Superheated steam generating device

Abstract

To enable, for a superheated steam generator with a three-phase AC supply, improved heat efficiency and simplification and miniaturization of the generator.SOLUTION: Superheated steam generation units 100A-100C each comprise a spiral preheat conductor pipe 3 serving as a primary coil to which a single-phase alternating current voltage is applied, and disposed around a closed magnetic path core, and a spiral superheat conductor pipe 4 serving as a secondary coil, and disposed around the closed magnetic path core, the preheat conductor pipe comprising a first preheat conductor tube 31, a second preheat conductor tube 32, and a third preheat conductor tube 33 that are concentrically disposed around the closed magnetic path core, the superheat conductor pipe comprising a first superheat conductor tube 41 and a second superheat conductor tube 42 that are concentrically disposed around the closed magnetic path core and that are spirally wound in mutually opposite directions, for the conductor tubes, from the inside in a radial direction, the second preheat conductor tube, the second superheat conductor tube, the third preheat conductor tube, the first superheat conductor tube, and the first preheat conductor tube being arranged in this order.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a superheated steam generator.

Background Art

[0002] As a conventional superheated steam generator, as shown in Patent Document 1, in the case of using a three-phase AC power supply, a first conductor tube and a second conductor tube are used as primary coils, and a third conductor tube (superheating conductor tube), which is a secondary coil, is provided between the first conductor tube and the second conductor tube. In this superheated steam generator, the first conductor tube and the second conductor tube are heated by being energized, and are also heated by utilizing the heat dissipation of the third conductor tube. Therefore, heat dissipation from the third conductor tube to the outside of the device can be reduced, and the thermal efficiency can be increased.

[0003] And in this superheated steam generator, the third conductor tube has an inner tube element and an outer tube element wound spirally in opposite directions, and one axial end portion and the other axial end portion of these inner tube element and outer tube element are fluidly connected and short-circuited by a connecting tube element.

[0004] However, in the above superheated steam generator, although the heat dissipation on the radially outer side of the third conductor tube can be utilized for heating the first conductor tube, and the heat dissipation on the radially inner side of the third conductor tube can be utilized for heating the second conductor tube, the heat dissipation between the inner tube element and the outer tube element of the third conductor tube cannot be effectively utilized.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] Therefore, the present invention has been made to solve the above problems, and in a superheated steam generation device using a three-phase AC power supply, it is a main object to effectively utilize the heat dissipation of the superheated conductor tube to improve the thermal efficiency and to enable simplification and miniaturization of the superheated steam generation device.

Means for Solving the Problems

[0007] That is, the superheated steam generation device according to the present invention is a superheated steam generation device that generates heat in a conductor tube by electromagnetic induction, heats water flowing through the conductor tube, and generates superheated steam. Three superheated steam generation units are configured using three leg cores in a three-phase closed magnetic circuit core, and different-phase AC voltages are applied to the three superheated steam generation units to generate superheated steam. Each of the superheated steam generation units includes a primary coil to which a single-phase AC voltage is applied, a spiral preheating conductor tube disposed around the closed magnetic circuit core, and a secondary coil through which an induced current flows, and a spiral superheated conductor tube disposed around the closed magnetic circuit core. The preheating conductor tube has a first preheating conductor tube, a second preheating conductor tube, and a third preheating conductor tube concentrically disposed around the closed magnetic circuit core. The superheated conductor tube includes a first superheated conductor tube and a second superheated conductor tube that are concentrically disposed around the closed magnetic circuit core and wound in a spiral shape in opposite directions to each other, and a connection pipe element that fluidly connects and short-circuits one axial end portion and the other axial end portion of the first superheated conductor tube and the second superheated conductor tube. Each of the conductor tubes is arranged in the order of the second preheating conductor tube, the second superheated conductor tube, the third preheating conductor tube, the first superheated conductor tube, and the first preheating conductor tube from the radially inner side, and is connected in series in the order of the first preheating conductor tube, the second preheating conductor tube, the third preheating conductor tube, and the superheated conductor tube. Water or steam is introduced from an introduction port provided in the first preheating conductor tube, and superheated steam is led out from a lead-out port provided in the superheated conductor tube through the second preheating conductor tube and the third preheating conductor tube.

