JP6539860B2 - Stab cooler - Google Patents

Description

  The present invention relates to a stave cooler including a stave main body attached to a furnace inner surface of a steel shell and having a cooling pipe embedded therein, and a cooling pipe communicating with the cooling pipe.

In general, a stab cooler is attached to the inner surface of the furnace wall of the blast furnace for the purpose of cooling protection of the furnace shell, and the furnace life is extended.
In a general stave cooler 100, as shown in FIGS. 5-8, a plurality of (for example, four) cooling pipes 20 extending vertically are embedded in the stave main body 10, and cooling water is respectively supplied to the cooling pipes 20. The cooling effect on the furnace wall is achieved by flowing W from the lower side to the upper side. Then, a cooling pipe 40 communicating with the cooling pipe 20 is welded to the furnace outer surface of the stave main body 10, and the cooling water W is sent to the stave main body 10 from the furnace outer side of the iron shell.
Further, on the furnace inner surface of the stave main body 10, a plurality of ribs 30 extending substantially horizontally in the left-right direction are arranged, and in the grooves between the upper and lower ribs 30, the refractory material is charged.

  Here, in the stave cooler 100 of the conventional example shown in FIG. 5, there is a problem that the upper end and the lower end of the stave main body 10 thermally deform on the furnace inner surface side and curve due to temperature change in the furnace.

The stave cooler 100 which is hard to produce a thermal deformation is proposed with respect to this problem (for example, refer patent documents 1-3).
In the invention described in Patent Document 1, a plurality of ribs extending horizontally on the furnace inner surface of the stave main body are provided, the ribs and the stave main body are made of different materials, and a cushioning material is interposed between the ribs and the stave main body. By doing this, thermal deformation is prevented.

Moreover, invention of patent document 2 prevents a thermal deformation by forming the longitudinal reinforcement rib by making the left-right-side edge part of the back side (furnace outside) of a stave main body thicker than other parts.
Furthermore, the invention described in Patent Document 3 prevents thermal deformation by arranging a plurality of rows of refractory materials in the longitudinal direction and holding the row by the base metal ribs.

Patent 2932985 gazette JP-A-9-209012 JP-A-8-134519

  However, even the stave cooler 100 described in Patent Documents 1 to 3 in which measures against thermal deformation are taken can delay the time when the thermal deformation occurs, but can not completely prevent the thermal deformation.

  Since the cooling pipe 40 is fixed to the stave main body 10 or the furnace outside when the thermal deformation occurs in this way, the cooling pipe 40 can not flexibly follow the thermal deformation, and along with the bending of the stave main body 10 The bending force is applied to the cooling pipe 40 to generate high stress at the welded portion of the root of the cooling pipe 40. If this accumulates, fatigue cracks will occur.

The welded portion connects the cooling pipe 40 and the stave main body 10, and at the same time, serves as a seal for the cooling water W flowing inside, so even a slight crack leads to water leakage and functions as the stave cooler 100 I can not
And when these leaks become severe, replacement of the stab cooler 100 is needed.
However, since the replacement work of the stave cooler 100 requires a large cost, a technology for extending the life of the stave cooler 100 is required.

  Therefore, an object of the present invention is to provide a stave cooler in which a crack is not easily generated in the connection portion between the cooling pipe and the stave body even if the stave body is thermally deformed.

In order to achieve the above object, the stave cooler (200) according to claim 1 of the present invention is attached to the inner side of the iron shell constituting the furnace wall of the vertical furnace, and the cooling water (W) is A stave main body (11) in which a cooling pipe (20) for water flow is embedded, and a cooling pipe (40) connected to the furnace outer surface of the stave main body (11) and communicating with the cooling pipe (20) A stave cooler (200) comprising: a reinforcing member (50) having a through hole (51) and attached to the cooling pipe (40) in a state of surface contact with the stave main body (11) In addition example Bei,
The connection between the stave main body (11) and the cooling pipe (40) is performed by welding to form a weld bead (B), and the inward end of the through hole (51) of the reinforcing member (50) It is characterized in that the diameter of the welding bead (B) is accommodated in the enlarged diameter portion (52) by enlarging the diameter more than other portions .

The stab cooler (200) according to claim 2 is characterized in that a sealing O-ring (53) is attached to the inner surface of the reinforcing member (50).

  Here, the symbols in the parentheses indicate corresponding elements or items described in the drawings and the modes for carrying out the invention described later.

According to the stave cooler of the present invention, since the reinforcing member which has the through hole and is externally fitted to the cooling pipe and attached in a state of surface contact with the stave main body is further provided, the stave main body is thermally deformed Even if bending occurs, the reinforcing material makes surface contact with the stave body and receives the force due to its deformation, and by attaching the reinforcing material, the substantial length of the cooling pipe is shortened and the torque generated is reduced. The stress can be prevented from concentrating at one connection portion between the cooling pipe and the stave main body, and a crack is less likely to occur at the connection portion between the cooling pipe and the stave main body. As a result, the life of the stave cooler can be extended.
Further, while the stave main body and the cooling pipe are connected by welding to form a weld bead, the diameter of the weld bead is increased by increasing the diameter of the furnace inner end of the through hole of the reinforcing member more than other portions. Since the wire is housed in the portion, even if a weld bead is formed at the furnace inner end of the cooling pipe, the reinforcing member can be reliably brought into surface contact with the stave main body.

