JPH0718653B2 - Insulator for water cooling pipe of heating furnace - Google Patents

Description

TECHNICAL FIELD The present invention relates to a heat insulator for a water-cooling pipe of a heating furnace, which is attached to an outer peripheral surface of a water-cooling pipe of a heating furnace so as to be laminated in the axial direction thereof to insulate the water-cooling pipe. Regarding

[Prior Art] Insulation of a water-cooled pipe of a heating furnace is performed by a heat insulating body made of ceramic fiber, which has a large energy saving effect, instead of a material having a large thermal conductivity such as castable refractory.

A ceramic fiber bracket or a heat insulator made of felt is attached to the outer peripheral surface of a water-cooled pipe by stacking it in the axial direction so that the cut surfaces are parallel to the surface of the water-cooled pipe. For example, heat insulators described in JP-A-55-131682, JP-B-50-42009 and JP-B-56-52271 are known.

As shown in Fig. 5a, the heat insulating body 1 described in JP-A-55-131682 is made of a ceramic fiber blanket or a molded product, and has an annular disc-like shape obtained by cutting a part of the annular disc into a fan shape. And a plurality of holes 2 are provided. As shown in FIG. 5b, this heat insulating body 1 is provided with combs in holes 2 on the outer peripheral surface of a metal water-cooling pipe 6 provided with a skid button 3 and a fixture 5 having a comb 4 on the outer peripheral surface. 4 are attached so as to be laminated in the axial direction so as to pass therethrough. Reference numeral 7 in FIG. 5b is a castable refractory material filled between the skid button 3 and the heat insulator 1.

As shown in Fig. 6a, the heat insulator 8 described in Japanese Utility Model Publication No. 42009/2009 has a disk shape made of a ceramic fiber blanket or felt, and has a radial cut 9 in a part thereof. ing. Then, as shown in FIG. 6B, the heat insulating body 8 is fitted on the outer peripheral surface of the water cooling pipe 10 through the slit 9 and is also laminated and attached in the axial direction.

As shown in FIG. 7a, the heat insulator 11 disclosed in Japanese Utility Model Publication No. 56-52271 discloses a band member 11a made of a ceramic fiber blanket or felt and a fold line of the band member 11a folded in two in the width direction. It is composed of an inorganic or organic fastener 11b such as a wire or a flammable string which is included in the vicinity. Then, as shown in FIG. 7b, the heat insulating body 11 is formed by winding the band-shaped material 11a with the fastener 11b and stacking the band-shaped material 11a in the axial direction on the outer peripheral surface of the water-cooled pipe 12 while contacting the folds of the band-shaped material 11a. Then installed.

According to the above-mentioned heat insulators 1, 8 and 11, all are water-cooled pipes 6 and 1.
Since they can be compressed and laminated in the axial direction of 0 and 12, it is possible to compensate for joint opening at high temperature, and at the same time, to comb 4 and fastener 11b.
Since the fixtures such as are located in a relatively low temperature portion (on the water-cooled pipe side), there is an advantage that the fixtures are not easily affected by high-temperature oxidation and that they are difficult to peel off when a coating layer is applied to the surface.

[Means for solving problems]

However, according to the heat insulator 1 of FIG. 5a, when the water cooling pipe 6 is attached, a large number of combs 4 and fixing fittings 5 are required, which requires a lot of time and labor for the construction.
It will be a large proportion of the construction cost.

In addition, the heat insulators 8 and 11 shown in FIGS. 6a and 7a are heat insulators 8 and 11 that surround the entire circumference of the water cooling pipe perpendicular to the hearth such as a post.
It is applicable when covered with 11, but not applicable to water-cooled pipes of all shapes. That is, for example, like a skid pipe in a pusher type heating furnace, a fixed beam and a moving beam in a walking beam type heating furnace, a water cooling pipe that is horizontal to the hearth and has rails, buttons, etc. mounted above it. Is not applicable to.

Further, while the heat insulator 11 of FIG. 7a is compressed at the fold portion of the band-shaped material 11a during construction, the opposite portion is stretched to form the outer periphery of the heat insulating structure, so that the water-cooled pipe having a small diameter is used. With respect to No. 12, there is an inconvenience that the opposite portion cannot be sufficiently stretched and the portion is broken.