[0008] According to such a superheated steam generating device, since different-phase alternating voltages are applied to the three superheated steam generating units to generate superheated steam, the superheated steam generating capacity can be improved in a superheated steam generating device using a three-phase AC power supply. And, since the first preheating conductor tube and the second preheating conductor tube are used as the primary coil, and a superheating conductor tube which is a secondary coil is provided between the first preheating conductor tube and the second preheating conductor tube, the first preheating conductor tube and the second preheating conductor tube are heated by energization, and are also heated by utilizing the heat radiation of the superheating conductor tube. Therefore, the heat radiation from the superheating conductor tube to the outside of the device can be reduced, and the thermal efficiency can be increased. In particular, in the present invention, since the third preheating conductor tube is provided as the primary coil, and the third preheating conductor tube is provided between the first superheating conductor tube and the second superheating conductor tube of the superheating conductor tube, it is heated by effectively utilizing the heat radiation between the first superheating conductor tube and the second superheating conductor tube, and the thermal efficiency can be further increased. Here, the first preheating conductor tube, the second preheating conductor tube, and the third preheating conductor tube forming the primary coil can adjust the heat generation ratio, the heat transfer area ratio to the fluid, and the fluid flow velocity ratio by setting the respective number of turns, the energized cross-sectional area of the conductor tube, and the flow aperture diameter of the conductor tube. Also, they are connected in series in the order of the first preheating conductor tube, the second preheating conductor tube, the third preheating conductor tube, and the superheating conductor tube. Water or steam is introduced from the introduction port provided in the first preheating conductor tube, and superheated steam is led out from the lead-out port provided in the superheating conductor tube via the second preheating conductor tube and the third preheating conductor tube. Therefore, the superheated steam generating device can be simplified and miniaturized. Furthermore, since the superheating conductor tube is composed of a first superheating conductor tube, a second superheating conductor tube, and a connecting pipe element, there is no need to provide an electrical connection member separately from the conductor tube, and a short-circuit circuit can be formed by the configuration of the conductor tube itself. Also, the connecting pipe element connects the axial-direction one ends of the respective pipe elements to each other and the axial-direction other ends to each other, and the connection structure for forming the short-circuit circuit can be simplified.

[0009] In the superheated conductor tube, the side of the lead-out port becomes the hottest, and the heat dissipation from this part is the largest. In order to effectively utilize the heat dissipation from the lead-out port side, the lead-out port is formed at one axial end of the superheated conductor tube, and it is desirable that water or steam be introduced from one axial end on the same side as the lead-out port of the third preheating conductor tube. With this configuration, relatively low-temperature water or steam flowing into the third heat conductor tube can be efficiently preheated.

[0010] Also, in order to efficiently preheat the water or steam flowing into the introduction port, it is desirable that the introduction port be formed at one axial end on the same side as the lead-out port in the first preheating conductor tube.

[0011] In order to prevent the heat dissipation of the superheated conductor tube from leaking to the outside of the device and to safely realize the heating of each preheating conductor tube by the heat dissipation of the superheated conductor tube, it is desirable that heat insulating materials be filled between the first preheating conductor tube and the first superheated conductor tube, between the first superheated conductor tube and the third preheating conductor tube, between the third preheating conductor tube and the second superheated conductor tube, and between the second superheated conductor tube and the second preheating conductor tube. With this configuration, the heat transfer ratios from the first and second superheated conductor tubes to the first preheating conductor tube, the second preheating conductor tube, and the third preheating conductor tube can be adjusted by the thicknesses of the heat insulating materials between the first preheating conductor tube and the first superheated conductor tube, between the second preheating conductor tube and the second superheated conductor tube, and between the third preheating conductor tube and the first and second superheated conductor tubes.

