JP2021127850A - Member and method of cooling the member - Google Patents

Abstract

To provide a member with further excellent cooling capacity, and a method of cooling the member.SOLUTION: A member is used for a device used in a heating environment, and has a base material having a long hollow part for passing a cooling medium, a core material arranged in the hollow part along the longitudinal direction of the hollow part, and projections arranged projectingly from an outer surface of the core material into a space between the base material and the core material. The projections are spirally arranged in the axial direction of the core material.SELECTED DRAWING: Figure 1

Description

The present invention relates to a member for an apparatus used in a heating environment, for example, a member for an apparatus used in a high temperature atmosphere such as around a melting furnace or inside a melting furnace, and a cooling method for the member.

Members for equipment used in a heating environment, for example, members used around the melting furnace or near molten metal (melting temperature: 500 ° C or higher) in the melting furnace, are cooled to prevent deformation due to thermal expansion. It is necessary. For example, as a cooling method of the oxygen lance for inserting into the molten metal of the melting furnace and injecting oxygen, the lance is a double pipe, and the inner pipe of the double pipe is the outward pipe of the cooling air and the outer pipe. A technique is disclosed in which the road is a return route, cooling air is circulated during work, and the lance is cooled from the inside (Patent Document 1).

JP-A-61-288007

However, Patent Document 1 is limited to the case where the oxygen lance is inserted into the front side of the furnace, and when the member is inserted to the opposite side of the furnace (the inner part of the furnace) and used, most of the member is exposed to a high temperature atmosphere. There is a problem that heat easily flows into the member and the cooling capacity of the member is insufficient.

Therefore, an object of the present invention is to provide a member having a more excellent cooling ability and a method for cooling the member.

The present invention is a member for an apparatus used in a heating environment, in which a base material having a long hollow portion for flowing a cooling medium and the hollow portion are arranged along the longitudinal direction of the hollow portion. It has a core material and a protrusion arranged so as to project from the outer surface of the core material into the space between the base material and the core material, and the protrusion is in the axial direction of the core material. It is a member characterized in that it is arranged spirally toward.

Further, in the member, it is preferable that at least a part of the tip of the protrusion and the inner wall of the base material are separated from each other.

Further, the core material is a tubular member, and preferably has at least one opening on the surface.

Further, the present invention is a cooling method for cooling a member for an apparatus used in a heating environment by using a cooling medium, wherein the member has a base material having a long hollow portion and a base material having a long hollow portion in the hollow portion. The cooling medium has a core material arranged along the longitudinal direction thereof and a protrusion arranged so as to project from the outer surface of the core material into the space between the base material and the core material. The member is cooled by a flow flowing through the hollow portion and traveling along the protrusion and a flow traveling in a gap space formed by the inner wall of the base material and the protrusion. This is a method for cooling members.

According to the present invention, it is possible to provide a member having a more excellent cooling ability and a method for cooling the member.

It is an internal schematic diagram of the member 100 for a device in 1st Embodiment. It is an internal schematic diagram which shows the state in which the protrusions according to this invention are arranged in a spiral shape. It is a schematic diagram which showed the behavior of the cooling medium flowing in the member 100 for an apparatus in 1st Embodiment. It is an internal schematic diagram of the member 200 for a device in 2nd Embodiment. It is a schematic diagram which showed the behavior of the cooling medium flowing in the member 200 for an apparatus in 2nd Embodiment.

Hereinafter, embodiments of the member according to the present invention and the method for cooling the member will be described in detail with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, in order to clarify the explanation, the following description and drawings have been simplified as appropriate.