Therefore, the present invention is a heat insulator for a water-cooling pipe of a heating furnace, which can be deformably and closely attached to a water-cooling pipe of any diameter and cross-section and can be easily attached, and which is less deteriorated by oxidation of the fitting. Is to provide.

[Problems to be solved by the invention]

In order to solve the above-mentioned problems, the present invention is an insulator for a water-cooling pipe of a heating furnace, which is attached to an outer peripheral surface of a water-cooling pipe of a heating furnace so as to be laminated in the axial direction thereof to insulate the water-cooling pipe. A ring-shaped fibrous heat insulating material and a circular disc-shaped member having a width smaller than that of the fibrous heat insulating material with the folded folds on the inner circumference side being formed in an annular shape and having an intermediate thickness on the inner circumference side of the fibrous heat insulating material. The wire mesh is embedded in the vicinity of the portion, and the tightening wire is enclosed near the folds of the wire mesh and has both ends guided to the outside of the fibrous heat insulating material.

[Action]

According to the above means, when attached to the water cooling pipe, the inner peripheral side of the fibrous heat insulating material is brought into close contact with the outer peripheral surface of the water cooling pipe due to the deformation of the wire mesh, and the fastening wire is wound around the outer periphery of the water cooling pipe or the fastening wire. The heat insulator is attached by locking both ends of studs to the studs planted in the water cooling pipe, and the wire mesh and the tightening wire are arranged on the low temperature side.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS.

In the figure, 15 is a blanket of ceramic fibers or a semi-annular plate shape cut from a felt made of a mixture of ceramic fibers and polycrystalline fibers such as alumina fibers and mullite fibers, or made from the above materials by a vacuum forming method. The fibrous heat insulating material prevents the heat in the furnace from being transmitted to the water cooling pipe (not shown).

The fibrous heat insulating material 15 is preferably a semi-circular plate having a central angle θ of about 180 degrees, which is economical and preferable from the standpoint of material retention, but a part of the circular plate is cut into a fan shape. It is also possible to use a disc-shaped disc having a central angle θ of an arbitrary angle within 360 degrees.

The inner radius R of the fibrous heat insulating material 15 need only be approximately equal to the outer radius of the water-cooled pipe, and need not be exactly equal. This is because the water-cooled pipe may be a metal pipe alone, or the outer peripheral surface of the metal pipe may be pre-insulated with a heat insulating material such as castable refractory. The accuracy is not good, it does not always have a uniform outer diameter, and the diameter may vary depending on the location, or the cross section of the metal pipe may be deformed into an oval or other irregular shape. This is because the quality heat insulating material 15 itself has flexibility.

Further, the outer radius of the fibrous heat insulating material 15 is determined in consideration of the width L ₁ of the fibrous heat insulating material 15 that can obtain a necessary heat insulating effect. The width L ₁ is preferably 50 to 75 mm, for example.

Reference numeral 16 denotes a wire mesh that links the fibrous heat insulating material 15 and a fastening wire to be described later, and a rectangular wire mesh having the same width as the width L ₁ of the fibrous heat insulating material 15 is folded in half with a half width L ₂ and the folded mountain is formed. Is formed in the shape of a semi-circular plate having a width half that of the fibrous heat insulating material 15 on the inner circumferential side, and a fold mountain is formed near the middle portion of the thickness on the inner circumferential side of the fibrous heat insulating material 15. It is exposed from the inner periphery of 15 by about 0 to 5 mm and is embedded via an adhesive (not shown).

The wire net 16 is not limited to the case of stacking two pieces over the entire width,
If the wire mesh itself is strong enough, only 2 near the fold
You may make it overlap.

The width L _{2 of the} wire mesh 16 is preferably as large as possible so as to enhance the bonding strength with the fibrous heat insulating material 15, but the fibrous heat insulating material 15
If it extends to the outer peripheral portion of the fibrous heat insulating material 15, it is easily damaged by oxidation due to high temperature, so that it is preferably about half the width L ₂ of the fibrous heat insulating material 15, as described above.

Further, the folds of the wire mesh 16 are not limited to being exposed and may be completely buried in the fibrous heat insulating material 15. When the folds are exposed, this portion directly comes into close contact with the outer peripheral surface of the water cooling pipe when it is attached to the water cooling pipe, and there is an advantage that it is efficiently cooled and is not oxidatively worn.
On the contrary, when the fold ridge is buried, there is an advantage that the inner peripheral portion of the soft fibrous heat insulating material 15 becomes a cushion when attached to the water cooling pipe, and the adhesion to the outer peripheral surface of the water cooling pipe is further improved. However, when the folded portion is buried too deep in the fibrous heat insulating material 15, this portion is easily oxidized, and it is necessary to select a material such as a wire mesh with a more heat resistant material.

