Superheated steam generator

Abstract

To provide a superheated steam generation device using a three-phase AC power supply that effectively uses radiation of heat from a superheated conductor tube to improve thermal efficiency and reduces the influence that the superheated conductor tube is cooled by water or steam introduced from an introduction port.SOLUTION: A pre-heating conductor tube 3 has a first pre-heating conductor tube 31 and a second pre-heating conductor tube 32 that are arranged concentrically around a closed magnetic circuit iron core 2. The conductor tubes 31, 32, 4 are arranged in the order of the second pre-heating conductor tube 32, a superheated conductor tube 4, and the first pre-heating conductor tube 31 from the inside in a radial direction, and are connected in series in the order of the first pre-heating conductor tube 31, the second pre-heating conductor tube 32, and the superheated conductor tube 4. The second pre-heating conductor tube 32 has a spiral short circuit part 32X short-circuited in an axial direction. A superheated steam generation device introduces water or steam from an introduction port P1 provided in the first pre-heating conductor tube 31, and derives superheated steam from a derivation port P2 provided in the superheated conductor tube 4 through the second pre-heating conductor tube 32.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present invention relates to an apparatus for generating superheated steam using a three-phase AC power supply. 【Background Art】 【0002】 As a conventional apparatus for generating superheated steam using a three-phase AC power supply, as shown in Patent Document 1, three superheated steam generating 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 generating units to generate superheated steam. 【0003】 And each superheated steam generating unit is considered to use a first conductor tube and a second conductor tube 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. Specifically, an introduction port of the first conductor tube into which water is introduced is provided on one end side in the axial direction, and a discharge port of the third conductor tube from which superheated steam is discharged is provided on the other end side in the axial direction. Also, the second conductor tube and the third conductor tube are connected to each other at one end side in the axial direction. 【0004】 In this superheated steam generating unit, the first conductor tube and the second conductor tube are heated by energization, and are also heated by utilizing the heat radiation of the third conductor tube, so that the heat radiation from the third conductor tube to the outside of the apparatus can be reduced, and the thermal efficiency can be increased. 【0005】 However, in the above configuration, one end portion in the axial direction of the third conductor tube is cooled by the water introduced from the introduction port of the first conductor tube, so that the preheated water or steam flowing into the third conductor tube is cooled. Then, the time required to superheat the superheated steam to a desired temperature becomes long, and there is a problem that the temperature of the superheated steam generated changes due to a change in the amount of water. 【Prior Art Documents】 【Patent Documents】 【0006】 [Patent Document 1] Japanese Patent Publication No. 2021-44200 [Overview of the project] [Problems that the invention aims to solve] 【0007】 Therefore, the present invention was made to solve the above problems, and its main objective is to improve thermal efficiency by effectively utilizing the heat dissipation of the superheated conductor tube in a superheated steam generator using a three-phase AC power supply, and to reduce the effect of cooling the superheated conductor tube by water or steam introduced from the introduction port. [Means for solving the problem] 【0008】 In other words, the superheated steam generating apparatus according to the present invention is a superheated steam generating apparatus that generates superheated steam by heating a conductive pipe by electromagnetic induction and heating the water flowing through the conductive pipe, and uses three leg cores in a three-phase closed magnetic circuit core to constitute three superheated steam generating units, and generates superheated steam by applying AC voltages of different phases to the three superheated steam generating units, and each of the superheated steam generating units is a primary coil to which an AC voltage is applied, a spiral preheating conductive pipe arranged around the leg core, and a secondary coil through which an induced current flows, a spiral superheating conductive pipe arranged around the leg core The preheating conductor tube comprises a first preheating conductor tube and a second preheating conductor tube arranged concentrically around the leg core, the conductor tubes being arranged in the order of the second preheating conductor tube, the superheating conductor tube and the first preheating conductor tube from the radially inner side, and connected in series in the order of the first preheating conductor tube, the second preheating conductor tube and the superheating conductor tube, the second preheating conductor tube having a short-circuit section that is short-circuited in the spiral axial direction, and water or steam is introduced from an introduction port provided in the first preheating conductor tube, and superheated steam is discharged from an outlet provided in the superheating conductor tube via the second preheating conductor tube. 