JPS6135469B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heat-resistant lance for repairing a furnace, which is used in a furnace at a high temperature of, for example, about 1500°C.

Generally, a furnace repair lance is designed to spray powder such as refractory brick onto the inner surface of the furnace wall from a nozzle at the tip equipped with a burner. However, if such a lance adopts a triple tube structure and forms a cooling water passage between the outer tube and the middle tube and between the middle tube and the inner tube, stress and strain due to the difference in thermal expansion will be applied to the outer tube and the inner tube. Occurs in the middle canal.

In order to solve the above problems, the present invention has a seal provided between the ends of the outer tube and the middle tube of the triple tube so that the outer tube can expand and contract relative to the middle tube, thereby reducing the amount of expansion. This is designed to prevent stress and strain from occurring due to differences, and is explained as follows with reference to the drawings.

In FIG. 1, which is a partially cutaway side view, the lance 1 is a three-dimensional structure having an outer tube 2, a middle tube 3, and an inner tube 4 concentrically.
It has a double-tube structure, and is held in a horizontally extending position by pinch rollers 5 and 6 from above and below at multiple locations. The pinch rollers 5 and 6 are for moving the lance 1 in the direction of arrow F, and are attached to a lifting platform (not shown), so that the entire lance 1 can be moved up and down by moving the lifting platform. As shown in FIG. 2, which is a schematic cross-sectional view of FIG. A rod-shaped stopper 9 that fits into the groove 7 is fixed by spot welding. stopper 9
is for preventing rotation of the lance 1 itself and holding the nozzle part 13 at the front end (left end in Fig. 1) in a downward posture, for example, and is formed of a plurality of square rods as shown in Fig. 1. , these square bars are arranged parallel to and on the same straight line with the center A-A of the lance 1, separated by a cut 10.

Cooling water passages W1 and W2 are formed between the outer tube 2 and the middle tube 3 and between the middle tube 3 and the inner tube 4, respectively. Partition plates 11 and 12 made of spiral rods are provided in each passage W1 and W2, and the cooling water flows through the passage W1 and W2.
〓〓〓〓
1, it flows in a spiral shape inside W2.
Both passages W1 and W2 are connected in the nozzle part 13 at the front end, as described later, and the whole forms a reciprocating passage, and the outer passage W1 is a return passage (return passage).
Thus, the inner passage W2 is the outgoing passage.

A cooling water outlet Wa is provided at the rear end 2' of the outer tube 2, and an outlet pipe is provided at the flange 13 surrounding the outlet Wa.
The joint flange at the front end of WA is bolted. The pipe WA extends rearward (to the right in Fig. 1), and a flexible drainage hose (not shown) is connected to the rear end. The rear end parts 3' and 4' of the middle pipe 3 and the inner pipe 4 protrude rearward than the rear end part 2' of the outer pipe, and the rear end part 3' of the middle pipe has a cooling water inlet Wb and a flange surrounding it. 14 are provided. A joint flange at the front end of the cooling water inlet pipe WB is bolted to the flange 14. The pipe WB also extends rearward, and its rear end is connected to a flexible water supply hose (not shown).

The rear end portion 2' of the outer tube is provided with a thick-walled cylindrical gland 15 at a portion rearward of the flange 13, and the middle tube 3 is also provided with a thick-walled gland 16 inside the gland 15. A plurality of gland packings 17 are provided between the glands 15 and 16. The seal 17 is pressed from behind by a cylindrical seal presser 19, and its front end is in pressure contact with an annular step provided on the inner periphery of the front end of the gland 15. The seal retainer 19 has an outward flange 20 at its rear end, and the flange 20 is bolted to the rear end surface of the gland 15.

Inside the inner pipe 4 are utility pipes, that is, a powder pipe P for transferring furnace wall repair material powder, a fuel pipe L, and an oxygen pipe O in the center A-A.
These pipes L, O,
P is supported by a plurality of disc-shaped pipe supports 21 provided within the inner pipe 4. The supports 21 are provided at three locations, for example, at the front, middle, and rear of the inner tube 4, at right angles to the center A-A, and are each provided with holes into which the pipes L, O, and P fit. Two adjacent supports 21 are connected to each other by a plurality of bar-shaped spacers (not shown) parallel to the center, and the rear support 21 is connected to the rear support flange 24 at the rear end of the lance 1 by a similar spacer. has been done.

The flange 24 has holes into which the pipes L, O, and P fit, and is fixed together with the support seat 23 by bolts 25 to the annular flange 22 fixed to the rear ends of the middle pipe 3 and the inner pipe 4. The support seat 23 is a member that extends in an annular shape surrounding the pipes L, O, and P, and has a structure that can be split into two, and supports the front end of an angle frame-shaped support 26 that protrudes rearward. The pipes L, O, P and the cooling water pipes WA, WB are attached to the support 26 with U-bolts 27.
It is fixed by The ends of the pipes L, O, and P that protrude rearward from the support 26 are connected to flexible hoses (not shown) that supply utilities (oil, oxygen, powder), respectively.

