this invention. It is sectional drawing which shows one Example of the guide cylinder of this invention. It is sectional drawing which shows one Example of the connection cylinder of this invention. It is sectional drawing which shows one Example of the rotary joint of this invention.

  As described above, according to the present invention, when the tip of the lance tube is deformed, the blast furnace can be manually rotated even during operation, and gas leakage in the furnace can be reliably prevented during use. The original purpose was realized.

  Examples of the present invention will be described below. A reference symbol P shown in FIG. 1 is a tuyere of a blast furnace, and is provided with a blowing port Q for supplying oxygen toward the tuyere P and a granular material blowing port R for supplying pulverized coal. The main configuration of the present invention includes a guide tube 10, a connecting tube 20, a rotary joint 30, and a lance tube 40 (see FIG. 2).

  The guide tube 10 is a member that is inserted into and fixed to the granular material blowing port R in advance, and is fixed by various fixing means corresponding to the shape of the granular material blowing port R. In the example of illustration, the connection port 11 which connects the connection cylinder 20 mentioned later, and the cylinder 12 inserted in the inside of the granular material injection | pouring port R are provided. And the guide pipe | tube 10 fixed by forcibly fitting inside the granular material injection | pouring opening R is shown (refer FIG. 3).

  The connecting cylinder 20 is a cylinder that is inserted into the guide cylinder 10 and is detachably connected to the guide cylinder 10 (see FIG. 2). The illustrated connecting cylinder 20 is provided with a metal seal portion 21 to be crimped to the inside of the opening of the guide cylinder 10 on the distal end side, and is configured to prevent gas leakage during crimping (see FIG. 4). Further, a plurality of engaging protrusions 22 project radially from the outer surface on the distal end side of the connecting cylinder 20, and the engaging protrusions 22 are engaged with the engaging recesses 13 provided on the inner surface of the guide cylinder 10. To match.

  Further, a plurality of plate-like operation handles 23 are provided on the outer surface of the connecting cylinder 20 on the rear end side (see FIG. 2). The operator holds the operation handle 23 and engages the engagement protrusion 22 of the connecting cylinder 20 into the engagement recess 13 of the guide cylinder 10.

  The rotary joint 30 is a member that is rotatably fitted and housed inside the connecting cylinder 20 (see FIG. 2). A lance tube 40 is fixed to the front end of the connecting cylinder 20 and a supply tube 50 is fixed to the rear end portion. And the fixing nut 60 screwed to the outer side surface of this connection cylinder 20 is provided, and this fixing nut 60 is tightened, latching to the flange 34 provided in the rear part of the rotary joint 30. FIG. Then, the rotary joint 30 is pressure-bonded and fixed in the connecting cylinder 20, and the guide cylinder 10, the connecting cylinder 20, and the rotary joint 30 are integrated to fix the blowing position of the lance pipe 40 when pulverized coal is blown. It is.

  The illustrated rotary joint 30 is formed by welding a lance pipe 40 and a supply pipe 50, and an O-ring 31 is mounted on the outer periphery of the rotary joint 30 (see FIG. 2). The O-ring 31 is a member that prevents gas leakage when the rotary joint 30 rotates. That is, when the lance tube 40 is rotated, the fixing nut 60 is loosened and the lance tube 40 is rotated together with the rotary joint 30. At this time, the O-ring 31 prevents gas from leaking from the gap between the connecting cylinder 20 and the rotary joint 30.

  Further, the rotary joint 30 is formed with a through hole 32 communicating from the supply pipe 50 to the lance pipe 40 (see FIG. 5). A taper 33 that gradually narrows is formed in the through hole 32. Then, when pulverized coal is sent from the supply pipe 50 to the lance pipe 40, a Venturi effect is generated in the through hole 32 of the rotary joint 30, and the flow rate of the pulverized coal increases.