【0009】 With this type of superheated steam generator, superheated steam is generated by applying AC voltages of different phases to three superheated steam generation units, thus improving the superheated steam generation capacity of a superheated steam generator using a three-phase AC power supply. Furthermore, by using a first preheating conductor tube and a second preheating conductor tube as the primary coil, and by providing a superheating conductor tube as a secondary coil between the first and second preheating conductor tubes, the first and second preheating conductor tubes are heated by current, and are also heated by utilizing the heat dissipation from the superheating conductor tube. This reduces heat dissipation from the superheating conductor tube to the outside of the device, thereby increasing thermal efficiency. In particular, in this invention, since the second preheating conductor tube has a short-circuit section that is short-circuited in the spiral axial direction, the preheated water or saturated steam flowing into the superheating conductor tube can be heated by Joule heating due to the short-circuit current. As a result, the effect of cooling the superheating conductor tube by the water or steam introduced from the introduction port is reduced, and the time required to heat the superheated steam to the desired temperature can be shortened. Furthermore, in response to temperature changes of superheated steam due to changes in the amount of water, the superheated steam can be heated to the desired temperature regardless of changes in the amount of water. Here, the first and second preheating conductor tubes forming the primary coil can have their heat generation ratio, heat transfer area ratio to the fluid, and fluid velocity ratio adjusted by setting the number of turns, the current-carrying cross-sectional area of ​​the conductor tubes, and the diameter of the flow holes in the conductor tubes. Furthermore, the first preheating conductor pipe, the second preheating conductor pipe, and the superheating conductor pipe are connected in series in that order. Water or steam is introduced from the inlet port provided in the first preheating conductor pipe, and superheated steam is discharged from the outlet port provided in the superheating conductor pipe via the second preheating conductor pipe, thus simplifying and miniaturizing the superheating steam generator. Here, since the temperature of the water or saturated steam flowing into the superheating conductor pipe is raised to a high temperature by the short-circuit section, it becomes possible to shorten the length of the superheating conductor pipe, which also enables miniaturization of the superheating steam generator. 【0010】 In order to enhance the effects of the present invention, it is desirable that the introduction port is provided at one axial end of the first preheating conductor tube and the outlet port is provided at the other axial end of the superheating conductor tube. In this configuration, since the inlet and outlet ports are located on opposite sides in the axial direction, the temperature influence of the water introduced from the inlet port on the superheated steam discharged from the outlet port can be reduced. Although one axial end of the superheated conductor tube is cooled by the water introduced from the inlet port, water heated by the short circuit or saturated steam is introduced to the other axial end of the superheated conductor tube, which allows for a reduction in superheating time and suppresses temperature changes of superheated steam due to changes in water volume. 【0011】 The axial end of the second preheating conductor tube and the axial end of the superheating conductor tube are connected, and it is preferable that the short-circuit portion is provided on the axial end side of the second preheating conductor tube. With this configuration, the water or saturated steam flowing through the second preheating conductor tube can be heated by the short-circuit just before it flows into one axial end of the superheating conductor tube, thus making the heating effect by the short-circuit more pronounced. 【0012】 Preferably, the superheated conductor tube comprises a first superheated conductor tube and a second superheated conductor tube arranged concentrically around the closed magnetic circuit core and wound spirally in opposite directions, and a connecting tube element that fluidly connects the axial ends of the first superheated conductor tube and the axial ends of the second superheated conductor tube and short-circuits them. With this configuration, there is no need to provide electrical connection members separately from the conducting pipe, and a short circuit can be formed by the structure of the conducting pipe itself. Furthermore, since the connecting pipe elements connect one axial end of each pipe element to the other axial end, the connection structure for forming a short circuit can be simplified. [Effects 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 supply, the heat dissipation of the superheated conductor tube is effectively utilized to improve the thermal efficiency, and the influence of cooling the superheated conductor tube by water or steam introduced from the introduction port can be reduced. 