JP2021034294A - Superheated steam producing device - Google Patents

Abstract

To improve heat efficiency of a superheated steam producing device, and achieve a simplification and a miniaturization.SOLUTION: A superheated steam producing device 100 that heats water flowing in a conductive pipe by generating the heat of the conductive pipe by an electromagnetic induction to generate a superheated steam, comprises: a closed magnetic circuit iron core 2; a first conductive pipe 31 and a second conductive pipe 32, which are a primary coil to which an AC voltage is applied, and which are arranged in concentric around the circumference of the closed magnetic circuit iron core; and a third conductive pipe 4, which is a secondary coil in which an induction current flows, and is arranged at the circumference of the closed magnetic circuit iron core 2. Each conductive pipe is arranged in the second conductive pipe 32, the third conductive pipe 4, and the first conductive pipe 31 from an inside of a radial direction in this order, and is connected in serial in order of the first conductive pipe 31, the second conductive pipe 32, and the third conductive pipe 4. By introducing water or steam from an introduction port P1 provided to the first conductive pipe 31, a superheated steam is introduced from an introduction port P2 provided to the third conductive pipe 4 via the second conductive pipe 32.SELECTED DRAWING: Figure 1

Description

The present invention relates to a superheated steam generator.

As a conventional superheated steam generator, as shown in Patent Document 1, a cylindrical iron core, a heating conductor tube arranged around the cylindrical iron core, and an induction coil that generates magnetic flux inside the cylindrical iron core. It is conceivable that an induced current is passed through the heated conductor tube to heat the fluid to be heated flowing inside the heated conductor tube.

In this superheated steam generator, the first radial direction connecting the cylindrical outer magnetic circuit forming portion provided on the radial outer side of the cylindrical iron core and the axial end portion of the cylindrical iron core and the outer magnetic circuit forming portion. It includes a closed magnetic circuit core element having a magnetic circuit forming portion, a cylindrical iron core, and a second radial magnetic path forming portion connecting the other end in the axial direction of the outer magnetic path forming portion.

Further, the first radial magnetic path forming portion and the second radial magnetic path forming portion are provided with a first flow path forming portion for forming a first flow path through which the fluid to be heated flowing into the heated conductor tube flows. A second flow path through which the fluid to be heated flowing into the heated conductor tube flows is formed in the second radial magnetic circuit path forming portion. Further, the induction coil has an outer hollow coil element and an inner hollow coil element formed of a hollow conductor tube through which a fluid to be heated flowing into the heated conductor tube flows, and a solid coil element composed of a solid conducting wire.

However, in the above-mentioned superheated steam generator, the fluid to be heated flowing into the heated conductor pipe flows through the first flow path, the second flow path, the outer hollow coil element, the inner hollow coil element, and the connecting pipe connecting them. This makes the device configuration complicated. Further, the structure in which the induction coil has a solid coil element in addition to the hollow coil element complicates the device configuration.

Japanese Unexamined Patent Publication No. 2016-213074

Therefore, the present invention has been made to solve the above problems, and its main object is to improve the thermal efficiency and to enable simplification and miniaturization of the superheated steam generator.

That is, the superheated steam generator according to the present invention is a superheated steam generator that generates superheated steam by heating a conductor tube by electromagnetic induction and heating the steam flowing through the conductor tube to generate superheated steam. It is a primary coil to which a voltage is applied, and is a spiral first conductor tube and a second conductor tube concentrically arranged around the closed magnetic path iron core, and a secondary coil through which an induced current flows. A spiral third conductor tube is provided around the iron core, and each conductor tube is arranged in the order of the first conductor tube, the third conductor tube, and the second conductor tube from the inside in the radial direction. , The first conductor tube, the second conductor tube, and the third conductor tube are connected in series in this order, and water or water vapor is introduced from the introduction port provided in the first conductor tube to introduce the second conductor tube. It is characterized in that superheated steam is led out from a lead-out port provided in the third conductor tube via a conductor tube.