Further , according to the present invention, since the sealing O-ring is attached to the inner side surface of the reinforcing material, the sealing performance is further improved.

  As in the stave cooler of the present invention, the above-mentioned Patent Documents 1 to 3 have a reinforcing material which has a through hole and is externally fitted to a cooling pipe and attached in a state of surface contact with the stave main body. Not listed at all.

It is a principal part expanded sectional view showing a stave cooler concerning a first embodiment of the present invention. It is a principal part expanded sectional view showing a stave cooler concerning a second embodiment of the present invention. It is a principal part expanded sectional view showing a stave cooler concerning other embodiments of the present invention. It is an expansion perspective view showing a reinforcing material in a stave cooler concerning other embodiments of the present invention. It is a perspective view showing a stab cooler. It is a rear view which shows the stave-cooler shown in FIG. It is AA sectional drawing shown in FIG. It is a principal part enlarged view of the stave cooler which concerns on a prior art example.

First Embodiment
A stave cooler 200 according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 5 to 7.
The stab cooler 200 includes a stave main body 10, a cooling pipe 40, and a reinforcing material 50, and is characterized in particular by a method of connecting the stave main body 10 and the cooling pipe 40.
The same parts as those shown in the conventional example are given the same reference numerals.

  A plurality of stave coolers 200 according to an embodiment of the present invention are attached in the vertical direction and the lateral direction (circumferential direction) to the inner side of the furnace wall (iron skin) of a vertical furnace (not shown) such as a blast furnace. ing. A joint material made of a refractory material is applied to a gap between the adjacent stave coolers 200.

  The stave main body 10 has a thin plate shape, and as shown in FIG. 6 and FIG. 7, a plurality of cooling pipes 20 extending vertically are embedded in the lateral direction at intervals. Cooling water W is passed through the cooling pipes 20 as a cooling medium from the lower side to the upper side, and the cooling effect on the furnace wall is achieved.

And as shown in FIG. 5, a plurality of (here, 11) ribs 30 are disposed on the inner side surface of the stave main body 10.
The ribs 30 extend substantially horizontally in the left-right direction and are arranged in a plurality of rows at regular intervals in the vertical direction, and the refractory material is inserted into the grooves between the adjacent upper and lower ribs 30. The size and shape of the ribs 30 are not particularly limited, but in the present embodiment, the thickness is approximately half of the thickness of the stave cooler 200 itself, and the width is the uppermost rib 30A (30) and The lowermost rib 30B (30) is wider than that of the nine ribs 30 between them, and all of them are substantially rectangular in cross section. All 11 ribs 30 can also be of the same width. In addition, the shape and arrangement of the ribs 30 on the inner side of the furnace are not limited to this, and for example, in addition to such horizontal ribs 30, vertical ribs may be arranged.
Further, as the material of the stave main body 10, oxygen-free copper was selected in consideration of the thermal conductivity.

Cooling pipe 40 is connected to the furnace outer surface of stave main body 10 and in communication with cooling pipe 20, and cooling water W is circulated in stave main body 10 via a pump (not shown) arranged outside the furnace. .
Here, the stave main body 10 and the cooling pipe 40 are connected by welding, and a weld bead B is formed.

As shown in FIG. 1, the reinforcing member 50 is a cylindrical integral body (but the outer shape is not limited to a circular shape) having a through hole 51, and the inner diameter is a diameter that can be extrapolated to the cooling pipe 40 . That is, the diameter of the through hole 51 of the reinforcing member 50 is slightly larger than the outer diameter of the cooling pipe 40, and the cooling pipe 40 can be inserted into the through hole 51 of the reinforcing member 50.
The furnace inner end of the through hole 51 of the reinforcing member 50 is expanded in diameter from the other part of the through hole 51, and the enlarged diameter portion 52 is expanded in a tapered shape from the furnace outer side toward the furnace inner side. The size of the enlarged diameter portion 52 is such a size that can accommodate the weld bead B of the welded portion of the stave main body 10 and the cooling pipe 40. Although the portion where the weld bead B is released should not interfere with the weld bead B, it is also necessary to avoid that the contact (contact) area of the reinforcing material 50 becomes small, so this portion is unnecessary It is important not to take too much.
Then, with the furnace inner side surface of the reinforcing member 50 in surface contact with the stave main body 10, the furnace inner side surface of the reinforcing member 50 and the furnace outer side surface of the stave main body 10 are sealed and fixed by welding, The space between the furnace outer surface of the material 50 and the outer peripheral surface of the cooling pipe 40 is also sealed and fixed by welding. That is, the width (thickness) in the height direction of the reinforcing member 50 in contact with the stave main body 10 on the inner surface of the furnace is sufficient to receive the pressure when the cooling pipe 40 is bent. It is preferable that the thickness is equal to or greater than the thickness of the cooling pipe 40. That is, the term "surface contact" as used herein refers to contact with a wider area than that of linear contact, for example, to receive a force due to thermal deformation over a wide area to reduce pressure.
The material of the reinforcing member 50 is not particularly limited, but here, in consideration of the ease of welding, the same oxygen-free copper as the stave main body 10 is used.
At this time, the weld bead B at the weld between the stave main body 10 and the cooling pipe 40 is not in contact with the reinforcing member 50.

