TW201831827A - Superheated steam generating device and manufacturing method of conductor pipe used thereby characterized in that the reactance can be reduced by forming a short circuit in the conductor pipe and the breakage possibilities of the joint portion and the conductor pipe can be reduced - Google Patents

Abstract

The present invention provides a superheated steam generating device and a manufacturing method of conductor pipe used thereby, in which the reactance can be reduced by forming a short circuit in the conductor pipe and the breakage possibilities of the joint portion and the conductor pipe can be reduced. The superheated steam generating device uses the magnetic flux generating mechanism arranged at the inside or the outside of the winded portion of the conductor pipe to carry out an inductive heating for the conductor pipe which is spirally winded as a round pipe, so that the steam flowing in the conductor pipe is heated to be superheated steam. On the general entirety of the winded portion of the conductor pipe, the opposite faces of the joint portions next to each other are joined by the joint portion, and the thickness of the joint portion is equal to or larger than that of the conductor pipe.

Description

Superheated water vapor generating device and manufacturing method of conductor tube used in the device

The present invention relates to a superheated water vapor generating device that generates superheated water vapor by heating water vapor flowing in the conductor tube by induction heating the spirally wound conductor tube.

Conventionally, in such a fluid heating device, as shown in Patent Document 1, in a spirally wound conductor tube forming a secondary coil, the conductor tubes adjacent to each other at a winding portion are short-circuited to constitute a short circuit. Fluid heating devices that reduce the reactance to increase heating efficiency have been known to the public.

Here, the electrical connection member extending in the axial direction of the spiral is connected to a part of the winding portion in the circumferential direction by welding or the like, or the conductor tubes adjacent to each other of the winding portion are locally welded and joined to each other, thereby forming the Short circuit.

However, the electrical connection member or the welded portion serving as the joint portion becomes a high temperature due to the concentration of the short-circuit current, and a stress is generated due to the deformation caused by the thermal expansion of the wound portion of the conductor tube, which causes the problem that the joint portion and the conductor tube are damaged.

Prior art literature

Patent Document 1: Japanese Patent Laid-Open Publication No. 2010-71624

The present invention has been made to solve the problems described above. The main object of the present invention is to reduce the reactance by forming a short circuit in a conductor tube, and to reduce the possibility of damage to the joint and the conductor tube.

That is, the present invention provides a superheated water vapor generating device which induction-heats a spirally wound circular conductor tube by a magnetic flux generating mechanism provided inside or outside the winding portion of the conductor tube, thereby The water vapor flowing in the conductor tube is heated to generate superheated water vapor. In the winding portion of the conductor tube, the mutually facing surfaces of adjacent portions adjacent to each other span substantially the entire circumference and are electrically conductive. The joint is bonded at a flexible joint, and the thickness of the joint is equal to or greater than the thickness of the conductor tube.

According to such a superheated water vapor generating device, in the winding portion of the conductor tube, the adjacent portions adjacent to each other are substantially joined by the joining portion across the circumferential direction (the entire joining), so that thermal expansion caused by local joining can be avoided. The stress is concentrated on the joint, which can reduce the possibility of damage to the joint and the conductor tube. In addition, since the conductor tube has a circular tube shape and a recessed portion is formed between adjacent portions adjacent to each other, by providing a joint portion in the recessed portion, a contact area between the joint portion and an outer peripheral surface of the conductor tube can be increased. With this structure, it is possible to reduce the concentration of stress on the joint.

Here, if the distance between the conductor tube and the joint portion from the induction coil of the magnetic flux generating mechanism is the same, it is desirable that the thickness of the joint portion and the tube thickness of the conductor tube have the same value.

However, in a structure in which the conductor tube has a circular tube shape and a joint portion is provided between adjacent portions adjacent to each other, the distance between the joint portion and the induction coil is larger than that of the conductor tube. If the distance from the induction coil is large, the magnetic coupling is weakened and the induced voltage is reduced, so the amount of heat generated in this portion is reduced.

