Superheated steam generator

Abstract

To enable simplification and miniaturization of a super heated steam generator while increasing thermal efficiency.SOLUTION: A superheated steam generator comprises: a closed magnetic path core 2; a spiral preheat conductor pipe 3 serving as a primary coil to which an alternative current voltage is applied, and disposed around the closed magnetic path core 2; and a spiral superheat conductor pipe 4 serving as a secondary coil through which an induction current flows, and disposed around the closed magnetic path core 2; the preheat conductor pipe 3 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 2, the superheat conductor pipe 4 comprising a first superheat conductor tube 41 and a second superheat conductor tube 42 that are concentrically disposed around the closed magnetic path core 2 and that are spirally wound in mutually opposite directions, for conductor tubes 31 to 33, and 41, 42, from the inside in a radial direction, the second preheat conductor tube 32, the second superheat conductor tube 42, the third preheat conductor tube 33, the first superheat conductor tube 41, and the first preheat conductor tube 31 being arranged in this order.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] As a conventional superheated steam generation device, as shown in Patent Document 1, 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 generation device, the first conductor tube and the second conductor tube are heated by being energized, and are also heated by utilizing the heat radiation of the third conductor tube. Therefore, heat radiation from the third conductor tube to the outside of the device can be reduced, and the thermal efficiency can be improved.

[0003] And in this superheated steam generation device, 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 generation device, although the heat radiation on the radially outer side of the third conductor tube can be utilized for heating the first conductor tube, and the heat radiation on the radially inner side of the third conductor tube can be utilized for heating the second conductor tube, the heat radiation 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 its main object is to effectively utilize the heat dissipation of the superheated conductor tube to improve the thermal efficiency and enable simplification and miniaturization of the superheated steam generator.

Means for Solving the Problems

[0007] That is, the superheated steam generator according to the present invention is a superheated steam generator that generates heat in a conductor tube by electromagnetic induction to heat water or steam flowing through the conductor tube to generate superheated steam, and includes a closed magnetic circuit core, a primary coil to which an AC voltage is applied, a spiral preheating conductor tube disposed around the closed magnetic circuit core, 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 has a first superheated conductor tube and a second superheated conductor tube that are concentrically disposed around the closed magnetic circuit core and spirally wound in opposite directions to each other, and a connection tube 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 the first preheating conductor tube, the second preheating conductor tube, the third preheating conductor tube, and the superheated conductor tube are connected in series in this order. 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 generation device, 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, 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 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, the first preheating conductor tube, the second preheating conductor tube, the third preheating conductor tube, and the superheating conductor tube are connected in series in this order. 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 through the second preheating conductor tube and the third preheating conductor tube. Therefore, the superheated steam generation 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 one ends of the respective pipe elements to each other and the axial other ends to each other, and the connection structure for forming the short-circuit circuit can be simplified.

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

[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 outlet port in the first preheating heat conductor pipe.

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

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

Advantages of the Invention

[0013] According to the present invention configured as described above, it is possible to improve the thermal efficiency and miniaturize the superheated steam generation device.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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 generates superheated steam by heating water flowing through a conductor tube by electromagnetic induction. In addition, as the superheated steam generation device 100, for example, it may be one that heats saturated steam generated externally to generate superheated steam.

[0017] Specifically, as shown in FIGS. 1 and 2, the superheated steam generation device 100 includes a closed magnetic circuit core 2, a primary coil to which an AC voltage is applied, a spiral (coil-shaped) preheating conductor tube 3 disposed around the closed magnetic circuit core 2, a secondary coil through which an induced current flows, and a spiral (coil-shaped) superheat conductor tube 4 disposed around the closed magnetic circuit core 2.

[0018] As shown particularly in FIG. 3, the closed magnetic circuit core 2 has two rectangular annular core elements 21 and 22, and the leg core portions 21a and 22a of the two core elements 21 and 22 are combined so as to be in close contact with each other. The two core elements 21 and 22 have the same shape as each other, and each core element 21, 22 is a wound core deformed into a rectangular ring shape, which is formed by laminating magnetic steel sheets so that the width decreases from the outside to the inside. Note that a directional electromagnetic steel sheet is used for the magnetic steel sheet. By using these core elements 21 and 22, the cross-sectional shape of the closed magnetic circuit core 2 becomes a multi-step shape.

[0019] 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.

[0020] The first to third preheating conductor tubes 31, 32, and 33 are each single-layer wound, the first preheating conductor tube 31 is arranged on the outermost side in the radial direction, the second preheating conductor tube 32 is arranged on the innermost side in the radial direction, and the third preheating conductor tube 33 is arranged between the first preheating conductor tube 31 and the second preheating conductor tube 32.