The above-mentioned tubes 2, 3, and 4 are slightly widened in a tapered shape at a portion in front of the stopper 9.
A cylindrical flange 30 is fixed to the tubes 2, 3, and 4 at the tips of the tapered portions. As shown in FIG. 3, which is an enlarged partial view of FIG. 1, an annular flange 32 at the rear end of the nozzle portion 13 is fastened to the front end of the flange 30 with a plurality of bolts 33. Nozzle part 1
3 is a substantially L-shaped outer tube 2 bent downward in two stages, for example.
A, a middle tube 3a, and an inner tube 4a are provided concentrically, and the flange 32 is fixed to the rear ends of these tubes 2a, 3a, and 4a. Cooling water passages W3 and W are provided between the outer pipe 2a and the middle pipe 3a and between the middle pipe 3a and the inner pipe 4a.
Although not shown, each of the passages W3 and W4 is equally divided into two passages each having a semi-circular cross section by a pair of partition plates each bent in two stages. The flanges 30, 32 are provided with holes 35, 36 connecting the outer cooling water passages W1, W3 and holes 37, 38 connecting the inner cooling water passages W2, W4. As shown in FIG. 4, which is a schematic cross-sectional view of FIG.
It is provided over the entire circumference of 0.32. As shown in FIG. 3, an annular groove 40 is provided on the outer peripheral surface of the flange 30 for attaching and detaching the bolt 33 from the rear. The groove 40 connects the entire hole 35 in an annular manner and is covered from the outside in the radial direction by a seal ring 41. The seal ring 41 is cylindrical and fits into an O-ring 42 on the outer periphery of the rear end of the flange 30 and an O-ring 43 on the outer periphery of the flange 32, and is fixed to the flange 30 by bolts (not shown). has been done. Note that an O-ring 45 is installed between the inner peripheral portions of the flanges 30 and 32.

〓〓〓〓
Inner tube 4a at a position adjacent to flange 32
A support 46 made of plate assembly is provided on the inner peripheral surface of the
is installed. As shown in FIG. 5, which is a cross-sectional partial view of FIG.
It has an arcuate recess into which the tips P' and O' of the oxygen pipe O fit, and a hole through which the tip L' of the oil pipe L passes. As shown in Figure 3, the tips L', O',
The rear end of P' within the flange 30 or near the rear thereof is removably connected to the main bodies of the pipes L, O, and P via joints 47, 48, and 49, respectively.

An oxygen distribution chamber 50 is provided in the inner tube 4a of the nozzle portion 13.
An oxygen distribution header 51 is provided which forms a
A powder distribution header 54 is provided within the distribution chamber 50. The front end of the oxygen pipe tip O' is the header 51
The oxygen passage within the tip O' communicates with the distribution chamber 50. The powder pipe tip P' penetrates the wall of the header 51, and the lower end of the powder pipe passes through the wall of the header 51.
4, and the powder passage in the tip P' communicates with the powder distribution chamber 53 in the header 54.
The lower ends of both headers 51 and 54 are fixed to the upper end of an oil manifold 55. Manifold 5
5 is a disc-shaped member having an annular groove 56 on the outer periphery;
The lower end of the oil pipe tip L' is the manifold 55
The oil passage in the tip L' is connected to the groove 56 through the hole in the manifold 55.
is connected to. The groove 56 is closed by a seal pipe 57 attached to the outer circumference of the manifold 55, and the radial passage 5 in the manifold 55 is closed.
9 to a downward opening hole 60 in the center of the manifold 55. The manifold 55 includes a hole into which a powder pipe 61 is fitted and an oxygen passage hole 62. The pipe 61 extends parallel to the nozzle center NN, and its upper end communicates with the outer periphery of the powder distribution chamber 53. The hole 62 is also parallel to the nozzle center N--N, and its upper end communicates with the oxygen distribution chamber 50 at the radially outer portion of the header 54. Third
As shown in FIG. 6, which is a partial cross-sectional view, a large number of pipes 61 and holes 62 are provided on the same circumference, and the passages 59 are provided radially.

As shown in FIG. 3, a boss 65 is formed at the center of the lower end of the manifold 55, surrounding the hole 60 and protruding downward, and a seal pipe 6 is formed at the outer periphery of the lower end.
The upper end of 6 is fixed. A burner 67 with a circular cross section is provided on the lower side of the manifold 55.
With the burner 67 in contact with the boss 65 and the lower end of the pipe 66, the burner 67 is attached to the annular flange 69 fixed to the outer periphery of the lower end of the pipe 66 with the bolt 68.
Fixed by A chamber 70 having an annular cross section is formed between the pipe 66 and the boss 65, and the lower end of the oxygen passage hole 62 communicates with the chamber 70. The powder pipe 61 passes through a chamber 70 and fits into the hole of the burner 67, and the lower end of the pipe 61 is connected to the burner 67.
It opens on the bottom surface of 7. The burner 67 is provided with a large number of oxygen nozzle holes 71 and oil nozzle holes 72 on the outside and inside of the annularly arranged pipe 61, respectively. As shown in FIG. 7, which is a cross-sectional view of FIG. Connects to room 70,
The upper end of the hole 72 communicates with the hole 60.