【Brief Description of the Drawings】 【0014】 [Figure 1] FIG. 1 is a cross-sectional view schematically showing the configuration of a superheated steam generation device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a cross-sectional view schematically showing the arrangement in the radial direction of the superheated steam generation device of the embodiment. [Figure 3] FIG. 3 is a view showing the coil connection and the flow of fluid of the embodiment. [Figure 4] FIG. 4 is a front view showing the configuration of the closed magnetic circuit core of the embodiment and a plan view showing the yoke core. [Figure 5] FIG. 5 is a side view schematically showing the configuration of the superheated conductor tube of the embodiment. 【Embodiments for Carrying Out the Invention】 【0015】 Hereinafter, an embodiment of a superheated steam generation device according to the present invention will be described with reference to the drawings. 【0016】 <1. Device Configuration> The superheated steam generation device 100 according to the present embodiment uses a three-phase AC power supply, generates heat in a conductor tube by electromagnetic induction, heats 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 be used. 【0017】 Specifically, as shown in FIGS. 1 to 3, the superheated steam generator 100 uses three leg cores 21, 22, and 23 in the three-phase closed magnetic 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 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 that connect them form a Y shape. Each leg core 21, 22, and 23 is formed by stacking flat silicon steel sheets into a cylindrical shape. Each leg core 21, 22, and 23 may also be formed by radially laminating a number of magnetic steel sheets having a curved portion curved in an involute shape into a cylindrical shape. 【0019】 As shown in FIGS. 1 and 2, each of the superheated steam generation units 100A, 100B, and 100C includes leg cores 21, 22, and 23, a primary coil to which a single-phase AC voltage is applied, a spiral (coil-shaped) preheating conductor tube 3 disposed around the leg cores 21, 22, and 23, a secondary coil through which an induced current flows, and a spiral (coil-shaped) superheating conductor tube 4 disposed around the leg cores 21, 22, and 23. 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. 2). 【0020】 [[ID=1@]] The preheating conductor tube 3 has a first preheating conductor tube 31 and a second preheating conductor tube 32 that are concentrically disposed around the closed magnetic core 2. These first preheating conductor tube 31 and second preheating conductor tube 32 are wound in a spiral shape. 【0021】 The first and second preheating conductor tubes 31 and 32 are each single-layer wound, with the first preheating conductor tube 31 positioned on the outermost radial side and the second preheating conductor tube 32 positioned on the innermost radial side. 【0022】 An inlet port P1 is provided at one axial end of the first preheating conductor pipe 31, and the other axial end of the first preheating conductor pipe 31 is connected to the other axial end of the second preheating conductor pipe 32. Furthermore, one axial end of the second preheating conductor pipe 32 is connected to one axial end of the superheating conductor pipe 4. A flow rate adjustment valve 5 for adjusting the flow rate of water flowing into the first conductor pipe 31 is provided at or near the inlet port P1. 【0023】 Furthermore, the AC voltage of each phase of the three-phase AC power supply (not shown) is connected to a power supply terminal 61 provided at one axial end of the first preheating conductor pipe 31 and a power supply terminal 62 provided at one axial end of the second preheating conductor pipe 32. Specifically, a one-phase AC voltage is applied to the U terminal provided on the first preheating conductor pipe 31 and the V terminal provided on the second preheating conductor pipe 32 of the first superheated steam generation unit 100A, a one-phase AC voltage is applied to the V terminal provided on the first preheating conductor pipe 31 and the W terminal provided on the second preheating conductor pipe 32 of the second superheated steam generation unit 100B, and a one-phase AC voltage is applied to the W terminal provided on the first preheating conductor pipe 31 and the U terminal provided on the second preheating conductor pipe 32 of the third superheated steam generation unit 100C. 【0024】 Furthermore, the first preheating conductor tube 31 is configured so that the wound portions of the conductor tube 31 do not short-circuit with each other. Note that a wound portion refers to a single spiral turn. Specifically, the conductor tube 31 is configured so that the wound portions of the conductor tube 31 do not short-circuit with each other by leaving gaps between them so that the outer circumferential surfaces of each wound portion do not come into contact with each other. In addition, the first preheating conductor tube 31 may be configured so that the wound portions do not short-circuit with each other by applying an insulating treatment such as winding an insulator (not shown) around its outer circumferential surface. 【0025】 Furthermore, as shown in Figures 1 and 3, the second preheating conductor tube 32 has a short-circuit section 32X where the wound portions of the conductor tube 32 are short-circuited to each other. Note that the wound portions of the second preheating conductor tube 32 other than the short-circuit section 32X are configured not to short-circuit to each other. In addition, the wound portions of the second preheating conductor tube 32 other than the short-circuit section 32X may be configured not to short-circuit to each other by applying insulating treatment such as winding an insulator (not shown) around their outer circumferential surface. 