[0021] An introduction port P1 is provided at 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.

[0022] Note that 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. Further, an AC power source (not shown) for applying an AC voltage is connected to a power supply terminal 61 provided at one axial end of the first preheating conductor tube 31 and a power supply terminal 62 provided at the other axial end of the third preheating conductor tube 33.

[0023] The first to third preheating conductor tubes 31, 32, and 33 are configured such that the wound portions of the respective conductor tubes 31, 32, and 33 do not short-circuit with 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 with each other. Alternatively, 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 with each other by performing insulation processing such as winding an insulator (not shown) around the outer circumferential surface thereof.

[0024] As shown in FIG. 4, 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 and 44 that fluidly connect and short-circuit one axial end portion and the other axial end portion of the first superheating conductor tube 41 and the second superheating conductor tube 42. A gap is formed in the radial direction when viewed from the axial direction between the first superheating conductor tube 41 and the second superheating conductor tube 42.

[0025] The first superheating conductor tube 41 and the second superheating conductor tube 42 are disposed between the first preheating conductor tube 31 and the second preheating conductor tube 32, and a third preheating conductor tube 33 is disposed between the first superheating conductor tube 41 and the second superheating conductor tube 42. Further, the other axial end portion of the superheating conductor tube 4 is connected to the other axial end portion of the third preheating conductor tube 33, and a lead-out port P2 is provided at one axial end portion of the superheating conductor tube 4. A temperature sensor 7 for controlling the temperature of the superheated steam is provided at or near the lead-out port P2.

[0026] With such a configuration, the respective 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.

[0027] On one of the connecting pipe elements 43, a lead-out port P2 is provided, and on the other connecting pipe element 44, the axially other end of the third preheating conductor pipe 33 is connected. With this configuration, the fluid flowing in from the other connecting pipe element 44 branches and flows through the first superheating conductor pipe 41 and the second superheating conductor pipe 42 by the connecting pipe element 44, and the fluid flowing through the first superheating conductor pipe 41 and the second superheating conductor pipe 42 merges at the connecting pipe element 43 and flows out from the lead-out port P2.

[0028] Also, the superheating conductor pipe 4 connected in this way has a configuration in which the first superheating conductor pipe 41 and the second superheating conductor pipe 42 are electrically connected in parallel by the connecting pipe elements 43 and 44. Then, a closed circuit is formed by the first superheating conductor pipe 41 and the second superheating conductor pipe 42 due to the magnetic flux generated by the first to third preheating conductor pipes 31, 32, and 33 which are primary coils, and a short-circuit current flows. That is, a short-circuit current flows from the axially one end to the axially other end in the first superheating conductor pipe 41, and a short-circuit current flows from the axially other end to the axially one end in the second superheating conductor pipe 42.

[0029] Also, in the superheated steam generation device 100 of the present embodiment, as shown in FIGS. 1 and 2, between the first preheating conductor pipe 31 and the first superheating conductor pipe 41, between the first superheating conductor pipe 41 and the third preheating conductor pipe 33, between the third preheating conductor pipe 33 and the second superheating conductor pipe 42, and between the second superheating conductor pipe 42 and the second preheating conductor pipe 32, a heat insulating material 8 is filled. This heat insulating material 8 is also filled in the gaps between the winding portions of each of the preheating conductor pipes 31 to 33, and is also filled in the gaps between the winding portions of each of the superheating conductor pipes 41 and 42. In the present embodiment, a casing 9 is provided on the outer periphery of the first preheating conductor pipe 31, and a heat insulating material 8 is provided between the first preheating conductor pipe 31 and the casing 9. In addition, the heat insulating material 8 may be filled between the leg core portions 21a and 22a of the closed magnetic circuit core 2 and the second preheating conductor pipe 32.

[0030] In the superheated steam generation device 100 of this embodiment configured as described above, by applying an alternating voltage to the power supply terminal 61 provided on the first preheating conductor tube 31 and the power supply terminal 62 provided on the third preheating conductor tube 33 with an AC power supply, an alternating current flows through the first to third preheating conductor tubes 31, 32, 33, and a magnetic flux flows through the closed magnetic circuit core 2. Due to the magnetic flux, a short-circuit current flows through the first superheating conductor tube 41, the second superheating conductor tube 42, and the connecting pipe elements 43, 44, causing the superheating conductor tube 4 to generate Joule heat. Further, the first to third preheating conductor tubes 31, 32, 33 generate Joule heat when energized by the application of an alternating voltage and are heated by heat transfer from the superheating conductor tube 4.