According to such a superheated steam generator, a first conductor tube and a second conductor tube are used as the primary coil, and a third conductor which is a secondary coil between the first conductor tube and the second conductor tube is used. Since the tubes are provided, the first conductor tube and the second conductor tube are energized and heated, and at the same time, they are heated by utilizing the heat radiation of the third conductor tube, so that heat is dissipated from the third conductor tube to the outside of the device. It can be reduced and the thermal efficiency can be increased.
Further, the first conductor tube, the second conductor tube, and the third conductor tube are connected in series in this order, water or water vapor is introduced from the introduction port provided in the first conductor tube, and the water or steam is introduced through the second conductor tube. Since the superheated steam is derived from the outlet port provided in the third conductor tube, the superheated steam generator can be simplified and downsized.
Further, the first conductor tube and the second conductor tube forming the primary coil have a heat generation ratio and a heat transfer area ratio to the fluid, depending on the number of turns, the current-carrying cross-sectional area of the conductor tube, and the flow hole diameter of the conductor tube. The flow velocity ratio of the fluid can be adjusted.

In order to safely realize the heat dissipation of the third conductor tube to the outside of the apparatus and the heating of the first conductor tube and the second conductor tube by the heat dissipation of the third conductor tube, the first conductor tube and the third conductor tube are used. It is desirable that a heat insulating material is filled between the pipe and the second conductor pipe and the third conductor pipe.
In this configuration, depending on the thickness of the heat insulating material between the first conductor pipe and the third conductor pipe and the thickness of the heat insulating material between the second conductor pipe and the third conductor pipe, the third conductor pipe can be used. The heat transfer ratio to the first conductor tube and the second conductor tube can be adjusted.

As a specific connection configuration of each pipe, the first conductor pipe and the second conductor pipe are single-layer wound, and the introduction port is formed at one end in the axial direction of the first conductor pipe. The other end in the axial direction of the first conductor pipe is connected to the other end in the axial direction of the second conductor pipe, and one end in the axial direction of the second conductor pipe is connected to one end in the axial direction of the third conductor pipe. It is possible that they are connected.
In this case, it is desirable that the AC power supply to which the AC voltage is applied is connected to one end in the axial direction of the first conductor tube and one end in the axial direction of the second conductor tube.
With this configuration, the power supply wiring can be easily routed.

The third conductor tube includes an inner tube element and an outer tube element that are spirally wound in opposite directions to each other, and axial one ends and axial end portions of the inner tube element and the outer tube element. It is desirable to have a connecting tube element that connects them fluidly and short-circuits them.
With this configuration, it is not necessary 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. Further, the connecting tube element has a configuration in which one end in the axial direction of each tube element is connected to each other and the other end in the axial direction is connected to each other, so that the connection structure for forming a short circuit can be simplified.

The closed magnetic circuit core has two rectangular annular core elements in which magnetic steel plates are laminated so that the width decreases from the outside to the inside, and the leg core portions of the two core elements are in close contact with each other. It is desirable that they are configured in combination. With this configuration, since the closed magnetic circuit core has a multi-stage shape, the surface area of the core can be increased and the cooling effect can be increased.

According to the present invention configured as described above, it is possible to improve the thermal efficiency and reduce the size of the superheated steam generator.

It is sectional drawing which shows typically the structure of the fluid heating apparatus which concerns on one Embodiment of this invention. It is a figure which shows typically the arrangement in the radial direction of the fluid heating apparatus of the same embodiment. It is a figure which shows the structure of the closed magnetic circuit iron core of the same embodiment. It is a side view which shows typically the structure of the 3rd conductor tube of the same embodiment. It is a figure which shows the coil connection and the fluid flow of the same embodiment.

Hereinafter, an embodiment of the superheated steam generator according to the present invention will be described with reference to the drawings.

<1. Device configuration>
The superheated steam generator 100 according to the present embodiment generates superheated steam by heating a conductor pipe to generate heat by electromagnetic induction and heating water flowing through the conductor pipe. In addition, the superheated steam generator 100 may be, for example, one that heats saturated steam generated outside to generate superheated steam.

Specifically, as shown in FIGS. 1 and 2, the superheated steam generator 100 is a closed magnetic circuit core 2 and a primary coil to which an AC voltage is applied, and is arranged concentrically around the closed magnetic circuit core 2. A spiral (coil-shaped) first conductor tube 31 and a second conductor tube 32, and a secondary coil through which an induced current flows, and a spiral (coil-shaped) third conductor arranged around a closed magnetic path iron core 2. It is provided with a tube 4.

As shown in FIG. 3, the closed magnetic circuit core 2 has two rectangular annular core elements 21 and 22, and the leg cores 21a and 22a of the two core elements 21 and 22 are combined so as to be in close contact with each other. It is composed of. The two core elements 21 and 22 have the same shape as each other, and each of the core elements 21 and 22 is a rectangular ring formed by laminating magnetic steel plates so that the width decreases from the outside to the inside. It is a wound steel core transformed into. A grain-oriented electrical steel sheet is used as the magnetic steel sheet. By using these iron core elements 21 and 22, the cross-sectional shape of the closed magnetic circuit core 2 becomes a multi-stage shape.