[0012] As a specific connection configuration of each pipe, the first preheating conductor tube, the second preheating conductor tube, and the third preheating conductor tube are single-layer wound, the introduction port is formed at one axial end of the first preheating conductor tube, the other axial end of the first preheating conductor tube is connected to the other axial end of the second preheating conductor tube, and it is conceivable that one axial end of the second preheating conductor tube is connected to one axial end of the third preheating conductor tube. In this configuration, it is desirable that the AC power source for applying the AC voltage is connected to one axial end of the first preheating conductor tube and the other axial end of the third preheating conductor tube.

Advantages of the Invention

[0013] According to the present invention configured as described above, in a superheated steam generation device using a three-phase AC power source, it is possible to improve the thermal efficiency by effectively utilizing the heat dissipation of the superheating conductor tube, and to simplify and miniaturize the superheated steam generation device.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0015] An embodiment of a superheated steam generation device according to the present invention will be described below with reference to the drawings.

[0016] <1. Device Configuration> The superheated steam generation device 100 according to this embodiment uses a three-phase AC power supply, generates heat in a conductor tube by electromagnetic induction, heats the water flowing through the conductor tube, and generates superheated steam. In addition, as the superheated steam generation device 100, for example, a device that heats saturated steam generated externally to generate superheated steam may also be used.

[0017] Specifically, as shown in FIGS. 1 to 3, the superheated steam generation device 100 uses three leg cores 21, 22, and 23 in a three-phase closed magnetic circuit core 2 to form three superheated steam generation units 100A, 100B, and 100C, and applies AC voltages of different phases to the three superheated steam generation units 100A, 100B, and 100C to generate superheated steam.

[0018] Here, as shown in FIG. 4, the three-phase closed magnetic circuit core 2 includes three leg cores 21, 22, and 23, an upper yoke core 24 that connects one end faces (the upper end faces in FIG. 4) of the three leg cores 21, 22, and 23, and a lower yoke core 25 that connects the other end faces (the lower end faces in FIG. 4) of the three leg cores 21, 22, and 23. Here, the three leg cores 21, 22, and 23 are located at the vertices of a triangle, and the yoke cores 24 and 25 connecting them form a Y shape. In addition, each leg core 21, 22, and 23 is a laminated core. Note that the leg cores 21, 22, and 23 are, for example, cylindrical involute cores formed by radially laminating a large number of magnetic steel sheets having a curved portion curved in an involute shape into a cylindrical shape. Note that each leg core 21, 22, and 23 may also be a cylindrical core formed by radially laminating a large number of flat magnetic steel sheets into a cylindrical shape.

[0019] As shown in FIGS. 1 to 3, each of the superheated steam generation units 100A, 100B, and 100C includes the leg cores 21, 22, and 23, a primary coil to which a single-phase AC voltage is applied, and which is arranged around the closed magnetic circuit core 2 in a spiral (coil-like) preheating conductor tube 3, and a secondary coil through which an induced current flows, and which is arranged around the closed magnetic circuit core 2 in a spiral (coil-like) superheating conductor tube 4. Since the three leg cores 21, 22, and 23 are located at the vertices of a triangle, the three superheated steam generation units 100A, 100B, and 100C are also located at the vertices of a triangle (see FIG. 3).

[0020] The preheating conductor tube 3 has a first preheating conductor tube 31, a second preheating conductor tube 32, and a third preheating conductor tube 33 that are concentrically arranged around the closed magnetic circuit core 2.

[0021] The first to third preheating conductor tubes 31, 32, and 33 are each single-layer wound, with the first preheating conductor tube 31 arranged on the outermost side in the radial direction, the second preheating conductor tube 32 arranged on the innermost side in the radial direction, and the third preheating conductor tube 33 arranged between the first preheating conductor tube 31 and the second preheating conductor tube 32.