A plurality of locations on the outer circumference of the burner 67 are fixed to the lower surface of an annular flange 76 via O-rings 90 by bolts 75 mounted from below. The flange 76 is fixed to the lower ends of the triple pipes 2a, 3a, 4a, and is provided with passages 79, 80 connecting the cooling water passages W3, W4 and the cooling water chamber 77 in the burner 67 inside. As shown in FIG. 7, chambers 77 are formed between adjacent bolts 75, and are arranged in an annular shape as a whole. As shown in FIG. 3, the O-ring 90 is provided on the outer peripheral side of the bolt 75 and the chamber 77. Also flange 76
An O-ring 91 is also provided at a portion of the burner 67 that fits into the inner circumferential surface of the burner 67 . A plug 81 is attached to the lower part of the insertion hole of the bolt 75 provided in the burner 67.

Explain the operation. In Figure 1, pipe L,
The oil, oxygen, and powder supplied to O and P are ejected from the burner 67 through the passage in the nozzle portion 13, and the powder is thermally sprayed onto the inner surface of the furnace wall along with the fire.
Also, the cooling water supplied from the inlet pipe WB is passed through the passage W.
2, flows into the chamber 77 through W4, turns around at the chamber 77, flows into the passage W3, and flows into the passage W3.
3 through W1 to outlet pipe WA. In this way, the cooling water flows along the entire circumference of the lance 1 in both the outward path (flow toward the burner 67 side) and the return path, so that the entire lance 1 is sufficiently cooled. Also, in the passages W1 and W2, the cooling water flows spirally along the partition plates 11 and 12, so that
〓〓〓〓
The lance 1 is cooled uniformly over its entire circumference.

During thermal spraying, the outer tube 2 becomes hotter than the middle tube 3, and due to the difference in thermal expansion, the outer tube 2 becomes hotter than the middle tube 3.
However, in that case, the gland packing 17 fixed to the rear end 2' of the outer tube will extend more than the middle tube 3.
Since the outer tube 2 and the inner tube 3 slide on the ground 16, no stress or strain is generated in the outer tube 2 or the inner tube 3 due to the difference in the amount of expansion.

There is also a difference in the amount of thermal expansion between the outer tube 2 and the stopper 9, but since the stopper 9 has a cut 10 and each stopper 9 is short, the outer tube 2 and the stopper 9
No large stress or strain will occur.

Next, the replacement work of the nozzle part 13 will be explained. Since the nozzle part 13 is a kind of consumable item, it needs to be replaced periodically.
1 and remove the bolt 33, and also remove the fixing bolt 68 of the burner 67 shown in FIG.
3 to the front, and then install a new nozzle part 13 in the reverse order.

In addition, the entire lance 1 is installed between the rollers 5 and 6 with the rear end at the tip, but in that case, the cooling water pipes WA and WB at the rear end are removed from the flanges 13 and 14, and the flange 23 is attached to the rear with the support 26. In this state, insert the lance 1 between the rollers 5 and 6.

As explained above, according to the present invention, the outer tube 2,
Pass the utility pipes L, O, and P through the inner pipe 4 of the triple pipe, which is equipped with a middle pipe 3 and an inner pipe 4, between the outer pipe 2 and the middle pipe 3, and between the middle pipe 3 and the inner pipe 4. cooling water passages W that communicate with each other at one end (chamber 77);
1 and W2, and seals 17 are provided at mutually adjacent ends 2' and 3' of the outer tube 2 and the middle tube 3 to allow relative expansion and contraction of the outer tube 2 with respect to the middle tube 3. Therefore, the lance 1 can be sufficiently cooled, and stress and distortion can be prevented from being generated in the outer tube 2 and the inner tube 3 due to the difference in the amount of thermal expansion.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view, Fig. 2 is a schematic cross-sectional view of Fig. 1, Fig. 3 is an enlarged partial view of Fig. 1,
Figures 4, 5, 6, and 7 are respectively 3
It is a -, -, -, - cross-sectional partial view of the figure. 1... Lance, 2... Outer tube, 3... Middle tube, 4...
...Inner pipe, 17...Seal, L, O, P...Utility pipe, W1, W2...Cooling water passage. 〓〓〓〓

Claims (1)

[Claims] 1 A utility pipe is passed through the inner pipe of a triple-layered pipe comprising an outer pipe, a middle pipe, and an inner pipe, and cooling water is communicated with each other at one end between the outer pipe and the middle pipe and between the middle pipe and the inner pipe. 1. A heat-resistant lance, characterized in that a passage is provided and seals are provided at mutually adjacent ends of the outer tube and the middle tube to allow relative expansion and contraction of the outer tube with respect to the middle tube.