【0026】 Specifically, the short-circuit section 32X is formed by short-circuiting the wound portion of the conductor pipe 32 in the spiral axial direction. Here, the short-circuit section 32X may be formed by connecting the wound portions of the conductor pipe 32 by welding or other joining, or by connecting an electrical connection member spanning the wound portions to each wound portion by welding or other joining. Furthermore, the short-circuit section 32X is formed by short-circuiting two or more wound portions. Furthermore, the short-circuit section 32X is provided on the axial end side of the second preheating conductor pipe 32. In this embodiment, the short-circuit section 32X is formed to include the outermost wound portion on the axial end side of the second preheating conductor pipe 32. 【0027】 As shown in Figure 5, the superheated conductor tube 4 includes a first superheated conductor tube 41 and a second superheated conductor tube 42 that are spirally wound in opposite directions, and first and second connecting tube elements 43 and 44 that fluidly connect the axial ends of the first superheated conductor tube 41 and the second superheated conductor tube 42 to each other and short-circuit them. The first superheated conductor tube 41 and the second superheated conductor tube 42 have a gap formed in the radial direction when viewed from the axial direction. 【0028】 The first superheated conductor tube 41 and the second superheated conductor tube 42 are positioned between the first preheated conductor tube 31 and the second preheated conductor tube 32. In addition, one axial end of the superheated conductor tube 4 is connected to one axial end of the second preheated conductor tube 32, and an outlet port P2 is provided at the other axial end of the superheated conductor tube 4. 【0029】 In this configuration, the conductor tubes 31, 32, 41, and 42 are arranged in the order of second preheating conductor tube 32, second superheating conductor tube 42, first superheating conductor tube 41, and first preheating conductor tube 31 from the radial inside, and are connected in series in the order of first preheating conductor tube 31, second preheating conductor tube 32, and superheating conductor tube 4. 【0030】 Furthermore, one axial end of the second preheating conductor pipe 32 is connected to the first connecting pipe element 43, and an outlet port P2 is provided in the second connecting pipe element 44. With this configuration, the fluid flowing in from the first connecting pipe element 43 branches off into the first superheating conductor pipe 41 and the second superheating conductor pipe 42 by the connecting pipe element 43, and the fluids that have flowed through the first superheating conductor pipe 41 and the second superheating conductor pipe 42 merge at the second connecting pipe element 44 and flow out from the outlet port P2. 【0031】 Furthermore, the superheated conductor tubes 4 connected in this manner are configured such that the first superheated conductor tube 41 and the second superheated conductor tube 42 are electrically connected in parallel by connecting tube elements 43 and 44. Then, the magnetic flux generated by the first and second preheated conductor tubes 31 and 32, which are primary coils, forms a closed circuit between the first superheated conductor tube 41 and the second superheated conductor tube 42, causing a short-circuit current to flow. In other words, a short-circuit current flows through the first superheated conductor tube 41 from one axial end to the other axial end, and a short-circuit current flows through the second superheated conductor tube 42 from the other axial end to the one axial end. 【0032】 Furthermore, in this embodiment, as shown in Figures 1 and 3, the output ports P2 of each of the three superheated steam generation units 100A, 100B, and 100C are connected to a single superheated steam discharge port P3, and the superheated steam generated by each of the superheated steam generation units 100A, 100B, and 100C is combined and discharged. A temperature sensor 7 for controlling the temperature of the superheated steam is provided at or near the superheated steam discharge port P3. 【0033】 Furthermore, in each of the superheated steam generation units 100A, 100B, and 100C of this embodiment, as shown in Figures 1 and 2, the insulating material 8 is filled between the first preheating conductor pipe 31 and the first superheating conductor pipe 41, between the first superheating conductor pipe 41 and the second superheating conductor pipe 42, and between the second superheating conductor pipe 42 and the second preheating conductor pipe 32. This insulating material 8 is also filled in the gaps between the wound portions of each preheating conductor pipe 31, 32, and in the gaps between the wound portions of each superheating conductor pipe 41, 42. In this embodiment, a casing 9 is provided on the outer circumference of the first preheating conductor pipe 31, and the insulating material 8 is provided between the first preheating conductor pipe 31 and the casing 9. In addition, the insulating material 8 may be filled between the leg core portions 21a, 22a of the closed magnetic circuit core 2 and the second preheating conductor pipe 32. 