[0031] As a result, as shown in FIG. 5, 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, 33 and is heated by the first to third preheating conductor tubes 31, 32, 33 to become high-temperature water or saturated steam. Thereafter, 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 and is led out from the lead-out port P2.

[0032] <2. Effects of this Embodiment> According to the superheated steam generation device 100 configured as described above, 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. Therefore, the first preheating conductor tube 31 and the second preheating conductor tube 32 are heated by energization and are also heated by utilizing the heat radiation of the superheating conductor tube 4. Thus, heat radiation from the superheating conductor tube 4 to the outside of the device can be reduced, and the thermal efficiency can be increased.

[0033] In particular, in the present invention, the third preheating conductor tube 33 is provided as the primary coil, and the third preheating conductor tube 33 is provided between the first superheating conductor tube 41 and the second superheating conductor tube 42 that constitute the superheating conductor tube 4. Therefore, heat radiation between the first superheating conductor tube 41 and the second superheating conductor tube 42 is effectively utilized for heating, and the thermal efficiency can be further increased.

[0034] 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 current-carrying cross-sectional area of the conductor tube, and the current-carrying hole diameter of the conductor tube.

[0035] Further, the first preheating conductor tube 31, the second preheating conductor tube 32, the third preheating conductor tube 33, and the superheating conductor tube 4 are connected in series in this order. 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 generation device 100 can be simplified and miniaturized.

[0036] Furthermore, since the superheating conductor tube 4 is composed of a first superheating conductor tube 41, a second superheating conductor tube 42, and connection pipe elements 43 and 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 connection pipe elements 43 and 44 connect the axial direction one ends of the respective superheating conductor tubes 41 and 42 and connect the axial direction other ends, and the connection structure for forming the 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.

[0037] By making 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 closed magnetic circuit core 2 has a multi-stage shape and the surface area of the iron core is increased, the cooling effect can be enhanced.

[0038] <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, and 33 were each single-layer wound, but at least one of the first to third preheating conductor tubes 31, 32, and 33 may be wound in two or more layers.

[0039] 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 pipe 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 pipe element 44.

[0040] Furthermore, the superheating conductor tube 4 in the above embodiment had a double-tube structure, but it may have a quadruple tube or an even-numbered multi-tube element of four or more. In this case, each two tube elements are connected by a connecting pipe 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.

[0041] Needless to say, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit thereof.

Explanation of Reference Numerals

[0042] 100 ··· Superheated steam generator 2 ··· Closed magnetic circuit core 21, 22 ··· Core elements 21a, 22a ··· Leg core parts 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 ··· Connecting pipe elements P1 ··· Introduction port P2 ··· Derivation port 8 ··· Heat insulating material

Claims

1. A superheated steam generator that generates superheated steam by heating water or steam flowing through a conductor tube by causing the conductor tube to generate heat through electromagnetic induction, comprising: A closed magnetic circuit core; A primary coil to which an alternating voltage is applied, and a spiral preheating conductor tube disposed around the closed magnetic circuit core; A secondary coil through which an induced current flows, and a spiral superheating 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 superheating conductor tube includes a first superheating conductor tube and a second superheating conductor tube that are concentrically disposed around the closed magnetic circuit core and wound spirally in opposite directions, and a connection tube element that fluidly connects and short-circuits one axial end portion and the other axial end portion of the first superheating conductor tube and the second superheating conductor tube; Each of the conductor tubes is arranged in the order of the second preheating conductor tube, the second superheating conductor tube, the third preheating conductor tube, the first superheating conductor tube, and the first preheating conductor tube from the radially inner side, and the first preheating conductor tube, the second preheating conductor tube, the third preheating conductor tube, and the superheating conductor tube are connected in series in this order; A superheated steam generator that introduces water or steam from an introduction port provided in the first preheating conductor tube and discharges superheated steam from a discharge port provided in the superheating conductor tube through the second preheating conductor tube and the third preheating conductor tube.

2. The discharge port is formed at one axial end portion of the superheating conductor tube; The superheated steam generator according to claim 1, wherein water or steam is introduced into the third preheating conductor tube from one axial end portion on the same side as the discharge port.

3. The superheated steam generator according to claim 1 or 2, wherein the introduction port is formed at one axial end portion of the first preheating conductor tube on the same side as the discharge port.

4. The superheated steam generator according to any one of claims 1 to 3, wherein heat insulating materials are 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 portion 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 supply 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 generation device according to any one of claims 1 to 4.

Images