In this way, if a temperature difference occurs between the conductor tube and the joint, mechanical stress is generated due to the difference in thermal elongation and causes damage such as cracking. Therefore, it is important to make the amount of heat generation as uniform as possible.

When the thickness of the joint portion is equal to or greater than the thickness of the conductor tube, the resistance value of the joint portion can be reduced, and the amount of heat generated by the joint portion can be increased due to an increase in current. As a result, it is possible to uniformize the amount of heat generated by the conductor tube and the joint portion.

The joint may be formed by welding. In the case of welding and joining, since the molten metal material easily fills the recessed portions between adjacent portions adjacent to each other, the welding operation can be facilitated.

In order to easily uniformize the heat generation amount by adjusting the thickness, it is preferable that the resistivity of the material of the joint portion and the resistivity of the material of the conductor tube are substantially the same.

In consideration of the operability of the entire joining of the wound portion of the conductor pipe, it is preferable that the joining portion is provided on the outer surface side of the wound portion. In addition, in order to make the magnetic coupling of electromagnetic induction favorable, it is preferable that the magnetic flux generating mechanism is provided on both the inside and the outside of the winding portion of the conductor tube.

Preferably, the joint portion is received in a recessed portion formed by the adjacent portions adjacent to each other. According to this configuration, it is possible to prevent the radial dimension of the magnetic flux generating mechanism arranged outside or inside the winding portion of the conductor tube from increasing.

In addition, the present invention provides a method for manufacturing a conductor tube, which is used in a superheated water vapor generating device, and heats water vapor flowing in the interior by induction heating to generate superheated water vapor. The entirety of the winding portion of the conductor tube is welded and joined to surfaces of adjacent portions adjacent to each other, and the thickness of the filler (cover) of the welded joint is equal to or greater than the thickness of the tube of the conductor tube.

According to the present invention configured as described above, in the winding portion of the conductor tube, the adjacent portions adjacent to each other are joined by the joint portion across the entire circumferential direction. Therefore, a short circuit can be formed in the conductor tube, and the reactance can be reduced. The possibility of damage to the joint and the conductor tube can be reduced.

Hereinafter, one embodiment of the superheated steam generating device 100 of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the superheated steam generating device 100 generates superheated steam exceeding 100 ° C. (200 ° C. to 2000 ° C.) by heating water or steam. The superheated steam generation device 100 has a spirally wound A circular tubular conductor tube 2 and a magnetic flux generating mechanism 3 for inductively heating the conductor tube 2.

The conductor tube 2 is formed of a metal tube, and has a spirally wound winding portion 2x. An introduction port P1 for introducing water or water vapor is formed at one end of the conductor tube 2 and an end portion for the other end is formed. The outlet P2 for discharging the generated superheated steam is discharged. An external pipe for supplying water or water vapor to the body pipe 2 is connected to the introduction port P1, and an external pipe for supplying the generated superheated steam to the use side (for example, a heat treatment room) is connected to the sink port P2.

The magnetic flux generating mechanism 3 includes an iron core 31 and an induction coil 32 wound along the iron core 31. An AC power source (not shown) is connected to the induction coil 32 and supplies controlled power to the induction coil 32. An induction coil 32 supplied with power from an AC power source becomes a primary coil, and as a result of power supplied by the primary coil, an induced current flows in the conductor tube 2, and the conductor tube 2 becomes a secondary coil.

The induction coil 32 of the present embodiment is arranged coaxially with the winding portion 2x of the conductor tube 2. The induction coil 32 includes an inner induction coil 32a disposed inside the winding portion 2x, and an outer induction coil 32b disposed outside the winding portion. . By arranging the inner induction coil 32a and the outer induction coil 32b on both the inside and the outside of the winding portion 2x in this way, the magnetic coupling of electromagnetic induction can be improved, the induction current can be made to flow easily in the conductor tube 2, and the water vapor can be increased. Heating efficiency (generating efficiency of superheated steam).

In addition, in this embodiment, as shown in FIGS. 2 and 3, in the winding portion 2 x of the conductor tube 2, the mutually facing surfaces of the adjacent portions 20 adjacent to each other span substantially the entirety of the circumferential direction. The conductive bonding portion 4 is bonded. That is, the entire spiral of the winding portion 2 x of the conductor tube 2 is provided with the joint portion 4.