【0034】 In the superheated steam generator 100 of this embodiment, when AC voltages of different phases are applied to each superheated steam generation unit 100A, 100B, and 100C, AC current flows through the first and second preheating conductor tubes 31 and 32 in each superheated steam generation unit, and magnetic flux flows through the leg cores 21 to 23. This magnetic flux causes a short-circuit current to flow through the first superheating conductor tube 41, the second superheating conductor tube 42, and the connecting tube elements 43 and 44, causing the superheating conductor tube 4 to generate Joule heat. In addition, the first and second preheating conductor tubes 31 and 32 generate Joule heat through current flow when an AC voltage is applied, and are also heated by heat transfer from the superheating conductor tube 4. Furthermore, in the second preheating conductor tube 32, a short-circuit current flows through the short-circuit section 32X, causing it to heat to a higher temperature than the rest of the second preheating conductor tube 32. 【0035】 As a result, as shown in Figure 3, water introduced from the introduction port P1 of the first preheating conductor pipe 31 flows through the first and second preheating conductor pipes 31 and 32, where it is heated by the first and second preheating conductor pipes 31 and 32 to become high-temperature water or saturated steam. Furthermore, just before flowing into the superheating conductor pipe 4, it is further heated by the short-circuit section 32X of the second preheating conductor pipe 32. Subsequently, the high-temperature water or saturated steam that flows from the second preheating conductor pipe 32 into the superheating conductor pipe 4 is heated by the superheating conductor pipe 4 to become superheated steam, which is then discharged from the outlet port P2, and after merging, is discharged from the superheated steam discharge port P3. 【0036】 <2. Effects of this embodiment> With the superheated steam generator 100 configured in this way, superheated steam is generated by applying AC voltages of different phases to the three superheated steam generation units 100A, 100B, and 100C. Therefore, the superheated steam generation capacity of the superheated steam generator 100 using a three-phase AC power supply can be improved. 【0037】 Furthermore, by using a first preheating conductor tube 31 and a second preheating conductor tube 32 as primary coils, and by providing a superheating conductor tube 4, which is a secondary coil, 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 heated by current, and are also heated by utilizing the heat dissipation from the superheating conductor tube 4. This reduces the heat dissipation from the superheating conductor tube 4 to the outside of the device, thereby increasing thermal efficiency. 【0038】 In particular, in this embodiment, since the second preheating conductor tube 32 has a short-circuit section 32X that is short-circuited in the spiral axial direction, the preheated water or saturated steam flowing into the superheating conductor tube 4 can be further heated by Joule heating due to the short-circuit current. As a result, the effect of cooling the superheating conductor tube 4 by the water or steam introduced from the introduction port P1 is reduced, and the time required to heat the superheated steam to the desired temperature can be shortened. In addition, in response to temperature changes of superheated steam due to changes in the amount of water, the superheated steam can be heated to the desired temperature regardless of changes in the amount of water. 【0039】 Here, the first preheating conductor tube 31 and the second preheating conductor tube 32 that form the primary coil can have their heat generation ratio, heat transfer area ratio to the fluid, and fluid velocity ratio adjusted by setting the number of turns, current-carrying cross-sectional area of ​​the conductor tube, and flow hole diameter of the conductor tube. 【0040】 Furthermore, the first preheating conductor pipe 31, the second preheating conductor pipe 32, and the superheating conductor pipe 4 are connected in series in that order. Water or steam is introduced from the introduction port P1 provided in the first preheating conductor pipe 31, and superheated steam is discharged from the outlet port P2 provided in the superheating conductor pipe 4 via the second preheating conductor pipe 32, thus simplifying and miniaturizing the superheating steam generator 100. Here, since the temperature of the water or saturated steam flowing into the superheating conductor pipe 4 is raised to a high temperature by the short-circuit section 32X, it becomes possible to shorten the length of the superheating conductor pipe 4, which also makes it possible to miniaturize the superheating steam generator 100. 【0041】 Furthermore, since the superheated conductor tube 4 is composed of a first superheated conductor tube 41, a second superheated conductor tube 42, and connecting tube elements 43 and 44, there is no need to provide electrical connection members separately from the conductor tube, and a short circuit can be formed by the configuration of the conductor tube itself. In addition, the connecting tube elements 43 and 44 are configured to connect one axial end of each superheated conductor tube 41 and 42 and the other axial ends of each, thus simplifying the connection structure for forming a short circuit. Moreover, since the superheated conductor tube 4 has a first superheated conductor tube 41 and a second superheated conductor tube 42, the contact area with the fluid (heat exchange area) can be increased, and the heating efficiency of the fluid can be improved. 