[0022] An introduction port P1 is connected to one axial end of the first preheating conductor tube 31, and the other axial end of the first preheating conductor tube 31 is connected to the other axial end of the second preheating conductor tube 32. Also, one axial end of the second preheating conductor tube 32 is connected to one axial end of the third preheating conductor tube 33. A flow rate adjustment valve 5 for adjusting the flow rate of water flowing into the first preheating conductor tube 31 is provided at or near the introduction port P1.

[0023] Furthermore, an AC power supply (not shown) for applying an AC voltage is connected to a power supply terminal 61 provided at or near an introduction port P1 connected to one axial end of the first preheating conductor tube 31, as shown in FIGS. 5 and 6, and a power supply terminal 62 provided at the other axial end of the third preheating conductor tube 33. Specifically, a single-phase AC voltage is applied to a U terminal provided on the first preheating conductor tube 31 and a V terminal provided on the third preheating conductor tube 33 of the first superheated steam generation unit 100A, and a single-phase AC voltage is applied to a V terminal provided on the first preheating conductor tube 31 and a W terminal provided on the third preheating conductor tube 33 of the second superheated steam generation unit 100B, and a single-phase AC voltage is applied to a W terminal provided on the first preheating conductor tube 31 and a U terminal provided on the third preheating conductor tube 33 of the third superheated steam generation unit 100C.

[0024] And, as shown in FIG. 2, the first to third preheating conductor tubes 31, 32, 33 are configured such that the wound portions of the respective conductor tubes 31, 32, 33 do not short-circuit each other. Note that the wound portion refers to one turn of the helix. Specifically, the respective conductor tubes 31 to 33 are wound with a gap such that the outer circumferential surfaces of the respective wound portions do not contact each other, so that the wound portions of the respective conductor tubes 31 to 33 do not short-circuit each other. In addition, the respective conductor tubes 31 to 33 may be configured such that the wound portions of the respective conductor tubes 31 to 33 do not short-circuit each other by performing insulation treatment such as winding an insulator (not shown) around the outer circumferential surface thereof.

[0025] As shown in FIG. 7, the superheating conductor tube 4 includes a first superheating conductor tube 41 and a second superheating conductor tube 42 wound in a spiral shape in opposite directions to each other, and connection tube elements 43, 44 that fluidly connect and short-circuit one axial end and the other axial end of the first superheating conductor tube 41 and the second superheating conductor tube 42. The first superheating conductor tube 41 and the second superheating conductor tube 42 have a gap formed in the radial direction when viewed from the axial direction.

[0026] The first superheating conductor tube 41 and the second superheating conductor tube 42 are arranged between the first preheating conductor tube 31 and the second preheating conductor tube 32, and a third preheating conductor tube 33 is arranged between the first superheating conductor tube 41 and the second superheating conductor tube 42. Also, the other axial end of the superheating conductor tube 4 is connected to the other axial end of the third preheating conductor tube 33, and a lead-out port P2 is provided at one axial end of the superheating conductor tube 4.

[0027] In this embodiment, as shown in FIGS. 1 and 5, the lead-out ports P2 of the three superheated steam generation units 100A, 100B, and 100C are each connected to one superheated steam discharge port P3, and the superheated steam generated by each of the superheated steam generation units 100A, 100B, and 100C is configured to merge and be discharged. A temperature sensor 7 for controlling the temperature of the superheated steam is provided at or near the superheated steam discharge port P3.

[0028] With such a configuration, the conductor tubes 31 to 33, 41, and 42 are arranged in the order of the second preheating conductor tube 32, the second superheating conductor tube 42, the third preheating conductor tube 33, the first superheating conductor tube 41, and the first preheating conductor tube 31 from the inner side in the radial direction, and are connected in series in the order of the first preheating conductor tube 31, the second preheating conductor tube 32, the third preheating conductor tube 33, and the superheating conductor tube 4.