(First Embodiment)
As shown in FIG. 1, the member 100 for an apparatus used in a heating environment according to the present embodiment has a base material 1 having a long hollow portion for flowing a cooling medium and a hollow portion in the base material 1. , The core material 2 arranged along the longitudinal direction of the hollow portion (longitudinal direction of the base material 1) and arranged so as to project from the outer surface of the core material 2 into the gap space between the base material 1 and the core material 2. It has a protrusion 3 and a protrusion 3. The heated environment includes a directly or indirectly heated environment, and also includes the heated environment itself and its vicinity. For example, the member of the present embodiment is around a heat source used in a high temperature atmosphere such as around a melting furnace or inside a melting furnace, that is, in an environment requiring a cooling mechanism in order to maintain characteristics such as strength. Used.

As the material of the base material 1, light alloys such as copper and aluminum, stainless steel, rolled steel materials for general structures, super heat resistant alloys (Fe group, Ni group, Co group, etc.), and molded bodies such as ceramics and graphite are used. For example, SUS304 when used at 700 ° C. to 800 ° C., SUS310S when used in a higher temperature environment (for example, 1000 ° C. or higher), general structure when it is desired to suppress deformation due to heat. It is possible to use a rolled steel material that has been aluminized (calorizing treatment).
The shape may have a hollow structure, and the cross section perpendicular to the axial direction may be a circular shape or a polygonal shape. For example, a tubular member, a piping member, or the like can be used.

Like the base material 1, the core material 2 is made of light alloys such as copper and aluminum, stainless steel, rolled steel materials for general structures, super heat resistant alloys (Fe group, Ni group, Co group, etc.), ceramics, graphite, etc. A molded body or the like can be used. For example, SUS304 when used at 700 ° C to 800 ° C, SUS310S when used in a higher temperature environment (for example, 1000 ° C or higher), and rolled steel for general structure when it is desired to suppress deformation due to heat. Can be used after being subjected to aluminazing (calorizing treatment).
As for the shape, an area for joining the protrusions 3 is secured. Further, when the protrusions 3 are continuously joined, it is preferable to use a bar having a polygonal cross section perpendicular to the axial direction. Further, it suffices to have a hollow structure, and for example, a tubular member, a piping member, or the like can be used.

Similar to the base material 1 and the core material 2, the material of the protrusion 3 is a light alloy such as copper or aluminum, stainless steel, rolled steel for general structure, super heat resistant alloy (Fe group, Ni group, Co group, etc.), and ceramics. A molded product such as or graphite can be used, for example, SUS304 when used at 700 ° C to 800 ° C, SUS310S when used in a higher temperature environment (for example, 1000 ° C or higher), and heat. When it is desired to suppress deformation, a rolled steel material for general structure that has been subjected to aluminaization (calorizing treatment) can be used.

In the embodiment shown in FIG. 1, the protrusion 3 has a fin shape that is spirally continuous in the axial direction, that is, a screw shape, as shown in FIG. As for the shape of the protrusion 3, as shown in the protrusion 3 shown in FIG. 3, the cross section of the core material 2 along the axial direction extends to the same width in the radial direction of the core material 2, and FIG. Like the protrusion 3 shown inside, a fin shape having a cross section along the axial direction of the core material 2 that tapers in the radial direction of the core material 2 can be used. Further, the protrusions 3 may be arranged in a spiral shape as a whole, and it is possible to provide a notch, an opening or the like in a part thereof, or to arrange the protrusions 3 in a spiral shape intermittently. ..

The protrusions 3 can be provided at predetermined intervals (pitch) in the axial direction of the core material 2, and the intervals can be changed according to the purpose. The narrower the interval, the higher the heat transfer coefficient, and the pressure of the cooling medium 41 to be introduced tends to decrease in the process of flowing through the gap space formed by the base material 1, the core material 2, and the protrusion 33. On the other hand, as the interval is widened, the heat transfer coefficient tends to decrease, and the pressure of the cooling medium 41 to be introduced is increased in the process of flowing through the gap space formed by the base material 1, the core material 2, and the protrusion 3. It becomes difficult to decrease. That is, for the purpose of increasing the cooling efficiency, it is desired to reduce the interval and avoid a decrease in the pressure of the cooling medium 41 to be introduced and the cooling medium 42 flowing through the gap space formed by the base material 1, the core material 2 and the protrusion 3. In some cases, it is preferable to increase the interval.