The first conductor tube 31 and the second conductor tube 32 are each single-layer wound, and the second conductor tube 32 is arranged on the inner side in the radial direction, and the first conductor tube 31 is arranged on the outer side in the radial direction. Further, an introduction port P1 is provided at one end in the axial direction of the first conductor tube 31, and the other end in the axial direction of the first conductor tube 31 is connected to the other end in the axial direction of the second conductor tube 32. .. A flow rate adjusting valve 5 for adjusting the flow rate of water flowing into the first conductor pipe is provided at or near the introduction port P1. Further, the AC power supply (not shown) to which the AC voltage is applied is a power supply terminal 61 provided at one end in the axial direction of the first conductor tube 31 and a power supply terminal 62 provided at one end in the axial direction of the second conductor tube 32. It is connected to the.

The first conductor tube 31 and the second conductor tube 32 are configured so that the wound portions of the conductor tubes 31 and 32 are not short-circuited with each other. The winding portion is a spiral winding portion. Specifically, in the first conductor tube 31, the wound portions of the first conductor tube 31 are short-circuited with each other by performing an insulating treatment such as winding an insulator (not shown) on the outer peripheral surface thereof. It is configured not to. Further, in the second conductor tube 32, the winding portions of the second conductor tube 32 are wound so as not to be short-circuited with each other by winding with a gap so that the outer peripheral surfaces of the winding portions do not come into contact with each other. Has been done.

The third conductor pipe 4 is arranged between the first conductor pipe 31 and the second conductor pipe 32. Further, one end of the third conductor pipe 4 in the axial direction is connected to one end of the second conductor pipe 32, and a lead-out port P2 is provided at the other end of the third conductor pipe 4 in the axial direction. A temperature sensor 7 for controlling the temperature of superheated steam is provided at or near the lead-out port P2. With such a configuration, the conductor tubes 31, 32, and 4 are arranged in the order of the second conductor tube 32, the third conductor tube 4, and the first conductor tube 31 from the inside in the radial direction, and the first conductor tube 31, The second conductor tube 32 and the third conductor tube 4 are connected in series in this order.

Then, as shown in FIG. 4, the third conductor tube 4 has the inner tube element 41 and the outer tube element 42 spirally wound in opposite directions to each other, and the inner tube element 41 and the outer tube element 42 in the axial direction. It has connecting pipe elements 43 and 44 that fluidly connect one end to each other and the other end in the axial direction and short-circuit them. The inner tube element 41 and the outer tube element 42 are formed with a radial gap when viewed from the axial direction. Further, one end of the second conductor pipe 32 in the axial direction is connected to one connecting pipe element 43, and the other connecting pipe element 44 is provided with a lead-out port P2. With this configuration, the fluid flowing in from the connecting pipe element 43 is branched into the inner pipe element 41 and the outer pipe element 42 by the connecting pipe element 43, and the fluid flowing through the inner pipe element 41 and the outer pipe element 42 is connected. It merges at the tube element 44 and flows out from the lead-out port P2.

Further, the third conductor tube 4 connected in this way has a configuration in which the inner tube element 41 and the outer tube element 42 are electrically connected in parallel by the connecting tube elements 43 and 44. Then, the magnetic flux generated by the first conductor tube 31 and the second conductor tube 32, which are the primary coils, forms a closed circuit by the inner tube element 41 and the outer tube element 42, and a short-circuit current flows. That is, a short-circuit current flows through the inner tube element 41 from one end in the axial direction toward the other end in the axial direction, and a short-circuit current flows through the outer tube element 42 from the other end in the axial direction toward the other end in the axial direction. It flows.

Further, in the superheated steam generator 100 of the present embodiment, as shown in FIGS. 1 and 2, between the first conductor pipe 31 and the third conductor pipe 4 and between the second conductor pipe 32 and the third conductor pipe 4. The heat insulating material 8 is filled between the two. The heat insulating material 8 is also filled in the gap between the wound portions of the second conductor pipe 32, and is also filled between the inner pipe element 41 and the outer pipe element 42 of the third conductor pipe 4. In the present embodiment, the casing 9 is provided on the outer periphery of the first conductor pipe 31, and the heat insulating material 8 is provided between the first conductor pipe 31 and the casing 9. In addition, the heat insulating material 8 may be filled between the leg iron cores 21a and 22a of the closed magnetic circuit core 2 and the second conductor tube 32.