[0029] Also, a lead-out port P2 is provided in one connection pipe element 43, and the other axial end of the third preheating conductor tube 33 is connected to the other connection pipe element 44. With this configuration, the fluid flowing in from the other connection pipe element 44 branches and flows into the first superheating conductor tube 41 and the second superheating conductor tube 42 by the connection pipe element 44, and the fluid that has flowed through the first superheating conductor tube 41 and the second superheating conductor tube 42 merges in the connection pipe element 43 and flows out from the lead-out port P2.

[0030] Further, the superheat conductor tube 4 connected in this way is configured such that the first superheat conductor tube 41 and the second superheat conductor tube 42 are electrically connected in parallel by connection tube elements 43 and 44. Then, due to the magnetic flux generated by the first to third preheat conductor tubes 31, 32, and 33 which are primary coils, a closed circuit is formed by the first superheat conductor tube 41 and the second superheat conductor tube 42, and a short-circuit current flows. That is, a short-circuit current flows from one axial end portion to the other axial end portion in the first superheat conductor tube 41, and a short-circuit current flows from the other axial end portion to the one axial end portion in the second superheat conductor tube 42.

[0031] Also, in each of the superheated steam generation units 100A, 100B, and 100C of the present embodiment, as shown in FIGS. 1 to 3, between the first preheat conductor tube 31 and the first superheat conductor tube 41, between the first superheat conductor tube 41 and the third preheat conductor tube 33, between the third preheat conductor tube 33 and the second superheat conductor tube 42, and between the second superheat conductor tube 42 and the second preheat conductor tube 32, a heat insulating material 8 is filled. This heat insulating material 8 is also filled in the gaps between the wound portions of the respective preheat conductor tubes 31 to 33, and is also filled in the gaps between the wound portions of the respective superheat conductor tubes 41 and 42. In the present embodiment, a casing 9 is provided on the outer periphery of the first preheat conductor tube 31, and a heat insulating material 8 is provided between the first preheat conductor tube 31 and the casing 9. In addition, a heat insulating material 8 may be filled between the leg cores 21 to 23 of the closed magnetic circuit core 2 and the second preheat conductor tube 32.

[0032] In the superheated steam generation device 100 of the present embodiment configured in this way, when AC voltages of different phases are applied to the respective superheated steam generation units 100A, 100B, and 100C, an alternating current flows through the first to third preheat conductor tubes 31, 32, and 33 in each superheated steam generation unit, and a magnetic flux flows through the leg cores 21 to 23. Due to the magnetic flux, a short-circuit current flows through the first superheat conductor tube 41, the second superheat conductor tube 42, and the connection tube elements 43 and 44, and the superheat conductor tube 4 generates Joule heat. Also, the first to third preheat conductor tubes 31, 32, and 33 generate Joule heat due to energization when an AC voltage is applied, and are heated by heat transfer from the superheat conductor tube 4.

[0033] As a result, as shown in FIGS. 5 and 6, the water introduced from the introduction port P1 of the first preheating conductor tube 31 flows through the first to third preheating conductor tubes 31, 32, and 33, and is heated by the first to third preheating conductor tubes 31, 32, and 33 to become high-temperature water or saturated steam. Then, the high-temperature water or saturated steam flowing into the superheating conductor tube 4 from the third preheating conductor tube 33 is heated by the superheating conductor tube 4 to become superheated steam, which is led out from the lead-out port P2, and then merged and discharged from the superheated steam discharge port P3.

[0034] <2. Effects of this Embodiment> According to the superheated steam generation device 100 configured as described above, since different-phase AC voltages are applied to the three superheated steam generation units 100A, 100B, and 100C to generate superheated steam, the superheated steam generation capacity in the superheated steam generation device 100 using a three-phase AC power supply can be improved.

[0035] And, since the first preheating conductor tube 31 and the second preheating conductor tube 32 are used as the primary coil, and the superheating conductor tube 4, which is the secondary coil, is provided between the first preheating conductor tube 31 and the second preheating conductor tube 32, the first preheating conductor tube 31 and the second preheating conductor tube 32 are energized and heated, and are also heated by utilizing the heat radiation of the superheating conductor tube 4. Therefore, the heat radiation from the superheating conductor tube 4 to the outside of the device can be reduced, and the thermal efficiency can be increased.