Embedding the wire netting 16 in the fibrous heat insulating material 15 has a thickness of 25 to 50 mm.
When the two heat insulating material segments (not shown) are integrally bonded with an adhesive, a wire mesh is formed between the two heat insulating material segments.
16 is buried by embedding, or processed so that the inner circumference side of fibrous heat insulating material 15 with a thickness of 50 to 100 mm is cut into two pieces,
The wire mesh 16 is embedded in the incision with an adhesive. When attaching two heat insulation material segments, the adhesive is wire mesh
It may be applied to 16 parts or the entire area.

The adhesive needs to fix the wire net 16 to the fibrous heat insulating material 15 even at a high temperature, and most of the adhesive is preferably inorganic and heat resistant. For example, alumina cement, refractory mortar prepared by mixing aluminum phosphate, alkali silicate or colloidal silica into a refractory aggregate as a binder, the binder and an organic binder such as polyacrylic amide or carbosylmethyl cellulose, and polycrystalline fiber. An adhesive made by kneading heat-resistant fibers such as or ceramic fibers is used.

Reference numeral 17 denotes a tightening wire that is enclosed near the folds of the wire netting 16 and has both ends guided to the outside of the fibrous heat insulating material 15, and the fibrous heat insulating material 15 is attached to the water cooling pipe together with the wire netting 16.

The tightening wire 17 is required to have strength enough to reliably support the fibrous heat insulating material 15 and the like on the water-cooled pipe, and a heat resistant wire having a diameter of 0.5 to 1.5 mm is preferably used. That is, since the tightening wire 17 is used on the side close to the water-cooled pipe (low temperature side), the material thereof may be ordinary steel, but if the fibrous heat insulating material 15 is damaged by external force and there is a concern that it will be exposed as a result. , Heat resistant steel should be used.

Further, it is desirable that the tightening wire 17 is slidably contained in the wire net 16. By doing so, the position of the tightening wire 17 with respect to the fibrous heat insulating material 15 can be changed by pulling one end thereof, and the workability in attaching the fibrous heat insulating material 15 to the water cooling pipe can be improved.
However, as will be described later, when both ends of the tightening wire 17 are stopped on studs of a water cooling pipe, etc.
It may be fixed to.

Next, the case where the heat insulating body having the above-mentioned structure is used to cover the entire circumference of the water cooling pipe with heat insulation will be described with reference to FIG. 3. 18 is a water cooling pipe made of iron and having a diameter of 120 mm. Reference numeral 19 is a heat insulating material, which is a fibrous heat insulating material obtained by sticking together two heat insulating material segments cut out from a 25 mm thick ceramic fiber blanket with an inner radius of 120 mm, a width of 50 mm and a central angle of 210 degrees 19a and a wire with a diameter of 0.5 mm and a mesh of 5 mm. 2
It consists of a wire mesh 16b with a width of 25 mm folded in two and a tightening wire 19c that is enclosed near the folds of the wire mesh 19b and has both ends guided outside the fibrous heat insulating material 19a. About 0.5 mm is exposed from the inner periphery of the fibrous heat insulating material 19a, and the fibrous heat insulating material 19a is embedded in the fibrous heat insulating material 19a by using a refractory mortar mixed with aluminum phosphate as an adhesive.

To attach the heat insulating body 19 to the water cooling pipe 18, a fastening wire 19c is wound around the outer peripheral surface of the water cooling pipe 18 in a spiral shape so that the inner peripheral side of the fibrous heat insulating material 19a covers the outer peripheral surface of the water cooling pipe 18. Tightening wire 19c of the heat insulator 19 that precedes it
While connecting the tightening wire 19c of the subsequent heat insulator 19 one after another, the subsequent fibrous heat insulating material 19a is moved along the tightening wire 19c and the circumferential end surface of the preceding fibrous heat insulating material 19a is moved. The fibrous heat insulating material 19a, which is in contact with the end face in the circumferential direction, is attached to the water cooling pipe 18 by laminating it in the axial direction of the water cooling pipe 18 without any gap.