Specifically, the joint portion 4 is formed by welding (hereinafter, also referred to as a joint weld portion). That is, in the winding portion 2x of the conductor tube 2, the mutually facing surfaces of the adjacent portions 20 adjacent to each other are integrally joined across the spiral as a whole (see FIG. 2). In addition, the resistivity of the material of the joint portion 4 and the resistivity of the material of the conductor tube 2 are made substantially the same. Here, it is preferable that the material of the joint portion 4 is the same as that of the conductor tube 2. Thereby, not only the resistivity can be made the same, but also the coefficient of thermal expansion can be made the same, so that the thermal stress generated when the temperature rises can be reduced. In addition, since it is important to keep the distance between the torch and the welding site at a constant feed rate during welding, it is preferable to use an automatic welding machine. In addition, since a groove is initially formed between the adjacent portions 20 of the conductor pipe 2, it is not necessary to perform a groove processing.

As shown in FIG. 3, the thickness of the joint portion 4 is equal to or greater than the thickness of the conductor tube 2. That is, the thickness of the filler formed by the welding joint as the joint portion 4 is equal to or greater than the pipe thickness of the conductor pipe 2. The joint portion 4 is housed in a recessed portion 20M formed by the adjacent portions 20 adjacent to each other. More specifically, the joint portion 4 is formed in a range capable of being accommodated in the recessed portion 20M from a contact portion 20c of the adjacent portion 20 adjacent to each other or in the vicinity thereof. That is, in the direction perpendicular to the axial direction of the spiral (the central axial direction of the winding portion 2x), the outer end portion of the conductor tube 2 is positioned further outside than the outer end portion of the joint portion 4.

In FIG. 3 and the like, the joint portion 4 is provided on both the inner surface side and the outer surface side of the winding portion 2x of the conductor tube 2. However, considering the operability of the entire joining of the winding portion 2x of the conductor tube 2, it is preferable It is noted that the joint portion 4 is provided only on the outer surface side of the winding portion 2x.

As shown in FIG. 4, although a small gap may be formed between the contact portion of the adjacent portion 20 of the wound portion 2x and the filler portion (joint welding portion 4), if the gap size is Δ, It is about 0 <Δ <several mm. For example, a conductor pipe 2 for generating 240 kg of superheated water vapor at 1200 ° C for 1 hour has a diameter of 48.3 mm and a tube thickness of 3.7 mm. When the entire winding portion 2x of the conductor tube 2 is welded and the thickness of the filler is set to 5 mm, Δ is about 2.5 mm.

In the case of the conductor tube 2 having a size that allows the degree of water vapor flow to be increased, the distance between the joint welding portion 4 and the induction coil 32 of the magnetic flux generation mechanism 3 is increased when the tube thickness and the filler thickness are equal. If the wall thickness of the conductor tube 2 is t and the thickness of the filler of the joint welded portion 4 is T, by setting T> t, the current of the joint welded portion 4 can be increased, and the amount of heat generated can be increased.

When T = t, the case where the induced voltage of the conductor tube 2 is higher than that of the joint welding portion 4 is marked with a 0 mark, and is shown in the following table.

[Table 1]

The amount of heat generation is not only related to the induced voltage, but also to the resistance values of the conductor tube 2 and the joint welding portion 4. That is, the lower the resistance value, the larger the current flowing, and the larger the amount of heat generation.

A case where the circumference of the welded joint 4 where the induced voltage is generated is larger than the wound portion 2x of the conductor tube 2 is set to "0", and a case where the circumference of the welded joint 4 where the induced voltage is generated is smaller than the wound portion 2x of the conductor tube 2 is set to "0". Set to “×” and collectively show them in the table below.

[Table 2]

When the diameter of the conductor tube 2 is set to Φ, the maximum value of the filler thickness T at the position of “0” in Table 2 is in a range of (T + Δ) <Φ / 2.