The protrusions 3 are spirally arranged along the axial direction of the core material 2. Further, in the protrusion 3, it is preferable that at least a part of the tip of the protrusion 3 and the inner wall of the base material 1 are separated from each other, and the tip of the protrusion 3 and the inner wall of the base material 1 are all separated from each other. Is even more preferable. Since the tip of the protrusion 3 and the inner wall of the base material 1 are separated from each other, the introduced cooling medium 41 flows along between the protrusion 3 and the inner wall of the base material 1, so that the base material The area in contact with the inner wall of 1 can be increased, and efficient cooling can be expected. The distance between the tip of the protrusion 3 and the inner wall of the base material 1 can be, for example, 0.1 mm or more and 5.0 mm or less, and more preferably 0.1 mm or more and 1.0 mm or less.

In the member 100 for the apparatus according to the first embodiment, the cooling medium 41 is introduced into the gap space formed by the base material 1, the core material 2, and the protrusion 3. The cooling medium 41 traveling in the gap space between the base material 1 and the core material 2 is cooled by the protrusions 3 spirally arranged in the gap space along the spiral direction of the protrusions 3. It proceeds as a medium 42 and cools the member.

As described above, in the case of the member for the apparatus according to the first embodiment, the cooling medium 41 which was originally a laminar flow becomes a turbulent cooling medium 42 which advances along the spiral direction of the protrusion 3. , The heat transfer coefficient is improved and the temperature can be lowered efficiently.
Furthermore, the gap space formed by separating at least a part of the tip of the protrusion 3 and the inner wall of the base material 1 creates a cooling medium 43 that advances in the gap space, so that the flow velocity increases and heat is generated. Further improvement in transmission rate can be expected, and the temperature can be lowered more efficiently.

(Second Embodiment)
Next, the member 200 for the device according to the second embodiment will be described. It should be noted that this embodiment is a modification of a part of the first embodiment, and in FIG. 3, the same parts as those of the first embodiment are designated by the same reference numerals.

As shown in FIG. 4, the shape of the core member 2 of the member 200 for the apparatus of this embodiment is different from that of the first embodiment. Then, in the member 200 for the apparatus of the present embodiment, the core material 2 has a hollow portion 21 as a hollow tubular member, and at least one (for example, one end side of the core material 2) is provided on the surface of the core material 2. It has an opening 22.
In the second embodiment 200, when the cooling medium introduced into the core material 2 from the other end side reaches the opening 22 provided on the side surface of the core material 2 (one end side), the cooling medium is formed through the opening 22. It is discharged into the gap space between the material 1 and the core material 2. As shown in FIG. 4, since one end side of the base material 1 is closed, the released cooling medium 41 is a gap space formed between the base material 1, the core material 2, and the protrusion 3 by the pressure of being pushed out. In the direction opposite to the direction in which the hollow portion 21 has flowed through the hollow portion 21. Further, as shown in FIG. 5, the cooling medium 41 traveling in the gap space between the base material 1 and the core material 2 has a protrusion 3 formed by a protrusion 3 spirally arranged in the gap space. The cooling medium 42 that travels along the spiral direction and the cooling medium 43 that travels in the gap space formed by the tip of the protrusion 3 and the inner wall of the base material 1 proceed and cool. Then, after flowing through the gap space formed by the base material 1, the core material 2, and the protrusion 3, the material is discharged through the opening 11 (discharge port) provided on the side surface on the other end side of the base material 1.

Further, since the cooling medium 41 can be conveyed to a predetermined position (for example, one end side of the member), in addition to the excellent cooling performance of efficiently cooling the entire member 200, for example, one end side of the member 200. When heat is concentrated on, one end side of the heat can be locally cooled.