During the attachment, the wire netting 19b is deformed according to the cross-sectional shape of the water cooling pipe 18 by the tightening wire 19c wound around the water cooling pipe 18, and the fibrous heat insulating material 19a is also deformed due to the deformation of the wire netting 19b, and is also deformed. The shape is maintained.

Further, the tightening wires 19c of the individual heat insulators 19c are not limited to the case where they are bound in order, but the tightening wires 19c of several heat insulators 19c in advance.
May be attached to one long wire.

In addition, referring to FIG. 4, a case of heat-insulating and coating about a half circumference of a water-cooling pipe using the heat insulator having the above-mentioned structure will be described. 20 is an iron water-cooling pipe with an outer radius of 115 mm having a skid button 21 on the upper part, and the skid button 21 The studs 22 are pre-welded to the outer peripheries near both ends of the. Reference numeral 23 is a heat insulating body, which is made of the same fibrous heat insulating material 23a as that of the heat insulating body 19 shown in FIG. 3 except that the central angle is 180 degrees, a wire mesh 23b, and a tightening wire 23c. The inner radius of the heat insulating material 23a is 5 mm larger than the outer radius of the water cooling pipe 20.

To attach this heat insulator 23 to the water cooling pipe 20,
One end of the fastening wire 23 of 23 is locked to the stud 22 on one side, the fibrous heat insulating material 23a is appropriately moved along the fastening wire 23c, and then the wire net 23b is placed on the lower peripheral surface of the water cooling pipe 20. While pressing and deforming it, press the fibrous heat insulating material 23a against the lower peripheral surface of the water cooling pipe 20 so that it is sufficiently adhered, and then tighten the tightening wire 23c.
The other end of the is locked to the stud 22 on the other side. Thereafter, the subsequent heat insulator 23 is laminated on the water insulator pipe 23 without gaps in the axial direction of the water insulator pipe 20, and is similarly attached to the water cool pipe 20.

After the lower peripheral surface of the water cooling pipe 20 is heat-insulated and covered by the heat insulating body 23, the stud 22 is planted and the outer peripheral surface of the water cooling pipe 20 is coated with fibrous refractory plastic (not shown).

〔The invention's effect〕

As described above, according to the present invention, when attached to the water cooling pipe, the inner peripheral side of the fibrous heat insulating material is brought into close contact with the water cooling pipe due to the deformation of the wire mesh, so that the diameter and cross-sectional shape of the water cooling pipe are partially irregular. Even if there is one, one standard type can be used.

Moreover, since the attachment to the water cooling pipe is performed by winding the fastening wire around the outer circumference of the water cooling pipe or by locking both ends of the fastening wire to the studs planted in the water cooling pipe, the attachment to the water cooling pipe has been conventionally performed. Can be performed more easily and firmly, resulting in higher vibration resistance.

Further, since the wire mesh and the tightening wire are arranged on the low temperature side, they are safe because they are not deteriorated by oxidation.

[Brief description of drawings]

FIG. 1 is a sectional view of a heat insulator showing an embodiment of the present invention, and FIG.
FIG. 1 is a sectional view taken along line II-II in FIG. 1, and FIGS. 3 and 4 are perspective views showing the heat insulating covering state of the water cooling pipe according to the present invention on the entire circumference and about half circumference, respectively, and FIG. Sixth
FIGS. 7A and 7B are a perspective view of a conventional heat insulator and a perspective view of a water-cooled pipe heat-insulated by the conventional heat insulator, respectively. 15 …… Fiber insulation, 16 …… Wire mesh 17 …… Tightening wire

Claims (1)

[Claims] 1. A heat insulator for a water-cooling pipe of a heating furnace, which is attached to an outer peripheral surface of a water-cooling pipe of a heating furnace in a laminated manner in the axial direction thereof to insulate the water-cooling pipe, the fibrous heat insulation having a circular disc shape. Material and a wire mesh that is formed in the shape of a circular disc having a width smaller than that of the fibrous heat insulating material, with the crests on the inner circumferential side when folded in half, and embedded near the middle part of the thickness on the inner circumferential side of the fibrous heat insulating material. And a heat-insulating body for a water-cooling pipe of a heating furnace, the heat-insulating body including a wire mesh, and both ends of which are enclosed near a fold line of the wire mesh and are guided to the outside of a fibrous heat insulating material.