<Effects of the present embodiment>

According to the superheated water vapor generating device 100 configured as described above, the adjacent portions 20 adjacent to each other in the winding portions 2x of the conductor tube 2 are joined (the entire joining) by the joining portion 4 substantially across the circumferential direction. Concentration of stress due to thermal expansion in the case of local joining to the joint can be avoided, and the possibility of damage to the joint and the conductor tube can be reduced. In addition, since the conductor tube 2 has a circular tube shape, and a recessed portion 20M is formed between adjacent portions 20 adjacent to each other, by providing the joint portion 4 in the recessed portion 20M, the outer peripheral surface of the joint portion 4 and the conductor tube 2 can be increased. Contact area. With this configuration, it is also possible to reduce the concentration of stress on the joint.

Since the thickness T of the joint portion 4 is equal to or greater than the tube thickness t of the conductor tube 2, the resistance value of the joint portion 4 can be reduced, and the amount of heat generated can be increased by increasing the current.

In addition, since the joint portion 4 is formed by welding and has a structure in which the recessed portions 20M between the adjacent portions 20 adjacent to each other are easily filled with the molten metal material, the welding operation can be facilitated.

＜ Other modified embodiments ＞

The present invention is not limited to the embodiments described above.

For example, in the embodiment described above, the joint portion 4 is formed by joint welding, but may be formed by brazing. Further, the connection member provided separately from the conductor tube may be wound along an adjacent portion of the winding portion, and the connection member may be connected to the conductor tube 2 by welding, brazing, or the like, thereby connecting the connection member As the joint 4.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the present invention.

The technical features described in the respective embodiments (examples) of the present invention can be combined with each other to form a new technical solution.

2‧‧‧conductor tube

2x‧‧‧winding part

3‧‧‧ magnetic flux generating mechanism

4‧‧‧Joint section, joint welding section

20‧‧‧adjacent

20c‧‧‧Contact site

20M‧‧‧Concave

31‧‧‧ Iron core

32‧‧‧ Induction coil

32a‧‧‧Inside induction coil

32b‧‧‧outer induction coil

100‧‧‧ Superheated steam generating device

FIG. 1 is a cross-sectional view schematically showing a configuration of a superheated steam generating device according to the present embodiment. FIG. 2 is a partially enlarged sectional view showing a winding portion of a conductor tube according to the same embodiment. FIG. FIG. 3 is a schematic diagram showing a welded portion on the outer surface side of a conductor tube according to the same embodiment. 4 is a schematic diagram showing a positional relationship between a conductor tube and an induction coil according to the embodiment.

Claims (6)

A superheated water vapor generating device, characterized in that the superheated water vapor generating device is configured to spirally wind a circular tube-shaped housing through a magnetic flux generating mechanism provided inside or outside a winding portion of a conductor tube. The conductor tube is subjected to induction heating, thereby heating water vapor flowing in the conductor tube to generate superheated water vapor; in the winding portion of the conductor tube, opposite surfaces of an adjacent portion adjacent to each other. , The entirety of the circumferential direction is joined by a joint having conductivity; and a thickness of the joint is greater than or equal to a thickness of the conductor tube. The superheated steam generating device according to claim 1, wherein the joint portion is formed by welding. The superheated steam generating device according to claim 1, wherein a specific resistivity of a material of the joint portion is the same as a specific resistivity of a material of the conductor pipe. The superheated steam generating device according to claim 1, wherein the magnetic flux generating mechanism is provided on both the inside and the outside of the winding portion of the conductor pipe; and the joint portion is provided on the winding An outer surface side of the part. The superheated steam generating device according to claim 1, wherein the joint portion is received in a recess formed by the adjacent portions adjacent to each other. A method for manufacturing a conductor pipe, characterized in that the conductor pipe is used in a superheated water vapor generating device, and is heated by induction, thereby heating water vapor flowing in the interior to generate superheated water vapor; wound in a spiral shape The whole of a winding portion of the conductor tube in a circular tube shape, welded and joined the mutually opposing faces of an adjacent portion adjacent to each other; and a filler thickness of the welded joint was a thickness of one of the conductor tube Above the pipe thickness.