Next, using the same configuration as that of the embodiment shown in FIG. 4, the cooling effect was evaluated by simulation under the following conditions.
For the model used in the simulation, the base material is a SUS304 pipe with an inner diameter of 30.7 mm and a wall thickness of 1.65 mm, and the side surface on one end side has a diameter for discharging the cooling medium from the inside of the base material. One 15.0 mm opening (exhaust port) was arranged. The core material is a tubular material made of SUS304 having an inner diameter of 7.1 mm and a wall thickness of 1.7 mm. One opening (supply port) having a diameter of 6.0 mm was arranged to supply the cooling medium. The protrusions are screw-shaped with an outer diameter of 30.0 mm (thickness 1.7 mm) and an interval of 3.0 mm, and are positioned 10.0 mm away from the opening (supply port) in the axial direction of the core material. Arranged in a spiral shape.
Further, in the comparative example, a straight pipe having the same inner diameter and the same thickness as the base material of the example was used.

(Simulation conditions)
The environment temperature was 500 K, and compressed air having a temperature of 300 K and a supply pressure of 0.5 MPa was used as the cooling medium.
Using the compressed air, a cooling medium is introduced into the core material of the above member, and is discharged through an opening (supply port) on the side surface of the core material in a gap space formed by a pipe as a base material and the core material. ^{Evaluate the heat transfer coefficient [W / (m 2} · K)] 38.5 mm behind the opening (supply port) when the discharged cooling medium is circulated to the position of 10 pitches of fins. bottom. Further, the flow velocities at the time of introducing compressed air were set to 10 m / sec, 15 m / sec, and 20 m / sec, and evaluation was performed at each flow velocity.

Table 1 shows the results of comparing the heat transfer coefficient [W / (m ^{2 · K)] between the examples and the comparative examples.} As shown in Table 1, at any of the flow velocities of 10 m / sec, 15 m / sec, and 20 m / sec, Example 1 has a higher heat transfer coefficient than Comparative Example and has excellent cooling performance. It turned out that there was.
This is because the compressed air discharged from the opening (supply port) collides with the fins of the protrusion and travels toward the opening (discharge port) along the spiral direction while forming a turbulent flow. This is because the flow velocity of the compressed air flowing through the gap space formed between the tip of the fin and the inner wall of the tubular material as the base material is improved by limiting the flow path.
It was confirmed that the heat transfer coefficient [W / (m ² · K)] shows the same value even when the environmental temperature is 1500 K.
As described above, by achieving these two effects, the heat transfer coefficient is improved, and the result shows that the cooling performance is superior to that of the cooling by the straight pipe.

1: Base material 11: Opening 2: Core material 21: Hollow part 22: Opening 3: Protruding part 4: Cooling medium 41: Cooling medium 42: Cooling medium 43: Cooling medium 100: Member 200: Member

Claims (4)

A member for equipment used in a heating environment.
A base material having a long hollow part for flowing a cooling medium,
A core material arranged in the hollow portion along the longitudinal direction of the hollow portion,
It has a protrusion arranged so as to project from the outer surface of the core material into the space between the base material and the core material.
A member characterized in that the protrusions are spirally arranged in the axial direction of the core material. The member according to claim 1, wherein at least a part of the tip of the protrusion and the inner wall of the base material are separated from each other. The core material is
It is a tubular member
The member according to claim 1 or 2, wherein the member has at least one opening on the surface. A cooling method that uses a cooling medium to cool members for equipment used in a heating environment.
The member includes a base material having a long hollow portion and
A core material arranged along the longitudinal direction in the hollow portion,
It has protrusions that are spirally arranged so as to project from the outer surface of the core material into the space between the base material and the core material.
The cooling medium is circulated in the hollow portion, and the cooling medium is circulated in the hollow portion.
A method for cooling a member, which comprises cooling the member by a flow traveling along the protrusion and a flow traveling in a gap space formed by the inner wall of the base material and the protrusion.

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