[0036] In particular, in the present invention, since the third preheating conductor tube 33 is provided as the primary coil between the first superheating conductor tube 41 and the second superheating conductor tube 42 that constitute the superheating conductor tube 4, it is heated by effectively utilizing the heat radiation between the first superheating conductor tube 41 and the second superheating conductor tube 42, and the thermal efficiency can be further increased.

[0037] Here, the first preheating conductor tube 31, the second preheating conductor tube 32, and the third preheating conductor tube 33 that form the primary coil can adjust the heat generation ratio, the heat transfer area ratio to the fluid, and the fluid flow velocity ratio by setting the respective number of turns, the energized cross-sectional area of the conductor tube, and the flow aperture diameter of the conductor tube.

[0038] Further, they are connected in series in the order of the first preheating conductor tube 31, the second preheating conductor tube 32, the third preheating conductor tube 33, and the superheating conductor tube 4. Water or steam is introduced from the introduction port P1 provided in the first preheating conductor tube 31, and superheated steam is led out from the lead-out port P2 provided in the superheating conductor tube 4 via the second preheating conductor tube 32 and the third preheating conductor tube 33. Therefore, the superheated steam generator 100 can be simplified and miniaturized.

[0039] Furthermore, since the superheating conductor tube 4 is composed of a first superheating conductor tube 41, a second superheating conductor tube 42, and connecting pipe elements 43, 44, there is no need to provide an electrical connection member separately from the conductor tube, and a short-circuit circuit can be formed by the configuration of the conductor tube itself. In addition, the connecting pipe elements 43, 44 connect the axial one ends of the respective superheating conductor tubes 41, 42 and connect the axial other ends, and the connection structure for forming a short-circuit circuit can be simplified. Also, since the superheating conductor tube 4 has the first superheating conductor tube 41 and the second superheating conductor tube 42, the contact area (heat exchange area) with the fluid can be increased, and the heating efficiency of the fluid can be improved.

[0040] By forming the superheating conductor tube 4 into a multi-turn secondary coil, the exciting current can be reduced and the leakage impedance can be decreased. Therefore, the cross-sectional area of the closed magnetic circuit core 2 can be reduced, the amount of iron core used can be decreased, the iron loss can be reduced, and the thermal efficiency can be increased. Also, since the Y-shaped yoke cores 24, 25 are used to combine the three superheated steam generation units 100A to 100C to form the superheated steam generator 100, an apparatus with a large superheated steam generation capacity can be realized while balancing the three-phase current.

[0041] <3. Modified Embodiment of the Present Invention> Note that the present invention is not limited to the above-described embodiment. For example, in the above embodiment, the first to third preheating conductor tubes 31, 32, 33 are each single-layer wound, but at least one of the first to third preheating conductor tubes 31, 32, 33 may be multi-layer wound such as double-layer wound or more.

[0042] Also, in the above embodiment, the winding directions of the first superheating conductor tube 41 and the second superheating conductor tube 42 were opposite to each other, but the winding directions of the first superheating conductor tube 41 and the second superheating conductor tube 42 may be the same. In this case, one axial end of the first superheating conductor tube 41 and the other axial end of the second superheating conductor tube 42 are connected by a connecting tube element 43, and the other axial end of the first superheating conductor tube 41 and one axial end of the second superheating conductor tube 42 are connected by a connecting tube element 44.

[0043] Furthermore, the superheating conductor tube 4 in the above embodiment has a double-tube structure, but it may have a quadruple tube or an even number of tube elements of more than that. In this case, each two tube elements are connected by a connecting tube element. For example, a configuration in which a plurality of the superheating conductor tubes 4 in the above embodiment are arranged concentrically can be considered.