According to the stab cooler 200 configured as described above, the stave main body 100 further includes the reinforcing member 50 having the through holes 51 and externally fitted to the cooling pipe 40 and attached in a state of surface contact with the stave main body 10 Even if bending occurs in the cooling pipe 40 due to thermal deformation of 10, the reinforcing member 50 makes surface contact with the stave main body 10 and receives a force due to the deformation, and by attaching the reinforcing member 50, the substance of the cooling pipe 40 By reducing the specific length and reducing the generated torque, it is possible to prevent the concentration of stress at one connection portion between the cooling pipe 40 and the stave main body 10. Therefore, since it is hard to produce a crack in the connection part of cooling piping 40 and the stave main body 10, the lifetime of the stave cooler 200 can be extended.
In particular, while welding between the furnace inner side surface of reinforcing material 50 and the furnace outer surface of stave main body 10 and welding between reinforcing material 50 and the outer peripheral surface of cooling pipe 40, reinforcing material 50 is firmly fixed. At the same time, the stress due to the bending load is dispersed in the two places, and cracks hardly occur in the welded portion B of the stave main body 10 and the cooling pipe 40.

  Even if a crack occurs in the welded portion B of the stave main body 10 and the cooling pipe 40, welding between the furnace inner side surface of the reinforcing member 50 and the furnace outer side surface of the stave main body 10 and the outer peripheral surface of the reinforcing material 50 and the cooling pipe 40 Since the welding is sealed, the water does not leak immediately, and the stab cooler 200 can be used continuously until these seals are broken.

  Further, since the inner end of the through hole 51 of the reinforcing member 50 is expanded in diameter more than other parts so that the weld bead B is accommodated in the enlarged diameter portion 52, the inner end of the cooling pipe 40 is Even if the weld bead B is formed, the reinforcing member 50 can be reliably brought into surface contact with the stave main body 10.

Second Embodiment
Next, a stave cooler 200 according to a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are given the same reference numerals.

The difference between this embodiment and the first embodiment is the shape of the enlarged diameter portion 52 of the reinforcing member 50, and the other components are the same as in the first embodiment.
The diameter-increased portion 52 of the reinforcing material 50 in the present embodiment has the same diameter at all points.
Even with such a configuration, the reinforcing material 50 can be reliably brought into surface contact with the stave main body 10 by exchanging the weld bead B with the enlarged diameter portion 52 of the reinforcing material 50.

In the first and second embodiments, the furnace inner side surface of the reinforcing member 50 and the furnace outer side surface of the stave main body 10 are welded, and the reinforcing member 50 and the outer peripheral surface of the cooling pipe 40 are welded. It may be crimped as shown in FIG. 3, or may be carried out by other means such as brazing or fastening with a bolt.
When a fixing method other than welding is adopted for connection between the stave main body 10 and the cooling pipe 40, if there is no interfering portion like the weld bead B when making the furnace inner side surface of the reinforcing member 50 surface contact with the stave main body 10, The enlarged diameter portion 52 is not necessary for the through hole 51 of the reinforcing material 50.

  Further, as shown in black in FIG. 4, a heat-resistant O-ring 53 for sealing may be attached to the inner surface of the reinforcing member 50 in the furnace. Thereby, the sealability is further improved.

  Further, it is preferable to seal between the furnace inner side surface of the reinforcing member 50 and the furnace outer side surface of the stave main body 10 and between the reinforcing member 50 and the outer peripheral surface of the cooling pipe 40, but these positions are temporarily sealed. Even if it does not, it becomes difficult to produce a crack in welding part B of stave main body 10 and cooling piping 40.

  In addition, although the reinforcing member 50 is an integral body, it may be a half objective.

DESCRIPTION OF SYMBOLS 10 stave main body 20 cooling pipe 30 rib 30A uppermost rib 30B lowest rib 40 cooling piping 50 reinforcing material 51 through-hole 52 enlarged diameter part 53 O ring 100 stave cooler 200 stave cooler B weld bead (welded portion)
W cooling water

Claims (2)

A stave main body which is attached to an inner side of an iron shell constituting a furnace wall of a vertical furnace, and in which a cooling pipe for passing cooling water is embedded;
And a cooling pipe connected to the furnace outer surface of the stave main body and in communication with the cooling pipe.
Further example Bei the attached reinforcement in a state of surface contact with the stave body with extrapolated to the cooling pipe has a through hole,
The connection between the stave main body and the cooling pipe is performed by welding to form a weld bead,
A stave cooler characterized in that the furnace inner end portion of the through hole of the reinforcing member is made larger in diameter than other portions so that the weld bead is accommodated in the diameter enlarged portion . The stave cooler according to claim 1 , characterized in that a sealing O-ring is attached to an inner side surface of the reinforcing member.