  The lance pipe 40 is a stainless steel pipe facing the tuyere P of the blast furnace, and is welded to the tip of the rotary joint 30 (see FIG. 2). When the pulverized coal is blown into the furnace from the tip of the lance tube 40, the pulverized coal is prevented from contacting the tuyere P. Therefore, when the tip of the lance tube 40 is deformed at a high temperature and the discharge port of the lance tube 40 faces downward, the lance tube 40 is rotated and adjusted so that the discharge port faces directly into the furnace. A plurality of round bars 41 along the longitudinal direction are welded to the lance tube 40 of the illustrated example on the peripheral side surface on the distal end side at intervals (see FIG. 2). The round bar 41 increases the strength of the tip side of the lance tube 40 and prevents the stainless steel lance tube 40 from shaking due to the wind pressure that discharges pulverized coal.

  The supply pipe 50 is a pipe that supplies pulverized coal from the hose for blowing pulverized coal to the lance pipe 40 (see FIG. 2). At the rear end of the supply pipe 50, a connecting screw part 51 for screwing a hose for blowing pulverized coal is provided. When the lance pipe 40 is replaced, the hose for blowing pulverized coal is supplied from the supply pipe 50. Easy to remove.

  In addition, the structure of this invention is not limited to the example of illustration, The fixing means of the guide cylinder 10 to the granular material blowing inlet R, the fixing means of the guide cylinder 10 and the connection cylinder 20, etc. are changed arbitrarily. Is something that can be done.

P tuyere Q air blowing port R granular material blowing port 10 guide tube 11 connecting port 12 tube 13 engaging recess 20 connecting tube 21 metal seal portion 22 engaging protrusion 23 operation handle 30 rotary joint 31 O-ring 32 penetrating Hole 33 Taper 34 Flange 40 Lance pipe 41 Round bar 50 Supply pipe 51 Connection thread

Claims (5)

In a rotary lance for a blast furnace where pulverized coal is blown into the furnace from the blast furnace tuyere,
A guide cylinder that is inserted and fixed in advance in a granular material blowing port disposed obliquely with respect to the air blowing port that supplies oxygen toward the tuyere , and is detachably connected to the opening end of the guide tube. A connecting cylinder;
A rotary joint that is rotatably fitted and housed inside the connecting cylinder, and a lance pipe made of stainless steel is fixed to the front end of the blast furnace and a supply pipe is fixed to the rear end;
A fixing nut that is screwed to the outer surface of the connecting cylinder and is locked to the rear end of the rotating joint to fix the rotating joint to the connecting cylinder;
The fixed nut is fastened to the connecting cylinder when pulverized coal is blown, and the lance pipe is fixed to the guide cylinder together with the rotary joint, and the lance pipe is rotated together with the rotary joint by loosening the fixed nut when the lance pipe is rotated. A pulverized coal blow rotary lance.   The connecting cylinder includes a metal seal portion that is crimped to the inside of the opening of the guide cylinder, an engagement protrusion that protrudes from an outer surface on the distal end side of the connecting cylinder and engages with an inner surface of the guide cylinder, The pulverized coal-injecting rotary lance according to claim 1, further comprising an operation handle protruding from an outer surface on the rear end side of the connecting cylinder.   In the rotary joint, the lance pipe is welded to the front end side, the supply pipe is welded to the rear end side, an O-ring is attached to the outer periphery of the rotary joint, and gas leakage occurs during rotation of the rotary joint. The pulverized coal blow-in rotary lance according to claim 1, which is configured to prevent.   4. The pulverized coal injection rotation according to claim 1, wherein in the rotary joint, a gradually narrowing taper is formed in a through hole communicating with the lance pipe from the supply pipe to increase a flow rate of the pulverized coal. Expression lance.   The pulverized coal blow-in rotary lance according to claim 1, wherein a plurality of round bars are welded along the longitudinal direction to the peripheral side surface of the lance tube on the tip side so as to increase the strength on the tip side.

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