In the superheated steam generator 100 of the present embodiment configured in this way, an AC voltage is applied to the power supply terminal 61 provided on the first conductor tube 31 and the power supply terminal 62 provided on the second conductor tube 32 by an AC power supply. As a result, an alternating current flows through the first conductor tube 31 and the second conductor tube 32, and a magnetic flux flows through the closed magnetic circuit core 2. Due to the magnetic flux, a short-circuit current flows through the inner tube element 41, the outer tube element 42, and the connecting tube elements 43, 44 of the third conductor tube 4, and the third conductor tube 4 generates Joule heat. Further, the first conductor tube 31 and the second conductor tube 32 generate Joule heat by energization when an AC voltage is applied, and are also heated by heat transfer from the third conductor tube 4.

As a result, as shown in FIG. 5, the water introduced from the introduction port P1 of the first conductor pipe 31 flows through the first conductor pipe 31 and the second conductor pipe 32, so that the first conductor pipe 31 and the second conductor pipe 31 and the second conductor pipe 32 flow. It is heated by the conductor tube 32 to become hot water or saturated steam. After that, the high-temperature water or saturated steam flowing from the second conductor pipe 32 into the third conductor pipe 4 is heated by the third conductor pipe 4 to become superheated steam, and is led out from the outlet port P2.

<2. Effect of this embodiment>
According to the superheated steam generator 100 configured in this way, the first conductor tube 31 and the second conductor tube 32 are used as the primary coil, and two are between the first conductor tube 31 and the second conductor tube 32. Since the third conductor tube 4 which is the next coil is provided, the first conductor tube 31 and the second conductor tube 32 are energized and heated, and at the same time, they are heated by utilizing the heat radiation of the third conductor tube 4, so that the first conductor tube 31 and the second conductor tube 32 are heated. 3 The heat radiation from the conductor tube 4 to the outside of the device can be reduced, and the thermal efficiency can be improved. Further, the first conductor tube 31, the second conductor tube 32, and the third conductor tube 4 are connected in series in this order, and water or water vapor is introduced from the introduction port P1 provided in the first conductor tube 31 to introduce the second conductor. Since the superheated steam is led out from the lead-out port P2 provided in the third conductor tube 4 via the tube 32, the superheated steam generator 100 can be simplified and downsized. Here, in the first conductor tube 31 and the second conductor tube 32 forming the primary coil, the heat generation ratio and the heat transfer to the fluid are set by setting the number of turns, the current-carrying cross-sectional area of the conductor tube, and the flow hole diameter of the conductor tube. The area ratio and fluid flow velocity ratio can be adjusted.

Since the heat insulating material 8 is filled between the first conductor tube 31 and the third conductor tube 4 and between the second conductor tube 32 and the third conductor tube 4, the heat radiation of the third conductor tube 4 is outside the apparatus. It is possible to safely realize heating of the first conductor tube 31 and the second conductor tube 32 by leaking to the water and radiating heat from the third conductor tube 4. Here, the thickness of the heat insulating material 8 between the first conductor pipe 31 and the third conductor pipe 4 and the thickness of the heat insulating material 8 between the second conductor pipe 32 and the third conductor pipe 4 are used to determine the third. The heat transfer ratio from the conductor tube 4 to the first conductor tube 31 and the second conductor tube 32 can be adjusted.

Further, the spirally wound third conductor tube 4 has an inner tube element 41, an outer tube element 42, and connecting tube elements 43, 44 for fluidly connecting them, and the connecting tube elements 43, 44 are inner tubes. Since the element 41 and the outer tube element 42 are short-circuited, it is not necessary to provide an electrical connection member separately from the third conductor tube 4, and a short-circuit circuit can be formed by the configuration of the third conductor tube 4 itself. Further, since the third conductor tube 4 has the inner tube element 41 and the outer tube element 42, the contact area (heat exchange area) with the fluid can be increased, and the heating efficiency of the fluid can be improved.

Further, the winding directions of the inner tube element 41 and the outer tube element 42 are opposite to each other, and one end in the axial direction and the other end in the axial direction of the inner tube element 41 and the outer tube element 42 are connected to each other. Since they are connected by 43 and 44, the connection structure for forming a short circuit can be simplified.