[0044] In the above embodiment, the three lead-out ports P2 are connected to one superheated steam discharge port P3, but the superheated steam may be discharged independently from the three lead-out ports P2 without providing the superheated steam discharge port P3.

[0045] In the above embodiment, an apparatus for heating water or steam as a fluid has been described, but it may be one for heating other liquids or gases.

[0046] Needless to say, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the spirit thereof.

Explanation of Reference Numerals

[0047] 100 ··· Superheated steam generator 100A ··· First superheated steam generation unit 100B ··· Second superheated steam generation unit 100C ··· Third superheated steam generation unit 2 ··· Closed magnetic circuit core 21, 22, 23 ··· Leg cores 3 ··· Preheating conductor tube 31 ··· First preheating conductor tube 32 ··· Second preheating conductor tube 33 ··· Third preheating conductor tube 4 ··· Superheating conductor tube 41 ··· First superheating conductor tube 42 ··· Second superheating conductor tube 43, 44 ··· Connection tube elements P1 ··· Inlet port P2 ··· Outlet port 8 ··· Heat insulator

Claims

1. A superheated steam generator that generates superheated steam by heating water flowing through a conductor pipe by electromagnetic induction, Three superheated steam generating units are configured using three leg cores in a three-phase closed magnetic circuit core, and superheated steam is generated by applying AC voltages of different phases to the three superheated steam generating units, Each of the superheated steam generating units comprises: a primary coil to which a one-phase AC voltage is applied, the primary coil being a spiral preheating conductor tube disposed around the closed magnetic circuit iron core; a secondary coil through which an induced current flows, and a spiral heating conductor tube disposed around the closed magnetic circuit core; the preheating conductor tube includes a first preheating conductor tube, a second preheating conductor tube, and a third preheating conductor tube, which are concentrically arranged around the closed magnetic circuit core; the overheat conductor tube includes a first overheat conductor tube and a second overheat conductor tube that are concentrically arranged around the closed magnetic circuit core and wound spirally in opposite directions to each other, and a connecting pipe element that fluidly connects one axial end portion and the other axial end portion of the first overheat conductor tube and the second overheat conductor tube to each other and short-circuits them; The conductor tubes are arranged in the order of the second preheating conductor tube, the second overheating conductor tube, the third preheating conductor tube, the first overheating conductor tube, and the first preheating conductor tube from the radially inner side, and are connected in series in the order of the first preheating conductor tube, the second preheating conductor tube, the third preheating conductor tube, and the overheating conductor tube, A superheated steam generating device that introduces water or steam from an inlet port provided in the first preheating conductor tube, and discharges superheated steam from an outlet port provided in the superheating conductor tube through the second preheating conductor tube and the third preheating conductor tube.

2. The outlet port is formed at one axial end of the heating conductor tube, The superheated steam generating apparatus according to claim 1 , wherein water or steam is introduced into the third preheating conductor tube from one end in the axial direction on the same side as the outlet port.

3. 3. The superheated steam generator according to claim 1, wherein the inlet port is formed at one axial end of the first preheating conductor tube on the same side as the outlet port.

4. The superheated steam generating device according to any one of claims 1 to 3, wherein a heat insulating material is filled between the first preheating conductor tube and the first superheating conductor tube, between the first superheating conductor tube and the third preheating conductor tube, between the third preheating conductor tube and the second superheating conductor tube, and between the second superheating conductor tube and the second preheating conductor tube.

5. The first preheating conductor tube, the second preheating conductor tube, and the third preheating conductor tube are single-layer wound, The introduction port is formed at one axial end of the first preheating conductor tube, The other axial end of the first preheating conductor tube is connected to the other axial end of the second preheating conductor tube, One axial end of the second preheating conductor tube is connected to one axial end of the third preheating conductor tube, The AC power source for applying the AC voltage is connected to one axial end of the first preheating conductor tube and the other axial end of the third preheating conductor tube. The superheated steam generating device according to any one of claims 1 to 4.

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