【0042】 By making the superheated conductor tube 4 a secondary coil with multiple turns, the excitation current can be reduced and the leakage impedance can be decreased. This reduces the cross-sectional area of ​​the closed magnetic circuit core 2, thereby reducing the amount of core used, lowering iron loss, and improving thermal efficiency. In addition, by making the closed magnetic circuit core 2 a multi-stage shape, the surface area of ​​the core is increased, which enhances the cooling effect. 【0043】 <3. Modified Embodiments of the Invention> However, the present invention is not limited to the embodiments described above. For example, in the above embodiment, the first and second preheating conductor tubes 31 and 32 were each single-layer wound, but at least one of the first and second preheating conductor tubes 31 and 32 may be double-layer wound or more. 【0044】 Furthermore, in the above embodiment, the winding directions of the first superheated conductor tube 41 and the second superheated conductor tube 42 were opposite to each other, but the winding directions of the first superheated conductor tube 41 and the second superheated conductor tube 42 may be the same. In this case, one axial end of the first superheated conductor tube 41 and the other axial end of the second superheated conductor tube 42 are connected by a connecting pipe element 43, and the other axial end of the first superheated conductor tube 41 and one axial end of the second superheated conductor tube 42 are connected by a connecting pipe element 44. 【0045】 Furthermore, although the superheated conductor tube 4 in the above embodiment had a double-tube structure, it may also have four or more even-numbered tube elements. In this case, every two tube elements are connected by a connecting tube element. For example, it is conceivable to have a configuration in which multiple superheated conductor tubes 4 of the above embodiment are arranged concentrically. 【0046】 In the above embodiment, three outlet ports P2 are connected to one superheated steam discharge port P3, but it is also possible to discharge superheated steam independently from the three outlet ports P2 without providing a superheated steam discharge port P3. 【0047】 In the above embodiment, an apparatus for heating water or steam as the fluid was described, but it may also be used to heat other liquids or gases. 【0048】 Furthermore, it goes without saying that the present invention is not limited to the embodiments described above, and various modifications are possible without departing from its spirit. [Explanation of Symbols] 【0049】 100...Superheated steam generator 2. Closed magnetic circuit core 21, 22, 23... Leg iron core 3. Preheating conductor tube 31. First preheating conductor tube 32...Second preheating conductor tube 32X...Short circuit 4. Superheated conductor tubes 41...First superheated conductor tube 42...Second superheated conductor tube 43, 44... Connecting pipe elements P1... Introduction port P2... Derivation port 8. Insulation

Claims

[Claim 1] A superheated steam generator that generates superheated steam by heating a conductive tube by electromagnetic induction and heating the water flowing through the conductive tube, This system uses three leg cores in a three-phase closed magnetic circuit core to form three superheated steam generation units, and generates superheated steam by applying AC voltages of different phases to these three superheated steam generation units. Each of the aforementioned superheated steam generation units is: A primary coil to which an AC voltage is applied, comprising a spiral preheating conductor tube arranged around the leg core, It comprises a secondary coil through which an induced current flows, and a spiral-shaped superheated conductor tube arranged around the leg iron core, The preheating conductor tube has a first preheating conductor tube and a second preheating conductor tube arranged concentrically around the leg iron core, The aforementioned conductor tubes are arranged in the order of the second preheating conductor tube, the superheating 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, and the superheating conductor tube. The second preheating conductor tube has a short-circuit section that is short-circuited in the spiral axial direction, Water or steam is introduced from an inlet port provided in the first preheating conductor tube, and superheated steam is discharged from an outlet port provided in the superheating conductor tube via the second preheating conductor tube. The introduction port is provided at one axial end of the first preheating conductor tube. The outlet port is provided at the other axial end of the superheated conductor tube. The axial end of the second preheating conductor tube and the axial end of the superheating conductor tube are connected, The short-circuit portion is a superheated steam generator provided on one axial end side of the second preheating conductor tube. [Claim 2] The superheated steam generator according to claim 1, wherein the superheated conductor tube comprises a first superheated conductor tube and a second superheated conductor tube arranged concentrically around the closed magnetic circuit core and wound spirally in opposite directions, and a connecting tube element that fluidly connects the axial ends of the first superheated conductor tube and the axial ends of the second superheated conductor tube and short-circuits them.