By using the third conductor tube 4 as a secondary coil wound a plurality of times, the exciting current can be reduced and the leakage impedance can be reduced. Therefore, the cross-sectional area of the closed magnetic circuit core 2 is reduced to reduce the amount of iron core used, and iron. Loss can be reduced and thermal efficiency can be increased. Further, since the closed magnetic circuit core 2 has a multi-stage shape to increase the surface area of the iron core, the cooling effect can be increased.

Further, since the AC power supply to which the AC voltage is applied is connected to one end in the axial direction of the first conductor tube 31 and one end in the axial direction of the second conductor tube 32, the power supply wiring can be easily routed. ..

<3. Modified Embodiment of the present invention>
The present invention is not limited to the above embodiment.
For example, in the above embodiment, the first conductor tube 31 and the second conductor tube 32 are each wound in a single layer, but at least one of the first conductor tube 31 or the second conductor tube 32 is wound in two layers or more. It may be the one.

Further, in the above-described embodiment, the winding directions of the inner tube element 41 and the outer tube element 42 are opposite to each other, but the winding directions of the inner tube element 41 and the outer tube element 42 may be the same. .. In this case, one end in the axial direction of the inner tube element 41 and the other end in the axial direction of the outer tube element 42 are connected by the connecting tube element 43, and the other end in the axial direction of the inner tube element 41 and the outer tube element 42. Is configured to be connected to one end in the axial direction by a connecting pipe element 44.

Further, although the third conductor pipe 4 of the above embodiment has a double pipe structure, it may have a quadruple pipe or a pipe element having an even weight of more than that. In this case, each of the two pipe elements is connected by a connecting pipe element. For example, it is conceivable that a plurality of the third conductor pipes 4 of the above embodiment are arranged concentrically.

In addition, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

100 ... Superheated steam generator 2 ... Closed magnetic path iron cores 21, 22 ... Iron core elements 21a, 22a ... Leg iron core 31 ... First conductor tube 32 ... Second conductor tube 4.・ ・ Third conductor pipe 41 ・ ・ ・ Inner pipe element 42 ・ ・ ・ Outer pipe element 43, 44 ・ ・ ・ Connection pipe element P1 ・ ・ ・ Introduction port P2 ・ ・ ・ Outlet port 8 ・ ・ ・ Insulation material

Claims (5)

A superheated steam generator that generates superheated steam by heating a conductor tube to generate heat by electromagnetic induction and heating the water flowing through the conductor tube.
With a closed magnetic circuit core
A primary coil to which an AC voltage is applied, and a spiral first conductor tube and a second conductor tube concentrically arranged around the closed magnetic circuit core.
It is a secondary coil through which an induced current flows, and includes a spiral third conductor tube arranged around the closed magnetic circuit core.
The conductor tubes are arranged in the order of the second conductor tube, the third conductor tube, and the first conductor tube from the inside in the radial direction, and the first conductor tube, the second conductor tube, and the third conductor tube are arranged in this order. Are connected in series in the order of
Superheated steam generation in which water or steam is introduced from the introduction port provided in the first conductor pipe and superheated steam is led out from the outlet port provided in the third conductor pipe via the second conductor pipe. apparatus. The superheated steam generator according to claim 1, wherein a heat insulating material is filled between the first conductor pipe and the third conductor pipe, and between the second conductor pipe and the third conductor pipe. The first conductor tube and the second conductor tube are single-layer wound.
The introduction port is formed at one end in the axial direction of the first conductor tube.
The other end in the axial direction of the first conductor tube is connected to the other end in the axial direction of the second conductor tube.
One end of the second conductor tube in the axial direction is connected to one end of the third conductor tube in the axial direction.
The superheated steam generator according to claim 1 or 2, wherein the AC power source to which the AC voltage is applied is connected to one end in the axial direction of the first conductor tube and one end in the axial direction of the second conductor tube. The third conductor tube includes an inner tube element and an outer tube element that are spirally wound in opposite directions to each other, and axial one ends and axial end portions of the inner tube element and the outer tube element. The superheated steam generator according to any one of claims 1 to 3, further comprising a connecting pipe element that fluidly connects and short-circuits them. The closed magnetic circuit core has two rectangular annular core elements in which magnetic steel plates are laminated so that the width decreases from the outside to the inside, and the leg core portions of the two core elements are in close contact with each other. The superheated steam generator according to any one of claims 1 to 4, which is configured in combination.